Anodizing structure of surface treatment of injection molding parts

Abstract

The utility model provides a kind of surface treatment metal technology's imitative anodic oxidation structure of injection molding part, belong to injection processing technical field, the surface treatment metal technology's imitative anodic oxidation structure of injection molding part includes injection base body, oxidation texture layer and closed protective layer, injection base body uses engineering plastics material, oxidation texture layer is set to the outer surface of injection base body, oxidation texture layer is formed by multiple micro recesses interlaced imitative metal oxidation texture, micro recess is radially distributed along injection base body surface, closed protective layer is covered in the outer surface of oxidation texture layer, the thickness of closed protective layer is less than the depth of micro recess, so that the bottom of micro recess and closed protective layer between formation air gap structure, air gap structure is used to produce light refraction effect;The utility model can solve the problem that visual texture is not real, lacks stereoscopic sense and is difficult to keep metal optical characteristic on plastic material for a long time when simulating metal anodic oxidation effect of injection molding part surface.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding technology, and more specifically, it relates to an anodized-like structure for surface treatment of injection molded parts using a metal-like technology. Background Technology

[0002] Injection molding, a widely used plastic product processing technology in industry, occupies an important position in fields such as consumer electronics casings, automotive interior parts, and home appliance panels due to its advantages of high molding efficiency, low cost, and flexible design. As consumers' demands for product appearance quality continue to rise, the simple texture of plastic is no longer sufficient to meet market needs. More and more applications require injection-molded parts to have a metallic finish, with anodized metal surfaces becoming an ideal model to emulate due to their unique fine texture, soft luster, and high-end visual effect.

[0003] Existing technologies for metallizing injection molded parts mainly employ methods such as vacuum coating, water transfer printing, and metallic paint spraying. Vacuum coating achieves metallic luster by depositing a thin metal film layer on the plastic surface, but this method is costly and the coating layer is prone to cracking due to substrate deformation. Water transfer printing simulates a metal surface by transferring metallic texture patterns, but the transferred patterns are two-dimensional and lack the three-dimensional texture features of a real anodized metal surface. Metallic paint spraying produces metallic luster by adding metal particles to the paint, but the sprayed layer thickness is uneven and it is difficult to form a regular micro-texture structure similar to anodization. These existing methods all have significant shortcomings in simulating the effect of metal anodization, manifested in unrealistic visual texture, a lack of diverse gloss levels, and a lack of the light refraction variation effect of a real metal surface at different angles. Furthermore, the bonding strength between the existing treatment layer and the plastic substrate is limited, and the surface treatment layer is prone to peeling or wear during product use, making it difficult to maintain the metallization effect in the long term. Utility Model Content

[0004] In view of this, the present invention provides a simulated anodizing structure for surface treatment of injection molded parts using a metal-like technology, which can solve the technical problems in the prior art where the surface of injection molded parts has an unrealistic visual texture, insufficient gloss level, lack of three-dimensional texture details, and difficulty in maintaining metal-like optical properties on plastic materials when simulating the effect of metal anodizing.

[0005] This utility model is implemented as follows:

[0006] This invention provides a simulated anodizing structure for surface treatment of injection molded parts using a metal-like technique. The structure includes an injection molded substrate, an oxide texture layer, and a protective sealing layer. The injection molded substrate is made of engineering plastic. The oxide texture layer is disposed on the outer surface of the injection molded substrate. The oxide texture layer is formed by multiple interwoven micro-grooves creating a simulated metal oxide texture. These micro-grooves are radially distributed along the surface of the injection molded substrate. The protective sealing layer covers the outer surface of the oxide texture layer. The thickness of the protective sealing layer is less than the depth of the micro-grooves, creating an air gap structure between the bottom of the micro-grooves and the protective sealing layer. This air gap structure is used to generate a light refraction effect.

