Plastic surface semi-matte processing technology and middle frame structural member

Abstract

The invention discloses a plastic surface semi-matte processing technology. The technology comprises the following steps: injection molding: carrying out injection molding through a mold to obtain a mobile phone middle frame structural member; polishing the slide clamping line: polishing the injection-molded middle frame structural member; paint layer coating is conducted, specifically, UV paint and NCVM colored paint are adopted to conduct coating on the polished middle frame structural part; and sand blasting is conducted, specifically, compressed air is adopted as power to form a high-speed jet beam to jet the jet material to the surface of the middle frame structural part at a high speed, and sand blasting treatment is conducted. The highlight product obtained after paint layer coating is subjected to processing treatment through a special sand blasting process, so that a plurality of irregularly-arranged concave surfaces are formed on the surface of the structural part, and the surface of the structural part has a semi-matte and smooth matte common effect; the surface of the structural part subjected to sand blasting treatment can effectively prevent the problems of fingerprint sticking and scratching.

Description

Technical Field

[0001] The present invention relates to the field of intelligent manufacturing technology, and in particular to a semi-matte processing technology for a plastic surface and a middle frame structural component. Background Art

[0002] General glass or plastic shells are mostly used in electronic communication products such as mobile phones and tablets. In order to meet the requirements of strength, aesthetics, touch, etc., in the process of forming the final shell product, they often need to go through a series of processes such as molding, spraying, etching, laser engraving, electroplating, etc.

[0003] In order to fully demonstrate the color and texture effects of the mid-coat produced by NCVM electroplating (Non Conductive Vacuum Metallization), the industry often makes the UV topcoat into a high-gloss effect. However, high-gloss UV is prone to fingerprints and scratches, affecting the user experience. If it is made into a semi-matte effect, although it can improve the problems of high-gloss UV fingerprints and scratches, the matte UV has a low light transmittance, which reduces the vividness of the metal color of the mid-coat and greatly reduces the color texture effect. Therefore, the traditional process needs to be improved. To this end, this application proposes a semi-matte processing technology for plastic surface to solve such problems. Summary of the Invention

[0004] Based on this, in order to solve the problems existing in the prior art, on the one hand, the present application provides a semi-matte processing technology for plastic surface, the process flow includes:

[0005] Injection molding: The mobile phone middle frame structural parts are obtained by injection molding;

[0006] Polishing the slider clamp line: polishing the injection molded middle frame structural parts;

[0007] Paint coating: Use UV paint and NCVM paint to coat the polished middle frame structural parts;

[0008] Sand blasting: Using compressed air as the power to form a high-speed jet beam to spray the material at high speed onto the surface of the middle frame structure for sand blasting.

[0009] Furthermore, in the step of polishing the slide clamp, the process flow also includes:

[0010] Use back velvet with a hardness of 1100-1300, a fineness of 600-800 mesh, and a thickness of 5-10mm for grinding.

[0011] Furthermore, after grinding with extra-hard sponge sand, the process also includes:

[0012] Use back velvet with a hardness of 60-100, a fineness of 1500-2500 mesh, and a thickness of 5-15mm for polishing.

[0013] Furthermore, before the paint layer is applied, the process also includes:

[0014] Treatment agent layer coating: The polished middle frame structural parts are coated with a treatment agent.

[0015] Furthermore, in the paint coating step, the process also includes:

[0016] Primer layer coating: Use UV paint to coat the coating treatment agent layer, and the film thickness is controlled at 15-20um during coating, the viscosity of the paint is controlled at 8 seconds to 8.2 seconds, and the thinner ratio of the paint is 30%.

[0017] Furthermore, after the primer is applied, the process also includes:

[0018] Middle paint coating: Use NCVM color paint to spray the middle frame structural parts for the second time after coating the primer, and the film thickness of the middle paint layer is controlled at 8-10um.

[0019] Furthermore, after the midcoat is applied, the process also includes:

[0020] Topcoat coating: Use wear-resistant UV paint to coat the middle frame structural parts for the third time after coating the middle paint layer. During coating, the film thickness of the paint is controlled at 30-35um, and the viscosity of the paint is controlled at 8.4-8.6 seconds.

[0021] Furthermore, after the primer layer is applied and before the midcoat layer is applied, the process flow also includes:

[0022] Vacuum plating layer: The middle frame structural parts are vacuum plated after being coated with primer.

[0023] Furthermore, after the primer layer is applied, the process also includes:

[0024] The middle frame structural member coated with the primer layer is baked.

[0025] On the other hand, the present application provides a mobile phone middle frame structural component, which is prepared by any of the above-mentioned plastic surface semi-matte processing processes, including a structural component body, a treatment agent layer, a primer layer, an electroplating layer, a mid-paint layer and a topcoat layer. The treatment agent layer, the primer layer, the electroplating layer, the mid-paint layer and the topcoat layer are arranged in sequence on the surface of the structural component body, and the surface of the topcoat layer is provided with a number of irregularly arranged concave surfaces and flat surfaces.

