Mobile phone middle frame with texture effect and manufacturing process thereof

Abstract

The invention discloses a mobile phone middle frame with a texture effect and a manufacturing process thereof, and relates to the technical field of 3C electronic manufacturing. The 3D vacuum laminating process and the texture effect membrane are applied to the appearance effect decoration of the mobile phone middle frame structural member, so that the mobile phone middle frame has a colorful texture effect, multiple texture changes and a strong texture color effect and is suitable for different user requirements, and the appearance hand feeling effect of the middle frame can select an outer texture effect according to the user requirements; the requirements of consumers can be comprehensively met; and moreover, the process does not use a traditional spraying process, so that emission of volatile organic compounds (VOC) is avoided, and the production process is more environment-friendly.

Description

Technical Field

[0001] This invention relates to the field of 3C electronic manufacturing technology, specifically a mobile phone frame with a textured effect and its manufacturing process. Background Technology

[0002] In today's era of ubiquitous smartphones, appearance design has become a crucial factor for consumers when making purchasing decisions. As a key component of the overall visual presentation, the craftsmanship and aesthetics of the phone's frame are receiving increasing attention. With continuous advancements in smartphone manufacturing processes, color usage has become richer, more flexible, and more varied, with a wide range of vibrant and diverse textures becoming eye-catching highlights. These well-designed aesthetics better satisfy consumers' pursuit of personalization and style, adding more visual enjoyment and color to users' daily lives.

[0003] However, existing technologies and traditional spraying techniques result in shortcomings in the appearance of mobile phone frames. Firstly, traditional spraying produces a monotonous and rigid appearance, lacking depth and variation. It lacks unique textures and cannot achieve vibrant visual effects. Frame colors under this process are often limited to simple solid colors, failing to meet consumers' demands for diverse and personalized appearances. It is visually unappealing and out of step with the current market trend of pursuing rich visual experiences, making it difficult to provide users with a sense of novelty and satisfaction. Secondly, the coating quality obtained through traditional spraying is poor, and the spraying process emits high levels of VOCs (volatile organic compounds), failing to meet environmental protection requirements.

[0004] In conclusion, developing a textured mobile phone frame and its manufacturing process is of practical significance. Summary of the Invention

[0005] The purpose of this invention is to provide a mobile phone frame with a textured effect and its manufacturing process, so as to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A manufacturing process for a textured mobile phone frame includes the following steps: Step 1: Transfer a release agent with an external texture effect onto the base film to form a release film; then apply a hardening liquid to its surface and UV cure to form a hardened layer; Step 2: Screen print transparent varnish on the hardened layer in Step 1 to form a varnish layer; then sequentially transfer a UV inner texture layer, electroplat to form a coating layer, screen print a base ink layer, and dry to obtain a textured material; Step 3: Apply adhesive to the base ink layer of the textured material and attach the phone frame workpiece to it; remove the base film and release film to obtain the phone frame with textured effect.

[0007] Ideally, the base film is a high-strength dielectric film, including one of ABS film, PO film, and PET film.

[0008] In a more optimized manner, the coating thickness of the release agent is 5~200μm; the coating thickness of the hardening liquid is 10~40μm with a light transmittance >90%; the coating thickness of the transparent varnish is 5~15μm with a light transmittance >90%; the thickness of the UV internal texture layer is 8~15μm; the thickness of the coating is 50~300μm, including a high-brightness silver layer; the thickness of the ink layer is 40~60μm; and the coating thickness of the adhesive is 15~30μm.

[0009] More preferably, the curing liquid is composed of the following components by weight: 25-30 parts polyurethane acrylate, 5-7 parts methyl methacrylate-styrene copolymer, 3-4 parts pentaerythritol triacrylate, 5-6 parts ethyl 2-(diethylamino)acrylate, 0.5-1.5 parts 1-hydroxy-cyclohexyl-phenyl ketone, and 75-95 parts propylene glycol monomethyl ether-ethyl acetate composite solvent.

[0010] More preferably, the hardening liquid further includes 5-10 parts of thermochromic antibacterial material; the preparation method of the thermochromic antibacterial material is as follows: Step 1: (1) Add phenol, sodium carbonate and sodium hydroxide to water and stir evenly to obtain raw material A; (2) Add 4-ethyleneaniline to hydrochloric acid-water solution, add sodium nitrite water solution at 0~5℃ and stir for 3~4 hours; slowly add raw material A, react at room temperature for 4~5 hours, adjust pH=5~7 with hydrochloric acid, filter, wash and purify, and dry to obtain diazoxidephenol; Step 2: Mix ethyl 2-(diethylamino)acrylate with epoxybromopropane, slowly add it to acetonitrile, set the temperature to 45~55℃, stir and react for 5~7 hours, dry after rotary evaporation to obtain epoxy quaternary ammonium salt; Step 3: Under a nitrogen atmosphere, diazoxide phenol is added to the solvent DMSO and stirred until homogeneous. Then, epoxy quaternary ammonium salt and tetrabutylammonium bromide are added. The mixture is stirred and reacted at 50-80°C for 12-24 hours. After filtration, washing, and drying, the thermochromic antibacterial material is obtained.

