A method for preparing automobile logo plate

Abstract

The present application relates to the technical field of identification plate processing, and more specifically, to a method for preparing automobile identification plates. The method comprises the following steps: milling: processing one side of the plate to form a first convex surface, a second convex surface, and a concave surface, thereby obtaining a milled part; first anode: cleaning the milled part, anodizing it to form a first-color oxide film, and sealing the holes to obtain a first anode part; first laser engraving: laser engraving all surfaces of the first anode part except the first convex surface, the second convex surface, and the concave surface to completely remove the first-color oxide film, thereby obtaining a first laser engraved part; second laser engraving: laser engraving the second convex surface of the first laser engraved part to form a dark-color layer, thereby obtaining a second laser engraved part; second anode: anodizing the second laser engraved part to coat all surfaces of the second laser engraved part except the concave surface and the first convex surface with a second-color oxide film, and sealing the holes to obtain an automobile identification plate. This process improves the production efficiency and quality of automobile identification plates.

Description

Technical Field

[0001] The present application relates to the technical field of identification plate processing, and more specifically, to a method for preparing an automobile identification plate. Background Art

[0002] As a key decorative component, automotive logos and labels are widely used in automobile manufacturing and electronic product production. As consumer expectations for product appearance and quality continue to rise, the manufacturing process for these labels is also evolving. Traditionally, these labels are primarily manufactured through processes such as casting, stamping, and spraying. While mature, these techniques have limitations in terms of detail processing and color consistency. Especially for the high-end market, these labels require higher precision, richer color expression, and stronger weather resistance to meet increasingly stringent design requirements and technical standards.

[0003] In the existing logo and OEM manufacturing process, common methods include but are not limited to: 1) Casting and stamping: forming through molds, and then performing surface treatment such as painting, electroplating, etc., but this method has difficulty in achieving complex patterns and fine color control; 2) Laser engraving: using a laser beam to carve the desired pattern on the surface of the card, and then painting, but the depth and accuracy of laser engraving are limited, and the cost is relatively high; 3) Spraying and screen printing: forming patterns on the surface of the card by spraying or screen printing, but these methods have difficulties in detail processing and are prone to problems such as color difference and uneven coating.

[0004] Although the above methods can meet the production needs of logo and OEM to a certain extent, there are still some obvious shortcomings. For example, when dealing with the problem of ink filling in concave areas, due to the limited space, automated equipment is difficult to complete. Manual operation is usually required, and repeated corrections and ink replenishment are required, which is time-consuming and has low production efficiency. In addition, the ink is prone to local adhesion during the deinking process, making deinking difficult. Increasing the deinking time will damage the anodized layer, affecting product quality, and its color often does not meet customer requirements. Therefore, the existing logo and OEM production process is in urgent need of improvement to improve production efficiency and product quality. Summary of the Invention

[0005] In order to improve the production efficiency and quality of automobile logo labels, the present application provides a method for preparing automobile logo labels.

[0006] A method for preparing a car logo plate comprises the following steps:

[0007] Milling: Process one side of the brand body to form a first convex surface, a second convex surface and a concave surface on its surface to obtain a milled part;

[0008] First anode: clean the milled part, then perform anodization to form a first color oxide film on the surface of the milled part, seal the pores, and obtain the first anode part;

[0009] First laser engraving: laser engraving is performed on all surfaces of the first anode component except the first convex surface, the second convex surface and the concave surface, and the first color oxide film formed thereon is completely removed to obtain the first laser engraved component;

[0010] Second laser engraving: laser engraving the second convex surface of the first laser engraved piece to form a dark color layer on the second convex surface to obtain a second laser engraved piece;

[0011] Second anode: Anodize the second laser engraved piece so that all surfaces of the second laser engraved piece except the concave surface and the first convex surface are coated with a second color oxide film, and the holes are sealed to obtain the car logo plate.

[0012] By adopting the above technical solution, efficient preparation of automobile logo labels is achieved, and the problems of complex and time-consuming ink filling and de-inking processes in the process are solved.