[0026] Beneficial effect: This application processes the high-gloss product obtained after coating with a paint layer through a special sandblasting process, so that the surface of the structural part forms a number of irregularly arranged concave surfaces, so that the surface of the structural part forms a semi-matte and matte effect. In addition, the surface of the structural part after sandblasting can effectively prevent fingerprints and scratches. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a process flow chart of the semi-matte finishing process for plastic surfaces of the present invention;

[0029] Figure 2 This is a flow chart of the paint coating process for the semi-matte finishing process of the plastic surface of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the frame structure of the present invention;

[0031] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0032] In the figure: 1, structural part body; 2, treatment agent layer; 3, primer layer; 4, electroplating layer; 5, mid-coat layer; 6, topcoat layer; 61, concave surface; 62, flat surface.

[0033] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] like Figure 1-2 As shown, the embodiment of the present application provides a semi-matte processing technology for plastic surface, including

[0038] S1. Injection molding: The mobile phone middle frame structural parts are obtained by injection molding;

[0039] S2. Polishing the slider clamp line: Polish the injection molded middle frame structural parts with sandpaper;

[0040] S3. Treatment agent coating: coating the polished middle frame structural parts with a treatment agent;

[0041] S4. Paint coating: Use UV paint and NCVM paint to coat the polished middle frame structural parts;

[0042] S5. Sandblasting: Use compressed air as the power to form a high-speed jet beam to spray the material at high speed onto the surface of the middle frame structure for sandblasting.

[0043] In this embodiment, the spray material is sprayed onto the surface of the middle frame at high speed to form a high-speed jet beam. Due to the impact and cutting effect of the spray material on the paint layer of the middle frame structural parts, the shape of the highly transparent and high-gloss surface of the paint layer of the middle frame structural parts changes. At this time, the micro-concave surface produced by the impact of the spray material presents a matte state, which affects the light transmittance and makes the paint layer of the middle frame structural parts have a matte effect. The paint layer of the middle frame structural parts that are not impacted by the spray material retains the original transparent high-gloss effect, and the original bright metal effect of the electroplating is presented. In this way, a semi-matte and matte state with both matte and high-gloss effects on the same surface is achieved. The concave surface structure formed makes the paint layer of the middle frame structural parts less likely to be attracted by fingerprints and scratched. The spray material can be corundum sand or ceramic beads.

[0044] This application processes the high-gloss product obtained after coating with a paint layer through a special sandblasting process, so that the surface of the structural part forms a number of irregularly arranged concave surfaces, so that the surface of the structural part forms a semi-matte and matte effect. In addition, the surface of the structural part after sandblasting can effectively prevent fingerprints and scratches.

[0045] In one embodiment, in the step of polishing the slide clamp, the process further includes:

[0046] Use back velvet with a hardness of 1100-1300, a fineness of 600-800 mesh, and a thickness of 5-10mm for grinding.

[0047] In this embodiment, extra-hard sponge sand with a hardness of 1209, a fineness of 700 mesh, and a thickness of 5 mm is selected for grinding. The use of high-hardness, low-thickness coarse sandpaper can ensure that the refinement of the structure of the middle frame structure will not be affected during grinding.

[0048] In one embodiment, after polishing with high-hardness backing velvet, low-fineness, and thin-thick extra-hard sponge sand, the process further includes:

[0049] Use back velvet with a hardness of 60-100, a fineness of 1500-2500 mesh, and a thickness of 5-15mm for polishing.

[0050] In this embodiment, sponge sand with a hardness of 80, a fineness of 2000 mesh, and a thickness of 10 mm is selected for grinding. The use of sponge sand with low hardness and high thickness can ensure that the edges of the product structure are covered during grinding, reduce defects, and improve the yield rate.

[0051] In one embodiment, before applying the paint layer, the process further includes:

[0052] Treatment agent layer coating: The polished middle frame structural parts are coated with a treatment agent.

[0053] In this embodiment, the treatment agent is a liquid resin that fills the depressions on the surface of the material and increases the surface smoothness. It also improves the density of the material and reduces the orange peel effect of the plastic workpiece.

[0054] By coating the polished middle frame structural parts with a treatment agent, the adhesion between the surface of the middle frame structural parts and the primer can be increased, and the coating effect of the primer can be improved. The thickness of the coating should not be too thick to avoid slight oil accumulation resulting in fat edges. Optionally, the coating film thickness is controlled at 8-10um. The viscosity of the treatment agent should not be too high to avoid the effect being too rough during spraying. Optionally, the viscosity is 7.8 seconds.

[0055] In one embodiment, in the paint layer coating step, the process further comprises:

[0056] S41. Primer layer coating: Use UV paint to coat the coating treatment agent layer, and the film thickness is controlled at 15-20 μm during coating, the viscosity of the paint is controlled at 8 seconds to 8.2 seconds, and the thinner ratio of the paint is 30%.

[0057] S42, vacuum plating layer: vacuum plating treatment is performed on the middle frame structure after the primer is applied

[0058] S43, mid-coat coating: Use NCVM color paint to spray the middle frame structural parts after primer coating for the second time, and the film thickness of the mid-coat layer is controlled at 8-10um.

