Spraying process for carbon fiber reinforced composite material part

Abstract

The invention discloses a spraying process for a carbon fiber reinforced composite material workpiece. The spraying process comprises the following steps: S1, polishing and roughening treatment; s2, spraying primer; s3, baking is conducted; s4, polishing and roughening treatment; s5, spraying finish paint; s6, baking is conducted; and S7, grinding and polishing. According to the technology, an existing two-bottom and one-surface spraying technology of a fiber reinforced composite material workpiece is optimized into a one-bottom and one-surface spraying technology, the baking frequency and the baking time are optimized, the technological process is integrally simplified, and the technological process time is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of composite materials, in particular to a spraying process of a carbon fiber reinforced composite material part. BACKGROUND

[0002] At present, with the implementation of the national carbon emission policy and the intensification of the global energy crisis, the development of the automobile industry begins to develop towards light weight in order to achieve energy saving and emission reduction. Compared with traditional metal materials, carbon fiber composite materials are usually lighter in weight and higher in strength, and the designability of fiber composite materials is very strong. According to the stress condition of the product structure, the products of anisotropy and different thickness can be made by adjusting the structure and arrangement of the fibers, so as to improve the overall rigidity of the parts and achieve the best lightweight design scheme; the impact resistance of the composite material is also good, which can absorb a certain amount of impact energy. Therefore, carbon fiber composite materials begin to be widely used in automobile interior and exterior parts and structural parts.

[0003] At present, as the automobile interior and exterior parts of carbon fiber composite materials, the hot pressing tank process + polishing + three times spraying and baking process is usually used for production and manufacturing, the overall production cycle time is too long, and there are many appearance defects, and the production qualified rate is generally low; a large amount of manpower and auxiliary materials are needed to assist in completing the product production and manufacturing work to meet the delivery demand.

[0004] In order to solve the above technical problems, the spraying process of carbon fiber composite material parts is optimized in flexibility and diversity, which reduces the on-site production time, labor intensity and production auxiliary materials under the premise of meeting the quality and appearance of products. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a spraying process for carbon fiber composite material parts, which improves the production efficiency of carbon fiber composite material parts, improves the product qualified rate, and simultaneously reduces the on-site production time, labor intensity and production auxiliary materials, thereby saving the manufacturing cost of carbon fiber composite material parts.

[0006] To achieve the above purpose, the present application realizes the following technical scheme: A spraying process for a carbon fiber reinforced composite material part, comprising: S1, polishing and roughening treatment; S2, spraying primer; S3, baking; S4, polishing and roughening treatment; S5, spraying topcoat layer; S6, baking; S7, polishing and polishing.

[0007] In the above embodiment, the spraying process of the carbon fiber reinforced composite part is optimized to one bottom and two sides, two baking, which reduces the number of baking and shortens the single baking time, simplifies the process flow and shortens the process flow time.

[0008] In another embodiment, the grinding and roughening process in step S1 includes first grinding the surface of the product blank with 140# sandpaper, then grinding again with 200# sandpaper, and cleaning the product surface.

[0009] In the above embodiment, through grinding, on the one hand, the foreign matter on the product surface is ground and treated clean, and on the other hand, the product surface roughness is improved, which is beneficial to the filling of the primer to the product defects and the combination of the primer to the product in the next process of spraying primer.

[0010] In another embodiment, the step S2 of spraying the primer layer includes: S21, spraying the first primer, the film thickness is 100±10u, and then standing for 50-70 minutes; S22, spraying the second primer, the film thickness is 100±10u, and then standing for 50-70 minutes.

[0011] In the above embodiment, the primer adopts a process of one bottom and two sides, compared with the two bottom process in the prior art, one baking process is reduced, and the required time of the whole process flow is shortened.

[0012] In another embodiment, the primer includes, by weight: polyurethane acrylic primer, 95-110 parts; curing agent, 30-35 parts; diluent, 25-35 parts.

[0013] The viscosity of the primer is controlled at 12S; In this embodiment, the film forming property of the primer can be ensured and flash drying can be achieved.

[0014] In another embodiment, the step S3 of baking is at a temperature of 70±5℃ for a time of 120±10 minutes.

[0015] In another embodiment, the step S4 of grinding and roughening includes: first grinding with 400# sandpaper, then grinding again with 500# sandpaper, and cleaning the product surface.

[0016] In another embodiment, the step S5 of spraying the topcoat includes, by weight of raw materials: polyurethane acrylic topcoat, 95-110 parts; curing agent, 30-35 parts; Diluent, 5-15 parts; In another embodiment, the step S5 spraying the topcoat comprises: S51, spraying the first topcoat, film thickness 30±10u, then standing for 50 minutes or more; S52, spraying the second topcoat, film thickness 30±10u, then standing for 50 minutes or more.

[0017] In another embodiment, the step S6 baking, the temperature is 70±5℃, and the time is 120±10 minutes.

[0018] In another embodiment, the step S7 polishing, using 2000# sandpaper to polish, and then polishing again.

