Pearl etching-based composite surface treatment method

Abstract

The present invention relates to a pearl corrosion composite surface treatment method (1) in which the mold of a product is corroded through a specific process so that the surface of the product exhibits a pearl texture effect. In detail, In the pearl corrosion composite surface treatment method (1), By corroding the mold using amorphous abrasives, It is characterized by ensuring that the surface of the product is treated with a pearl texture. Accordingly, the present invention, as described above, By manufacturing a mold to treat the surface of the product with a pearl texture, The durability of the product resulting from the pearl etching surface treatment, as well as the realization of a natural and luxurious pearl effect, has the advantage of maximizing the visual depth of the product and ensuring stable productivity of such products.

Description

Technology Field

[0001] The present invention relates to a pearl corrosion composite surface treatment method, and more specifically, to a pearl corrosion composite surface treatment method that promotes the premiumization of a product by adding aesthetic elements as well as durability by corroding a mold through a specific process using an amorphous abrasive to form a pearl texture on the surface of an injection-molded product. Background Technology

[0002] Various surface treatment technologies have been used since the past to impart decorative properties, anti-slip properties, optical texture, or adhesion of subsequent coatings to the surface of metal materials.

[0003] Surface treatment technology that imparts a specific texture, gloss, or pattern to the surface in order to improve the appearance quality and functionality of such metal products is

[0004] It is widely used in various industrial fields, such as automotive interior and exterior materials, home appliance exteriors, industrial molds, and architectural metal panels.

[0005] In particular, recently, there has been an increasing demand for pearl textures on metal surfaces—that is, surface textures that have a subtle reflectivity and depth formed by fine particles—in order to achieve a luxurious appearance.

[0006] Conventionally, surface treatment methods for implementing a pearl texture in a product include:

[0007] First, by painting or coating,

[0008] A method of imparting a pearl effect to a surface by spraying or applying a paint, clear coating, or resin-based coating agent containing pearl pigment or metallic particles after polishing or cleaning a metal surface, and

[0009] Second, by a single etching method,

[0010] A method of creating a pearl texture by directly etching a metal surface using a chemical etchant to form fine irregularities, thereby inducing diffuse reflection of light, and

[0011] Third, by a simple corrosion method after mechanical surface treatment,

[0012] There is a method of performing chemical corrosion after a sandblasting or simple grinding process.

[0013] However, the above-mentioned conventional painting or coating methods are,

[0014] Although it has the advantage of being relatively easy to implement, since the pearl texture is artificially formed by the coating layer rather than being formed from the surface structure of the product itself, it is susceptible to scratches and wear, and problems such as peeling, discoloration, and reduced uniformity occur with long-term use, and

[0015] The single etching method is,

[0016] There are limitations in that corrosion conditions (corrosion solution composition, temperature, time, etc.) are applied simply or uniformly, resulting in low reproducibility of surface texture and difficulty in controlling corrosion depth and roughness.

[0017] In particular, problems with deterioration in appearance quality due to localized over-corrosion or uneven corrosion frequently occur, and

[0018] The simple corrosion (etching) method is,

[0019] As mechanical treatment and chemical etching are not organically combined and are performed independently, there is a problem in that fine control of the surface texture is difficult and the depth or three-dimensionality of the pearl texture is limited.

[0020] In other words, conventional surface treatment technologies for producing a pearl texture are,

[0021] Pearl textures depend on the coating layer or are formed by simple corrosion, resulting in low durability and susceptibility to wear. It is difficult to precisely control surface roughness, texture, and gloss, leading to large quality variations between products. It is also difficult to achieve complex textures (matte, semi-gloss, glossy, pearl textures) within a single process, and it is difficult to simultaneously secure functional performance such as reduced surface friction coefficient, wear resistance, and corrosion resistance.

[0022] In addition, there are limitations and problems that are continuously raised, such as increased number of processes, increased costs, and increased environmental burden, as the process conditions have low repeatability and are unsuitable for mass production, and in particular, in the field, coating or application is often repeatedly applied as a post-process to secure a pearl texture.

