Method for preparing vehicle decorative part

Abstract

The present invention belongs to the field of automotive decorative parts manufacturing and relates to a method for preparing automotive decorative parts. This invention utilizes a double-sided PVD process with water-based peelable adhesive to achieve a light-proof and pinhole-free finish. Considering the surface defect morphology and probability of defect overlap on both sides of the plastic part, the double-sided PVD process can fully achieve a light-proof and pinhole-free finish. This not only solves the problem of increased PVD temperature and PC deformation caused by increasing the thickness of the PVD metal coating to achieve light-proof and pinhole-free requirements, but also addresses the environmentally unfriendly and costly problem of adding a solvent-based black covering coating when using a PVD metal coating and a black organic coating for covering.

Description

Technical Field

[0001] The invention belongs to the field of automobile decorative part manufacturing and relates to a method for preparing a vehicle-mounted decorative part. Background Art

[0002] With the increasing demand for PVD luminous products for automotive interior and exterior decoration replacing water electroplating, the local line illumination of luminous products involves the masking of luminous lines or laser engraving. Since the size of the injection molded parts shrinks after injection molding, the luminous lines of the products are masked or the accuracy of laser engraving is reduced, resulting in poor product appearance.

[0003] In order to meet the requirements of PVD light-proof and pinhole-free process in non-luminous areas of transparent plastic parts, there are microscopic defects on the surface of the primer-free base material. Increasing the PVD film-forming time can achieve light-proof process, but cannot solve the pinhole problem; adding organic coating with strong covering power can achieve light-proof and pinhole-free, but also increases production costs.

[0004] There are two common approaches to addressing these issues: one is to increase the thickness of the PVD metal coating to achieve opacity and pinhole-free requirements; the other is to use a PVD metal coating and a black organic coating to cover it, achieving a light-proof and pinhole-free PVD process. However, increasing the PVD coating thickness is difficult to achieve the same thickness as water electroplating. As the PVD coating thickness increases, the PVD temperature rises, and the PC is prone to deformation. Adding a solvent-based black covering coating is not environmentally friendly and increases costs. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a method for preparing a light-proof and pinhole-free vehicle-mounted decorative part with low cost and high efficiency.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A method for preparing a vehicle-mounted decorative part, the method comprising the following steps:

[0008] S1. First, prepare a logo on the back of the PC film, and then prepare a logo on the front of the PC film using a peelable adhesive, wherein the area of the front logo is larger than the back logo;

[0009] S2. Use peelable adhesive to print the logo on the back to the same area as the front, and then perform curing.

[0010] S3, then high pressure forming is performed, followed by double-sided PVD coating;

[0011] S4. Peel off the peelable adhesive on the front and back sides, spray an organic coating on the front and back sides to make an insert injection molding to obtain a decorative part.

[0012] Preferably, the back logo is printed using black ink.

[0013] In the above-mentioned method for preparing a vehicle-mounted decorative part, the peelable adhesive in step S1 is used to prepare a logo peelable adhesive mesh with a mesh size of 50-80.

[0014] The present invention can control the thickness of the peeling adhesive, thereby preventing pinholes from being generated during the leveling and drying process of the peeling adhesive, and ensuring continuous peeling after the peeling adhesive is dried.

[0015] In the above-mentioned method for preparing a vehicle-mounted decorative part, the diameter of the logo prepared by the peelable adhesive in step S1 is 0.5-1.5 mm larger than the diameter of the logo prepared by the film screen in step S1.

[0016] After the 1mm expansion process of the present invention is completed, the double-sided thin adhesive can be peeled off to achieve a 1mm transparent ring in the PVD area and the printed logo area, reducing the process (the traditional process will add a laser engraving 1mm line), and is applied to logo line luminous products.

[0017] In the above-mentioned method for preparing a vehicle-mounted decorative part, the curing temperature in step S2 is 50-80° C. and the curing time is 8-15 minutes.

[0018] The present invention can smoothly peel off the thin adhesive without residue by controlling the curing temperature. If the temperature is too low, the thin adhesive formed by high pressure will be offset, and if the temperature is too high, it will make it difficult for the robot to vacuum absorb and peel it off.

[0019] In the above-mentioned method for preparing a vehicle decorative part, in step S3 , the clamping pressure in the high-pressure molding is 120-120 kgf, the lower mold temperature is 80-100° C., the upper mold temperature is 300-350° C., and the molding holding time is 10-20 seconds.

[0020] In the above-mentioned method for preparing a vehicle-mounted decorative part, the thickness of the PVD coating in step S3 is 150-200 nm.

[0021] Preferably, PVD adopts a rotational magnetron sputtering method: the coating target material adopts one or more of Cr, Al, and Al-Mg alloy.