[0013] Specifically, milling: through precision processing of the brand body, the first convex surface, the second convex surface and the concave surface are formed, ensuring the precise implementation of subsequent steps and improving the appearance quality and consistency of the logo label.

[0014] First anode: The first color oxide film is formed by anodizing, so that the concave surface and the first convex surface are covered with the first color oxide film, and at the same time, it lays the foundation for subsequent laser engraving and secondary anodizing treatment.

[0015] First laser engraving: remove the first color oxide film on all surfaces except the first convex surface, the second convex surface and the concave surface, so that different parts of the logo can be processed with different colors, increasing the visual layering.

[0016] Second laser engraving: Laser engrave the second convex surface to deepen its color and reach the color level required by the customer, and highlight the color differences between the first convex surface, the second convex surface and the concave surface, making the color of the logo label brighter and more beautiful.

[0017] Second Anodic Oxidation: Through a second anodizing process, all surfaces except the concave and first convex surfaces are coated with a second-color oxide film, further enhancing the weather resistance and fade resistance of the vehicle's logo and label. This process also reduces the need for ink filling and de-inking, significantly shortening the production cycle and improving production efficiency and yield. Furthermore, it strengthens the protection of the second convex surface, reducing the risk of peeling. Since the first-color oxide film on the concave surface is not removed during this process, it remains unaffected by the second anodizing process. However, the second convex surface deepens its color further after the second anodizing process, further enhancing the distinctness of the first, second, and concave convex surfaces, and improving the aesthetics and quality of the vehicle's logo and label.

[0018] In summary, the present invention sequentially undergoes milling, first anode processing, first laser engraving, second laser engraving, and second anode processing, resulting in the formation of different colors on the first convex surface, second convex surface, and concave surface, making the color of the automobile logo more vivid. Furthermore, this process eliminates the need for repeated ink filling and de-inking, saving steps, improving production efficiency, avoiding impacts on the oxide layer, and increasing the yield rate of automobile logo production. Furthermore, it eliminates the need for processing through printing, transfer printing, and other processes, and exhibits excellent adhesion stability, reducing the possibility of shedding and wear, thereby achieving optimal quality and production efficiency for automobile logos.

[0019] Preferably, the first color layer is bright silver; and the second color layer is gray.

[0020] By adopting the above technical solution, the first color is bright silver and the second color is gray, creating distinct color layers on the signage and enhancing the visual effect. Furthermore, the combination of bright silver and gray not only enhances the overall aesthetics of the signage but also increases its recognizability. As the base color, bright silver maintains excellent reflectivity under varying lighting conditions, while gray better highlights the black of the second convex surface, giving the signage a more three-dimensional feel and texture. Furthermore, this color combination effectively avoids the color fading that can occur with traditional single-color signs during use, extending the lifespan of the signage.

[0021] Preferably, the milling step further comprises grinding the first convex surface and the second convex surface to make them flat, thereby obtaining a milled part.

[0022] By adopting the above technical solution, the first convex surface and the second convex surface are ground to make them flat, which can ensure the consistency and uniformity of the subsequent anodizing and laser engraving steps, avoid color unevenness and processing defects caused by surface unevenness, and improve the quality and appearance consistency of the final product.

[0023] Preferably, the second anode step further includes highlight processing the side and highlight angles of the second laser engraved part, and then performing anodizing to coat all surfaces of the second laser engraved part except the concave surface and the first convex surface with a second color oxide film, sealing the holes, and obtaining a car logo plate.

[0024] By employing this technical solution, the sides and highlight angles of the second laser engraved part are subjected to high-gloss finishing before anodizing. This results in a second-color oxide film coating all surfaces of the second laser engraved part, except for the concave surface and the first convex surface. The pores are then sealed, resulting in a vehicle logo plate. This process not only enhances the color depth of the second convex surface but also enhances the overall aesthetics and three-dimensionality of the logo plate, improving the product's visual impact. Furthermore, the high-gloss finishing increases the smoothness and flatness of the logo plate's surface, further improving its wear and corrosion resistance and extending its service life. Furthermore, this improvement avoids the complex ink filling and de-inking processes of traditional processes, simplifies the production process, and significantly improves production efficiency and yield.