[0007] The technical effects of the simulated anodizing structure for surface treatment of injection molded parts provided by this utility model are as follows: By setting an oxide texture layer formed by multiple interwoven micro-grooves on the outer surface of the injection molded substrate, and covering the oxide texture layer with a closed protective layer whose thickness is less than the depth of the micro-grooves, an air gap structure is formed between the bottom of the micro-grooves and the closed protective layer. This air gap structure is used to generate a light refraction effect, thereby presenting a visual texture and gloss effect similar to real metal anodizing on the surface of the plastic product. At the same time, the closed protective layer is used to protect the oxide texture layer from external environmental corrosion, prolonging the durability of the simulated anodizing effect. The overall structure is simple and practical.

[0008] Based on the above technical solution, the anodized-like structure of the metal-like surface treatment technology for injection molded parts of this utility model can be further improved as follows:

[0009] The depth of the micro-grooves is two-thirds to four-fifths of the overall thickness of the oxide texture layer.

[0010] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the depth of the micro-grooves to two-thirds to four-fifths of the overall thickness of the oxide texture layer, the micro-grooves have sufficient depth to form an effective air gap structure and light refraction channel. At the same time, it avoids the problem that the oxide texture layer is not strong enough due to excessively deep grooves, and also avoids the problem that the light refraction effect is not obvious due to excessively shallow grooves. Thus, an ideal imitation metal visual effect is obtained while ensuring structural strength, and the rationality and practicality of the structural design are improved.

[0011] Furthermore, the cross-section of the micro-groove is trapezoidal, with the upper base width being smaller than the lower base width, and the angle between the sidewall of the trapezoidal structure and the surface of the injection-molded substrate being acute.

[0012] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by designing the cross-section of the micro-groove into a trapezoidal structure with the upper base width being smaller than the lower base width, the groove has a stable geometric shape. The acute angle formed by the trapezoidal sidewall and the injection molding substrate surface is used to guide light to undergo multiple reflections and refractions inside the groove, enhancing the three-dimensional layering effect of the metallic texture. At the same time, the gradient geometric shape of the trapezoidal structure is used to improve the bonding strength between the oxide texture layer and the injection molding substrate, preventing the texture layer from peeling off during use.

[0013] Furthermore, the outer surface of the oxide textured layer exhibits a wavy undulation pattern, with the height difference between the peaks and troughs of the wavy undulation pattern being less than the depth of the micro-grooves.

[0014] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by forming a wave-like undulation pattern on the outer surface of the oxide texture layer, and the height difference between the peaks and troughs is less than the depth of the micro-grooves, the surface presents a soft undulation change at the macro level. This undulation pattern is used to simulate the subtle unevenness of the real metal anodized surface after polishing, which enhances the realism of the simulation effect. At the same time, the wave-like undulation pattern is also used to disperse the direct reflection of external light, reduce the dazzling mirror reflection phenomenon, and improve visual comfort.

[0015] Furthermore, the spacing between adjacent micro-grooves increases from the center to the edge, and the micro-grooves density in the central region is greater than that in the edge region.

[0016] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the spacing between adjacent micro-grooves increase from the center to the edge, the density of micro-grooves in the central region is greater than that in the edge region. This gradual distribution method is used to simulate the difference in oxidation texture density caused by the current density decreasing from the center to the edge during the real metal anodizing process, which enhances the simulation effect. At the same time, the high-density texture in the central region provides a stronger visual focusing effect, guiding the user's attention to the core display area of ​​the product.

[0017] Furthermore, the protective layer and the oxide texture layer are connected by chemical bonds, and the surface roughness of the protective layer is less than that of the oxide texture layer.

[0018] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by connecting the closed protective layer and the oxide texture layer with chemical bonds, a strong bond between the two layers is achieved, avoiding the interface separation problem that may occur with mechanical bonding. At the same time, the surface roughness of the closed protective layer is less than that of the oxide texture layer, so that the surface of the closed protective layer has a smooth texture. This difference in roughness is used to give the surface a delicate touch while maintaining the texture effect of the underlying layer, thereby improving the feel and quality of the product and giving it a high-end feel.

[0019] Furthermore, the coverage area of ​​the oxide texture layer along the surface of the injection molded substrate is greater than 90% of the total area of ​​the outer surface of the injection molded substrate.

