A nanocoating method for providing UV resistance to aramid materials

Abstract

The invention relates to a nanocoating method for providing UV resistance to aramid materials. By means of the method that is the subject of the invention, the surface of the aramid material is coated with Ce02, hexagonal boron nitride nanoparticles, and catechol / polyamine and hydroxyapatite structures. As a result of this coating, the resistance of the aramid material against UV radiation is increased.

Description

[0001] A NANOCOATING METHOD FOR PROVIDING UV RESISTANCE TO ARAMID MATERIALS

[0002] Technical Field

[0003] The invention relates to a coating method which provides protection of aramid materials against UV radiation. In said method, cerium(IV) oxide (CeO2) and hexagonal boron nitride (h-BN) nanoparticles are used. Owing to the Layer-by-Layer coating method used during coating, the surface of the aramid materials is coated in a homogeneous manner.

[0004] State of the Art

[0005] Aramid materials are a general term used for polymer structures which belong to the class of high-performance synthetic fibres and have high strength and heat resistance. Aramid materials are lightweight materials despite their high strength. It is also known that they have high resistance against fire, abrasion and chemical substances. Aramid materials are used in many different fields owing to these properties. One of the most well-known application areas is bullet-proof vests and ballistic protection equipment, and, in addition, aramid materials are also used in firefighter clothing and heat-resistant garments. In the aviation and space industry, aramid fibres are used in the production of lightweight but strong composite materials. In the automotive sector, aramid materials can be used in brake pads and clutch discs.

[0006] Despite advantages such as high durability which aramid materials possess, they also bring certain disadvantages. Firstly, their production costs are quite high. This arises from the raw materials and the complexity of the production process of aramid materials, and this causes the final products to be expensive. Secondly, aramid materials are sensitive to UV radiation. When they are exposed to sunlight for prolonged periods, the mechanical properties of the material deteriorate and weaken. UV radiation causes the polymer chains of aramid materials to break, leading to deterioration in their chemical structure. The breaking of said polymer chains causes a decrease in strength and durability values and weakens the mechanical properties of aramid materials. In addition, UV radiation causes the colour of aramid materials to fade and changes their physical appearance. To minimise these negative effects, aramid materials are generally coated with structures which exhibit a protective effect against UV radiation. To increase the UV resistance of aramid materials, the material surface is generally activated by abrasive pretreatments with acidic or basic solutions at high temperatures and pressures. As UV protective agents, titanium, zinc and cerium oxides or their ions are generally used. However, owing to the photocatalytic activities of these metal oxides, additional materials such as polydopamine (PDA), calcium, hydroxyapatite and silane compounds need to be added to the coating so that they do not damage the material. Owing to the use of abrasive structures and the need for additional materials, there are limitations in studies aimed at protecting aramid materials against UV radiation.

[0007] In the article in the state of the art, the aim is to protect aramid materials against UV radiation [1], In the article, titanium dioxide (TiO2) nanoparticles are synthesised using supercritical carbon dioxide (scCO2) to protect aramid materials against UV radiation. These nanoparticles are located on the material surface. In this way, UV radiation is prevented from damaging the material and the mechanical properties of the material are improved. However, the photocatalytic activity of TiO2nanoparticles may damage the material. In addition, coatings prepared by the sol-gel method are brittle and have low durability. Furthermore, the penetration of oxygen into the amorphous regions of semicrystalline polymer materials leads to photodegradation and this necessitates the modification of the regions in which photodegradation occurs.

[0008] In patent application number CN110804195A in the state of the art, a new method is described for applying UV protective coatings to aramid fibres. In this method, a selfassembled Layer-by-Layer nano-coating technique is applied using electrostatic and secondary attraction forces with TiO2nanoparticles. In addition, a catechol / polyamine (CPA) coating is used in the method to activate the fibre surface. However, although protection is provided against UVA (400-315 nm) and UVB (315-280 nm) wavelengths, the protection provided against UV radiation with UVC (100-280 nm) wavelengths remains insufficient. The limitations and inadequacies of the solutions in the existing technique, such as the inability of commonly used methods in the state of the art to sufficiently protect aramid materials from UV radiation, the chemicals used in the methods in the existing technique causing abrasion and loss of properties such as strength in aramid materials, the necessity of additional modifications on the material, and the inability to provide protection against all wavelengths in the UV spectrum, have made it necessary to develop an improvement in this field.

[0009] Summary and Aims of the Invention

[0010] The aim of the method that is the subject of the invention is to protect aramid materials against the wavelengths across the entire UV spectrum. The method that is the subject of the invention coats the surface of the aramid material with cerium(IV) oxide (CeO2), hexagonal boron nitride (h-BN) nanoparticles, catechol / polyamine (CPA) and hydroxyapatite structures, and by benefiting from the radical-scavenging property of the coatings, the photocatalytic effect is prevented or reduced.

[0011] The main aim of the invention is to provide a protection method which will protect aramid materials from all radiation in the UV spectrum. In the invention, cerium(IV) oxide (CeO2) (315-400 nm: UVA protection) and hexagonal boron nitride (h-BN) (280-315 nm 1100-280 nm: UVB / UVC protection) nanoparticles are used to provide effective protection covering the entire UV spectrum against strength losses occurring in aramid materials due to UV radiation. Thus, protection is provided against the entire UV spectrum. In addition, the radical-scavenging property of CPA coatings is used to prevent or reduce the possible photocatalytic effect of UV absorbents. This property is supported by hydroxyapatite, which is highly suitable for the design of UV protective materials that do not exhibit photocatalytic activity. Thus, double protection is provided at the material level against the photocatalytic effect. In this way, while protection against UV radiation is ensured, no significant reduction (loss) occurs in the physical and chemical properties of the aramid material.

[0012] Another aim of the invention is to increase the number of application areas of aramid materials. The method that is the subject of the invention eliminates the usage limitation of aramid materials. Owing to their weak UV resistance, even the slightest performance loss constitutes a major risk because it can disrupt the entire system. For this reason, aramid fibres cannot be used alone in the outer layer in a manner directly exposed to sunlight or artificial light. Hence, aramid fibres are used in inner layers in composite structures and / or in mixtures with other fibres. The invention significantly improves the performance of the aramid fibre under UV irradiation and eliminates its usage limitations. Another aim of the invention is to provide a sustainable UV protective system. The invention is compatible with the principles of green chemistry in terms of the development and application of nano coatings and is environmentally friendly. The invention offers an easy, simple, universal and sustainable method, since the modification is carried out at atmospheric pressure, at room temperature and with simple production tools. The components present in the nano coatings are potentially environmentally friendly compounds, are used at low concentrations, and thus provide a low-cost solution. In the invention, only water is used as a solvent, and energy consumption is low since there is no intermediate drying step in the Layer-by-Layer coating application. The invention also provides considerable benefit by preventing UV-induced premature degradation that may occur during use, enabling various materials or products, particularly aramid materials, to maintain their functional properties for a longer period. This contributes to extending product lifetime, reducing waste generation and providing a sustainable system not only in production but also in usage.

[0013] Description of the Figures

[0014] Figure 1: UV-Vis absorbance spectrum of 30 mM catechol and 30 / 10 mM CPA (catechol / TEPA) solutions (A: UV absorbance spectrum between 200-600 nm and B: UV absorbance spectrum between 300-600 nm).

[0015] Figure 2: Tensile strength and elongation values of aramid yarns (A: before UV ageing and B: after UV ageing) - (PA: untreated original para-aramid fibre, PA-UV: PA after 96 hours of UV ageing, CPA: coating performed for 1 day in a CPA solution prepared with 30 / 10 mM catechol / TEPA using ultrasonication in open air, dried at 100°C for 10 minutes at the end of 1 day, CPA-UV: CPA after 96 hours of UV ageing, CPACe: coating obtained by a total of 10 layers formed by 5 repetitions of the sequential pair CeO2(-) / CeO2(+) prepared at 1 g / L on top of a 1-day CPA coating, dried at 100°C for 10 minutes at the end of coating, CPACe-UV: CPACe after 96 hours of UV ageing).

[0016] Figure 3: SEM results of aramid yams (A: untreated para-aramid yam before 96-hour UV ageing, B: untreated para-aramid yam after 96-hour UV ageing, C: CPACe-coated para-aramid yam before 96-hour UV ageing, D: CPACe-coated para-aramid yam after 96-hour UV ageing). Figure 4: XPS results of aramid yarns (A: XPS survey spectra of untreated paraaramid yarn (PA) and CPACe samples, B: C1s XPS spectrum for PA and C: C1s XPS spectrum for CPACe).

[0017] Figure 5: FTIR-ATR results of aramid yams (CPACe-UV: CPACe after 96 hours of UV ageing, CPACe: coating obtained by a total of 10 layers formed by 5 repetitions of the sequential pair CeO2(-) / CeO2(+) prepared at 1 g / L on top of a 1-day CPA coating, dried at 100°C for 10 minutes at the end of coating, CPA-UV: CPA after 96 hours of UV ageing, CPA: coating performed for 1 day in a CPA solution prepared with 30 / 10 mM catechol / TEPA using ultrasonication in open air, dried at 100°C for 10 minutes at the end of 1 day, PA-UV: PA after 96 hours of UV ageing, PA: untreated original paraaramid yam).

[0018] Detailed Description of the Invention

[0019] The invention relates to a coating method which provides protection of aramid materials against UV radiation. The method that is the subject of the invention coats the surface of the aramid material with cerium(IV) oxide (CeO2), hexagonal boron nitride (h-BN) nanoparticles, catechol / polyamine (CPA) and hydroxyapatite structures, and by benefiting from the radical-scavenging property of the coatings, the photocatalytic effect is prevented or reduced. Said method is a self-assembled Layer-by-Layer coating technique based on the formation of film layers through electrostatic attraction forces and secondary attraction forces which can operate at room temperature, and it eliminates the application difficulties and the constraints of working under special conditions encountered in previous techniques. For this reason, instead of applying abrasive pretreatments to aramid fibres, the invention enables Layer-by-Layer film coating on the fibre surface independently of the material by applying, as the first step, a CPA coating which acts as a molecular anchor.

[0020] The coating method used to provide UV resistance to aramid materials comprises the process steps of;

[0021] i. carrying out a sonication-assisted polymerisation reaction of a solution containing at least one of catechol, tetraethylene pentamine or polyethyleneimine under oxygen supply, ii. coating the first layer of the aramid material with CPA by continuing the oxygen supply and optionally shaking, using the CPA solution prepared for treating the surface of the aramid material,

[0022] iii. drying the coated aramid material or directly proceeding to the coating process without drying,

[0023] iv. preparing anionic and cationic dispersions using cerium(IV) oxide (CeO2) nanoparticles under sonication and preparing an anionic dispersion using hexagonal boron nitride (h-BN) nanoparticles,

[0024] v. preparing calcium hydroxide (Ca(OH)2) and sodium dihydrogen phosphate (NaH2PO4) solutions to synthesise in-situ hydroxyapatite (HAP) mineral on the aramid material surface,

[0025] vi. coating the first layer, which has been initially coated with CPA and then dried or undried after coating, by immersing it repeatedly into at least one of the solutions CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2(+), Ca(OH)2+Ce(NO3)36H2O, NaH2PO4(-) or nanoHAP, and rinsing with pure water after each coating except after CPA and Ca(OH)2coatings, and vii. drying the modified aramid materials upon completion of the Layer-by-Layer coating.

