Self-repairing scratch-resistant coating, PVC decorative film and preparation method of self-repairing scratch-resistant coating

Abstract

The invention provides a self-repairing scratch-resistant coating, a PVC decorative film and a preparation method of the PVC decorative film, and relates to the technical field of decorative films. The self-repairing scratch-resistant coating provided by the invention comprises flexible polyurethane acrylate, modified epoxy acrylate, a reactive diluent, a photoinitiator, a siloxane microcapsule repairing agent, a dynamic cross-linking agent, a flatting agent, an anti-fingerprint agent and butyl acetate. The coating can be efficiently repaired, meanwhile, the toughness of the coating can be improved through the flexible polyurethane acrylate, secondary damage after repairing is avoided, and the purpose of synergism of scratch resistance and self-repairing is achieved. The PVC decorative film provided by the invention adopts the self-repairing scratch-resistant coating, so that the surface hardness is improved, the scratch resistance is enhanced, and a scratch self-repairing technology is added, so that scratches are reversible, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of decorative film, in particular to a self-repairing scratch-resistant coating, a PVC decorative film and a preparation method thereof. BACKGROUND

[0002] The single-layer PVC film is mainly produced by calendering or extrusion process. The preparation method takes polyvinyl chloride (PVC) resin as the base material, and adds plasticizers, stabilizers, colorants and other additives to prepare it. The single-layer PVC film is then prepared into a decorative film with diversified patterns through printing patterns, multi-layer hot sticking, embossing and the like. At present, this process is mature. With the improvement of production technology and the demand for product individualization and functionalization in the market, the existing production technology mainly focuses on the development of base material modification, surface treatment and functionalization while meeting the aesthetic requirements. Environmentally friendly and functional materials are used for the base material, and surface treatment technologies such as thermal curing, photocuring and electron beam curing are used. The functionalization of PVC decorative film includes properties such as wear resistance, weather resistance, scratch resistance and easy cleaning.

[0003] The ordinary scratch-resistant film uses a photocured coating to improve the hardness through surface treatment technology, but the coating cannot be repaired after being damaged. SUMMARY

[0004] The present application aims to provide a self-repairing scratch-resistant coating, a PVC decorative film and a preparation method thereof, and to solve the problem that the coating of the existing ordinary scratch-resistant film cannot be repaired after being damaged.

[0005] To achieve the above purpose, the present application provides a self-repairing scratch-resistant coating, the raw materials of which include, in mass parts: 60-70 parts of flexible polyurethane acrylate, 5-10 parts of modified epoxy acrylate, 15-20 parts of active diluent, 3-5 parts of photoinitiator, 3-5 parts of silicone microcapsule repair agent, 3-5 parts of dynamic crosslinking agent, 0.2-0.3 parts of leveling agent, 0.5-1.0 parts of anti-fingerprint agent and 5-8 parts of butyl acetate. The dynamic crosslinking agent includes a multifunctional acrylated polyether oligomer and a lipoic acid polyethylene glycol acrylate in a mass ratio of (2.5-3):1.

[0006] In some embodiments, the active diluent includes isobornyl acrylate and tripropylene glycol diacrylate in a mass ratio of (3-4):1.

[0007] In some embodiments, the photoinitiator includes 1-hydroxycyclohexyl phenyl ketone and 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide in a mass ratio of (1-2):1.

[0008] In some embodiments, the leveling agent is selected from at least one of polyether modified polysiloxane and perfluoro polyether acrylate.

[0009] In some embodiments, the anti-fingerprint agent is selected from at least one of perfluoropolyether, silicone-fluorine copolymer, and nano-silica.

[0010] This application also provides a PVC decorative film, which includes, from top to bottom: the above-mentioned self-healing scratch-resistant coating, weather-resistant PVC layer, water-based ink layer, and printed PVC base film; The weather-resistant PVC layer comprises, by weight, 100 parts PVC resin, 20-25 parts environmentally friendly plasticizer, and 1.0-1.5 parts light stabilizer.

