A method for multi-color vacuum coating of a thin substrate

Abstract

This application relates to the technical field of multi-color vacuum coating for thin substrates, and in particular to a method for multi-color vacuum coating of thin substrates, which includes a series of process treatments such as cutting, cleaning, coating with ink, baking, curing, exposure, development, etching, vacuum coating, coating with ink again, laser engraving, second etching, cleaning, second vacuum coating, coating with anti-fingerprint oil, laminating, stamping and forming, etc., to form a first coating plate and a second coating plate with two color layers, and a specific alkaline etching solution and a cleaning solution containing active ingredients are used to meet the high-precision requirements of thin substrates. This application achieves the technical effects of improving the coating quality, having strong coating adhesion and beautiful multi-color effects.

Description

Technical Field

[0001] The present application relates to the technical field of multi-color vacuum coating for thin substrates, and in particular, to a method for multi-color vacuum coating of thin substrates. Background Art

[0002] With the rapid development of society and the continuous update of aesthetic concepts, diversified product designs are increasingly favored by the market. Especially for the appearance design of some high-end products, diversified color combinations have become a trend, which not only improves the aesthetic feeling of the products but also enhances the market competitiveness. However, traditional manufacturing processes often struggle to meet this demand, especially in the multi-color processing of fine components, presenting significant challenges.

[0003] Existing car horn grilles usually have only one color. To achieve a two-color or multi-color effect, the common approach is to use a paint pen or brush to fill for local masking and combine with a coating process to achieve the multi-color effect. In addition, different colors can be sprayed to obtain a multi-color appearance. Although these two methods can achieve the multi-color effect to a certain extent, when dealing with components with complex details, especially those with small through-holes and semi-engraved structures, it is often difficult to ensure the high-precision quality of the multi-color surface coating and the stability after coating. In practical applications, using a paint pen or brush to fill requires very high manual skills to ensure that it does not affect the colors in adjacent areas, while spraying multiple colors makes it difficult to maintain clear boundaries between colors under complex patterns.

[0004] The main problems of the above conventional means when applied to products with small structures are high operation difficulty, low production efficiency, and easy staining of adjacent areas. For example, during the filling process, very high requirements are placed on the technique, and a slight mistake will affect the colors of other parts; in the case of spraying multiple colors, it is difficult to ensure clear boundaries between each color, especially in the case of complex patterns, it is even more difficult to avoid the occurrence of color mixing. In addition, existing coating processes also have problems in terms of the stability after coating and cannot meet the high-standard product requirements. Therefore, how to achieve precise and stable surface multi-color coating has become a key problem to be solved urgently. Summary of the Invention

[0005] In order to ensure the stability of the multi-color coating pattern in mass production, improve product quality and product qualification rate, the present application provides a method for multi-color vacuum coating of thin substrates.

[0006] The present application provides a method for multi-color vacuum coating of thin substrates, which is obtained by the following method:

[0007] 1) Cut and clean the substrate to obtain a sample piece;

[0008] 2) Coating the sample with ink, baking, and curing to form a first ink layer, then exposing, developing, and performing a first etching to etch the ink layer, removing the ink, and cleaning, so that the etched area forms an etched pattern with the width of the etched pattern being 0.5 - 1.5 mm, obtaining an etched part;

[0009] 3) Performing vacuum coating on the etched pattern of the etched part to form a first color layer, obtaining a first coated part;

[0010] 4) Coating ink again on the surface of the first coated part, baking, and curing to form a second ink layer, then laser engraving to form a laser engraving pattern on the first coated part, and the first color layer does not overlap with the laser engraving pattern, with the texture width of the laser engraving pattern being 0.5 - 1.5 mm, obtaining a laser engraved part;

[0011] 5) Performing a second etching on the laser engraving pattern of the laser engraved part, then cleaning, and performing a second vacuum coating to form a second color layer on the laser engraving pattern of the laser engraved part, removing the ink, obtaining a second coated part;

[0012] 6) Coating the second coated part with fingerprint - proof oil, laminating, and stamping to obtain a multi - colored product on a thin substrate.

