A printing process for a back logo of a mobile phone shell with wear-resistant touch effect

Abstract

The present application belongs to the technical field of ink printing, and particularly relates to a printing process for a back logo of a mobile phone shell with wear-resistant touch effect, comprising the following steps: providing a mobile phone shell PC plate substrate; printing an adhesive layer on the outer surface of the mobile phone shell PC plate substrate; printing a silica gel logo layer on the adhesive layer by means of heat transfer printing, the raw material of the silica gel logo layer being wear-resistant touch silica gel ink, the wear-resistant touch silica gel ink comprising the following components in parts by weight: modified acrylic resin 50-70 parts, pigment 10-15 parts, defoaming agent 2-3 parts, dispersing agent 1.8-3.0 parts, leveling agent 1.8-3.0 parts, deionized water 20-30 parts and ethanol 15-22 parts; S400: printing a transparent film layer above the silica gel logo layer. The present application forms a silica gel logo layer with 3D or convex effects on the mobile phone shell PC plate substrate by heat transfer printing technology, thereby improving the touch and having wear-resistant effect.

Description

Technical Field

[0001] This invention belongs to the field of ink printing technology, and in particular relates to a printing process for the back markings of mobile phone cases that provides a wear-resistant feel. Background Technology

[0002] To enhance their aesthetic appeal, existing phone case backs often need to be more avant-garde. This is typically achieved by incorporating logos, trademarks, or other patterns and textures into the case. Current methods usually employ one-piece injection molding, directly applying two or more colors to the back of the case. However, these cases are generally flat, making it impossible to create a 3D raised effect for the logos, trademarks, or other patterns and textures, thus failing to meet users' desire for a raised feel. Conversely, directly creating a raised effect for the logos, trademarks, or other patterns and textures during injection molding presents problems such as poor wear resistance and the presence of burrs and sharp edges, which urgently need to be addressed. Summary of the Invention

[0003] The purpose of this invention is to provide a printing process for phone case back markings that provides a wear-resistant feel. This process involves printing wear-resistant silicone ink onto a PC substrate of the phone case to form a silicone marking layer with a 3D raised effect, thus enhancing the overall feel of the markings on the back of the phone case. Furthermore, this invention modifies the surface of the talc powder in the wear-resistant silicone ink, ensuring good compatibility with ink components such as acrylic resin. The modified talc powder is evenly dispersed in the ink, preventing agglomeration and sedimentation, thereby guaranteeing the stability and printing effect of the wear-resistant silicone ink. This significantly improves the wear resistance and feel of the ink, resulting in printed products that are both aesthetically pleasing and durable and comfortable.

[0004] To achieve the above objectives, this invention provides a mobile phone case back label printing process with a wear-resistant feel, comprising the following steps:

[0005] S100: Provides PC board substrate for mobile phone cases;

[0006] S200: An adhesive layer is printed on the outer surface of the PC board substrate of the mobile phone case;

[0007] S300: A silicone marking layer is printed onto the adhesive layer by heat transfer. The raw material of the silicone marking layer is abrasion-resistant, tactile silicone ink. The abrasion-resistant, tactile silicone ink comprises the following components by weight: 50-70 parts modified acrylic resin, 10-15 parts pigment, 2-3 parts defoamer, 1.8-3.0 parts dispersant, 1.8-3.0 parts leveling agent, 20-30 parts deionized water, and 15-22 parts ethanol.

[0008] S400: A transparent film layer is printed on top of the silicone marking layer.

[0009] As a preferred embodiment of the present invention, in step S300, the modified acrylic resin is prepared through the following steps:

[0010] S310: Glycidyl methacrylate, sucrose fatty acid ester and isobutanol are mixed and dispersed to obtain a mixture;

[0011] S320: After mixing and dispersing acrylic monomers, functional fillers, sodium dodecyl sulfate, initiator and deionized water and preheating, the mixture is slowly added to the solution and stirred at a constant temperature. After cooling and adjusting the pH value, the modified acrylic resin is obtained.

[0012] As a preferred embodiment of the present invention, in step S310, the mass ratio of glycidyl methacrylate, sucrose fatty acid ester and isobutanol is 6-8:1.5-1.8:3-4.