[0023] Therefore, there is an increasing demand for a new type of pearl etching-based composite surface treatment technology that can achieve a pearl texture by controlling the microstructure of the product surface itself, rather than conventional simple coating or single, simple etching methods, while simultaneously reducing surface friction, wear resistance, and appearance quality.

[0024] Therefore, the present invention,

[0025] We aim to provide a new surface treatment method that can fundamentally improve the limitations of conventional technology by corroding the mold through a specific process so that a pearl texture is formed on the surface structure of the product itself, rather than a surface treatment method for the product.

[0026] That is, by consulting with the customer in advance regarding the surface treatment results of the final product (e.g., the degree of pearl texture effect treatment on a glossy, semi-gloss, or matte base), and by controlling complex processes such as mold cleaning, drying, polishing, and pearl etching in stages to match the concept of the product to be launched according to the customer's request,

[0027] We aim to provide a pearl etching composite surface treatment method that can simultaneously satisfy a uniform pearl texture, stable surface roughness, and excellent suitability for subsequent processes.

[0028] Accordingly, as prior art regarding a pearl corrosion composite surface treatment method,

[0029] As shown in FIG. 12(a),

[0030] The "Surface treatment method for an injection molding die and an injection molding die according thereto" of Korean Registered Patent Publication No. 10-2163809 (hereinafter referred to as "Prior Art 1"),

[0031] The present invention relates to a surface treatment method for an injection molding mold and an injection molding mold according thereto, wherein a coating film having a thickness of 1 to 10 μm is formed by applying a thin film coating to the cavity surface or the cavity surface and core surface of a plastic injection molding mold having a predetermined embossing pattern, and by drying and curing, a coating film having a thickness of 1 to 10 μm is formed by applying a coating film consisting of a mixture of an organic-inorganic composite silicone synthetic resin obtained by low-temperature polymerizing a water-soluble acrylic and urethane prepolymer to an inorganic heat-resistant resin obtained by low-temperature polymerizing a water-soluble polysiloxane and an inorganic silica sol, and carbon powder as a filler, thereby significantly reducing surface defects such as stains, gas marks, flow marks, weld lines, and sink marks on the surface of a plastic molded product that may occur during the injection molding process, and also having the advantage of reducing the number of secondary processing steps such as painting or plating, or obtaining an injection molded product with excellent surface quality without such secondary processing.

[0032] Another prior art is,

[0033] As shown in Fig. 12(b),

[0034] According to the "Method for surface treatment of a mold for forming a hairline pattern" of Korean Registered Patent Publication No. 10-2639810 (hereinafter referred to as 'Prior Art 2'),

[0035] A step of manufacturing a hairline film by printing a hairline design on a film; a step of performing a first masking by attaching a masking film to the mold surface excluding the surface to be processed; a step of forming a surface of uniform roughness by pre-treating the mold surface to be processed using the first masked mold; a step of preheating the pre-treated mold at a temperature of 58 to 62°C for 28 to 32 minutes; a step of forming an acid-resistant film by applying a photosensitive liquid to the preheated mold; a step of removing the masking film from the mold with the acid-resistant film formed and drying; a step of performing a second masking by attaching a hairline film to the surface to be processed among the surfaces of the dried mold; a step of exposing the second masked mold; a step of developing the exposed mold; a step of performing a third masking by attaching a masking film to the surface to be processed among the surfaces of the developed mold excluding the surface to be processed; and a step of etching the third masked mold using an etching solution. The present invention relates to a mold surface treatment method for forming a hairline pattern, comprising the step of removing a masking film, a hairline film, and an acid-resistant film from a mold that has been etched.

[0036] As examined above, prior art 1 and prior art 2 are technical fields similar to the present invention, and while similar and identical technical concepts exist in the basic components of the invention, there are differences in the specific means of solving them, the problems to be solved, and the effects of the invention through them.

[0037] That is, Prior Art 1 is,

[0038] The present invention provides a surface treatment method for an injection molding mold and an injection molding mold according thereto, which enables the production of a plastic molded product having excellent appearance quality by coating a thin film of organic-inorganic composite silicone resin after embossing the core surface and / or cavity surface of the injection molding mold into a three-dimensional shape.

