Surface coating process for exterior trimming part of carbon fiber automobile rearview mirror

Abstract

The invention discloses a carbon fiber automobile rearview mirror exterior trimming part surface coating process which comprises two modes of an autoclave interior coating process, an autoclave molding process after spraying and pasting in a mold and a mold pressing mold interior coating process, powder coating is carried out in the mold, then mold closing is carried out for curing molding, and finally polishing and paint spraying treatment is carried out. Polishing, soil supplementing and paint spraying are carried out repeatedly for at least three times according to the original coating process, however, only one-time polishing and one-time paint spraying need to be carried out after spraying in an autoclave mold or spraying in a mold pressing mold in the latest process, and labor and material cost is saved.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber automotive exterior coating technology, and particularly to a carbon fiber automotive rearview mirror exterior coating process. Background Technology

[0002] With the booming development of pure electric vehicles, lightweighting is receiving increasing attention and favor from the pure electric vehicle industry due to limitations in battery structure and performance. Carbon fiber composite materials are also being used more and more in electric vehicles due to their lightweight and high strength characteristics.

[0003] Carbon fiber, as a new material, is increasingly widely used in new energy vehicles, and it is lighter than traditional metal parts. Currently, the coating process for carbon fiber automotive rearview mirror exterior parts is relatively simple, consisting of sanding, puttying, painting, and polishing. During sanding, differences in operator skill can lead to over-sanding, resulting in scrap and increased costs. Due to the material's characteristics, the surface has many tiny pinholes, requiring puttying. Puttying involves filling these pinholes with epoxy transparent resin to eliminate them after painting. However, sanding after puttying is very difficult because the putty is quite hard, making sanding labor-intensive and prone to over-sanding. Before the pinholes are completely filled, painting requires a three-step cycle of sanding, puttying, and painting, resulting in high production costs and low efficiency. If putty accumulates during the puttying process, black spots will appear on the surface, affecting quality. In summary, it is necessary to develop new coating methods and processes. Compared with traditional carbon fiber exterior coating processes, new coating processes are more efficient, have a higher pass rate, better surface quality, and lower production costs. Summary of the Invention

[0004] The purpose of this invention is to provide an autoclave coating process for carbon fiber automotive rearview mirror exterior parts, in order to solve the surface quality problems such as pinholes and dry sand that are easily generated during the coating process of carbon fiber automotive rearview mirror exterior parts, thereby reducing the number of coating sprays and improving the surface quality of the product after coating.

[0005] To address the aforementioned technical problems, this invention provides an autoclave coating process for carbon fiber automotive rearview mirror exterior parts. The process involves spraying the coating within a mold, followed by application and autoclave molding, and includes the following steps: Step A: Mold cleaning. Clean the mold in a clean spray booth. Step B: Apply release agent. Pour the release agent onto a scouring pad and wipe the molded surface of the mold from top to bottom and from left to right, ensuring that the glossy areas are completely wiped and covered. Step C: Check the release effect. Stick masking tape to the forming surface of the mold, and then pull the masking tape. If there is a certain amount of adhesion but no obvious tearing force, it means that the amount of release agent is appropriate. If the tearing force is too great or there is no adhesion, it means that the amount of release agent is too little or too much, and the amount of release agent needs to be adjusted. Step D: In-mold painting, paint is sprayed into the mold using a spray gun to form a continuous gel coat coating on the molding surface. The thickness of the gel coat coating is controlled at 60-80 micrometers. Step E: Gelcoat coating baking. After the paint is applied, the gelcoat coating is flash-dried for 5-10 minutes and then baked in an oven at 60°C for 60 minutes. Step F: Finger inspection of gel coat coating. Press the surface of the gel coat coating with your finger. If there is a slight fingerprint and no sticky feeling, it is acceptable. Step G: Carbon cloth laying. When the mold cools down to 40°C, the carbon cloth is laid in the laying chamber. The carbon cloth of the rearview mirror exterior trim is laid layer by layer in the mold. After laying, the surface is compacted and then vacuum is applied. The vacuum pressure is 1.0 to 1.1 bar. Step H: Constant temperature curing. After the paving is completed, it is sent to a hot autoclave for vacuum curing at a constant temperature of 150℃ for 4 hours. Step 1: Demolding and polishing. After the rearview mirror exterior trim is demolded, it is polished. Step J: Surface cleaning. After sanding, first clean the surface with an air gun, and then use a wiping agent to further clean the surface. Step K: Surface painting. Use a spray gun to spray the surface of the rearview mirror exterior parts. Spray from top to bottom and from left to right, observing the process as you go. Step L: Paint film baking. After the paint film is sprayed, flash dry for 10 minutes, then put it into the oven for baking at 80℃ for 60 minutes. Step M: Paint film polishing. The polishing process is as follows: First, use 1500-grit wet sandpaper to sand the surface. After sanding, wipe the surface clean with a cloth. Then, use 3M coarse polishing wax with a wool wheel for initial polishing, controlling the speed at about 2000 rpm. Next, use 2000-grit wet sandpaper for medium polishing. Finally, use 3000-grit wet sandpaper for sanding and 3M fine polishing wax with a sponge wheel for fine polishing. Step N: Inspect the packaging.