[0013] In step S320, the mass ratio of the acrylic monomer, functional filler, sodium dodecyl sulfate, initiator, deionized water and mixture is 50-55:8-10:1.5-2.1:0.5-0.6:25-30:10-13.

[0014] As a preferred embodiment of the present invention, in step S320, the preheating is to raise the temperature to 60-65℃; the constant temperature stirring is to stir at 65-70℃ for 1.5-2.0h; the cooling is to cool to 40-45℃; the pH adjustment is to adjust the pH value to 7.5; the acrylic monomer is composed of methacrylic acid, ethyl methacrylate and hydroxyethyl acrylate in a mass ratio of 6.5-7.2:11-13:0.8-1.2.

[0015] As a preferred embodiment of the present invention, the functional filler is prepared through the following steps:

[0016] S321: Add talc powder to anhydrous ethanol and mix well. Add silane coupling agent, heat and stir. After removing the solvent by rotary evaporation, wash and place in an oven for vacuum drying to obtain silane-modified talc powder.

[0017] S322: Mix silane-modified talc, methacrolein and anhydrous ethanol, add initiator and heat to polymerize, centrifuge to collect the solid, wash, place in an oven and vacuum dry to obtain the pre-made filler;

[0018] S323: Cinnamyl alcohol, p-aminothiophenol and anhydrous ethanol are ultrasonically mixed, then a photoinitiator is added and treated with ultraviolet light. The product is washed with water and dried to obtain the modified monomer.

[0019] S324: The modified monomer is added to isobutanol and mixed well. The pre-made filler is added and stirred at a constant temperature. After filtration, washing, and vacuum drying in an oven, the functional filler is obtained.

[0020] As a preferred embodiment of the present invention, in S321, the mass ratio of talc, anhydrous ethanol, and silane coupling agent is 20-23:70-80:5.2-6.5; the silane coupling agent is vinyltrimethoxysilane; the heating and stirring is carried out at 55-65°C for 6-8 hours; the washing is carried out three times with anhydrous ethanol; and the vacuum drying is carried out at 70°C under vacuum until constant weight.

[0021] As a preferred embodiment of the present invention, in step S322, the mass ratio of the silane-modified talc, methacrolein, anhydrous ethanol, and initiator is 18-20:2.1-2.5:50-60:0.14-0.16; the heating polymerization is carried out by stirring at 70-75°C for 10-12 hours; the washing is carried out by washing with anhydrous ethanol 4 times; and the vacuum drying is carried out by vacuum drying at 60°C to constant weight.

[0022] As a preferred embodiment of the present invention, in step S323, the mass ratio of cinnamyl alcohol, p-aminothiophenol, anhydrous ethanol and photoinitiator is 3.2-3.6: 2.1-2.4: 15-20: 0.15-0.16; the ultrasonic mixing is performed by ultrasonication at 400-600W power for 10-15 minutes; and the ultraviolet irradiation treatment is performed by reacting under 365nm ultraviolet light for 6-8 hours.

[0023] As a preferred embodiment of the present invention, in step S324, the mass ratio of the modified monomer, isobutanol, and pre-made filler is 2.1-2.5:70-80:20-22; the constant temperature stirring is carried out at 42-50℃ for 5-6 hours; the washing is carried out three times with anhydrous ethanol; and the vacuum drying is carried out at 80℃ to constant weight. After mixing the agent and leveling agent, the mixture is stirred at 300-400 rpm for 30-40 minutes and then ground to obtain the final product.

[0024] The above-mentioned technical solutions in the mobile phone case back label printing process with wear-resistant feel provided by the embodiments of the present invention have at least one of the following technical effects: The mobile phone case back label printing process with wear-resistant feel in the present invention, through a specific preparation process, can form a 3D raised silicone label layer on the back of the mobile phone case. This silicone label layer uses wear-resistant silicone ink as a raw material. The wear-resistant silicone ink undergoes surface modification treatment to make it compatible with ink components such as acrylic resin. The modified talc powder can be uniformly dispersed in the ink, avoiding agglomeration and sedimentation, thereby ensuring the stability of the ink and the printing effect, significantly improving the wear resistance and feel of the ink, so that the printed product maintains its aesthetic appeal while also possessing better durability and comfort. This achieves the formation of raised logos, trademarks, and other patterns on the back of the mobile phone case, while also ensuring that the raised logos, trademarks, and other patterns have a good wear-resistant feel. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0026] The present invention provides a printing process for the back marking of a mobile phone case that provides a wear-resistant feel, comprising the following steps:

[0027] S100: Provides PC board substrate for mobile phone cases;

[0028] S200: An adhesive layer is printed on the outer surface of the PC board substrate of the mobile phone case;

[0029] S300: A silicone logo layer is printed onto the adhesive layer using a heat transfer method. First, the desired pattern can be printed on heat transfer paper (e.g., polypropylene paper) using a heat transfer machine. The silicone logo layer is made of wear-resistant, tactile silicone ink. The wear-resistant, tactile silicone ink is printed on the heat transfer paper to create a specific 3D raised effect. Then, the heat transfer paper is transferred to the adhesive layer formed on the PC board substrate of the phone case using a hot stamping machine, thus forming the logo on the back of the phone case. The adhesive layer can be made of hot melt adhesive.

[0030] The wear-resistant, hand-feeling silicone ink comprises the following components by weight: 50-70 parts modified acrylic resin, 10-15 parts pigment, 2-3 parts defoamer, 1.8-3.0 parts dispersant, 1.8-3.0 parts leveling agent, 20-30 parts deionized water, and 15-22 parts ethanol.

[0031] S400: A transparent film layer is printed on top of the silicone marking layer. The transparent film layer can be made of TPE or TPU material.

[0032] The purpose of this invention is to provide a printing process for phone case back markings that offers a durable and tactile feel. This process involves printing durable silicone ink onto a PC substrate of the phone case to form a silicone marking layer with a 3D raised effect, thus enhancing the overall tactile feel of the markings on the back of the phone case. Crucially, the resulting 3D raised silicone marking layer is also durable, offering significantly better feel and durability than directly injection-molded phone cases with patterns or markings.

[0033] It should be further noted that for other printed materials bearing logos or trademarks, the abrasion resistance of cured acrylic inks ensures that the logos or trademarks are not easily worn or scratched, thus maintaining the overall aesthetics and brand value of the printed materials. Furthermore, the environmental friendliness and good adhesion of acrylic inks are also important reasons for their widespread use in these applications. Talc, as an important additive, plays a crucial role in acrylic inks. It not only improves the abrasion resistance of the ink but also gives it a smoother feel. Adding an appropriate amount of talc to the ink allows it to form a more robust coating after curing, effectively resisting external wear and scratches. However, the compatibility of talc with acrylic inks has always been a key factor limiting its widespread application in inks.

[0034] Because this invention modifies the surface of talc powder in abrasion-resistant silicone ink, it achieves good compatibility with ink components such as acrylic resin. The modified talc powder can be uniformly dispersed in the ink, avoiding agglomeration and sedimentation. This ensures the stability and printing effect of the abrasion-resistant silicone ink, significantly improving its abrasion resistance and feel. As a result, printed materials maintain their aesthetic appeal while also possessing better durability and comfort. The following describes several embodiments of a mobile phone case back label printing process with an abrasion-resistant feel provided by this invention.

[0035] Example 1.

[0036] This embodiment of a mobile phone case back label printing process with a wear-resistant feel includes the following steps:

[0037] S100: Provides PC board substrate for mobile phone cases;

[0038] S200: An adhesive layer is printed on the outer surface of the PC board substrate of the mobile phone case;

[0039] S300: A silicone marking layer is printed onto the adhesive layer by heat transfer. The raw material of the silicone marking layer is wear-resistant, tactile silicone ink. The wear-resistant, tactile silicone ink comprises the following components by weight: 50 parts modified acrylic resin, 10 parts pigment, 2 parts defoamer, 1.8 parts dispersant, 1.8 parts leveling agent, 20 parts deionized water, and 15 parts ethanol.

[0040] The pigment is titanium dioxide; the defoamer is polyoxyethylene polyoxypropylene pentaerythritol ether; the dispersant is a mixture of sodium dodecyl sulfate and oleamide in a mass ratio of 2.0:1.0; and the leveling agent is polydimethylsiloxane.