[0039] Prior art 2 is,

[0040] The present invention provides a mold surface treatment method that enables the easy formation of a hairline pattern during injection and excellent wear resistance of the mold surface, thereby allowing for repetitive injection molding.

[0041] Compared to the present invention,

[0042] There are differences in the technical characteristics of the specific means of solution (components) of the invention for solving the problem that the invention aims to solve and producing the desired effect.

[0043] Therefore, the present invention aims to achieve its technical features based on the problem to be solved (object of the invention) unique to the present invention, the means to solve the problem (components) and the effect achieved by solving the problem, which is different from the conventional mold surface treatment technology including prior art 1 and prior art 2. Prior art literature

[0044] (Reference 1) Korean Patent Publication No. 10-2163809 (Registered Oct. 02, 2020) (Reference 2) Korean Patent Publication No. 10-2639810 (Registered Feb. 19, 2024) The problem to be solved

[0045] Accordingly, the present invention has been devised to solve the aforementioned conventional problems, and

[0046] The purpose is to provide a pearl etching composite surface treatment method that can precisely control the roughness of the product surface and ensure uniformity and reproducibility of the pearl texture.

[0047] That is, the purpose is to provide a pearl etching composite surface treatment method that ensures stable product uniformity, reproducibility, and productivity, and promotes a beautiful appearance of the product by providing a mold that can treat the surface of the product to produce a pearl texture on a glossy, semi-glossy, or matte base according to customer requests and consultations and the concept of the product to be launched. means of solving the problem

[0048] The present invention for achieving the above purpose has been devised to achieve the problem to be solved, and

[0049] In a pearl corrosion composite surface treatment method,

[0050] By corroding the mold using amorphous abrasives,

[0051] It is characterized by ensuring that the surface of the product is treated with a pearl texture.

[0052] At this time, the pearl etching composite surface treatment method is,

[0053] Pearl etching preparation stage, which involves performing base work on a mold for proceeding with pearl etching;

[0054] The method comprises a pearl etching step for pearl etching a mold in which the base work is completed in the above pearl etching preparation step;

[0055] The above pearl etching step is,

[0056] A second mold cleaning step for cleaning the mold in which the base work is completed in the above pearl corrosion preparation step;

[0057] A second mold drying step for drying the mold cleaned in the above second mold cleaning step;

[0058] A second masking step in which the area where the first corrosion work is completed and the protection area are distinguished using dedicated tape in the above pearl corrosion preparation step;

[0059] It consists of a second corrosion step in which a second corrosion process is performed using an amorphous abrasive to express a pearl texture on the surface of the product,

[0060] By sequentially etching the mold through the above process so that the surface of the product is treated with a pearl texture,

[0061] Manufactures a mold for pearl corrosion of the product.

[0062] In addition, the pearl corrosion composite surface treatment method includes,

[0063] A ceramic coating step for improving the durability of the mold is further included and configured,

[0064] It is characterized by protecting the mold and injection molded product from scratches, etc., and ensuring a consistent and uniform surface treatment of the product.

[0065] Meanwhile, prior to this, terms or words used in the claims of this specification should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor may appropriately define the concept of the terms to best describe his invention.

[0066] Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and that various equivalents and modifications that can replace them may exist at the time of filing this application. Effects of the invention

[0067] As described above in the composition and operation above, according to the present invention,

[0068] 1. To ensure precise control and uniformity of surface roughness, and

[0069] 2. It can simultaneously realize fine pearl textures and effects such as gloss, semi-gloss, and matte, and

[0070] 3. Improvement of appearance quality and durability is achieved, which is different from conventional surface treatment methods for producing a pearl texture.

[0071] 4. In addition, uniformity, durability, functionality, and process reproducibility of the pearl texture are ensured.

