Membrane capable of realizing brightening based on spraying and preparation process thereof, and mobile phone battery cover

Abstract

The invention discloses a spraying-based brightening diaphragm and a preparation process thereof, and a mobile phone battery cover. The diaphragm comprises a body PET diaphragm, a UV texture layer, a spraying brightening layer and an ink layer, the UV texture layer is positioned on the surface of one side of the body PET membrane; the spraying brightening layer is located on the surface of the side, away from the body PET film, of the UV texture layer. The ink layer is located on the surface of the side, away from the UV texture layer, of the spraying brightening layer. According to the invention, the UV texture layer is prepared on the body PET membrane by applying the UV transfer printing process, and then the spraying process is used for replacing an electroplating NCVM process, so that the brightening effect is realized, and finally, the membrane which is good in texture effect, long in service life, easy to process and low in cost is obtained.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronic equipment, and particularly relates to a film piece for brightening based on spraying, a preparation process thereof and a mobile phone battery cover. BACKGROUND

[0002] Mobile phones are one of indispensable smart devices nowadays, and with the improvement of people's living quality, the demand for mobile phone battery covers is also increasing. At present, the mobile phone battery cover is obtained by transferring the texture of GDF (Glass Deco Film) to the film piece, coating the film piece texture, and then bonding the film piece with the cover body, so as to obtain a mobile phone battery cover with a decorative effect.

[0003] The conventional manufacturing process of the existing film piece is generally PET film + UV transfer printing + NCVM coating + silk printing ink. Since the NCVM coating process requires high-cost electroplating equipment, the manufacturing process is long, the process is complex, the production yield is low, the production cost is high, and the color effect of the overall decoration has a small color gamut, the light and shadow effect and the level of the single color effect are weak, and the visual effect is single.

[0004] Therefore, it has become an urgent problem to prepare a film piece that can replace electroplated NCVM to achieve brightening. SUMMARY

[0005] Based on the above technical problems, the application provides a film piece for brightening based on spraying, a preparation process thereof and a mobile phone battery cover. The UV texture layer is prepared on the body PET film by using the UV transfer printing process, and then the spraying process is used to replace the electroplated NCVM process to achieve brightening effect, so as to finally obtain a film piece with good texture effect, long service life, easy processing and low cost.

[0006] The application provides a film piece for brightening based on spraying, which comprises a body PET film, a UV texture layer, a spraying brightening layer and an ink layer. The UV texture layer is located on one side surface of the body PET film; the spraying brightening layer is located on one side surface of the UV texture layer away from the body PET film; and the ink layer is located on one side surface of the spraying brightening layer away from the UV texture layer.

[0007] In the application, the brightening layer is formed by spraying, which not only has a simple process and strong reproducibility, but also can form different color appearance decoration effects.

[0008] Preferably, the thickness of the body PET film is 25-100 pm; the thickness of the UV texture layer is 5-20 pm; the thickness of the spraying brightening layer is 100-800 nm; and the thickness of the ink layer is 5-40 pm.

[0009] The application further provides a preparation process of the film based on the spraying for brightening, comprising the following steps: providing a PET film; transferring UV texture glue on one side surface of the PET film to form a UV texture layer; spraying brightening material on the side surface of the UV texture layer away from the PET film to form a spraying brightening layer; screen printing ink on the side surface of the spraying brightening layer away from the UV texture layer to form an ink layer.

[0010] In the application, the UV texture layer is formed on the PET film by UV transfer printing, so that the film has a micro-texture effect; the spraying brightening layer and the ink layer are respectively formed on the UV texture layer by spraying and screen printing, so that the brightening effect is achieved, the brightness and color effect of the film are enhanced, and the texture layer can be better displayed; compared with the traditional process, the film is simpler and does not need to invest in high-cost electroplating equipment, so the cost is lower.

[0011] Preferably, the raw materials of the UV texture glue include, by weight, 10-30 parts of polyester acrylate, 30-50 parts of polyurethane acrylate, 30-50 parts of active diluent, 5-20 parts of adhesion-promoting resin and 1-5 parts of photoinitiator.

[0012] In the application, the UV texture glue is composed of polyester acrylate, polyurethane acrylate, active diluent, adhesion-promoting resin and photoinitiator, and the nanotexture layer is formed under ultraviolet curing through the UV transfer printing process, so that the nanotexture layer has the characteristics of corrosion resistance, weather resistance, high mechanical property and strong wear resistance.