[0025] Preferably, the specific process in the first anode step is: degreasing the milling part for 1-5 minutes, alkali-processing for 5-30 seconds, chemically polishing for 5-15 seconds, and then anodizing for 50-70 minutes to form a first color oxide film on the surface of the milling part, sealing the hole for 50-70 minutes to obtain the first anode part.

[0026] By adopting this technical solution, pretreatment steps such as degreasing, alkali treatment, and chemical polishing effectively remove grease, impurities, and minor flaws from the milled parts' surfaces, ensuring uniformity and consistency during the subsequent anodizing process. The subsequent anodizing step forms a first-color oxide film on the milled parts' surfaces within 50-70 minutes, improving its density and corrosion resistance. The sealing step further enhances the film's stability, preventing performance degradation caused by environmental factors during use. This entire process not only improves the product's surface quality and aesthetics, but also significantly increases production efficiency and yield.

[0027] Preferably, the second anodic step also includes a dyeing and degreasing process, and the specific process is as follows: the second laser engraved part is degreased for 1-5 minutes, and then anodized for 65-80 minutes, so that all surfaces of the second laser engraved part except the concave surface and the first convex surface are coated with a second color oxide film, and then dyed for 10-20 seconds, and sealed for 50-65 minutes to obtain the car logo plate.

[0028] By adopting the above technical solution, the oil stains on the surface of the second laser engraved part are first removed through the degreasing step, ensuring the uniformity and integrity of the oxide film during the subsequent anodizing process. Then, anodizing is carried out to coat all surfaces of the second laser engraved part except the concave surface and the first convex surface with a layer of second-color oxide film. This process not only improves the thickness and density of the oxide film, but also enhances the corrosion resistance and wear resistance of the oxide film. Subsequently, a dyeing step is carried out to make the color of the second-color oxide film more vivid and lasting, thereby improving the aesthetics of the logo and label. Finally, a sealing step is carried out to seal the micropores of the oxide film, further improving the protective performance and service life of the oxide film. The entire process reduces the ink filling and ink removal steps, improves production efficiency, reduces production costs, and at the same time ensures product quality and stability.

[0029] Preferably, the anodization in the second anode step uses an anodizing agent, and the anodizing agent is composed of the following weight percentages:

[0030] Potassium titanium oxalate 0.1-0.5%

[0031] Boric acid 0.01-0.03%

[0032] Oxalic acid 3-5.5%

[0033] Citric acid 0.5-0.8%

[0034] Zinc nitrate 1.5-3.2%

[0035] Sodium hexametaphosphate 0.01-0.03%

[0036] Activation accelerator 0.2-0.5%

[0037] The balance is water.

[0038] By adopting the above-mentioned technical solution, the effect and efficiency of anodizing can be significantly improved. Specifically, by using an anodizing agent with a specific ratio, a synergistic effect is generated between the components, which jointly promote the formation of an oxide film on the metal surface and the optimization of its properties. The addition of potassium titanium oxalate, boric acid, oxalic acid and citric acid improves the density and corrosion resistance of the oxide film, while enhancing the hardness and wear resistance of the oxide film. The addition of zinc nitrate and sodium hexametaphosphate further improves the uniformity and glossiness of the oxide film and enhances the overall performance of the oxide film. The use of an activation promoter accelerates the anodizing process, increases the formation rate of the oxide film, reduces the oxidation time, and thus improves production efficiency. In addition, the activation promoter also improves the adhesion and stability of the oxide film and reduces the risk of the oxide film falling off. In summary, this technical solution not only improves the production efficiency of automobile logo and labeling, but also ensures the stability and reliability of product quality.

[0039] Preferably, the activation accelerator is composed of the following raw materials in percentage by weight:

[0040] Tricarboxylic acid 59-68%

[0041] Zinc gluconate 12-25%

[0042] Zinc stearate 10-15%

[0043] Glutamic acid derivatives 5-10%.

