Surface treatment process for single-color injection molding part in electroplating state and light-transmitting state

Abstract

The invention discloses a surface treatment process for enabling a single-color injection molded part to be in an electroplating state and a light-transmitting state, and relates to the technical field of surface treatment of injection molded parts. A first front protection layer is formed by spraying shading black paint on the upper surface of a material layer, and then a light-transmitting pattern area is formed through laser etching; the first front protective layer is formed by UV spraying primer on the upper surface of the first front protective layer; forming an aluminum film layer on the upper surface of the second front protection layer through magnetron sputtering; colored paint is sprayed on the surface of the third front protective layer; and colorless transparent finish paint is sprayed on the surface of the fourth front protective layer. The material layer and the multiple film layers are mutually combined to form the film layer structure, laser etching is utilized, the product is electroplated in a static state, when an atmosphere lamp in the product is turned on, light beams of the atmosphere lamp can be emitted from a light-transmitting area, the dynamic surface state is presented, and the electroplating state and the light-transmitting state of the single-color injection molding part are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of surface treatment of injection molded parts, in particular to a surface treatment process of a single-color injection molded part presenting two states of electroplating and light transmission. Background Art

[0002] With the diversification and personalization of automobile interior and exterior trims, automobile interior and exterior trims have been given more changes. When driving at night, the atmosphere light is installed, and the color of the atmosphere light can change with the music to achieve a cool effect. For the existing process, the LOGO is generally laser engraved after the injection molding material is painted, and then the protective varnish is sprayed, which can only present a single color or a state of light transmission;

[0003] The Chinese invention patent application with publication number CN106958030A discloses a plastic electroplating method and an electroplated plastic part, wherein a plastic electroplating method is disclosed, comprising: preparing a color-platable plastic mold using a plateable plastic material having a preset color; plating a metal layer on the upper surface of the color-platable plastic mold, and etching the surface of the metal layer to obtain a preset pattern, wherein the bottom surface of the hollowed-out portion of the preset pattern is the upper surface of the color-platable plastic mold. By preparing a color-platable plastic mold using a color-platable plastic material having a preset color, and forming a metal layer and a preset pattern on the upper surface of the color-platable plastic mold, that is, by etching the metal layer to expose the surface of the color-platable plastic mold, when applied to automotive interior parts, the light-guiding requirements are achieved, and a beacon function with different colors can also be achieved.

[0004] The above electroplating process has relatively simple colors, including gold, silver, copper, gun gray, black chrome, etc. The light transmission and electroplating effect achieved in combination with the internal lighting conditions is relatively simple. Summary of the invention

[0005] In order to solve the technical problem of appearance of automobile interior and exterior trims, the present invention provides a surface treatment process for monochrome injection molded parts in two states: electroplating and light transmission. The following technical solution is adopted:

[0006] The surface treatment process of the single-color injection molded parts presents two states of electroplating and light transmission, which is used to produce automobile interior decoration parts in two states of electroplating and light transmission. The automobile interior decoration parts include a material layer, a first front protection layer, a second front protection layer, a third front protection layer, a fourth front protection layer and a fifth front protection layer are arranged in sequence from bottom to top, and the first front protection layer adopts laser engraving technology to form a light transmission pattern area;

[0007] The surface treatment process of automotive interior parts includes the following steps:

[0008] Step 1, obtaining a material layer by injection molding;

[0009] Step 2: The first front protective layer is a light-shielding black paint coating. The first front protective layer is formed by spraying light-shielding black paint on the upper surface of the material layer, and then laser engraving a light-transmitting pattern area;

[0010] Step 3, the second front protective layer is a UV primer coating, which is formed by UV spraying a primer on the upper surface of the first front protective layer;

[0011] Step 4, the third front protective layer is an aluminum film layer, and the aluminum film layer is formed on the upper surface of the second front protective layer by magnetron sputtering;

[0012] Step 5, the fourth front protective layer is a UV paint coating, which is formed by spraying paint on the surface of the third front protective layer;

[0013] Step 6, the fifth front protective layer is a topcoat layer, which is formed by spraying a colorless transparent topcoat on the surface of the fourth front protective layer.

[0014] By adopting the above technical scheme, a surface treatment process setting of five protective layers is adopted for single-color injection molded parts, a material layer and multiple film layers are combined with each other to form a film layer structure, and laser engraving is used to achieve electroplating color when the product is static. When the internal ambient light of the product is turned on, a beam of ambient light can be emitted from the light-transmitting area to present a dynamic surface state, so that single-color injection molded parts can be presented in both electroplating and light-transmitting states, meeting the appearance design requirements of automotive interior and exterior trims.