[0013] Preferably, the polyester acrylate is a polyester acrylate with a functionality of three to eight; the polyurethane acrylate is a polyurethane acrylate with a functionality of two to ten; the diluent is at least one of isobornyl methacrylate, N,N-dimethyl acrylamide, dipropylene glycol diacrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate or hydroxyethyl methacrylate; and the photoinitiator is at least one of 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone or 2,4,6-trimethylbenzoyl phenyl phosphonic acid ethyl ester.

[0014] Preferably, the adhesion-promoting resin is obtained by esterification and condensation of bis(carboxymethyl)trithiocarbonate and o-hydroxybenzophenone, and then copolymerization of fluorine-containing acrylate and 4-vinylbenzaldehyde as a chain transfer agent. The fluorine-containing acrylate is at least one of hexafluorobutyl methacrylate, dodecafluoroheptyl acrylate, tridecafluorooctyl acrylate or trifluoroethyl methacrylate.

[0015] In the present application, the promoting adhesion resin forms a copolymer of the fluorine-containing acrylate and 4-vinyl benzaldehyde through a reversible addition-fragmentation chain transfer reaction, and the photoinitiator group of benzophenone is further grafted on the resin through esterification condensation reaction; on the one hand, the photoinitiator group of benzophenone can initiate the crosslinking of the group resin of polyester acrylate and polyurethane acrylate with diluent, so that the promoting adhesion resin can be well compatible with the group resin; on the other hand, the C-F polar group contained in the fluorine-containing acrylate and the nanoparticles in the subsequent brightening material form good compatibility, and the benzaldehyde group contained in 4-vinyl benzaldehyde and the nanoparticles modified by amino silane coupling can form Schiff base addition reaction, so that the nanoparticles can be bonded on the UV texture layer, ensuring that the sprayed brightening layer and the UV texture layer can be well attached together, ensuring the brightening color development effect and durability.

[0016] Preferably, the raw materials of the brightening material include, by weight: amino silane coupling agent modified nanoparticles 5-20 parts, anti-settling agent 0-10 parts, solvent 80-100 parts.

[0017] Preferably, the nanoparticles are at least one of TiO2, SiO2, ZrO2, MnO2, Al2O3, ZnO or Cu2O, the amino silane coupling agent is at least one of 3-aminopropyl triethoxysilane, 3-(2-aminoethylamino) propyl trimethoxysilane or phenylaminomethyl triethoxysilane, the anti-settling agent is polyethylene wax or polyamide wax, and the solvent is at least one of ethanol, ethyl acetate, butyl acetate or propylene glycol methyl ether.

[0018] The application further provides a mobile phone battery cover, comprising: a cover plate body and the diaphragm or the diaphragm prepared by the preparation process. The diaphragm is adhered to the cover plate body by a glue layer.

[0019] Preferably, the cover plate body is any one of a plastic substrate, a glass substrate and a glass fiber composite substrate.

[0020] The application has the following beneficial effects: The application forms a texture layer on the surface of the PET diaphragm, and sets a sprayed brightening layer and an ink layer on the texture layer, which on the one hand gives the obtained diaphragm specific visual effects, and on the other hand replaces electroplated NCVM with sprayed brightening, which is simple in process, strong in replicability, meets the batch production conditions, fills the market gap and has no high-cost equipment investment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Structure diagram of the film based on spraying for realizing brightening according to the present application; Figure 2 Part of the physical diagram of the film based on spraying for realizing brightening according to the present application; Figure 3 Structure diagram of the film based on spraying for realizing brightening according to the present application; DETAILED DESCRIPTION

[0022] In the following, the present application will be described in detail through specific embodiments, but it should be made clear that these embodiments are used for illustration, but not to be interpreted as limiting the scope of the present application.

[0023] Embodiment 1 Reference Figure 1 The present embodiment provides a film based on spraying for realizing brightening, comprising: a body PET film, a UV texture layer, a spraying brightening layer and an ink layer. The UV texture layer is located on one side surface of the body PET film; the spraying brightening layer is located on one side surface of the UV texture layer away from the body PET film; and the ink layer is located on one side surface of the spraying brightening layer away from the UV texture layer.