[0044] By adopting the above-mentioned technical solution, the specific ratio of tricarboxylic acid, zinc gluconate, zinc stearate, and glutamic acid derivatives in the activation accelerator can significantly improve the formation rate and quality of the oxide film during the anodizing process. The tricarboxylic acid chemically reacts with the components of the metal oxide film, introducing new functional groups and improving the surface properties of the oxide film. Zinc gluconate has a corrosion inhibitory effect, improving the performance of the oxide film, promoting the anodic reaction, and enhancing the stability and environmental friendliness of the electrolyte. Zinc stearate optimizes the electrolyte performance, improves the film quality, and enhances the adhesion between the brand and the oxide film. The glutamic acid derivative further improves the wettability and dispersibility of the electrolyte, enhancing the efficiency and quality of anodizing. The synergistic effect of these components results in the final oxide film having better mechanical properties, corrosion resistance, and aesthetics, thereby improving the overall quality and service life of the automotive logo.

[0045] Preferably, the tricarboxylic acid is one or more of cyclohexane tricarboxylic acid, propylene tricarboxylic acid, and 1,2,3,4-butane tetracarboxylic acid.

[0046] By adopting the above technical solution and selecting one or more of cyclohexanetricarboxylic acid, propylenetricarboxylic acid, and 1,2,3,4-butanetetracarboxylic acid as tricarboxylic acids, the performance of the anodic oxidant can be effectively improved. These carboxylates chemically react or interact with the components in the metal oxide film during the anodic oxidation process, introducing new functional groups or changing the surface properties of the oxide film, thereby preparing a metal oxide film with special functions (such as hydrophilicity, hydrophobicity, biocompatibility, etc.). At the same time, they may also produce synergistic effects with other additives (such as inorganic salts, surfactants, corrosion inhibitors, etc.), further improving the efficiency and effect of anodic oxidation, so that the oxide film formed on the metal surface has better performance and a wider range of applications.

[0047] Preferably, the glutamate derivative is cocoyl glutamate and / or chitosan glutamate derivative.

[0048] By adopting the above technical solution and using cocoyl glutamic acid and / or chitosan glutamic acid derivatives as glutamic acid derivatives, the wettability and dispersibility of the electrolyte can be significantly improved, thereby enhancing the efficiency and quality of anodization. The emulsification, solubilization, and penetration abilities of cocoyl glutamic acid help clean the anode surface, removing impurities and oil stains, thereby facilitating the formation of an oxide film. The excellent adsorption properties of chitosan glutamic acid derivatives help remove impurities and oil stains from the electrolyte, reduce defects on the anode surface, and improve the quality and performance of the oxide film.

[0049] In summary, this application includes at least one of the following beneficial technical effects:

[0050] 1. Through multi-step processes such as milling, anodizing, and laser engraving, the first convex surface, second convex surface, and concave surface of the logo label are made to appear in different colors, effectively solving the problem of ink filling in the concave area in traditional processes, avoiding the inefficiency and errors caused by manual operations, and improving production efficiency;

[0051] 2. During the second anodizing process, a special anodizing agent and activation accelerator are used to significantly deepen the color of the second convex surface, achieving the black level required by the customer. This solves the problem of substandard color of the RS font in laser engraving in traditional processes and improves the visual effect and aesthetics of the product.

[0052] 3. The entire process does not require ink filling and ink removal processes, which reduces production steps, shortens production cycles, improves yield rates, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a structural diagram of the automobile identification plate of this application. DETAILED DESCRIPTION

[0054] The following is combined with Figure 1 The present application is further described in detail with reference to the accompanying drawings and examples.