[0015] Optionally, the material layer is a transparent material, and the material of the material layer is PC or PMMA, which is obtained by injection molding.

[0016] By adopting the above technical solution, the transparent material layer made of PC or PMMA can meet the requirements of mechanical strength and at the same time, when the internal ambient light of the product is turned on, light can pass through the material layer, thereby achieving a light-transmitting effect.

[0017] Optionally, the thickness of the light-shielding black paint of the first front protective layer is controlled between 8 μm and 10 μm.

[0018] Optionally, during the light-shielding black paint spraying process, the oven temperature is set at 65°C-75°C.

[0019] By adopting the above technical solution, the thickness of the light-shielding black paint is controlled between 8μm-10μm, which can effectively block the light, making the pattern effect formed by the transmission of the laser engraved pattern area more significant, at the drying oven temperature;

[0020] The oven temperature is one of the important factors affecting the quality of black paint spraying:

[0021] Cure Speed: The higher the oven temperature, the faster the coating cures. This helps speed up production, especially on continuous production lines.

[0022] Coating quality: The drying oven temperature can affect the leveling and drying degree of the coating. The appropriate temperature can ensure that the coating is uniform and smooth without defects such as pinholes and sagging.

[0023] Coating performance: Too high a temperature may cause excessive internal stress in the coating, affecting the adhesion and durability of the coating. Too low a temperature may cause the coating to not dry sufficiently, affecting its performance.

[0024] Environmental protection and energy consumption: Higher drying oven temperature may increase energy consumption, and also generate more waste gas and waste heat, which will have an impact on the environment. Therefore, it is necessary to comprehensively consider the impact of temperature on coating performance and environmental protection.

[0025] Optionally, the thickness of the second front protective layer and the fourth front protective layer are both controlled between 15 μm and 25 μm, and during UV lamp irradiation, the UV lamp energy is 1000 MJc㎡ / 200 MWc㎡, and the line speed is 40±5 r / Hz.

[0026] Optionally, the thickness of the aluminum film layer of the third front protective layer is controlled between 20nm and 30nm.

[0027] By adopting the above technical solution, the aluminum film layer has high heat reflectivity, which can effectively reduce the conduction of heat, thereby improving the thermal insulation performance of the interior and exterior panels.

[0028] The PVD coating technology used can achieve the mutual fusion of these metal colors and paint colors, thus producing both the luster of metal and the color and highlight effect of paint. The PVD process is environmentally friendly and pollution-free. It is an advanced process that replaces the subsequent metal electroplating process and meets the national requirements for an environmentally friendly society.

[0029] Optionally, the thickness of the fifth front protective layer is controlled between 25 μm and 35 μm, and UV lamp is used for irradiation, the UV lamp energy is 1000 MJc㎡ / 200 MWc㎡, and the line speed is 40±5 r / Hz.

[0030] In summary, the present invention includes at least one of the following beneficial technical effects:

[0031] The present invention can provide a surface treatment process for monochrome injection molded parts to present two states: electroplating and light transmission. The surface treatment process setting adopts a five-layer protective layer for the monochrome injection molded parts, utilizes a material layer and a plurality of film layers to combine with each other in a film layer structure, and utilizes laser engraving to achieve an electroplating color when the product is static. When the internal atmosphere light of the product is turned on, a beam of the atmosphere light can be emitted from the light-transmitting area to present a dynamic surface state, thereby achieving the two states of electroplating and light transmission for the monochrome injection molded parts, and meeting the appearance design requirements of interior and exterior trims of automobiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic flow chart of the surface treatment process of a single-color injection molded part in the present invention in two states: electroplating and light-transmitting;

[0033] Figure 2 It is a schematic diagram of the cross-sectional structure of the automobile interior decoration part of the present invention;

[0034] Explanation of the reference numerals: 1. material layer; 2. first front protective layer; 21. light-transmitting pattern area; 3. second front protective layer; 4. third front protective layer; 5. fourth front protective layer; 6. fifth front protective layer. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0036] The embodiment of the present invention discloses a surface treatment process for a single-color injection molded part presenting two states: electroplating and light-transmitting.

