Composite skin-touch paint film for notebook keyboard and preparation process of composite skin-touch paint film

Abstract

The invention provides a notebook keyboard composite skin-touch paint film and a preparation process thereof. The notebook keyboard composite skin-touch paint film comprises a primer layer, a middle paint layer and a UV skin-touch finish paint layer which are sequentially arranged on the surface of a notebook keyboard base material, the primer layer is prepared from the following components in percentage by weight: 20 to 30 percent of hydroxy acrylic resin, 15 to 25 percent of modified epoxy acrylate, 5 to 10 percent of vinyl modified fumed silica, 5 to 10 percent of fluorosilicone resin, 5 to 10 percent of epoxy phosphate, 5 to 10 percent of filler, 15 to 25 percent of solvent A, 2 to 4 percent of curing agent, 0.1 to 0.3 percent of flatting agent and 0.1 to 0.3 percent of defoaming agent; the middle paint layer is prepared from the following components: 40 to 50 percent of acrylic polyurethane resin, 12 to 16 percent of filler, 1 to 3 percent of cerium oxide, 7 to 12 percent of laser carving toner, 1 to 3 percent of dispersing agent, 20 to 30 percent of solvent B, 0.1 to 0.3 percent of plasticizer, 0.1 to 0.3 percent of flatting agent and 0.1 to 0.3 percent of defoaming agent; the UV skin-touch finish paint layer is prepared from the following components: 52 to 55 percent of polyurethane acrylate resin, 15 to 25 percent of reactive diluent, 2 to 4 percent of photoinitiator, 10 to 15 percent of skin-touch additive, 5 to 10 percent of filler, 0.1 to 0.3 percent of flatting agent and 0.1 to 0.3 percent of antioxidant. The paint film provided by the invention has the advantages of favorable wear resistance, favorable adhesive force and favorable hand feeling.

Description

Technical Field

[0001] The invention relates to the technical field of paints, and in particular to a composite skin-feel paint film for a notebook keyboard and a preparation process thereof. Background Art

[0002] A laptop keyboard is a type of computer keyboard designed specifically for laptops. While it features all the function keys of a standard keyboard, it's also optimized for the portability and space constraints of a laptop. During the manufacturing process, laptop keyboards are often coated with a special coating to improve their feel, appearance, and durability. Common keyboard coatings include ABS and skin-like coatings.

[0003] ABS coating is a common keyboard surface treatment. It offers high durability and abrasion resistance, generally providing a better tactile and visual experience. While ABS coating offers advantages such as durability and resistance to wear, it also has the disadvantage of being harder to the touch and less supple than skin-like coatings. Skin-like coatings mimic the texture of human skin, providing a soft, moisturizing feel and a better user experience. While it offers advantages such as a soft touch and aesthetically pleasing appearance, it also offers disadvantages such as susceptibility to damage from tough objects like nails and poor abrasion resistance.

[0004] The choice of paint has a significant impact on the performance and user experience of the keyboard. It is particularly important to choose a suitable paint so that the keyboard can have the advantages of strong adhesion and strong wear resistance while providing a good user experience during use. Keyboard paints in existing general technologies, such as ABS coatings and skin-like coatings, are difficult to take into account the advantages of strong adhesion, strong wear resistance, and a strong skin-feeling experience. Therefore, it is necessary to improve the design of the keyboard paint layer in related technologies. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a composite skin-feel paint film for a notebook keyboard and a preparation process thereof.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present application discloses a composite skin-feel paint film for a laptop keyboard, comprising a primer layer, an intermediate paint layer, and a UV skin-feel topcoat layer sequentially arranged on the surface of a laptop keyboard substrate, in terms of weight percentage: The components of the primer layer include: 20-30% hydroxy acrylic resin, 15-25% modified epoxy acrylate, 5-10% vinyl modified fumed silica, 5-10% fluorosilicone resin, 5-10% epoxy phosphate, 5-10% filler, 15-25% solvent A, 2-4% curing agent, 0.1-0.3% leveling agent and 0.1-0.3% defoaming agent; The components of the middle paint layer include: acrylic polyurethane resin 40-50%, filler 12-16%, cerium oxide 1-3%, laser engraving color powder 7-12%, dispersant 1-3%, solvent B 20-30%, plasticizer 0.1-0.3%, leveling agent 0.1-0.3% and defoaming agent 0.1-0.3%; The components of the UV skin-feel topcoat layer include: 52-55% polyurethane acrylate resin, 15-25% active diluent, 2-4% photoinitiator, 10-15% skin-feel additive, 5-10% filler, 0.1-0.3% leveling agent, and 0.1-0.3% antioxidant.

