Repair process for color difference formed by polishing and brightening transparent carbon fibers in coating process

Abstract

The invention discloses a process for repairing chromatic aberration caused by polishing and brightening of transparent carbon fibers in a coating process, which comprises the following steps of: mixing RAL9005 black epoxy resin powder and EP128 epoxy transparent resin according to a certain proportion to prepare repairing resin; and by finely adjusting the proportion of the RAL9005 black epoxy resin powder, the paint can be suitable for all carbon fiber automobile part products of clear paint, and aiming at actual production, the product quality can be improved, the times of polishing, soil supplementing and paint spraying can be reduced, the processing efficiency of production is improved, the cost is reduced to a great extent, the efficiency is improved, and the operation mode is simplified.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber automotive component surface coating repair technology, and in particular to a repair process for color differences caused by polishing and brightening during the coating process of transparent carbon fiber. Background Technology

[0002] With the booming development of pure electric vehicles, lightweighting is receiving increasing attention and favor in the industry due to limitations in battery structure and performance. Carbon fiber composite materials, with their lightweight and high-strength properties, are finding wider application in electric vehicles. As an integral part of the vehicle's main structure, carbon fiber automotive components have stringent requirements for surface coating.

[0003] Currently, most carbon fiber products are formed in autoclaves, resulting in poor surface quality after molding. Common defects include pinholes and insufficient resin on the surface. Therefore, putty polishing is necessary to remove common pinhole problems. However, excessive polishing during this process can damage the resin layer in certain areas, removing the mesh resin layer from the carbon cloth surface and exposing the woven carbon cloth underneath. This polishing process produces a shiny finish and color variations. Figure 1 As shown; moreover, directly spraying clear varnish on this exposed base layer cannot achieve the desired masking and glossy effect, as... Figure 2 As shown.

[0004] Due to poor surface quality control, color differences occurred, and repeated spraying resulted in high production costs, failing to meet the product surface quality requirements and the company's cost reduction and efficiency improvement objectives. Summary of the Invention

[0005] The purpose of this invention is to provide a repair process for color differences caused by polishing during the coating process of transparent carbon fiber, in order to solve the problem that color differences occur after polishing during the existing carbon fiber automotive parts coating process, and cannot be restored by touch-up paint, but can only be restored by removing the paint and repainting, which will greatly increase the production cost.

[0006] To address the aforementioned technical problems, this invention provides a repair process for color differences caused by polishing and brightening during the coating process of transparent carbon fiber, comprising the following steps: Step A: Resin preparation: Mix RAL9005 black epoxy resin powder and EP128 transparent epoxy resin in a specific ratio; for example... Figure 3 As shown; Step A1: Mix and stir thoroughly for 2 minutes to allow the RAL9005 black epoxy resin powder to be humidified and incorporated into the EP128 transparent epoxy resin; Figure 4 As shown; Step B: Applying the repair resin. Before repairing, wipe the area with a cloth and alcohol to clean it. Then, apply the well-stirred repair resin to the area with shiny color difference caused by sanding, and make sure to completely cover the area with shiny color difference. Step C: Scraping. Use a rubber scraper to smooth and even out the areas where the resin is needed to repair color differences. Step D: Apply adhesive. Apply thin patches multiple times during the scraping process. Through multiple scraping and patching, the color will become closer and closer to the product surface color each time. Step E: Baking. After repair, the product is left to stand for 20 minutes, and then baked. The baking temperature is set to 80℃ and the baking time is 60 minutes to cure the surface of the repaired area. Step F: Grinding. After curing, use 600-grit sandpaper and 800-grit sponge sandpaper to grind the surface of the repaired area of ​​the product until it is smooth. Step G: Touch-up painting. Use a glossy clear coat to spray paint the repaired area to minimize color difference. After the paint has cured, the effect is glossy with no obvious color difference, as shown below. Figure 5 As shown.

[0007] Preferably, in step A, the mixing ratio is EP128 epoxy transparent resin: RAL9005 black epoxy resin powder = 100: 0.5-2, and the ratio can be adjusted for different gloss levels.

[0008] Preferably, in step A, the preparation of the repair resin involves heating the RAL9005 black resin with a UV curing lamp to melt and humidify it before mixing it with the EP128 epoxy putty agent. The effect after melting is slightly better than that of pure powder.

[0009] Preferably, the gloss of RAL9005 black epoxy resin powder is required to be between 35% and 45%. Too high a gloss will result in obvious black spots and a noticeable color difference compared to the product surface; too low a gloss will make the product surface appear dull.

[0010] Compared with the prior art, the beneficial effects of the present invention are: This invention, by finely adjusting the proportion of RAL9005 black epoxy resin powder, can be applied to all transparent carbon fiber automotive parts products. In actual production, it can increase product quality, reduce the number of sanding, puttying, and painting operations, improve production efficiency, significantly reduce costs and increase efficiency, and simplify operation. Attached Figure Description