[0011] In a more optimized manner, the mass ratio of phenol, sodium carbonate, and sodium hydroxide in raw material A is (1~2):(1.5~2.5):(0.5~1.5); the mass ratio of hydrochloric acid and deionized water in the hydrochloric acid-water solution is 5:(10~15); and the mass ratio of sodium nitrite and deionized water in the sodium nitrite-water solution is (1~3):(5~10). The raw materials for the diazoxide phenol, by weight, are: 1-3 parts 4-vinylaniline, 15-20 parts hydrochloric acid-water solution, 6-13 parts sodium nitrite-water solution, and 3-6 parts raw material A; In the raw materials of the epoxy quaternary ammonium salt, the mass ratio of ethyl 2-(diethylamino)acrylate to epoxy propane is (5.2~8.2):(5~8). The raw materials of the thermochromic antibacterial material, by weight, are: 1-1.2 parts diazoxide phenol, 1.5-2 parts epoxy quaternary ammonium salt, and 0.5-1 parts tetrabutylammonium bromide.

[0012] In a more optimized manner, the molar ratio of methyl methacrylate to styrene in the raw materials of the methyl methacrylate-styrene copolymer is (0.55~0.70):(0.30~0.45).

[0013] In a more optimized manner, the mass ratio of propylene glycol monomethyl ether to ethyl acetate in the raw materials of the propylene glycol monomethyl ether-ethyl acetate composite solvent is 1:(0.2~0.8).

[0014] Ideally, the material of the mobile phone frame workpiece includes one of plastic, fiberglass, and metal.

[0015] A manufacturing process for a textured mobile phone frame results in a textured mobile phone frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention applies 3D vacuum bonding technology and textured film to the appearance decoration of mobile phone mid-frame structural components, giving the mid-frame a colorful textured effect with many texture variations and strong texture and color effects, suitable for different user needs. The surface texture effect of the mid-frame can be selected according to user needs, which can better meet consumer needs. In addition, this process does not use traditional spraying process, avoiding VOC emissions and making the manufacturing process more environmentally friendly.

[0017] 2. The textured mobile phone frame prepared by this invention possesses thermochromic and antibacterial properties. By adding thermochromic antibacterial materials to the curing solution formula, the high vibrancy and antibacterial properties of the mobile phone frame are improved while maximizing light transmittance. Due to poor compatibility among raw material formulations, the following measures are taken to improve compatibility: Firstly, the 4-ethyleneaniline in the diazoxide-containing raw material contains an alkenyl group, and secondly, the 2-(diethylamino)acrylate in the epoxy quaternary ammonium salt raw material also contains an alkenyl group. These two components exhibit reactive compatibility, thus improving the compatibility of the thermochromic antibacterial material in the curing solution. Additionally, the curing solution contains 2-(diethylamino)acrylate monomers with similar chain segments to the thermochromic antibacterial material, promoting… By achieving similar compatibility, the dispersion and cross-linking of the thermochromic antibacterial material in the hardening liquid are ensured, and the reduction in light transmittance can be effectively controlled, ensuring a transparency of >85% and forming a transparent yellow color. Due to the presence of diazoxide phenyl groups, it can change from transparent yellow to transparent red under ultraviolet irradiation in conjunction with the reflection of a high-brightness silver layer, thus improving the color performance of the phone frame. At the same time, the quaternary ammonium salt molecules in the epoxy quaternary ammonium salt contain positively charged nitrogen atoms, which can destroy bacterial cell membranes through positive charge adsorption, achieving an antibacterial effect and giving the phone frame contact antibacterial capability. The thermochromic antibacterial material formed by the stable combination of the two allows the prepared phone frame to meet both users' health needs and their pursuit of personalized appearance. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that the following quantities are by weight. There are no special restrictions on the manufacturers of the raw materials involved in this invention. Exemplary examples include: release agent (TD-6575-XX high tensile release agent), transparent varnish (PET-XX high tensile varnish; provided by Huizhou Yundian New Material Technology Co., Ltd.), cover ink (PET-XX high tensile ink; provided by Huizhou Yundian New Material Technology Co., Ltd.), adhesive (3M-XX epoxy thermosetting adhesive; provided by 3M China Co., Ltd.). All other related raw materials without special description are commercially available.