[0007] Through the above technical solution, the hydroxyl acrylic resin provides excellent adhesion and chemical resistance, while the modified epoxy acrylate exhibits excellent heat resistance, mechanical strength, and processability. Vinyl-modified fumed silica, through surface grafting of vinyl groups, reduces surface polarity, enhances dispersibility in non-polar systems, and improves the coating's mechanical adhesion through a physical anchoring effect. Fluorosilicone resin partially bonds with the vinyl-modified fumed silica, creating a tight connection and strengthening the adhesion between the coating components and the substrate, enhancing the stability of the primer coating. Epoxy phosphate improves adhesion by directly bonding to the metal surface, significantly enhancing the coating's water resistance, boiling water resistance, salt spray resistance, and solvent resistance. Acrylic polyurethane resin exhibits excellent flexibility, abrasion resistance, and weather resistance. Laser engraving pigments produce a specific color change under laser action. Fillers further enhance the coating's hardness and thickness, ensuring the overall performance and aesthetics of the film. Polyurethane acrylate resin exhibits excellent curing properties and skin feel. Reactive diluents adjust viscosity and cure speed, and photoinitiators initiate UV curing.

[0008] Preferably, the base material comprises a primer layer, an intermediate paint layer and a UV skin-feel topcoat layer sequentially provided on the surface of the notebook keyboard substrate, in terms of weight percentage: The composition of the primer layer includes: 30% hydroxy acrylic resin, 20.6% modified epoxy acrylate, 7% vinyl modified fumed silica, 7% fluorosilicone resin, 7% epoxy phosphate, 5% filler, 20% solvent A, 3% curing agent, 0.2% leveling agent and 0.2% defoaming agent; The components of the middle paint layer include: acrylic polyurethane resin 46.4%, filler 14%, cerium oxide 2%, laser engraving color powder 10%, dispersant 2%, solvent B 25%, plasticizer 0.2%, leveling agent 0.2% and defoaming agent 0.2%; The components of the UV skin-feel topcoat layer include: 53.6% polyurethane acrylate resin, 24% active diluent, 3% photoinitiator, 12% skin-feel additive, 7% filler, 0.2% leveling agent, and 0.2% antioxidant.

[0009] Preferably, the filler is one of nano-silicon dioxide, barium sulfate or talc; and the solvent A is one or more of toluene, xylene, butanol, ethylene glycol butyl ether, propylene glycol methyl ether acetate, and water-based polyurethane.

[0010] By setting up the above technical solution, nano-silica, barium sulfate and talc can all improve the hardness and wear resistance of the coating. The components of solvent A can not only have a good dissolving effect on organic matter, but also adjust the viscosity and drying speed of the coating.

[0011] Preferably, solvent B is composed of butyl acetate and xylene in a mass ratio of 6:4, and the reactive diluent is trimethylolpropane triacrylate.

[0012] Preferably, the photoinitiator is 1-hydroxycyclohexyl phenyl ketone or diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide; the skin feel additive is one or more of silicone wax powder, fluorocarbon resin, and silicone-modified acrylic microgel.

[0013] By providing the above technical solution, the skin feel additive can give the coating a soft skin feel, and the leveling agent and antioxidant can improve the performance and appearance of the coating.

[0014] Preferably, the composition of the hydroxy acrylic resin is as follows, by weight percentage: 35-40% bisphenol A epoxy resin, 20-25% acrylic acid, 12-18% hydroxyethyl methacrylate, 5-12% styrene, 5-12% butyl acrylate, 0.1-0.5% hydroquinone and 0.5-1% N,N-dimethylaniline.

[0015] By implementing the above technical solution, bisphenol A epoxy resin provides basic strength, rigidity, and good adhesion. Acrylic acid reacts with the epoxy groups in the bisphenol A epoxy resin to introduce unsaturated bonds, giving the resin light-curing or heat-curing properties. Hydroxyethyl methacrylate further introduces hydroxyl groups and unsaturated double bonds, increasing the resin's flexibility and reactivity, helping to improve the crack resistance of the primer layer. Styrene can reduce the viscosity of the system while participating in the polymerization reaction, increasing the resin's hardness and water resistance. Butyl acrylate enhances the flexibility and impact resistance of the bisphenol A epoxy resin, improving its crack resistance.

[0016] Preferably, the preparation method of hydroxy acrylic resin is as follows: 1) Weigh bisphenol A epoxy resin and acrylic acid in appropriate proportions and mix well. Then add N,N-dimethylaniline and hydroquinone. Stir at 350-400 rpm for 4 hours under a nitrogen atmosphere at 85°C. Set aside. 2) Cooling the prepolymer obtained in step 1) to 58°C, adding styrene and butyl acrylate, and dispersing at a high speed of 900-950 r / min for 25-30 minutes; 3) Add hydroxyethyl methacrylate to the mixture obtained in step 2), heat to 78° C. and conduct free radical polymerization for 5 hours to obtain the product.

