阅读说明：本技术 一种塑料汽车标牌表面着色工艺 (Surface coloring process for plastic automobile label ) 是由 徐海燕 许自金 徐展波 于 2019-10-29 设计创作，主要内容包括：本发明公开了一种塑料汽车标牌表面着色工艺,涉及汽车饰件技术领域,其技术方案要点是一种塑料汽车标牌表面着色工艺,包括如下步骤：S1、选择注塑成型的透明或半透明汽车标牌基材,并且在基材背面一体成型有图案凹槽；S2、将基材预热后,对预热后的基材的背面进行丝网印刷,使基材背面无图案凹槽的区域涂覆有底色,然后对基材进行烘烤处理,得到底色层；S3、对涂覆有底色的基材背面全区域进行真空镀膜处理,得到金属层；S4、对经S3处理后的基材进行喷涂保护处理即可。本发明通过丝网印刷与真空镀膜加工结合的工艺,使基材正面的指定区域可以呈现出金属质感,简化了工艺流程,提高了生产效率。(The invention discloses a surface coloring process of a plastic automobile label, which relates to the technical field of automobile ornaments, and the technical scheme is characterized in that the surface coloring process of the plastic automobile label comprises the following steps: s1, selecting an injection-molded transparent or semitransparent automobile label substrate, and integrally forming a pattern groove on the back of the substrate; s2, preheating the base material, performing screen printing on the back surface of the preheated base material to coat the background color on the area without the pattern groove on the back surface of the base material, and then baking the base material to obtain a background color layer; s3, performing vacuum coating treatment on the whole area of the back of the base material coated with the ground color to obtain a metal layer; and S4, performing spray protection treatment on the base material treated by the S3. According to the invention, through the process of combining the screen printing and the vacuum coating processing, the specified area on the front surface of the base material can present metal texture, the process flow is simplified, and the production efficiency is improved.)

1. A surface coloring process for a plastic automobile label is characterized by comprising the following steps: the method comprises the following steps:

s1, selecting an injection-molded transparent or semitransparent automobile label substrate, and integrally forming a pattern groove on the back of the substrate;

s2, preheating the base material, performing screen printing on the back surface of the preheated base material to coat the background color on the area without the pattern groove on the back surface of the base material, and then baking the base material to obtain a background color layer;

s3, performing vacuum coating treatment on the whole area of the back of the base material coated with the ground color to obtain a metal layer;

and S4, performing spray protection treatment on the base material treated by the S3.

2. The process for coloring a surface of a plastic automobile emblem of claim 1, wherein: preheating the base material in S2 at 40-50 deg.C for 20-30 min; the baking temperature in S2 is 50-60 ℃, and the baking time is 2-4 h.

3. The process for coloring a surface of a plastic automobile emblem of claim 1, wherein: the thickness of the primer layer in S2 is 10-50 μm.

4. The process for coloring a surface of a plastic automobile emblem of claim 1, wherein: the vacuum coating treatment in S3 specifically includes the following operations: placing the substrate treated by the S2 in a vacuum coating machine, wherein the target is aluminum, and the distance between the target and the substrate is 100-200 mm; vacuum-pumping to 5.0 × 10^-3Pa, introducing argon, and controlling the vacuum degree to be 0.4-0.6 Pa; and plating a metal layer on the whole area of the back of the substrate by adopting magnetron sputtering coating.

5. The process of coloring a surface of a plastic automobile emblem according to claim 4, wherein: the coating current in S3 is 70-80A, the coating time is 1-3min, and the temperature in the furnace is 60-70 ℃.

6. The process for coloring a surface of a plastic automobile emblem of claim 1, wherein: the spray protection in S4 means: spraying color paint on the surface of the base material treated by S3, baking for 3-5min at the temperature of 60-65 ℃, and obtaining a primer layer with the thickness of 20-40 mu m after ultraviolet irradiation with the total absorption energy value of 800 and 1000 mJ/square centimeter; then spraying varnish on the primer layer, and baking for 30-40min at the temperature of 60-70 ℃ to obtain a varnish layer with the thickness of 10-20 mu m.

7. The process of coloring a surface of a plastic automobile emblem of claim 6, wherein: the colored paint is prepared from the following raw materials in parts by weight: 40-50 parts of polyamino acrylate, 20-25 parts of trimethylolpropane triacrylate, 25-30 parts of tripropylene glycol diacrylate, 3-5 parts of isobutyl acetate, 3-5 parts of acetone, 3-5 parts of isobornyl methacrylate, 3-5 parts of isooctyl methacrylate, 1-2 parts of gamma-aminopropyltriethoxysilane and 1-2 parts of 1-hydroxy-cyclohexyl-phenyl ketone.