[0020] Example 1: A manufacturing process for a mobile phone mid-frame with a textured effect, the specific steps of which are as follows: I. Preparation of Temperature-Changing Antibacterial Materials Step 1: (1) Add 1 part phenol, 1.5 parts sodium carbonate and 0.5 parts sodium hydroxide to water and stir evenly to obtain raw material A; (2) Add 1 part 4-ethyleneaniline to 15 parts hydrochloric acid-water solution (5 parts hydrochloric acid and 10 parts deionized water), add 6 parts sodium nitrite water solution (1 part sodium nitrite and 5 parts deionized water) at 3°C, stir for 3 hours; slowly add 3 parts raw material A, react at room temperature for 4 hours, adjust pH=5 with hydrochloric acid, filter, wash and purify, and dry to obtain diazoxidephenol; Step 2: Mix 5.2 parts of ethyl 2-(diethylamino)acrylate with 5 parts of epoxybromopropane, slowly add the mixture to acetonitrile, set the temperature to 45℃, stir and react for 5 hours, and then dry after rotary evaporation to obtain epoxy quaternary ammonium salt. Step 3: Under a nitrogen atmosphere, add 1 part diazoxide phenol to the solvent DMSO, stir until homogeneous, add 1.5 parts epoxy quaternary ammonium salt and 0.5 parts tetrabutylammonium bromide, stir and react at 50°C for 12 hours, filter, wash and dry to obtain the thermochromic antibacterial material.

[0021] II. Preparation of the curing solution: 25 parts of polyurethane acrylate, 5 parts of methyl methacrylate-styrene copolymer (the molar ratio of methyl methacrylate to styrene is 0.55:0.30), 3 parts of pentaerythritol triacrylate, 5 parts of ethyl 2-(diethylamino)acrylate, 0.5 parts of 1-hydroxy-cyclohexyl-phenyl ketone, and 5 parts of thermochromic antibacterial material were sequentially added to 75 parts of propylene glycol monomethyl ether-ethyl acetate composite solvent (the mass ratio of propylene glycol monomethyl ether to ethyl acetate is 1:0.2), and stirred evenly to obtain the curing solution.

[0022] III. Preparation of a Mobile Phone Frame with Textured Effect Step 1: Transfer a release agent with an external texture effect onto the PET base film to form a release film; then apply a hardening liquid to its surface, cure and dry to form a hardened layer; Step 2: Screen print transparent varnish on the hardened layer in Step 1 to form a varnish layer; then sequentially transfer a UV inner texture layer, electroplat to form a coating layer, screen print a base ink layer, and dry to obtain a textured material; Step 3: Apply adhesive to the base ink layer of the textured material and attach the glass fiber mobile phone frame to it; remove the base film and release film to obtain a mobile phone frame with a textured effect.

[0023] In this embodiment, the coating thickness of the release agent is 5 μm, the coating thickness of the hardening liquid is 10 μm, the coating thickness of the transparent varnish is 5 μm, the thickness of the UV inner texture layer is 8 μm, the thickness of the coating layer is 50 μm, the thickness of the cover ink layer is 40 μm, and the coating thickness of the adhesive is 15 μm.

[0024] Example 2: A manufacturing process for a mobile phone mid-frame with a textured effect, the specific steps of which are as follows: I. Preparation of Temperature-Changing Antibacterial Materials Step 1: (1) Add 1.5 parts phenol, 2 parts sodium carbonate and 1 part sodium hydroxide to water and stir evenly to obtain raw material A; (2) Add 2 parts 4-ethyleneaniline to 17 parts hydrochloric acid-water solution (5 parts hydrochloric acid and 12 parts deionized water), add 10 parts sodium nitrite water solution (2 parts sodium nitrite and 8 parts deionized water) at 3°C, stir for 3.5 hours; slowly add 4.5 parts raw material A, react at room temperature for 4.5 hours, adjust pH=6 with hydrochloric acid, filter, wash and purify, dry to obtain diazoxidephenol; Step 2: Mix 6.5 parts of ethyl 2-(diethylamino)acrylate with 6.5 parts of epoxypropane, slowly add the mixture to acetonitrile, set the temperature to 50℃, stir and react for 6 hours, and then dry by rotary evaporation to obtain epoxy quaternary ammonium salt; Step 3: Under a nitrogen atmosphere, add 1.5 parts of diazoxide phenol to the solvent DMSO, stir until homogeneous, add 2 parts of epoxy quaternary ammonium salt and 0.7 parts of tetrabutylammonium bromide, stir and react at 65°C for 18 hours, filter, wash and dry to obtain the thermochromic antibacterial material.