[0017] Preferably, the preparation method of the primer layer coating is as follows: L1. Weigh 1 / 4 of the total weight of solvent A, vinyl-modified fumed silica, and fluorosilicone resin in proportion, and ultrasonically disperse them at a power of 750 W and a speed of 1400 r / min for 2-3 minutes to uniformly disperse them, and set aside; L2. Weigh hydroxy acrylic resin, modified epoxy acrylate, epoxy phosphate, 3 / 4 of the total weight of solvent A, filler, solvent A, curing agent, leveling agent and defoaming agent in proportion, and add them into the reactor together with the product obtained in step L1. Stir at a speed of 700-800 r / min for 10-15 minutes, and finally filter the material with a 180-200 mesh filter to obtain the primer layer coating.

[0018] Preferably, the preparation method of the intermediate paint layer is as follows: M1. Weigh acrylic polyurethane resin and solvent B in proportion and add them to the reactor. Stir evenly and then add laser engraving color powder. Disperse evenly at a speed of 700-800 r / min and set aside. M2. Add filler, cerium oxide and dispersant to the mixture obtained in M1 in proportion, continue to disperse evenly at a speed of 700-800 r / min, then add plasticizer, leveling agent and defoamer, stir at a speed of 900-1000 r / min for 10-15 minutes, and finally filter the material with a 150-170 mesh filter to obtain the intermediate paint layer; The preparation method of the UV skin-feel topcoat paint is as follows: N1. Add polyurethane acrylate resin and reactive diluent to a clean container, stir at 250-300 r / min for 10-15 minutes, add photoinitiator, and continue stirring for 10-25 minutes to ensure that the photoinitiator is completely dissolved; N2. Add skin-feel additives, fillers, leveling agents, and antioxidants to the product obtained in N1, disperse evenly at a speed of 700-800 r / min, and store in the dark to obtain a UV skin-feel topcoat.

[0019] This application also discloses a preparation process of a composite skin-feel paint film for a laptop keyboard, comprising the following steps: S1. Clean and degrease the surface of the ABS-PC composite notebook keyboard, and evenly apply the primer on the keyboard surface by spraying or brushing. The primer layer thickness is 15-20 μm. After standing for 2 hours, dry it in a 65-70 ° C oven for 30-40 minutes. S2. After the primer is dry, the middle paint layer is applied. Different colors can be laser engraved according to user needs. The middle coating is 15-20um and the drying conditions are the same as the primer. Among them, the laser power is 20-25W, the frequency is 40-50kHz, the speed is 300-400mm / s, and the pulse width is 30-40ns; S3. After the middle paint layer is dry, apply the UV skin-feel topcoat on the surface of the middle paint layer with a coating thickness of 28-30um. Then pre-cure with LED lamp to provide basic adhesion, then surface cure with 254 excimer lamp, and finally thoroughly cure with mercury lamp.

[0020] The beneficial effects of the present invention are: Hydroxylated acrylic resins provide excellent adhesion and chemical resistance, while modified epoxy acrylates offer excellent heat resistance, mechanical strength, and processing properties. Vinyl-modified fumed silica, through the grafting of vinyl groups onto its surface, reduces surface polarity, enhances dispersibility in non-polar systems, and improves the coating's mechanical bonding through a physical anchoring effect. Fluorosilicone resins partially bond and tightly connect with vinyl-modified fumed silica, strengthening the adhesion between the coating components and the substrate and improving the stability of the primer coating. Epoxy phosphates improve adhesion by directly bonding to the metal surface, significantly enhancing the coating's water resistance, boiling water resistance, salt spray resistance, and solvent resistance.

[0021] Acrylic polyurethane resin has good flexibility, wear resistance and weather resistance. Laser engraving color powder can produce specific color changes under the action of laser. Filler can further improve the hardness and thickness of the coating, ensuring the comprehensive performance and aesthetics of the paint film.

[0022] Polyurethane acrylate resin offers excellent curing properties and a smooth, skin-feeling effect. Reactive diluents adjust viscosity and curing speed, photoinitiators trigger the UV curing reaction, skin-feel additives impart a soft feel to the coating, and leveling agents and antioxidants improve the coating's performance and appearance. The UV skin-feel topcoat is pre-cured with an LED lamp to provide a base for adhesion, and then surface-cured with a 254 excimer lamp. The shrinkage of the surface film creates ripples, ensuring the keyboard's aesthetically pleasing feel and texture.