[0037] Reference Figure 1 and Figure 2 , a surface treatment process for a single-color injection molded part presenting two states of electroplating and light transmission, used for manufacturing automobile interior parts in two states of electroplating and light transmission, the automobile interior parts comprising a material layer 1, a first front protection layer 2, a second front protection layer 3, a third front protection layer 4, a fourth front protection layer 5 and a fifth front protection layer 6 are sequentially arranged from bottom to top, and the first front protection layer 2 adopts laser engraving technology to form a light transmission pattern area 21;

[0038] The surface treatment process of automotive interior parts includes the following steps:

[0039] Step 1, obtaining a material layer 1 by injection molding;

[0040] Step 2, the first front protective layer 2 is a light-shielding black paint coating, which is formed by spraying light-shielding black paint on the upper surface of the material layer 1, and then laser engraving a light-transmitting pattern area 21;

[0041] Step 3, the second front protective layer 3 is a UV primer coating, which is formed by UV spraying a primer on the upper surface of the first front protective layer 2;

[0042] Step 4, the third front protective layer 4 is an aluminum film layer, and the aluminum film layer is formed on the upper surface of the second front protective layer 3 by magnetron sputtering;

[0043] Step 5, the fourth front protective layer 5 is a UV paint coating, which is formed by spraying paint on the surface of the third front protective layer 4;

[0044] Step 6: the fifth front protective layer 6 is a topcoat layer, which is formed by spraying a colorless and transparent topcoat on the surface of the fourth front protective layer 5 .

[0045] The surface treatment process setting of five protective layers is adopted for single-color injection molded parts. The material layer 1 and multiple film layers are combined with each other to form a film layer structure, and laser engraving is used to achieve electroplating color when the product is static. When the internal ambient light of the product is turned on, the ambient light beam can be emitted from the light-transmitting area to present a dynamic surface state, so that the color injection molded parts can be presented in both electroplating and light-transmitting states, meeting the appearance design requirements of automotive interior and exterior trims.

[0046] The material layer 1 is a transparent material, and the material of the material layer 1 is PC or PMMA, which is obtained by injection molding.

[0047] The transparent material layer 1 made of PC or PMMA can meet the requirements of mechanical strength and at the same time, when the internal ambient light of the product is turned on, light can pass through the material layer 1, thereby achieving a light-transmitting effect.

[0048] The thickness of the light-shielding black paint of the first front protective layer 2 is controlled between 8 μm and 10 μm.

[0049] During the light-shielding black paint spraying process, the drying oven temperature is set at 65℃-75℃.

[0050] The thickness of the light-shielding black paint is controlled between 8μm-10μm, which can effectively block the light, making the pattern effect formed by the transmission of the laser engraved pattern area more significant, at the drying temperature;

[0051] The oven temperature is one of the important factors affecting the quality of black paint spraying:

[0052] Cure Speed: The higher the oven temperature, the faster the coating cures. This helps speed up production, especially on continuous production lines.

[0053] Coating quality: The drying oven temperature can affect the leveling and drying degree of the coating. The appropriate temperature can ensure that the coating is uniform and smooth without defects such as pinholes and sagging.

[0054] Coating performance: Too high a temperature may cause excessive internal stress in the coating, affecting the adhesion and durability of the coating. Too low a temperature may cause the coating to not dry sufficiently, affecting its performance.

[0055] Environmental protection and energy consumption: Higher drying oven temperature may increase energy consumption, and also generate more waste gas and waste heat, which will have an impact on the environment. Therefore, it is necessary to comprehensively consider the impact of temperature on coating performance and environmental protection.

[0056] The thickness of the second front protective layer 3 and the fourth front protective layer 5 are both controlled between 15 μm and 25 μm. During UV lamp irradiation, the UV lamp energy is 1000 MJc㎡ / 200 MWc㎡, and the line speed is 40±5 r / Hz.

[0057] The thickness of the aluminum film layer of the third front protection layer 4 is controlled between 20nm and 30nm.

[0058] The aluminum film layer has high heat reflectivity, which can effectively reduce heat conduction and thus improve the thermal insulation performance of interior and exterior panels.

[0059] The PVD coating technology used can achieve the mutual fusion of these metal colors and paint colors, thus producing both the luster of metal and the color and highlight effect of paint. The PVD process is environmentally friendly and pollution-free. It is an advanced process that replaces the subsequent metal electroplating process and meets the national requirements for an environmentally friendly society.

[0060] The thickness of the fifth front protective layer 6 is controlled between 25 μm and 35 μm, and the UV lamp is used for irradiation, the UV lamp energy is 1000 MJc㎡ / 200 MWc㎡, and the line speed is 40±5 r / Hz.

