Resin composition and coating

Abstract

Embodiments of the present application provide a resin composition and a coating. The resin composition comprises an acrylate oligomer, a reactive unsaturated monomer, water-absorbing powder, and a photoinitiator. The resin composition can form, by means of photocuring, a coating having both good water absorption and good wear resistance, has high curing efficiency, and can form stable bonding with different inorganic or organic substrates. The coating is used in a water-blocking strip for an optical cable, such that the water-blocking strip can durably have good water absorption and wear resistance by means of simple coating and photocuring operations, thereby improving the service reliability of the optical cable.

Description

Resin composition and coating

[0001] The present application claims priority to the Chinese patent application No. 202410851980.X filed on June 27, 2024, and entitled "Resin composition and coating", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the technical field of curable resin, in particular to a resin composition and coating. BACKGROUND

[0003] With the rapid development of the communication industry, the optical cable line inevitably passes through humid environments such as water areas, wetlands and underground. When water enters the optical cable, it will cause absorption loss, increase the total attenuation of the channel, and even interrupt the communication transmission. In order to prevent water from penetrating into the optical cable, the industry often uses grease or water-blocking tape materials to fill the optical cable to improve the water-blocking performance of the optical cable. However, the grease filling brings many inconveniences and defects to the processing process and construction application of the optical cable, and still cannot better meet the water-blocking requirements of the optical cable; and the existing water-blocking tape materials (such as water-blocking glass yarns), considering the actual application requirements of the optical cable, need to have good water absorption and wear resistance, and currently a coating is prepared on the tape material by using a thermal curing process to achieve this, but there are problems such as high energy consumption, serious environmental pollution, and slow processing speed, so it is currently difficult to make the water-blocking tape material have long-term good water absorption and wear resistance through a simple and efficient process. SUMMARY

[0004] In view of this, the embodiments of the present application provide a resin composition and coating, the resin composition can form a coating with good water absorption and wear resistance by photocuring, and can form a stable combination with various substrates; when used in a water-blocking tape material for optical cables, the water-blocking tape material can have long-term good water absorption and wear resistance through simple coating and photocuring operations, and the service reliability of the optical cable is improved.

[0005] In a first aspect, the embodiments of the present application provide a resin composition, the resin composition comprises an acrylate oligomer, a reactive unsaturated monomer, a water-absorbing powder and a photoinitiator.

[0006] The resin composition provided by the embodiment of the present application is a curable resin composition, in particular, an ultraviolet (UV) light curable resin composition. The resin composition can form a coating layer with good water absorption and wear resistance through ultraviolet light curing. The resin composition has high curing efficiency and can form a stable bond with various inorganic or organic substrates. When the resin composition is used in a water-blocking tape for an optical cable, the water-blocking tape can have good water absorption and wear resistance for a long time through simple coating and light curing operation, thereby improving the service reliability of the optical cable. Compared with a heat-cured resin composition, the ultraviolet (UV) light curable resin composition of the embodiment of the present application can greatly improve the curing reaction speed, improve the production capacity, reduce the processing energy consumption, reduce the cost, simplify the equipment and the occupied space, and avoid the corresponding steam suction and discharge caused by heat curing.

[0007] In some embodiments of the present application, the mass percentage of the acrylate oligomer in the resin composition is 1% to 60%; and / or, the mass percentage of the reactive unsaturated monomer is 5% to 80%; and / or, the mass percentage of the water absorption powder is 2% to 50%; and / or, the mass percentage of the photoinitiator is 0.5% to 10%. In the resin composition, each component is kept at a suitable amount, which is beneficial to curing to obtain a coating layer with high curing efficiency, good curing effect, and good water absorption and wear resistance. The addition of a suitable amount of water absorption powder can make the resin composition have relatively high light curing efficiency, and can improve the water absorption and water blocking performance of the coating layer obtained after curing of the resin composition, while making the coating layer better combined with the substrate to obtain a suitable light transmittance, hardness, and wear resistance.

[0008] In the embodiment of the present application, the acrylate oligomer includes acrylate and / or modified acrylate, and the modified acrylate includes one or more of polyurethane acrylate, epoxy acrylate, polyester acrylate, and polyether acrylate. The acrylate oligomer, also known as acrylate prepolymer, is the base resin of the light curable resin composition and constitutes the basic skeleton of the cured product.

[0009] In the embodiment of the present application, the number average molecular weight Mn of the acrylate oligomer is 1000 to 100,000, and the viscosity of the acrylate oligomer at 60°C is 0 to 20,000 mPa·s. The acrylate oligomer with a relatively low molecular weight has a relatively low viscosity, which is beneficial to the preparation of the resin composition and the subsequent coating and curing to form a coating layer with uniform and good performance.

[0010] In the embodiments of the present application, the water-absorbing powder includes one or more of starch-based water-absorbing powder, cellulose-based water-absorbing powder, and synthetic polymer-based water-absorbing powder. By adding the water-absorbing powder to the resin composition, the water-absorbing and water-blocking performance of the coating obtained after curing of the resin composition can be improved. The starch-based water-absorbing powder can be modified or unmodified starch, and the modified starch can be, for example, acrylate, acrylonitrile, acrylamide, or styrene sulfonic acid modified starch. The cellulose-based water-absorbing powder can be modified or unmodified cellulose or sodium cellulose, and the modified cellulose or sodium cellulose can be, for example, acrylate, acrylonitrile, or acrylamide modified cellulose or sodium cellulose.

[0011] In the embodiments of the present application, the synthetic polymer-based water-absorbing powder includes one or more of polyacrylate and polyacrylamide.

[0012] In the embodiments of the present application, the D50 particle size of the water-absorbing powder is less than 1000 microns. The water-absorbing powder has a small particle size, which is beneficial to its uniform dispersion in the resin composition and improves the uniformity of water absorption of the coating obtained after curing of the resin composition. D50 is the particle size corresponding to the cumulative particle size distribution percentage of 50% of a sample. Its physical meaning is that the particles with a particle size greater than it account for 50%, and the particles with a particle size less than it also account for 50%. D50 is also called median diameter or median particle size.

[0013] In the embodiments of the present application, the D50 particle size of the water-absorbing powder is less than 20 microns, which is a superfine water-absorbing powder. By using a superfine water-absorbing powder with a small particle size, the water-absorbing performance of the coating obtained after curing of the resin composition can be improved under the condition of the same mass ratio of the superfine water-absorbing powder. A small particle size can also better ensure the uniformity and transparency of the coating obtained after curing of the resin composition to meet the application scenarios with high visible light transmittance requirements. A small particle size can also enable the coating to have higher hardness and adhesion to the substrate.