[0011] In some embodiments, the environmentally friendly plasticizer comprises dioctyl terephthalate (DOTP) and sebacic acid-based polyester in a mass ratio of (8-10):1.

[0012] In some embodiments, the light stabilizer comprises a benzotriazole UV absorber and a polymeric HALS in a mass ratio of (1.25-3):1.

[0013] This application also provides a method for preparing the PVC decorative film as described above, comprising: The self-healing scratch-resistant coating is applied to the surface of the weather-resistant PVC layer to obtain a scratch-resistant layer. The water-based ink layer is printed onto the surface of the printed PVC base film to obtain a printed layer; The scratch-resistant layer and the printed layer are bonded together to obtain the PVC decorative film.

[0014] Compared with the prior art, the beneficial effects of this application include: The self-healing scratch-resistant coating provided in this application includes flexible polyurethane acrylate, modified epoxy acrylate, reactive diluent, photoinitiator, siloxane microcapsule repair agent, dynamic crosslinking agent, leveling agent, anti-fingerprint agent, and butyl acetate. Through a dual self-healing mechanism of chemical repair by dynamic chemical bonds and physical repair by microcapsules, the coating can achieve efficient repair. At the same time, the flexible polyurethane acrylate can improve the toughness of the coating and avoid secondary damage after repair, thus achieving the synergistic purpose of scratch resistance and self-healing.

[0015] The PVC decorative film provided in this application utilizes the self-healing scratch-resistant coating of this application, which improves surface hardness and scratch resistance, and incorporates scratch self-healing technology, making scratches reversible and extending its lifespan. It uses environmentally friendly raw materials, environmentally friendly plasticizers, and water-based / mild solvent processes, complying with RoHS and REACH standards. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application.

[0017] Figure 1 This is a schematic diagram of the structure of the PVC decorative film of this application.

[0018] Figure label: 1- Self-healing scratch-resistant coating; 2- Weather-resistant PVC layer; 3- Water-based ink layer; 4- Printable PVC base film. Detailed Implementation

[0019] As used in this article: "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0020] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0021] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0022] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (where K is any number representing a multiplier). It is important to understand that, unlike parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0023] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0024] This application provides a self-healing, scratch-resistant coating, the raw materials of which, by weight, include: 60-70 parts flexible polyurethane acrylate, 5-10 parts modified epoxy acrylate, 15-20 parts reactive diluent, 3-5 parts photoinitiator, 3-5 parts siloxane microcapsule repair agent, 3-5 parts dynamic crosslinking agent, 0.2-0.3 parts leveling agent, 0.5-1.0 parts antifingerprint agent, and 5-8 parts butyl acetate; The dynamic crosslinking agent comprises a multifunctional acrylated polyether oligomer and thioctic acid polyethylene glycol acrylate in a mass ratio of (2.5-3):1.

[0025] The self-healing scratch-resistant coating provided in this application includes flexible polyurethane acrylate, modified epoxy acrylate, reactive diluent, photoinitiator, siloxane microcapsule repair agent, dynamic crosslinking agent, leveling agent, anti-fingerprint agent, and butyl acetate. Through a dual self-healing mechanism of chemical repair by dynamic chemical bonds and physical repair by microcapsules, the coating can achieve efficient repair. At the same time, the flexible polyurethane acrylate can improve the toughness of the coating and avoid secondary damage after repair, thus achieving the synergistic purpose of scratch resistance and self-healing.

[0026] The mass fraction of flexible polyurethane acrylate can be, for example, any value between 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70 parts or between 60 and 70 parts.

[0027] Flexible polyurethane acrylate has high elongation, which matches the flexibility of the PVC film substrate. Utilizing its flexibility, it disperses stress through elastic deformation when subjected to external forces. Flexible polyurethane acrylate can improve the toughness of the coating, avoid secondary damage after repair, and achieve the goal of scratch resistance and self-healing.