[0013] By adopting the above - mentioned technical solution, this multi - colored vacuum coating method for a thin substrate achieves a fine multi - colored coating effect on the product surface.

[0014] Specifically, in step 1), the substrate is cut into a suitable size and then cleaned to ensure that there is no stain on the surface of the substrate, facilitating the subsequent coating process.

[0015] In step 2), after coating the ink and baking, the ink is completely cured to form a uniformly coated first ink layer on one surface of the substrate. Then, through exposure and development, the part to be etched is exposed, facilitating etching. After etching, the ink at the etched position becomes loose and falls off. The ink is removed, and then cleaned to completely remove the residual ink. At this time, the etched area forms an etched pattern, and the etched patterns form an etched pattern.

[0016] In step 3), vacuum coating is performed on the etched pattern presented by the etched part, so that a vacuum coating layer is plated on the etched pattern to achieve the coating of the first color layer.

[0017] In step 4), ink is coated again. At this time, the ink covers the side of the first color layer of the entire etched part, and then baking and curing are performed to obtain a second ink layer. During the laser engraving process, a laser engraving pattern is formed on the first coated part, and the first color layer does not overlap with the laser engraving pattern. This laser engraving process removes a part of the ink layer thickness to form a laser engraving pattern, facilitating subsequent etching treatment to ensure processing accuracy and production efficiency.

[0018] In step 5), the laser engraved pattern obtained in step 4) is etched. At this time, all the remaining thickness is etched away, and after cleaning, a second color layer is formed on its surface; due to two coatings, it is difficult to completely remove the ink layer in a short time, and a certain depth is formed in the laser engraving process, which is convenient for subsequent vacuum coating, maintaining the progress of etching, and improving production efficiency.

[0019] Step 6), applying nail polish, laminating and other processes to obtain products with various colors and fine textures.

[0020] In summary, a clean base is formed through cutting and cleaning; ink is applied and etched lines are formed through exposure, development and etching, and then the first color layer is formed through vacuum coating; ink is applied again and laser engraving is used to form a laser engraving pattern that does not overlap with the first color layer; the subsequent secondary etching and vacuum coating further form the second color layer on the laser engraving pattern; finally, anti-fingerprint oil is applied, lamination and stamping are performed to form the product with a complex two-color effect. This process step can not only achieve precise coating stability within the width range of 0.5-1.5mm, but also improve the quality and production efficiency of multi-color products.

[0021] Preferably, both the first etching and the second etching use an alkaline etching solution.

[0022] By adopting the above technical solution, it is ensured that alkaline etching solution is used in both the first etching and the second etching, which improves the etching accuracy and efficiency, thereby achieving precise etching of complex patterns on the surface of fine substrates, effectively avoiding the high requirements of traditional filling methods on personnel techniques and the color pollution problems that may be caused, and significantly improving the appearance quality and production efficiency of multi-color coated products.

[0023] Preferably, the alkaline etching solution consists of sodium hydroxide, potassium permonosulfate complex salt, sodium hexametaphosphate and water.

[0024] By adopting the above technical solution, the alkaline etching solution is composed of sodium hydroxide, potassium permonosulfate complex salt, sodium hexametaphosphate and water, which ensures precise control of fine lines during the etching process, avoids unnecessary influence on other areas, and improves etching accuracy.

[0025] Preferably, in the specific processes of the first vacuum coating and the second vacuum coating, a target material is used and then magnetron sputtering is performed to form a coating layer.

[0026] By adopting the above technical solution, using target materials and forming a coating layer through magnetron sputtering, it is possible to achieve precise coating on the surface of a fine substrate, ensure the uniformity and adhesion of the coating, and effectively improve the quality and aesthetics of multi-color coated products.

[0027] Preferably, the sputtering gas pressure is 0.3 - 0.5 Pa, the sputtering power is 10 - 15 Kw, the target-substrate distance is 20 - 50 mm, the sputtering temperature is 70 - 80 °C, and the gas flow rate is 300 - 800 ml / min.