[0014] In the embodiments of the present application, the photoinitiator includes Norrish Type I photoinitiator and / or Norrish Type II photoinitiator. The Norrish Type I photoinitiator is a cleavage-type photoinitiator, and the Norrish Type II photoinitiator is a hydrogen abstraction-type photoinitiator. In some embodiments, the photoinitiator only includes Norrish Type I photoinitiator; in some embodiments, the photoinitiator only includes Norrish Type II photoinitiator. In some embodiments, the photoinitiator includes both Norrish Type I photoinitiator and Norrish Type II photoinitiator. The use of a combination of Norrish Type I photoinitiator and Norrish Type II photoinitiator is beneficial to the simultaneous curing of the surface layer and the deep layer of the coating, shortens the curing time, improves the curing effect, and improves the adhesion and surface wear resistance of the coating.

[0015] In the embodiments of the present application, the mass ratio of the Norrish Type I photoinitiator to the Norrish Type II photoinitiator is 0.1-10:1. Controlling the two types of photoinitiators at a suitable mass ratio is advantageous for better improving the effect of simultaneous curing of the surface layer and the deep layer, improving the curing speed and processing efficiency, and solving the problems of incomplete curing of the surface layer and the deep layer of the coating, tackiness of the coating surface, and insufficient adhesion of the coating to the substrate surface.

[0016] In the embodiments of the present application, the photoinitiator includes one or more of phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide, (2,4,6-trimethylbenzoyl) diphenyl phosphine oxide (TPO), phenyl (2,4,6-trimethylbenzoyl) phosphinic acid ethyl ester, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)-1-butanone, 2-isopropylthioxanthone, 2,4-diethylthioxanthone, Esacure 3644, 4,4'-bis(diethylamino) benzophenone, Guangchuang Electronics GC-3704, Guangchuang Electronics GC-1005, 4-(dimethylamino) benzoic acid (2-butoxyethyl) ester, 2-(dimethylamino) ethyl benzoate, ethyl p-dimethylaminobenzoate, and 4,4'-di(N,N-diethylamino) benzophenone.

[0017] In the embodiments of the present application, the resin composition can be cured under ultraviolet light irradiation, and the curing time is less than or equal to 30s. The resin composition can achieve rapid curing under ultraviolet light irradiation, which can improve the processing efficiency.

[0018] In the embodiments of the present application, the reactive unsaturated monomer includes one or more of a vinyl monomer and an acrylate monomer.

[0019] In the embodiments of the present application, the vinyl monomer includes one or more of styrene and N-vinyl pyrrolidone.

[0020] The acrylate monomer includes one or more of a monofunctional monomer, a bifunctional monomer, and a multifunctional monomer.

[0021] The monofunctional monomer includes one or more of acrylic acid, methyl acrylate, ethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, monofunctional polyethylene glycol acrylate, hydroxyethyl acrylate, carboxyethyl acrylate, 2-hydroxyethyl methacrylate, sodium acrylsulfonate, sodium methacrylsulfonate, sodium 2-acrylamido-2-methylpropane sulfonate (AMPS), maleic anhydride, maleic acid, fumaric acid, beta-hydroxyethyl methacrylate (HEMA), isobornyl acrylate (IBOA), beta-carboxyethyl acrylate (beta-CEA), 2-phenoxyethyl acrylate;

[0022] The difunctional monomer includes one or more of ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, polyethylene glycol diacrylate with Mn<400, 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, N,N'-methylenebisacrylamide.

[0023] The multifunctional monomer includes one or more of pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate.

[0024] In the embodiments of the present application, the resin composition further includes an auxiliary agent. The addition of the auxiliary agent can improve the performance of the resin composition. The auxiliary agent can be one or more of an antistatic agent, a lubricant, an inorganic filler, a lubricant, a coupling agent, and the like, and can be added according to actual needs. The mass percentage of the auxiliary agent in the resin composition is 1% to 20%.

[0025] The second aspect of the embodiments of the present application provides a preparation method of the resin composition of the first aspect, which includes:

[0026] The acrylate oligomer, the reactive unsaturated monomer, the water absorption powder, and the photoinitiator are uniformly mixed to obtain the resin composition.

[0027] The preparation method of the resin composition provided by the embodiments of the present application is simple.

[0028] The third aspect of the embodiments of the present application provides a coating layer, which includes a cured product of the resin composition of the first aspect of the embodiments of the present application, or includes an acrylate resin matrix and a water absorption powder distributed in the acrylate resin matrix. The coating layer has good water absorption and wear resistance, and can be arranged on various substrates such as polymers, glass, glass fibers, polyester, aramid, basalt fibers, liquid crystal polymers (LCP), fiber woven fabrics, and the like, to protect the substrates and improve the water absorption and wear resistance of the substrates. By being arranged on the surfaces of different substrates, the coating layer can be applied to various application scenarios.

[0029] In the embodiment of the present application, the water-absorbing powder is uniformly distributed in the coating, and the water absorption of the coating 30s is greater than 5 g / g; the water absorption of the coating 5 min is greater than 6 g / g. The coating has a high water absorption in a short time, that is, it has good water absorption and high water absorption rate, and can better achieve water resistance and waterproofness. The water absorption of the coating can be measured by the weight difference before and after the coating absorbs water for a certain period of time.

[0030] In the embodiment of the present application, the pencil hardness of the coating is greater than or equal to 2H. The coating has a high pencil hardness, indicating that the surface of the coating is resistant to scratching and has good wear resistance. The pencil hardness of the coating can be tested according to the standards of GB / T 6739, ISO 15184 and ASTM D 3363.

[0031] In the embodiment of the present application, the coating is attached to the substrate, and the adhesion of the coating to the surface of the substrate is greater than or equal to 2B. The coating has a high adhesion to the surface of the substrate and is not easy to fall off, so that the substrate surface can have long-term good water absorption and wear resistance. The adhesion of the coating to the surface of the substrate can be tested according to the standard of ISO 2409.

[0032] In the embodiment of the present application, the coating is a transparent coating, and the visible light transmittance of the coating at 530 nm is greater than 80%. The coating has a high visible light transmittance, which can better meet the application scenarios with high transmittance requirements. The visible light transmittance of the coating can be tested by using a light transmittance instrument or a light transmittance meter.

[0033] The fourth aspect of the embodiment of the present application provides a preparation method of a coating, comprising:

[0034] The resin composition of the first aspect of the embodiment of the present application is coated on a substrate and cured under ultraviolet light irradiation to obtain a coating.

[0035] The preparation of the coating of the embodiment of the present application is simple and time-saving, which is beneficial to improving the processing efficiency.

