阅读说明：本技术 一种荧光手机背板生产工艺 (Production process of fluorescent mobile phone backboard ) 是由 吴建晓 张伦玉 于 2021-09-09 设计创作，主要内容包括：本发明公开了一种荧光手机背板生产工艺,在平面壳体的外表面印刷荧光油墨层,在所述平面壳体的荧光油墨层上形成镀膜层,在所述平面壳体的内表面和镀膜层上印刷高耐磨光固化油墨层,将平面壳体进行高压成型,将高压成型后的平面壳体加工成指定手机背板的形状。本发明利用稀土配合物在紫外光照射下能产生很强的荧光特性,通过在手机背板上印刷含有稀土配合物的荧光油墨层,背板能够灵敏感应光线的变化,呈现出光感效应,能够使用户体验到不同的视觉效果,满足用户审美要求,提升外观质量。(The invention discloses a production process of a fluorescent mobile phone backboard, which comprises the steps of printing a fluorescent ink layer on the outer surface of a plane shell, forming a coating layer on the fluorescent ink layer of the plane shell, printing a high-wear-resistant photocuring ink layer on the inner surface of the plane shell and the coating layer, carrying out high-pressure molding on the plane shell, and processing the plane shell after the high-pressure molding into the shape of a specified mobile phone backboard. According to the invention, by utilizing the characteristic that the rare earth complex can generate strong fluorescence under the irradiation of ultraviolet light, the fluorescent ink layer containing the rare earth complex is printed on the mobile phone back plate, so that the back plate can sensitively sense the change of light, a light sensation effect is presented, a user can experience different visual effects, the aesthetic requirements of the user are met, and the appearance quality is improved.)

1. A production process of a fluorescent mobile phone backboard is characterized by comprising the following steps: the method comprises the following steps:

(1) printing a fluorescent ink layer on the outer surface of the plane shell;

(2) forming a coating layer on the fluorescent ink layer of the planar shell;

(3) printing a high-wear-resistance photocuring ink layer on the inner surface of the planar shell and the coating layer;

(4) carrying out high-pressure molding on the processed planar shell;

(5) and processing the plane shell after high-pressure molding into the shape of the specified mobile phone back plate.

2. The fluorescent mobile phone backboard production process according to claim 1, wherein: the method comprises the following steps:

(1) printing a fluorescent ink layer on the outer surface of the planar shell:

coating fluorescent ink on the outer surface of the planar shell by using a screen printing technology, and drying and curing after printing;

the fluorescent ink comprises the following raw materials in parts by weight: 80-100 parts of resin binder, 2.5-5.5 parts of fluorescent powder, 2-10 parts of diluent, 1-3 parts of dispersant, 0.1-1 part of defoaming agent and 1-3 parts of wetting agent;

the mesh number of the screen printing plate printed in the screen printing technology is 250-400 meshes, the hardness of the scraping glue is 70-90A, the curing temperature is 60-80 ℃, the curing time is 20-40 minutes, and the whole thickness of the fluorescent ink layer is 10-15 mu m;

(2) forming a film coating layer on the fluorescent ink layer of the planar shell:

in the shellAfter forming the printed fluorescent ink layer, putting the fluorescent ink layer into a vacuum coating machine, and electroplating a high-refractive-index material TiO on the fluorescent ink layer₂The temperature of the film layer in a vacuum coating machine furnace is 40-60 ℃;

(3) printing a high-wear-resistance photocuring ink layer on the inner surface of the planar shell and the coating layer:

coating a high-wear-resistance photocuring ink layer on the inner surface of the planar shell and the coating layer by utilizing a screen printing technology, and performing ultraviolet lamp irradiation curing after printing; the high-wear-resistance photo-curing ink comprises the following raw materials in parts by weight: 55-80 parts of photosensitive resin, 10-15 parts of diluent, 4-6 parts of photoinitiator, 5-10 parts of nano silicon dioxide and 0.1-3 parts of auxiliary agent;

(4) and (3) carrying out high-pressure molding on the processed planar shell:

forming a semi-finished product of the planar shell in a mould by subjecting the planar shell processed in the step to high heat and high pressure in a high-temperature high-pressure forming machine;

(5) processing the planar shell after high-pressure forming into the shape of an appointed mobile phone back plate:

and cutting the molded semi-finished product of the planar shell through a CNC (computerized numerical control) machine tool to form the shape of the specified mobile phone back plate.

3. The fluorescent mobile phone backboard production process according to claim 1 or 2, wherein: the plane shell is made of composite plates, the inner surface of the plane shell is made of polycarbonate, and the outer surface of the plane shell is made of polymethacrylate.