[0026] One embodiment of the method that is the subject of the invention comprises the process steps of;

[0027] i. carrying out a sonication-assisted polymerisation reaction of a catechol- polyamine (CPA) solution prepared at a 3:1 molar ratio under oxygen supply for 0.5-2 hours,

[0028] ii. coating the first layer of the aramid material with CPA by continuing the oxygen supply and shaking simultaneously at 25-75 rpm using the prepared CPA solution for treating the surface of the aramid material, and completing the coating within 1-24 hours,

[0029] iii. drying the coated aramid material at 90-110°C for 5-15 minutes or proceeding directly to the coating process without drying,

[0030] iv. preparing anionic (pH: 8-12) and cationic (pH: 2-5) dispersions using 0.1-1 g / L CeO2nanoparticles under sonication, and preparing anionic (pH: 8-12) dispersions using 0.1-1 g / L hexagonal boron nitride (h-BN) nanoparticles, v. preparing Ca(OH)2and NaH2PO4solutions with a Ca / P stoichiometric ratio of 1.67 to synthesise in-situ hydroxyapatite mineral on the surface of the aramid material,

[0031] vi. coating the first layer, which has been initially coated with CPA and then dried or undried after coating, by immersing it at least twice into at least one of the solutions CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2(+), Ca(OH)2+Ce(NO3)36H2O with a molar ratio of 100:1, NaH2PO4(-) or nanoHAP, and rinsing with pure water after each coating except after CPA and Ca(OH)2coatings, and

[0032] vii. drying the modified aramid materials in an oven at 90-110°C for 5-15 minutes upon completion of the Layer-by-Layer coating.

[0033] Another embodiment of the method that is the subject of the invention comprises the process steps of;

[0034] i. carrying out a sonication-assisted polymerisation reaction of the CPA solution prepared at a 3:1 molar ratio under oxygen supply for 1 hour,

[0035] ii. coating the first layer of the aramid material with CPA by continuing the oxygen supply and shaking simultaneously at 50 rpm using the prepared CPA solution for treating the surface of the aramid material, and completing the coating within 1 hour,

[0036] iii. drying the coated aramid material at 100°C for 10 minutes or proceeding directly to the coating process without drying,

[0037] iv. preparing anionic (pH: 11) and cationic (pH: 4) dispersions using 0.5-1 g / L CeO2nanoparticles under sonication, and preparing anionic (pH: 8-12) dispersions using 0.5-1 g / L hexagonal boron nitride (h-BN) nanoparticles, v. preparing Ca(OH)2and NaH2PO4solutions with a Ca / P stoichiometric ratio of 1.67 to synthesise in-situ hydroxyapatite (HAP) mineral on the surface of the aramid material,

[0038] vi. coating the first layer, which has been initially coated with CPA and then dried or undried after coating, by immersing it at least twice into at least one of the solutions CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2(+), Ca(OH)2+Ce(NO3)36H2O with a molar ratio of 100:1, NaH2PO4(-) or nanoHAP, and rinsing with pure water after each coating except after CPA and Ca(OH)2coatings, and vii. drying the modified aramid materials in an oven at 100°C for 10 minutes upon completion of the Layer-by-Layer coating.

[0039] In every embodiment of the coating method that is the subject of the invention, the first layer of the yarns is coated with a solution containing at least one of catechol, tetraethylene pentamine or polyethyleneimine, and this first layer is a polymeric coating.

[0040] The aramid coating that is the subject of the invention comprises at least one of the layers dried or undried CPA first layer, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2(+), NaH2PO4(-) or nanoHAP.

[0041] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA and h-BN(-), respectively.

[0042] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA and h-BN(-), respectively.

[0043] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-) and CPA, respectively.

[0044] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-) and CPA, respectively.

[0045] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA and CeO2(-), respectively.

[0046] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA and CeO2(-), respectively.

[0047] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-) and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-) and CPA, respectively.

[0048] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA and CeO2(+), respectively.

[0049] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA and CeO2(+), respectively.

[0050] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+) and CPA, respectively.

[0051] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+) and CPA, respectively.

[0052] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+), CPA, CeO2(-) and CeO2(+), respectively.

[0053] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+), CPA, CeO2(-) and CeO2(+), respectively.

[0054] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+) and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+) and CPA, respectively.

[0055] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-), CPA, CeO2(+) and CeO2(-), respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-), CPA, CeO2(+) and CeO2(-), respectively.

[0056] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-), CPA, CeO2(+) , CeO2(-) and CPA, respectively.

[0057] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-), CPA, CeO2(+) , CeO2(-) and CPA, respectively.

[0058] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(+) and h-BN(-), respectively.

[0059] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(+) and h-BN(-), respectively.

[0060] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-) and CPA, respectively.

[0061] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-) and CPA, respectively.

[0062] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+), CPA, h-BN(-) and CeO2(+), respectively.

[0063] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+), CPA, h-BN(-) and CeO2(+), respectively.

[0064] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+) and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+) and CPA, respectively.

[0065] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+) and h-BN(-), respectively.

[0066] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+) and h-BN(-), respectively.

[0067] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+) , h-BN(-) and CPA, respectively.

[0068] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+) , h-BN(-) and CPA, respectively.

[0069] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+) and CeO2(-), respectively.

[0070] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+) and CeO2(-), respectively.

[0071] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+) , CeO2(-) and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+) , CeO2(-) and CPA, respectively.

[0072] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, h-BN(-), CeO2(+), CPA, CeO2(-), CPA, h-BN(-) and CeO2(+), respectively.

[0073] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, h-BN(-), CeO2(+), CPA, CeO2(-), CPA, h-BN(-) and CeO2(+), respectively.

[0074] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, h-BN(-), CeO2(+), CPA, CeO2(-), CPA, h-BN(-), CeO2(+) and CPA, respectively.

[0075] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, h-BN(-), CeO2(+), CPA, CeO2(-), CPA, h-BN(-), CeO2(+) and CPA, respectively.

[0076] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(-), CPA, CeO2(+), h-BN(-), CPA and CeO2(-), respectively.

[0077] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(-), CPA, CeO2(+), h-BN(-), CPA and CeO2(-), respectively.

[0078] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(-) and CPA, respectively.

[0079] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(-) and CPA, respectively.

[0080] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2and NaH2PO4, respectively.

[0081] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2and NaH2PO4, respectively.

[0082] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0083] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0084] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA and nanoHAP, respectively.

[0085] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA and nanoHAP, respectively.

[0086] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2and NaH2PO4, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2and NaH2PO4, respectively.

[0087] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0088] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0089] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively.

[0090] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively.

[0091] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

[0092] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2- Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

[0093] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), respectively.

[0094] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), respectively.

[0095] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), respectively.

[0096] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), respectively.

[0097] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(+), respectively.

[0098] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(+), respectively.

[0099] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2- Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(+), respectively.

[0100] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(+), respectively.

[0101] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0102] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0103] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0104] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0105] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively.

[0106] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

[0107] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

[0108] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), respectively.

[0109] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), respectively.

[0110] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-) and CPA, respectively.

[0111] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-) and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(-), respectively.

[0112] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(-), respectively.

[0113] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(-), and CPA, respectively.

[0114] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-) and CPA, respectively.

[0115] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0116] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0117] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(- ), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0118] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0119] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

[0120] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

[0121] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

[0122] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

[0123] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2and NaH2PO4, respectively.

[0124] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2and NaH2PO4, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0125] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0126] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

[0127] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

[0128] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4and CPA, respectively.

[0129] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4and CPA, respectively.

[0130] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+) and CeO2(-), respectively.

[0131] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+) and CeO2(-), respectively.

[0132] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-) and CPA, respectively.

[0133] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-) and CPA, respectively.

[0134] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+) and CeO2(-), respectively.

[0135] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+) and CeO2(-), respectively.

[0136] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-) and CPA, respectively.

[0137] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-) and CPA, respectively.

[0138] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-) and CeO2(+), respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-) and CeO2(+), respectively.

[0139] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+) and CPA, respectively.

[0140] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+) and CPA, respectively.

[0141] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-) and CeO2(+), respectively.

[0142] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-) and CeO2(+), respectively.

[0143] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+) and CPA, respectively.

[0144] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+) and CPA, respectively.

[0145] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA and CeO2(+), respectively.

[0146] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA and CeO2(+), respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), nanoHAP, CeO2(+), nanoHAP, CeO2(+), nanoHAP and CeO2(+), respectively.

[0147] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), nanoHAP, CeO2(+), nanoHAP, CeO2(+), nanoHAP and CeO2(+), respectively.

[0148] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CPA, nanoHAP, CPA, CeO2(+), CPA, nanoHAP, CPA, CeO2(+), CPA, nanoHAP, CPA and CeO2(+) and CPA, respectively.

[0149] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CPA, nanoHAP, CPA, CeO2(+), CPA, nanoHAP, CPA, CeO2(+), CPA, nanoHAP, CPA and CeO2(+) and CPA, respectively.

[0150] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CPA, nanoHAP, CeO2(+), CPA, nanoHAP, CeO2(+), CPA, nanoHAP, CeO2(+), CPA and nanoHAP, respectively.

[0151] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CPA, nanoHAP, CeO2(+), CPA, nanoHAP, CeO2(+), CPA, nanoHAP, CeO2(+), CPA and nanoHAP, respectively.

[0152] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), nanoHAP, CPA, CPA, CeO2(+), nanoHAP, CPA, CPA, CeO2(+), nanoHAP, CPA, CPA and CeO2(+), respectively.

[0153] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), nanoHAP, CPA, CPA, CeO2(+), nanoHAP, CPA, CPA, CeO2(+), nanoHAP, CPA, CPA and CeO2(+), nanoHAP and CPA, respectively.

[0154] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA and CeO2(+), nanoHAP and CPA, respectively.

[0155] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA and CeO2(+), nanoHAP and CPA, respectively.

[0156] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA and CeO2(-) and nanoHAP, respectively.

[0157] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA and CeO2(-) and nanoHAP, respectively.

[0158] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), nanoHAP, CeO2(-), nanoHAP, CeO2(-), nanoHAP and CeO2(-) and nanoHAP, respectively.

[0159] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), nanoHAP, CeO2(-), nanoHAP, CeO2(-), nanoHAP and CeO2(-) and nanoHAP, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA and nanoHAP, respectively.

[0160] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA and nanoHAP, respectively.

[0161] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CPA, nanoHAP, CeO2(-), CPA, nanoHAP, CeO2(-), CPA, nanoHAP and CeO2(-), CPA and nanoHAP, respectively.

[0162] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CPA, nanoHAP, CeO2(-), CPA, nanoHAP, CeO2(-), CPA, nanoHAP and CeO2(-), CPA and nanoHAP, respectively.