[0024] The preparation process of the film based on spraying for realizing brightening comprises: (1) substrate preparation: providing a transparent body PET film; The thickness of the body PET film is 50 μm, the length matches the mobile phone battery cover, and one side surface of the body PET film further has an OCA adhesive layer with a thickness of 25 nm and a release film layer with a thickness of 100 μm; (2) UV transfer printing: forming a UV texture layer on the other side surface of the above-mentioned body PET film; The other side surface of the above-mentioned body PET film is coated with UV texture adhesive to form a stamping adhesive layer, and an initial texture layer is obtained by using a master mold to stamp, and a UV texture layer is obtained by curing the initial texture layer by light, the thickness of the UV texture layer is 10 μm, the light wavelength is 360-415 nm, and the curing energy is 100-800 mj / cm 3 ; The UV texture adhesive comprises the following raw materials by mass: tetra-functional polyester acrylate (Shenzhen Temeili 869) 20 parts, di-functional polyurethane acrylate (Guangdong Boxing B-216) 40 parts, active diluent (isobornyl acrylate) 20 parts, active diluent (dipropylene glycol diacrylate) 20 parts, adhesion promoting resin 15 parts, and photoinitiator (2,4,6-trimethylbenzoyl-diphenyl phosphine oxide) 2 parts; The promoting adhesion resin is prepared by the following method: adding bis(carboxymethyl)trithiocarbonate, o-hydroxybenzophenone and p-toluenesulfonic acid into toluene according to the molar ratio of 1:2:0.02, stirring and refluxing at 110℃ for 1h, washing with saturated NaHCO3 solution after cooling, drying to obtain the benzophenone group-containing molecular chain transfer agent; adding hexafluorobutyl methacrylate, 4-vinylbenzaldehyde, initiator azobisisobutyronitrile AIBN and the benzophenone group-containing molecular chain transfer agent into tetrahydrofuran according to the molar ratio of 60:40:1:5, stirring at 60℃ for 6h under nitrogen protection, precipitating and washing in n-hexane after cooling, and drying to obtain the promoting adhesion resin; The preparation method of the UV texture glue is as follows: under nitrogen protection, the tetrafunctional polyester acrylate, difunctional polyurethane acrylate, active dilution and promoting adhesion resin are added into a mixing kettle, stirred and mixed at room temperature for 2h, and then the photoinitiator is added and stirred and mixed for 0.5h to obtain the UV texture glue; (3) spraying: forming a spraying brightening layer on one side surface of the UV texture layer; The UV texture layer of the body PET film is sprayed with a brightening material on one side surface by using a spray gun, and heated and dried to obtain a spraying brightening layer, the thickness of the spraying brightening layer is 500nm, the heating and drying temperature is 150℃, and the time is 0.5h; The brightening material comprises the following raw materials by mass: 15 parts of amino silane coupling agent modified nanoparticles and 90 parts of solvent (ethanol); The amino silane coupling agent modified nanoparticles are prepared by the following method: adding nanoparticles (TiO2 with an average particle size of 100nm) and 3-aminopropyl triethoxysilane into a mixed solvent of ethanol and water (mass ratio of 30:5) according to the molar ratio of 1:0.2, refluxing in a water bath at 60℃ for 8h, reducing to room temperature, and then centrifuging and washing to obtain the amino silane coupling agent modified nanoparticles; The preparation method of the brightening material is as follows: adding the amino silane coupling agent modified nanoparticles into a solvent, and ultrasonic dispersing for 0.5h to obtain the brightening material; (4) silk printing: forming an ink layer on one side surface of the spraying brightening layer; The spraying brightening layer of the body PET film is printed with ink through a silk screen printing plate, and an ink layer is obtained after baking and curing, the thickness of the ink layer is 15μm, the baking and curing temperature is 200℃, and the time is 1h; (5) cutting: cutting to the required size according to the product structure; (6) package inspection and delivery: after the good products are inspected according to the inspection standard, the good products are packaged and delivered according to the standard packaging method.

[0025] Example 2 With reference to Figure 1 , this embodiment also proposes a film for realizing brightening based on spraying, which refers to embodiment 1, except that in the preparation process, the UV texture glue comprises the following raw materials in mass parts: tetrafunctional polyester acrylate (Shenzhen Temeili 869) 10 parts, ten functional polyurethane acrylate resin (Guangdong Boxing B-912) 50 parts, active diluent (isobornyl acrylate) 10 parts, active diluent (1, 6-hexanediol diacrylate) 20 parts, adhesion promoting resin 20 parts, and photoinitiator (1-hydroxy cyclohexyl phenyl ketone) 1 part. The brightening material comprises the following raw materials in mass parts: amino silane coupling agent modified nanoparticles 15 parts and solvent (ethanol) 90 parts. The amino silane coupling agent modified nanoparticles are prepared by the following method: nano particles (SiO2 with an average particle size of 50 nm) and 3- (2-aminoethylamino) propyl trimethoxysilane are added into a mixed solvent of ethanol and water (mass ratio of 30:5) at a molar ratio of 1:0.2, and then refluxed at 60°C for 8h in a water bath, and then cooled to room temperature. After centrifugal separation and washing, the amino silane coupling agent modified nanoparticles are obtained.