[0059] S44. Topcoat coating: Use wear-resistant UV paint to coat the middle frame structural parts after coating the middle paint layer for the third time. During coating, the film thickness of the paint is controlled at 30-35um, and the viscosity of the paint is controlled at 8.4-8.6 seconds.

[0060] In this embodiment, the topcoat layer uses a highly wear-resistant material, which can improve the wear resistance of the surface of the middle frame structural member and further enhance the anti-scratch capability.

[0061] In one embodiment, after the primer layer is applied, the process further includes:

[0062] The middle frame structural member coated with the primer layer is baked.

[0063] In this embodiment, after the primer layer is applied, a slight fat edge phenomenon may occur. Therefore, by baking the middle frame structural parts after the primer layer is applied, the primer layer can effectively reduce the fat edge effect after leveling, diluent volatilization and UV curing during the baking process.

[0064] like Figure 3 As shown, an embodiment of the present application provides a mobile phone middle frame structural component, which is prepared by the plastic surface semi-matte processing technology of any of the above embodiments, including a structural component body 1, a treatment agent layer 2, a primer layer 3, an electroplating layer 4, a mid-paint layer 5 and a topcoat layer 6. The treatment agent layer 2, the primer layer 3, the electroplating layer 4, the mid-paint layer 5 and the topcoat layer 6 are arranged in sequence on the surface of the structural component body 1, and the surface of the topcoat layer 6 is provided with a number of irregularly arranged concave surfaces 61 and flat surfaces 62.

[0065] In this embodiment, after the topcoat layer 6 is sandblasted, a micro-concave surface 61 is formed on the surface of the topcoat layer 6 after being hit by the spray material, and the surface not hit by the spray material remains in a flat surface 62 state. The concave surface 61 presents a matte state, which affects the light transmittance and makes the paint layer of the middle frame structural member become a matte effect; the flat surface 62 retains the original transparent high-gloss effect, and presents the original bright metal effect of the electroplating, forming a semi-matte and matte state in which the same surface has both matte and high-gloss effects.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A semi-matte processing technology for plastic surface, characterized in that: The process includes: Injection molding: The mobile phone middle frame structural parts are obtained by injection molding; Polishing the slider clamp line: polishing the injection molded middle frame structural parts; Paint coating: Use UV paint and NCVM paint to coat the polished middle frame structural parts; Sand blasting: Using compressed air as the power to form a high-speed jet beam to spray the material at high speed onto the surface of the middle frame structure for sand blasting.

2. The semi-matte finishing process for plastic surface according to claim 1, characterized in that: In the step of grinding the slide clamp, the process also includes: Use back velvet with a hardness of 1100-1300, a fineness of 600-800 mesh, and a thickness of 5-10mm for grinding.

3. The semi-matte finishing process for plastic surface according to claim 2, characterized in that: After sanding with extra-hard sponge sand, the process also includes: Use back velvet with a hardness of 60-100, a fineness of 1500-2500 mesh, and a thickness of 5-15mm for polishing.

4. The semi-matte finishing process for plastic surface according to claim 1, characterized in that: Before the paint layer is applied, the process also includes: Treatment agent layer coating: The polished middle frame structural parts are coated with a treatment agent.

5. The semi-matte finishing process for plastic surface according to claim 4, characterized in that: During the paint application step, the process also includes: Primer layer coating: Use UV paint to coat the coating treatment agent layer, and the film thickness is controlled at 15-20um during coating, the viscosity of the paint is controlled at 8 seconds to 8.2 seconds, and the thinner ratio of the paint is 30%.

6. The semi-matte finishing process for plastic surface according to claim 5, characterized in that: After the primer is applied, the process also includes: Middle paint coating: Use NCVM color paint to spray the middle frame structural parts for the second time after coating the primer, and the film thickness of the middle paint layer is controlled at 8-10um.

7. The semi-matte finishing process for plastic surface according to claim 6, characterized in that: After the midcoat is applied, the process also includes: Topcoat coating: Use wear-resistant UV paint to coat the middle frame structural parts for the third time after coating the middle paint layer. During coating, the film thickness of the paint is controlled at 30-35um, and the viscosity of the paint is controlled at 8.4-8.6 seconds.

8. The semi-matte finishing process for plastic surface according to claim 6, characterized in that: After the primer layer is applied and before the midcoat layer is applied, the process also includes: Vacuum plating layer: The middle frame structural parts are vacuum plated after being coated with primer.

9. The semi-matte finishing process for plastic surface according to claim 5, characterized in that: After the primer layer is applied, the process also includes: The middle frame structural member coated with the primer layer is baked.

10. A mobile phone middle frame structural component, characterized in that: The plastic surface is prepared by the semi-matte processing technology of any one of claims 1 to 9, comprising a structural part body, a treatment agent layer, a primer layer, an electroplating layer, a mid-paint layer and a topcoat layer, wherein the treatment agent layer, the primer layer, the electroplating layer, the mid-paint layer and the topcoat layer are sequentially arranged on the surface of the structural part body, and the surface of the topcoat layer is provided with a plurality of irregularly arranged concave surfaces and flat surfaces.

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