[0036] The fifth aspect of the embodiment of the present application provides a component with a coating, which comprises a substrate and a coating provided on the substrate, and the coating comprises the coating of the third aspect of the embodiment of the present application. The component with the coating of the present application can better protect the substrate, improve the waterproof and water resistance performance and wear resistance of the surface of the substrate, and the coating is firmly attached to the surface of the substrate and is not easy to fall off, which can improve the long-term service reliability of the component with the coating.

[0037] In the embodiments of the present application, the substrate includes one or more of a polymer, glass, glass fiber, polyester, aramid, basalt fiber, liquid crystal polymer (LCP), and fiber weave.

[0038] In the embodiments of the present application, the member with a coating includes an optical cable strength member. In an embodiment, the optical cable strength member can specifically be an optical cable strength member including glass fiber and a coating disposed on the surface of the glass fiber.

[0039] The embodiments of the present application also provide a cable including the member with a coating according to the fifth aspect of the embodiments of the present application. The cable uses the member with a coating according to the embodiments of the present application, and the waterproof performance and the like can be improved. The cable can be an optical cable or an electrical cable. BRIEF DESCRIPTION OF DRAWINGS

[0040] FIG. 1 is a structural schematic diagram of a member with a coating 100 according to the embodiments of the present application. DETAILED DESCRIPTION

[0041] The embodiments of the present application will be described below with reference to the accompanying drawings.

[0042] In order to prevent moisture from penetrating into the optical cable and affecting signal transmission, the industry often uses grease or water-blocking tape materials to fill the optical cable to improve the water-blocking performance of the optical cable. However, the grease filling brings many inconveniences and defects to the processing process and construction application of the optical cable, and still cannot better meet the water-blocking requirements of the optical cable; and the existing water-blocking tape materials (such as water-blocking glass yarns), considering the actual application requirements of the optical cable, need to have good water absorption and wear resistance, but it is currently difficult to make the water-blocking tape material have long-term good water absorption and wear resistance through a simple and efficient process. In view of this, the embodiments of the present application provide a resin composition which can form a coating with good water absorption and wear resistance through photocuring, and can form a stable combination with various substrates; when used in a water-blocking tape material for an optical cable, the water-blocking tape material can have long-term good water absorption and wear resistance through a simple coating and photocuring operation, and the service reliability of the optical cable is improved.

[0043] The embodiments of the present application provide a resin composition including an acrylate oligomer, a reactive unsaturated monomer, a water-absorbing powder, and a photoinitiator.

[0044] The resin composition provided by the embodiments of the present application is a curable resin composition, in particular, an ultraviolet (UV) light curable resin composition. The resin composition can form a coating layer with good water absorption and wear resistance through ultraviolet light curing. The resin composition has high curing efficiency and can form a stable bond with various inorganic or organic substrates. When the resin composition is used in a water-blocking tape for an optical cable, the water-blocking tape can have good water absorption and wear resistance for a long time through simple coating and light curing operations, thereby improving the service reliability of the optical cable. Compared with a heat-cured resin composition, the ultraviolet (UV) light curable resin composition of the embodiments of the present application can greatly improve the curing reaction speed, improve the production capacity, reduce the processing energy consumption, reduce the cost, simplify the equipment and the occupied space, and avoid the corresponding steam suction and discharge caused by heat curing.

[0045] In the embodiments of the present application, the acrylate oligomer, also referred to as an acrylate prepolymer, is a base resin of the light curable resin composition and constitutes the basic skeleton of the cured product. The acrylate oligomer can be an acrylate and / or a modified acrylate and can be commercially available or self-prepared. The modified acrylate can be one or more of polyurethane acrylate, epoxy acrylate, polyester acrylate, polyether acrylate, and other modified acrylate oligomers. For example, the acrylate oligomer can be commercially available Jiangsu Shunsheng SS-6, Baorun Chemical 2023A, iLENE 2292H, iLENE 246, and the like. The polyether acrylate can include polyethylene glycol acrylate and the like. In some embodiments, the acrylate oligomer includes an aqueous acrylate oligomer, which uses water as a solvent and is more environmentally friendly and convenient to use. The aqueous acrylate oligomer can be in the form of an emulsion, a water dispersion, or a water solution.

[0046] In the embodiments of the present application, the number average molecular weight Mn of the acrylate oligomer is 1000-100,000. The acrylate oligomer has a relatively low molecular weight, which can make it have a relatively low viscosity, thereby being conducive to the preparation of the resin composition and the subsequent coating and curing to form a coating layer with uniform and good performance. In some embodiments, the number average molecular weight Mn of the acrylate oligomer can be, for example, 1000, 2000, 3000, 4000, 5000, 8000, 10,000, 20,000, 50,000, 60,000, 80,000, or 100,000.

[0047] In some embodiments, the acrylate oligomer has a viscosity of 0-20000 mPa.s at 60 °C. The acrylate oligomer has a relatively low viscosity, which is beneficial for the formulation of the resin composition and the subsequent coating and curing to form a coating with uniform and good performance. In some embodiments, the acrylate oligomer has a viscosity of 0 mPa.s, 1 mPa.s, 5 mPa.s, 10 mPa.s, 20 mPa.s, 50 mPa.s, 100 mPa.s, 500 mPa.s, 1000 mPa.s, 1500 mPa.s, 2000 mPa.s, 3000 mPa.s, 5000 mPa.s, 10000 mPa.s, 15000 mPa.s, 20000 mPa.s at 60 °C.

[0048] The acrylate oligomer and the reactive unsaturated monomer are the main components in the resin composition. In the subsequent photocuring process, the reactive unsaturated monomer and the acrylate oligomer undergo polymerization and crosslinking under the action of a free radical initiator to achieve curing, and the two account for most of the weight of the resin composition. In the present application, the mass percentage of the acrylate oligomer in the resin composition is 1%-60%. For example, the mass percentage of the acrylate oligomer in the resin composition is 1%, 3%, 5%, 8%, 10%, 12%, 15%, 20%, 30%, 40%, 50%, 60%. In some embodiments, the mass percentage of the acrylate oligomer in the resin composition is 10%-40%.

[0049] In some embodiments of the present application, the reactive unsaturated monomer contains unsaturated double bonds and can be one or more of a vinyl monomer and an acrylate monomer.

[0050] In some embodiments of the present application, the vinyl monomer, i.e. the ethylene monomer, contains a vinyl group and can be, but is not limited to, one or more of styrene, N-vinyl pyrrolidone. Under the action of a photoinitiator, the unsaturated double bonds in the vinyl monomer will open to allow the polymerization reaction to proceed.