[0006] Preferably, the specific cleaning process in step A is to blow the mold surface clean with an air gun, and then wipe the mold with alcohol or wiping agent S6-1.

[0007] Preferably, in step D, when spraying paint inside the mold, the thickness of the gel coat coating on the inner edge of the mold needs to be controlled; and the spraying process adopts a small spray width and multiple thin sprays, controlling the air pressure to 0.3-0.5 MPa, the gun speed to 200-300 mm / s, and the gun distance to 150-250 mm.

[0008] Preferably, the polishing in step I involves first performing sandblasting at a pressure of 0.6 MPa using brown corundum as the material, and then sandblasting the surface of the rearview mirror exterior parts sequentially; followed by polishing with 600-grit sandpaper and 800-grit sponge sandpaper.

[0009] Preferably, in step K, the spraying pressure is controlled at 0.4–0.6 MPa, the gun speed is 200–300 mm / s, and the gun distance is 150–250 mm.

[0010] This invention also provides an in-mold coating process for carbon fiber automotive rearview mirror exterior parts, which involves powder coating inside a mold, followed by mold closing and curing, and finally sanding and painting; including the following steps: Step a: Adjust the mold, and after closing the two separate molds, check the mold closing position and sealing performance; Step b: Mold cleaning. Clean the mold in a clean spray booth. Step c: Carbon fiber pre-application, the carbon fiber of the rearview mirror exterior trim is laid and positioned on the silicone mold; Step d: Spray release agent. Use an electrostatic spray gun to spray the forming surface of the mold, and the glossy areas need to be completely covered by the spray agent. Step e: Check the release effect. Stick masking tape to the forming surface of the mold, and then pull the masking tape. If there is a certain amount of adhesion but no obvious tearing force, it means that the amount of release agent is appropriate. If the tearing force is too great or there is no adhesion, it means that the amount of release agent is too little or too much, and the amount of release agent needs to be adjusted. Step f: Spray powder. Use an electrostatic spray gun to spray the inside of the mold from top to bottom and from left to right until the glossy surface of the molded surface is completely covered with resin gel coat. Step g: Mold closing. After the resin gel coat layer is sprayed, it is in a liquid state. Immediately place the silicone mold into the mold and close the mold. Step h: Cross-linking and curing. After the mold is closed, air is introduced to tightly bond the mold and carbon cloth together. The resin gel coat layer undergoes cross-linking and curing reaction inside the mold and mixes with the epoxy resin on the surface of the carbon cloth of the rearview mirror exterior trim. Step i: Demolding, open the mold after 20 minutes, and observe the condition of the exterior trim of the rearview mirror; Step j: Grinding. First, sandblasting is performed at a pressure of 0.6 MPa using brown corundum. The surface of the rearview mirror exterior trim is sandblasted sequentially. Then, it is polished by passing it through 600-grit sandpaper and 800-grit sponge sandpaper. Step k: Surface cleaning. After sanding, first clean the surface with an air gun, and then use a wiping agent to further clean the surface. Step 1: Use a spray gun to spray the surface of the rearview mirror exterior trim. Spray from top to bottom and from left to right, observing the process as you spray. Step m: Paint film baking. After the paint film is sprayed, flash dry for 10 minutes, then put it into the oven for baking at 80℃ for 60 minutes. Step n: Paint film polishing. The polishing process is as follows: First, use 1500-grit wet sandpaper to sand the surface. After sanding, wipe the surface clean with a cloth. Then, use 3M coarse polishing wax with a wool wheel for initial polishing, controlling the speed at about 2000 rpm. Next, use 2000-grit wet sandpaper for medium polishing. Finally, use 3000-grit wet sandpaper for sanding and 3M fine polishing wax with a sponge wheel for fine polishing. Step o: Inspect the packaging.