[0028] The mass fraction of the modified epoxy acrylate can be, for example, any value between 5, 6, 7, 8, 9, 10 parts or 5-10 parts.

[0029] The silicone segments in modified epoxy acrylates can enhance surface smoothness and resistance to stains and alcohol. Modified epoxy acrylates do not directly participate in the repair process; their role is to improve coating hardness and optimize surface properties to support the repair effect.

[0030] The mass fraction of the reactive diluent can be, for example, any value between 15, 16, 17, 18, 19, 20 or 15-20 parts.

[0031] Reactive diluents can balance viscosity and curing speed, improve adhesion to PVC substrates, and prevent plasticizer migration.

[0032] In some embodiments, the reactive diluent comprises isoborneol acrylate and tripropylene glycol diacrylate in a mass ratio of (3-4):1, for example, any ratio between 3:1, 3.5:1, 4:1 or (3-4):1.

[0033] Isobornyl acrylate (IBOA) is an important organic compound with advantages such as low shrinkage, high adhesion, high hardness, and low irritation. It can improve the hardness of the coating while maintaining and improving its elasticity, and enhance the gloss and adhesion of the coating.

[0034] Tripropylene glycol diacrylate (TPGDA), as a UV-curable resin monomer, is widely used in coatings, inks, adhesives, and electronic materials. TPGDA offers advantages such as improved curing speed, abrasion resistance, excellent dilution ability, low viscosity, and low cost. The combination of isobornyl acrylate and TPGDA provides complementary and synergistic benefits, offering excellent adhesion and rapid curing speed for coatings.

[0035] The mass fraction of the photoinitiator can be, for example, any value between 3, 3.5, 4, 4.5, 5 or 3-5 parts.

[0036] The photoinitiator is cured by irradiation with a matching LED light source and has resistance to yellowing.

[0037] In some embodiments, the photoinitiator comprises 1-hydroxycyclohexylphenyl ketone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of (1-2):1, for example, any ratio between 1:1, 1.5:1, 2:1 or (1-2):1.

[0038] 1-Hydroxycyclohexylphenyl ketone is a highly efficient, yellowing-resistant free radical solid photoinitiator with advantages such as long storage time, high initiation efficiency, and wide ultraviolet absorption range.

[0039] 2,4,6-Trimethylbenzoyl-diphenylphosphine oxide (TPO) is an important organic compound widely used in photocurable materials. TPO is a highly efficient free radical photoinitiator, particularly suitable for colored systems and thick-film curing applications. Upon absorbing ultraviolet light, it generates free radicals, initiating resin crosslinking reactions, and is commonly used in white coating systems.

[0040] The mass fraction of the siloxane microcapsule repair agent can be, for example, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, or any value between 3 and 5 parts.

[0041] Siloxane microcapsule repair agents are a special type of repair agent used in self-healing materials. The core material is usually an organosiloxane compound, such as active siloxane, polydimethylsiloxane (PDMS), vinyl polydimethylsiloxane, etc., while the capsule wall material (shell material) is usually a polymer, such as polyurea, polyurea-formaldehyde, calcium alginate, etc., with a particle size between 10-30 micrometers.

[0042] The repair mechanism includes exogenous repair and endogenous repair. Exogenous repair: when the coating is damaged by external forces and scratches appear, the microcapsule walls rupture, releasing the internal core material (repair agent), which fills the gaps in the scratches through its fluidity. Endogenous repair: some siloxane materials achieve multiple repairs through dynamic bonds (such as hydrogen bonds and disulfide bonds), without the need for external repair agents. In coating materials, siloxane microcapsule repair agents can be used to repair scratches and damage on the coating surface, improving the coating's durability and protective performance.

[0043] The mass fraction of the dynamic crosslinking agent can be, for example, any value between 3, 3.5, 4, 4.5, 5 or 3-5 parts.