[0055] Sources of some raw materials:

[0056] The anodizing solution in the first anode step includes 120 g / L sulfuric acid, 5 g / L LOP-10, 30 g / L silver ions, and water to volume;

[0057] Example 1-3: The anodizing solution in the second anode step includes 120 g / L sulfuric acid, 5 g / L LOP-10, 30 g / L zinc ions, and water to volume;

[0058] Sealing agent: Shengyuan YASY-707, diluted 5 times;

[0059] Degreaser: Shanghai Yinxi Industrial Co., Ltd., model FKES-284, diluted 10 times;

[0060] The alkali solution is a sodium carbonate solution with a mass fraction of 5%;

[0061] Polishing liquid: preferably from Wenzhou Aoyang Technology Co., Ltd., model OY-9C;

[0062] Zinc gluconate: molecular formula C12H22O14Zn, molecular weight: 455.69;

[0063] Cocoyl glutamate CAS: 210357-12-3;

[0064] Cyclohexanetrianoic acid CAS: 16526-68-4;

[0065] Chitosan glutamic acid derivative CAS: 84563-76-8.

[0066] Preparation example of anodizing agent

[0067] Preparation Example 1

[0068] An anodic oxidant is prepared by the following method:

[0069] According to weight percentage, 0.1% of potassium titanium oxalate, 0.03% of boric acid, 3% of oxalic acid, 0.8% of citric acid, 1.5% of zinc nitrate, 0.01% of sodium hexametaphosphate, 0.2% of activation promoter, and 94.36% of water were weighed and put into a stirring device. The mixture was stirred at a speed of 200 r / min for 10 minutes to fully mix the mixture to obtain an anode oxidizer.

[0070] In terms of weight percentage, the activation accelerator is obtained by uniformly mixing 68% of tricarboxylic acid, 12% of zinc gluconate, 10% of zinc stearate, and 10% of a glutamic acid derivative; wherein the tricarboxylic acid is cyclohexanetricarboxylic acid; and the glutamic acid derivative is cocoyl glutamic acid.

[0071] Preparation Example 2-3

[0072] Preparation Example 2-3 differs from Preparation Example 1 in that the amounts of raw materials used are different, as shown in Table 1.

[0073] Table 1 Amount of raw materials used in Preparation Examples 1-3 (%)

[0074]

[0075] Preparation Example 4

[0076] The difference between Preparation Example 4 and Preparation Example 2 is that the tricarboxylic acid is propylene tricarboxylic acid.

[0077] Preparation Example 5

[0078] The difference between Preparation Example 5 and Preparation Example 2 is that the tricarboxylic acid is 1,2,3,4-butanetetracarboxylic acid.

[0079] Preparation Example 6

[0080] Preparation Example 6 is different from Preparation Example 2 in that the tricarboxylic acid is composed of cyclohexane tricarboxylic acid, propylene tricarboxylic acid, and 1,2,3,4-butane tetracarboxylic acid in a weight ratio of 1:2:1.

[0081] Preparation Example 7

[0082] The difference between Preparation Example 7 and Preparation Example 2 is that the glutamic acid derivative is a chitosan glutamic acid derivative.

[0083] Preparation Example 8

[0084] Preparation Example 8 is different from Preparation Example 2 in that the glutamate derivative consists of cocoyl glutamate and chitosan glutamate derivative in a weight ratio of 1:0.7.

[0085] Preparation Example Comparative Example

[0086] Preparation Comparative Example 1

[0087] The difference between Preparation Comparative Example 1 and Preparation Example 1 is that the activation accelerator is replaced by citric acid in equal amounts.

[0088] Preparation Comparative Example 2

[0089] The difference between Preparation Comparative Example 2 and Preparation Example 1 is that an equal amount of zinc gluconate is replaced by tricarboxylic acid.

[0090] Preparation Comparative Example 3

[0091] The difference between Preparation Comparative Example 3 and Preparation Example 1 is that an equal amount of zinc stearate is replaced by tricarboxylic acid.

[0092] Preparation Comparative Example 4

[0093] The difference between Preparation Comparative Example 4 and Preparation Example 1 is that an equal amount of the glutamic acid derivative is replaced by a tricarboxylic acid.