[0011] Preferably, in step d, the voltage of the electrostatic spray gun is 60-90KV, the current is 10-20uA, the atomization pressure is controlled at 0.30-0.45Mpa, and the spray pattern is fan-shaped.

[0012] Preferably, in step 1, the spraying pressure is controlled at 0.4-0.6 MPa, the gun speed is 200-300 mm / s, and the gun distance is 150-250 mm.

[0013] Compared with the prior art, the beneficial effects of the present invention are: In-mold spraying in autoclave: 1. In-mold spraying in an autoclave can fill the porosity inside the carbon cloth on the mold, reducing pinholes on the surface of the material.

[0014] 2. After the product is formed by spraying in the autoclave, it only needs to be sandblasted to make the surface rough. Then, the release agent on the surface of the product is removed before painting.

[0015] 3. After in-mold spraying in the autoclave, there are almost no obvious pinholes on the product surface, which can eliminate the need for the puttying process and reduce production costs.

[0016] 4. The original painting process required sanding, patching, and painting at least three times. However, the latest process, which involves in-mold spraying from an autoclave, only requires one sanding and one painting, saving labor and material costs.

[0017] 5. The film thickness after in-mold spraying in the autoclave can meet the requirements for polishing, and the overall film thickness can reach more than 100 micrometers, while the normal coating process is prone to missed spots after polishing.

[0018] 6. The thicker film thickness after in-mold spraying in the autoclave reduces over-scraping during polishing, thus improving polishing quality.

[0019] In-mold spraying: 1. Efficiency is improved. In-mold spraying is faster than autoclave spraying and can fill the porosity of the product surface, reducing pinholes.

[0020] 2. Molding and in-mold spraying results in a thicker film after spraying, which reduces over-sanding during the polishing process and improves polishing quality.

[0021] 3. The original painting process required sanding, filling, and painting, repeating the process at least three times. However, the latest process, which involves in-mold spraying, only requires sanding and painting once, saving labor and material costs.

[0022] 4. After molding and in-mold spraying, the film thickness can meet the requirements for polishing, and the overall film thickness can reach more than 100 micrometers. In contrast, the normal coating process is prone to missed spots after spraying and polishing.

[0023] 5. After the product is molded and sprayed, it only needs to be sandblasted to make the surface rough. Then, the release agent on the surface of the product is removed before painting. Detailed Implementation

[0024] The following specific embodiments provide a further detailed description of the present invention. The advantages and features of the present invention will become clearer from the following description and claims.

[0025] The features, operations, and characteristics described in this specification can be combined in any suitable manner to form various embodiments. Similarly, the steps or actions described in the method can be rearranged in a manner readily apparent to those skilled in the art. Therefore, the various orders in the specification are merely for the purpose of clearly describing a particular embodiment and are not necessarily so, unless otherwise stated that a particular order must be followed.

[0026] Example 1 This invention provides a process for autoclaving coating of carbon fiber automotive rearview mirror exterior parts. The coating is applied in an in-mold followed by lamination and then autoclaving. The process includes the following steps: Step A: Mold cleaning. Clean the mold in a clean spray booth (cleanliness level 100,000) to remove mold release agent, impurities, oil stains, etc. from the surface. The result should be visually glossy. Step B: Apply release agent. Pour the release agent onto a scouring pad and wipe the molded surface of the mold from top to bottom and from left to right, ensuring that the glossy areas are completely covered. In this embodiment, the release agent used is Henkel's 55NC model.