[0041] The preparation method of the modified acrylic resin includes the following steps:

[0042] S310: Glycidyl methacrylate, sucrose fatty acid ester and isobutanol are mixed and dispersed to obtain a mixture; wherein the mass ratio of glycidyl methacrylate, sucrose fatty acid ester and isobutanol is 6:1.5:3;

[0043] S320: Acrylic monomers, functional fillers, sodium dodecyl sulfate, initiator, and deionized water are mixed and dispersed, and preheated to 60°C. The mixture is then slowly added and stirred at 65°C for 1.5 hours. After cooling to 40°C and adjusting the pH to 7.5, a modified acrylic resin is obtained. The mass ratio of the acrylic monomers, functional fillers, sodium dodecyl sulfate, initiator, deionized water, and mixture is 50:8:1.5:0.5:25:10. The initiator is ammonium persulfate. The acrylic monomers are composed of methacrylic acid, ethyl methacrylate, and hydroxyethyl acrylate in a mass ratio of 6.5:11:0.8.

[0044] The preparation method of the functional filler includes the following steps:

[0045] S321: Add talc powder to anhydrous ethanol and mix well. Add silane coupling agent, heat to 55℃ and stir for 6 hours. After removing the solvent by rotary evaporation, wash three times with anhydrous ethanol, and place in an oven to vacuum dry at 70℃ to constant weight to obtain silane-modified talc powder. The mass ratio of talc powder, anhydrous ethanol and silane coupling agent is 20:70:5.2. The silane coupling agent is vinyltrimethoxysilane.

[0046] S322: Silane-modified talc, methacrolein, and anhydrous ethanol are mixed, an initiator is added, and the mixture is stirred at 70°C for 10 hours. The solid is collected by centrifugation, washed four times with anhydrous ethanol, and then placed in an oven and vacuum dried at 60°C to constant weight to obtain the pre-made filler. The mass ratio of silane-modified talc, methacrolein, anhydrous ethanol, and the initiator is 18:2.1:50:0.14. The initiator is azobisisobutyronitrile (AIBN).

[0047] S323: Cinnamyl alcohol, p-aminothiophenol, and anhydrous ethanol were ultrasonicated at 400W for 10 min, then a photoinitiator was added and reacted under 365nm ultraviolet light for 6 h. The product was washed three times with water and dried with anhydrous magnesium sulfate to obtain the modified monomer. The mass ratio of cinnamyl alcohol, p-aminothiophenol, anhydrous ethanol, and photoinitiator was 3.2:2.1:15:0.15. The photoinitiator was 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0048] S324: The modified monomer is added to isobutanol and mixed evenly. The pre-made filler is added and stirred at 42°C for 5 hours. The mixture is then filtered, washed three times with anhydrous ethanol, and placed in an oven to be vacuum dried at 80°C until constant weight, thus obtaining the functional filler. The mass ratio of the modified monomer, isobutanol and pre-made filler is 2.1:70:20.

[0049] S400: A transparent film layer is printed on top of the silicone marking layer.

[0050] Furthermore, the preparation method of the wear-resistant, hand-feel silicone ink includes the following steps: mixing modified acrylic resin, deionized water, ethanol, pigment, defoamer, dispersant and leveling agent, stirring at 300 rpm for 30 minutes, and grinding to obtain the ink.

[0051] Example 2.

[0052] This embodiment of a mobile phone case back label printing process with a wear-resistant feel includes the following steps:

[0053] S100: Provides PC board substrate for mobile phone cases;

[0054] S200: An adhesive layer is printed on the outer surface of the PC board substrate of the mobile phone case;

[0055] S300: A silicone marking layer is printed onto the adhesive layer by heat transfer. The raw material of the silicone marking layer is wear-resistant tactile silicone ink. The wear-resistant tactile silicone ink comprises the following components by weight: 60 parts modified acrylic resin, 12 parts pigment, 2.5 parts defoamer, 2.4 parts dispersant, 2.4 parts leveling agent, 25 parts deionized water, and 18 parts ethanol.