[0163] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), nanoHAP, CPA, CPA, CeO2(-), nanoHAP, CPA, CPA, CeO2(-), nanoHAP, CPA, CPA and CeO2(-), nanoHAP and CPA, respectively.

[0164] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), nanoHAP, CPA, CPA, CeO2(-), nanoHAP, CPA, CPA, CeO2(-), nanoHAP, CPA, CPA and CeO2(-), nanoHAP and CPA, respectively.

[0165] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA and CeO2(-), nanoHAP and CPA, respectively.

[0166] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA and CeO2(-), nanoHAP and CPA, respectively.

[0167] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), nanoHAP, CPA, CeO2(+), CeO2(-), nanoHAP, CPA, CeO2(+), CeO2(-) and nanoHAP, respectively.

[0168] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), nanoHAP, CPA, CeO2(+), CeO2(-), nanoHAP, CPA, CeO2(+), CeO2(-) and nanoHAP, respectively.

[0169] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), nanoHAP, CeO2(+), CeO2(-), nanoHAP, CeO2(+), CeO2(-) and nanoHAP, respectively.

[0170] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), nanoHAP, CeO2(+), CeO2(-), nanoHAP, CeO2(+), CeO2(-) and nanoHAP, respectively.

[0171] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), nanoHAP, CPA, CeO2(-), CeO2(+), nanoHAP, CPA and CeO2(-), CeO2(+) and nanoHAP, respectively.

[0172] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), nanoHAP, CPA, CeO2(-), CeO2(+), nanoHAP, CPA and CeO2(-), CeO2(+) and nanoHAP, respectively.

[0173] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), nanoHAP, CeO2(-), CeO2(+), nanoHAP, CeO2(-), CeO2(+) and nanoHAP, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), nanoHAP, CeO2(-), CeO2(+), nanoHAP, CeO2(-), CeO2(+) and nanoHAP, respectively.

[0174] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2and NaH2PO4, respectively.

[0175] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2and NaH2PO4, respectively.

[0176] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4and CPA, respectively.

[0177] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4and CPA, respectively.

[0178] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, h-BN, CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA and h-BN(-), respectively.

[0179] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA and h-BN(-), respectively.

[0180] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-) and CPA, respectively.

[0181] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, h-BN, CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-) and CPA, respectively.

[0182] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0183] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0184] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0185] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0186] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

[0187] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4and CPA, respectively.

[0188] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0189] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0190] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0191] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0192] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

[0193] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

[0194] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4and CPA, respectively.

[0195] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0196] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2and NaH2PO4, respectively.

[0197] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0198] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

[0199] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively.

[0200] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively. In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP, CPA, CeO2(-), CeO2(+), h-BN(-), CPA and nanoHAP, respectively.

[0201] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP, CPA, CeO2(-), CeO2(+), h-BN(-), CPA and nanoHAP, respectively.

[0202] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP and CPA, respectively.

[0203] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP and CPA, respectively.

[0204] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP, CPA, h-BN(-), CeO2(+), CeO2(-), CPA and nanoHAP, respectively.

[0205] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP, CPA, h-BN(-), CeO2(+), CeO2(-), CPA and nanoHAP, respectively.

[0206] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP and CPA, respectively.

[0207] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP and CPA, respectively.

[0208] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-) and CeO2(+), respectively.

[0209] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-) and CeO2(+), respectively.

[0210] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first undried CPA layer, the layers CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+) and CPA, respectively.

[0211] In one embodiment of the invention, the coating used to provide UV resistance to aramid materials comprises, on a first dried CPA layer, the layers CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+) and CPA, respectively. In some embodiments of the invention, the coatings thus obtained (as specified above) are also provided in Table 1. Table 1. The coatings obtained in some embodiments of the invention

[0212] Coating bath order Number Total Coating Number of

[0213] 1 2 3 4 5 6 7 8 9 of number variations layers / cycle

[0214] repetitions of layers 1 CPA° 1 1 2.1 CPA h-BN (-) 2 5 10 2.2 CPA°1h-BN (-) 2 5 10 2.3 CPA* h-BN (-) CPA 1+2 5 1+10=11 2.4 CPA*° h-BN (-) CPA 1+2 5 1+10=11 3.1 CPA CeO2(-) 2 5 10 3.2 CPA°1CeO2(-) 2 5 10 3.3 CPA* CeO2(-) CPA 1+2 5 1+10=11 3.4 CPA*° CeO2(-) CPA 1+2 5 1+10=11 3.5 CPA CeO2(+) 2 5 10 3.6 CPA°1CeO2(+) 2 5 10 3.7 CPA* CeO2(+) CPA 1+2 5 1+10=11 3.8 CPA*° CeO2(+) CPA 1+2 5 1+10=11 3.9 CPA CeO2(-) CeO2(+) 3 3 9 3.10 CPA°1CeO2(-) CeO2(+) 3 3 9 3.11 CPA* CeO2(-) CeO2(+) CPA 1+3 3 1+9=10 3.12 CPA*° CeO2(-) CeO2(+) CPA 1+3 3 1+9=10 3.13 CPA CeO2(+) CeO2(-) 3 3 9 3.14 CPA°1CeO2(+) CeO2(-) 3 3 9 3.15 CPA* CeO2(+) CeO2(-) CPA 1+3 3 1+9=10 3.16 CPA*° CeO2(+) CeO2(-) CPA 1+3 3 1+9=10 4.1 CPA CeO2(+) h-BN (-) 3 3 9 4.2 CPA°1CeO2(+) h-BN (-) 3 3 9 4.3 CPA* CeO2(+) h-BN (-) CPA 1+3 3 1+9=10 4.4 CPA*° CeO2(+) h-BN (-) CPA 1+3 3 1+9=10 4.5 CPA h-BN (-) CeO2(+) 3 3 9 4.6 CPA°1h-BN (-) CeO2(+) 3 3 9 4.7 CPA* h-BN (-) CeO2(+) CPA 1+3 3 1+9=10

[0215]

[0216] 4.8 CPA*° h-BN (-) CeO2(+) CPA 1+3 3 1+9=10 4.9 CPA CeO2(-) CeO2(+) h-BN (-) 4 3 12 4.10 CPA°1CeO2(-) CeO2(+) h-BN (-) 4 3 12 4.11 CPA* CeO2(-) CeO2(+) h-BN (-) CPA 1+4 3 1+12=13 4.12 CPA*° CeO2(-) CeO2(+) h-BN (-) CPA 1+4 3 1+12=13 4.13 CPA h-BN (-) CeO2(+) CeO2(-) 4 3 12 4.14 CPA°1h-BN (-) CeO2(+) CeO2(-) 4 3 12 4.15 CPA* h-BN (-) CeO2(+) CeO2(-) CPA 1+4 3 1+12=13 4.16 CPA*° h-BN (-) CeO2(+) CeO2(-) CPA 1+4 3 1+12=13 4.17 CPA CeO2(-) CPA h-BN (-) CeO25 2 10

[0217] (+)

[0218] 4.18 CPA°1CeO2(-) CPA h-BN (-) CeO25 2 10

[0219] (+)

[0220] 4.19 CPA* CeO2(-) CPA h-BN (-) CeO2CPA 1+5 2 1+10=11

[0221] (+)

[0222] 4.20 CPA*° CeO2(-) CPA h-BN (-) CeO2CPA 1+5 2 1+10=11

[0223] (+)

[0224] 4.21 CPA CeO2(+) h-BN (-) CPA CeO25 2 10

[0225] (-)

[0226] 4.22 CPA°1CeO2(+) h-BN (-) CPA CeO25 2 10

[0227] (-)

[0228] 4.23 CPA* CeO2(+) h-BN (-) CPA CeO2CPA 1+5 2 1+10=11

[0229] (-)

[0230] 4.24 CPA*° CeO2(+) h-BN (-) CPA CeO2CPA 1+5 2 1+10=11

[0231] (-)

[0232] 5.1 CPA Ca P 2 5 10 5.2 CPA°1Ca P 2 5 10 5.3 CPA* Ca P CPA 1+2 5 1+10=11 5.4 CPA*° Ca P CPA 1+2 5 1+10=11 5.5 CPA nanoHAP 2 5 10 5.6 CPA°1nanoHAP 2 5 10 5.7 CPA* nanoHAP CPA 1+2 5 1+10=11 5.8 CPA*° nanoHAP CPA 1+2 5 1+10=11 6.1 CPA CeO2(+) CPA Ca P 4 3 12

[0233]

[0234] 6.2 CPA°1CeO2(+) CPA Ca P 4 3 12 6.3 CPA* CeO2(+) CPA Ca P CPA 1+4 3 1+12=13 6.4 CPA*° CeO2(+) CPA Ca P CPA 1+4 3 1+12=13 6.5 CPA CeO2(+) CPA Ca+Ce P 4 3 12 6.6 CPA°1CeO2(+) CPA Ca+Ce P 4 3 12 6.7 CPA* CeO2(+) CPA Ca+Ce P CPA 1+4 3 1+12=13 6.8 CPA*° CeO2(+) CPA Ca+Ce P CPA 1+4 3 1+12=13 6.9 CPA Ca P CPA CeO24 3 12

[0235] (+)

[0236] 6.10 CPA°1Ca P CPA CeO24 3 12

[0237] (+)

[0238] 6.11 CPA* Ca P CPA CeO2CPA 1+4 3 1+12=13

[0239] (+)

[0240] 6.12 CPA*° Ca P CPA CeO2CPA 1+4 3 1+12=13

[0241] (+)

[0242] 6.13 CPA Ca+Ce P CPA CeO24 3 12

[0243] (+)

[0244] 6.14 CPA°1Ca+Ce P CPA CeO24 3 12

[0245] (+)

[0246] 6.15 CPA* Ca+Ce P CPA CeO2CPA 1+4 3 1+12=13

[0247] (+)

[0248] 6.16 CPA*° Ca+Ce P CPA CeO2CPA 1+4 3 1+12=13

[0249] (+)

[0250] 6.17 CPA CeO2(-) CPA Ca P 4 3 12 6.18 CPA°1CeO2(-) CPA Ca P 4 3 12 6.19 CPA* CeO2(-) CPA Ca P CPA 1+4 3 1+12=13 6.20 CPA*° CeO2(-) CPA Ca P CPA 1+4 3 1+12=13 6.21 CPA CeO2(-) CPA Ca+Ce P 4 3 12 6.22 CPA°1CeO2(-) CPA Ca+Ce P 4 3 12 6.23 CPA* CeO2(-) CPA Ca+Ce P CPA 1+4 3 1+12=13 6.24 CPA*° CeO2(-) CPA Ca+Ce P CPA 1+4 3 1+12=13 6.25 CPA Ca P CPA CeO24 3 12

[0251] (-)

[0252] 6.26 CPA°1Ca P CPA CeO24 3 12

[0253]

[0254] ±) _ 6.27 CPA* Ca P CPA CeO2CPA 1+4 3 1+12=13

[0255] (-)