[0025] II. Preparation of the curing solution: 27 parts of polyurethane acrylate, 6 parts of methyl methacrylate-styrene copolymer (molar ratio of methyl methacrylate to styrene is 0.6:0.35), 3.5 parts of pentaerythritol triacrylate, 5.5 parts of ethyl 2-(diethylamino)acrylate, 1 part of 1-hydroxy-cyclohexyl-phenyl ketone, and 10 parts of thermochromic antibacterial material were added sequentially to 85 parts of propylene glycol monomethyl ether-ethyl acetate composite solvent (mass ratio of propylene glycol monomethyl ether to ethyl acetate is 1:0.5), and stirred evenly to obtain the curing solution.

[0026] III. Preparation of a Mobile Phone Frame with Textured Effect Step 1: Transfer a release agent with an external texture effect onto the PET base film to form a release film; then apply a hardening liquid to its surface, cure and dry to form a hardened layer; Step 2: Screen print transparent varnish on the hardened layer in Step 1 to form a varnish layer; then sequentially transfer a UV inner texture layer, electroplat to form a coating layer, screen print a base ink layer, and dry to obtain a textured material; Step 3: Apply adhesive to the base ink layer of the textured material and attach the glass fiber mobile phone frame to it; remove the base film and release film to obtain a mobile phone frame with a textured effect.

[0027] In this embodiment, the coating thickness of the release agent is 20 μm, the coating thickness of the hardening liquid is 15 μm, the coating thickness of the transparent varnish is 10 μm, the thickness of the UV inner texture layer is 10 μm, the thickness of the coating layer is 70 μm, the thickness of the cover ink layer is 50 μm, and the coating thickness of the adhesive is 20 μm.

[0028] Example 3: A manufacturing process for a mobile phone mid-frame with a textured effect, the specific steps of which are as follows: I. Preparation of Temperature-Changing Antibacterial Materials Step 1: (1) Add 2 parts phenol, 2.5 parts sodium carbonate and 1.5 parts sodium hydroxide to water and stir evenly to obtain raw material A; (2) Add 3 parts 4-ethyleneaniline to 20 parts hydrochloric acid-water solution (5 parts hydrochloric acid and 15 parts deionized water), add 13 parts sodium nitrite water solution (3 parts sodium nitrite and 10 parts deionized water) at 3°C, stir for 4 hours; slowly add 6 parts raw material A, react at room temperature for 5 hours, adjust pH=7 with hydrochloric acid, filter, wash and purify, and dry to obtain diazoxidephenol; Step 2: Mix 8.2 parts of ethyl 2-(diethylamino)acrylate with 8 parts of epoxy propane, slowly add the mixture to acetonitrile, set the temperature to 55℃, stir and react for 7 hours, and then dry after rotary evaporation to obtain epoxy quaternary ammonium salt; Step 3: Under a nitrogen atmosphere, add 2 parts of diazoxide phenol to the solvent DMSO, stir until homogeneous, add 3 parts of epoxy quaternary ammonium salt and 1 part of tetrabutylammonium bromide, stir and react at 80°C for 24 hours, filter, wash and dry to obtain the thermochromic antibacterial material.

[0029] II. Preparation of the curing solution: 30 parts of polyurethane acrylate, 7 parts of methyl methacrylate-styrene copolymer (molar ratio of methyl methacrylate to styrene is 0.70:0.45), 4 parts of pentaerythritol triacrylate, 6 parts of 2-(diethylamino)acrylate, 1.5 parts of 1-hydroxy-cyclohexyl-phenyl ketone, and 15 parts of thermochromic antibacterial material were added sequentially to 95 parts of propylene glycol monomethyl ether-ethyl acetate composite solvent (mass ratio of propylene glycol monomethyl ether to ethyl acetate is 1:0.8), and stirred evenly to obtain the curing solution.

[0030] III. Preparation of a Mobile Phone Frame with Textured Effect Step 1: Transfer a release agent with an external texture effect onto the PET base film to form a release film; then apply a hardening liquid to its surface, cure and dry to form a hardened layer; Step 2: Screen print transparent varnish on the hardened layer in Step 1 to form a varnish layer; then sequentially transfer a UV inner texture layer, electroplat to form a coating layer, screen print a base ink layer, and dry to obtain a textured material; Step 3: Apply adhesive to the base ink layer of the textured material and attach the glass fiber mobile phone frame to it; remove the base film and release film to obtain a mobile phone frame with a textured effect.