[0026] Example 3 With reference to Figure 1 , this embodiment also proposes a film for realizing brightening based on spraying, which refers to embodiment 1, except that in the preparation process, the UV texture glue comprises the following raw materials in mass parts: tetrafunctional polyester acrylate (Shenzhen Temeili 869) 10 parts, ten functional polyurethane acrylate resin (Guangdong Boxing B-912) 50 parts, active diluent (isobornyl acrylate) 10 parts, active diluent (1, 6-hexanediol diacrylate) 20 parts, adhesion promoting resin 20 parts, and photoinitiator (1-hydroxy cyclohexyl phenyl ketone) 1 part. The brightening material comprises the following raw materials in mass parts: amino silane coupling agent modified nanoparticles 15 parts and solvent (ethanol) 90 parts. The amino silane coupling agent modified nanoparticles are prepared by the following method: nano particles (SiO2 with an average particle size of 50 nm) and 3- (2-aminoethylamino) propyl trimethoxysilane are added into a mixed solvent of ethanol and water (mass ratio of 30:5) at a molar ratio of 1:0.2, and then refluxed at 60°C for 8h in a water bath, and then cooled to room temperature. After centrifugal separation and washing, the amino silane coupling agent modified nanoparticles are obtained.

[0027] Comparative example 1 The comparative example also proposes a film based on spraying to achieve brightening, which refers to Example 1, except that in the preparation process, the UV texture glue comprises the following mass parts of raw materials: tetrafunctional polyester acrylate (Shenzhen Temeili 869) 20 parts, difunctional polyurethane acrylate (Guangdong Boxing B-216) 40 parts, active diluent (isobornyl acrylate) 20 parts, active diluent (dipropylene glycol diacrylate) 20 parts, adhesion promoting resin 15 parts, and photoinitiator (2,4,6-trimethylbenzoyl-diphenyl phosphine oxide) 2 parts.

[0028] Comparative Example 2 The comparative example also proposes a film based on spraying to achieve brightening, which refers to Example 1, except that in the preparation process, the UV texture glue comprises the following mass parts of raw materials: tetrafunctional polyester acrylate (Shenzhen Temeili 869) 20 parts, difunctional polyurethane acrylate (Guangdong Boxing B-216) 40 parts, active diluent (isobornyl acrylate) 20 parts, active diluent (dipropylene glycol diacrylate) 20 parts, adhesion promoting resin 15 parts, and photoinitiator (2,4,6-trimethylbenzoyl-diphenyl phosphine oxide) 2 parts. The adhesion promoting resin is prepared by the following method: adding bis(carboxymethyl)trithiocarbonate, o-hydroxybenzophenone and p-toluenesulfonic acid into toluene in a molar ratio of 1:2:0.02, stirring and refluxing at 110°C for 1h, washing with saturated NaHCO3 solution after cooling, drying, and obtaining a molecular chain transfer agent containing a benzophenone group; adding hexafluorobutyl methacrylate, initiator azobisisobutyronitrile AIBN and molecular chain transfer agent containing benzophenone group into tetrahydrofuran in a molar ratio of 100:1:5, stirring at 60°C under nitrogen protection for 6h, precipitating and washing in n-hexane after cooling, and drying to obtain the adhesion promoting resin.

[0029] Comparative Example 3 The comparative example also proposes a film based on spraying to achieve brightening, which refers to Example 1, except that in the preparation process, the brightening material comprises the following mass parts of raw materials: amino silane coupling agent modified nanoparticles 15 parts, and solvent (ethanol) 90 parts. The amino silane coupling agent modified nanoparticles are prepared by the following method: adding nanoparticles (TiO2 with an average particle size of 100nm) and γ-(2,3-epoxypropoxy)propyl trimethoxysilane into a mixed solvent of ethanol and water (mass ratio of 30:5) in a molar ratio of 1:0.2, water bath refluxing at 60°C for 8h, reducing to room temperature, and obtaining the amino silane coupling agent modified nanoparticles after centrifugal separation and washing.