[0056] The pigment is titanium dioxide; the defoamer is polyoxyethylene polyoxypropylene pentaerythritol ether; the dispersant is a mixture of sodium dodecyl sulfate and oleamide in a mass ratio of 2.4:1.2; and the leveling agent is polydimethylsiloxane.

[0057] The preparation method of the modified acrylic resin includes the following steps:

[0058] S310: Glycidyl methacrylate, sucrose fatty acid ester and isobutanol are mixed and dispersed to obtain a mixture; wherein the mass ratio of glycidyl methacrylate, sucrose fatty acid ester and isobutanol is 7:1.6:3.5;

[0059] S320: Acrylic monomers, functional fillers, sodium dodecyl sulfate, initiator, and deionized water are mixed and dispersed, preheated to 62°C, and then slowly added to the mixture. The mixture is stirred at 68°C for 1.8 hours, cooled to 42°C, and the pH value is adjusted to 7.5 to obtain modified acrylic resin. The mass ratio of the acrylic monomers, functional fillers, sodium dodecyl sulfate, initiator, deionized water, and mixture is 52:9:1.8:0.55:28:12. The initiator is ammonium persulfate. The acrylic monomers are composed of methacrylic acid, ethyl methacrylate, and hydroxyethyl acrylate in a mass ratio of 6.8:12:1.

[0060] The preparation method of the functional filler includes the following steps:

[0061] S321: Add talc powder to anhydrous ethanol and mix well. Add silane coupling agent, heat to 60℃ and stir for 7 hours. After removing the solvent by rotary evaporation, wash three times with anhydrous ethanol, and place in an oven to vacuum dry at 70℃ to constant weight to obtain silane-modified talc powder. The mass ratio of talc powder, anhydrous ethanol and silane coupling agent is 22:75:5.8. The silane coupling agent is vinyltrimethoxysilane.

[0062] S322: Silane-modified talc, methacrolein, and anhydrous ethanol are mixed, an initiator is added, and the mixture is stirred at 72°C for 11 hours. The solid is collected by centrifugation, washed four times with anhydrous ethanol, and then placed in an oven and vacuum dried at 60°C to constant weight to obtain the pre-made filler. The mass ratio of silane-modified talc, methacrolein, anhydrous ethanol, and initiator is 19:2.3:55:0.15. The initiator is azobisisobutyronitrile (AIBN).

[0063] S323: Cinnamyl alcohol, p-aminothiophenol, and anhydrous ethanol were ultrasonicated at 500W for 12 min, then a photoinitiator was added and reacted under 365nm ultraviolet light for 7 h. The product was washed three times with water and dried with anhydrous magnesium sulfate to obtain the modified monomer. The mass ratio of cinnamyl alcohol, p-aminothiophenol, anhydrous ethanol, and photoinitiator was 3.4:2.2:18:0.155. The photoinitiator was 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0064] S324: The modified monomer is added to isobutanol and mixed evenly. The pre-made filler is added and stirred at 46°C for 5.5 h. The mixture is then filtered, washed three times with anhydrous ethanol, and placed in an oven to be vacuum dried at 80°C to constant weight to obtain the functional filler. The mass ratio of the modified monomer, isobutanol and pre-made filler is 2.3:75:21.

[0065] S400: A transparent film layer is printed on top of the silicone marking layer.

[0066] Furthermore, the preparation method of the wear-resistant, hand-feel silicone ink includes the following steps: mixing modified acrylic resin, deionized water, ethanol, pigment, defoamer, dispersant and leveling agent, stirring at 300 rpm for 30 minutes, and grinding to obtain the ink.

[0067] Example 3.

[0068] This embodiment of a mobile phone case back label printing process with a wear-resistant feel includes the following steps:

[0069] S100: Provides PC board substrate for mobile phone cases;

[0070] S200: An adhesive layer is printed on the outer surface of the PC board substrate of the mobile phone case;

[0071] S300: A silicone marking layer is printed onto the adhesive layer by heat transfer. The raw material of the silicone marking layer is wear-resistant tactile silicone ink. The wear-resistant tactile silicone ink comprises the following components by weight: 70 parts modified acrylic resin, 15 parts pigment, 3 parts defoamer, 3.0 parts dispersant, 3.0 parts leveling agent, 30 parts deionized water, and 22 parts ethanol.

