Light-absorbing matt black coating for automobile instrument frame and preparation method of light-absorbing matt black coating

Abstract

The invention relates to the technical field of coatings, and particularly provides a light-absorbing matt black coating for an automobile instrument frame and a preparation method of the light-absorbing matt black coating. The matt black coating is prepared from the following raw materials in parts by weight: 12 to 16 parts of high-pigment carbon black, 4 to 6 parts of dispersing agent, 50 to 60 parts of film-forming resin, 1.2 to 1.6 parts of flatting agent, 1.2 to 1.6 parts of defoaming agent, 15 to 25 parts of solvent, 4 to 6 parts of matt powder, 1.5 to 2.5 parts of fumed silica, 4 to 6 parts of silane coupling agent, 4 to 6 parts of fluorocarbon modified acrylate and 1.2 to 1.6 parts of ultraviolet light absorber. The obtained coating has the comprehensive performance of good stability, durability, adhesive force, matte effect, weather resistance and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a light-absorbing matte black coating for an automobile instrument frame and a preparation method thereof. Background Art

[0002] The instrument panel frame is the outer frame or frame of the vehicle's dashboard. It is a crucial component of the instrument panel, used to mount and secure various instruments and controls. To reduce glare from the windshield, improve visibility, and enhance driving safety, the instrument panel frame is typically coated with a light-absorbing matte black paint.

[0003] Light-absorbing matte black paint is a low-gloss, high-fog finish. This matte finish is achieved through surface treatment technology, eliminating strong reflections and maintaining a soft visual effect on the instrument panel in all lighting conditions. Light-absorbing matte black paint has a unique texture, creating a more understated and reserved appearance without sacrificing individuality.

[0004] Existing light-absorbing matte black coatings typically consist of a film-forming resin matrix, black pigments (such as carbon black), fillers, additives, and solvents. While pigments like carbon black can provide a certain degree of light absorption, their light absorption effect may not be ideal for applications with extremely high light absorption requirements. Furthermore, existing light-absorbing matte black coatings are prone to problems such as poor color retention and durability. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a light-absorbing matte black coating for an automobile instrument frame and a preparation method thereof.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present application discloses a light-absorbing matte black coating for an automobile instrument frame. The components of the matte black coating include the following raw materials in parts by weight: 12-16 parts of high-pigment carbon black, 4-6 parts of a dispersant, 50-60 parts of a film-forming resin, 1.2-1.6 parts of a leveling agent, 1.2-1.6 parts of a defoaming agent, 15-25 parts of a solvent, 4-6 parts of a matte powder, 1.5-2.5 parts of fumed silica, 4-6 parts of a silane coupling agent, 4-6 parts of a fluorocarbon-modified acrylate, and 1.2-1.6 parts of a UV absorber.

[0007] Preferably, the components of the matte black coating include the following raw materials in parts by weight: 14 parts of high-pigment carbon black, 5 parts of dispersant, 55 parts of film-forming resin, 1.4 parts of leveling agent, 1.4 parts of defoaming agent, 20 parts of solvent, 5 parts of matte powder, 2 parts of fumed silica, 5 parts of silane coupling agent, 5 parts of fluorocarbon modified acrylate and 1.4 parts of ultraviolet absorber.

[0008] Preferably, the solvent is one or more of toluene, xylene, and butanone, the high-pigment carbon black is Cabot M1400 high-pigment carbon black, and the dispersant is Efcona dispersant 4720.

[0009] Through the above technical solution, Cabot M1400 high-pigment carbon black is a powdered specialty carbon black with a high surface area, offering exceptional jetness and excellent dispersibility, high color strength, and good stability in both solvent-based and water-based coatings. Cabot M1400 high-pigment carbon black absorbs and scatters light, improving hiding power and brightness. It also effectively resists UV light and oxidation, maintaining color stability and durability. AFCONA-4720, a triblock polymer dispersant, consists of a polyacrylate and a modified polyacrylate block polymer. Its structure features an AB diblock front end and an anchor group, achieving an optimal balance between broad compatibility and universal pigment compatibility. The film-forming resin provides excellent film-forming properties and adhesion to the black paste made with Cabot M1400 high-pigment carbon black. The adhesion promoter promotes adhesion between the coating and the ABS substrate of the automotive instrument panel. Matting powder can reduce the gloss of a coating, achieving a matte effect while also improving its feel and abrasion resistance. Fumed silica has excellent thickening and anti-settling properties, enhancing the storage stability of the coating and helping to increase the coating's roughness, further enhancing the matte effect. Fluorocarbon-modified acrylates can eliminate orange peel and craters, improving the coating's surface smoothness. UV absorbers can enhance the coating's weather resistance, slowing yellowing and chalking.