[0031] In this embodiment, the coating thickness of the release agent is 30 μm, the coating thickness of the hardening liquid is 25 μm, the coating thickness of the transparent varnish is 15 μm, the thickness of the UV inner texture layer is 15 μm, the thickness of the coating layer is 100 μm, the thickness of the cover ink layer is 60 μm, and the coating thickness of the adhesive is 30 μm.

[0032] Comparative Example 1: Referring to Example 2, the composition of the thermochromic antibacterial material was adjusted by using phenol instead of diazoxide phenol. The specific steps are as follows: I. Preparation of Temperature-Changing Antibacterial Materials Step 1: Mix 6.5 parts of ethyl 2-(diethylamino)acrylate with 6.5 parts of epoxybromopropane, slowly add the mixture to acetonitrile, set the temperature to 50℃, stir and react for 6 hours, and then dry after rotary evaporation to obtain epoxy quaternary ammonium salt. Step 2: Under a nitrogen atmosphere, add 1.5 parts of phenol to the solvent DMSO, stir until homogeneous, add 2 parts of epoxy quaternary ammonium salt and 0.7 parts of tetrabutylammonium bromide, stir and react at 65°C for 18 hours, filter, wash and dry to obtain the thermochromic antibacterial material.

[0033] II. Preparation of the curing solution: 27 parts of polyurethane acrylate, 6 parts of methyl methacrylate-styrene copolymer (molar ratio of methyl methacrylate to styrene is 0.6:0.35), 3.5 parts of pentaerythritol triacrylate, 5.5 parts of ethyl 2-(diethylamino)acrylate, 1 part of 1-hydroxy-cyclohexyl-phenyl ketone, and 10 parts of thermochromic antibacterial material were added sequentially to 85 parts of propylene glycol monomethyl ether-ethyl acetate composite solvent (mass ratio of propylene glycol monomethyl ether to ethyl acetate is 1:0.5), and stirred evenly to obtain the curing solution.

[0034] III. Preparation of a Mobile Phone Frame with Textured Effect Step 1: Transfer a release agent with an external texture effect onto the PET base film to form a release film; then apply a hardening liquid to its surface, cure and dry to form a hardened layer; Step 2: Screen print transparent varnish on the hardened layer in Step 1 to form a varnish layer; then sequentially transfer a UV inner texture layer, electroplat to form a coating layer, screen print a base ink layer, and dry to obtain a textured material; Step 3: Apply adhesive to the base ink layer of the textured material and attach the glass fiber mobile phone frame to it; remove the base film and release film to obtain a mobile phone frame with a textured effect.

[0035] In this embodiment, the coating thickness of the release agent is 20 μm, the coating thickness of the hardening liquid is 15 μm, the coating thickness of the transparent varnish is 10 μm, the thickness of the UV inner texture layer is 10 μm, the thickness of the coating layer is 70 μm, the thickness of the cover ink layer is 50 μm, and the coating thickness of the adhesive is 20 μm.

[0036] Comparative Example 2: Referring to Example 2, the temperature-sensitive antibacterial material was adjusted without adding epoxy quaternary ammonium salts. The specific steps are as follows: I. Preparation of Temperature-Changing Antibacterial Materials Step 1: (1) Add 1.5 parts phenol, 2 parts sodium carbonate and 1 part sodium hydroxide to water and stir evenly to obtain raw material A; (2) Add 2 parts 4-ethylene aniline to 17 parts hydrochloric acid-water solution (5 parts hydrochloric acid and 12 parts deionized water), add 10 parts sodium nitrite water solution (2 parts sodium nitrite and 8 parts deionized water) at 3°C, stir for 3.5 hours; slowly add 4.5 parts raw material A, react at room temperature for 4.5 hours, adjust pH=6 with hydrochloric acid, filter, wash and purify, dry to obtain temperature-sensitive antibacterial material.

[0037] II. Preparation of the curing solution: 27 parts of polyurethane acrylate, 6 parts of methyl methacrylate-styrene copolymer (molar ratio of methyl methacrylate to styrene is 0.6:0.35), 3.5 parts of pentaerythritol triacrylate, 5.5 parts of ethyl 2-(diethylamino)acrylate, 1 part of 1-hydroxy-cyclohexyl-phenyl ketone, and 10 parts of thermochromic antibacterial material were added sequentially to 85 parts of propylene glycol monomethyl ether-ethyl acetate composite solvent (mass ratio of propylene glycol monomethyl ether to ethyl acetate is 1:0.5), and stirred evenly to obtain the curing solution.