[0072] The pigment is titanium dioxide; the defoamer is polyoxyethylene polyoxypropylene pentaerythritol ether; the dispersant is a mixture of sodium dodecyl sulfate and oleamide in a mass ratio of 2.8:1.3; and the leveling agent is polydimethylsiloxane.

[0073] The preparation method of the modified acrylic resin includes the following steps:

[0074] S310: Glycidyl methacrylate, sucrose fatty acid ester and isobutanol are mixed and dispersed to obtain a mixture; wherein the mass ratio of glycidyl methacrylate, sucrose fatty acid ester and isobutanol is 8:1.8:4;

[0075] S320: Acrylic monomers, functional fillers, sodium dodecyl sulfate, initiator, and deionized water are mixed and dispersed, preheated to 65°C, and then slowly added to the mixture. The mixture is stirred at 70°C for 2.0 hours, cooled to 45°C, and the pH value is adjusted to 7.5 to obtain modified acrylic resin. The mass ratio of the acrylic monomers, functional fillers, sodium dodecyl sulfate, initiator, deionized water, and mixture is 55:10:2.1:0.6:30:13. The initiator is ammonium persulfate. The acrylic monomers are composed of methacrylic acid, ethyl methacrylate, and hydroxyethyl acrylate in a mass ratio of 7.2:13:1.2.

[0076] The preparation method of the functional filler includes the following steps:

[0077] S321: Add talc powder to anhydrous ethanol and mix well. Add silane coupling agent, heat to 65℃ and stir for 8 hours. After removing the solvent by rotary evaporation, wash three times with anhydrous ethanol, and place in an oven to vacuum dry at 70℃ to constant weight to obtain silane-modified talc powder. The mass ratio of talc powder, anhydrous ethanol and silane coupling agent is 23:80:6.5. The silane coupling agent is vinyltrimethoxysilane.

[0078] S322: Silane-modified talc, methacrolein, and anhydrous ethanol are mixed, an initiator is added, and the mixture is stirred at 75°C for 12 hours. The solid is collected by centrifugation, washed four times with anhydrous ethanol, and then placed in an oven and vacuum dried at 60°C to constant weight to obtain the pre-made filler. The mass ratio of silane-modified talc, methacrolein, anhydrous ethanol, and initiator is 20:2.5:60:0.16. The initiator is azobisisobutyronitrile (AIB).

[0079] S323: Cinnamyl alcohol, p-aminothiophenol, and anhydrous ethanol were ultrasonicated at 600W for 15 min, then a photoinitiator was added and reacted under 365nm ultraviolet light for 8 h. The product was washed three times with water and dried with anhydrous magnesium sulfate to obtain the modified monomer. The mass ratio of cinnamyl alcohol, p-aminothiophenol, anhydrous ethanol, and photoinitiator was 3.6:2.4:20:0.16. The photoinitiator was 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0080] S324: The modified monomer is added to isobutanol and mixed evenly. The pre-made filler is added and stirred at 50°C for 6 hours. The mixture is then filtered, washed three times with anhydrous ethanol, and placed in an oven to be vacuum dried at 80°C until constant weight, thus obtaining the functional filler. The mass ratio of the modified monomer, isobutanol and pre-made filler is 2.5:80:22.

[0081] S400: A transparent film layer is printed on top of the silicone marking layer.

[0082] Furthermore, the preparation method of the wear-resistant, hand-feel silicone ink includes the following steps: mixing modified acrylic resin, deionized water, ethanol, pigment, defoamer, dispersant and leveling agent, stirring at 300 rpm for 30 minutes, and grinding to obtain the ink.

[0083] The following comparative examples further illustrate a mobile phone case back label printing process with a wear-resistant feel.

[0084] Comparative Example 1.

[0085] Compared with Example 3, Comparative Example 1 differs in that methacrylic acid is used instead of glycidyl methacrylate, while the other components, preparation steps and parameters are the same.

[0086] Comparative Example 2.