[0022] Plasma bombardment parameters: bombardment vacuum 8.0E-3Pa; argon 50-150 sccm, bombardment voltage 200V-300V, current 5-10A, bombardment 60-120s;

[0023] Linear ion source PVD coating parameters: coating starting vacuum: 5.0E-3Pa; medium frequency sputtering power supply voltage 550-620V, current 15-20A; working gas Ar flow rate 200-280sccm, sputtering time 30min.

[0024] In the above-mentioned method for preparing a vehicle decorative part, step S4 uses vacuum adsorption to peel off the peelable adhesive on the front and back surfaces. The present invention uses vacuum adsorption to peel off, avoiding manual operation that may cause dirt or scratches on the PVD surface, and can greatly improve the first-pass yield of the product.

[0025] In the above-mentioned method for preparing a vehicle-mounted decorative part, in the vacuum adsorption method in step S4, the diameter of the vacuum suction head is 5-8 mm, and the adsorption pressure is less than -0.45 MPa.

[0026] Preferably, in the vacuum adsorption method, the diameter of the robot vacuum tip is 5-8 mm, the adsorption pressure is less than -0.45 MPa, and the adhesive is peeled in one direction along the stripping adhesive logo. When the tip adsorbs the thin adhesive, it is prevented from touching the PVD area.

[0027] In the above-mentioned method for preparing a vehicle decorative part, the organic coating in step S4 includes any one of UV light curing protective paint KCC-KUT10000, UV light curing protective paint UVHC5000, and Maitu 587C2.

[0028] After the double-sided thin adhesive logo of the present invention is peeled off, hundreds of nanometers of PVD coating are exposed to the environment and are easily scratched and corroded. The purpose of double-sided spraying of organic coating is to protect the PVD coating while meeting the environmental test requirements of automotive exterior parts.

[0029] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts a double-sided PVD light-proof and pinhole-free process with water-based peelable adhesive. Considering the surface defect morphology and defect overlap probability of both sides of the plastic part, the double-sided PVD can completely achieve a light-proof and pinhole-free process. It not only solves the problem of the PVD temperature increase and easy deformation of PC caused by increasing the thickness of the PVD metal coating to meet the requirements of light-proof and pinhole-free, but also solves the problem of the environmentally unfriendly cost increase of adding a solvent-based black covering coating caused by the use of PVD metal coating and black organic coating for covering. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of film preparation in Example 1 of the present invention; 1. Black printed film on the back; 2. 1mm peelable film printed on the front; 3. 1mm linear luminous peelable film printed on the back.

[0031] Figure 2 Schematic diagram of the logo printing cross section in Example 1 of the present invention; 4. PC diaphragm; 5. Two black printings of the "VW" logo on the back.

[0032] Figure 3 Schematic diagram of the front-side outward expansion cross-section in Example 1 of the present invention; 4. PC diaphragm; 5. Two black printings of the "VW" logo on the back; 6. 1mm outward expansion of the "VW" logo on the front with peelable adhesive printing.

[0033] Figure 4 This is a schematic cross-sectional view of the printed luminous wire body with peelable adhesive in Example 1 of the present invention;

[0034] 4. PC diaphragm; 5. Two black lines of "VW" logo printed on the back; 6. Front expansion

[0035] 1mm "VW" logo printed on peelable adhesive; 7. 1mm peelable adhesive luminous line printed on the back.

[0036] Figure 5 Schematic diagram of the cross-section of the double-sided PVD coating in Example 1 of the present invention; 4. PC diaphragm; 5. Two black printings of the "VW" logo on the back; 6. 1mm peelable adhesive printing of the "VW" logo on the front; 7. 1mm peelable adhesive luminous line printing on the back; 8. Double-sided PVD coating.

[0037] Figure 6 This is a schematic cross-sectional view of the peelable adhesive after PVD in Example 1 of the present invention.

[0038] Figure 7 This is a schematic cross-sectional view of Example 1 of the present invention, in which the double-sided peelable adhesive is peeled off, sprayed with transparent varnish on both sides, and then molded into inserts. 9. Double-sided thermosetting UV light-curing protective paint.

[0039] Figure 8 This is a schematic diagram of the coating structure of the product in Example 1 of the present invention, 1. PC substrate; 2. Protective paint; 3. PVD; 4. PC film; 5. Black logo printing; 6. PVD; 7. Protective paint.

[0040] Figure 9 This is a schematic diagram of the preparation process of Example 1 of the present invention. DETAILED DESCRIPTION

[0041] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0042] Example 1:

[0043] S1. According to Figure 9 The preparation process shown is to first use the film screen to make the logo ( Figure 1-1 ), combined with the line width (1mm), the output front side can be peeled off and masked with 1mm film stencil ( Figure 1-2 ), backside peelable adhesive 1mm line width masking film screen ( Figure 1-3 ) The peelable plastic mesh requires a mesh size of 60;

[0044] S2. According to Figure 2The PC film shown has two black logos printed on it. After the two black inks are printed and cured, both sides are covered with a non-residue protective film to protect the cleanliness of the substrate.