4. The fluorescent mobile phone backboard production process according to claim 2, wherein: the preparation method of the fluorescent ink comprises the following steps: mixing and stirring the resin binder and the diluent uniformly, adding the fluorescent powder and the dispersant, stirring until the mixture is uniformly mixed, adding the defoaming agent and the wetting agent, and stirring until the mixture is uniform to obtain the fluorescent ink; the resin binder is one or more of polyamide resin, epoxy resin and acrylic resin.

5. The fluorescent mobile phone backboard production process according to claim 4, wherein: the preparation method of the fluorescent powder material comprises the following steps: mixing 3-5 parts by weight of rare earth salt, 5-10 parts by weight of ligand and 8-12 parts by weight of alkali, adding the mixture into 30-60 parts by weight of solvent, stirring for 30-60min at the temperature of 30-60 ℃, filtering, drying and grinding to obtain the fluorescent powder.

6. The fluorescent mobile phone backboard production process of claim 5, wherein:

the rare earth salt is one or more of rare earth europium nitrate salt, rare earth terbium chloride salt and rare earth europium chloride salt;

the ligand is beta-diketone or organic carboxylic acid containing aromatic rings;

the alkali is sodium hydroxide or potassium hydroxide;

the solvent is ethanol or distilled water.

7. The fluorescent mobile phone backboard production process according to claim 2, wherein: the high refractive index material TiO₂The preparation process parameters of the thin film layer are as follows: the degree of vacuum was 5.0X 10^-4-1.0×10^-3Pa, working pressure of 0.2-0.4Pa, argon flow of 90-110sccm, oxygen flow of 70-90sccm, evaporation power of 4-7KW, and depositing the obtained high-refractive-index material TiO₂The overall thickness of the thin film layer is 20-30 nm.

8. The fluorescent mobile phone backboard production process according to claim 2, wherein: in the step (3): the mesh number of the screen printing plate printed in the screen printing technology is 300-400 meshes, the hardness of the scraping glue is 70-90A, and the screen printing plate is 1000mj/cm through 600 meshes²And (4) curing by ultraviolet lamp irradiation for 30-90 s, wherein the whole thickness of the printed high-wear-resistance photocuring ink layer is 10-15 microns.

Technical Field

The invention relates to the technical field of surface processing of shells, in particular to a production process of a fluorescent mobile phone backboard.

Background

With the development of science and technology, mobile terminals such as mobile phones and tablet computers have higher and higher utilization rate in various aspects such as work, study and daily communication of people. The mobile phone is a 3C product which is used by people at present, and occupies a mainstream position in the market.

The mobile phone is used as a product with higher use frequency, and the requirement of users on the mobile phone product is higher and higher. In addition to the high requirements for hardware of mobile phone products, users are paying more and more attention to the appearance of mobile phone products. The appearance of the mobile phone product can bring direct visual experience to users, and the quality evaluation of the products by the users is determined to a great extent. The surface quality of the shell of the mobile phone product directly determines the appearance quality of the product. In order to further improve the appearance quality of products and meet higher and higher aesthetic requirements of users, the invention provides a production process of a fluorescent mobile phone backboard.

Disclosure of Invention

The invention aims to provide a production process of a fluorescent mobile phone backboard, which can enable the mobile phone backboard to have rich colors, improve the visual experience of the mobile phone backboard, meet the aesthetic requirements of users and improve the appearance quality.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a production process of a fluorescent mobile phone backboard comprises the following steps:

(1) printing a fluorescent ink layer on the outer surface of the plane shell;

(2) forming a coating layer on the fluorescent ink layer of the planar shell;

(3) printing a high-wear-resistance photocuring ink layer on the inner surface of the planar shell and the coating layer;

(4) carrying out high-pressure molding on the processed planar shell;

(5) and processing the plane shell after high-pressure molding into the shape of the specified mobile phone back plate.