8. The process of coloring a surface of a plastic automobile emblem of claim 7, wherein: the colored paint is prepared by the following method: 40-50 parts of polyamino acrylate and 20-25 parts of trimethylolpropane triacrylate by weight part, and stirring and dispersing for 10-15 min; then adding 25-30 parts of tripropylene glycol diacrylate, 3-5 parts of isobutyl acetate, 3-5 parts of acetone, 3-5 parts of isobornyl methacrylate, 3-5 parts of isooctyl methacrylate and 1-2 parts of gamma-aminopropyltriethoxysilane, stirring at a high speed for 5-10min, adding 1-2 parts of 1-hydroxy-cyclohexyl-phenyl ketone, and stirring at a high speed for 30-40min to obtain the colored paint.

Technical Field

The invention relates to the technical field of automobile ornaments, in particular to a surface coloring process of a plastic automobile label.

Background

With the development of economy and science and technology, plastic products are more and more widely applied, and plastic materials on the inner decoration and the outer decoration of the automobile occupy a great proportion; in order to improve the aesthetic appearance and decorative effect of these plastic products, the plastic products are usually printed or coated.

Disclosure of Invention

The invention aims to provide a surface coloring process for a plastic automobile label, which can enable a specified area on the front surface of a base material to present metal texture by combining screen printing and vacuum coating processing, simplifies the process flow and improves the production efficiency.

The technical purpose of the invention is realized by the following technical scheme:

a surface coloring process for a plastic automobile label comprises the following steps:

s1, selecting an injection-molded transparent or semitransparent automobile label substrate, and integrally forming a pattern groove on the back of the substrate;

s2, preheating the base material, performing screen printing on the back surface of the preheated base material to coat the background color on the area without the pattern groove on the back surface of the base material, and then baking the base material to obtain a background color layer;

s3, performing vacuum coating treatment on the whole area of the back of the base material coated with the ground color to obtain a metal layer;

and S4, performing spray protection treatment on the base material treated by the S3.

By adopting the technical scheme, after the back surface of the plastic plate is printed, the printing ink can be attached to the area without the pattern groove, when vacuum coating is carried out, one part of metal ions are filled to the pattern groove, the other part of metal ions cover the area without the pattern groove, so that the metal layer can be formed in the whole area of the back surface of the base material, as the area without the pattern groove is coated with the printing ink through screen printing, when the front surface of the base material is observed, the printing ink in the area without the pattern groove can shield the metal layer, at the moment, only the color of the printing ink can be seen in the area, and the metal layer in the area with the pattern groove can penetrate through the transparent or semitransparent base material, so that the front surface of the base material presents metal texture; through the operation, the process flow is greatly simplified, the production efficiency is improved, and the production cost is reduced.

Further, the preheating temperature of the base material in the S2 is 40-50 ℃, and the preheating time is 20-30 min; the baking temperature in S2 is 50-60 ℃, and the baking time is 2-4 h.

By adopting the technical scheme, the base material is subjected to preheating treatment, so that the screen printing is facilitated, and the binding force of the printing ink and the base material is improved.

Further, the thickness of the primer layer in S2 is 10-50 μm.

By adopting the technical scheme, only the area without the pattern groove can form the ground color layer through screen printing, after the whole area on the back surface of the substrate is subjected to vacuum coating, the metal layer can be shielded by the ground color layer after a certain amount, and the metal feeling can be presented only at the pattern groove when the metal layer is observed from the front surface of the substrate, so that the process is simplified.

Further, the vacuum coating process in S3 specifically includes the following operations: placing the substrate treated by the S2 in a vacuum coating machine, wherein the target is aluminum, and the distance between the target and the substrate is 100-200 mm; vacuum-pumping to 5.0 × 10^-3Pa, introducing argon, and controlling the vacuum degree to be 0.4-0.6 Pa; and plating a metal layer on the whole area of the back of the substrate by adopting magnetron sputtering coating.

Further, the coating current in S3 is 70-80A, the coating time is 1-3min, and the temperature in the furnace is 60-70 ℃.

Further, the spray protection in S4 means: spraying color paint on the surface of the base material treated by S3, baking for 3-5min at the temperature of 60-65 ℃, and obtaining a primer layer with the thickness of 20-40 mu m after ultraviolet irradiation with the total absorption energy value of 800 and 1000 mJ/square centimeter; then spraying varnish on the primer layer, and baking for 30-40min at the temperature of 60-70 ℃ to obtain a varnish layer with the thickness of 10-20 mu m.

By adopting the technical scheme, after the metal layer is obtained by vacuum coating on the substrate, the adhesive force between the metal layer and the substrate can be improved through spraying protection, the metal layer is prevented from falling off, and the service life of the product is prolonged.