[0045] S3. According to Figure 3 As shown in the double-sided peelable adhesive printing, two black printing sides (back side) are printed with 1mm (1mm line width film) luminous lines along the black printing edge, and the front side is printed with a 1mm peelable adhesive screen with an outward expansion of 1mm. Figure 4 The CCD positioning of the front and back peelable adhesive edges during printing is shown; the peelable adhesive printing curing temperature is 60℃ and baked for 10 minutes;

[0046] S4, high-pressure molding with peelable adhesive, keep the mold and molding environment clean, and filter the cooling air during high-pressure molding; then punching, remove burrs on the edges after punching, and pack the finished products into plastic bags;

[0047] S5. According to Figure 5 Adjust the stable PVD opaque process parameters (40KW magnetron sputtering PVD (Al) 10min), and perform double-sided PVD on the product after forming and punching;

[0048] S6, then follow Figure 6 Double-sided peelable adhesive is peeled off by vacuum adsorption method and automatically peeled off by robot. Figure 7 Double-sided thermosetting UV light curing protective paint KCC-KUT10000, insert injection molding Figure 8 The vehicle trim shown.

[0049] In summary, the present invention uses a double-sided PVD light-proof and pinhole-free process with water-based peelable glue. Considering the surface defect morphology and defect overlap probability of both sides of the plastic part, the double-sided PVD can completely achieve a light-proof and pinhole-free process. It not only solves the problem of increasing the thickness of the PVD metal coating to meet the requirements of light-proof and pinhole-free, which causes the PVD temperature to rise and the PC to be easily deformed, but also solves the problem of the environmentally unfriendly cost increase of adding a solvent-based black covering coating caused by the use of PVD metal coating and black organic coating for covering.

[0050] The parts of the embodiment herein that are not exhaustive of the midpoint values of the technical scope claimed for protection by the present invention and the new technical solutions formed by equivalent replacement of single or multiple technical features in the technical solutions of the embodiments are also within the scope claimed for protection by the present invention; at the same time, in all the embodiments listed or not listed in the solutions of the present invention, each parameter in the same embodiment merely represents an example of its technical solution (i.e., a feasible solution), and there is no strict coordination and limitation relationship between the parameters, wherein the parameters can be replaced with each other without violating the axioms and the claims of the present invention, unless otherwise stated.

[0051] The technical means disclosed in the solutions of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical solutions composed of any combination of the above technical features. The above is a specific embodiment of the present invention. It should be noted that for those skilled in the art, various improvements and modifications can be made without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

[0052] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A method for preparing a vehicle-mounted decorative part, characterized in that: The method comprises the following steps: S1. First, make a logo on the back of the PC film using a film stencil, and then make a logo on the front of the PC film using a peelable adhesive. The logo made with the peelable adhesive should be 0.5-1.5mm larger in diameter than the logo made with the film stencil. S2. Use peelable adhesive to print the logo on the back to the same area as the front, and then perform curing. S3, then high pressure forming is performed, followed by double-sided PVD coating; S4. Peel off the peelable adhesive on the front and back sides, spray an organic coating on the front and back sides to make an insert injection molding to obtain a decorative part.

2. The method for preparing a vehicle-mounted decorative part according to claim 1, characterized in that: Step S1: Prepare the logo by peeling adhesive. The peeling adhesive screen has a mesh size of 50-80.

3. The method for preparing a vehicle-mounted decorative part according to claim 1, characterized in that: The curing temperature in step S2 is 50-80° C. and the curing time is 8-15 minutes.

4. The method for preparing a vehicle-mounted decorative part according to claim 1, wherein: In step S3, the high-pressure molding is performed with a mold clamping pressure of 120-120 kgf, a lower mold temperature of 80-100° C., an upper mold temperature of 300-350° C., and a molding holding time of 10-20 seconds.

5. The method for preparing a vehicle-mounted decorative part according to claim 1, characterized in that: The thickness of the PVD coating in step S3 is 150-200 nm.

6. The method for preparing a vehicle-mounted decorative part according to claim 1, characterized in that: In step S4, the peelable adhesive on the front and back sides is peeled off by vacuum adsorption.

7. The method for preparing a vehicle-mounted decorative part according to claim 1, characterized in that: The organic coating in step S4 includes any one of UV light curing protective paint KCC-KUT10000, UV light curing protective paint UVHC5000, and Maitu 587C2.

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