[0044] Dynamic crosslinking agents have self-healing properties. After the coating surface is damaged, the broken disulfide bonds will reconnect on their own within a certain period of time, realizing the self-healing of the coating's microstructure. They can work synergistically with siloxane microcapsule repair agents to repair scratches of varying degrees.

[0045] In some embodiments, the dynamic crosslinking agent comprises a multifunctional acrylated polyether oligomer and thioctic acid polyethylene glycol acrylate in a mass ratio of (2.5-3):1, for example, any ratio between 2.5:1, 2.8:1, 3:1, or (2.5-3):1.

[0046] Multifunctional acrylated polyether oligomers are formed by the condensation reaction of acrylic acid or methacrylic acid with polyether polyols. They contain dynamic disulfide bonds, providing excellent crosslinking properties. Combining multifunctional acrylated polyether oligomers with polyethylene glycol thioacrylate (PEG-1,4-dimethyl thiocyanate) to construct a repair network enhances self-healing efficiency.

[0047] In some embodiments, the mass fraction of the leveling agent can be, for example, any value between 0.2 parts, 0.25 parts, 0.3 parts, or 0.2-0.3 parts.

[0048] The function of leveling agents is to optimize leveling, prevent reaction with plasticizers on PVC surfaces, and ensure a smooth coating surface.

[0049] In some embodiments, the leveling agent is selected from at least one of polyether-modified polysiloxanes and perfluoropolyether acrylates. Polyether-modified polysiloxanes are organosilicon compounds modified by introducing polyether segments onto the polysiloxane chain. This structure combines the low surface tension of polysiloxanes with the hydrophilicity of polyethers. As a leveling agent, polyether-modified polysiloxanes can reduce surface tension, improve the wettability of the coating to the substrate, promote coating flow, eliminate orange peel and cratering effects, and result in a smooth and even coating. Perfluoropolyether acrylate leveling agents can significantly reduce the surface tension of coatings, improve leveling performance, and reduce surface defects in the coating film.

[0050] In some embodiments, the mass fraction of the anti-fingerprint agent can be, for example, any value between 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1.0 parts, or 0.5-1.0 parts.

[0051] Anti-fingerprint agents can improve stain resistance and tactile feel, meeting the needs of furniture surface cleaning.

[0052] In some embodiments, the anti-fingerprint agent is selected from at least one of perfluoropolyethers, silicone-fluorine copolymers, and nano-silica. Perfluoropolyethers (PFPEs) are synthetic polymers with unique properties; their molecular chains consist of fluorine, carbon, and oxygen atoms, exhibiting extremely low surface tension, excellent chemical stability, low volatility, and a wide operating temperature range. Silicone-fluorine copolymers are polymeric materials copolymerized from silicon-containing and fluorine-containing monomers, possessing characteristics of both organosilicon and organofluorine compounds. They have unique physical and chemical properties and are used to manufacture high-performance coatings, exhibiting excellent waterproofing, stain resistance, and weather resistance.

[0053] In some embodiments, the mass fraction of butyl acetate can be, for example, any value between 5, 6, 7, 8 or 5-8 parts.

[0054] Butyl acetate is used to adjust viscosity and is a mild solvent; avoid dissolving PVC film.

[0055] This application also provides a PVC decorative film; please refer to [link / reference]. Figure 1 From top to bottom, it includes: the self-healing scratch-resistant coating 1, the weather-resistant PVC layer 2, the water-based ink layer 3, and the printed PVC base film 4. The weather-resistant PVC layer comprises, by weight, 100 parts PVC resin, 20-25 parts environmentally friendly plasticizer, and 1.0-1.5 parts light stabilizer.

[0056] The PVC decorative film provided in this application utilizes the self-healing scratch-resistant coating of this application, which improves surface hardness and scratch resistance, and incorporates scratch self-healing technology, making scratches reversible and extending its lifespan. It uses environmentally friendly raw materials, environmentally friendly plasticizers, and water-based / mild solvent processes, complying with RoHS and REACH standards.