[0023] Bisphenol A epoxy resin provides foundational strength, rigidity, and good adhesion. Acrylic acid reacts with the epoxy groups in the bisphenol A epoxy resin, introducing unsaturated bonds and giving the resin light-curing or heat-curing properties. Hydroxyethyl methacrylate further introduces hydroxyl groups and unsaturated double bonds, increasing the resin's flexibility and reactivity, contributing to improved crack resistance in the primer layer. Styrene reduces system viscosity and participates in the polymerization reaction, increasing the resin's hardness and water resistance. Butyl acrylate enhances the bisphenol A epoxy resin's flexibility and impact resistance, improving its crack resistance. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] Example 1: This example discloses a composite skin-feel paint film for a laptop keyboard, comprising a primer layer, an intermediate paint layer, and a UV skin-feel topcoat layer sequentially disposed on the surface of a laptop keyboard substrate, in terms of weight percentage: The composition of the primer layer includes: 30% hydroxy acrylic resin, 21.8% modified epoxy acrylate, 6% vinyl modified fumed silica, 5% fluorosilicone resin, 5% epoxy phosphate, 5% filler, 25% solvent A, 2% curing agent, 0.1% leveling agent and 0.1% defoaming agent; Wherein, the preparation method of primer layer coating is as follows: L1. Weigh 1 / 4 of the total weight of solvent A, vinyl-modified fumed silica, and fluorosilicone resin in proportion, and ultrasonically disperse them at a power of 750 W and a speed of 1400 r / min for 2 min to uniformly disperse them, and set aside; L2. Weigh hydroxy acrylic resin, modified epoxy acrylate, epoxy phosphate, 3 / 4 of the total weight of solvent A, filler, solvent A, curing agent, leveling agent and defoaming agent in proportion, and add them into the reactor together with the product obtained in step L1. Stir at a speed of 700 r / min for 10 minutes, and finally filter the material with a 180-mesh filter to obtain the primer layer coating.

[0026] The components of the middle paint layer include: acrylic polyurethane resin 50%, filler 15%, cerium oxide 1%, laser engraving color powder 7.7%, dispersant 1%, solvent B 25%, plasticizer 0.1%, leveling agent 0.1% and defoaming agent 0.1%; Among them, M1, acrylic polyurethane resin and solvent B are weighed in proportion and added into the reaction kettle. After stirring evenly, add laser engraving color powder and disperse evenly at a speed of 700r / min for standby use; M2. Add filler, cerium oxide and dispersant to the mixture obtained in M1 in proportion, continue to disperse evenly at a speed of 700 r / min, then add plasticizer, leveling agent and defoamer, stir at a speed of 900 r / min for 10 minutes, and finally filter the material with a 150-mesh filter to obtain the intermediate paint layer; The components of the UV skin-feel topcoat layer include: 55% polyurethane acrylate resin, 24% active diluent, 3% photoinitiator, 10% skin-feel additive, 7.8% filler, 0.1% leveling agent, and 0.1% antioxidant.

[0027] The preparation method of the UV skin-feel topcoat is as follows: N1. Add polyurethane acrylate resin and reactive diluent to a clean container, stir at 250 r / min for 10 minutes, add photoinitiator, and continue stirring for 10 minutes to ensure that the photoinitiator is completely dissolved; N2. Add skin-feel additives, fillers, leveling agents, and antioxidants to the product obtained in N1, disperse evenly at a speed of 700 r / min, and store in the dark to obtain a UV skin-feel topcoat.

[0028] The filler is nano-silica; the solvent A is toluene.

[0029] Solvent B is composed of butyl acetate and xylene in a mass ratio of 6:4, and the active diluent is trimethylolpropane triacrylate.

[0030] The photoinitiator is 1-hydroxycyclohexyl phenyl ketone; the skin feel additive is silicone wax powder.

[0031] The composition of the hydroxy acrylic resin is as follows, in weight percentage: 40% bisphenol A epoxy resin, 25% acrylic acid, 14% hydroxyethyl methacrylate, 10% styrene, 10% butyl acrylate, 0.1% hydroquinone and 0.9% N,N-dimethylaniline. The preparation method of the hydroxy acrylic resin is as follows: 1) Weigh bisphenol A epoxy resin and acrylic acid in appropriate proportions and mix thoroughly. Then add N,N-dimethylaniline and hydroquinone. Stir at 350 rpm for 4 h under a nitrogen atmosphere at 85°C. Set aside. 2) Cooling the prepolymer obtained in step 1) to 58°C, adding styrene and butyl acrylate, and high-speed dispersion at 900 rpm for 25 minutes; 3) Add hydroxyethyl methacrylate to the mixture obtained in step 2), heat to 78° C. and conduct free radical polymerization for 5 hours to obtain the product.

[0032] This embodiment also discloses a preparation process of a composite skin-feel paint film for a laptop keyboard, comprising the following steps: S1. Clean and degrease the surface of the ABS-PC composite notebook keyboard, and evenly apply primer on the keyboard surface by spraying or brushing. The primer layer thickness is 15 μm. After standing for 2 hours, it is dried in a 65°C oven for 30 minutes. S2. After the primer is dry, the middle paint layer is applied. Different colors can be laser engraved according to user needs. The middle coating is 15um and the drying conditions are the same as the primer. Among them, the laser power is 20W, the frequency is 40kHz, the speed is 300mm / s, and the pulse width is 30ns; S3. After the middle paint layer is dry, apply the UV skin-feel topcoat on the surface of the middle paint layer with a coating thickness of 28um. Then pre-cure with LED lamp to provide basic adhesion, then surface cure with 254 excimer lamp, and finally thoroughly cure with mercury lamp.