[0028] By adopting the above technical solution, precise control of sputtering parameters during the multi-color vacuum coating process of thin substrates is achieved, ensuring the quality and uniformity of the coating layer, and improving the coating efficiency and product reliability. Specifically, the sputtering gas pressure is set within the range of 0.3 - 0.5 Pa, which is beneficial to maintaining a stable plasma state and ensuring the density and adhesion of the coating layer; the sputtering power is set between 10 - 15 Kw, which can effectively balance the relationship between productivity and coating quality; the target-substrate distance is selected within 20 - 50 mm, which helps to enhance the uniformity of thin film deposition; the sputtering temperature is set in the range of 70 - 80 °C, which can improve the atomic migration ability of materials and promote thin film crystallization; the gas flow rate is adjusted to 300 - 800 ml / min, optimizing the gas utilization rate and further improving the coating quality and production efficiency.

[0029] Preferably, the thickness of the first color layer is 18 - 30 μm, and the thickness of the second color layer is 18 - 30 μm.

[0030] By adopting the above technical solution, the thickness of the first color layer is controlled within 18 - 30 μm, enabling the first color layer to not only have good coverage and uniformity but also ensure the appearance texture after coating and facilitate etching, thus guaranteeing the accuracy of etching and improving the processing efficiency; the thickness of the second color layer is controlled within 18 - 30 μm, ensuring the adhesion and durability of the second color layer, further enhancing the decorative and functional properties of the product. At the same time, it guarantees the accuracy of etching and the convenience of processing.

[0031] Preferably, the cleaning agent used in the cleaning processes in step 2) and step 4) is an acid anhydride-containing active cleaning solution.

[0032] By adopting the above technical solution, the acid anhydride-containing active cleaning solution can effectively remove grease, dirt, and other impurities on the substrate surface, improve the cleanliness and gloss of the substrate surface, and improve the polarity and wettability of the substrate surface. At the same time, it provides anti-rust and anti-oxidation protection, providing a clean and pollution-free substrate for subsequent processing or treatment. Thereby improving the coating convenience and coating stability of the substrate surface, enabling the formed first color layer and second color layer to have high adhesion, avoiding the possibility of peeling off during use or during processes such as cleaning, etching, and deinking, and improving its practicality.

[0033] Preferably, the acid anhydride-containing active cleaning solution is composed of the following raw materials by weight percentage:

[0034] Ethylene glycol dimethyl ether 3 - 5%

[0035] Coconut oil fatty acid diethanolamide 0.5-1.5%

[0036] Alkenyl succinic anhydride 1.3-1.8%

[0037] N,N-(4-methyl-1,3-phenylene)bismaleimide 0.5-1%

[0038] Double activated group siloxane 0.3-1%

[0039] Potassium peroxymonosulfate complex salt 0.01-0.05%

[0040] The balance is water.

[0041] By adopting the above technical scheme, ethylene glycol dimethyl ether not only dilutes and promotes the dissolution of alkenyl succinic anhydride, but also promotes the dissolution of the ink layer in the texture; coconut oil fatty acid diethanolamide increases the surface activity and wets the surface of the texture, which helps N,N-(4-methyl-1,3-phenylene) bismaleimide and diactivated group siloxane to adhere to its surface.

[0042] After the above ingredients are compounded, they can enhance the cleaning effect, improve wettability, enhance stability and corrosion inhibition performance, and form a protective layer on the texture surface to prevent oxidation corrosion of the substrate before vacuum coating, making the substrate surface easy to coat and improving the adhesion stability of the color layer formed after coating.

[0043] When the raw material system of the cleaning liquid containing anhydride is used, after cleaning, the raw material system is easily adsorbed on the surface of the substrate. When vacuum coating is performed, the coating temperature is 70-80°C. At this time, the raw material system adsorbed on the surface of the material is further solidified under the influence of temperature and other factors to form a film layer that stably adheres to the coating layer and the substrate, thereby significantly improving the stability of the coating.