[0038] III. Preparation of a Mobile Phone Frame with Textured Effect Step 1: Transfer a release agent with an external texture effect onto the PET base film to form a release film; then apply a hardening liquid to its surface, cure and dry to form a hardened layer; Step 2: Screen print transparent varnish on the hardened layer in Step 1 to form a varnish layer; then sequentially transfer a UV inner texture layer, electroplat to form a coating layer, screen print a base ink layer, and dry to obtain a textured material; Step 3: Apply adhesive to the base ink layer of the textured material and attach the glass fiber mobile phone frame to it; remove the base film and release film to obtain a mobile phone frame with a textured effect.

[0039] In this embodiment, the coating thickness of the release agent is 20 μm, the coating thickness of the hardening liquid is 15 μm, the coating thickness of the transparent varnish is 10 μm, the thickness of the UV inner texture layer is 10 μm, the thickness of the coating layer is 70 μm, the thickness of the cover ink layer is 50 μm, and the coating thickness of the adhesive is 20 μm.

[0040] Comparative Example 3: Referring to Example 2, the thermochromic antibacterial material was adjusted, and the addition ratio of diazoxide phenol to epoxy quaternary ammonium salt was 3:1. The specific steps are as follows: I. Preparation of Temperature-Changing Antibacterial Materials Step 1: (1) Add 1.5 parts phenol, 2 parts sodium carbonate and 1 part sodium hydroxide to water and stir evenly to obtain raw material A; (2) Add 2 parts 4-ethyleneaniline to 17 parts hydrochloric acid-water solution (5 parts hydrochloric acid and 12 parts deionized water), add 10 parts sodium nitrite water solution (2 parts sodium nitrite and 8 parts deionized water) at 3°C, stir for 3.5 hours; slowly add 4.5 parts raw material A, react at room temperature for 4.5 hours, adjust pH=6 with hydrochloric acid, filter, wash and purify, dry to obtain diazoxidephenol; Step 2: Mix 6.5 parts of ethyl 2-(diethylamino)acrylate with 6.5 parts of epoxypropane, slowly add the mixture to acetonitrile, set the temperature to 50℃, stir and react for 6 hours, and then dry by rotary evaporation to obtain epoxy quaternary ammonium salt; Step 3: Under a nitrogen atmosphere, add 3 parts of diazoxide phenol to the solvent DMSO, stir until homogeneous, add 1 part of epoxy quaternary ammonium salt and 0.7 parts of tetrabutylammonium bromide, stir and react at 65°C for 18 hours, filter, wash and dry to obtain the thermochromic antibacterial material.

[0041] II. Preparation of the curing solution: 27 parts of polyurethane acrylate, 6 parts of methyl methacrylate-styrene copolymer (molar ratio of methyl methacrylate to styrene is 0.6:0.35), 3.5 parts of pentaerythritol triacrylate, 5.5 parts of ethyl 2-(diethylamino)acrylate, 1 part of 1-hydroxy-cyclohexyl-phenyl ketone, and 10 parts of thermochromic antibacterial material were added sequentially to 85 parts of propylene glycol monomethyl ether-ethyl acetate composite solvent (mass ratio of propylene glycol monomethyl ether to ethyl acetate is 1:0.5), and stirred evenly to obtain the curing solution.

[0042] III. Preparation of a Mobile Phone Frame with Textured Effect Step 1: Transfer a release agent with an external texture effect onto the PET base film to form a release film; then apply a hardening liquid to its surface, cure and dry to form a hardened layer; Step 2: Screen print transparent varnish on the hardened layer in Step 1 to form a varnish layer; then sequentially transfer a UV inner texture layer, electroplat to form a coating layer, screen print a base ink layer, and dry to obtain a textured material; Step 3: Apply adhesive to the base ink layer of the textured material and attach the glass fiber mobile phone frame to it; remove the base film and release film to obtain a mobile phone frame with a textured effect.

[0043] In this embodiment, the coating thickness of the release agent is 20 μm, the coating thickness of the hardening liquid is 15 μm, the coating thickness of the transparent varnish is 10 μm, the thickness of the UV inner texture layer is 10 μm, the thickness of the coating layer is 70 μm, the thickness of the cover ink layer is 50 μm, and the coating thickness of the adhesive is 20 μm.

[0044] Comparative Example 4: Referring to Example 2, without adding thermochromic antibacterial materials, the specific steps are as follows: I. Preparation of the curing solution: 25-30 parts of polyurethane acrylate, 5-7 parts of methyl methacrylate-styrene copolymer (molar ratio of methyl methacrylate to styrene is (0.55-0.70):(0.30-0.45)), 3-4 parts of pentaerythritol triacrylate, 5-6 parts of ethyl 2-(diethylamino)acrylate, and 0.5-1.5 parts of 1-hydroxy-cyclohexyl-phenyl ketone are added sequentially to 75-95 parts of propylene glycol monomethyl ether-ethyl acetate composite solvent (mass ratio of propylene glycol monomethyl ether to ethyl acetate is 1:(0.2-0.8)), and stirred evenly to obtain the curing solution.