[0027] Step C: Check the release effect. Stick masking tape to the forming surface of the mold, and then pull the masking tape. If there is a certain amount of adhesion but no obvious tearing force, it means that the amount of release agent is appropriate. If the tearing force is too great or there is no adhesion, it means that the amount of release agent is too little or too much, and the amount of release agent needs to be adjusted. Step D: In-mold painting, paint is sprayed into the mold using a spray gun to form a continuous gel coat coating on the molding surface. The thickness of the gel coat coating is controlled at 60-80 micrometers. Step E: Gelcoat coating baking. After the paint is applied, the gelcoat coating is flash-dried for 5-10 minutes and then baked in an oven at 60°C for 60 minutes. Step F: Finger inspection of gel coat coating. Press the surface of the gel coat coating with your finger. If there is a slight fingerprint and no sticky feeling, it is acceptable. Step G: Carbon fiber cloth application. When the mold cools down to 40℃, proceed with the application in the application chamber. Apply the carbon fiber cloth for the rearview mirror exterior trim layer by layer into the mold. After application, compact the surface and then apply a vacuum at a pressure of 1.0 to 1.1 bar. Note that the carbon fiber cloth needs to be aligned with the mold before application to prevent it from being peeled off if it is misaligned. The application must be completed successfully in one go. Do not peel it off and reapply it, as this will affect the appearance.

[0028] Step H: Constant temperature curing. After the paving is completed, it is sent to a hot autoclave for vacuum curing at a constant temperature of 150℃ for 4 hours. Step 1: Demolding and polishing. After the rearview mirror exterior trim is demolded, it is polished. Step J: Surface cleaning. After sanding, first clean the surface with an air gun, and then use a wiping agent to further clean the surface. Step K: Surface painting. Use a spray gun to spray the surface of the rearview mirror exterior parts. Spray from top to bottom and from left to right, observing the process as you go. Step L: Paint film baking. After the paint film is sprayed, flash dry for 10 minutes, then put it into the oven for baking at 80℃ for 60 minutes. Step M: Paint film polishing. The polishing process is as follows: First, use 1500-grit wet sandpaper to sand the surface. After sanding, wipe the surface clean with a cloth. Then, use 3M coarse polishing wax with a wool wheel for initial polishing, controlling the speed at about 2000 rpm. Next, use 2000-grit wet sandpaper for medium polishing. Finally, use 3000-grit wet sandpaper for sanding and 3M fine polishing wax with a sponge wheel for fine polishing. Step N: Inspect the packaging.

[0029] Specifically, the cleaning process in step A involves blowing the mold surface clean with an air gun, and then wiping the mold with alcohol or wiping agent S6-1. The purpose is to remove oily substances and residual mold release agent from the surface until the mold surface reaches a glossy state and there are no obvious impurities on the mold surface.

[0030] Specifically, in step D, when spraying paint inside the mold, the thickness of the gel coat coating on the inner edge of the mold needs to be controlled; and the spraying process adopts a small spray width and multiple thin sprays, controlling the air pressure to 0.3-0.5 MPa, the gun speed to 200-300 mm / s, and the gun distance to 150-250 mm.

[0031] Specifically, in step I, the polishing process first involves sandblasting at a pressure of 0.6 MPa using brown corundum as the material, and then sanding the surface of the rearview mirror exterior parts sequentially. Subsequently, the surface is polished by passing 600-grit sandpaper and 800-grit sponge sandpaper.

[0032] Specifically, in step K, the spraying pressure is controlled at 0.4–0.6 MPa, the gun speed is 200–300 mm / s, and the gun distance is 150–250 mm.

[0033] The advantages of autoclave in-mold spraying compared to traditional coating processes are: 1. In-mold spraying in an autoclave can fill the porosity inside the carbon cloth on the mold, reducing pinholes on the surface of the material.

[0034] 2. After the product is formed by spraying in the autoclave, it only needs to be sandblasted to make the surface rough. Then, the release agent on the surface of the product is removed before painting.

[0035] 3. After in-mold spraying in the autoclave, there are almost no obvious pinholes on the product surface, which can eliminate the need for the puttying process and reduce production costs.

[0036] 4. The original painting process required sanding, patching, and painting at least three times. However, the latest process, which involves in-mold spraying from an autoclave, only requires one sanding and one painting, saving labor and material costs.