[0057] The self-healing scratch-resistant coating 1 has a thickness ranging from 5 to 15 micrometers. The weather-resistant PVC layer 2 is a transparent PVC surface layer with weather resistance, a thickness of 0.04 mm to 0.08 mm, free of phthalates and heavy metals, and compliant with EU REACH regulations. The water-based ink layer 3 is printed with water-based ink, with a thickness ranging from 10 to 20 micrometers, the thickness determined by the depth of the gravure printing pits. It offers a variety of patterns and is environmentally friendly and non-toxic. The printable PVC base film 4 is a printable colored PVC base film, made with environmentally friendly plasticizers using a calendering process, with a thickness of 0.06 mm to 0.10 mm. It is free of phthalates and heavy metals and compliant with EU REACH regulations.

[0058] In some embodiments, the mass fraction of the environmentally friendly plasticizer may be, for example, any value between 20, 21, 22, 23, 24, 25 parts or 20-25 parts.

[0059] In some embodiments, the environmentally friendly plasticizer comprises dioctyl terephthalate and sebacic acid-based polyester in a mass ratio of (8-10):1, for example, any ratio between 8:1, 8.5:1, 9:1, 9.5:1, 10:1 or (8-10):1.

[0060] Di-2-ethylhexyl terephthalate (DOTP) is a commonly used plasticizer with excellent heat resistance, cold resistance, low volatility, and electrical insulation properties.

[0061] Sebacic acid-based polyesters are polyester compounds synthesized by polycondensation reaction of sebacic acid and polyols (such as ethylene glycol, butanediol, etc.). They are used as plasticizers in plastics such as PVC to improve the flexibility and processing performance of the materials.

[0062] The combined use of dioctyl terephthalate and sebacic acid-based polyesters offers advantages over using either alone, including enhanced migration resistance, low-temperature toughness, processing stability, and extended lifespan.

[0063] In some embodiments, the light stabilizer comprises a benzotriazole UV absorber and a polymeric HALS in a mass ratio of (1.25-3):1, for example, any ratio between 1.25:1, 1.5:1, 2:1, 2.5:1, 3:1, or (1.25-3):1.

[0064] Benzotriazole UV absorbers (UVA) are compounds that effectively absorb ultraviolet light and convert it into heat energy. They are widely used in various materials to improve their lightfastness and stability. Benzotriazole UVA prevents photodegradation of materials by absorbing ultraviolet light and converting it into heat energy.

[0065] Polymerized HALS (hindered amine light stabilizers) typically consist of hindered amine functional groups linked to the polymer backbone, forming a high molecular weight structure. By forming nitrooxy radicals (TEMPO), they capture harmful free radicals generated during polymer photo-oxidation, thereby preventing polymer chain breakage and degradation.

[0066] This application also provides a method for preparing the PVC decorative film as described above, comprising: The self-healing scratch-resistant coating is applied to the surface of the weather-resistant PVC layer to obtain a scratch-resistant layer. The water-based ink layer is printed onto the surface of the printed PVC base film to obtain a printed layer; The scratch-resistant layer and the printed layer are bonded together to obtain the PVC decorative film.

[0067] Using UV curing technology, the self-healing scratch-resistant coating, which is evenly applied to the surface of the weather-resistant PVC layer, is cured into a thin film, namely the self-healing scratch-resistant coating layer, by ultraviolet irradiation. This results in a scratch-resistant layer that includes both the self-healing scratch-resistant coating layer and the weather-resistant PVC layer, giving the surface properties such as stain resistance, scratch resistance, and weather resistance. In particular, surface scratches can self-heal, protecting the decorative surface and extending its service life.

[0068] Water-based inks are printed onto the surface of a printed PVC base film using printing technology to form a water-based ink layer with rich patterns, resulting in a printed layer consisting of a water-based ink layer and a printed PVC base film.