[0256] 6.28 CPA*° Ca P CPA CeO2CPA 1+4 3 1+12=13

[0257] (-)

[0258] 6.29 CPA Ca+Ce P CPA CeO24 3 12

[0259] (-)

[0260] 6.30 CPA°1Ca+Ce P CPA CeO24 3 12

[0261] (-)

[0262] 6.31 CPA* Ca+Ce P CPA CeO2CPA 1+4 3 1+12=13

[0263] (-)

[0264] 6.32 CPA*° Ca+Ce P CPA CeO2CPA 1+4 3 1+12=13

[0265] (-)

[0266] 6.33 CPA CeO2(+) CeO2(-) CPA Ca P 5 2 10 6.34 CPA°1CeO2(+) CeO2(-) CPA Ca P 5 2 10 6.35 CPA* CeO2(+) CeO2(-) CPA Ca P CPA 1+5 2 1+10=11 6.36 CPA*° CeO2(+) CeO2(-) CPA Ca P CPA 1+5 2 1+10=11 6.37 CPA CeO2(+) CeO2(-) CPA Ca+Ce P 5 2 10 6.38 CPA°1CeO2(+) CeO2(-) CPA Ca+Ce P 5 2 10 6.39 CPA* CeO2(+) CeO2(-) CPA Ca+Ce P CPA 1+5 2 1+10=11 6.40 CPA*° CeO2(+) CeO2(-) CPA Ca+Ce P CPA 1+5 2 1+10=11 6.41 CPA CeO2(-) CeO2(+) CPA Ca P 5 2 10 6.42 CPA°1CeO2(-) CeO2(+) CPA Ca P 5 2 10 6.43 CPA* CeO2(-) CeO2(+) CPA Ca P CPA 1+5 2 1+10=11 6.44 CPA*° CeO2(-) CeO2(+) CPA Ca P CPA 1+5 2 1+10=11 6.45 CPA CeO2(-) CeO2(+) CPA Ca+Ce P 5 2 10 6.46 CPA°1CeO2(-) CeO2(+) CPA Ca+Ce P 5 2 10 6.47 CPA* CeO2(-) CeO2(+) CPA Ca+Ce P CPA 1+5 2 1+10=11 6.48 CPA*° CeO2(-) CeO2(+) CPA Ca+Ce P CPA 1+5 2 1+10=11 6.49 CPA Ca P CPA CeO2CeO2(-) 5 2 10

[0267] (+)

[0268] 6.50 CPA°1Ca P CPA CeO2CeO2(-) 5 2 10

[0269] (+)

[0270] 6.51 CPA* Ca P CPA CeO2CeO2(-) CPA 1+5 2 1+10=11

[0271]

[0272] (±) _ 6.52 CPA*° Ca P CPA CeO2CeO2(-) CPA 1+5 2 1+10=11

[0273] (+)

[0274] 6.53 CPA Ca+Ce P CPA CeO2CeO2(-) 5 2 10

[0275] (+)

[0276] 6.54 CPA°1Ca+Ce P CPA CeO2CeO2(-) 5 2 10

[0277] (+)

[0278] 6.55 CPA* Ca+Ce P CPA CeO2CeO2(-) CPA 1+5 2 1+10=11

[0279] (+)

[0280] 6.56 CPA*° Ca+Ce P CPA CeO2CeO2(-) CPA 1+5 2 1+10=11

[0281] (+)

[0282] 6.57 CPA Ca P CPA CeO2CeO2(+) 5 2 10

[0283] (-)

[0284] 6.58 CPA°1Ca P CPA CeO2CeO2(+) 5 2 10

[0285] (-)

[0286] 6.59 CPA* Ca P CPA CeO2CeO2(+) CPA 1+5 2 1+10=11

[0287] (-)

[0288] 6.60 CPA*° Ca P CPA CeO2CeO2(+) CPA 1+5 2 1+10=11

[0289] (-)

[0290] 6.61 CPA Ca+Ce P CPA CeO2CeO2(+) 5 2 10

[0291] (-)

[0292] 6.62 CPA°1Ca+Ce P CPA CeO2CeO2(+) 5 2 10

[0293] (-)

[0294] 6.63 CPA* Ca+Ce P CPA CeO2CeO2(+) CPA 1+5 2 1+10=11

[0295] (-)

[0296] 6.64 CPA*° Ca+Ce P CPA CeO2CeO2(+) CPA 1+5 2 1+10=11

[0297] (-)

[0298] 6.65 CPA CeO2(+) nanoHAP 3 4 12 6.66 CPA°1CeO2(+) nanoHAP 3 4 12 6.67 CPA* CeO2(+) nanoHAP 1+2 4 1+8=9 6.68 CPA*° CeO2(+) nanoHAP 1+2 4 1+8=9 6.69 CPA CeO2(+) CPA nanoHAP 4 4 16 6.70 CPA°1CeO2(+) CPA nanoHAP 4 4 16 6.71 CPA* CeO2(+) CPA nanoHAP 1+3 4 1+12=13

[0299]

[0300] 6.72 CPA*° CeO2(+) CPA nanoHAP 1+3 4 1+12=13 6.73 CPA CeO2(+) nanoHAP CPA 4 4 16 6.74 CPA°1CeO2(+) nanoHAP CPA 4 4 16 6.75 CPA* CeO2(+) nanoHAP CPA 1+3 4 1+12=13 6.76 CPA*° CeO2(+) nanoHAP CPA 1+3 4 1+12=13 6.77 CPA CeO2(-) nanoHAP 3 4 12 6.78 CPA°1CeO2(-) nanoHAP 3 4 12 6.79 CPA* CeO2(-) nanoHAP 1+2 4 1+8=9 6.80 CPA*° CeO2(-) nanoHAP 1+2 4 1+8=9 6.81 CPA CeO2(-) CPA nanoHAP 4 4 16 6.82 CPA°1CeO2(-) CPA nanoHAP 4 4 16 6.83 CPA* CeO2(-) CPA nanoHAP 1+3 4 1+12=13 6.84 CPA*° CeO2(-) CPA nanoHAP 1+3 4 1+12=13 6.85 CPA CeO2(-) nanoHAP CPA 4 4 16 9.86 CPA°1CeO2(-) nanoHAP CPA 4 4 16 6.87 CPA* CeO2(-) nanoHAP CPA 1+3 4 1+12=13 6.88 CPA*° CeO2(-) nanoHAP CPA 1+3 4 1+12=13 6.89 CPA CeO2(+) CeO2(-) nanoHAP 4 3 12 6.90 CPA°1CeO2(+) CeO2(-) nanoHAP 4 3 12 6.91 CPA* CeO2(+) CeO2(-) nanoHAP 1+3 3 1+9=10 6.92 CPA*° CeO2(+) CeO2(-) nanoHAP 1+3 3 1+9=10 6.93 CPA CeO2(-) CeO2(+) nanoHAP 4 3 12 6.94 CPA°1CeO2(-) CeO2(+) nanoHAP 4 3 12 6.95 CPA* CeO2(-) CeO2(+) nanoHAP 1+3 3 1+9=10 6.96 CPA*° CeO2(-) CeO2(+) nanoHAP 1+3 3 1+9=10 7.1 CPA h-BN (-) Ca P 3 3 9 7.2 CPA°1h-BN (-) Ca P 3 3 9 7.3 CPA* h-BN (-) Ca P CPA 1+3 3 1+9=10 7.4 CPA*° h-BN (-) Ca P CPA 1+3 3 1+9=10 7.5 CPA Ca P CPA h-BN (- 4 3 12

[0301] )

[0302] 7.6 CPA°1Ca P CPA h-BN (- 4 3 12

[0303] )

[0304] 7.7 CPA* Ca P CPA h-BN (- CPA 1+4 3 1+12=13

[0305]

[0306] ) 7.8 CPA*° Ca P CPA h-BN (- CPA 1+4 3 1+12=13

[0307] )

[0308] 8.1 CPA CeO2(-) CeO2(+) h-BN (-) CPA Ca P 6 2 12 8.2 CPA°1CeO2(-) CeO2(+) h-BN (-) CPA Ca P 6 2 12 8.3 CPA* CeO2(-) CeO2(+) h-BN (-) CPA Ca P CPA 1+6 2 1+12=13 8.4 CPA*° CeO2(-) CeO2(+) h-BN (-) CPA Ca P CPA 1+6 2 1+12=13 8.5 CPA CeO2(-) CeO2(+) h-BN (-) CPA Ca+Ce P 6 2 12 8.6 CPA°1CeO2(-) CeO2(+) h-BN (-) CPA Ca+Ce P 6 2 12 8.7 CPA* CeO2(-) CeO2(+) h-BN (-) CPA Ca+Ce P CPA 1+6 2 1+12=13 8.8 CPA*° CeO2(-) CeO2(+) h-BN (-) CPA Ca+Ce P CPA 1+6 2 1+12=13 8.9 CPA h-BN (-) CeO2(+) CeO2(-) CPA Ca P 6 2 12 8.10 CPA°1h-BN (-) CeO2(+) CeO2(-) CPA Ca P 6 2 12 8.11 CPA* h-BN (-) CeO2(+) CeO2(-) CPA Ca P CPA 1+6 2 1+12=13 8.12 CPA*° h-BN (-) CeO2(+) CeO2(-) CPA Ca P CPA 1+6 2 1+12=13 8.13 CPA h-BN (-) CeO2(+) CeO2(-) CPA Ca+Ce P 6 2 12 8.14 CPA°1h-BN (-) CeO2(+) CeO2(-) CPA Ca+Ce P 6 2 12 8.15 CPA* h-BN (-) CeO2(+) CeO2(-) CPA Ca+Ce P CPA 1+6 2 1+12=13 8.16 CPA*° h-BN (-) CeO2(+) CeO2(-) CPA Ca+Ce P CPA 1+6 2 1+12=13 8.17 CPA CeO2(+) CeO2(-) CPA h-BN (- CPA Ca P 7 2 14

[0309] )

[0310] 8.18 CPA°1CeO2(+) CeO2(-) CPA h-BN (- CPA Ca P 7 2 14

[0311] )

[0312] 8.19 CPA* CeO2(+) CeO2(-) CPA h-BN (- CPA Ca P CPA 1+7 2 1+14=15

[0313] )

[0314] 8.20 CPA*° CeO2(+) CeO2(-) CPA h-BN (- CPA Ca P CPA 1+7 2 1+14=15

[0315] )

[0316] 8.21 CPA CeO2(+) CeO2(-) CPA h-BN (- CPA Ca+Ce P 7 2 14

[0317] )

[0318] 8.22 CPA°1CeO2(+) CeO2(-) CPA h-BN (- CPA Ca+Ce P 7 2 14

[0319] )

[0320] 8.23 CPA* CeO2(+) CeO2(-) CPA h-BN (- CPA Ca+Ce P CPA 1+7 2 1+14=15

[0321] )

[0322] 8.24 CPA*° CeO2(+) CeO2(-) CPA h-BN (- CPA Ca+Ce P CPA 1+7 2 1+14=15

[0323]

[0324] ) _ 8.25 CPA CeO2(-) CeO2(+) h-BN (-) CPA nanoHAP 6 2 12 8.26 CPA°1CeO2(-) CeO2(+) h-BN (-) CPA nanoHAP 6 2 12 8.27 CPA* CeO2(-) CeO2(+) h-BN (-) CPA nanoHAP CPA 1+6 2 1+12=13 8.28 CPA*° CeO2(-) CeO2(+) h-BN (-) CPA nanoHAP CPA 1+6 2 1+12=13 8.29 CPA h-BN (-) CeO2(+) CeO2(-) CPA nanoHAP 6 2 12 8.30 CPA°1h-BN (-) CeO2(+) CeO2(-) CPA nanoHAP 6 2 12 8.31 CPA* h-BN (-) CeO2(+) CeO2(-) CPA nanoHAP CPA 1+6 2 1+12=13 8.32 CPA*° h-BN (-) CeO2(+) CeO2(-) CPA nanoHAP CPA 1+6 2 1+12=13 9.1 CPA* CeO2(-) CeO2(+) 1+2 5 1+10=11

[0325]

[0326] 9.2 CPA*° CeO2(-) CeO2(+) 1+2 5 1+10=11 CPA = The undried CPA layer is included in the Layer- by- Layer coating method (LbL); CPA° = The dried CPA layer is included in the Layer-by- Layer coating method (LbL); CPA* = The undried CPA layer is not included in the Layer-by-Layer coating method (LbL); CPA*° = The dried CPA layer is not included in the Layer-by-Layer coating method (LbL). Ca = Ca(OH)2, P = NaH2PO4, Ca+Ce = Ca(OH)2-Ca(OH)2-Ce(NO3)36H2O.