[0019] Beneficial effects: compared with the existing process of two bottoms and one surface, the one bottom and one surface process of the present application reduces the number of baking and shortens the single baking time, improves the overall production cycle efficiency by 30%; and saves paint, sandpaper, wiping cloth and other auxiliary materials; at the same time, the incidence of quality problems such as bubbles, collapse and pinholes is reduced, and the quality is improved by 90%. BRIEF DESCRIPTION OF DRAWINGS

[0020] ATTACHMENT Figure 1 is a process flowchart of the prior art; ATTACHMENT Figure 2 is a process flowchart of the present application. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described below with reference to the accompanying drawings and preferred embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure herein. The present application can also be implemented or applied by different specific embodiments, and various modifications or changes can be made to the details in this specification based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, and are not intended to limit the protection scope of the present application.

[0022] Referring to the accompanying Figure 2 , a spraying process for a fiber-reinforced composite product, comprising the steps of: S1, roughening and cleaning the surface of the product; specifically including: first using 140# sandpaper to polish the surface of the product roughing, and then using 200# sandpaper to polish twice and clean the surface dust; S2, spraying the primer; specifically including: S21, spraying the first primer, film thickness 100±10u, then standing for at least 50 minutes; S22, spraying the second primer, film thickness 100±10u, then standing for at least 50 minutes; The primer comprises, by weight parts of raw materials: polyurethane acrylic primer, 95-110 parts; curing agent, 30-35 parts; diluent, 25-35 parts; S3, baking; the specific temperature is controlled at 70±5℃, and the time is 120±10 minutes; S4, polishing and roughening treatment; specifically, first polishing treatment is performed using 400# sandpaper, then second polishing is performed using 500# sandpaper, and the surface dust is cleaned; S5, spraying topcoat; specifically, it comprises: S51, spraying the first topcoat, the film thickness is 30±10u, and then at least standing for 50 minutes; S52, spraying the second topcoat, the film thickness is 30±10u, and then at least standing for 50 minutes; The topcoat comprises, by weight parts of raw materials: polyurethane acrylic topcoat, 95-110 parts; curing agent, 30-35 parts; diluent, 5-15 parts; S6, baking; specifically, the temperature is controlled at 70±5℃, and the time is controlled at 120±10 minutes; S7, polishing and polishing; specifically, first polishing is performed using 2000# sandpaper, and then polishing is performed. Embodiment

[0023] This embodiment takes spraying automobile fender as an example.

[0024] A spraying process for carbon fiber composite parts, comprising the steps of: S1, polishing and roughening the automobile fender and cleaning the surface, specifically comprising: first polishing the surface of the product roughcast using 140# sandpaper, then second polishing using 200# sandpaper, and then cleaning the product surface dust, imprint, and performing electrostatic cleaning; S2, spraying the primer layer, specifically comprising: S21, spraying the first primer, the film thickness is 100±10u, and then standing for 50-70 minutes; S22, spraying the second primer, the film thickness is 100±10u, and then standing for 50-70 minutes; The primer comprises, by weight parts of raw materials: polyurethane acrylic primer, specifically model 7500, 100 parts; curing agent, 33 parts; diluent, 15 parts; The viscosity of the primer is controlled at 12s; S3, baking, specifically, the temperature is controlled at 70±5℃, the time is controlled at 120±10 minutes, and the fender is dried; S4, polishing and roughening treatment; specifically, first polishing treatment is performed by using 400# sandpaper, second polishing treatment is performed by using 500# sandpaper, and then static electricity is removed after cleaning product surface dust and marks; S5, spraying topcoat; specifically, it comprises: S51, spraying the first topcoat, the film thickness is 30±10u, and then at least standing for 50 minutes; S52, spraying the second topcoat, the film thickness is 30±10u, and then at least standing for 50 minutes; The topcoat comprises, by weight: polyurethane acrylic topcoat, specifically, the model is C119, 100 parts; curing agent, 35 parts; diluent, 10 parts; The viscosity of the topcoat is controlled at 12s; S6, baking; specifically, the temperature is controlled at 70±5℃, and the time is controlled at 120±10 minutes; S7, polishing and polishing; specifically, first polishing is performed by using 2000# sandpaper, and then polishing is performed.

[0025] The fender in the embodiment is subjected to performance test, the test standard is 16949 quality system whole vehicle standard, 2 samples are selected for each test item, and the test results are shown in Table 1. Table 1 Embodiment

[0026] The embodiment takes spraying automobile fender as an example.