[0072] That is, the present invention is,

[0073] According to the concept of the final product, in consultation with the customer, the mold for injection molding the final product is pearl-etched, making it possible to apply a pearl texture surface treatment to a glossy, semi-glossy, or matte base. This is a very effective invention. Brief explanation of the drawing

[0074] FIG. 1 is a block diagram of the pearl corrosion composite surface treatment method of the present invention. FIG. 2 shows a detailed block diagram of the pearl corrosion step in the pearl corrosion composite surface treatment method of the present invention. FIG. 3 illustrates an example of an amorphous abrasive used in the pearl corrosion step of the pearl corrosion composite surface treatment method of the present invention. Figure 4 shows a partial enlarged view of Figure 3. Figure 5 shows a partial enlarged view of Figure 3. FIG. 6 illustrates a surface-treated sample manufactured using the pearl corrosion composite surface treatment method of the present invention. Figure 7 shows a partial enlarged view of Figure 6. Figure 8 shows a partial enlarged view of Figure 6. Figure 9 shows a partial enlarged view of Figure 6. Figure 10 shows a partial enlarged view of Figure 6. Figure 11 shows a partial enlarged view of Figure 6. FIG. 12 is a representative diagram of the prior art for the pearl corrosion composite surface treatment method of the present invention. Specific details for implementing the invention

[0075] Hereinafter, with reference to the attached drawings, the function, configuration, and operation of the present invention’s pearl corrosion composite surface treatment method (1) will be described in detail.

[0076] FIG. 1 is a block diagram of the pearl corrosion composite surface treatment method of the present invention, FIG. 2 is a detailed block diagram of the pearl corrosion step of the pearl corrosion composite surface treatment method of the present invention, and FIG. 3 is an example of an amorphous abrasive used in the pearl corrosion step of the pearl corrosion composite surface treatment method of the present invention.

[0077] FIGS. 4 to 5 are partial enlarged views of FIG. 3, FIG. 6 is a surface-treated sample manufactured through the pearl corrosion composite surface treatment method of the present invention, and FIGS. 7 to 11 are partial enlarged views of FIG. 6.

[0078] As illustrated in FIGS. 1 to 11, the present invention,

[0079] In the pearl corrosion composite surface treatment method (1),

[0080] By corroding the mold using amorphous abrasives,

[0081] It is characterized by ensuring that the surface of the product is treated with a pearl texture.

[0082] That is, the present invention is,

[0083] As mentioned above,

[0084] This relates to a pearl corrosion composite surface treatment method (1) of a mold that produces a pearl texture surface treatment effect on the product.

[0085] In more detail,

[0086] The pearl corrosion composite surface treatment method (1) is,

[0087] Pearl etching preparation step (S100) for performing base work on a mold to proceed with pearl etching;

[0088] The method comprises a pearl etching step (S200) for pearl etching the mold on which the base work is completed in the above pearl etching preparation step (S100);

[0089] The above pearl etching step (S200) is,

[0090] A second mold cleaning step (S210) for cleaning the mold after the base work is completed in the above pearl corrosion preparation step (S100);

[0091] A second mold drying step (S220) for drying the mold cleaned in the second mold cleaning step (S210) above;

[0092] A second masking step (S230) in which the area where the first corrosion work is completed and the protected area are distinguished using a dedicated tape in the above pearl corrosion preparation step (S100);

[0093] It consists of a second corrosion step (S240) in which a second corrosion operation is performed using an amorphous abrasive so as to express a pearl texture on the surface of the product,

[0094] By sequentially etching the mold through the above process so that the surface of the product is treated with a pearl texture,

[0095] It is characterized by manufacturing a mold for pearl corrosion of the product.

[0096] If we examine the above-mentioned pearl etching preparation step (S100) and pearl etching step (S200) in more detail,

[0097] The above Pearl etching preparation step (S100) Is,

[0098] A first mold cleaning step (S110) for removing contaminants and residues from the surface of the mold;

[0099] A first mold drying step (S120) for drying the cleaned mold;

[0100] A first masking step (S130) for distinguishing the area to be treated with first corrosion and the protection area using dedicated tape to create the base of the second corrosion step (S240);

[0101] A first corrosion step (S140) in which a first corrosion operation is performed to create a base for a second corrosion step (S240);

[0102] After the completion of the first corrosion step (S140) above, the method comprises a first masking removal step (S150) for removing the masked tape;

[0103] The above first corrosion step (S140) is,

[0104] Based on customer requests and consultations, and the concept of the product to be launched,

[0105] Select one of sandblasting, chemical etching, or pattern surface treatment to perform the primary corrosion operation.