[0011] Figure 1 This is a diagram illustrating the defect of carbon fiber products where excessive sanding after painting causes the carbon cloth to become shiny and have a color difference. Figure 2This is a diagram showing a polished, shiny surface with color differences that still exhibits noticeable shine after being painted. Figure 3 This is a state diagram of RAL9005 black epoxy resin powder provided by the present invention added to EP128 transparent epoxy resin in a certain proportion. Figure 4 This is a diagram showing the state of uniform mixing of RAL9005 black epoxy resin powder and EP128 transparent epoxy resin provided by the present invention. Figure 5 These are images showing the effect of repairing paint spraying using the repair agent formulated according to this invention; Figure 6 This is an adhesion test diagram taken after the paint was repaired using the repair agent formulated according to the present invention. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0013] In addition, the features, operations, and characteristics described in the 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 that is readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the purpose of clearly describing a particular embodiment and are not necessarily required orders, unless otherwise stated that a particular order must be followed. Example

[0014] This invention provides a repair process for color differences caused by polishing during the coating process of transparent carbon fiber, comprising the following steps: Step A: Resin preparation: Mix RAL9005 black epoxy resin powder and EP128 transparent epoxy resin in a specific ratio; for example... Figure 3 As shown; Step A1: Mix and stir thoroughly for 2 minutes to allow the RAL9005 black epoxy resin powder to be humidified and incorporated into the EP128 transparent epoxy resin; Figure 4 As shown; Step B: Applying the repair resin. Before repairing, wipe the area with a cloth and alcohol to clean it. Then, apply the well-stirred repair resin to the area with shiny color difference caused by sanding, and make sure to completely cover the area with shiny color difference. Step C: Scraping. Use a rubber scraper to smooth and even out the areas where the resin is needed to repair color differences. Step D: Apply adhesive. Apply thin patches multiple times during the scraping process. Through multiple scraping and patching, the color will become closer and closer to the product surface color each time. Step E: Baking. After repair, the product is left to stand for 20 minutes, and then baked. The baking temperature is set to 80℃ and the baking time is 60 minutes to cure the surface of the repaired area. Step F: Grinding. After curing, use 600-grit sandpaper and 800-grit sponge sandpaper to grind the surface of the repaired area of ​​the product until it is smooth. Step G: Touch-up painting. Use a glossy clear coat to spray paint the repaired area to minimize color difference. After the paint has cured, the effect is glossy with no obvious color difference, as shown below. Figure 5 As shown.

[0015] Specifically, in step A, the mixing ratio is EP128 epoxy transparent resin: RAL9005 black epoxy resin powder = 100: 0.5-2, and the ratio can be adjusted for different gloss levels.

[0016] In this embodiment, the epoxy resin used has a strong gripping force on the product surface, so it has good adhesion to the product surface.

[0017] Furthermore, in step A, the preparation of the repair resin involves heating the RAL9005 black resin with a UV curing lamp to melt and humidify it before mixing it with the EP128 epoxy putty. The effect after melting is slightly better than that of pure powder.

[0018] Furthermore, the gloss requirement for RAL9005 black epoxy resin powder is between 35% and 45%. Too high a gloss will result in obvious black spots and a noticeable color difference compared to the product surface; too low a gloss will make the product surface appear dull.

[0019] like Figure 6 As shown, the adhesion test conducted after repairing the paint sprayed with the repair agent formulated according to the present invention showed a cross-cutting grade of 0, which meets the technical requirements.

[0020] This invention, by finely adjusting the proportion of RAL9005 black epoxy resin powder, can be applied to all transparent carbon fiber automotive parts products. In actual production, it can increase product quality, reduce the number of sanding, puttying, and painting operations, improve production efficiency, significantly reduce costs and increase efficiency, and simplify operation.

[0021] 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 repair process for color differences caused by polishing and brightening during the coating process of transparent carbon fiber, characterized in that, Includes the following steps: Step A: Preparation of repair resin. Mix RAL9005 black epoxy resin powder and EP128 transparent epoxy resin in a certain proportion. Step A1: Mix and stir thoroughly for 2 minutes to allow the RAL9005 black epoxy resin powder to be humidified and incorporated into the EP128 epoxy transparent resin. Step B: Apply the well-stirred repair resin to the area where the polishing caused a shiny color difference, ensuring complete coverage of the area. Step C: Scraping. Use a rubber scraper to smooth and even out the areas where the resin is needed to repair color differences. Step D: Apply adhesive. Apply thin patches multiple times during the scraping process. Through multiple scraping and patching, the color will become closer and closer to the product surface color each time. Step E: Baking. After repair, the product is left to stand for 20 minutes, and then baked. The baking temperature is set to 80℃ and the baking time is 60 minutes to cure the surface of the repaired area. Step F: Grinding. After curing, use 600-grit sandpaper and 800-grit sponge sandpaper to grind the surface of the repaired area of ​​the product until it is smooth. Step G: Touch up the paint. Use a glossy transparent varnish to spray paint the repaired area to reduce the color difference.

2. The repair process for color difference caused by polishing and brightening during the coating process of transparent carbon fiber as described in claim 1, characterized in that, In step A, the mixing ratio is EP128 epoxy transparent resin : RAL9005 black epoxy resin powder = 100 : 0.5-2.

3. The repair process for color difference caused by polishing and brightening during the coating process of transparent carbon fiber as described in claim 2, characterized in that, In step A, during the preparation of the repair resin, RAL9005 black resin is heated by a UV curing lamp to melt and humidify it before being mixed with EP128 epoxy putty.

4. The repair process for color difference caused by polishing and brightening during the coating process of transparent carbon fiber as described in claim 2, characterized in that, The gloss requirement for RAL9005 black epoxy resin powder is between 35% and 45%.

Images