[0044] Reduce the possibility of the first color layer and the second color layer falling off, while promoting the accuracy of the coating. Improve the production efficiency and quality of fine substrate multi-color products in the mass production process. At the same time, reduce the possibility of the first color layer and the second color layer of fine substrate multi-color products falling off during use.

[0045] Preferably, the dual-activated group siloxane is cyclohexyl-γ-aminopropylmethyldimethoxysilane and / or bis-3-methylacryloxypropylated tetramethyldisiloxane.

[0046] By adopting the above technical solution, cyclohexyl-γ-aminopropylmethyldimethoxysilane and bis-3-methacryloxypropyltetramethyldisiloxane are used as siloxanes with dual activation groups, which improve the polarity and wettability of the substrate surface, effectively remove impurities such as grease, dirt, and dust on the substrate surface, and at the same time improve the thermal stability, mechanical strength, and chemical corrosion resistance of the material, and protect the substrate surface from corrosion and oxidation effects, further ensuring the high-quality production of fine substrate multi-color products in subsequent processes.

[0047] Preferably, the weight ratio of the cyclohexyl-γ-aminopropylmethyldimethoxysilane to the bis-3-methacryloxypropyltetramethyldisiloxane is 1:(0.2-1).

[0048] By adopting the above technical solution, the weight ratio of cyclohexyl-γ-aminopropylmethyldimethoxysilane to bis-3-methacryloxypropyltetramethyldisiloxane is 1:(0.2-1), which effectively improves the polarity and wettability of the substrate surface and thoroughly removes impurities such as grease, dirt, and dust on the substrate surface, ensuring a high-quality and highly clean substrate surface in subsequent processing.

[0049] In summary, the present application has the following beneficial effects:

[0050] 1. By adopting a specific etching process and vacuum coating technology, the present application can achieve high-precision multi-color surface coating on products with fine structures, solving the problem of adjacent area staining caused by difficult operation in traditional processes;

[0051] 2. Using a special acid anhydride-containing cleaning agent formula, effectively removes grease, dirt, and other impurities on the substrate surface, improves the stability and adhesion of subsequent coatings, and thus enhances the quality and durability of the final product;

[0052] 3. Combining precise coating, curing, etching, cleaning, and laser engraving processes, the present application achieves two-color and multi-color coating effects on fine patterns (width 0.5-1.5 mm), solves the problem of unclear boundaries between colors under complex patterns, and significantly enhances the aesthetics and market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a picture obtained by a method for multi-color vacuum coating of a fine substrate of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] The following further describes the present application in detail in conjunction with the attached Figure 1 drawings and embodiments.

[0055] Introduction to some raw materials:

[0056] The deinking agent consists of ethylene glycol dimethyl ether, isopropanol, OP-10, absolute ethanol, sodium bicarbonate, and water in a weight ratio of 1:1:0.1:0.9:0.5:2.5;

[0057] The cleaning agent consists of OP-10, absolute ethanol, sodium bicarbonate, water, and potassium hydroxide in a weight ratio of 0.1:1:0.3:10:0.1; Ink: Guangzhou Weiqiao New Materials Co., Ltd., model ME-001;

[0058] The target material for the first time is: tin dioxide target, black, purity 99%;

[0059] The target material for the second time is: titanium nitride target, golden yellow, purity 99%;

[0060] The molecular structure of alkenyl succinic anhydride is as follows:

[0061]

[0062] Preparation example of acid anhydride-containing active cleaning solution

[0063] Preparation example 1

[0064] An acid anhydride-containing active cleaning solution is prepared by the following method:

[0065] Weigh 1.3% of alkenyl succinic anhydride and dissolve it in 3% of ethylene glycol dimethyl ether by weight percentage to obtain mixture A; then weigh 1.5% of coconut oil fatty acid diethanolamide, 1% of N,N-(4-methyl-1,3-phenylene) bismaleimide, 0.3% of bis-activated group siloxane, 0.01% of potassium monopersulfate compound salt, 92.89% of water and all of mixture A and put them into a stirring device, stir at a speed of 100 r / min until all are fully mixed uniformly to obtain the acid anhydride-containing active cleaning solution.