[0106] That is, prior to the secondary corrosion process, the pearl corrosion process, by selectively performing at least one of sandblasting, chemical etching, or patterned surface treatment,

[0107] By homogenizing the roughness and reactivity of the metal surface and minimizing reaction deviations in the subsequent pearl etching process, it is possible to stably realize a pearl texture with excellent visual depth and high reproducibility.

[0108] For example, due to primary corrosion,

[0109] If sandblasting is performed,

[0110] By promoting uniformity of surface irregularities and ensuring that pearl corrosion acts evenly, stains and deviations are reduced, preventing localized over-corrosion and under-corrosion of the pearl corrosion reaction, and increasing the clarity of the pearl texture, it becomes easier to realize visual depth and high-quality texture.

[0111] In other words, it offers a uniform pearl texture, improved appearance quality, and excellent reproducibility.

[0112] In addition, if chemical etching is performed,

[0113] By removing the oxide layer on the surface, it is possible to achieve finer roughness control than sandblasting.

[0114] In other words, fine control of semi-gloss and matte areas is possible, as well as silk-like pearl textures, making it easy to control pearl etch textures based on fine roughness.

[0115] This allows for precise control of depth and illumination, and enables the expression of fine patterns.

[0116] In addition, if the pattern method is used,

[0117] By allowing the pearl corrosion to react differently depending on the depth, angle, and area of ​​the pattern, so that the pattern remains intact and the whole forms a pearl texture, a composite surface with a pearl texture can be realized without damaging the pattern.

[0118] In other words, it is possible to maximize design freedom, visual three-dimensionality, and realize a premium appearance.

[0119] The above Pearl etching step (S200) Is,

[0120] A second mold cleaning step (S210) for cleaning the mold after the base work is completed in the above pearl corrosion preparation step (S100);

[0121] A second mold drying step (S220) for drying the mold cleaned in the second mold cleaning step (S210) above;

[0122] A second masking step (S230) in which the area where the first corrosion work is completed and the protected area are distinguished using a dedicated tape in the above pearl corrosion preparation step (S100);

[0123] It comprises a second corrosion step (S240) in which a second corrosion operation is performed using an amorphous abrasive so as to express a pearl texture on the surface of the product, wherein

[0124] The second corrosion stage (S240) is,

[0125] A glossy base treatment step (S241) of spraying spherical glass beads of silicon dioxide at a constant pressure to make the surface glossy;

[0126] A semi-gloss base treatment step (S242) in which spherical glass beads of silicon dioxide and diamond abrasives are mixed in a certain weight ratio and then sprayed at a certain pressure to semi-gloss the surface;

[0127] A first matte base treatment step (S243) of matte-treating the surface by spraying silicon carbide formed with a specific range of inlets at a constant pressure;

[0128] A second matte base treatment step (S244) in which green silicon carbide is sprayed at a constant pressure to matte the surface;

[0129] A third matte base treatment step (S245) in which finely powdered alumina oxide is sprayed at a constant pressure to matte the surface;

[0130] A first friction-reducing corrosion step (S246) for forming a fine and uniform uneven structure on the surface by spraying an abrasive containing fine chromium and nickel at a constant pressure, and simultaneously reducing the actual contact area and improving sliding properties;

[0131] A second friction-reducing corrosion step (S247) for reducing the surface friction coefficient by spraying artificial graphite having fine particle size to cause corrosion in the form of fine peeling on the surface, thereby forming a fine and uniform uneven surface structure;

[0132] It is composed of an amorphous abrasive corrosion step (S248) in which amorphous silicon dioxide is sprayed at a constant pressure to treat the surface, and

[0133] The above glossy base treatment step (S241), semi-glossy base treatment step (S242), first matte base treatment step (S243), second matte base treatment step (S244), and third matte base treatment step (S245) are,

[0134] Based on customer requests and consultations, and the concept of the product to be launched, one option is selected and proceeded with.