[0327] Table 2. The coatings obtained in some embodiments of the invention

[0328] Coating bath order Total Coating

[0329] 1 2 3 4 5 6 7 8 9 10 11 12 number variations

[0330] of layers 9.3 CPA* CeO2(-) CeO2(+) CeO2(-) CeO2CeO2(-) CeO2CeO2CeO2CeO2CeO2CPA 12

[0331] (+) (+) (-) (+) (-) (+)

[0332] 9.4 CPA*° CeO2(-) CeO2(+) CeO2(-) CeO2CeO2(-) CeO2CeO2CeO2CeO2CeO2CPA 12

[0333]

[0334] (±) _ (±) _ _t) _ (±) _ ±) _ (±) _

[0335] CPA* = The undried CPA layer is not included in the Layer-by-Layer coating method (LbL); CPA*° = The dried CPA layer is not included in the Layer-by-Layer coating

[0336]

[0337] (LbL).

[0338] 41 The coating that is the subject of the invention begins with dried or undried CPA. Whether drying is performed or not, the first CPA coating either becomes part of the LbL coating and takes place in the repeating cycle, or it remains as the base coating and the repeating cycle begins after this base coating. Since CPA contains both anionic and cationic species, after the first CPA coating, coating can be carried out with either anionic or cationic species, or CPA can be placed within the cycle as an oppositely charged layer between two layers having the same ionic character. Anionic and cationic species must follow one another. There is no restriction on which ionic species comes first or later, as long as the condition of sequential alternation is met. CeO2is prepared in two forms, anionic and cationic, whereas h-BN is prepared only in anionic form. Since CPA provides binding sites for Ca2+in in-situ hydroxyapatite synthesis, CPA is followed by calcium and then by the phosphate precursor. Thus, the sequential trio CPA / Ca / P follows consecutively in every application in which they appear. However, this sequential trio may be placed anywhere within the cycle provided that it does not occur at the beginning. Although Ca and P are located in two separate baths for in-situ hydroxyapatite synthesis, a single hydroxyapatite layer forms when they are coated sequentially. In coatings containing in-situ hydroxyapatite, cerium may be incorporated in three ways: by the use of CeO2nanoparticles (which can themselves be used in three different ways: (i) only anionic, (ii) only cationic, or (iii) both anionic and cationic nanoparticles), or by adding Ce(NO3)36H2O salt to the Ca precursor solution, or by both using CeO2nanoparticles and adding Ce salt to the Ca precursor solution. Instead of in-situ hydroxyapatite, nanoHAP obtained ready-made can also be used and can be adjusted to be either anionic or cationic. The LbL coating must end with CPA or HAP. However, this requirement is based on predictions that UV protection will be higher. Therefore, options that do not end with CPA or HAP are also included in the variations and may be applied if preferred.

[0339] As stated, in one application of the coating obtained in the invention, the layer sequence is, respectively, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2(+), NaH2PO4(-) on top of the first dried CPA layer. Here, for in-situ HAP synthesis, when sequential processing is carried out with precursor solutions containing calcium and phosphate, a single HAP layer is formed. For example, in the sequence mentioned, there are 7 layers, but since one layer is obtained from the last two layers, namely the calcium and phosphate precursors, a total of 6 layers are formed. Since CPA contains both anionic and cationic species, it can be used before or after both anionic and cationic solutions or dispersions. However, in every application of the invention, the first layer of the coating must be CPA. The reason for this is that the inert structure of the aramid materials becomes functionalised only after the CPA coating. Since surface activation with CPA is required, and apart from the obligation to start with CPA and end with HAP or with CPA and HAP to protect the nanoparticles, the sequences may vary. HAP or CPA and HAP are included as the final protective layer in order to prevent direct contact of CeO2and h-BN nanoparticles with UV radiation and / or to suppress possible photocatalytic activities in case of contact with UV radiation and / or to scavenge radicals that may form on the surface.

[0340] The aramid multifilament non-twisted yams used in the invention are wound up to a continuous length of 15 m onto the hooks of steel 304 frames with a length / width ratio of 32.5x16.5 and are subjected to application and UV ageing. This is done due to the requirement of 25 cm length in the tensile strength test. For fabrics, for similar reasons, the sample length is in the range of 35-50 cm and the width is in the range of 30-40 cm.

[0341] In the method that is the subject of the invention, the Layer-by-Layer coating method (LbL) used in the coatings involves immersing the solid-phase substrate (aramid materials — yams and fabrics) successively into anionic and cationic nanoparticle dispersions or into the CPA coating solution. The electrostatic Layer-by-Layer coating process begins after

[0342] a single-step CPA coating is applied onto the aramid material, which has not undergone any pre-cleaning or acid / alkali pretreatment. Following this initial coating, the surface of the aramid materials becomes charged with anionic and cationic species. However, it is suggested that structures such as o-quinone and hydroxyquinone, which form through the oxidation of the catechol group, assemble with the aramid via TT-TT stacking and adhere by means of H-bridges, and that while one end of the amine binds to the catechol through a Schiff-base reaction or Michael addition, its other end (R-NH2) remains relatively free. Therefore, it is considered that functional groups of the system such as R-NH2and OH engage in electrostatic and / or coordinative interactions with anionic and cationic species. For this reason, the self-assembly method begins with immersing the positively / negatively charged aramid material, obtained after CPA coating, into positively / negatively charged nanoparticle dispersions. Afterwards, the excess of the cationic / anionic nanoparticle dispersion electrostatically held on the surface is removed by washing the aramid material in a neutral solution. Under suitable conditions, a polyion adsorbed in a quantity exceeding the stoichiometric charge number of the material reverses the sign of the surface charge. Therefore, when the aramid material is treated with a second dispersion containing oppositely charged (cationic / anionic) nanoparticles or with a polymer solution (CPA), an additional cationic / anionic layer is once again adsorbed by reversing the sign of the surface charge in the same way. As a result of the successive adsorption of anionic and cationic species, a thin-film coating containing nano ayers is obtained on the aramid materials, thereby completing the process.

[0343] In the application of the self-assembly method, components with the same surface charge can be prepared in a single bath. In case of incompatibility, the number of oppositely charged dispersions or polyion solutions can be increased. Thus, with this method, rather than preparing materials to be incorporated as UV absorbents through a long and complex synthesis process at a separate location followed by a separate application step, on-site applications can be carried out. For example, hydroxyapatite can be formed in situ on CPA-coated aramid materials from calcium and phosphate precursors by means of the self-assembly method. The catechol group (the OH group on the benzene ring) can form coordinate covalent bonds with the calcium (Ca2+) ions in the hydroxyapatite structure. These bonds bind the lone electron pair on the oxygen atom of the catechol group to the Ca2+ion. There is an electrostatic interaction between the ammonium group (NH3+) present in the tetraethylenepentamine (TEPA) molecule and the phosphate group (P043-) in the hydroxyapatite structure. The amine groups in the TEPA molecule can form hydrogen bonds with free hydrogen or oxygen atoms on the h-BN surface. In addition, the TEPA molecule can adsorb onto the vacancies or irregularities on the h-BN surface. In open air, atmospheric oxygen together with the alkaline effect of TEPA provides the environment required for oxidative polymerisation. The UV-Vis results provided for the preparation of the CPA coating solution, given in Figure 1 , are indicative of this situation. In the results presented in Figure 1 , the absorbance of catechol at 220 and 275 nm is attributed to the

[0344]

[0345] transition associated with an aromatic ring and to the n— >TT* transition involving lone electron pairs of the hydroxyl substituent, and the new broad absorbance peak at 362 nm for CPA solutions is attributed to catecholamine reactions following quinone-mediated oxidation. Moreover, the decrease in intensity of the shoulder peak at 325 nm after 24 hours, likely originating from the oxidation of catechol to o-quinone, together with the peak developing at 478 nm, is indicative of the consumption of quinone via Schiff-base reaction and / or Michael addition. The UV-Vis spectrum of the CPA solution confirms the developing catecholamine reactions and therefore the polymerisation of CPA, and demonstrates the presence of suitable conditions for applying an LbL coating independently of the material.

[0346] By means of the layers formed with the self-assembled coating technique, the weak UV resistance of aramid materials is improved and, correspondingly, the loss of strength that occurs is prevented. When CeO2, which is effective in UVA protection, and h-BN nanoparticles, which are effective in UVB / UVC protection, are used together, broad-spectrum protection is achieved. This provides protection not only against the UVA and UVB rays of the Sun that reach the Earth’s surface, but also against UVC rays emitted in space or from artificial sources. Since the surface area of nanoparticles is quite large, an efficient and effective coating is achieved with a small amount of nanoparticles, and the UV protection efficiency is increased due to the absorption of UV radiation by these nanoparticle crystals and / or the scattering of UV radiation from the nanoparticle crystals, because the band-gap energy of nanoparticles is close to the energy of UV radiation. In the tests performed, cracks were observed in the coating after UV ageing; however, together with the strength results, this shows that the CPA coating itself is affected by UV radiation but protects the aramid material. The strength properties of aramid yarns, particularly the breaking strength (cN / dtex) and breaking elongation (%), are presented in Figure 2; the stated analysis was carried out for Recipe 9.2, which is an application of the invention. The CPA coating initially increased the strength of the untreated para-aramid yam (PA) (from 21.2 to 22.1), but the subsequent LbL coating reduced this (to 21.1), appearing to bring it back almost to its original value (21.2). This effect can be attributed to the use of acid and alkali in the LbL coating process for pH adjustment. After UV ageing, both PA and CPA-coated yam samples exhibit similar strength, and this shows that the CPA coating is very thin and insufficient to protect PA against UV radiation. However, both have a breaking strength retention ratio of 85%, which is surprisingly good compared with the typically reported value of 75%. This can likely be attributed to the relatively shorter UV ageing test duration (96 hours) compared with previous studies in the state of the art [2, 3] (168 hours). In the studies present in the state of the art, ageing was performed for 168 hours. In those studies, untreated original aramid fibres retained approximately 75% of their breaking strength at the end of this 168-hour ageing period, with a 25% loss in strength. In the invention, since ageing was conducted for 96 hours, the damage caused by UV radiation to the aramid fibre is lower; 85% of the strength was retained, meaning that there was a 15% reduction. In the case of the CPACe coating, 93% of the breaking strength was retained after UV ageing, which confirms the effectiveness of the LbL coating. In terms of elongation percentages, both CPA and CPACe coatings are seen to be less affected by UV radiation compared with PA.