[0037] 5. The film thickness after in-mold spraying in the autoclave can meet the requirements for polishing, and the overall film thickness can reach more than 100 micrometers, while the normal coating process is prone to missed spots after polishing.

[0038] 6. The thicker film thickness after in-mold spraying in the autoclave reduces over-scraping during polishing, thus improving polishing quality.

[0039] Example 2 This invention also provides an in-mold coating process for carbon fiber automotive rearview mirror exterior parts, which involves powder coating inside a mold, followed by mold closing and curing, and finally sanding and painting; including the following steps: Step a: Adjust the mold, and after closing the two separate molds, check the mold closing position and sealing performance; Step b: Mold cleaning. Clean the mold in a clean spray booth (with a cleanliness level of 100,000) to remove mold release agent, impurities, oil stains, etc. from the surface. The result should be visually glossy. Step c: Carbon fiber pre-application, the carbon fiber of the rearview mirror exterior trim is laid and positioned on the silicone mold; Step d: Spray release agent. Use an electrostatic spray gun to spray the forming surface of the mold, and the glossy areas need to be completely covered by the spray agent. Step e: Check the release effect. Stick masking tape to the forming surface of the mold, and then pull the masking tape. If there is a certain amount of adhesion but no obvious tearing force, it means that the amount of release agent is appropriate. If the tearing force is too great or there is no adhesion, it means that the amount of release agent is too little or too much, and the amount of release agent needs to be adjusted. Step f: Spray powder. Use an electrostatic spray gun to spray the inside of the mold from top to bottom and from left to right until the glossy surface of the molded surface is completely covered with resin gel coat. Step g: Mold closing. The sprayed resin gel coat layer is in a liquid state. Immediately place the silicone mold into the mold and close the mold. Due to the mold structure, the upper resin gel coat layer will flow downwards, eventually causing local sagging. Therefore, after spraying, the silicone mold must be placed in immediately and the mold closed.

[0040] Step h: Cross-linking and curing. After the mold is closed, air is introduced to tightly bond the mold and carbon cloth together. The resin gel coat layer undergoes cross-linking and curing reaction inside the mold and mixes with the epoxy resin on the surface of the carbon cloth of the rearview mirror exterior trim. Step i: Demolding, open the mold after 20 minutes, and observe the condition of the exterior trim of the rearview mirror; Step j: Grinding. First, sandblasting is performed at a pressure of 0.6 MPa using brown corundum. The surface of the rearview mirror exterior trim is sandblasted sequentially. Then, it is polished by passing it through 600-grit sandpaper and 800-grit sponge sandpaper. Step k: Surface cleaning. After sanding, first clean the surface with an air gun, and then use a wiping agent to further clean the surface. Step 1: Use a spray gun to spray the surface of the rearview mirror exterior trim. Spray from top to bottom and from left to right, observing the process as you spray. Step m: Paint film baking. After the paint film is sprayed, flash dry for 10 minutes, then put it into the oven for baking at 80℃ for 60 minutes. Step n: Paint film polishing. The polishing process is as follows: First, use 1500-grit wet sandpaper to sand the surface. After sanding, wipe the surface clean with a cloth. Then, use 3M coarse polishing wax with a wool wheel for initial polishing, controlling the speed at about 2000 rpm. Next, use 2000-grit wet sandpaper for medium polishing. Finally, use 3000-grit wet sandpaper for sanding and 3M fine polishing wax with a sponge wheel for fine polishing. Step o: Inspect the packaging.

[0041] Specifically, in step d, the voltage of the electrostatic spray gun is 60-90KV, the current is 10-20uA, the atomization pressure is controlled at 0.30-0.45Mpa, and the spray pattern is fan-shaped.

[0042] Specifically, in step 1, the spraying pressure is controlled at 0.4-0.6 MPa, the gun speed is 200-300 mm / s, and the gun distance is 150-250 mm.

[0043] The advantages of in-mold spraying compared to traditional coating processes are: 1. Efficiency is improved. In-mold spraying is faster than autoclave spraying and can fill the porosity of the product surface, reducing pinholes.

[0044] 2. Molding and in-mold spraying results in a thicker film after spraying, which reduces over-sanding during the polishing process and improves polishing quality.