[0030] The performance of the UV texture layer and the sprayed brightening layer in the films of the examples and comparative examples is tested by the following method, and the results are shown in Table 1: Adhesion test: tested according to GB / T9286-1998 (crosshatch method); Friction resistance: tested by steel wool rubbing tester, 1000g pressure applied, speed 50 times / min; High pressure resistance: no cracking under 200℃ for 2min; Water boiling crosshatch: no peeling and no defect on surface under 100℃ for 2h.

[0031] Table 1 Performance of the film according to the examples and comparative examples

[0032] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited to this, and any person skilled in the art can make equivalent substitutions or changes according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A film for achieving brightening based on spraying, characterized by, Comprising: The body PET film, the UV texture layer, the spray brightening layer and the ink layer; The UV texture layer is on one side surface of the body PET film; the spray brightening layer is on one side surface of the UV texture layer away from the body PET film; the ink layer is on one side surface of the spray brightening layer away from the UV texture layer.

2. The film for achieving brightening based on spraying according to claim 1, wherein, The thickness of the body PET film is 25-100μm; the thickness of the UV texture layer is 5-20μm; the thickness of the spray brightening layer is 100-800nm; the thickness of the ink layer is 5-40μm.

3. A process for the production of a film for light enhancement by spraying according to claim 1 or 2, characterized in that Comprising: Providing a body PET film; Transferring UV texture glue on one side surface of the body PET film to form a UV texture layer; Spraying brightening material on one side surface of the UV texture layer away from the body PET film to form a spray brightening layer; Screen printing ink on one side surface of the spray brightening layer away from the UV texture layer to form an ink layer.

4. The process for producing a film for brightening by spraying according to claim 3, wherein The raw materials of the UV texture glue include, by weight fraction, 10-30 parts of polyester acrylate, 30-50 parts of polyurethane acrylate, 30-50 parts of active diluent, 5-20 parts of adhesion promoting resin and 1-5 parts of photoinitiator.

5. The process for producing a film for brightening by spraying according to claim 4, wherein The polyester acrylate is a three to eight functionality polyester acrylate; the polyurethane acrylate is a two to ten functionality polyurethane acrylate; the diluent is at least one of isobornyl methacrylate, N,N-dimethyl acrylamide, dipropylene glycol diacrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate or hydroxyethyl methacrylate; the photoinitiator is at least one of 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone or 2,4,6-trimethylbenzoyl phenyl phosphinic acid ethyl ester.

6. The process for producing a film for brightening by spraying according to claim 4 or 5, wherein The adhesion promoting resin is obtained by esterification condensation of bis(carboxymethyl)trithiocarbonate and o-hydroxybenzophenone, and then copolymerization of fluorine-containing acrylate and 4-vinyl benzaldehyde as chain transfer agent; The fluorine-containing acrylate is at least one of hexafluorobutyl methacrylate, dodecafluoroheptyl acrylate, tridecafluorooctyl acrylate or trifluoroethyl methacrylate.

7. Process for the production of a film for light enhancement by means of spraying according to any one of claims 3 to 6, characterized in that The raw materials of the brightening material include, by weight fraction, 5-20 parts of amino silane coupling agent modified nanoparticles, 0-10 parts of anti-settling agent and 80-100 parts of solvent.

8. The process for producing a film for brightening by spraying according to claim 7, wherein The nanoparticles are at least one of TiO2, SiO2, ZrO2, MnO2, Al2O3, ZnO or Cu2O, the amino silane coupling agent is at least one of 3-aminopropyl triethoxysilane, 3-(2-aminoethylamino)propyl trimethoxysilane or phenylaminomethyl triethoxysilane, the anti-settling agent is polyethylene wax or polyamide wax, and the solvent is at least one of ethanol, ethyl acetate, butyl acetate or propylene glycol methyl ether.

9. A mobile phone battery cover, characterized by, Comprising: The cover plate body and the film of claim 1 or 2 or the film prepared by the preparation process of any one of claims 1-8; The film is adhered to the cover plate body by the adhesive layer.

10. The cell phone battery cover of claim 9, wherein, The cover plate body is any one of a plastic substrate, a glass substrate, and a glass fiber composite substrate. The cover plate body is any one of a plastic substrate, a glass substrate, and a glass fiber composite substrate.

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