[0347] To overcome the inert surface of aramid materials, a CPA coating is applied in the first step. For this, aqueous solutions are prepared using only catechol and polyamine components without the need for any pH adjustment. In preparing the CPA coating, sonication-assisted polymerisation is carried out. Thus, the difficulty of directly applying a conventional coating due to the inert nature of aramid fibres is overcome by means of the CPA coating without causing fibre damage. To shorten the polymerisation time and accelerate the reaction, oxygen is supplied to the solution using a simple air pump. After aramid yarns and fabrics are treated with the CPA coating solution, they are either dried depending on the subsequent process or the self-assembled coating processes are continued directly without drying. To provide effective protection in the UVA region, anionic (pH: 8-12) and cationic (pH: 2-5) dispersions are prepared using CeO2nanoparticles. To provide effective protection in the UVB / UVC regions, only an anionic (pH: 8-12) dispersion is prepared using h-BN nanoparticles. To reduce or prevent the possible photocatalytic activity of UV-protective nanoparticles, hydroxyapatite, which is suitable for producing a material that does not exhibit photocatalytic effect, is synthesised in-situ on the surface of the aramid material, and at the same time the radical-scavenging property of the CPA coating is utilised. Thus, photocatalytic activity and fibre damage that may arise from UV protectants are prevented.

[0348] In the developed method, different formulations were applied to determine the effect of UV-protective components. In the self-assembled coating processes, coating solutions containing oppositely charged polyelectrolytes are denoted as A and B. This indicates that the aramid material is coated using the sequential pair of anionic solution A followed by cationic solution B. In some cases, the sequence may be A, B, C, D, A, E, F; therefore, it should be remembered that sequential coatings must involve oppositely charged species.

[0349] As seen in the formulation variations, in coatings containing hydroxyapatite, hydroxyapatite can be formed in-situ from calcium and phosphate precursors or hydroxyapatite nanoparticles can be used directly. CeO2can be used in two ways, either as nanoparticles or as a cerium salt. In this way, the invention is highly versatile in terms of self-assembled coatings and offers a variety of coating possibilities.

[0350] The coating method that is the subject of the invention requires no special chemicals other than simple, readily accessible acid (HCI) and alkali (NaOH) used for pH adjustment. This makes the method accessible in industrial applications for preparing the coating and more suitable in line with the principles of green chemistry.

[0351] The invention is applicable to all types of surfaces and material forms within the framework of the self-assembly method, which involves maximising the fibre-coating interaction by taking into account all possible molecular interactions, primarily electrostatic interactions, and applying them in a specific order and arrangement. In this respect, the invention can also be applied in various areas such as windows, vehicle glass, curtains, garments and packaging materials where UV protection may serve a functional purpose.

[0352] The invention provides a simple, low-cost and universal method since the modification is carried out at atmospheric pressure and room temperature using simple production tools, and therefore it is not only suitable for mass production but can also be easily adapted to any scale, making it independent of the scale to be applied. Although it involves special and expensive materials such as h-BN and CeO2nanoparticles, an effective cost balance is achieved because they provide efficient UV protection using low amounts. In addition, CPA, the essential component of the coating, offers a significant advantage due to its cost being reducible to as low as 1% of the cost of existing PDA coatings. Furthermore, hydroxyapatite can be obtained from low-cost precursor solutions or handled at very low cost as a by-product of wastewater treatment plants, or it can be obtained from many natural sources (mussels, sea shells, chicken bones, etc.). In these respects, the invention offers a system with cost advantages and various raw material options in terms of current and future potential.

[0353] In the invention, the components possess properties that allow them to perform multiple functions. Thus, a process closer to the principles of green chemistry is provided with fewer chemicals and fewer process steps. The waste-prevention potential of the invention is quite high. In laboratory-scale studies carried out based on optimisation, the wastewater generated after the process is completed may contain trace levels of cross-contamination, but fundamentally each part belongs to the respective coating solutions / dispersions. This enables the wastewater to continue to be used in the next production by adding material to the respective solution or dispersion, provided that the designated concentration is maintained when the scale is increased.

[0354] In the invention, CPA is synthesised. Owing to CPA synthesis, functional groups are created on inert aramid surfaces without causing any fibre damage and without requiring additional treatments, thereby providing a base coating — that is, a template — for subsequent layers to be built upon. Since catechol and amine compounds each individually contribute to surface activity, they can be used at various stoichiometries. The products that may form during CPA synthesis in the invention include catechol, o-quinone and hydroxyquinone, and their binding to TEPA through Michael addition and / or Schiff-base reactions contributes to the formation of functional groups on the fibre surface. The addition of polyamine to the catechol structure promotes adhesion and enhances stabilisation by providing covalent interactions as well as non-covalent interactions such as iT-stacking and cation-n interactions. Apart from this, no hazardous intermediate or by-product arises for human or environmental health. The acid and alkali used to adjust the pH of the coating solutions / dispersions are prepared in diluted form and used in very small amounts, both for controlled processing and for preventing fibre damage.

[0355] The invention enables aramid materials and other materials or products to retain their functional properties for a longer period by preventing UV-induced early degradation that may occur during use. This provides significant benefits in terms of extending product lifetime, reducing waste generation and offering a sustainable system not only during production but also during use. The invention has been developed by focusing on a well-defined combination of safer chemicals while providing optimum UV protection. Catechol contains a benzene ring and has the potential to create oxidative stress, and TEPA is an organic amine that may cause toxicity in biological systems. However, because catechol and TEPA react and interact with the other components of the coating, a complex structure is formed, yielding a safer design. In the invention, water is the only solvent used. The only auxiliary substances are the acid and alkali used for pH adjustment. In this respect, the invention has an excellent profile in terms of safer solvents and auxiliaries. The entire coating process is carried out from start to finish at room temperature and atmospheric pressure. The use of sonication technology — which is highly efficient for solution preparation — and the use of an ultrasonic homogeniser that is globally unmatched in efficiency (90% and above) ensures the highest level of energy efficiency. Drying is the primary energyconsuming process; however, since the invention does not involve any intermediate drying step between film-coating cycles, its impact is kept to the minimum possible level. In the invention, drying is carried out only once, in the final processing step, after the Layer-by-Layer coating has been completed. In the invention, renewable raw materials include hydroxyapatite and catechol obtained from biological sources; recyclable but non-renewable materials include CeO2and h-BN; and non-renewable raw materials include TEPA. Nevertheless, the UV-protection system is highly favourable in terms of reuse and recycling potential because it contains valuable and rare materials.

[0356] The invention is based on the initial objective of reducing derivatives, and the experiments carried out have demonstrated that this theoretical approach is feasible in practice. In the oxidative polymerisation of catechol and TEPA compounds, the required oxidising environment was provided by the oxygen in the air and by additional oxygen supplied to the solution using an air pump, by the reactive oxygen species and energy generated by the sonicator, and by the alkaline effect of TEPA; therefore, polymerisation was achieved without using any additional oxidant chemicals.

[0357] The SEM analysis results of the aramid yams of the invention at 5000* magnification are given in Figure 2; this analysis was carried out for a particular embodiment of the invention, namely Recipe 9.1. Some small grooves are uniformly distributed along the longitudinal axis of the fibre (PA), illustrating axial alignment. Point-like spots attributed to the fibre production process are also visible. UV irradiation has very little effect on the PA morphology, which suggests insufficient UV ageing but also implies that the finishing treatment applied during the production process provides some degree of protection. A dense CPA coating is observed on the fibre surface following the deposition of CeO2nanoparticles. UV radiation appears to increase the density of the CPA coating layer and promote stronger adhesion to the fibre, which is consistent with previous observations. Additionally, surface cracks are evident in the CPA coating layer, and UV light causes the nanoparticles to flatten and become embedded in the CPA. In the case of CPACe, the CPA layer can serve two purposes: acting as a layer providing protection against direct UV damage, and mitigating potential damage arising from the photocatalytic activity of CeO2nanoparticles.

[0358] For the aramid yarns of the invention, the XPS survey analysis and the C1s corelevel spectra of both PA and CPACe samples are presented in Figure 4; this analysis was carried out for a particular embodiment of the invention, namely Recipe 9.2. In both samples, the C1s, O1s and N1s peaks appear in the wide-scan spectra at approximately ~285, ~532 and ~400 eV, respectively. However, the Ce3d peak (~900 eV) is observed only in the CPACe survey spectrum, confirming the LbL CeO2coating. Other species (Na1s and P2p for PA, and Si2p for CPACe) may originate from the production of the aramid fibres and / or be associated with contamination (Na1s corresponds to electrons in the 1s orbital of sodium; P2p corresponds to the 2p orbital of phosphorus; Si2p corresponds to the 2p orbital of silicon and is widely used in surface analyses of silicon-based materials). The deconvolution analysis of the C1s peak of PA reveals four distinct peaks: C-C (~284.6 eV), C-N (~285.8 eV), C=O (~287.5 eV) and O-C=O (~288.6 eV). Notably, as previously reported, a C-0 peak (~286.8 eV) is observed for CPACe, indicating catechol deposition. Furthermore, while the 0 / C ratio decreases, the N / C ratio increases. This finding may support the UV-vis results suggesting that aliphatic amines promote Schiff-base reactions.

[0359] The FTIR-ATR measurement results relating to the invention are shown in Figure 5, and said analysis was carried out for an application of the invention, namely Recipe 9.1. The FTIR spectra exhibit distinct amide-related peaks at the following wavenumbers: ~3310 cm-1(Amide A), ~1640 cm-1(Amide I), ~1538 cm-1(Amide II), -1305 cm-1, -1250 cm’1and -1227 cm’1(Amide III), -725 cm’1(Amide IV), -655 cm-1(Amide V). In addition, the bands at 822 cm-1and 1018 cm-1are characteristic of out-of-plane and in-plane C-H bending vibrations, respectively, and confirm the para-substitution of aramid. The absorption bands at -1510 cm-1and -1397 cm-1can be attributed to C=C

[0018] and C-C vibration modes in the benzene ring, respectively, while the band at 1109 cm-1is associated with C-0 stretching vibrations.