[0010] Preferably, the matte black coating comprises the following raw materials in parts by weight: 4 parts of polyaniline nanofibers.

[0011] Preferably, the preparation method of polyaniline nanofibers is as follows: (1) Weigh 2.5 g of aniline into a beaker, dissolve in deionized water, stir evenly, and then cool to 0-5°C in an ice water bath for later use; (2) Take another beaker, add 250 mL of 1 mol / L hydrochloric acid, and slowly add it dropwise to the aniline solution obtained in step (1) under stirring, and adjust the pH value to 1.5; (3) Weigh 0.25 g of oxidant and 4.8 g of o-aminobenzenesulfonic acid, dissolve them in deionized water, and slowly add them dropwise to the aniline solution obtained in step (2) under stirring. Stir continuously for 1 h, let it stand at room temperature for 24 h, separate the precipitate by centrifuge at a speed of 8500-9000 r / min, wash it repeatedly with deionized water until the pH is close to neutral, and then vacuum dry the product for 12 h to obtain polyaniline nanofibers.

[0012] By setting up the above technical scheme, polyaniline nanofibers have strong water solubility, high conductivity and unique reversible redox properties. The addition of polyaniline nanofibers greatly improves the anti-corrosion performance of the coating and enhances the anti-corrosion effect of the automobile instrument frame.

[0013] Preferably, the oxidant is one of vanadium pentoxide, ammonium persulfate or ammonium peroxodisulfate.

[0014] By setting up the above technical solution, vanadium pentoxide, ammonium persulfate and ammonium peroxydisulfate are all oxidants with strong oxidizing properties, which can promote the directional polymerization of aniline into a fiber structure.

[0015] Preferably, in step (3), the vacuum drying temperature is 55°C.

[0016] Preferably, the composition of the fluorocarbon modified acrylate includes the following raw materials in parts by weight: 55-65 parts of acrylate monomer, 12-20 parts of fluorine-containing monomer, 0.8-1.4 parts of initiator, 35-45 parts of solvent and 0.5-2.5 parts of crosslinking agent; The preparation method of fluorocarbon modified acrylate is as follows: 1) Weigh the acrylate monomer and solvent in proportion, mix the acrylate monomer and solvent to 1 / 2 of the total weight, add the initiator, stir evenly, and set aside; 2) Weigh the fluorinated monomer in proportion, add 1 / 2 of the total weight of the solvent, mix well, and set aside; 3) The reactor is heated to 65-70°C, and a crosslinking agent and the solution obtained in step 1) and step 2) are added, mixed evenly, and reacted for 2-3 hours. The reaction product is cooled to room temperature, and the solvent is removed by decompression and distillation to obtain a fluorocarbon-modified acrylate.

[0017] Through the above technical solution, the acrylate monomer provides the basic polymer backbone, while the fluorinated monomer introduces fluorocarbon chains, imparting excellent weather and water resistance to the polymer. The initiator controls the polymerization reaction rate and conversion rate, while the crosslinker increases the degree of crosslinking in the polymer, thereby enhancing the coating's hardness, abrasion resistance, and chemical resistance.

[0018] The present application also discloses a method for preparing a light-absorbing matte black coating for an automobile instrument frame, the method comprising the following steps: S1. Mix 1 / 3 of the total weight of high-pigment carbon black, dispersant, and film-forming resin with 1 / 2 of the total weight of solvent at 45°C and a speed of 2200-2300 r / min for 30 minutes to form a uniform slurry; S2, sand-mill the slurry obtained in S1 using 0.4 mm zirconia beads for 2-4 h; S3, add leveling agent, defoaming agent, solvent, matte powder, fumed silica, silane coupling agent, fluorocarbon modified acrylate, ultraviolet absorber and remaining film-forming resin and solvent to the slurry obtained in S2, and stir at a speed of 500-550 r / min for 1-2 hours; S4. Filter the slurry obtained in S3 through a 280-300 mesh filter to remove dispersed particles and grinding medium fragments to obtain a light-absorbing matte black coating.

[0019] Preferably, the particle fineness of the material obtained in step S2 is 3 μm.