[0066] The bis-activated group siloxane is cyclohexyl-γ-aminopropylmethyldimethoxysilane.

[0067] Preparation examples 2-3

[0068] The differences between preparation examples 2-3 and preparation example 1 are: the raw material dosages are different, as shown in Table 1 specifically;

[0069] Table 1 Raw material dosages of preparation examples 1-3 (%)

[0070] Raw material Preparation Example 1 Preparation Example 2 Preparation Example 3 Ethylene glycol dimethyl ether 3 4 5 Coconut oil fatty acid diethanolamide 1.5 1 1 Alkenyl succinic anhydride 1.3 1.5 1.8 N,N-(4-methyl-1,3-phenylene) bismaleimide 1 0.8 2 Bis-activated group siloxane 0.3 0.6 0.8 Potassium peroxymonosulfate compound salt 0.01 0.02 0.03 Water 92.89 92.08 89.37

[0071] Preparation example 4

[0072] The difference between preparation example 4 and preparation example 2 is: the bis-activated group siloxane is bis-3-methacryloxypropylated tetramethyldisiloxane.

[0073] Preparation Example 5

[0074] The difference between Preparation Example 5 and Preparation Example 2 is that the bis-activated group siloxane is composed of cyclohexyl-γ-aminopropylmethyldimethoxysilane and bis-3-methacryloxypropylated tetramethyldisiloxane with a weight ratio of 1:0.2.

[0075] Preparation Example 6

[0076] The difference between Preparation Example 6 and Preparation Example 2 is that the bis-activated group siloxane is composed of cyclohexyl-γ-aminopropylmethyldimethoxysilane and bis-3-methacryloxypropylated tetramethyldisiloxane with a weight ratio of 1:0.5.

[0077] Preparation Example 7

[0078] The difference between Preparation Example 7 and Preparation Example 2 is that the bis-activated group siloxane is composed of cyclohexyl-γ-aminopropylmethyldimethoxysilane and bis-3-methacryloxypropylated tetramethyldisiloxane with a weight ratio of 1:1.

[0079] Preparation Comparative Example

[0080] Preparation Comparative Example 1

[0081] The difference between Preparation Comparative Example 1 and Preparation Example 1 is that the alkenyl succinic anhydride is replaced with coconut oil fatty acid diethanolamide in equal amount.

[0082] Preparation Comparative Example 2

[0083] The difference between Preparation Comparative Example 2 and Preparation Example 1 is that the N,N-(4-methyl-1,3-phenylene) bismaleimide is replaced with coconut oil fatty acid diethanolamide in equal amount.

[0084] Preparation Comparative Example 3

[0085] The difference between Preparation Comparative Example 3 and Preparation Example 1 is that the bis-activated group siloxane is replaced with coconut oil fatty acid diethanolamide in equal amount.

[0086] Example

[0087] Example 1

[0088] A fine substrate multi-color vacuum coating is prepared by the following method:

[0089] 1) Transfer the substrate made of 304 stainless steel to the cutting mechanism for cutting, then transfer it to the cleaning tank containing the cleaning agent and soak for 1 min, then rinse it with tap water and dry it in an oven at 100°C for 1 min to complete the cleaning and obtain a sample;

[0090] 2) Transfer the sample to the coating mechanism, apply ink coating, then enter an oven at 100 °C for 1 minute of drying and baking, and then irradiate with a UV lamp for 80 s to completely cure it, forming a first ink layer on the surface of the sample. Then, perform exposure and development processes, and transfer it to the etching mechanism for a first etching to etch the ink layer and peel off the etched ink to complete ink removal. Then, transfer it to the cleaning mechanism and spray-clean it with an active cleaning solution. During this spraying process, the active cleaning solution is aimed at the etched position and sprayed at a working pressure of 200 bar for 10 s of cleaning time, thereby cleaning the remaining stains, dust, and ink. Then, air-dry the water on its surface to form an etched pattern in the etched area. The width of this etched pattern can be uniform or non-uniform. In this embodiment, the pattern is preferably non-uniform, and the width of the pattern is within 0.5 - 1.5 mm, and the etched patterns form an etched pattern to obtain an etched part;