Further, the production process of the fluorescent mobile phone backboard comprises the following steps:

(1) printing a fluorescent ink layer on the outer surface of the planar shell:

coating fluorescent ink on the outer surface of the planar shell and the surface of the fluorescent ink by using a screen printing technology, and drying and curing after printing;

the fluorescent ink comprises the following raw materials in parts by weight: 80-100 parts of resin binder, 2.5-5.5 parts of fluorescent powder, 2-10 parts of diluent, 1-3 parts of dispersant, 0.1-1 part of defoaming agent and 1-3 parts of wetting agent;

the mesh number of the screen printing plate printed in the screen printing technology is 250-400 meshes, the hardness of the scraping glue is 70-90A, the curing temperature is 60-80 ℃, the curing time is 20-40 minutes, and the whole thickness of the fluorescent ink layer is 10-15 mu m;

(2) forming a film coating layer on the fluorescent ink layer of the planar shell:

after printing the fluorescent ink layer on the shell, putting the shell into a vacuum coating machine, and electroplating a high-refractive-index material TiO on the fluorescent ink layer₂The temperature of the film layer in a vacuum coating machine furnace is 40-60 ℃;

(3) printing a high-wear-resistance photocuring ink layer on the inner surface of the planar shell and the coating layer:

coating a high-wear-resistance photocuring ink layer on the inner surface of the planar shell and the coating layer by utilizing a screen printing technology, and performing ultraviolet lamp irradiation curing after printing; the high-wear-resistance photo-curing ink comprises the following raw materials in parts by weight: 55-80 parts of photosensitive resin, 10-15 parts of diluent, 4-6 parts of photoinitiator, 5-10 parts of nano silicon dioxide and 0.1-3 parts of auxiliary agent;

(4) and (3) carrying out high-pressure molding on the processed planar shell:

forming a semi-finished product of the planar shell in a mould by subjecting the planar shell processed in the step to high heat and high pressure in a high-temperature high-pressure forming machine;

(5) processing the planar shell after high-pressure forming into the shape of an appointed mobile phone back plate:

and cutting the molded semi-finished product of the planar shell through a CNC (computerized numerical control) machine tool to form the shape of the specified mobile phone back plate.

Further, the planar shell is a composite plate, the inner surface of the planar shell is made of polycarbonate, and the outer surface of the planar shell is made of polymethacrylate.

Further, the preparation method of the fluorescent ink comprises the following steps: mixing and stirring the resin binder and the diluent uniformly, adding the fluorescent powder and the dispersant, stirring until the mixture is uniformly mixed, adding the defoaming agent and the wetting agent, and stirring until the mixture is uniform to obtain the fluorescent ink; the resin binder is one or more of polyamide resin, epoxy resin and acrylic resin;

further, the preparation method of the fluorescent powder material comprises the following steps: mixing 3-5 parts by weight of rare earth salt, 5-10 parts by weight of ligand and 8-12 parts by weight of alkali, adding the mixture into 30-60 parts by weight of solvent, stirring for 30-60min at the temperature of 30-60 ℃, filtering, drying and grinding to obtain the fluorescent powder.

Further, the rare earth salt is one or more of rare earth europium nitrate, rare earth terbium chloride and rare earth europium chloride;

the ligand is beta-diketone or organic carboxylic acid containing aromatic rings;

the alkali is sodium hydroxide or potassium hydroxide;

the solvent is ethanol or distilled water.

Further, the high refractive index material TiO₂The preparation process parameters of the thin film layer are as follows: the degree of vacuum was 5.0X 10^-4-1.0×10^-3Pa, working pressure of 0.2-0.4Pa, argon flow of 90-110sccm, oxygen flow of 70-90sccm, evaporation power of 4-7KW, and depositing the obtained high-refractive-index material TiO₂The overall thickness of the thin film layer is 20-30 nm.

Furthermore, the mesh number of the screen printing plate printed in the screen printing technology is 300-400 meshes, the hardness of the scraping glue is 70-90A, and the screen printing plate is 1000mj/cm through 600-400 mj/cm²And (4) curing by ultraviolet lamp irradiation for 30-90 s, wherein the whole thickness of the printed high-wear-resistance photocuring ink layer is 10-15 microns.

The invention has the beneficial effects that: the invention prints a fluorescent ink layer on the outer surface of a plane shell, forms a coating layer on the fluorescent ink layer of the plane shell, prints a high-wear-resistance photocuring ink layer on the inner surface of the plane shell and the coating layer, carries out high-pressure molding on the plane shell, and processes the plane shell after the high-pressure molding into the shape of a specified mobile phone backboard. According to the mobile phone back plate, the fluorescent layer is printed on the mobile phone back plate, the back plate can sensitively sense the change of light, the light sensation effect is presented, a user can experience different visual effects, the aesthetic requirement of the user is met, and the appearance quality is improved.

Detailed Description

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

The reagents or instruments used in the present invention are not indicated by manufacturers, and are all conventional products commercially available.