[0045] 3. The original painting process required sanding, filling, and painting, repeating the process at least three times. However, the latest process, which involves in-mold spraying, only requires sanding and painting once, saving labor and material costs.

[0046] 4. After molding and in-mold spraying, the film thickness can meet the requirements for polishing, and the overall film thickness can reach more than 100 micrometers. In contrast, the normal coating process is prone to missed spots after spraying and polishing.

[0047] 5. After the product is molded and sprayed, it only needs to be sandblasted to make the surface rough. Then, the release agent on the surface of the product is removed before painting.

[0048] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A process for the surface hot tank coating of carbon fiber automotive rear view mirror exterior trim parts, characterized in that, After spraying in the mold, the following steps are taken for the post-laying hot tank molding, including the following steps: Step A: mold cleaning, clean the mold in a clean spray room; Step B: apply release agent, pour the release agent on the scrubbing cloth, and wipe the molding surface of the mold in the order of from top to bottom and from left to right, and the bright area needs to be completely wiped and covered; Step C: check the release effect, stick the masking tape to the molding surface of the mold, then pull the masking tape, if there is a certain adhesion but no obvious tearing force, it indicates that the amount of release agent is moderate; if the tearing force is too large or there is no adhesion, it indicates that the amount of release agent is too little or too much, and the amount of release agent needs to be adjusted; Step D: in-mold painting, use a spray gun to spray paint into the mold, and form a continuous gel coat layer on the molding surface, the thickness of the gel coat layer is controlled at 60-80 microns; Step E: gel coat baking, after the painting is completed, the gel coat layer is flash dried for 5-10 minutes, and then is put into the baking oven for baking, the temperature of the baking oven is 60°C, and the baking time is 60 minutes; Step F: gel coat finger test, press the surface of the gel coat layer with fingers, there is a slight finger print, and there is no sticky feeling; Step G: carbon cloth laying, when the mold is cooled to 40°C, the laying room is entered for laying; the carbon cloth of the rearview mirror outer trim part is laid layer by layer in the mold, after the laying is completed, the surface is compacted and then vacuum is extracted, the vacuum pressure is 1.0-1.1 bar; Step H: constant temperature curing, after the laying is completed, the hot tank is entered for vacuum extraction and constant temperature curing, the curing temperature is 150°C, and the time is 4 hours; Step I: demolding and polishing, after the molding is completed, the rearview mirror outer trim part is demolded and polished; Step J: surface cleaning, after the polishing is completed, the surface is first cleaned with an air gun, and then further cleaned with a wiping agent; Step K: surface painting, the surface of the rearview mirror outer trim part is painted with a spray gun, the painting is carried out in the order of from top to bottom and from left to right, and the painting is observed at the same time; Step L: paint film baking, after the paint film is sprayed, it is flash dried for 10 minutes, and then is put into the oven for baking, the baking temperature is 80°C, and the time is 60 minutes; Step M: paint film polishing, the polishing process is as follows: first, 1500 mesh water sandpaper is used for polishing, after the polishing, the surface is wiped clean with a cloth; then, 3M polishing coarse wax is used in combination with a wool wheel for initial polishing, the speed is controlled at about 2000 rpm; then, 2000 mesh water sandpaper is used for intermediate polishing, and finally, 3000 mesh water sandpaper is used for polishing, and 3M fine wax is used in combination with a sponge wheel for fine polishing; Step N: inspection and packaging.

2. A process for the surface hot tank coating of carbon fiber automotive rear view mirror exterior components according to claim 1, characterized in that, The specific cleaning process of Step A is to blow the surface of the mold clean with an air gun, and then wipe the mold with alcohol or a wiping agent S6-1.

3. A process for the surface hot tank coating of carbon fiber automotive rear view mirror exterior components according to claim 1, characterized in that, When the in-mold painting of Step D is carried out, the thickness of the gel coat layer on the edge of the mold needs to be controlled; and during the painting process, small spraying range and multiple thin spraying are adopted, the air pressure is controlled at 0.3-0.5 Mpa, the gun speed is 200-300 mm / s, and the gun distance is 150-250 mm.