[0360] A slight increase has been observed in the relative intensity of Amide A / Amide I, which indicates the coating of CPA onto the fibres. However, it is seen that the signal originating from PA, which represents the fibre substrate, is dominant. Due to overlapping bands such as Amide A, the O-H stretching vibration of catechol and the N-H stretching vibration of TEPA; the Amide I region and the C=N stretching vibration possibly arising from the Schiff base reaction; the Amide II region and the bending vibration of N-H in TEPA, the presence of the CPA coating cannot be determined with precise certainty by this analysis method.

[0361] After UV ageing, a significant increase was observed in the Amide l / Amide II and Amide l / Amide III ratios in the CPA coating, and this situation appears in contrast to the decreasing trend in PA. This phenomenon is thought to be due to the formation of amide and N-H groups as a result of the breaking of the C-N bonds in the main chain of the aramid fibre, followed by oxidation of the chain end groups, the disruption of the hydrogen bonds between the C=O and N-H groups on adjacent chains, and / or partial chain scission. The increase observed in the CPA coating indicates that the oxidation of catechol species under UV light increases and that the amine chains in TEPA partially decompose. Overall, these differences observed during UV ageing indirectly confirm the effectiveness of the CPA coating. However, due to similarities in molecular units, it is of great importance to evaluate both the individual and combined effects of photo-oxidation on the catecholamine building blocks and on the aramid fibres. On the other hand, the CPACe coating remained almost unchanged, which indicates that the CeO2 coating may preserve the molecular structure against chain scission caused by UV radiation.

[0362] Since the invention relates to aramid fibres whose UV resistance is extremely limited, once their useful service life ends, the fibres may fragment under UV irradiation and / or may have the potential to be directly incorporated into innovative composite productions such as aramid nanofibre manufacturing through chemical processes. REFERENCES

[0363] [1] Sun H, Kong H, Ding H, Xu Q, Zeng J, Jiang F, Yu M and Zhang Y. “Improving UV Resistance of Aramid Fibers by Simultaneously Synthesizing TiO2 on Their Surfaces and in the Interfaces Between Fibrils / Microfibrils Using Supercritical Carbon Dioxide”. Polymers 2020, 12, 147

[0364] [2] Zhou, L., Yuan, L., Guan, Q., Gu, A., & Liang, G. (2017). Building unique surface structure on aramid fibers through a green layer-by-layer self-assembly technique to develop new high performance fibers with greatly improved surface activity, thermal resistance, mechanical properties and UV resistance. Applied Surface Science, 411, 34-45.

[0365] [3] Zhu, J., Yuan, L., Guan, Q., Liang, G., & Gu, A. (2017). A novel strategy of fabricating high performance UV-resistant aramid fibers with simultaneously improved surface activity, thermal and mechanical properties through building polydopamine and graphene oxide bilayer coatings. Chemical Engineering Journal, 310, 134-147.

Claims

CLAIMS1. A nano-coating method used for providing UV resistance to aramid materials, comprising the process steps of:i. carrying out a sonication-assisted polymerisation reaction under oxygen supply of a solution comprising at least one of catechol, tetraethylenepentamine or polyethylenimine,ii. coating the surface of the aramid material with the prepared CPA solution by continuing the oxygen supply and with or without shaking, thereby forming the first CPA layer on the aramid material,iii. drying the coated aramid material or proceeding directly to the coating process without drying,iv. preparing anionic and cationic dispersions using cerium(IV) oxide (CeO2) nanoparticles under sonication and preparing an anionic dispersion using hexagonal boron nitride (h-BN) nanoparticles,v. preparing calcium hydroxide (Ca(OH)2) and sodium dihydrogen phosphate (NaH2PO4) solutions for synthesising the hydroxyapatite (HAP) mineral in- situ on the surface of the aramid material,vi. repeatedly immersing the first layer, which is coated with CPA and dried or undried after coating, into at least one of the solutions CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2(+), Ca(OH)2+Ce(NO3)3-6H2O, NaH2PO4(-) or nanoHAP, except after CPA and Ca(OH)2coatings; rinsing with pure water after each coating, andvii. drying the modified aramid materials after completion of the layer-by-layer coating.

2. A method according to claim 1 , comprising the process steps of:i. carrying out a sonication-assisted polymerisation reaction under oxygen supply of a catechol-polyamine (CPA) solution prepared at a 3:1 molar ratio for 0.5-2 hours,ii. coating the surface of the aramid material with the prepared CPA solution by continuing the oxygen supply and simultaneously shaking at 25-75 rpm, thereby forming the first CPA layer on the aramid material after 1-24 hours, iii. drying the coated aramid material at 90-110 °C for 5-15 minutes or proceeding directly to the coating process without drying,iv. preparing anionic (pH: 8-12) and cationic (pH: 2-5) dispersions using 0.1- 1 g / L CeO2nanoparticles under sonication and preparing an anionic (pH: 8-12) dispersion using 0.1-1 g / L hexagonal boron nitride (h-BN) nanoparticles,v. preparing Ca(OH)2and NaH2PO4solutions at a Ca / P stoichiometric ratio of 1.67 for synthesising the hydroxyapatite mineral in-situ on the surface of the aramid material,vi. repeatedly immersing, at least twice, the first layer coated with CPA and dried or undried after coating into at least one of the solutions CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2(+), Ca(OH)2+Ce(NO3)3-6H2O with a 100:1 molar ratio, NaH2PO4(-) or nanoHAP, and rinsing with pure water after each coating except after CPA and Ca(OH)2coatings, andvii. drying the modified aramid materials in an oven at 90-110 °C for 5-15 minutes after completion of the Layer-by-Layer coating.

3. A method according to claim 1 , comprising the process steps of:i. carrying out a sonication-assisted polymerisation reaction of the CPA solution prepared at a 3:1 molar ratio under oxygen supply for 1 hour, ii. coating the surface of the aramid material with the prepared CPA solution by continuing the oxygen supply and simultaneously shaking at 50 rpm, thereby forming the first CPA layer on the aramid material after 1 hour, iii. drying the coated aramid material at 100 °C for 10 minutes or proceeding directly to the coating process without drying,iv. preparing anionic (pH: 11) and cationic (pH: 4) dispersions using 0.5-1 g / L CeO2nanoparticles under sonication and preparing an anionic (pH: 8-12) dispersion using 0.5-1 g / L hexagonal boron nitride (h-BN) nanoparticles, v. preparing Ca(OH)2and NaH2PO4solutions at a Ca / P stoichiometric ratio of 1.67 for synthesising the hydroxyapatite (HAP) mineral in-situ on the surface of the aramid material,vi. repeatedly immersing, at least twice, the first layer coated with CPA and dried or undried after coating into at least one of the solutions CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2(+), Ca(OH)2+Ce(NO3)3-6H2O with a 100:1 molar ratio, NaH2PO4(-) or nanoHAP, and rinsing with pure water after each coating except after CPA and Ca(OH)2coatings,vii. drying the modified aramid materials in an oven at 100 °C for 10 minutes after completion of the Layer-by-Layer coating.

4. A nano coating prepared by a method according to any one of claims 1-3, comprising at least one of a dried or undried first CPA layer, CeO2(-), CeO2(+), h- BN(-), CPA, Ca(OH)2(+), NaH2PO4(-) or HAP layers.

5. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA and h-BN(-), respectively.

6. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h- BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA and h-BN(-), respectively.

7. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-) and CPA, respectively.

8. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h- BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-), CPA, h-BN(-) and CPA, respectively.

9. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA and CeO2(-), respectively.10.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA and CeO2(-), respectively.

11. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-) and CPA, respectively.12.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-), CPA, CeO2(-) and CPA, respectively.

13. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA and CeO2(+), respectively.14.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA and CeO2(+), respectively.

15. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA and CeO2(+), CPA, respectively.16.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+), CPA, CeO2(+) and CPA, respectively.

17. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+), CPA, CeO2(-) and CeO2(+), respectively.18.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+), CPA, CeO2(-) and CeO2(+), respectively.

19. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+) and CPA, respectively.20.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+), CPA, CeO2(-), CeO2(+) and CPA, respectively.

21. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-), CPA, CeO2(+) and CeO2(-), respectively.22.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-), CPA, CeO2(+) and CeO2(-), respectively.

23. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-) and CPA, respectively.24.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-), CPA, CeO2(+), CeO2(-) and CPA, respectively.

25. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(+) and h-BN(-), respectively.26.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(+) and h-BN(-), respectively.

27. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-) and CPA, respectively.28.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(+), h-BN(-) and CPA, respectively.

29. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+), CPA, h-BN(-) and CeO2(+), respectively.

30. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h- BN(-), CeO2(+), CPA, h-BN(-), CeO2(+), CPA, h-BN(-) and CeO2(+), respectively.

31. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+) and CPA, respectively.

32. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h- BN(-), CeO2(+), CPA, h-BN(-), CeO2(+), CPA, h-BN(-), CeO2(+) and CPA, respectively.

33. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+) and h-BN(-), respectively.34.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+) and h-BN(-), respectively.

35. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+) and h-BN(-), and CPA, respectively.36.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+), h-BN(-), CPA, CeO2(-), CeO2(+) and h-BN(-), and CPA, respectively.

37. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+), CeO2(-), CPA, h- BN(-), CeO2(+) and CeO2(-), respectively.

38. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h- BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+) and CeO2(-), respectively.

39. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+), CeO2(-), CPA, h- BN(-), CeO2(+) and CeO2(-), and CPA, respectively.

40. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h- BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+), CeO2(-), CPA, h-BN(-), CeO2(+), CeO2(-) and CPA, respectively.

41. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, h-BN(-), CeO2(+), CPA, CeO2(-), CPA, h-BN(-) and CeO2(+), respectively.42.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, h-BN(-), CeO2(+), CPA, CeO2(-), CPA, h-BN(-) and CeO2(+), respectively.

43. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, h-BN(-), CeO2(+), CPA, CeO2(-), CPA, h-BN(-), CeO2(+) and CPA, respectively.44.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, h-BN(-), CeO2(+), CPA, CeO2(-), CPA, h-BN(-), CeO2(+) and CPA, respectively.

45. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(-), CPA, CeO2(+), h-BN(-), CPA and CeO2(-), respectively.46.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(-), CPA, CeO2(+), h-BN(-), CPA and CeO2(-), respectively.

47. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(-) and CPA, respectively.48.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), h-BN(-), CPA, CeO2(-), CPA, CeO2(+), h-BN(-), CPA, CeO2(-) and CPA, respectively.

49. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2and NaH2PO4, respectively.50.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2and NaH2PO4, respectively.

51. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4and CPA, respectively.52.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4, CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

53. A coating according to claim 4, comprising, on an undried first CPA layer, the layers nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA and nanoHAP, respectively.54.A coating according to claim 4, comprising, on a dried first CPA layer, the layers nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA and nanoHAP, respectively.