[0045] III. Preparation of a Mobile Phone Frame with Textured Effect Step 1: Transfer a release agent with an external texture effect onto the PET base film to form a release film; then apply a hardening liquid to its surface, cure and dry to form a hardened layer; Step 2: Screen print transparent varnish on the hardened layer in Step 1 to form a varnish layer; then sequentially transfer a UV inner texture layer, electroplat to form a coating layer, screen print a base ink layer, and dry to obtain a textured material; Step 3: Apply adhesive to the base ink layer of the textured material and attach the glass fiber mobile phone frame to it; remove the base film and release film to obtain a mobile phone frame with a textured effect.

[0046] In this embodiment, the coating thickness of the release agent is 20 μm, the coating thickness of the hardening liquid is 15 μm, the coating thickness of the transparent varnish is 10 μm, the thickness of the UV inner texture layer is 10 μm, the thickness of the coating layer is 70 μm, the thickness of the cover ink layer is 50 μm, and the coating thickness of the adhesive is 20 μm.

[0047] Performance testing: Using a spectrophotometer, the temperature was increased within the range of -20℃ to 50℃ (rate 5℃ / min), and the color coordinate changes were recorded to calculate the color difference ΔE value; Staphylococcus aureus and Escherichia coli were inoculated on the surface of the middle frame according to the dynamic contact method in ISO 22196:2011 "Determination of antimicrobial activity of plastics and other non-porous surfaces" and ASTM E2149, and the viable bacteria count was detected after 24 hours to calculate the antimicrobial rate; The light transmittance of the mobile phone middle frame was tested according to GB / T 2410-2008 "Test methods for light transmittance and haze of transparent plastics".

[0048] Conclusion: Comparing the data from Examples 1-3, all examples exhibited excellent thermochromic color difference effects by adjusting the composition ratio and process parameters of the thermochromic antibacterial material. Among them, Example 2 showed the best overall performance. With the adjustment of the ratio of diazoxide phenol and epoxy quaternary ammonium salt in the thermochromic antibacterial material, the molecular structure stability and compatibility with the system were enhanced, thereby effectively improving the color change response and antibacterial activity. The resulting mobile phone frame changed color from transparent yellow to transparent red under ultraviolet light irradiation, with a color difference ΔE > 3, showing a clear color change and thus giving the mobile phone frame a dazzling effect.

[0049] Comparing the data from Example 2 and Comparative Examples 1-4, it can be seen that directly replacing diazoxide with phenol destroys the chromophore group in the diazoxide structure, resulting in a lack of effective covalent bonding in the thermochromic antibacterial material. The absence of chromophore groups leads to loss of thermochromic response, uneven dispersion of antibacterial components, a significant reduction in color difference ΔE, and a decline in antibacterial performance. The absence of epoxy quaternary ammonium salt results in the loss of its antibacterial effect, significantly degrading antibacterial performance. Although the color-changing effect is less affected, the overall function is compromised. Adjusting the ratio of diazoxide to epoxy quaternary ammonium salt to 3:1 results in an excess of diazoxide, causing an imbalance in the bonding between chromophore and antibacterial groups in the material. This weakens the synergistic effect of thermochromic response and antibacterial components, leading to a decline in performance. Completely omitting thermochromic antibacterial material renders the curing liquid devoid of its thermosensitive and antibacterial functions, thus significantly reducing both thermochromic effect and antibacterial performance. In conclusion, the effective addition of thermochromic antibacterial material to the curing liquid enables the mobile phone frame to possess excellent thermochromic color difference effects and antibacterial performance, meeting the personalized needs of consumers.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A manufacturing process of a mobile phone middle frame with texture effect, characterized in that: The method comprises the following steps: Step 1: transferring a release agent with an outer texture effect on a base film to form a release film; Then a hardening liquid is coated on the surface, and is cured and dried to form a hardening layer; Step 2: silk printing transparent varnish on the hardening layer of step 1 to form a varnish layer; then transferring a UV inner texture layer on the surface, electroplating to form a plating layer, and silk printing a cover ink layer, and drying to obtain a texture effect material; Step 3: coating an adhesive on the cover ink layer of the texture effect material, and adhering the mobile phone middle frame workpiece thereto; tearing off the base film and the release film to obtain a mobile phone middle frame with a texture effect.