[0091] 3) Transfer the etched part to a vacuum coating mechanism to vacuum coat the etched patterns on the etched part and form a first color layer on the etched patterns to obtain a first coated part;

[0092] 4) Transfer the first coated part to another coating mechanism to coat ink on the side with the first color layer of the first coated part, bake and cure it. This baking and curing process is the same as in step 2. A second ink layer is formed on the first coated part, and then laser engraving is performed. The laser frequency is 40000 Hz, and the laser engraving depth is 20 μm. A laser engraving pattern is formed on the first coated part, and the first color layer does not coincide with the laser engraving pattern. The texture width of the laser engraving pattern can be uniform or non-uniform. In this embodiment, the pattern is preferably non-uniform, and the width of the texture is within 0.5 - 1.5 mm to obtain a laser engraved part;

[0093] 5) Transfer the laser engraved part to another etching mechanism. At this time, the temperature on the laser engraving pattern is 80 °C, which is convenient for etching the laser engraving pattern of the laser engraved part to achieve secondary etching of the substrate. During the etching process, most of the ink layer falls off, and then it is transferred to another cleaning mechanism for cleaning. This cleaning process is the same as in step 2), but the cleaning object is the laser engraved coating after etching, and the working pressure is 250 bar and the cleaning time is 20 s. Then, transfer it to another vacuum coating mechanism to perform a second vacuum coating on the laser engraving pattern after cleaning, forming a second color layer on the laser engraving pattern of the laser engraved part. Transfer it to a tank containing a deinking agent and soak it for 1 minute to make all the ink layers on its surface fall off, then rinse it with clean water and dry the water on the surface to complete ink removal to obtain a second coated part;

[0094] 6) Coat AF anti-fingerprint oil on the second coated part, cover a protective film on the surfaces of its first color layer and second color layer, and then perform stamping to obtain a multi-color product of a fine substrate. This multi-color product refers to Figure 1As shown, the golden lines in the figure are the second color layer, and the black lines are the first color layer.

[0095] The transmission rate in the transmission process of the above process is 10 s / m.

[0096] The alkaline etching solution is composed of sodium hydroxide, potassium peroxymonosulfate compound salt, sodium hexametaphosphate and water in a weight ratio of 1:0.3:0.5:10.

[0097] The vacuum coating process in steps 3) and 5): Using a target material, and then forming a coating layer through magnetron sputtering. The sputtering gas pressure is 0.3 Pa, the sputtering power is 15 Kw, the target-substrate distance is 20 mm, the sputtering temperature is 70 °C, and the gas flow rate is 300 ml / min.

[0098] The target material for the first time is tin dioxide target; the target material for the second time is titanium nitride.

[0099] The thickness of the first color layer is 18 μm, and the thickness of the second color layer is 18 μm.

[0100] By weight, the active cleaning solution is composed of 5% ethylene glycol dimethyl ether, 1% potassium peroxymonosulfate compound salt, and 94% water.

[0101] Example 2

[0102] The difference between Example 2 and Example 1 is that the vacuum coating parameters are different, specifically as follows:

[0103] The sputtering gas pressure is 0.5 Pa, the sputtering power is 12 Kw, the target-substrate distance is 40 mm, the sputtering temperature is 75 °C, and the gas flow rate is 500 ml / min.

[0104] And the thickness of the first color layer is 25 μm, the thickness of the second color layer is 25 μm, and the rest are the same.

[0105] Example 3

[0106] The difference between Example 3 and Example 1 is that the vacuum coating parameters are different, specifically as follows:

[0107] The sputtering gas pressure is 0.4 Pa, the sputtering power is 10 Kw, the target-substrate distance is 50 mm, the sputtering temperature is 80 °C, and the gas flow rate is 800 ml / min, and the thickness of the first color layer is 30 μm, the thickness of the second color layer is 30 μm, and the rest are the same.