[0135] By ensuring that the first friction-reducing corrosion step (S246), the second friction-reducing corrosion step (S247), and the irregular abrasive corrosion step (S248) proceed sequentially,

[0136] Ensure that a process for pearl corrosion is carried out.

[0137] At this time, the amorphous silicon dioxide used in the amorphous abrasive corrosion step (S248) is,

[0138] In response to the situation,

[0139] Amorphous silicon dioxide of 0.1 to 0.4 mm or, 0.35 to 0.85 mm or, or 1.0 mm or more is etched in a percentage relative to the area to achieve a pearl texture,

[0140] Finally, the surface of the injection-molded product is treated with a pearl texture.

[0141] In addition, the first friction-reducing corrosion step (S246) and the second friction-reducing corrosion step (S247) are,

[0142] A step that not merely roughens the surface, but simultaneously forms a fine sliding structure and a corrosion stability layer.

[0143] It forms micro-irregularities in a directional rather than random manner, reduces the surface contact area, and lowers the coefficient of friction.

[0144] This is directly linked to the effects of improved mold release, reduced wear, prevention of contamination adhesion, and increased reusability.

[0145] That is, the present invention is,

[0146] By using general equipment prepared at the site, such as a drying machine (100), a sanding blast machine (200), a chemical etching machine (300), a pattern processing machine (400), and a pearl etching machine (500), and etching the mold according to each stage,

[0147] The surface of the final product injection-molded through the etched mold is treated with a pearl texture.

[0148] Meanwhile, the pearl corrosion composite surface treatment method (1) of the present invention,

[0149] In the second corrosion process carried out through the pearl corrosion step (S200), a ceramic coating step (S300) is further included and configured to improve the durability of the mold by coating the surface where the second corrosion process is carried out with ceramic.

[0150] It is characterized by protecting the mold and injection molded product from scratches, etc., and ensuring a consistent and uniform surface treatment of the product.

[0151] The ceramic coating step (S300) above is,

[0152] During the process of the pearl corrosion step (S200), the process is carried out after the completion of the second corrosion step (S240) to ensure the durability of the mold.

[0153] For example, the ceramic coating step (S300) is,

[0154] The surface temperature of the surface to be coated with ceramic is maintained at 50 to 60°C, and

[0155] By spraying or immersion,

[0156] For spraying, use a low-pressure spray gun to spray evenly onto the surface.

[0157] At this time, the spray pressure is 1 to 2 bar, the spray distance is 15 to 20 cm, and the application amount is 10 to 15 ml / m² 2 Do as,

[0158] After spraying, wait for about 3 to 5 minutes for surface fusion, then dry the surface in a hot air dryer at 70 to 75°C for about 10 to 15 minutes.

[0159] Afterwards, for internal drying, place in an oven and bake, starting at a temperature of 90 to 95°C and gradually increasing the temperature over time to 180 to 200°C (e.g., 1.5 to 2 hours at 90°C, 1 hour at 120°C, and 0.5 to 1 hour at 150°C).

[0160] After heat treatment, let it cool slowly in the oven, then leave it at room temperature for at least 24 hours.

[0161] In addition, the degree of gloss can be controlled by mixing a photosensitizer during ceramic coating.

[0162] As described above, it is obvious to those skilled in the art that the present invention is not limited to the described embodiments and can be modified and varied in various ways without departing from the spirit and scope of the invention.