2. The manufacturing process of a mobile phone middle frame with texture effect according to claim 1, characterized in that: The base film is a high-stretching medium film, and is one of ABS film, PO film and PET film.

3. The manufacturing process of a mobile phone middle frame with texture effect according to claim 1, characterized in that: The coating thickness of the release agent is 5-200 microns; the coating thickness of the hardening liquid is 10-40 microns, and the light transmittance is greater than 90%; the coating thickness of the transparent varnish is 5-15 microns, and the light transmittance is greater than 90%; the thickness of the UV inner texture layer is 8-15 microns; the thickness of the plating layer is 50-300 microns, and the plating layer comprises a high-brightness silver layer; the thickness of the ink layer is 40-60 microns; and the coating thickness of the adhesive is 15-30 microns.

4. The manufacturing process of a mobile phone middle frame with texture effect according to claim 1, characterized in that: The hardening liquid is composed of the following components by weight: 25-30 parts of polyurethane acrylate, 5-7 parts of methyl methacrylate-styrene copolymer, 3-4 parts of pentaerythritol triacrylate, 5-6 parts of 2-(diethylamino)ethyl acrylate, 0.5-1.5 parts of 1-hydroxy-cyclohexyl-phenyl ketone, and 75-95 parts of propylene glycol monomethyl ether-acetic acid ethyl ester composite solvent.

5. The manufacturing process of a mobile phone middle frame with texture effect according to claim 4, characterized in that: The hardening liquid further comprises 5-10 parts of a temperature-variable antibacterial material. The preparation method of the temperature-variable antibacterial material is as follows: Step 1: (1) adding phenol, sodium carbonate and sodium hydroxide into water and stirring to obtain raw material A; (2) adding 4-vinylaniline into a hydrochloric acid-water solution, adding sodium nitrite aqueous solution at a temperature of 0-5 DEG C, stirring for 3-4 hours, slowly adding raw material A, reacting at room temperature for 4-5 hours, adjusting pH to 5-7 with hydrochloric acid, filtering, washing and drying to obtain diazophenol; Step 2: mixing 2-(diethylamino)ethyl acrylate and epoxy bromopropane, slowly adding acetonitrile, setting the temperature to 45-55 DEG C, stirring for 5-7 hours, drying after rotary evaporation to obtain epoxy quaternary ammonium salt; Step 3: adding diazophenol into solvent DMSO under nitrogen atmosphere, stirring to uniform, adding epoxy quaternary ammonium salt and tetrabutylammonium bromide, stirring at 50-80 DEG C for 12-24 hours, filtering, washing and drying to obtain the temperature-variable antibacterial material.

6. The manufacturing process of a mobile phone middle frame with texture effect according to claim 5, characterized in that: In the raw material of the raw material A, the mass ratio of phenol, sodium carbonate and sodium hydroxide is (1-2):(1.5-2.5):(0.5-1.5); in the raw material of the hydrochloric acid-water solution, the mass ratio of hydrochloric acid and deionized water is 5:(10-15); and in the raw material of the sodium nitrite aqueous solution, the mass ratio of sodium nitrite and deionized water is (1-3):(5-10). The raw materials for the diazoxide phenol, by weight, are: 1-3 parts 4-vinylaniline, 15-20 parts hydrochloric acid-water solution, 6-13 parts sodium nitrite-water solution, and 3-6 parts raw material A; In the raw materials of the epoxy quaternary ammonium salt, the mass ratio of ethyl 2-(diethylamino)acrylate to epoxy propane is (5.2~8.2):(5~8). The raw materials of the thermochromic antibacterial material, by weight, are: 1-1.2 parts diazoxide phenol, 1.5-2 parts epoxy quaternary ammonium salt, and 0.5-1 parts tetrabutylammonium bromide.

7. The manufacturing process of a mobile phone middle frame with texture effect according to claim 4, characterized in that: In the raw materials of the methyl methacrylate-styrene copolymer, the molar ratio of methyl methacrylate to styrene is (0.55~0.70):(0.30~0.45).

8. The manufacturing process of a mobile phone middle frame with texture effect according to claim 4, characterized in that: In the raw materials of the propylene glycol monomethyl ether-ethyl acetate composite solvent, the mass ratio of propylene glycol monomethyl ether to ethyl acetate is 1:(0.2~0.8).

9. The manufacturing process of a mobile phone middle frame with texture effect according to claim 1, characterized in that: The material of the mobile phone frame includes one of plastic, fiberglass, and metal.

10. A mobile phone frame with a textured effect obtained by the manufacturing process of a mobile phone frame with a textured effect according to any one of claims 1 to 9.

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