[0051] In some embodiments of the present application, the acrylate monomer includes one or more of a monofunctional monomer, a bifunctional monomer, and a multifunctional monomer. Each molecule of the monofunctional monomer contains only one group that can participate in the photocuring reaction. Each molecule of the bifunctional monomer contains two groups that can participate in the photocuring reaction. Each molecule of the multifunctional monomer contains more than two (e.g. three, four) groups that can participate in the photocuring reaction. The acrylate monomer in the resin composition can be one or more of a monofunctional monomer, and / or one or more of a bifunctional monomer, and / or one or more of a multifunctional monomer. The acrylate monomer is readily available and relatively low in price, which is beneficial for reducing costs.

[0052] In some embodiments of the present application, the monofunctional monomer can be, but is not limited to, one or more of acrylic acid, methyl acrylate, ethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, monofunctional polyethylene glycol acrylate, hydroxyethyl acrylate, carboxyethyl acrylate, 2-hydroxyethyl methacrylate, sodium acryl sulfonate, sodium methacryl sulfonate, sodium 2-acrylamido-2-methylpropane sulfonate (AMPS), maleic anhydride, maleic acid, fumaric acid, beta-hydroxyethyl methacrylate (HEMA), isobornyl acrylate (IBOA), beta-carboxyethyl acrylate (beta-CEA), 2-phenoxyethyl acrylate.

[0053] In some embodiments of the present application, the difunctional monomer can be, but is not limited to, one or more of ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, polyethylene glycol diacrylate with Mn < 400, 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, N,N'-methylenebisacrylamide. The polyethylene glycol diacrylate with Mn < 400 is a polyethylene glycol diacrylate with a number average molecular weight Mn < 400, for example, can be a polyethylene glycol diacrylate with Mn of 100, 200, 300, 350.

[0054] In some embodiments of the present application, the multifunctional monomer can be, but is not limited to, one or more of pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate.

[0055] In some embodiments of the present application, the acrylate monomer is a water-soluble non-toxic acrylate monomer, which is more environmentally friendly.

[0056] In some embodiments of the present application, the mass percentage of the reactive unsaturated monomer in the resin composition is 5% to 80%. For example, the mass percentage of the reactive unsaturated monomer in the resin composition is 5%, 8%, 10%, 12%, 15%, 20%, 30%, 40%, 50%, 55%, 60%, 70%, 75%, 80%. In some embodiments, the mass percentage of the reactive unsaturated monomer in the resin composition is 50% to 80%.

[0057] In some embodiments of the present application, in the resin composition, the acrylate oligomer and the reactive active monomer can be added in a mass ratio of 1-40:60-99, based on 100 parts of the total mass. For example, the mass ratio of the acrylate oligomer and the reactive active monomer can be 10:90, 15:85, 20:80, 25:75, 30:70, 40:60.

[0058] By adding water-absorbing powder into the resin composition, the water absorption and water blocking performance of the coating obtained after curing of the resin composition can be improved. In the embodiments of the present application, the water-absorbing powder can be one or more of starch-based water-absorbing powder, cellulose-based water-absorbing powder, and synthetic polymer-based water-absorbing powder. Among them, the starch-based water-absorbing powder can be modified or unmodified starch, wherein the modified starch can be, for example, acrylate, acrylonitrile, acrylamide or styrene sulfonic acid modified starch. The cellulose-based water-absorbing powder can be modified or unmodified cellulose or sodium cellulose, wherein the modified cellulose or sodium cellulose can be, for example, acrylate, acrylonitrile or acrylamide modified cellulose or sodium cellulose. Among them, the acrylate can be, for example, sodium acrylate. Compared with synthetic polymer-based water-absorbing powder, natural polymer water-absorbing powder such as starch and cellulose is more environmentally friendly. Compared with natural polymer water-absorbing powder, synthetic polymer-based water-absorbing powder can obtain higher water absorption and better water retention capacity, especially under pressure.

[0059] In the embodiments of the present application, the synthetic polymer-based water-absorbing powder can be one or more of polyacrylate, polyacrylamide, acrylate-acrylamide copolymer, etc. Among them, the polyacrylate can be polyacrylate sodium.

[0060] In the embodiments of the present application, the D50 particle size of the water-absorbing powder is less than 1000 microns. The water-absorbing powder has a smaller particle size, which is beneficial to its uniform dispersion in the resin composition and improves the uniformity of the coating obtained after curing of the resin composition. For example, the D50 particle size of the water-absorbing powder can be 1 micron, 2 microns, 5 microns, 10 microns, 12 microns, 15 microns, 18 microns, 20 microns, 30 microns, 50 microns, 100 microns, 150 microns, 200 microns, 300 microns, 400 microns, 500 microns, 600 microns, 700 microns, 900 microns, 990 microns. D50 is the particle size corresponding to the cumulative particle size distribution percentage of 50% of a sample. Its physical meaning is that the particles with a particle size greater than it account for 50%, and the particles with a particle size less than it also account for 50%. D50 is also called median diameter or median particle size.

[0061] In some embodiments of the present application, the D50 particle size of the water-absorbing powder is less than 20 microns, which is a superfine water-absorbing powder. By using a superfine water-absorbing powder with a smaller particle size, the water absorption performance of the coating obtained after curing of the resin composition can be improved under the condition of the same mass ratio of the superfine water-absorbing powder. Smaller particle size can also better ensure the uniformity and transparency of the coating obtained after curing of the resin composition to meet the application scenarios with higher visible light transmittance requirements. Smaller particle size can also enable the coating to have higher hardness and adhesion to the substrate.

[0062] In some embodiments, the resin composition includes 2-50% by mass of the water absorption powder. For example, the resin composition includes 2%, 4%, 5%, 8%, 10%, 12%, 15%, 20%, 25%, 30%, 40%, or 50% by mass of the water absorption powder. In some embodiments, the resin composition includes 4-20% by mass of the water absorption powder. The addition of the water absorption powder in a suitable amount can allow the resin composition to have relatively high photocuring efficiency, and can allow the coating obtained after curing of the resin composition to have improved water absorption and water blocking performance, and to have better adhesion to the substrate, suitable light transmittance, hardness, and wear resistance.