A production process of a fluorescent mobile phone backboard comprises the following steps:

(1) printing fluorescent ink layer on outer surface of planar shell

The plane shell is made of composite plates, the inner surface of the plane shell is made of Polycarbonate (PC), and the outer surface of the plane shell is made of Polymethacrylate (PMMA). PMMA has good wear resistance but low impact strength, and PC has higher impact strength but poorer wear resistance, so the advantages of PMMA and PC are combined to be beneficial to manufacturing high-performance mobile phone backboard materials. The matching of the PMMA outer layer material and the PC inner layer material enables the back plate to have good wear resistance and toughness, and the back plate is polished, cleaned, polished, dried and the like, so that the parameters of the cleanliness, the roughness and the like of the surface of the base material meet the requirements, and the adhesion of the ink layer is facilitated. The hardness of the finished composite board after surface treatment is further improved, and the wear resistance is also greatly improved.

Before the fluorescent ink layer is printed on the outer surface of the planar shell, a target texture layer can be formed on the outer surface of the planar shell through a UV transfer printing process.

In this example, 3 parts by weight of rare earth europium nitrate, 5 parts by weight of β -diketone, and 8 parts by weight of sodium hydroxide were mixed and added to 30 parts by weight of ethanol, and the mixture was stirred at 30 ℃ for 60 minutes, filtered, dried, and ground to obtain a phosphor powder. Mixing and stirring 80 parts by weight of polyamide resin and 2 parts by weight of diluent uniformly, adding 2.5 parts by weight of fluorescent powder and 1 part by weight of dispersant, stirring until the mixture is uniformly mixed, adding 0.1 part by weight of defoaming agent and 1 part by weight of wetting agent, and stirring until the mixture is uniform to obtain fluorescent ink; coating a fluorescent ink layer on the planar shell by using a screen printing technology, and drying and curing after printing; the screen mesh number of the screen printing plate printed in the screen printing technology is 250 meshes, the hardness of the scraping glue is 90A, the curing temperature is 80 ℃, the curing time is 20 minutes, and the whole thickness of the printed fluorescent ink layer is 15 micrometers.

In another example, 5 parts by weight of a rare earth terbium chloride salt, 10 parts by weight of an aromatic ring-containing organic carboxylic acid, and 12 parts by weight of potassium hydroxide were mixed and added to 60 parts by weight of distilled water, stirred at 60 ℃ for 30min, filtered, dried, and ground to obtain a phosphor powder. Mixing and stirring 100 parts by weight of polyamide resin and 10 parts by weight of diluent uniformly, adding 5.5 parts by weight of fluorescent powder and 3 parts by weight of dispersant, stirring until the mixture is uniformly mixed, adding 1 part by weight of defoaming agent and 3 parts by weight of wetting agent, and stirring until the mixture is uniform to prepare fluorescent ink; coating a fluorescent ink layer on the planar shell by using a screen printing technology, and drying and curing after printing; the screen mesh number of the screen printing plate printed in the screen printing technology is 300 meshes, the hardness of the scraping glue is 80A, the curing temperature is 70 ℃, the curing time is 30 minutes, and the whole thickness of the printed fluorescent ink layer is 10 micrometers. .

In other examples, 4 parts by weight of terbium nitrate and europium chloride, 8 parts by weight of β -diketone, and 10 parts by weight of sodium hydroxide were mixed and added to 40 parts by weight of ethanol, and the mixture was stirred at 40 ℃ for 40 minutes, filtered, dried, and ground to obtain a phosphor powder. Mixing and stirring 90 parts by weight of polyamide resin and 6 parts by weight of diluent uniformly, adding 4 parts by weight of fluorescent powder and 2 parts by weight of dispersant, stirring until the mixture is uniformly mixed, adding 0.5 part by weight of defoaming agent and 2 parts by weight of wetting agent, and stirring until the mixture is uniform to obtain fluorescent ink; coating a fluorescent ink layer on the planar shell by using a screen printing technology, and drying and curing after printing; the screen mesh number of the screen printing plate printed in the screen printing technology is 400 meshes, the hardness of the scraping glue is 70A, the curing temperature is 60 ℃, the curing time is 40 minutes, and the whole thickness of the printed fluorescent ink layer is 10 micrometers.

(2) Forming a coating layer on the fluorescent ink layer of the planar shell

In this embodiment, after printing the fluorescent ink layer on the casing, the casing is placed in a vacuum coater, and a high refractive index material TiO is electroplated on the fluorescent ink layer₂The temperature of the film layer in the vacuum coating machine furnace is 40 ℃. High refractive index material TiO₂The preparation process parameters of the thin film layer are as follows: the degree of vacuum was 5.0X 10^-4Pa, the working pressure is 0.4Pa, the argon flow is 90sccm, the oxygen flow is 70sccm, the evaporation power is 5KW, and the deposited high-refractive-index material TiO is obtained₂The overall thickness of the thin film layer was 20 nm.