[0069] Finally, the scratch-resistant layer and the printed layer are heat-bonded using a lamination and embossing technique to form a PVC decorative film with self-healing scratch resistance.

[0070] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0071] The sources of the raw materials used in each embodiment and comparative example are as follows: Flexible polyurethane acrylate, purchased from: Shanghai Guangyi Chemical Co., Ltd. Modified epoxy acrylate, purchased from: Jining Tangyi Chemical Co., Ltd.; Isoborneol acrylate and tripropylene glycol diacrylate were purchased from: Sinopharm Chemical Reagent Co., Ltd. 1-Hydroxycyclohexylphenyl ketone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide were purchased from: Sinopharm Chemical Reagent Co., Ltd. The siloxane microcapsule repair agent is customized by Hefei Zhongkechuang Micro Technology Co., Ltd. The shell material is polyurea, the core material is active siloxane, and the particle size is 15 microns. Multifunctional acrylated polyether oligomer, purchased from: Shandong Tunan New Materials Co., Ltd. Polyethylene glycol acrylate thioctic acid, purchased from: Xi'an Qiyue Biotechnology; Polyether-modified polysiloxane, purchased from Guangdong Fangxin Biotechnology Co., Ltd. Perfluoropolyether, purchased from: Dongguan Jialede Lubricating Materials Co., Ltd.; Dioctyl terephthalate, purchased from: Zhuhai Liancheng Chemical Industry Co., Ltd.; Sebacic acid is a polyester, purchased from: Sinopharm Chemical Reagent Co., Ltd. Benzotriazole UV absorbers, purchased from: Dongguan Yingsheng Plastic & Chemical Co., Ltd. Polymerized HALS, purchased from Dongguan Kangjin New Materials Technology Co., Ltd.

[0072] Example 1 Example 1 first provides a self-healing scratch-resistant coating, the raw materials of which include: 65g flexible polyurethane acrylate, 8g modified epoxy acrylate, 18g reactive diluent (isoborneol acrylate and tripropylene glycol diacrylate in a mass ratio of 3:1), 4g photoinitiator (1-hydroxycyclohexylphenyl ketone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of 1:1), 4g siloxane microcapsule repair agent, 4g dynamic crosslinking agent (multifunctional acrylated polyether oligomer and thioctic acid polyethylene glycol acrylate in a mass ratio of 2.5:1), 0.2g leveling agent polyether modified polysiloxane, 0.7g anti-fingerprint agent perfluoropolyether, and 6g butyl acetate.

[0073] Example 1 also provides a PVC decorative film, which includes, from top to bottom: the self-healing scratch-resistant coating of Example 1 (10 micrometers thick), the weather-resistant PVC layer (0.06 mm thick), the water-based ink layer (15 micrometers thick), and the printed PVC base film (0.08 mm thick). The raw materials of the weather-resistant PVC layer, by mass parts, include: 100 parts of PVC resin, 22 parts of environmentally friendly plasticizer (a combination of dioctyl terephthalate and sebacic acid-based polyester in a mass ratio of 10:1) and 1.3 parts of light stabilizer (a combination of benzotriazole UV absorber and polymeric HALS in a mass ratio of 3:1).

[0074] Example 1 also provides a method for preparing a PVC decorative film, comprising the following steps: (1) Preparation of self-healing scratch-resistant coating: First, mix flexible polyurethane acrylate with dynamic crosslinking agent at 60°C to form a polymer. Then, mix all materials thoroughly until the resin is completely dissolved. The entire slurry has a certain viscosity (10-20 seconds in 3# Zein cup test) and is a slightly yellow transparent solution. Then, seal and store it.