[0063] The photoinitiator is also known as a photosensitizer or a photocuring agent, and is a compound that can absorb energy of a certain wavelength in the ultraviolet region (250-420 nm) or the visible region (400-800 nm) to generate free radicals, cations, and the like, thereby initiating polymerization and crosslinking of monomers. In some embodiments, the photoinitiator is an ultraviolet photoinitiator that can absorb light in the ultraviolet region. The ultraviolet light has a short wavelength, and the use of ultraviolet light for curing is conducive to obtaining higher curing speed and curing effect. In some embodiments, the photoinitiator includes an ultraviolet photoinitiator suitable for 365 nm-405 nm wavelength UV LED curing. Traditional light sources such as mercury lamps have the disadvantages of short service life, ozone release, low efficiency, and mercury vapor being harmful to human health. The use of light-emitting diodes (LEDs) has the advantages of high energy efficiency, environmental protection, and long service life.

[0064] In some embodiments, the photoinitiator includes a free radical photoinitiator, which can include a Norrish I type photoinitiator and / or a Norrish II type photoinitiator. The Norrish I type photoinitiator is a cleavage type photoinitiator, and the Norrish II type photoinitiator is a hydrogen abstraction type photoinitiator. In some embodiments, the photoinitiator includes only the Norrish I type photoinitiator. In some embodiments, the photoinitiator includes only the Norrish II type photoinitiator.

[0065] In some embodiments, the photoinitiator is a Norrish Type I photoinitiator. In some embodiments, the photoinitiator is a Norrish Type II photoinitiator. In some embodiments, the photoinitiator is a combination of a Norrish Type I photoinitiator and a Norrish Type II photoinitiator. In some embodiments, the photoinitiator is a combination of a Norrish Type I photoinitiator and a Norrish Type II photoinitiator in a mass ratio of 0.1-10:1. In some embodiments, the photoinitiator is a combination of a Norrish Type I photoinitiator and a Norrish Type II photoinitiator in a mass ratio of 0.1:1, 0.3:1, 0.5:1, 0.5:1, 0.6:1, 1:1, 1.2:1, 1.5:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, or 10:1. In some embodiments, the photoinitiator is a combination of a Norrish Type I photoinitiator and a Norrish Type II photoinitiator in a mass ratio of 0.6-3:1.

[0066] In some embodiments, the photoinitiator is one or more of phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide, (2,4,6-trimethylbenzoyl) diphenyl phosphine oxide (TPO), phenyl (2,4,6-trimethylbenzoyl) phosphinic acid ethyl ester, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)-1-butanone, 2-isopropylthioxanthone (ITX), 2,4-diethylthioxanthone, Esacure 3644, 4,4'-bis(diethylamino) benzophenone, Guangchuang Electronics GC-3704, Guangchuang Electronics GC-1005, 4-(dimethylamino) benzoic acid (2-butoxyethyl) ester, benzoic acid 2-(dimethylamino) ethyl ester, ethyl p-dimethylaminobenzoate, 4,4'-di(N,N-diethylamino) benzophenone.

[0067] In some embodiments, the resin composition is curable under ultraviolet light irradiation. Specifically, the photoinitiator absorbs ultraviolet light of a specific wavelength under ultraviolet light irradiation and becomes a highly active free radical. These free radicals initiate the polymerization and crosslinking of the acrylate oligomer and the reactive monomer, causing the liquid resin composition to change into a solid state, thereby obtaining a cured coating.

[0068] In some embodiments, the resin composition can be cured under UV irradiation in less than or equal to 30 seconds. In some embodiments, the resin composition can be cured in less than or equal to 5 seconds. In some embodiments, the resin composition can be cured in 3 seconds, 4 seconds, 5 seconds, 6 seconds, 7 seconds, 8 seconds, 9 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds, or 30 seconds.

[0069] In some embodiments, the resin composition can include 0.5% to 10% of the photoinitiator by mass percentage. For example, the resin composition can include 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10% of the photoinitiator by mass percentage. In some embodiments, the resin composition can include 2% to 8% of the photoinitiator by mass percentage. The addition of the photoinitiator in an appropriate amount can improve the curing effect of the resin composition.

[0070] In some embodiments, the resin composition can include 1% to 60% of the acrylate oligomer, 5% to 80% of the reactive unsaturated monomer, 2% to 50% of the water-absorbing powder, and 0.5% to 10% of the photoinitiator by mass percentage. The resin composition can include each component in an appropriate amount, which is conducive to obtaining a coating layer with high curing efficiency, good curing effect, and good water absorption and wear resistance.

[0071] In some embodiments, the resin composition can further include various additives according to the functional needs of softness, lubricity, leveling, and the like. The additives can include one or more of an antistatic agent, a lubricant, an inorganic filler, and a coupling agent. The inorganic filler can include, for example, wear-resistant powder such as ceramic powder and fumed silica. The lubricant can include, but is not limited to, fatty acid monoesters (such as laurate ester) and derivatives thereof, and stearic amide and derivatives thereof.

[0072] In some embodiments, the resin composition can include 1% to 20% of the additive by mass percentage. For example, the resin composition can include 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 15%, 18%, or 20% of the additive by mass percentage. In some embodiments, the resin composition can include 1% to 5% of the additive by mass percentage. The addition of the additive in an appropriate amount can improve the coating performance of the resin composition and improve the comprehensive performance of the coating layer obtained after curing.

[0073] The present application also provides a preparation method of the resin composition, which includes the following steps:

[0074] The acrylate oligomer, the reactive unsaturated monomer, the water-absorbing powder, and the photoinitiator are uniformly mixed to obtain the resin composition.

[0075] The acrylic ester oligomer, the reactive unsaturated monomer, the water absorption powder, and the photoinitiator are uniformly mixed, and the process can include:

[0076] S1, the acrylic ester oligomer is heated to about 50°C, and then the reactive unsaturated monomer is added and uniformly mixed; the viscosity of the acrylic ester oligomer can be reduced by heating, and the uniformity of mixing can be improved;

[0077] S2, the mixture obtained in S1 is cooled to room temperature, and the water absorption powder is added and uniformly mixed;

[0078] S3, the photoinitiator is added to the mixture obtained in S2 and uniformly mixed.

[0079] In some embodiments, an additive is added during the preparation of the resin composition, that is, the acrylic ester oligomer, the reactive unsaturated monomer, the water absorption powder, the photoinitiator, and the additive are uniformly mixed. The additive can be added in the above S2 step, that is, S2 is to cool the mixture obtained in S1 to room temperature, add the water absorption powder and the additive, and uniformly mix. In the S2 step, after the mixture obtained in S1 is cooled to room temperature, the water absorption powder is added, which is beneficial to improve the effect of subsequent curing.

[0080] By mixing the different components step by step, the uniformity of mixing of each component can be improved, and the uniformity of mixing of the resin composition can be improved.