In another embodiment, the temperature in the vacuum coating machine furnace is 50 ℃, and the high-refractive index material TiO is₂The preparation process parameters of the thin film layer are as follows: vacuum degree of 8.0X 10^-4Pa, the working pressure is 0.3Pa, the argon flow is 100sccm, the oxygen flow is 80sccm, the evaporation power is 4KW, and the deposited high-refractive-index material TiO is obtained₂The overall thickness of the thin film layer was 30 nm.

In other embodiments, the temperature in the vacuum coater furnace is 60 ℃, and the high-refractive-index material TiO is₂The preparation process parameters of the thin film layer are as follows: vacuum degree of 1.0X 10^-3Pa, the working pressure is 0.2Pa, the argon flow is 110sccm, the oxygen flow is 90sccm, the evaporation power is 7KW, and the deposited high-refractive-index material TiO is obtained₂The overall thickness of the thin film layer was 30 nm.

(3) Printing high-wear-resistance photocureable ink layer on the inner surface and the coating layer of the planar shell

In the embodiment, a high-wear-resistance photocuring ink layer is coated on the inner surface of the planar shell and the coating layer by a screen printing technology in a scraping way, and ultraviolet lamp irradiation curing is carried out after printing; the high-wear-resistance photo-curing ink comprises the following raw materials in parts by weight: 55 parts of photosensitive resin, 10 parts of diluent, 4 parts of photoinitiator, 5 parts of nano silicon dioxide and 0.1 part of auxiliary agent; the screen mesh number of the screen printing plate in the screen printing technology is 300 meshes, the hardness of the scraping glue is 70A, and the screen printing plate passes through 1000mj/cm²The ultraviolet lamp irradiates for 30s for curing, and the whole thickness of the printing high-wear-resistance photocuring ink layer is10μm。

In another embodiment, a high-wear-resistance photocuring ink layer is coated on the inner surface of the planar shell and the coating layer by a screen printing technology in a scraping way, and ultraviolet lamp irradiation curing is carried out after printing; the high-wear-resistance photo-curing ink comprises the following raw materials in parts by weight: 80 parts of photosensitive resin, 15 parts of diluent, 6 parts of photoinitiator, 10 parts of nano silicon dioxide and 3 parts of auxiliary agent; the screen printing plate in the silk-screen printing technology has 350 meshes, the glue scraping hardness is 80A, and the screen printing plate passes through 800mj/cm²And (4) curing by ultraviolet lamp irradiation for 60s, wherein the whole thickness of the printed high-wear-resistance photocuring ink layer is 15 microns.

In other embodiments, a high-wear-resistance photocuring ink layer is coated on the inner surface of the planar shell and the coating layer by a screen printing technology in a scraping way, and ultraviolet lamp irradiation curing is carried out after printing; the high-wear-resistance photo-curing ink comprises the following raw materials in parts by weight: 70 parts of photosensitive resin, 12 parts of diluent, 5 parts of photoinitiator, 8 parts of nano silicon dioxide and 1 part of auxiliary agent; the screen mesh number of the screen printing plate in the screen printing technology is 400 meshes, the hardness of the scraping glue is 90A, and the screen printing plate passes through 600mj/cm²And (3) irradiating the ink layer by an ultraviolet lamp for 90s for curing, wherein the whole thickness of the printed high-wear-resistance photocuring ink layer is 12 microns.

(5) Carrying out high-pressure forming on the processed plane shell

In this embodiment, the planar shell processed in the above steps is subjected to high heat and high pressure in a high-temperature high-pressure forming machine to form a semi-finished planar shell in a mold.

(6) Processing the planar shell after high-pressure forming into the shape of the specified mobile phone backboard

In this embodiment, the molded semi-finished product of the planar housing is cut by a CNC numerical control machine to form the shape of the specified mobile phone back plate.

According to the invention, by utilizing the characteristic that the rare earth complex can generate strong fluorescence under the irradiation of ultraviolet light, the fluorescent ink layer containing the rare earth complex is printed on the mobile phone back plate, so that the back plate can sensitively sense the change of light, a light sensation effect is presented, a user can experience different visual effects, the aesthetic requirements of the user are met, and the appearance quality is improved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.