[0094] Example

[0095] Example 1

[0096] A method for preparing a car logo plate comprises the following steps:

[0097] Milling: Use a milling machine to process one side of the 1050 aluminum plate to form a first convex surface, a second convex surface and a concave surface on its surface to obtain a milled part;

[0098] First anode: Place the milled part in a degreasing agent for degreasing for 3 minutes, then soak it in an alkaline solution for 20 seconds, then soak it in a polishing solution for chemical polishing for 10 seconds, then place it in a silver-containing anodizing solution electroplating tank and perform anodization for 60 minutes at a voltage of 14V to form a first color oxide film on the surface of the milled part, then place it in a sealing agent for soaking and sealing for 60 minutes, rinse it with clean water, and then air-dry the surface moisture to obtain the first anode part;

[0099] First laser engraving: Laser engraving is performed using a laser engraving machine with the following parameters: angle 90 degrees, line spacing 0.025 mm, speed 250 mm / s, power 19 W, and frequency 25 kHz. This removes the first color oxide film from all surfaces of the first anode component except the first convex surface, the second convex surface, and the concave surface, to obtain the first laser engraved component.

[0100] Second laser engraving: The second convex surface of the first laser engraved part is laser engraved again using a laser engraving machine. The laser engraving parameters are: angle 45 degrees, line spacing 0.02mm, speed 150mm / s, power 54W, frequency 110kHz, and laser engraving time 20s. The second convex surface is charred to form a dark color layer. This dark color layer is black, thus obtaining a second laser engraved part.

[0101] Second anode: put the second laser engraved piece into the degreasing agent and degrease for 2 minutes, then put the second laser engraved piece into the electroplating tank of the anodic oxidation solution and anodic oxidation for 70 minutes at a voltage of 13V, so that all surfaces of the second laser engraved piece except the concave surface and the first convex surface are plated with a second color oxide film, then put it into the sealing agent and immerse and seal for 60 minutes, rinse with clean water, and then air dry the surface moisture to obtain the car logo label. This car logo label can refer to Figure 1 , the first color layer is bright silver; the second color layer is gray, and the dark color layer is black.

[0102] The milling step also includes grinding the first convex surface and the second convex surface to make them flat to obtain a milled part.

[0103] The second anode step also includes highlight processing the side and highlight angles of the second laser engraved part, and then anodizing to coat all surfaces of the second laser engraved part except the concave surface and the first convex surface with a second color oxide film, and then placing it in a sealing agent for sealing for 60 minutes, rinsing it with clean water, and then air-drying the surface moisture to obtain the car logo label.

[0104] Example 2

[0105] The difference between Example 2 and Example 1 is that the process parameters are different; the details are as follows:

[0106] The laser engraving parameters in the first laser engraving step are line spacing 0.015mm, speed 200mm / s, power 17W, and frequency 23KHz; the laser engraving parameters in the second laser engraving step are line spacing 0.025mm, speed 100mm / s, power 50W, and frequency 120KHz.

[0107] In the first anode step: degreasing for 1 min, alkali treatment for 30 s, chemical polishing for 15 s, anodizing for 70 min, and sealing for 50 min.

[0108] In the second anode step: degreasing for 5 min, anodizing for 65 min, and sealing for 50 min.

[0109] Example 3

[0110] The difference between Example 3 and Example 1 is that the process parameters are different; the details are as follows:

[0111] The laser engraving parameters in the first laser engraving step are line spacing 0.015mm, speed 150mm / s, power 16W, and frequency 20KHz; the laser engraving parameters in the second laser engraving step are line spacing 0.015mm, speed 200mm / s, power 60W, and frequency 100KHz.

[0112] In the first anode step: degreasing for 5 minutes, alkali treatment for 5 seconds, chemical polishing for 5 seconds, anodizing for 50 minutes, and sealing for 70 minutes.

[0113] In the second anode step: degreasing for 1 min, anodizing for 80 min, and sealing for 50 min.