[0108] Example 4

[0109] The difference between Example 4 and Example 1 is that: the cleaning solution is the acid anhydride-containing active cleaning solution obtained in Preparation Example 1.

[0110] Examples 5 - 13

[0111] Examples 5-13 are different from Example 4 in that the acid anhydride-containing active cleaning solution is different, as specifically shown in Table 2;

[0112] Table 2 Sources of Acid Anhydride-Containing Active Cleaning Solutions for Examples 4-13

[0113] Example Source of acid anhydride-containing active cleaning solution Example 4 Preparation Example 1 Example 5 Preparation Example 2 Example 6 Preparation Example 3 Example 7 Preparation Example 4 Example 8 Preparation Example 5 Example 9 Preparation Example 6 Example 10 Preparation Example 7 Example 11 Comparative Document 1 Example 12 Comparative Document 2 Example 13 Comparative Document 3

[0114] Comparative Example

[0115] Comparative Example 1

[0116] Comparative Example 1 is different from Example 1 in that there is no laser engraving process in Step 4.

[0117] Performance Detection Test

[0118] Detection Method / Test Method Qualification Rate: Observe whether there are defects such as incomplete patterns, color mixing, unclear patterns, uneven textures, different texture patterns from the sample, and significantly different texture widths in the same area (e.g., compare the textures on the sample and the product obtained in production. If the width of the corresponding texture on the product is significantly different from that on the sample, such as the position error value being greater than 0.1 mm) on the surface of the multi-color product of the thin substrate obtained in Examples 1-13 and Comparative Example 1. If there is one or more of these phenomena, it is recorded as unqualified, and the qualification rate is calculated.

[0119] Adhesion Stability: GB / T9286-2021, tested using the cross-cut method. Specifically: Use 3M600 test tape to stick on the first color layer and the second color layer of the second coated part, press it flat with a force of 20 N to ensure no bubbles or looseness, peel the tape at a uniform speed, observe through a magnifying glass, and calculate the proportion of the peeled area.

[0120] The specific process is shown in Table 4;

[0121] Table 4 Experimental Data of Examples 1-13 and Comparative Example 1

[0122] Test item Qualified rate (%) Proportion of shedding area (%) Example 1 91 1.66 Example 2 92 1.72 Example 3 91 1.76 Example 4 97 0.64 Example 5 98 0.57 Example 6 98 0.59 Example 7 97 0.67 Example 8 100 0.35 Example 9 100 0.16 Example 10 100 0.27 Example 11 95 1.23 Example 12 96 1.32 Example 13 96 1.19 Comparative Example 1 84 5.89

[0123] Combining Example 1 and Comparative Example 1 and referring to Table 3, it can be seen that the qualification rate of Comparative Example 1 is lower than that of Example 1, and the proportion of the peeled area of Comparative Example 1 is higher than that of Example 1, indicating that the adhesion stability of vacuum coating can be further improved through the process steps of this application, and the adhesion stability, production efficiency, and product qualification rate of the product during production can be improved.

[0124] By comparing Comparative Example 2 and Example 4 and in combination with Table 3, it can be seen that the qualified rate of Example 2 is lower than that of Example 4, and the proportion of the peeling area of Example 2 is higher than that of Example 4. This shows that the acid anhydride-containing active cleaning agent prepared by compounding ethylene glycol dimethyl ether, coconut oil fatty acid diethanolamide, alkenyl succinic anhydride, N,N-(4-methyl-1,3-phenylene) bismaleimide, dual-activated group siloxane, potassium peroxymonosulfate compound salt, and water has a better cleaning effect, can remove residual oil stains, dirt, etc. at the same time, can improve the adhesion stability of vacuum coating, further improve the adhesion stability of the first color layer and the second color layer, reduce the occurrence of peeling and other phenomena, and improve the quality of the multi-color product with a fine substrate.