Further, the colored paint is prepared from the following raw materials in parts by weight: 40-50 parts of polyamino acrylate, 20-25 parts of trimethylolpropane triacrylate, 25-30 parts of tripropylene glycol diacrylate, 3-5 parts of isobutyl acetate, 3-5 parts of acetone, 3-5 parts of isobornyl methacrylate, 1-2 parts of gamma-aminopropyl triethoxysilane and 1-2 parts of 1-hydroxy-cyclohexyl-phenyl ketone.

By adopting the technical scheme, the colored paint has a protection effect on the metal layer on the base material, and can improve the adhesive force between the metal layer and the base material; the colored paint also has the advantages of high leveling property, high fullness and scratch resistance, and can greatly prolong the service life of products.

Further, the colored paint is prepared by adopting the following method: 40-50 parts of polyamino acrylate and 20-25 parts of trimethylolpropane triacrylate by weight part, and stirring and dispersing for 10-15 min; then adding 25-30 parts of tripropylene glycol diacrylate, 3-5 parts of isobutyl acetate, 3-5 parts of acetone, 3-5 parts of isobornyl methacrylate and 1-2 parts of gamma-aminopropyltriethoxysilane, stirring at high speed for 5-10min, adding 1-2 parts of 1-hydroxy-cyclohexyl-phenyl ketone, and stirring at high speed for 30-40min to obtain the colored paint.

In summary, compared with the prior art, the invention has the following beneficial effects:

after the back of the plastic plate is printed, ink can be attached to the area without the pattern groove, when vacuum coating is carried out, one part of metal ions are filled to the pattern groove, the other part of metal ions cover the area without the pattern groove, so that the metal layer can be formed in the whole area of the back of the base material, and as the area without the pattern groove is coated with the ink through screen printing, the ink in the area without the pattern groove can shield the metal layer when the front of the base material is observed, at the moment, only the color of the ink can be seen in the area, and the metal layer in the area with the pattern groove can penetrate through the transparent or semitransparent base material, so that the front of the base material presents texture metal; through the operation, the process flow is greatly simplified, and the production efficiency is improved.

Detailed Description

The present invention will be described in further detail below.

First, preparation example of colored paint:

the urethane acrylate in the following preparation examples was selected from aliphatic urethane acrylates having a model number of 3320, available from Australian Polymer materials Co.Ltd, Dongguan.

Preparation example 1: 40kg of polyamino acrylate and 20kg of trimethylolpropane triacrylate, and stirring and dispersing at the speed of 300/r/min for 10 min; then 25kg of tripropylene glycol diacrylate, 3kg of isobutyl acetate, 3kg of acetone, 3kg of isobornyl methacrylate, 3kg of isooctyl methacrylate and 1kg of gamma-aminopropyltriethoxysilane were added, and the mixture was stirred at 2000r/min for 5min, and after 1kg of 1-hydroxy-cyclohexyl-phenyl ketone was added, the mixture was stirred at 2000r/min for 30min to obtain a colored paint.

Preparation example 2: 45kg of polyamino acrylate and 22.5kg of trimethylolpropane triacrylate are stirred and dispersed for 12min at the speed of 300/r/min; then 27.5kg of tripropylene glycol diacrylate, 4kg of isobutyl acetate, 4kg of acetone, 4kg of isobornyl methacrylate, 4kg of isooctyl methacrylate and 1.5kg of gamma-aminopropyltriethoxysilane were added thereto, and the mixture was stirred at 2000r/min for 8min, 1.5kg of 1-hydroxy-cyclohexyl-phenyl-methanone was added thereto, and then stirred at 2000r/min for 35min to obtain a colored paint.

Preparation example 3: 50kg of polyamino acrylate and 25kg of trimethylolpropane triacrylate, and stirring and dispersing at the speed of 300/r/min for 15 min; then 30kg of tripropylene glycol diacrylate, 5kg of isobutyl acetate, 5kg of acetone, 5kg of isobornyl methacrylate, 5kg of isooctyl methacrylate and 2kg of gamma-aminopropyltriethoxysilane were added, and the mixture was stirred at 2000r/min for 10min, and after 2kg of 1-hydroxy-cyclohexyl-phenyl ketone was added, the mixture was stirred at 2000r/min for 40min to obtain a colored paint.

Preparation example 4: this production example is different from production example 1 in that isobornyl methacrylate, isooctyl methacrylate, and γ -aminopropyltriethoxysilane were not contained in the raw materials.

Preparation example 5: this production example is different from production example 1 in that isobornyl methacrylate and isooctyl methacrylate are not contained in the raw materials.

Second, examples the screen printing inks of the following examples were selected from black ink of type HC, available from Rongai ink coatings technology Inc. of Dongguan; the varnish is selected from the group of varnishes available from PPG company, usa under the model number PPG 660.