[0033] Example 2: This example discloses a composite skin-feel paint film for a laptop keyboard, comprising a primer layer, an intermediate paint layer, and a UV skin-feel topcoat layer sequentially disposed on the surface of a laptop keyboard substrate, in terms of weight percentage: The composition of the primer layer includes: hydroxy acrylic resin 25%, modified epoxy acrylate 20%, vinyl modified fumed silica 7%, fluorosilicone resin 8%, epoxy phosphate 10%, filler 6%, solvent A 20%, curing agent 3.4%, leveling agent 0.3% and defoaming agent 0.3%; Wherein, the preparation method of primer layer coating is as follows: L1. Weigh 1 / 4 of the total weight of solvent A, vinyl-modified fumed silica, and fluorosilicone resin in proportion, and ultrasonically disperse them at a power of 750 W and a speed of 1400 r / min for 3 minutes to uniformly disperse them, and set aside; L2. Weigh hydroxy acrylic resin, modified epoxy acrylate, epoxy phosphate, 3 / 4 of the total weight of solvent A, filler, solvent A, curing agent, leveling agent and defoaming agent in proportion, and add them into the reactor together with the product obtained in step L1. Stir at a speed of 800 r / min for 15 minutes, and finally filter the material with a 200-mesh filter to obtain a primer layer coating.

[0034] The components of the middle paint layer include: acrylic polyurethane resin 45%, filler 15%, cerium oxide 2%, laser engraving color powder 10%, dispersant 2.1%, solvent B 25%, plasticizer 0.3%, leveling agent 0.3% and defoaming agent 0.3%; Among them, M1, acrylic polyurethane resin and solvent B are weighed in proportion and added into the reaction kettle. After stirring evenly, add laser engraving color powder and disperse evenly at a speed of 800r / min for standby use; M2. Add filler, cerium oxide and dispersant to the mixture obtained in M1 in proportion, continue to disperse evenly at a speed of 800 r / min, then add plasticizer, leveling agent and defoamer, stir at a speed of 1000 r / min for 15 minutes, and finally filter the material with a 170-mesh filter to obtain the intermediate paint layer; The components of the UV skin-feel topcoat layer include: 55% polyurethane acrylate resin, 20% active diluent, 3.4% photoinitiator, 15% skin-feel additive, 6% filler, 0.3% leveling agent, and 0.3% antioxidant.

[0035] The preparation method of the UV skin-feel topcoat is as follows: N1. Add polyurethane acrylate resin and reactive diluent to a clean container, stir at 300 r / min for 15 minutes, add photoinitiator, and continue stirring for 25 minutes to ensure that the photoinitiator is completely dissolved; N2. Add skin-feel additives, fillers, leveling agents, and antioxidants to the product obtained in N1, disperse evenly at a speed of 800 r / min, and store in the dark to obtain a UV skin-feel topcoat.

[0036] The filler is barium sulfate; the solvent A is composed of toluene and xylene in a mass ratio of 1:1.

[0037] Solvent B is composed of butyl acetate and xylene in a mass ratio of 6:4, and the active diluent is trimethylolpropane triacrylate.

[0038] The photoinitiator is diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide; the skin-feel additive is fluorocarbon resin.

[0039] The composition of the hydroxy acrylic resin is as follows, in percentage by weight: 40% bisphenol A epoxy resin, 25% acrylic acid, 15% hydroxyethyl methacrylate, 10.5% styrene, 8% butyl acrylate, 0.5% hydroquinone and 1% N,N-dimethylaniline. The preparation method of the hydroxy acrylic resin is as follows: 1) Weigh bisphenol A epoxy resin and acrylic acid in appropriate proportions and mix thoroughly. Then add N,N-dimethylaniline and hydroquinone. Stir at 400 rpm for 4 h under a nitrogen atmosphere at 85°C. Set aside. 2) Cooling the prepolymer obtained in step 1) to 58°C, adding styrene and butyl acrylate, and high-speed dispersion at a speed of 950 r / min for 30 minutes; 3) Add hydroxyethyl methacrylate to the mixture obtained in step 2), heat to 78° C. and conduct free radical polymerization for 5 hours to obtain the product.

[0040] This embodiment also discloses a preparation process of a composite skin-feel paint film for a laptop keyboard, comprising the following steps: S1. Clean and degrease the surface of the ABS-PC composite notebook keyboard, and evenly apply the primer on the keyboard surface by spraying or brushing. The primer layer thickness is 20 μm. After standing for 2 hours, it is dried in a 70°C oven for 40 minutes. S2. After the primer is dry, the middle paint layer is applied. Different colors can be laser engraved according to user needs. The middle coating is 20um and the drying conditions are the same as the primer. Among them, the laser power is 25W, the frequency is 40-50kHz, the speed is 400mm / s, and the pulse width is 40ns; S3. After the middle paint layer is dry, apply the UV skin-feel topcoat on the surface of the middle paint layer with a coating thickness of 30um. Then pre-cure with LED lamp to provide basic adhesion, then surface cure with 254 excimer lamp, and finally thoroughly cure with mercury lamp.