[0075] (2) Weather-resistant PVC layer is prepared by calendering process. The weather-resistant PVC layer is preheated at 60°C for 2 minutes. The self-healing and scratch-resistant coating is evenly applied to the surface of the weather-resistant PVC layer by printing. The coating is cured by UV curing technology and mercury lamp irradiation for 2-5 seconds, forming a self-healing and scratch-resistant coating on the surface of the weather-resistant PVC layer, thus making a scratch-resistant layer with self-healing function.

[0076] (3) Using multi-plate printing coating technology, water-based ink is printed layer by layer on the surface of the printed PVC base film through the collaborative operation of multiple printing plates (such as gravure, screen or flexographic). Each plate pattern color is combined into a complete pattern, realizing the sequential coating of multiple layers of ink, forming a water-based ink layer on the surface of the printed PVC base film, and making a printed layer with rich patterns.

[0077] (4) Using lamination and hot pressing technology, a scratch-resistant layer with self-healing function and a printed layer with rich patterns are laminated together to make a PVC decorative film with self-healing function against scratches.

[0078] Example 2 Example 2 first provides a self-healing scratch-resistant coating. The only difference between the raw materials and those in Example 1 is that the mass of the siloxane microcapsule repair agent is 3g, the mass of the dynamic crosslinking agent is 3g, and the remaining amounts are the same as in Example 1.

[0079] Example 2 also provides a PVC decorative film, which differs from Example 1 only in that: the raw materials of the weather-resistant PVC layer contain 20 parts of environmentally friendly plasticizer and 1.0 part of light stabilizer, while the remaining amounts and preparation methods are the same as in Example 1.

[0080] Example 3 Example 3 first provides a self-healing scratch-resistant coating. The only difference between the raw materials and those in Example 1 is that the mass of the siloxane microcapsule repair agent is 5g, the mass of the dynamic crosslinking agent is 5g, and the remaining amounts are the same as in Example 1.

[0081] Example 3 also provides a PVC decorative film, which differs from Example 1 only in that: the environmentally friendly plasticizer in the weather-resistant PVC layer is 25 parts, the light stabilizer is 1.5 parts, and the remaining amounts and preparation methods are the same as in Example 1.

[0082] Comparative Example 1 Comparative Example 1 first provides a self-healing scratch-resistant coating, the only difference between its raw materials and those of Example 1 is that it does not add siloxane microcapsule repair agent and dynamic crosslinking agent, while the other dosages are the same as those of Example 1.

[0083] Comparative Example 1 also provides a PVC decorative film, which is prepared in the same way as in Example 1.

[0084] Comparative Example 2 Comparative Example 2 first provides a self-healing scratch-resistant coating, the only difference between its raw materials and those of Example 1 is that no dynamic crosslinking agent is added, and the other amounts are the same as those of Example 1.

[0085] Comparative Example 2 also provides a PVC decorative film, which is prepared in the same way as in Example 1.

[0086] Comparative Example 3 Comparative Example 3 first provides a self-healing scratch-resistant coating, the only difference between its raw materials and those of Example 1 is that no siloxane microcapsule repair agent is added, while the other dosages are the same as those of Example 1.

[0087] Comparative Example 3 also provides a PVC decorative film, which is prepared in the same way as in Example 1.

[0088] Comparative Example 4 Comparative Example 4 first provides a self-healing scratch-resistant coating, the only difference between its raw materials and those of Example 1 is that the dynamic crosslinking agent is a combination of multifunctional acrylated polyether oligomer and thioctic acid polyethylene glycol acrylate in a mass ratio of 1:1, and the remaining amounts are the same as those of Example 1.

[0089] Comparative Example 4 also provides a PVC decorative film, which is prepared in the same way as in Example 1.

[0090] Comparative Example 5 Comparative Example 5 first provides a self-healing scratch-resistant coating, the only difference between its raw materials and those of Example 1 is that the dynamic crosslinking agent is a combination of multifunctional acrylated polyether oligomer and thioctic acid polyethylene glycol acrylate in a mass ratio of 4:1, and the remaining amounts are the same as those of Example 1.