[0020] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the coverage area of ​​the oxide texture layer along the surface of the injection molded substrate greater than 90% of the total area of ​​the outer surface of the injection molded substrate, a large-scale coverage of the surface of the injection molded substrate is achieved, so that the product can present a consistent imitation metal anodizing effect when viewed from all angles, avoiding the visual discontinuity caused by partial coverage, improving the overall appearance and professionalism of the product, and at the same time, the large-area coverage also provides a more comprehensive surface protection function.

[0021] Furthermore, the edge of the injection-molded substrate is provided with a transition rounded corner, and the oxide texture layer extends to cover the surface of the transition rounded corner. The micro-grooves at the transition rounded corner extend along the curvature direction of the transition rounded corner.

[0022] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a transition rounded corner at the edge of the injection-molded substrate and extending the oxide texture layer to cover the surface of the transition rounded corner, and the direction of the micro grooves at the transition rounded corner extends along the curvature direction of the transition rounded corner, the texture is naturally continued in the transition area of ​​the curved surface, avoiding abrupt cut-off or abrupt change in direction of the texture at the edge, making the overall visual effect smoother and more harmonious. At the same time, the direction of the grooves extending along the curvature direction is used to guide the light to produce continuous refraction changes on the curved surface, enhancing the three-dimensional effect.

[0023] Furthermore, the injection molding matrix is ​​made of polycarbonate or acrylonitrile butadiene styrene copolymer.

[0024] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by using polycarbonate material or acrylonitrile butadiene styrene copolymer material to make the injection molding matrix, the good mechanical strength, dimensional stability and surface treatment adaptability of these engineering plastic materials are utilized. Polycarbonate material is used to provide excellent impact resistance and transparency, while acrylonitrile butadiene styrene copolymer material is used to provide good rigidity and surface gloss. Both materials have the characteristics of being easy to injection mold and surface texture processing, providing ideal matrix conditions for the subsequent formation of oxidized texture layer.

[0025] Furthermore, the bottom of the micro-groove is arc-shaped or pointed, and the sealing protective layer is made of silicone resin or polyurethane material.

[0026] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by designing the bottom of the micro-groove into an arc shape or a pointed shape, and using silicone resin or polyurethane material to form a closed protective layer, the bottom shape of the groove and the protective layer material are optimally matched. The arc-shaped bottom is used to produce a soft light scattering effect, and the pointed bottom is used to produce a sharp light refraction effect. The silicone resin is used to provide excellent weather resistance and hydrophobicity, and the polyurethane material is used to provide good wear resistance and flexibility. Different bottom shapes and protective layer material combinations are used to meet the differentiated needs of different application scenarios for visual effects and performance.

[0027] Compared with existing technologies, the beneficial effects of the anodized-like structure of the metal-like surface treatment technology for injection molded parts provided by this utility model are as follows: By constructing an oxide texture layer formed by interwoven micro-grooves on the surface of the injection molded substrate, and setting a closed protective layer of a specific thickness above the texture layer, an air gap structure is formed between the bottom of the grooves and the protective layer. This air gap structure utilizes the difference in refractive index between air and solid materials to generate a light refraction effect, thereby presenting a visual texture and gloss level highly similar to the real metal anodized surface on the surface of the plastic product, solving the problem of unrealistic visual effects in existing technologies. By precisely designing the depth, cross-sectional shape, distribution density, and orientation of the micro-grooves, a three-dimensional presentation of texture details is achieved, enhancing the effect of light refraction changes at different angles, so that the surface can present a rich sense of metallic luster from all viewing angles, solving the problems of insufficient sense of layering and lack of three-dimensionality in existing technologies. The sealing protective layer is firmly bonded to the oxide texture layer via chemical bonds, isolating the texture layer from external environmental erosion. Simultaneously, the protective layer material utilizes silicone resin or polyurethane, exhibiting excellent weather resistance and wear resistance, significantly extending the retention time of the metallic optical properties and solving the problem of persistent effect maintenance in existing technologies. The overall structure comprises only three main components: the injection-molded substrate, the oxide texture layer, and the sealing protective layer. Its simple structure is easy to implement, with controllable processing costs, making it suitable for large-scale industrial production applications. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of a simulated anodizing structure for a metal-like surface treatment technology for injection molded parts;