[0041] Example 3: This example discloses a composite skin-feel paint film for a laptop keyboard, comprising a primer layer, an intermediate paint layer, and a UV skin-feel topcoat layer sequentially disposed on the surface of a laptop keyboard substrate, in terms of weight percentage: The composition of the primer layer includes: 30% hydroxy acrylic resin, 20.6% modified epoxy acrylate, 7% vinyl modified fumed silica, 7% fluorosilicone resin, 7% epoxy phosphate, 5% filler, 20% solvent A, 3% curing agent, 0.2% leveling agent and 0.2% defoaming agent; Wherein, the preparation method of primer layer coating is as follows: L1. Weigh 1 / 4 of the total weight of solvent A, vinyl-modified fumed silica, and fluorosilicone resin in proportion, and ultrasonically disperse them at a power of 750 W and a speed of 1400 r / min for 2.5 min to uniformly disperse them, and set aside; L2. Weigh hydroxy acrylic resin, modified epoxy acrylate, epoxy phosphate, 3 / 4 of the total weight of solvent A, filler, solvent A, curing agent, leveling agent and defoaming agent in proportion, and add them into the reactor together with the product obtained in step L1. Stir at a speed of 750 r / min for 15 minutes, and finally filter the material with a 190-mesh filter to obtain the primer layer coating.

[0042] The components of the middle paint layer include: acrylic polyurethane resin 46.4%, filler 14%, cerium oxide 2%, laser engraving color powder 10%, dispersant 2%, solvent B 25%, plasticizer 0.2%, leveling agent 0.2% and defoaming agent 0.2%; Among them, M1, acrylic polyurethane resin and solvent B are weighed in proportion and added into the reaction kettle. After stirring evenly, add laser engraving color powder and disperse evenly at a speed of 750r / min for later use. M2. Add filler, cerium oxide and dispersant to the mixture obtained in M1 in proportion, continue to disperse evenly at a speed of 750 r / min, then add plasticizer, leveling agent and defoamer, stir at a speed of 950 r / min for 15 minutes, and finally filter the material with a 160-mesh filter to obtain the intermediate paint layer; The components of the UV skin-feel topcoat layer include: 53.6% polyurethane acrylate resin, 24% active diluent, 3% photoinitiator, 12% skin-feel additive, 7% filler, 0.2% leveling agent, and 0.2% antioxidant.

[0043] The preparation method of the UV skin-feel topcoat is as follows: N1. Add polyurethane acrylate resin and reactive diluent to a clean container, stir at 275 r / min for 15 minutes, add photoinitiator, and continue stirring for 15 minutes to ensure that the photoinitiator is completely dissolved; N2. Add skin-feel additives, fillers, leveling agents, and antioxidants to the product obtained in N1, disperse evenly at a speed of 750 r / min, and store in the dark to obtain a UV skin-feel topcoat.

[0044] The filler is talc; and the solvent A is composed of ethylene glycol butyl ether and propylene glycol methyl ether acetate in a mass ratio of 1:1.

[0045] Solvent B is composed of butyl acetate and xylene in a mass ratio of 6:4, and the active diluent is trimethylolpropane triacrylate.

[0046] The photoinitiator is 1-hydroxycyclohexyl phenyl ketone; the skin feel additive is silicone-modified acrylic microgel.

[0047] The composition of the hydroxy acrylic resin is as follows, in percentage by weight: 40% bisphenol A epoxy resin, 25% acrylic acid, 15% hydroxyethyl methacrylate, 10% styrene, 9% butyl acrylate, 0.5% hydroquinone, and 0.5% N,N-dimethylaniline. The preparation method of the hydroxy acrylic resin is as follows: 1) Weigh bisphenol A epoxy resin and acrylic acid in appropriate proportions and mix thoroughly. Then add N,N-dimethylaniline and hydroquinone. Stir at 370 rpm for 4 h under a nitrogen atmosphere at 85°C. Set aside. 2) Cooling the prepolymer obtained in step 1) to 58°C, adding styrene and butyl acrylate, and high-speed dispersion at a speed of 930 r / min for 30 minutes; 3) Add hydroxyethyl methacrylate to the mixture obtained in step 2), heat to 78° C. and conduct free radical polymerization for 5 hours to obtain the product.

[0048] This embodiment also discloses a preparation process of a composite skin-feel paint film for a laptop keyboard, comprising the following steps: S1. Clean and degrease the surface of the ABS-PC composite notebook keyboard, and evenly apply the primer on the keyboard surface by spraying or brushing. The primer layer thickness is 20 μm. After standing for 2 hours, it is dried in a 65°C oven for 35 minutes. S2. After the primer is dry, the middle paint layer is applied. Different colors can be laser engraved according to user needs. The middle coating is 18um and the drying conditions are the same as the primer. Among them, the laser power is 25W, the frequency is 45kHz, the speed is 350mm / s, and the pulse width is 35ns; S3. After the middle paint layer is dry, apply the UV skin-feel topcoat on the surface of the middle paint layer with a coating thickness of 30um. Then pre-cure with LED lamp to provide basic adhesion, then surface cure with 254 excimer lamp, and finally thoroughly cure with mercury lamp.