[0081] The present application also provides a coating layer, which includes the cured product of the resin composition described above in the embodiments of the present application, that is, the coating layer includes the cured product obtained after the resin composition described above is photocured. Alternatively, the coating layer includes an acrylic ester resin matrix and a water absorption powder distributed in the acrylic ester resin matrix, and the acrylic ester resin matrix can be the polymerization product of the acrylic ester oligomer and the reactive unsaturated monomer. The coating layer has good water absorption and wear resistance, and can be provided on various substrates such as polymers, glass, glass fibers, polyester, aramid, basalt fibers, liquid crystal polymers (LCP), and fiber woven fabrics, to protect the substrates and improve the water absorption and wear resistance of the substrates.

[0082] In the embodiments of the present application, the water absorption powder is uniformly distributed in the entire coating layer. In the coating layer, the mass percentage of the water absorption powder is 2% to 50%. For example, the mass percentage of the water absorption powder in the coating layer is 2%, 4%, 5%, 8%, 10%, 12%, 15%, 20%, 25%, 30%, 40%, or 50%. In some embodiments, the mass percentage of the water absorption powder in the coating layer is 4% to 20%.

[0083] In some embodiments, the coating has a 30s water absorption of greater than 5 g / g, i.e., the water absorption of the coating is greater than 5 g / g per gram of the coating in 30s. In some embodiments, the coating has a 30s water absorption of greater than 7 g / g. In some embodiments, the coating has a 30s water absorption of 7.1 g / g to 20 g / g, such as 7.1 g / g, 7.5 g / g, 8 g / g, 8.5 g / g, 9 g / g, 9.5 g / g, 10 g / g, 12 g / g, 15 g / g, 18 g / g, or 20 g / g. In some embodiments, the coating has a 5 min water absorption of greater than 6 g / g, i.e., the water absorption of the coating is greater than 6 g / g per gram of the coating in 5 min. In some embodiments, the coating has a 5 min water absorption of greater than 8 g / g. In some embodiments, the coating has a 5 min water absorption of 8 g / g to 20 g / g, such as 8.1 g / g, 8.5 g / g, 9 g / g, 9.5 g / g, 10 g / g, 12 g / g, 15 g / g, 18 g / g, or 20 g / g. The coating has a high water absorption in a short time, i.e., has a good water absorption and a high water absorption rate, and can better achieve water resistance and waterproofness. The water absorption of the coating can be measured by the weight difference before and after the coating absorbs water for a certain period of time.

[0084] In some embodiments, the coating has a pencil hardness of greater than or equal to 2H, such as 2H or 3H. The coating has a high pencil hardness, indicating that the coating surface is resistant to scratching and has good wear resistance. The pencil hardness of the coating can be tested according to GB / T 6739, ISO 15184, and ASTM D 3363 standards.

[0085] In some embodiments, the coating is attached to the substrate, and the coating has an adhesion to the substrate surface of greater than or equal to 2B, such as 2B or 3B. The coating has a high adhesion to the substrate surface and is not easy to fall off, so that the substrate surface can have long-term good water absorption and wear resistance. The adhesion of the coating to the substrate surface can be tested according to ISO 2409 standard.

[0086] In some embodiments, the coating is a transparent coating, and the coating has a visible light transmittance at 530 nm of greater than 70%. In some embodiments, the coating has a visible light transmittance at 530 nm of greater than 80%. In some embodiments, the coating has a visible light transmittance at 530 nm of greater than 85%. The coating has a high visible light transmittance, which can better meet the application scenarios with high transmittance requirements. The visible light transmittance of the coating can be tested using a light transmittance instrument or a light transmittance meter.

[0087] In some embodiments, the coating layer has a thickness of 1 μm to 1000 μm. In some embodiments, the coating layer has a thickness of 1 μm, 5 μm, 10 μm, 20 μm, 30 μm, 50 μm, 80 μm, 100 μm, 200 μm, 300 μm, 500 μm, 800 μm, or 1000 μm. In some embodiments, the coating layer has a thickness of 5 μm to 100 μm. The thickness of the coating layer is suitably set to better balance the water absorption and adhesion to the substrate.

[0088] The present application also provides a method for preparing a coating layer, comprising:

[0089] The resin composition described above is coated on a substrate, and cured under UV irradiation to obtain a coating layer.

[0090] The coating layer of the present application is simple to prepare and time-consuming, which is conducive to improving the processing efficiency.

[0091] The coating can be applied by brushing, spin coating, dipping, or doctor blading. The substrate can be one or more of a polymer, glass, glass fiber, polyester, aramid, basalt fiber, liquid crystal polymer (LCP), and fiber braid. The UV irradiation time can be less than or equal to 30 s.

[0092] Referring to FIG. 1, the present application also provides a component 100 with a coating layer, which comprises a substrate 101 and a coating layer 102 disposed on the substrate 101, wherein the coating layer 102 comprises the coating layer described above. The component 100 with a coating layer of the present application can better protect the substrate 101, improve the water resistance and wear resistance of the surface of the substrate 101, and firmly adhere the coating layer 102 to the surface of the substrate 101, so that the coating layer 102 is not easily detached, and the long-term service reliability of the component 100 with a coating layer is improved. The specific shape, size, etc. of the component 100 with a coating layer of the present application are not particularly limited and can be set as needed.

[0093] In the present application, the substrate 101 can be various inorganic or organic substrates, such as one or more of a polymer, glass, glass fiber, polyester, aramid, basalt fiber, liquid crystal polymer (LCP), and fiber braid.

[0094] In some embodiments of the present application, the component with a coating layer comprises an optical cable reinforcing member. In one embodiment, the optical cable reinforcing member specifically comprises glass fiber and a coating layer disposed on the surface of the glass fiber, which is a water-blocking tape. The glass fiber can be a glass fiber filament or a glass fiber bundle, and the glass fiber bundle can be composed of a plurality of glass fiber filaments.

[0095] The embodiment of the present application also provides a cable comprising the component with the coating described above. The cable uses the component with the coating of the embodiment of the present application, and the waterproof performance and the like can be improved. The cable can be an optical cable or an electric cable.

[0096] The technical solutions of the present application are further described in the following embodiments.

[0097] In the following examples and comparative examples, each component is taken by weight parts.