[0114] Examples 4-15

[0115] The difference between Example 4 and Example 1 is that the source of the anodic oxidant in the second anode step is different, as shown in Table 2:

[0116] Table 2 Sources of the anodic oxidant in the second anodic step of Examples 4-15

[0117]

[0118]

[0119] Example 16

[0120] The difference between Example 16 and Example 1 is that: the second laser engraved part is placed in a degreasing agent and degreased for 2 minutes, and then the second laser engraved part is placed in anodizing liquid and anodized for 70 minutes at a voltage of 13V, so that all surfaces of the second laser engraved part except the concave surface and the first convex surface are coated with a layer of second color oxide film, and then placed in a dye for immersion dyeing for 15 seconds, air-dried, and then placed in a sealing agent for immersion sealing for 60 minutes, rinsed with clean water, and then air-dried to obtain a car logo label.

[0121] The dyeing process is carried out as required to meet the diversity of product colors.

[0122] Comparative Example

[0123] Comparative Example 1

[0124] The difference between Comparative Example 1 and Example 1 is that the second convex surface is processed into black by coating, specifically as follows:

[0125] The milling process and the first anode process remain unchanged;

[0126] Black ink was applied to the second convex surface of the first anode member and UV cured for 2 minutes to obtain a black second convex surface. German Göhler T300 N50 black ink was used.

[0127] Comparative Example 2

[0128] The difference between Comparative Example 2 and Example 1 is that a thermal transfer method is used to process the second black convex surface. The specific process is as follows:

[0129] The milling process remains unchanged; the milled part is degreased for 3 minutes, immersed in alkaline solution for 20 seconds, immersed in polishing liquid, chemically polished for 10 seconds, and then placed in a silver-containing anodizing solution electroplating tank for 60 minutes. The voltage is 14V to form a first color oxide film on the surface of the milled part, clean it, and air-dry it to obtain a first anode part; then a transfer film containing a black pattern is attached to the second convex surface of the first anode, and when the vacuum meter shows a vacuum of -0.1MPa, it is heated to 180℃ for 250s to transfer the black pattern to the second convex surface, and then placed in a sealing agent for immersion and sealing for 60 minutes. It is rinsed with clean water, and then the surface moisture is air-dried to obtain a black second convex surface.

[0130] The transfer film with a black pattern is prepared by the following method: spraying German Göhler T300 N50 black ink on a thermal transfer film, and curing the ink to obtain a transfer film with a black pattern.

[0131] Performance testing

[0132] Colorimetry: The automobile identification plates obtained in Examples 1-16 and Comparative Examples 1-2 were tested using a colorimeter to compare the colors on the first convex surface, the second convex surface, and the concave surface with the colors on the sample. If the color difference values ​​were all less than 0.5, it was considered qualified; if they were greater than 0.5, it was considered unqualified.

[0133] Adhesion stability: The dark color layer obtained in the second anodic step was tested using the falling sand test method according to ASTM D968-09, and the amount of coating that caused bottom see-through was recorded.

[0134] The specific data of the above data are shown in Table 3;

[0135] Table 3 Examples 1-15 and Comparative Examples 1-2

[0136] Example Pass rate (%) Dosage for bottom penetration (L) Example 1 90 33 Example 2 88 30 Example 3 87 31 Example 4 99 55 Example 5 100 57 Example 6 99 56 Example 7 99 57 Example 8 100 56 Example 9 100 60 Example 10 100 60 Example 11 100 63 Example 12 93 45 Example 13 93 48 Example 14 94 50 Example 15 95 51 Comparative Example 1 88 13 Comparative Example 2 81 21

[0137] Combining Example 1 with Comparative Examples 1-2 and Table 3, it can be seen that the present process improves the adhesion stability of the dark color layer, surpassing the coating and thermal transfer methods in Comparative Examples 1-2, and also provides a higher product pass rate. This demonstrates that the present process achieves higher product quality.