[0049] Comparative Example 1: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no hydroxyl acrylic resin is added.

[0050] Comparative Example 2: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no modified epoxy acrylate is added.

[0051] Comparative Example 3: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no vinyl-modified fumed silica is added.

[0052] Comparative Example 4: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no fluorosilicone resin is added.

[0053] Comparative Example 5: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no epoxy phosphate is added.

[0054] Comparative Example 6: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no acrylic polyurethane resin is added.

[0055] Comparative Example 7: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no polyurethane acrylate resin is added.

[0056] Comparative Example 8: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no skin-feel additive is added.

[0057] Comparative Example 9: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no active diluent is added.

[0058] Comparative Example 10: A composite skin-feel paint film for a laptop keyboard. The only difference between this skin-feel paint film and Example 3 is that no laser engraving color powder is added.

[0059] The tactile feel of the paint films was evaluated according to ASTM D1894.

[0060] The wear resistance of the paint film was tested according to GBT 17635-2011.

[0061] The adhesion grade of the paint film is tested according to GB / T 9286-1998.

[0062] The paint films obtained in Examples 1-3 and Comparative Examples 1-10 were subjected to performance tests to measure the comprehensive properties of the paint films. The results are shown in Table 1.

[0063] Table 1

[0064] From Table 1 we can see that: Combining Comparative Examples 7 and 8, it can be seen that the absence of polyurethane acrylate resin and skin feel additives has a significant impact on the feel of the paint film, indicating that these two components are very helpful in improving the feel of the paint film.

[0065] Combining Comparative Examples 6 and 7, it can be seen that the absence of the addition of acrylic polyurethane resin and polyurethane acrylate resin has a significant impact on the wear resistance of the paint film, indicating that these two components are very helpful in improving the wear resistance of the paint film.

[0066] Combined with Comparative Example 1, it can be seen that not adding hydroxyl acrylic resin has a greater impact on the adhesion of the paint film, and not adding epoxy phosphate also has a significant impact on the adhesion of the paint film, indicating that the addition of these two components can improve the adhesion performance of the paint film.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A composite skin-feel paint film for a laptop keyboard, characterized in that: The base material of the notebook keyboard comprises a primer layer, an intermediate paint layer and a UV skin-feel topcoat layer, which are arranged in sequence on the surface of the notebook keyboard base material, and are calculated in weight percentage as follows: The components of the primer layer include: 20-30% hydroxy acrylic resin, 15-25% modified epoxy acrylate, 5-10% vinyl modified fumed silica, 5-10% fluorosilicone resin, 5-10% epoxy phosphate, 5-10% filler, 15-25% solvent A, 2-4% curing agent, 0.1-0.3% leveling agent and 0.1-0.3% defoaming agent; The components of the middle paint layer include: acrylic polyurethane resin 40-50%, filler 12-16%, cerium oxide 1-3%, laser engraving color powder 7-12%, dispersant 1-3%, solvent B 20-30%, plasticizer 0.1-0.3%, leveling agent 0.1-0.3% and defoaming agent 0.1-0.3%; The components of the UV skin-feel topcoat layer include: 52-55% polyurethane acrylate resin, 15-25% active diluent, 2-4% photoinitiator, 10-15% skin-feel additive, 5-10% filler, 0.1-0.3% leveling agent, and 0.1-0.3% antioxidant.

2. The composite skin-feel paint film for laptop keyboard according to claim 1, characterized in that: The base material of the notebook keyboard comprises a primer layer, an intermediate paint layer and a UV skin-feel topcoat layer, which are arranged in sequence on the surface of the notebook keyboard base material, and are calculated in weight percentage as follows: The composition of the primer layer includes: 30% hydroxy acrylic resin, 20.6% modified epoxy acrylate, 7% vinyl modified fumed silica, 7% fluorosilicone resin, 7% epoxy phosphate, 5% filler, 20% solvent A, 3% curing agent, 0.2% leveling agent and 0.2% defoaming agent; The components of the middle paint layer include: acrylic polyurethane resin 46.4%, filler 14%, cerium oxide 2%, laser engraving color powder 10%, dispersant 2%, solvent B 25%, plasticizer 0.2%, leveling agent 0.2% and defoaming agent 0.2%; The components of the UV skin-feel topcoat layer include: 53.6% polyurethane acrylate resin, 24% active diluent, 3% photoinitiator, 12% skin-feel additive, 7% filler, 0.2% leveling agent, and 0.2% antioxidant.