[0027] A spraying process of a carbon fiber composite part, comprising the steps of: S1, polishing and roughening the automobile fender; specifically, first polishing is performed on the surface of the product roughcast by using 140# sandpaper, then second polishing is performed by using 200# sandpaper, and then static electricity is removed after cleaning product surface dust and marks; S2, spraying a primer layer; specifically, it comprises: S21, spraying the first primer, the film thickness is 100±10u, and then standing for 50-70 minutes; S22, spraying the second primer, the film thickness is 100±10u, and then standing for 50-70 minutes; The primer comprises, by weight: polyurethane acrylic primer, specifically, the model is D821, 100 parts; curing agent, 30 parts; Diluent, 25 parts; The viscosity of the primer is controlled at 12s; S3. Baking: Specifically, the temperature is controlled at 70±5℃ and the time is controlled at 120±10 minutes to dry the fenders. S4. Grinding and roughening treatment; specifically including: first grinding with 400# sandpaper, then grinding a second time with 500# sandpaper, cleaning dust and marks from the product surface, and then performing electrostatic removal. S5. Applying topcoat; specifically includes: S51. Spray the first coat of topcoat, with a film thickness of 30±10u, and then let it stand for at least 50 minutes. S52, apply the second coat of paint, with a film thickness of 30±10u, and then let it stand for at least 50 minutes; The topcoat, by weight of raw materials, comprises: Polyurethane acrylic topcoat, specific model D894, 100 parts; Hardener, 35 parts; Diluent, 10 parts; The viscosity of the topcoat is controlled at 12s; S6. Baking; specifically, the temperature should be controlled at 70℃ and the time at 120±10 minutes. S7. Grinding and polishing, specifically including: first grinding with 2000# sandpaper, and then polishing.

[0028] The performance of the fender in this embodiment was tested according to the 16949 quality system vehicle standard. Two samples were selected for each test item. The test results are detailed in Table 2. Table 2 Comparative Example 1 As a comparative example of Example 1, this comparative example adopts the existing two-coat, one-surface spraying process. For the specific process flow, please refer to the appendix. Figure 1 The steps include: Step 1: Roughen and clean the surface of the product; Step 2: Spray the primer and let it sit for 60 minutes; Step 3: Bake for 180 minutes; Step 4: Roughen and clean the product surface; Step 5: Spray the primer and let it sit for 60 minutes; Step 6: Bake for 180 minutes; Step 7: Roughen and clean the product surface; Step 8: Spray the topcoat and let it sit for 60 minutes; Step 9: Bake for 180 minutes; Step 10, polishing.

[0029] Example 1 compared with Comparative Example 1: (1) Reduced from two bottom one side to one bottom one side, and reduced the baking times and single baking time, the overall production cycle efficiency improved 30%; (2) Process optimization, saving labor costs, according to the annual production of 270,000 pieces, can solve the labor cost of 1.29 million yuan / year; (3) Process optimization, reducing the use of paint, sandpaper, wiping paper and other auxiliary materials, according to the annual production of 270,000 pieces, it can save auxiliary materials 1.3634 million yuan / year; (4) The apparent quality is improved, the problems of bubbles, collapse, pinholes, etc. According to the annual production of 270,000 pieces, it is reduced from 6233.5 cases / year to 636 cases / year, and the quality is improved by 90%.

Claims

1. A spraying process for carbon fiber reinforced composite material parts, characterized in that, Including the following steps: S1. Grinding and roughening treatment; S2, Apply primer; S3, Baking; S4. Grinding and roughening treatment; S5. Spraying topcoat; S6. Baking; S7. Grinding and polishing.

2. The spraying process for a carbon fiber reinforced composite material part according to claim 1, characterized in that, The roughening process in step S1 includes: first, using 140# sandpaper to roughen the surface of the product blank, and then using 200# sandpaper for secondary roughening, and cleaning the product surface.

3. The spraying process for a carbon fiber reinforced composite material part according to claim 1, characterized in that, The step S2, spraying the primer, includes: S21. Spray the first coat of primer, with a film thickness of 100±10u, and then let it stand for more than 50 minutes. S22. Spray the second coat of primer, with a film thickness of 100±10u, and then let it stand for more than 50 minutes.

4. The spraying process for a carbon fiber reinforced composite material part according to claim 1, characterized in that, The primer, by weight of raw materials, comprises: Polyurethane acrylic primer, 95-110 parts; Hardener, 30-35 parts; Diluent, 25-35 parts.

5. The spraying process for a carbon fiber reinforced composite material part according to claim 1, characterized in that, The baking process in step S3 is carried out at a temperature of 70±5℃ for 120±10 minutes.

6. The spraying process for a carbon fiber reinforced composite material part according to claim 1, characterized in that, The step S4 roughening process includes: first, using 400# sandpaper for roughening, then using 500# sandpaper for secondary roughening, and cleaning the product surface.

7. The spraying process for a carbon fiber reinforced composite material part according to claim 1, characterized in that, The topcoat, by weight of raw materials, comprises: Polyurethane acrylic topcoat, 95-110 parts; Hardener, 30-35 parts; Diluent, 5-15 parts.

8. The spraying process for a carbon fiber reinforced composite material part according to claim 1, characterized in that, Step S5, spraying the topcoat, includes: S51. Apply the first coat of topcoat to the sneeze. The film thickness should be 30±10u. Then let it stand for more than 50 minutes. S52. Spray the second coat of topcoat, with a film thickness of 30±10u, and then let it stand for more than 50 minutes.

9. The spraying process for a carbon fiber reinforced composite material part according to claim 1, characterized in that, The baking process in step S6 is carried out at a temperature of 70±5℃ for 120±10 minutes.

10. The spraying process for a carbon fiber reinforced composite material part according to claim 1, characterized in that, Step S7, grinding and polishing, includes grinding with 2000# sandpaper followed by polishing.

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