[0020] The beneficial effects of the present invention are: Cabot M1400 high-pigment carbon black is a powdered specialty carbon black with a high surface area, offering exceptional jetness and excellent dispersibility, high color strength, and good stability in solvent-based and water-based coatings. Cabot M1400 high-pigment carbon black absorbs and scatters light, improving the hiding power and brightness of the material. It also effectively resists UV light and oxidation, maintaining color stability and durability. AFCONA-4720 from AFCONA is a triblock polymer dispersant. Its molecular formula contains polyacrylate and modified polyacrylate block polymers, with an AB diblock front end and an anchor group structure. This structure provides an optimal balance between broad compatibility and universal pigment adaptability.

[0021] Film-forming resins provide excellent film-forming properties and adhesion for the black paste made with Cabot M1400 high-pigment carbon black. Adhesion promoters promote adhesion between the coating and the ABS substrate of the vehicle instrument panel. Matting powder reduces the coating's gloss, achieving a matte finish while also improving its feel and abrasion resistance. Fumed silica provides excellent thickening and anti-settling properties, enhancing the coating's storage stability and helping to increase the coating's roughness, further enhancing the matte effect. Fluorocarbon-modified acrylates eliminate orange peel and craters, improving the coating's surface smoothness. UV absorbers enhance the coating's weather resistance, slowing yellowing and chalking.

[0022] Polyaniline nanofibers have strong water solubility, high conductivity and unique reversible redox properties. The addition of polyaniline nanofibers greatly improves the anti-corrosion performance of the coating and enhances the anti-corrosion effect of the automobile instrument frame. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] Example 1: This example discloses a light-absorbing matte black coating for an automobile instrument frame. The components of the matte black coating include the following raw materials in parts by weight: 12 parts of Cabot M1400 high-pigment carbon black, 4 parts of Efcona dispersant 4720, 50 parts of film-forming resin, 1.2 parts of leveling agent, 1.2 parts of defoaming agent, 15 parts of toluene, 4 parts of matte powder, 1.5 parts of fumed silica, 4 parts of silane coupling agent, 4 parts of fluorocarbon-modified acrylate, 1.2 parts of ultraviolet absorber and 4 parts of polyaniline nanofiber.

[0025] The preparation method of polyaniline nanofibers is as follows: (1) Weigh 2.5 g of aniline into a beaker, dissolve it in deionized water, stir well, and then cool it to 0°C in an ice water bath for later use; (2) Take another beaker, add 250 mL of 1 mol / L hydrochloric acid, and slowly add it dropwise to the aniline solution obtained in step (1) under stirring, and adjust the pH value to 1.5; (3) Weigh 0.25 g of vanadium pentoxide and 4.8 g of o-aminobenzenesulfonic acid, dissolve them in deionized water, and slowly add them dropwise to the aniline solution obtained in step (2) under stirring. Stir continuously for 1 h, let it stand at room temperature for 24 h, separate the precipitate by centrifuge at a speed of 8500 r / min, wash it repeatedly with deionized water until the pH is close to neutral, and then dry the product under vacuum conditions at 55°C for 12 h to obtain polyaniline nanofibers.

[0026] The components of the fluorocarbon modified acrylate include the following raw materials in parts by weight: 55 parts of acrylate monomer, 12 parts of fluorine-containing monomer, 0.8 parts of initiator, 35 parts of solvent and 0.5 parts of cross-linking agent.

[0027] The preparation method of fluorocarbon modified acrylate is as follows: 1) Weigh the acrylate monomer and solvent in proportion, mix the acrylate monomer and solvent to 1 / 2 of the total weight, add the initiator, stir evenly, and set aside; 2) Weigh the fluorinated monomer in proportion, add 1 / 2 of the total weight of the solvent, mix well, and set aside; 3) The reactor was heated to 65° C., and a crosslinking agent and the solution obtained in step 1) and step 2) were added, mixed evenly, and reacted for 2 h. The reaction product was cooled to room temperature, and the solvent was removed by decompression and distillation to obtain a fluorocarbon-modified acrylate.

[0028] This embodiment also discloses a method for preparing a light-absorbing matte black coating for an automobile instrument frame, comprising the following steps: S1. Mix 1 / 3 of the total weight of high-pigment carbon black, dispersant, and film-forming resin with 1 / 2 of the total weight of toluene at 45°C and 2200 r / min for 30 min to form a uniform slurry; S2, sand-mill the slurry obtained in S1 using 0.4 mm zirconia beads for 2 h until the particle size is 3 µm; S3. Add leveling agent, defoaming agent, toluene, matte powder, fumed silica, silane coupling agent, fluorocarbon modified acrylate, UV absorber, remaining film-forming resin and toluene to the slurry obtained in S2, and stir at a speed of 500 r / min for 1 h; S4. Filter the slurry obtained in S3 through a 280-mesh filter to remove dispersed particles and grinding medium fragments, thereby obtaining a light-absorbing matte black coating.