3. The composite skin-feel paint film for laptop keyboard according to claim 1 or 2, characterized in that: The filler is one of nano-silicon dioxide, barium sulfate or talc; and the solvent A is one or more of toluene, xylene, butanol, ethylene glycol butyl ether, propylene glycol methyl ether acetate and water-based polyurethane.

4. The composite skin-feel paint film for laptop keyboard according to claim 1 or 2, characterized in that: Solvent B is composed of butyl acetate and xylene in a mass ratio of 6:4, and the active diluent is trimethylolpropane triacrylate.

5. The composite skin-feel paint film for laptop keyboard according to claim 1 or 2, characterized in that: The photoinitiator is 1-hydroxycyclohexyl phenyl ketone or diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide; the skin feel additive is one or more of silicone wax powder, fluorocarbon resin, and silicone modified acrylic microgel.

6. The composite skin-feel paint film for laptop keyboard according to claim 1 or 2, characterized in that: The hydroxy acrylic resin comprises the following components in weight percentage: 35-40% bisphenol A epoxy resin, 20-25% acrylic acid, 12-18% hydroxyethyl methacrylate, 5-12% styrene, 5-12% butyl acrylate, 0.1-0.5% hydroquinone and 0.5-1% N,N-dimethylaniline.

7. The composite skin-feel paint film for laptop keyboard according to claim 6, characterized in that: The preparation method of hydroxy acrylic resin is as follows: 1) Weigh bisphenol A epoxy resin and acrylic acid in appropriate proportions and mix well. Then add N,N-dimethylaniline and hydroquinone. Stir at 350-400 rpm for 4 hours under a nitrogen atmosphere at 85°C. Set aside. 2) Cooling the prepolymer obtained in step 1) to 58°C, adding styrene and butyl acrylate, and dispersing at a high speed of 900-950 r / min for 25-30 minutes; 3) Add hydroxyethyl methacrylate to the mixture obtained in step 2), heat to 78° C. and conduct free radical polymerization for 5 hours to obtain the product.

8. The composite skin-feel paint film for laptop keyboard according to claim 6, characterized in that: The preparation method of the primer layer coating is as follows: L1. Weigh 1 / 4 of the total weight of solvent A, vinyl-modified fumed silica, and fluorosilicone resin in proportion, and ultrasonically disperse them at a power of 750 W and a speed of 1400 r / min for 2-3 minutes to uniformly disperse them, and set aside; L2. Weigh hydroxy acrylic resin, modified epoxy acrylate, epoxy phosphate, 3 / 4 of the total weight of solvent A, filler, solvent A, curing agent, leveling agent and defoaming agent in proportion, and add them into the reactor together with the product obtained in step L1. Stir at a speed of 700-800 r / min for 10-15 minutes, and finally filter the material with a 180-200 mesh filter to obtain the primer layer coating.

9. The composite skin-feel paint film for laptop keyboard according to claim 6, characterized in that: The preparation method of the intermediate paint layer coating is as follows: M1. Weigh acrylic polyurethane resin and solvent B in proportion and add them to the reactor. Stir evenly and then add laser engraving color powder. Disperse evenly at a speed of 700-800 r / min and set aside. M2. Add filler, cerium oxide and dispersant to the mixture obtained in M1 in proportion, continue to disperse evenly at a speed of 700-800 r / min, then add plasticizer, leveling agent and defoamer, stir at a speed of 900-1000 r / min for 10-15 minutes, and finally filter the material with a 150-170 mesh filter to obtain the intermediate paint layer; The preparation method of the UV skin-feel topcoat paint is as follows: N1. Add polyurethane acrylate resin and reactive diluent to a clean container, stir at 250-300 r / min for 10-15 minutes, add photoinitiator, and continue stirring for 10-25 minutes to ensure that the photoinitiator is completely dissolved; N2. Add skin-feel additives, fillers, leveling agents, and antioxidants to the product obtained in N1, disperse evenly at a speed of 700-800 r / min, and store in the dark to obtain a UV skin-feel topcoat.

10. A process for preparing the composite skin-feel paint film for a laptop keyboard according to any one of claims 1 to 9, characterized in that: The steps are as follows: S1. Clean and degrease the surface of the ABS-PC composite notebook keyboard, and evenly apply the primer on the keyboard surface by spraying or brushing. The primer layer thickness is 15-20 μm. After standing for 2 hours, dry it in a 65-70 ° C oven for 30-40 minutes. S2. After the primer is dry, the middle paint layer is applied. Different colors can be laser engraved according to user needs. The middle coating is 15-20um and the drying conditions are the same as the primer. Among them, the laser power is 20-25W, the frequency is 40-50kHz, the speed is 300-400mm / s, and the pulse width is 30-40ns; S3. After the middle paint layer is dry, apply the UV skin-feel topcoat on the surface of the middle paint layer with a coating thickness of 28-30um. Then pre-cure with LED lamp to provide basic adhesion, then surface cure with 254 excimer lamp, and finally thoroughly cure with mercury lamp.

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