[0087] Compared with Example 3, Comparative Example 2 differs in that the mass ratio of talc, anhydrous ethanol and silane coupling agent in Comparative Example 2 is 23:80:3, while the other components, preparation steps and parameters are the same.

[0088] Comparative Example 3.

[0089] Compared with Example 3, Comparative Example 3 differs in that vinyltrimethoxysilane is not used, while the other components, preparation steps and parameters are the same.

[0090] Comparative Example 4.

[0091] Compared with Example 3, Comparative Example 4 differs in that it does not use methacrolein, while the other components, preparation steps and parameters are the same.

[0092] Comparative Example 5.

[0093] Compared with Example 3, Comparative Example 5 differs in that step S323 is omitted, and p-aminothiophenol is used instead of the modified monomer, while the remaining components, preparation steps and parameters are the same.

[0094] Comparative Example 6.

[0095] Compared with Example 3, Comparative Example 6 differs in that steps S323 and S324 are omitted, and the pre-filler and cinnamyl alcohol are mixed at a mass ratio of 2.5:22. The remaining components, preparation steps and parameters are the same.

[0096] The inks prepared in Examples 1-3 and Comparative Examples 1-6 were tested as follows, and the test results are shown in Table 1.

[0097] Hardness test: according to GB / T 6739;

[0098] Light aging test: In the xenon lamp aging tester, the standard temperature of the dark room was set to 100℃, the temperature inside the laboratory was maintained at 65℃, the relative humidity of the air was 20%, and the radiation intensity was set to 60W / m². 2 The test lasted for 130 hours.

[0099] Table 1

[0100] hardness Light aging resistance test Example 1 4H No fading, no cracking, no bubbling Example 2 4H No fading, no cracking, no bubbling Example 3 4H No fading, no cracking, no bubbling Comparative Example 1 3H Slight fading, minor cracks, minor bubbling Comparative Example 2 3H Slight fading, minor cracks, minor bubbling Comparative Example 3 2H Severe fading, numerous cracks, and extensive bubbling Comparative Example 4 3H Partial fading, numerous cracks, and extensive bubbling. Comparative Example 5 3H Slight fading, minor cracks, minor bubbling Comparative Example 6 2H Severe fading, numerous cracks, and extensive bubbling

[0101] As can be seen from the test results in Table 1, compared with Comparative Examples 1-6, the wear-resistant silicone ink prepared in step S300 of the present invention has excellent hardness and aging resistance.

[0102] In step S300 of this invention, the surface of talc powder is hydrophobically modified by a silane coupling agent, introducing activated carbon-carbon double bonds that can form covalent bonds with methacrolein. Methacrolein has good compatibility with acrylic resin, which can increase the dispersibility and interfacial bonding strength of talc powder in the ink system. After cinnamyl alcohol is modified with p-aminothiophenol and then grafted with pre-made fillers, a highly stable Schiff base structure and benzene ring structure can be introduced, which can effectively increase the density and stability of the cross-linked network structure of the ink system and improve the wear resistance of the ink. At the same time, the hydroxyl groups contained in cinnamyl alcohol can increase the bonding strength with the epoxy groups of glycidyl methacrylate, further increasing the binding force of talc powder in the system and further increasing the wear resistance and mechanical properties of the ink. Talc powder contains magnesium silicate, which has excellent thermal stability and infrared and ultraviolet blocking properties. By modifying talc powder and increasing its dispersibility, the aging resistance of the ink can be effectively increased.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A printing process for the back logo of a mobile phone case with a wear-resistant feel, characterized in that, Includes the following steps: S100: Provides PC board substrate for mobile phone cases; S200: An adhesive layer is printed on the outer surface of the PC board substrate of the mobile phone case; S300: A silicone marking layer is printed onto the adhesive layer by heat transfer. The raw material of the silicone marking layer is abrasion-resistant, tactile silicone ink. The abrasion-resistant, tactile silicone ink comprises the following components by weight: 50-70 parts modified acrylic resin, 10-15 parts pigment, 2-3 parts defoamer, 1.8-3.0 parts dispersant, 1.8-3.0 parts leveling agent, 20-30 parts deionized water, and 15-22 parts ethanol. In step S300, the modified acrylic resin is prepared by the following steps: S310: Glycidyl methacrylate, sucrose fatty acid ester and isobutanol are mixed and dispersed to obtain a mixture; S320: After mixing and dispersing acrylic monomers, functional fillers, sodium dodecyl sulfate, initiator and deionized water and preheating, the mixture is slowly added to the solution and stirred at a constant temperature. After cooling and adjusting the pH value, the modified acrylic resin is obtained. The functional filler is prepared by the following steps: S321: Add talc powder to anhydrous ethanol and mix well. Add silane coupling agent, heat and stir. After removing the solvent by rotary evaporation, wash and place in an oven for vacuum drying to obtain silane-modified talc powder. S322: Mix silane-modified talc, methacrolein and anhydrous ethanol, add initiator and heat to polymerize, centrifuge to collect the solid, wash, place in an oven and vacuum dry to obtain the pre-made filler; S323: Cinnamyl alcohol, p-aminothiophenol and anhydrous ethanol are ultrasonically mixed, then a photoinitiator is added and treated with ultraviolet light. The product is washed with water and dried to obtain the modified monomer. S324: The modified monomer is added to isobutanol and mixed well. The pre-made filler is added and stirred at a constant temperature. After filtration, washing, and vacuum drying in an oven, the functional filler is obtained. S400: A transparent film layer is printed on top of the silicone marking layer.