[0030] Figure 2 for Figure 1An enlarged schematic diagram of part A in the middle;

[0031] Figure 3 A cross-sectional view of a simulated anodizing structure in a metal-like surface treatment technology for injection molded parts;

[0032] Figure 4 for Figure 3 Enlarged schematic diagram of part B;

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 10. Injection-molded substrate; 11. Oxidized textured layer; 12. Sealing protective layer; 13. Micro-grooves; 14. Air gap structure; 15. Transition rounded corners. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0036] like Figure 1-4 The image shown is an embodiment of an anodized structure for surface treatment of injection molded parts using a metal-like technique. In this embodiment, it includes an injection molded substrate 10, an oxide texture layer 11, and a protective sealing layer 12. The injection molded substrate is made of engineering plastic. The oxide texture layer is disposed on the outer surface of the injection molded substrate. The oxide texture layer is formed by multiple interwoven micro-grooves 13 to create an anodized texture similar to metal. The micro-grooves are radially distributed along the surface of the injection molded substrate. The protective sealing layer covers the outer surface of the oxide texture layer. The thickness of the protective sealing layer is less than the depth of the micro-grooves, so that an air gap structure 14 is formed between the bottom of the micro-grooves and the protective sealing layer. The air gap structure is used to generate a light refraction effect.

[0037] In the above technical solution, the depth of the micro-grooves is two-thirds to four-fifths of the overall thickness of the oxide texture layer.

[0038] Furthermore, in the above technical solution, the cross-section of the micro-groove is trapezoidal, the width of the upper base of the trapezoidal structure is smaller than the width of the lower base, and the angle between the sidewall of the trapezoidal structure and the surface of the injection-molded substrate is acute.

[0039] Furthermore, in the above technical solution, the outer surface of the oxide texture layer has a wave-like undulating shape, and the height difference between the peaks and troughs of the wave-like undulating shape is less than the depth of the micro-grooves.

[0040] Furthermore, in the above technical solution, the spacing between adjacent micro-grooves increases from the center to the edge, and the micro-grooves density in the central region is greater than that in the edge region.

[0041] Furthermore, in the above technical solution, the sealing protective layer and the oxide texture layer are connected by chemical bonds, and the surface roughness of the sealing protective layer is less than that of the oxide texture layer.

[0042] Furthermore, in the above technical solution, the coverage area of ​​the oxide texture layer along the surface of the injection molded substrate is greater than 90% of the total area of ​​the outer surface of the injection molded substrate.

[0043] Furthermore, in the above technical solution, the edge of the injection-molded substrate is provided with a transition fillet 15, the oxide texture layer extends to cover the surface of the transition fillet, and the micro grooves at the transition fillet extend along the curvature direction of the transition fillet.

[0044] Furthermore, in the above technical solution, the injection molding matrix is ​​made of polycarbonate material or acrylonitrile butadiene styrene copolymer material.

[0045] Furthermore, in the above technical solution, the bottom of the micro-groove is arc-shaped or pointed, and the sealing protective layer is made of silicone resin or polyurethane material.

[0046] The method of using this utility model is as follows: First, the injection-molded substrate is manufactured using conventional injection molding processes. The injection-molded substrate is made of polycarbonate or acrylonitrile butadiene styrene copolymer. After injection molding, the surface of the substrate is cleaned to remove oil and mold release agent residue. Then, micro-grooves are formed on the surface of the injection-molded substrate using laser etching or chemical etching methods. During laser etching, the scanning path and power parameters of the laser beam are controlled according to a pre-designed texture pattern, so that the laser beam ablates the substrate surface to form grooves of the required depth and shape. During chemical etching, a corrosion-resistant mask is first coated on the substrate surface, and texture pattern openings are formed using photolithography. Then, a chemical etching solution is used to etch the opening areas to form grooves. After the micro-grooves are processed, the surface is cleaned to remove processing residues. Then, a sealing protective layer is applied to the surface of the oxide texture layer using spraying or dip coating methods. During spraying, the spraying pressure and spray gun movement speed are controlled to obtain a uniform coating thickness. During dip coating, the coating viscosity and lifting speed are controlled to ensure that the coating thickness is less than the depth of the micro-grooves. After the protective layer is applied, a curing process is performed. For silicone resin-based protective layers, heat curing is used, with the heating temperature controlled at 80~120℃ and maintained for 30~60 minutes. For polyurethane-based protective layers, room temperature curing or UV curing is used. For UV curing, a 365nm wavelength UV lamp is used for 3~5 minutes. After curing, an injection-molded part with a simulated anodized effect is obtained. The product requires no special maintenance during normal use; simply wipe the surface with a soft, dry cloth to remove dust. Avoid using strong acid or alkali cleaning agents to prevent damage to the protective layer.