4. A process for the surface hot tank coating of carbon fiber automotive rear view mirror exterior components according to claim 1, characterized in that, The polishing in the step I is first sand blasting treatment, sand blasting pressure is 0.6 Mpa, material is brown corundum, and the surface of the rearview mirror outer trim part is sequentially sanded; then sequentially through 600 mesh sandpaper and 800 mesh sponge sand for polishing.

5. A process for the surface hot tank coating of carbon fiber automotive rear view mirror exterior components according to claim 1, characterized in that, The paint spraying pressure in the step K is controlled at 0.4-0.6 Mpa, the gun speed is 200-300 mm / s, and the gun distance is 150-250 mm.

6. A process for in-mold coating of a carbon fiber automotive rearview mirror exterior part surface molding, characterized by, After the powder coating is performed in the mold, the mold is closed to perform curing forming, and finally polishing and paint spraying treatment are performed; including the following steps: Step a: adjusting the mold, checking the mold closing position and sealing performance after the two separated molds are closed; Step b: mold cleaning, the mold is cleaned in a clean spray room; Step c: carbon cloth pre-pasting, the carbon cloth of the rearview mirror outer trim part is pasted and positioned on the silica gel mold; Step d: spraying release agent, the forming surface of the mold is sprayed by using an electrostatic spray gun, and the bright area needs to be completely sprayed and covered; Step e: checking the release effect, the masking tape is adhered to the forming surface of the mold, then the masking tape is pulled, if there is a certain adhesion but no obvious tearing force, it indicates that the amount of release agent is moderate; if the tearing force is too large or there is no adhesion, it indicates that the amount of release agent is too little or too much, and the amount of release agent needs to be adjusted; Step f: spraying powder, the mold is sprayed by using an electrostatic spray gun in the order of from top to bottom and from left to right until the resin gel coat layer completely covers the bright surface of the forming surface; Step g: closing the mold, the resin gel coat layer after spraying is in liquid state, the silica gel mold is immediately put into the mold, and the mold is closed; Step h: cross-linking and curing, after the mold is closed, inflation is started, the mold and the carbon cloth are tightly adhered together, the resin gel coat layer performs cross-linking and curing reaction in the mold, and mixes and reacts with the epoxy resin on the surface of the carbon cloth of the rearview mirror outer trim part; Step i: demolding, the mold is opened after 20 min, and the state of the surface of the rearview mirror outer trim part is observed; Step j: polishing, first sand blasting treatment is performed, sand blasting pressure is 0.6 Mpa, material is brown corundum, and the surface of the rearview mirror outer trim part is sequentially sanded; then sequentially through 600 mesh sandpaper and 800 mesh sponge sand for polishing; Step k: surface cleaning, after the polishing is completed, the surface is first cleaned by using an air gun, and then the surface is further cleaned by using a wiping agent; Step l: the surface of the rearview mirror outer trim part is sprayed by using a spray gun, and the spraying is sequentially performed in the order of from top to bottom and from left to right, and the spraying is observed; Step m: paint film baking, after the paint film is sprayed, flash drying is performed for 10 min, the paint film is sent into an oven for baking, the baking temperature is 80℃, and the time is 60 min; Step n: paint film polishing, the polishing process is that first 1500 mesh water sandpaper is used for polishing, after the polishing, the surface is wiped clean by using a cloth; then 3M polishing coarse wax is used for initial polishing with a wool wheel, the speed is controlled at about 2000 r / min; then 2000 mesh water sandpaper is used for middle polishing, finally 3000 mesh water sandpaper is used for polishing, and 3M fine wax is used for fine polishing with a sponge wheel; Step o: inspection and packaging.

7. A surface molding in-mold coating process for carbon fiber automotive rearview mirror exterior components as claimed in claim 6, wherein, The voltage of the electrostatic spray gun in step d is 60-90KV, the current is 10-20uA, the atomization pressure is controlled at 0.30-0.45Mpa, and the spraying range is fan-shaped.

8. A surface molding in-mold coating process for carbon fiber automotive rearview mirror exterior components as claimed in claim 6, wherein, The paint spraying pressure in step l is controlled at 0.4-0.6Mpa, the gun speed is 200-300mm / s, and the gun distance is 150-250mm.