[0125] By comparing Comparative Example 11 and Example 4 and in combination with Table 3, it can be seen that the qualified rate of Example 11 is lower than that of Example 4, and the proportion of the peeling area of Example 11 is higher than that of Example 4. This shows that when ethylene glycol dimethyl ether, coconut oil fatty acid diethanolamide, alkenyl succinic anhydride, N,N-(4-methyl-1,3-phenylene) bismaleimide, dual-activated group siloxane, potassium peroxymonosulfate compound salt, and water are compounded, better comprehensive effects can be obtained, the adhesion stability of the first color layer and the second color layer can be further improved, the occurrence of peeling and other phenomena can be reduced, and the quality of the multi-color product with a fine substrate can be improved.

[0126] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A method for multi-color vacuum coating of a thin substrate, characterized in that, Prepared by the following method: 1) Cut and wash the substrate to obtain a sample piece; 2) Coat the sample piece with ink, bake and cure it to form a first ink layer, then expose, develop, and perform a first etching to etch the ink layer, remove the ink, wash it, and the etched area forms an etching pattern with a width of 0.5 - 1.5 mm to obtain an etched piece; 3) Perform a first vacuum coating on the etching pattern of the etched piece to form a first color layer to obtain a first coated piece; 4) Coat the surface of the first coated piece with ink again, bake and cure it to form a second ink layer, then laser engrave to form a laser engraving pattern on the first coated piece, and the first color layer does not coincide with the laser engraving pattern, and the texture width of the laser engraving pattern is 0.5 - 1.5 mm to obtain a laser engraved piece; 5) Perform a second etching on the laser engraving pattern of the laser engraved piece, then wash it, and perform a second vacuum coating to form a second color layer on the laser engraving pattern of the laser engraved piece, remove the ink to obtain a second coated piece; 6) Coat the second coated piece with fingerprint-proof oil, laminate it, and stamp it to obtain a multi-color product of a fine substrate; The cleaning agent used in the cleaning process in steps 2) and 4) is an acid anhydride-containing active cleaning solution; The acid anhydride-containing active cleaning solution is composed of the following raw materials in weight percentages: Ethylene glycol dimethyl ether 3 - 5% Coconut oil fatty acid diethanolamide 0.5 - 1.5% Alkenyl succinic anhydride 1.3 - 1.8% N,N-(4-methyl-1,3-phenylene)bismaleimide 0.5 - 1% Bis-activated group siloxane 0.3 - 1% Potassium peroxymonosulfate compound salt 0.01 - 0.05% The balance is water.

2. The method for multi-color vacuum coating of a thin substrate according to claim 1, characterized in that: Both the first etching and the second etching use an alkaline etching solution.

3. A method for multi-color vacuum coating of a thin substrate according to claim 2, characterized in that: The alkaline etching solution is composed of sodium hydroxide, potassium peroxymonosulfate compound salt, sodium hexametaphosphate, and water.

4. A method for multi-color vacuum coating of a thin substrate according to claim 1, characterized in that: In the specific processes of the first vacuum coating and the second vacuum coating: Use a target material, and then form a coating layer through magnetron sputtering.

5. A method for multi-color vacuum coating of a thin substrate according to claim 4, characterized in that: The sputtering gas pressure is 0.3 - 0.5 Pa, the sputtering power is 10 - 15 Kw, the target-substrate distance is 20 - 50 mm, the sputtering temperature is 70 - 80 °C, and the gas flow rate is 300 - 800 ml / min.

6. A method for multi-color vacuum coating of a thin substrate according to claim 1, characterized in that: The thickness of the first color layer is 18 - 30 μm, and the thickness of the second color layer is 18 - 30 μm.

7. A method for multi-color vacuum coating of a thin substrate according to claim 1, characterized in that: The bis-activated group siloxane is cyclohexyl-γ-aminopropylmethyldimethoxysilane and / or bis-3-methacryloxypropylated tetramethyldisiloxane.

8. A method for multi-color vacuum coating of a thin substrate according to claim 7, characterized in that: The weight ratio of cyclohexyl-γ-aminopropylmethyldimethoxysilane to bis-3-methacryloxypropylated tetramethyldisiloxane is 1:(0.2 - 1).

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