55. A coating according to claim 4, comprising, on an undried first CPA layer, the layers nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP and CPA, respectively.56.A coating according to claim 4, comprising, on a dried first CPA layer, the layers nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP, CPA, nanoHAP and CPA, respectively.

57. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA and Ca(OH)2and NaH2PO4, respectively.58.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA and Ca(OH)2and NaH2PO4, respectively.

59. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.60.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

61. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA and Ca(OH)2- Ce(NO3)36H2O and NaH2PO4, respectively.62.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA and Ca(OH)2- Ce(NO3)36H2O and NaH2PO4, respectively.

63. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2- Ce(NO3)36H2O, NaH2PO4and CPA, respectively.64.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2- Ce(NO3)36H2O, NaH2PO4and CPA, respectively.

65. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), respectively.66.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), respectively.

67. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), CPA, respectively.68.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), CPA, respectively.

69. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2- Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CeO2(+), respectively.70.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2- Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CeO2(+), respectively.

71. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2- Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(+), CPA, respectively.72.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2- Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(+), CPA, respectively.

73. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), respectively.74.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), respectively.

75. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), CPA, respectively.76.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), CPA, respectively.

77. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA and Ca(OH)2- Ce(NO3)36H2O, NaH2PO4, respectively.78.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA and Ca(OH)2- Ce(NO3)36H2O, NaH2PO4, respectively.

79. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2- Ce(NO3)36H2O, NaH2PO4and CPA, respectively.80.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2- Ce(NO3)36H2O, NaH2PO4and CPA, respectively.

81. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), respectively.82.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), respectively.

83. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), CPA, respectively.84.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), CPA, respectively.

85. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(-), respectively.86.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2- Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(-), respectively.

87. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2- Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(-), CPA, respectively.88.A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2- Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA and CeO2(-), CPA, respectively.

89. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2and NaH2PO4, respectively.90.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2and NaH2PO4, respectively.

91. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.92.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

93. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA and Ca(OH)2-Ce(NO3)36H2O, NaH2PO4, respectively.94.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

95. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.96.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4and CPA, respectively.

97. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2and NaH2PO4, respectively.98.A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2and NaH2PO4, respectively.

99. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

100. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

101. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

102. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)36H2O and NaH2PO4, respectively.

103. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

104. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

105. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), CeO2(-), respectively.

106. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(+), CeO2(-), respectively.

107. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-) and CPA, respectively.

108. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-) and CPA, respectively.

109. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4, CPA and CeO2(+), CeO2(-), respectively.

110. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4, CPA and CeO2(+), CeO2(-), respectively.

111. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-) and CPA, respectively.

112. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-) and CPA, respectively.

113. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), CeO2(+), respectively.

114. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA and CeO2(-), CeO2(+), respectively.

115. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+) and CPA, respectively.

116. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+) and CPA, respectively.

117. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4, CPA and CeO2(-), CeO2(+), respectively.

118. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)36H2O, NaH2PO4, CPA and CeO2(-), CeO2(+), respectively.

119. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+) and CPA, respectively.

120. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+) and CPA, respectively.

121. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA and CeO2(+), nanoHAP, respectively.

122. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA and CeO2(+), nanoHAP, respectively.

123. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), nanoHAP, CeO2(+), nanoHAP, CeO2(+), nanoHAP and CeO2(+), nanoHAP, respectively.

124. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), nanoHAP, CeO2(+), nanoHAP, CeO2(+), nanoHAP and CeO2(+), nanoHAP, respectively.

125. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CPA, nanoHAP, CPA, CeO2(+), CPA, nanoHAP, CPA, CeO2(+), CPA, nanoHAP, CPA and CeO2(+), CPA, nanoHAP, respectively.

126. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CPA, nanoHAP, CPA, CeO2(+), CPA, nanoHAP, CPA, CeO2(+), CPA, nanoHAP, CPA and CeO2(+), CPA, nanoHAP, respectively.

127. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CPA, nanoHAP, CeO2(+), CPA, nanoHAP, CeO2(+), CPA, nanoHAP and CeO2(+), CPA, nanoHAP, respectively.

128. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CPA, nanoHAP, CeO2(+), CPA, nanoHAP, CeO2(+), CPA, nanoHAP and CeO2(+), CPA, nanoHAP, respectively.

129. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), nanoHAP, CPA, CPA, CeO2(+), nanoHAP, CPA, CPA, CeO2(+), nanoHAP, CPA, CPA and CeO2(+), nanoHAP, CPA, respectively.

130. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), nanoHAP, CPA, CPA, CeO2(+), nanoHAP, CPA, CPA, CeO2(+), nanoHAP, CPA, CPA and CeO2(+), nanoHAP, CPA, respectively.

131. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA and CeO2(+), nanoHAP, CPA, respectively.

132. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA, CeO2(+), nanoHAP, CPA and CeO2(+), nanoHAP, CPA, respectively.

133. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA and CeO2(-), nanoHAP, respectively.

134. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA and CeO2(-), nanoHAP, respectively.

135. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), nanoHAP, CeO2(-), nanoHAP, CeO2(-), nanoHAP and CeO2(-), nanoHAP, respectively.

136. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), nanoHAP, CeO2(-), nanoHAP, CeO2(-), nanoHAP and CeO2(-), nanoHAP, respectively.

137. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA, nanoHAP, CPA and CeO2(-), CPA, nanoHAP, respectively.

138. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA, nanoHAP, CPA, CeO2(-), CPA, nanoHAP, CPA and CeO2(-), CPA, nanoHAP, respectively.

139. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CPA, nanoHAP, CeO2(-), CPA, nanoHAP, CeO2(-), CPA, nanoHAP and CeO2(-), CPA, nanoHAP, respectively.

140. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CPA, nanoHAP, CeO2(-), CPA, nanoHAP, CeO2(-), CPA, nanoHAP and CeO2(-), CPA, nanoHAP, respectively.

141. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), nanoHAP, CPA, CPA, CeO2(-), nanoHAP, CPA, CPA, CeO2(-), nanoHAP, CPA, CPA and CeO2(-), nanoHAP, CPA, respectively.

142. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), nanoHAP, CPA, CPA, CeO2(-), nanoHAP, CPA, CPA, CeO2(-), nanoHAP, CPA, CPA and CeO2(-), nanoHAP, CPA, respectively.

143. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA and CeO2(-), nanoHAP, CPA, respectively.

144. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA, CeO2(-), nanoHAP, CPA and CeO2(-), nanoHAP, CPA, respectively.

145. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), nanoHAP, CPA, CeO2(+), CeO2(-), nanoHAP, CPA and CeO2(+), CeO2(-), nanoHAP, respectively.

146. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), nanoHAP, CPA, CeO2(+), CeO2(-), nanoHAP, CPA and CeO2(+), CeO2(-), nanoHAP, respectively.

147. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), nanoHAP, CeO2(+), CeO2(-), nanoHAP and CeO2(+), CeO2(-), nanoHAP, respectively.

148. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), nanoHAP, CeO2(+), CeO2(-), nanoHAP and CeO2(+), CeO2(-), nanoHAP, respectively.

149. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), nanoHAP, CPA, CeO2(-), CeO2(+), nanoHAP, CPA and CeO2(-), CeO2(+), nanoHAP, respectively.

150. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), nanoHAP, CPA, CeO2(-), CeO2(+), nanoHAP, CPA and CeO2(-), CeO2(+), nanoHAP, respectively.

151. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), nanoHAP, CeO2(-), CeO2(+), nanoHAP and CeO2(-), CeO2(+), nanoHAP, respectively.

152. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), nanoHAP, CeO2(-), CeO2(+), nanoHAP and CeO2(-), CeO2(+), nanoHAP, respectively.

153. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4, CPA and h-BN(-), Ca(OH)2, NaH2PO4, respectively.

154. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4, CPA and h-BN(-), Ca(OH)2, NaH2PO4, respectively.

155. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4, CPA and h-BN(-), Ca(OH)2, NaH2PO4, CPA, respectively.

156. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h-BN(-), Ca(OH)2, NaH2PO4, CPA, h-BN(-), Ca(OH)2, NaH2PO4, CPA and h-BN(-), Ca(OH)2, NaH2PO4, CPA, respectively.

157. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(- ), CPA, Ca(OH)2, NaH2PO4, CPA and h-BN(-), respectively.

158. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(- ), CPA, Ca(OH)2, NaH2PO4, CPA and h-BN(-), respectively.

159. A coating according to claim 4, comprising, on an undried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(- ), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, respectively.

160. A coating according to claim 4, comprising, on a dried first CPA layer, the layers Ca(OH)2, NaH2PO4, CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(- ), CPA, Ca(OH)2, NaH2PO4, CPA and h-BN(-), respectively.

161. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA and Ca(OH)2, NaH2PO4, respectively.

162. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA and Ca(OH)2, NaH2PO4, respectively.

163. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

164. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

165. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively.

166. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively.

167. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

168. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(-), CeO2(+), h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

169. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA and Ca(OH)2, NaH2PO4, respectively.

170. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA and Ca(OH)2, NaH2PO4, respectively.

171. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

172. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

173. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively.

174. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O and NaH2PO4, respectively.

175. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

176. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4and CPA, respectively.

177. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2and NaH2PO4, respectively.

178. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2and NaH2PO4, respectively.

179. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

180. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2, NaH2PO4and CPA, respectively.

181. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2- Ce(NO3)36H2O and NaH2PO4, respectively.

182. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2- Ce(NO3)36H2O and NaH2PO4, respectively.

183. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2- Ce(NO3)36H2O, NaH2PO4and CPA, respectively.

184. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2-Ce(NO3)3-6H2O, NaH2PO4, CPA, CeO2(+), CeO2(-), CPA, h-BN(-), CPA, Ca(OH)2- Ce(NO3)36H2O, NaH2PO4and CPA, respectively.

185. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP, CPA, CeO2(-), CeO2(+), h- BN(-), CPA and nanoHAP, respectively.

186. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP, CPA, CeO2(-), CeO2(+), h- BN(-), CPA and nanoHAP, respectively.

187. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP, CPA, CeO2(-), CeO2(+), h- BN(-), CPA, nanoHAP and CPA, respectively.

188. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), h-BN(-), CPA, nanoHAP, CPA, CeO2(-), CeO2(+), h- BN(-), CPA, nanoHAP and CPA, respectively.

189. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP, CPA, h-BN(-), CeO2(+), CeO2(-), CPA and nanoHAP, respectively.

190. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP, CPA, h-BN(-), CeO2(+), CeO2(-), CPA and nanoHAP, respectively.

191. A coating according to claim 4, comprising, on an undried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP and CPA, respectively.

192. A coating according to claim 4, comprising, on a dried first CPA layer, the layers h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP, CPA, h-BN(-), CeO2(+), CeO2(-), CPA, nanoHAP and CPA, respectively.

193. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-) and CeO2(+), respectively.

194. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-) and CeO2(+), respectively.

195. A coating according to claim 4, comprising, on an undried first CPA layer, the layers CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+) and CPA, respectively.

196. A coating according to claim 4, comprising, on a dried first CPA layer, the layers CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+), CeO2(-), CeO2(+) and CPA, respectively.

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