[0047] The following is a specific embodiment 1 of this utility model: This embodiment provides a simulated anodized structure using a metal-like surface treatment technology for injection-molded parts of smartphone casings. The injection-molded substrate is made of polycarbonate material through injection molding, with a thickness of 1.2mm and external dimensions of 145mm in length and 72mm in width. The substrate surface undergoes degreasing and plasma cleaning treatment. The oxide texture layer is formed on the outer surface of the injection-molded substrate using a laser etching method. A nanosecond pulsed laser with a wavelength of 1064nm is used for processing, with a laser power set to 15W, a scanning speed of 800mm / s, and a pulse frequency of 60kHz. The micro-grooves are radially distributed, with the radial center located in the brand logo area of ​​the phone casing. The grooves extend radially from the center outwards. The spacing between adjacent grooves in the central area is 8μm~12μm, and the spacing between adjacent grooves in the edge area is 18μm~25μm, exhibiting a gradual distribution characteristic of denser grooves in the center and sparser grooves at the edges. Each micro-groove has a depth of 22μm~28μm and a width of 5μm~8μm. The groove cross-section has a trapezoidal structure, with an upper base width of 5μm and a lower base width of 8μm. The angle between the trapezoidal sidewall and the substrate surface is 70°~75°. The bottom of the groove is arc-shaped with a radius of 2μm~3μm. The overall thickness of the oxide textured layer is 35μm~40μm, and the surface of the layer has a wavy undulating shape. The height difference between the peaks and troughs is 8μm~12μm, and the wavelength is 150μm~200μm. After the oxide textured layer is formed, a sealing protective layer is applied to its surface using a spraying method. The protective layer material is modified organosilicon resin, with ultraviolet absorbers and antioxidants added to the resin to improve weather resistance. High-pressure airless spraying equipment was used for coating, with a spraying pressure of 18MPa~22MPa, a spray gun distance of 25cm~30cm from the surface, and a spray gun movement speed of 40cm / s~50cm / s. Two coats were applied to obtain a uniform coating. The wet film thickness of the sealing protective layer was 25μm~30μm. After curing at 120℃ for 45 minutes, the dry film thickness was 15μm~18μm. The protective layer thickness was less than the depth of the micro-grooves by approximately 10μm, creating an air gap structure of approximately 10μm thickness between the bottom of the grooves and the protective layer. The sealing protective layer and the oxide textured layer were chemically bonded through silicon-oxygen bonds formed between the organosilicon molecules and the hydroxyl groups on the polycarbonate surface, resulting in a strong bonding interface. The surface of the sealing protective layer was polished, with a surface roughness of 0.3μm~0.5μm, while the surface roughness of the oxide textured layer was 1.5μm~2.0μm, creating a significant difference in roughness. The finished phone case exhibits a delicate anodized aluminum texture. Under different angles of light, a soft luster change and rich textural layers can be observed, with an appearance highly similar to a real anodized aluminum case. When the case is installed on a phone for daily use, the metallic effect remains stable. After simulated use testing, the surface texture is clear and the gloss is uniform, with the protective layer remaining intact without any peeling.This embodiment achieves a highly realistic metal anodizing effect on the surface of a plastic mobile phone casing, significantly reducing manufacturing costs while obtaining visual quality comparable to that of a metal casing. This satisfies the dual demands of consumer electronics products for a premium appearance and lightweight design, and has significant industrial application value.