[0138] Combining Example 1, Example 4, Examples 12-15 and Table 3, it can be seen that the qualified rate and the bottom transparent dosage of Examples 1 and Examples 12-15 are lower than the qualified rate and the bottom transparent dosage of Example 4, indicating that the present application uses tricarboxylic acid, zinc gluconate, zinc stearate, and glutamic acid derivatives as activation promoters, and combines potassium titanium oxalate, boric acid, oxalic acid, citric acid, zinc nitrate, sodium hexametaphosphate, etc. to obtain an anodic oxidant. During the anodic oxidation process, a stable oxide film is easily formed on the surface of the second convex layer, and the process can protect the dark color layer and prevent it from falling off, thereby achieving better results.

[0139] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for preparing a car logo plate, characterized in that: The following steps are involved: Milling: Process one side of the brand body to form a first convex surface, a second convex surface and a concave surface on its surface to obtain a milled part; First anode: clean the milled part, then perform anodization to form a first color oxide film on the surface of the milled part, seal the pores, and obtain the first anode part; First laser engraving: laser engraving is performed on all surfaces of the first anode component except the first convex surface, the second convex surface and the concave surface, and the first color oxide film formed thereon is completely removed to obtain the first laser engraved component; Second laser engraving: laser engraving the second convex surface of the first laser engraved piece to form a dark color layer on the second convex surface to obtain a second laser engraved piece; Second anode: anodize the second laser engraved piece, so that all surfaces of the second laser engraved piece except the concave surface and the first convex surface are coated with a second color oxide film, and the holes are sealed to obtain the car logo plate; The anodization in the second anode step uses an anodizing agent, and the anodizing agent is composed of the following weight percentages: Potassium titanium oxalate 0.1-0.5% Boric acid 0.01-0.03% Oxalic acid 3-5.5% Citric acid 0.5-0.8% Zinc nitrate 1.5-3.2% Sodium hexametaphosphate 0.01-0.03% Activation accelerator 0.2-0.5% The balance is water; The activation accelerator is composed of the following raw materials in percentage by weight: Tricarboxylic acid 59-68% Zinc gluconate 12-25% Zinc stearate 10-15% Glutamic acid derivatives 5-10%.

2. The method for preparing a car identification plate according to claim 1, characterized in that: The laser engraving parameters in the first laser engraving step are: angle 90 degrees, line spacing 0.015-0.035 mm, speed 150-250 mm / s, power 16-19 W, frequency 20-25 kHz; the laser engraving parameters in the second laser engraving step are: angle 45 degrees, line spacing 0.015-0.025 mm, speed 100-200 mm / s, power 50-60 W, frequency 100-120 kHz.

3. The method for preparing a car identification plate according to claim 1, characterized in that: The milling step further includes grinding the first convex surface and the second convex surface to make them flat to obtain a milled part.

4. The method for preparing a car identification plate according to claim 1, characterized in that: The second anode step also includes highlight processing the side and highlight angles of the second laser engraved piece, and then performing anodizing to coat all surfaces of the second laser engraved piece except the concave surface and the first convex surface with a second color oxide film, sealing the holes, and obtaining a car logo plate.

5. The method for preparing a car identification plate according to claim 1, characterized in that: The specific process of the first anode step is: degreasing the milled part for 1-5 minutes, alkali-processing for 5-30 seconds, chemically polishing for 5-15 seconds, and then anodizing for 50-70 minutes to form a first color oxide film on the surface of the milled part, sealing the pores for 50-70 minutes to obtain the first anode part.

6. The method for preparing a car identification plate according to claim 1, characterized in that: The second anodic step also includes a dyeing and degreasing process. The specific process is as follows: the second laser engraved part is degreased for 1-5 minutes, and then anodized for 65-80 minutes to coat all surfaces of the second laser engraved part except the concave surface and the first convex surface with a second color oxide film, and then dyed for 10-20 seconds and sealed for 50-65 minutes to obtain the car logo plate.

7. The method for preparing a car identification plate according to claim 1, characterized in that: The tricarboxylic acid is one or more of cyclohexane tricarboxylic acid, propylene tricarboxylic acid, and 1,2,3,4-butane tetracarboxylic acid.

8. The method for preparing a car identification plate according to claim 1, characterized in that: The glutamic acid derivative is cocoyl glutamic acid and / or chitosan glutamic acid derivative.

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