[0091] Comparative Example 5 also provides a PVC decorative film, which is prepared in the same way as in Example 1.

[0092] Comparative Example 6 Comparative Example 6 first provides a self-healing scratch-resistant coating, the only difference between its raw materials and those of Example 1 is that the dynamic crosslinking agent is ureidopyrimidinone, and the remaining amounts are the same as those of Example 1.

[0093] Comparative Example 6 also provides a PVC decorative film, which is prepared in the same way as in Example 1.

[0094] Comparative Example 7 Comparative Example 7 first provides a self-healing scratch-resistant coating, the raw materials of which are the same as those in Example 1.

[0095] Comparative Example 7 also provides a PVC decorative film, which differs from Example 1 only in that: no light stabilizer is added to the raw materials of the weather-resistant PVC layer, while the remaining dosages and preparation methods are the same as in Example 1.

[0096] The technical solutions of the PVC decorative films in each embodiment and comparative example are shown in Table 1, and the technical effects are shown in Table 2.

[0097] Table 1. Technical solutions of PVC decorative films for each embodiment and comparative example (unit: g).

[0098] Table 2. Technical Effects of PVC Decorative Films in Each Embodiment and Comparative Example

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0100] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A self-healing, scratch-resistant coating, characterized in that, Its raw materials, by mass parts, include: 60-70 parts flexible polyurethane acrylate, 5-10 parts modified epoxy acrylate, 15-20 parts reactive diluent, 3-5 parts photoinitiator, 3-5 parts siloxane microcapsule repair agent, 3-5 parts dynamic crosslinking agent, 0.2-0.3 parts leveling agent, 0.5-1.0 parts antifingerprint agent, and 5-8 parts butyl acetate; The dynamic crosslinking agent comprises a multifunctional acrylated polyether oligomer and thioctic acid polyethylene glycol acrylate in a mass ratio of (2.5-3):

1.

2. The self-healing scratch-resistant coating according to claim 1, characterized in that, The reactive diluent comprises isoborneol acrylate and tripropylene glycol diacrylate in a mass ratio of (3-4):

1.

3. The self-healing scratch-resistant coating according to claim 1, characterized in that, The photoinitiator comprises 1-hydroxycyclohexylphenyl ketone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide in a mass ratio of (1-2):

1.

4. The self-healing scratch-resistant coating according to claim 1, characterized in that, The leveling agent is selected from at least one of polyether-modified polysiloxane and perfluoropolyether acrylate.

5. The self-healing scratch-resistant coating according to claim 1, characterized in that, The anti-fingerprint agent is selected from at least one of perfluoropolyether, silicone-fluorine copolymer, and nano-silica.

6. A PVC decorative film, characterized in that, From top to bottom, it includes: the self-healing scratch-resistant coating, the weather-resistant PVC layer, the water-based ink layer, and the printed PVC base film as described in any one of claims 1 to 5; The weather-resistant PVC layer comprises, by weight, 100 parts PVC resin, 20-25 parts environmentally friendly plasticizer, and 1.0-1.5 parts light stabilizer.

7. The PVC decorative film according to claim 6, characterized in that, The environmentally friendly plasticizer comprises dioctyl terephthalate and sebacic acid-based polyester in a mass ratio of (8-10):

1.

8. The PVC decorative film according to claim 6, characterized in that, The light stabilizer comprises a benzotriazole UV absorber and a polymeric HALS in a mass ratio of (1.25-3):

1.

9. A method for preparing a PVC decorative film as described in any one of claims 6 to 8, characterized in that, include: The self-healing scratch-resistant coating is applied to the surface of the weather-resistant PVC layer to obtain a scratch-resistant layer. The water-based ink layer is printed onto the surface of the printed PVC base film to obtain a printed layer; The scratch-resistant layer and the printed layer are bonded together to obtain the PVC decorative film.

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