[0163] Accordingly, since the invention can be implemented in various other forms without departing from the technical concept or main features, the embodiments of the invention are merely examples in all respects and should not be interpreted restrictively, and can be implemented with various modifications. Industrial applicability

[0164] The present invention relates to a pearl corrosion composite surface treatment method, wherein

[0165] Starting with the mold etching industry for expressing pearl textures in products, it can be applied to contribute to the advancement of various industrial fields related to product surface treatment, such as interior and exterior materials for various items requiring pearl texture surface treatment, especially architectural and interior panels, automobiles, home appliances, and cosmetic containers. Explanation of the symbols

[0166] 1: Pearl Etching Composite Surface Treatment Method 100: Drying machine 200: Sanding blast machine 300: Chemical etching machine 400: Pattern processing machine 500: Pearl etching machine S100: Pearl etching preparation step S110: First mold cleaning step S120: 1st mold drying step S130: 1st masking step S140: 1st corrosion step S150: 1st masking removal step S200: Pearl etching step S210: Second mold cleaning step S220: Second mold drying stage S230: Second masking stage S240: Second corrosion step S241: Glossy base treatment step S242: Semi-gloss base treatment step S243: First matte base treatment step S244: 2nd matte base treatment step S245: 3rd matte base treatment step S246: 1st friction-reducing corrosion stage S247: 2nd friction-reducing corrosion stage S248: Atypical abrasive corrosion stage S300: Ceramic coating step

Claims

Claim 1 A pearl corrosion composite surface treatment method (1) comprises: a pearl corrosion preparation step (S100) in which a base work is performed on a mold to proceed with pearl corrosion, so that the surface of the product is treated with a pearl texture by corroding the mold using an amorphous abrasive; and a pearl corrosion step (S200) in which the mold, on which the base work is completed in the pearl corrosion preparation step (S100), is subjected to pearl corrosion. The pearl corrosion step (S200) comprises: a second mold cleaning step (S210) in which the mold, on which the base work is completed in the pearl corrosion preparation step (S100), is cleaned; a second mold drying step (S220) in which the mold cleaned in the second mold cleaning step (S210) is dried; a second masking step (S230) in which the area where the first corrosion work is completed in the pearl corrosion preparation step (S100) and the protection area are separated using a dedicated tape; and on the surface of the product A second etching step (S240) is performed using an irregular abrasive to express a pearl texture; thereby producing a mold for pearl etching of a product by sequentially etching the mold through a second mold cleaning step (S210), a second mold drying step (S220), a second masking step (S230), and a second etching step (S240) so that the surface of the product is treated with a pearl texture, wherein the second etching step (S240) comprises: a glossy base treatment step (S241) that treats the surface to a glossy finish by spraying spherical glass bead silicon dioxide at a certain pressure; a semi-gloss base treatment step (S242) that treats the surface to a semi-gloss finish by mixing spherical glass bead silicon dioxide and abrasives in a certain weight ratio and spraying at a certain pressure; and silicon formed with a specific range of particles A first matte base treatment step (S243) of matte-treating the surface by spraying carbide at a constant pressure; a second matte base treatment step (S244) of matte-treating the surface by spraying green silicon carbide at a constant pressure; and a third matte base treatment step (S245) of matte-treating the surface by spraying finely oxidized alumina at a constant pressure;The method comprises: a first friction-reducing corrosion step (S246) for forming a fine and uniform uneven structure on the surface by spraying an abrasive containing fine chromium and nickel at a constant pressure, reducing the actual contact area, and improving sliding properties; a second friction-reducing corrosion step (S247) for forming a fine and uniform uneven structure on the surface by spraying artificial graphite with fine particle size to cause corrosion in the form of fine peeling on the surface, and reducing the surface friction coefficient; and an amorphous abrasive corrosion step (S248) for treating the surface by spraying amorphous silicon dioxide at a constant pressure; wherein the gloss base treatment step (S241), semi-gloss base treatment step (S242), first matte base treatment step (S243), second matte base treatment step (S244), and third matte base treatment step (S245) are selected and performed according to the customer's request and consultation, and the concept of the product to be released. A pearl corrosion composite surface treatment method characterized by allowing the first friction-reducing corrosion step (S246), the second friction-reducing corrosion step (S247), and the irregular abrasive corrosion step (S248) to proceed sequentially so that a process for pearl corrosion is carried out, and further including and configuring a ceramic coating step (S300) for improving the durability of the mold, thereby protecting the mold and the injection-molded product from scratches and ensuring a consistent and uniform surface treatment of the product. Claim 2 delete Claim 3 delete

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