[0048] The following is another specific embodiment 2 of this utility model: This embodiment is an improvement on embodiment 1, specifically for the application scenario of automotive interior trim panels. The injection-molded substrate is made of acrylonitrile butadiene styrene copolymer material, and the substrate thickness is increased to 2.5mm to meet the rigidity requirements of automotive interior parts. The external dimensions are a rectangular panel with a length of 280mm and a width of 180mm. The micro-grooves are processed by chemical etching. First, photoresist is spin-coated on the substrate surface and a texture pattern mask is formed by ultraviolet exposure and development. Then, a mixed solution of chloroform and acetone is used as the etching solution for etching. The etching time is controlled at 8 to 12 minutes, and the etching depth is 18μm to 22μm. The cross-section of the micro-grooves is changed to a pointed shape, with the angle of the bottom of the groove being 40° to 45°. This pointed bottom is used to produce a sharper light refraction effect, giving the surface a visual feature similar to brushed metal. The sealing protective layer material is changed to a two-component polyurethane coating, which has excellent wear resistance and flexibility, suitable for the frequent contact and temperature change environment of automotive interior parts. The coating is applied by spraying and then cured at room temperature for 24 hours. The cured protective layer is 12μm~15μm thick with a surface hardness of 2H~3H, effectively resisting scratches from fingernails and minor friction from hard objects such as keys. The finished automotive interior panel exhibits a high-end brushed metallic texture, displaying a flowing light and shadow effect under ambient light inside the car, significantly enhancing the luxurious and technological feel of the interior and providing an economical and practical metallization solution for traditional plastic interior parts.

[0049] The following is another specific embodiment 3 of this utility model: This embodiment is an improvement on embodiment 1, specifically for the application scenario of outdoor lighting fixture housings. The injection molding matrix material is still polycarbonate, but a weather-resistant grade with added UV stabilizers and antioxidants is selected to adapt to UV radiation and temperature and humidity changes in the outdoor environment. The distribution of the micro-grooves is changed to a concentric ring pattern, with the center located at the edge of the central light-transmitting window of the lamp housing. The grooves extend circumferentially to form concentric rings, with a radial distance of 15μm~20μm between the rings. This concentric ring distribution is used to create a concentric visual guiding effect, highlighting the central light-emitting area of ​​the lamp. The groove depth is increased to 30μm~35μm, and the overall thickness of the oxide texture layer is increased to 45μm~50μm to enhance the three-dimensionality and wear resistance of the texture. The sealing protective layer uses modified silicone resin with added nano-silica particles. These nanoparticles enhance the coating's hardness and scratch resistance. The protective layer is 20μm~23μm thick and has a surface hardness of 4H~5H. The oxide texture layer covers over 95% of the total outer surface area of ​​the lamp housing, leaving only a small untreated area around the mounting screw holes. The finished lamp housing exhibits a refined metallic texture, displaying rich variations in gloss under both natural daylight and artificial light at night. It also boasts excellent weather resistance, making it suitable for long-term outdoor use, providing an aesthetically pleasing and durable surface treatment solution for outdoor lighting products.