2. The mobile phone case back label printing process with wear-resistant feel as described in claim 1, characterized in that: In step S310, the mass ratio of glycidyl methacrylate, sucrose fatty acid ester and isobutanol is 6-8:1.5-1.8:3-4; In step S320, the mass ratio of the acrylic monomer, functional filler, sodium dodecyl sulfate, initiator, deionized water and mixture is 50-55:8-10:1.5-2.1:0.5-0.6:25-30:10-13.

3. The mobile phone case back label printing process with wear-resistant feel according to claim 2, characterized in that: In step S320, the preheating is to raise the temperature to 60-65℃; the constant temperature stirring is to stir at 65-70℃ for 1.5-2.0h; the cooling is to cool to 40-45℃; the pH adjustment is to adjust the pH value to 7.5; the acrylic monomer is composed of methacrylic acid, ethyl methacrylate and hydroxyethyl acrylate in a mass ratio of 6.5-7.2:11-13:0.8-1.

2.

4. The mobile phone case back label printing process with wear-resistant feel as described in claim 1, characterized in that: In S321, the mass ratio of talc, anhydrous ethanol, and silane coupling agent is 20-23:70-80:5.2-6.5; the silane coupling agent is vinyltrimethoxysilane; the heating and stirring is carried out at 55-65℃ for 6-8 hours; the washing is carried out 3 times with anhydrous ethanol; and the vacuum drying is carried out at 70℃ under vacuum until constant weight.

5. The mobile phone case back label printing process with wear-resistant feel according to claim 1, characterized in that: In step S322, the mass ratio of the silane-modified talc, methacrolein, anhydrous ethanol, and initiator is 18-20:2.1-2.5:50-60:0.14-0.16; the heating polymerization is carried out by stirring at 70-75℃ for 10-12 hours; the washing is carried out by washing with anhydrous ethanol 4 times; and the vacuum drying is carried out by vacuum drying at 60℃ to constant weight.

6. The mobile phone case back label printing process with wear-resistant feel according to claim 1, characterized in that: In step S323, the mass ratio of cinnamyl alcohol, p-aminothiophenol, anhydrous ethanol, and photoinitiator is 3.2-3.6: 2.1-2.4: 15-20: 0.15-0.16; the ultrasonic mixing is performed by ultrasonication at 400-600W power for 10-15 minutes; and the ultraviolet irradiation treatment is performed by reacting under 365nm ultraviolet light for 6-8 hours.

7. The mobile phone case back label printing process with wear-resistant feel according to claim 1, characterized in that: In step S324, the mass ratio of the modified monomer, isobutanol and pre-made filler is 2.1-2.5:70-80:20-22; the constant temperature stirring is carried out at 42-50℃ for 5-6 hours; the washing is carried out with anhydrous ethanol three times; and the vacuum drying is carried out at 80℃ to constant weight.