[0061] The following is a specific example to illustrate the implementation principle of the surface treatment process of the monochrome injection molded parts in the two states of electroplating and light transmission of the present invention:

[0062] MCHA-6102143 / 77-00ZBF_Left front door center decorative trim - Forged gray silver; MCHA-6102243 / 77-00ZBF_Right front door center decorative trim - Forged gray silver

[0063] The material layer of the product is PC+ABS injection molding, and the surface is (injection molding+spray painting+laser carving+PVD-BYDCP-S75 (forged gray silver)) process;

[0064] The requirements for product surface requirements are as follows:

[0065] There shall be no appearance defects such as burrs, shrinkage, weld lines, ejector pin marks, flashing, deformation, pitting, cracking, oil accumulation, etc.; there shall be no color difference compared with the standard plate, and the laser engraving marks shall not be visible under opaque conditions after laser engraving, and the rest of the area shall not be translucent or leaky;

[0066] The product gate must be trimmed cleanly and should not affect product assembly;

[0067] The painting range must ensure that the entire A surface and the entire side surface are covered;

[0068] The laser engraving line of the product is smooth without any problems such as step difference or sawtooth.

[0069] The light-transmitting area is the same as the non-light-transmitting area when no light is on (single color)

[0070] The width of the light-transmitting lines is consistent (the width tolerance is tentatively set at ±0.15 / / 0.1mm, and the length tolerance is tentatively set at ±0.3);

[0071] The product has no light leakage problem except for the light-transmitting area. The brightness of the light-transmitting area is uniform and meets the light transmittance requirements. The light transmittance requirements are temporarily set at 6 (± 2.0)%, and the haze is 100% (later adjustments will be made according to project requirements before signing the sample);

[0072] The products must be fully inspected before shipment, and there must be no defects that affect the lighting effect, such as uneven light transmittance.

[0073] See Table 1 for surface appearance inspection standards:

[0074] Table 1

[0075]

[0076]

[0077]

[0078]

[0079] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The surface treatment process of single-color injection molded parts presents two states: electroplating and light transmission, characterized in that: Used for manufacturing automobile interior decoration parts in two states, electroplating and light-transmitting, the automobile interior decoration parts comprising a material layer (1), a first front protection layer (2), a second front protection layer (3), a third front protection layer (4), a fourth front protection layer (5) and a fifth front protection layer (6) arranged in sequence from bottom to top, wherein the first front protection layer (2) adopts laser engraving technology to form a light-transmitting pattern area (21); The surface treatment process of automotive interior parts includes the following steps: Step 1, obtaining a material layer (1) by injection molding; Step 2, the first front protective layer (2) is a light-shielding black paint coating, which is formed by spraying light-shielding black paint on the upper surface of the material layer (1), and then laser engraving a light-transmitting pattern area (21); Step 3, the second front protective layer (3) is a UV primer coating, which is formed by UV spraying a primer on the upper surface of the first front protective layer (2); Step 4, the third front protective layer (4) is an aluminum film layer, and the aluminum film layer is formed on the upper surface of the second front protective layer (3) by magnetron sputtering; Step 5, the fourth front protective layer (5) is a UV paint coating, which is formed by spraying paint on the surface of the third front protective layer (4); Step 6: The fifth front protective layer (6) is a topcoat layer, which is formed by spraying a colorless transparent topcoat on the surface of the fourth front protective layer (5).

2. The surface treatment process for a single-color injection molded part showing two states of electroplating and light transmission according to claim 1, characterized in that: The material layer (1) is a transparent material, and the material of the material layer (1) is PC or PMMA, which is obtained by injection molding.

3. The surface treatment process for a single-color injection molded part showing two states of electroplating and light transmission according to claim 1, characterized in that: The thickness of the light-shielding black paint of the first front protective layer (2) is controlled between 8 μm and 10 μm.

4. The surface treatment process for a single-color injection molded part showing two states of electroplating and light transmission according to claim 2, characterized in that: During the light-shielding black paint spraying process, the drying oven temperature is set at 65℃-75℃.

5. The surface treatment process for a single-color injection molded part showing two states of electroplating and light transmission according to claim 1, characterized in that: The thickness of the second front protective layer (3) and the fourth front protective layer (5) are both controlled between 15 μm and 25 μm. During UV lamp irradiation, the UV lamp energy is 1000 MJc㎡ / 200 MWc㎡, and the line speed is 40±5 r / Hz.

6. The surface treatment process for a single-color injection molded part showing two states of electroplating and light transmission according to claim 1, characterized in that: The thickness of the aluminum film layer of the third front protective layer (4) is controlled between 20nm and 30nm.

7. The surface treatment process for a single-color injection molded part showing two states of electroplating and light transmission according to claim 1, characterized in that: The thickness of the fifth front protective layer (6) is controlled between 25 μm and 35 μm, and the UV lamp is used for irradiation, the UV lamp energy is 1000 MJ cm2 / (200) MW cm2, and the line speed is 40±5 r / Hz.

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