[0098] Example 1

[0099] S1. 15 parts of polyurethane acrylate iLENE 246 were warmed to 50°C, then diluted with 85 parts of polyethylene glycol diacrylate 200, and stirred and mixed uniformly;

[0100] S2. The mixed glue solution obtained in S1 was cooled to room temperature, then 5 parts of superfine sodium polyacrylate water absorption powder and 2 parts of a leveling agent were added, and stirred for 30 minutes to mix uniformly;

[0101] S3. To the mixed glue solution obtained in S2, 3 parts of (2,4,6-trimethylbenzoyl) diphenyl phosphine oxide (TPO), 3 parts of 2-isopropylthioxanthone (ITX), and 2 parts of 4-(dimethylamino) benzoic acid (2-butoxyethyl) ester were added, and stirred for 30 minutes to mix uniformly, to obtain a resin composition, i.e. to form a final coating glue solution;

[0102] S4. The coating glue solution prepared in S3 was used to coat a glass plate with a glue solution layer having a thickness of 50 μm using a four-side film applicator;

[0103] S5. The glass plate coated with the glue solution layer in S4 was placed in a 365 nm UV LED box, and after irradiation for 5 s, a cured coating was formed.

[0104] Example 2

[0105] S1. 15 parts of polyurethane acrylate iLENE 246 were warmed to 50°C, then diluted with 85 parts of 2-hydroxyethyl methacrylate, and stirred and mixed uniformly;

[0106] S2. The mixed glue solution obtained in S1 was cooled to room temperature, then 10 parts of superfine sodium polyacrylate water absorption powder and 5 parts of a leveling agent were added, and stirred for 30 minutes to mix uniformly;

[0107] S3. To the mixed glue solution obtained in S2, 4 parts of (2,4,6-trimethylbenzoyl) diphenyl phosphine oxide (TPO), 1 part of 2-isopropylthioxanthone (ITX), and 1 part of 2-(dimethylamino)ethyl benzoate were added, and stirred for 30 minutes to mix uniformly, to obtain a resin composition, i.e. to form a final coating glue solution;

[0108] S4. The coating glue solution prepared in S3 was used to coat a glass plate by using a four-side film applicator to obtain a glue solution layer with a thickness of 50 μm;

[0109] S5. The glass plate coated with the glue solution layer in S4 was placed in a 365 nm UV LED box, and after irradiation for 5 s, a cured coating was formed.

[0110] Example 3

[0111] S1. 15 parts of hydrophilic polyurethane acrylate iLENE 246 were warmed to 50°C, then diluted with 85 parts of polyethylene glycol diacrylate 200, and stirred to mix uniformly;

[0112] S2. The mixed glue solution obtained in S1 was cooled to room temperature, then 15 parts of superfine sodium polyacrylate water absorption powder and 2 parts of a soft lubricant were added, and stirred for 30 minutes to mix uniformly;

[0113] S3. To the mixed glue solution obtained in S2, 2 parts of (2,4,6-trimethylbenzoyl) diphenyl phosphine oxide (TPO), 1 part of 2-isopropylthioxanthone (ITX), and 1 part of ethyl p-dimethylamino benzoate were added, and stirred for 30 minutes to mix uniformly, to form a final coating glue solution;

[0114] S4. The coating glue solution prepared in S3 was used to coat a glass plate by using a four-side film applicator to obtain a glue solution layer with a thickness of 50 μm;

[0115] S5. The glass plate coated with the glue solution layer in S4 was placed in a 365 nm UV LED box, and after irradiation for 5 s, a cured coating was formed.

[0116] Example 4

[0117] S1. 15 parts of hydrophilic polyurethane acrylate iLENE-2292H were warmed to 50°C, then diluted with 85 parts of hydroxyethyl acrylate, and stirred to mix uniformly;

[0118] S2. The mixed glue solution obtained in S1 was cooled to room temperature, then 5 parts of superfine starch water absorption powder and 3 parts of a leveling agent were added, and stirred for 30 minutes to mix uniformly;

[0119] S3. To the mixed glue solution obtained in S2, 4 parts of (2,4,6-trimethylbenzoyl) diphenylphosphine oxide (TPO), 2 parts of 2-isopropylthioxanthone (ITX), and 2 parts of 4,4'-bis(N,N-diethylamino)benzophenone were added, and stirred for 30 minutes to form a final coating glue solution;

[0120] S4. The coating glue solution prepared in S3 was used to prepare a glue solution layer with a thickness of 50 μm on a glass plate using a four-side film applicator;

[0121] S5. The glass plate coated with the glue solution layer in S4 was placed in a 365 nm UV LED box, and after irradiation for 5 s, a cured coating was formed.

[0122] Example 5

[0123] The difference from Example 1 is that the particle size of the water-absorbing powder is 30 microns, and the UV LED irradiation time is 7 s.

[0124] Example 6

[0125] The difference from Example 1 is that the photoinitiator only includes 3 parts of diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), and the UV LED irradiation time is 10 s.

[0126] Example 7

[0127] The difference from Example 1 is that the photoinitiator only includes 3 parts of 2-isopropylthioxanthone (ITX) and 2 parts of 4-(dimethylamino)benzoic acid (2-butoxyethyl) ester, and the UV LED irradiation time is 10 s.

[0128] Comparative Example 1

[0129] The difference from Example 1 is that no water-absorbing powder is added.

[0130] The coatings obtained in Examples 1-7 and Comparative Example 1 were observed for curing, and tested for water absorption, pencil hardness, adhesion, and light transmittance, and the results are shown in Table 1.

[0131] Table 1:

[0132] "Complete curing" in Table 1 means that the surface and the deep layer are completely cured.

[0133] From the results of Table 1, it can be seen that, compared with the comparative example 1 without adding water-absorbing powder, the water absorption amount of the coating 30s and the water absorption amount of 5 min of the examples 1-7 of the present application are greatly improved, indicating that the water absorption performance of the coating is obviously improved. It can be seen from the comparison between the comparative example 1 and the example 5 that selecting a smaller particle size of water-absorbing powder is beneficial to improving the water absorption and water resistance performance, light transmittance, hardness and wear resistance of the coating obtained from the resin composition, and improving the curing efficiency. It can be seen from the comparison between the comparative example 1 and the example 6 that, compared with the example 6 in which only a diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide (TPO) photoinitiator is added, the application example 1 uses a compound of a photoinitiator with higher light curing efficiency and better light curing effect, which can better realize complete curing of the surface layer and the deep layer at the same time, thereby having better film layer performance. It can be seen from the comparison between the comparative example 1 and the example 7 that, compared with the example 7 in which only a 2-isopropylthioxanthone (ITX) and 4-(dimethylamino)benzoic acid (2-butoxyethyl) ester photoinitiator is added, the application example 1 uses a compound of a (2,4,6-trimethylbenzoyl) diphenyl phosphine oxide photoinitiator with higher light curing efficiency and better light curing effect, which can better realize complete curing of the surface layer and the deep layer at the same time, thereby having better film layer performance.

[0134] It should be understood that the first, second, and various numerical numbers involved herein are only for the convenience of differentiation, and do not limit the scope of the present application.

[0135] In the present application, "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects.