[0050] Specifically, the principle of this invention is as follows: an oxide texture layer is formed by constructing an array of micro-grooves with specific geometric shapes on the surface of the injection-molded substrate. These micro-grooves are radially distributed on the surface and have a trapezoidal cross-section. When external light shines on the surface, the light first passes through the closed protective layer and enters the oxide texture layer. Since the depth of the micro-grooves is greater than the thickness of the closed protective layer, there is an air gap structure filled with air between the bottom of the groove and the protective layer. After entering the groove, the light is refracted at the air gap interface. The refractive index of air is about 1.0, while the refractive index of the solid protective layer material is usually between 1.4 and 1.6. This difference in refractive index causes the light to undergo a significant change in refraction angle at the air gap interface. The trapezoidal sidewalls of the groove further guide the light to undergo multiple reflections inside the groove, so that the light is emitted from the groove at different angles, presenting a soft luster and delicate texture effect similar to the surface of anodized metal on a macroscopic scale. The radial distribution of micro-grooves simulates the texture characteristics caused by the diffusion of current from the center outward during the anodizing process of real metals, while the increasing spacing of the grooves from the center to the edge simulates the texture density changes caused by differences in current density. These designs enable the simulation effect to highly reproduce the characteristics of real metal surfaces at the microscopic level. The wavy undulation of the outer surface of the oxide texture layer is used to disperse the specular reflection of light at the macroscopic level, giving the surface a soft diffuse gloss rather than a glaring specular gloss. This gloss characteristic is highly consistent with the visual effect of real anodized aluminum surfaces. The closed protective layer is bonded to the oxide texture layer through chemical bonds, forming a stable interface connection. The high weather resistance and wear resistance of the protective layer material are used to resist the damage to the texture layer caused by ultraviolet radiation, temperature and humidity changes, and mechanical friction, thereby maintaining the integrity of the air gap structure and the stability of the light refraction effect over a long period of time, solving the core technical problem of the difficulty in maintaining the metallization effect for a long time in existing technologies.

Claims

1. A simulated anodizing structure for surface treatment of injection-molded parts using a metal-like technology, comprising an injection-molded substrate, an oxide texture layer, and a protective sealing layer, wherein the injection-molded substrate is made of engineering plastic, the oxide texture layer is disposed on the outer surface of the injection-molded substrate, and the oxide texture layer is formed by multiple interwoven micro-grooves to create a simulated metal oxide texture, characterized in that, The micro-grooves are radially distributed along the surface of the injection-molded substrate. A protective sealing layer covers the outer surface of the oxide texture layer. The thickness of the protective sealing layer is less than the depth of the micro-grooves, so that an air gap structure is formed between the bottom of the micro-grooves and the protective sealing layer. The air gap structure is used to generate a light refraction effect.

2. The pseudo-anodization structure of the injection molding surface treatment metal technology according to claim 1, wherein, The depth of the micro-grooves is two-thirds to four-fifths of the overall thickness of the oxide texture layer.

3. The pseudo-anodization structure of the injection molding surface treatment metal technology according to claim 2, characterized in that, The cross-section of the micro-groove is trapezoidal, with the upper base width being smaller than the lower base width, and the angle between the sidewall of the trapezoidal structure and the surface of the injection-molded substrate being acute.

4. The pseudo-anodization structure of the injection molding surface treatment metal technology according to claim 3, characterized in that, The outer surface of the oxide textured layer has a wavy, undulating shape, and the height difference between the peaks and troughs of the wavy shape is less than the depth of the micro-grooves.

5. The pseudo-anodization structure of the injection molding surface treatment metal technology according to claim 4, characterized in that, The spacing between adjacent micro-grooves increases from the center to the edge, and the density of micro-grooves in the central region is greater than that in the edge region.

6. The pseudo-anodization structure of the injection molding surface treatment metal technology according to claim 5, characterized in that, The protective layer and the oxide texture layer are connected by chemical bonds, and the surface roughness of the protective layer is smaller than that of the oxide texture layer.

7. The pseudo-anodization structure of the injection molding surface treatment metal technology according to claim 6, characterized in that, The coverage area of ​​the oxide texture layer along the surface of the injection molded substrate is greater than 90% of the total area of ​​the outer surface of the injection molded substrate.

8. The pseudo-anodization structure of the injection molding surface treatment metal technology according to claim 7, characterized in that, The edges of the injection-molded substrate are provided with transition rounded corners, and the oxide texture layer extends to cover the surface of the transition rounded corners. The micro-grooves at the transition rounded corners extend along the curvature direction of the transition rounded corners.

9. The pseudo-anodization structure of the injection molding surface treatment metal technology according to claim 8, characterized in that, The injection molding matrix is ​​made of polycarbonate or acrylonitrile butadiene styrene copolymer.

10. The pseudo-anodization structure of the injection molding surface treatment metal technology according to claim 9, wherein, The bottom of the micro-groove is rounded or pointed, and the sealing protective layer is made of silicone resin or polyurethane material.

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