[0136] In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or the like means any combination of these items, including any combination of single item or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can mean a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0137] In the present application, "-" represents a range value, including the end point values at both ends, for example, the value of a can be 0.5-15, which means that the value of a can be between 0.5 and 15, and includes the end point values 0.5 and 15.

[0138] It should be understood that the size of the serial number of the above processes in various embodiments of the present application does not mean the order of execution, and part or all of the steps can be executed in parallel or in sequence, and the execution order of the processes should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. A resin composition, characterized by comprising: The resin composition comprises an acrylate oligomer, a reactive unsaturated monomer, a water-absorbing powder, and a photoinitiator.

2. The resin composition according to claim 1, wherein In the resin composition, the mass percentage of the acrylate oligomer is 1%-60%; and / or, the mass percentage of the reactive unsaturated monomer is 5%-80%; and / or, the mass percentage of the water-absorbing powder is 2%-50%; and / or, the mass percentage of the photoinitiator is 0.5%-10%.

3. The resin composition according to claim 1 or 2, characterized by The acrylate oligomer comprises acrylate and / or modified acrylate, the modified acrylate comprising one or more of polyurethane acrylate, epoxy acrylate, polyester acrylate, and polyether acrylate.

4. The resin composition according to any one of claims 1 to 3, wherein The number average molecular weight Mn of the acrylate oligomer is 1000-1 million; the viscosity of the acrylate oligomer at 60℃ is 0-20000 mPa·s.

5. The resin composition according to any one of claims 1 to 4, wherein The water-absorbing powder comprises one or more of starch-based water-absorbing powder, cellulose-based water-absorbing powder, and synthetic polymer-based water-absorbing powder.

6. The resin composition according to Claim 5, wherein The synthetic polymer-based water-absorbing powder comprises one or more of polyacrylate and polyacrylamide.

7. The resin composition according to any one of claims 1 to 6, wherein The D50 particle size of the water-absorbing powder is less than 1000 microns.

8. The resin composition according to Claim 7, wherein The D50 particle size of the water-absorbing powder is less than 20 microns.

9. The resin composition according to any one of claims 1 to 8, wherein The photoinitiator comprises Norrish Type I photoinitiator and / or Norrish Type II photoinitiator.

10. The resin composition according to Claim 9, wherein The mass ratio of the Norrish Type I photoinitiator to the Norrish Type II photoinitiator is 0.1-10:

1.

11. The resin composition according to any one of claims 1 to 10, wherein The photoinitiator comprises one or more of phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide, (2,4,6-trimethylbenzoyl) diphenyl phosphine oxide, phenyl (2,4,6-trimethylbenzoyl) ethyl phosphonate, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)-1-butanone, 2-isopropylthioxanthone, 2,4-diethylthioxanthone, Esacure 3644, 4,4'-bis(diethylamino) benzophenone, Guangchuang Electronics GC-3704, Guangchuang Electronics GC-1005, 4-(dimethylamino) benzoic acid (2-butoxyethyl) ester, benzoic acid 2-(dimethylamino) ethyl ester, ethyl p-dimethylaminobenzoate, and 4,4'-di(N,N-diethylamino) benzophenone.

12. The resin composition according to any one of claims 1 to 11, wherein The resin composition can be cured under ultraviolet light irradiation, and the curing time is less than or equal to 30s.

13. The resin composition according to any one of claims 1 to 12, wherein The reactive unsaturated monomer comprises one or more of vinyl monomer and acrylate monomer.

14. The resin composition according to Claim 13, wherein The vinyl monomer comprises one or more of styrene and N-vinyl pyrrolidone; The acrylate monomer comprises one or more of monofunctional monomer, bifunctional monomer, and multifunctional monomer; The acrylate monomer comprises one or more of monofunctional monomer, bifunctional monomer, and multifunctional monomer; The monofunctional monomer includes one or more of acrylic acid, methyl acrylate, ethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, monofunctional polyethylene glycol acrylate, hydroxyethyl acrylate, carboxyethyl acrylate, 2-hydroxyethyl methacrylate, sodium acrylsulfonate, sodium methacrylsulfonate, sodium 2-acrylamido-2-methylpropane sulfonate, maleic anhydride, fumaric acid, maleic acid, beta-hydroxyethyl methacrylate, isobornyl acrylate, beta-carboxyethyl acrylate, 2-phenoxyethyl acrylate; The difunctional monomer includes one or more of ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, polyethylene glycol diacrylate with Mn<400, 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, N,N'-methylenebisacrylamide; The multifunctional monomer includes one or more of pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate.

15. The resin composition according to any one of claims 1 to 14, wherein The resin composition further includes an auxiliary agent; the auxiliary agent includes one or more of an antistatic agent, a lubricant, an inorganic filler, a lubricant, a coupling agent; the mass percentage of the auxiliary agent in the resin composition is 1%-20%.

16. The method of producing a resin composition according to any one of claims 1 to 15, characterized by, The resin composition includes: The resin composition is obtained by uniformly mixing the acrylate oligomer, the reactive unsaturated monomer, the water-absorbing powder, the photoinitiator, and the auxiliary agent.

17. A coating characterized in that, The coating includes a cured product of the resin composition according to any one of claims 1-15, or includes an acrylate resin matrix and water-absorbing powders distributed in the acrylate resin matrix.

18. The coating of claim 17, wherein, The water-absorbing powders are uniformly distributed in the coating, and the water absorption of the coating is greater than 5g / g in 30s; the water absorption of the coating is greater than 6g / g in 5min.

19. The coating of claim 17 or 18, wherein, The pencil hardness of the coating is greater than or equal to 2H.

20. The coating of any of claims 17-19, wherein, The coating is attached to a substrate, and the adhesion of the coating to the surface of the substrate is greater than or equal to 2B.

21. The coating of any of claims 17-20, wherein, The coating is a transparent coating, and the visible light transmittance of the coating at 530nm is greater than 80%.

22. A method of preparing a coating, characterized by The resin composition according to any one of claims 1-15 is coated on a substrate and cured under ultraviolet light irradiation to obtain a coating. The member with a coating includes a substrate and a coating disposed on the substrate, and the coating includes the coating according to any one of claims 17-21.

23. A component having a coating, characterized by The substrate includes one or more of a polymer, glass, glass fiber, polyester, aramid, basalt fiber, liquid crystal polymer, and fiber weave.

24. The coated article of claim 22, wherein the coating is a multilayer coating. The member with a coating includes a cable strength member.

25. Component having a coating according to claim 23 or 24, characterized in that The member with a coating according to any one of claims 23-25.

26. A cable, characterized by ​

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