[0029] Example 2: This example discloses a light-absorbing matte black coating for an automobile instrument frame. The components of the matte black coating include the following raw materials in parts by weight: 16 parts of Cabot M1400 high-pigment carbon black, 6 parts of Efcona dispersant 4720, 60 parts of film-forming resin, 1.6 parts of leveling agent, 1.6 parts of defoaming agent, 25 parts of xylene, 6 parts of matte powder, 2.5 parts of fumed silica, 6 parts of silane coupling agent, 6 parts of fluorocarbon-modified acrylate, 1.6 parts of ultraviolet absorber and 4 parts of polyaniline nanofiber.

[0030] The preparation method of polyaniline nanofibers is as follows: (1) Weigh 2.5 g of aniline into a beaker, dissolve in deionized water, stir evenly, and then cool to 0-5°C in an ice water bath for later use; (2) Take another beaker, add 250 mL of 1 mol / L hydrochloric acid, and slowly add it dropwise to the aniline solution obtained in step (1) under stirring, and adjust the pH value to 1.5; (3) Weigh 0.25 g of ammonium persulfate and 4.8 g of o-aminobenzenesulfonic acid, dissolve them in deionized water, and slowly add them dropwise to the aniline solution obtained in step (2) under stirring. Stir continuously for 1 h, let it stand at room temperature for 24 h, separate the precipitate by centrifuge at a speed of 9000 r / min, wash it repeatedly with deionized water until the pH is close to neutral, and then dry the product under vacuum conditions at 55°C for 12 h to obtain polyaniline nanofibers.

[0031] The components of the fluorocarbon modified acrylate include the following raw materials in parts by weight: 65 parts of acrylate monomer, 20 parts of fluorine-containing monomer, 1.4 parts of initiator, 45 parts of solvent and 2.5 parts of cross-linking agent.

[0032] The preparation method of fluorocarbon modified acrylate is as follows: 1) Weigh the acrylate monomer and solvent in proportion, mix the acrylate monomer and solvent to 1 / 2 of the total weight, add the initiator, stir evenly, and set aside; 2) Weigh the fluorinated monomer in proportion, add 1 / 2 of the total weight of the solvent, mix well, and set aside; 3) The reactor was heated to 70° C., and a crosslinking agent and the solution obtained in step 1) and step 2) were added, mixed evenly, and reacted for 3 h. The reaction product was cooled to room temperature, and the solvent was removed by decompression and distillation to obtain a fluorocarbon-modified acrylate.

[0033] This embodiment also discloses a method for preparing a light-absorbing matte black coating for an automobile instrument frame, comprising the following steps: S1. Mix 1 / 3 of the total weight of high-pigment carbon black, dispersant, and film-forming resin with 1 / 2 of the total weight of xylene at 45°C and 2300 r / min for 30 min to form a uniform slurry; S2, sand-milling the slurry obtained in S1 with 0.4 mm zirconia beads for 4 h until the particle size is 3 µm; S3. Add leveling agent, defoaming agent, xylene, matte powder, fumed silica, silane coupling agent, fluorocarbon modified acrylate, UV absorber, remaining film-forming resin and xylene to the slurry obtained in S2, and stir at a speed of 550 r / min for 2 h; S4. Filter the slurry obtained in S3 through a 300-mesh filter to remove dispersed particles and grinding medium fragments, thereby obtaining a light-absorbing matte black coating.

[0034] Example 3: This example discloses a light-absorbing matte black coating for an automobile instrument frame. The components of the matte black coating include the following raw materials in parts by weight: 14 parts of high-pigment carbon black, 5 parts of a dispersant, 55 parts of a film-forming resin, 1.4 parts of a leveling agent, 1.4 parts of a defoaming agent, 20 parts of butanone, 5 parts of a matte powder, 2 parts of fumed silica, 5 parts of a silane coupling agent, 5 parts of a fluorocarbon-modified acrylate, 1.4 parts of an ultraviolet absorber, and 4 parts of polyaniline nanofibers.

[0035] The preparation method of polyaniline nanofibers is as follows: (1) Weigh 2.5 g of aniline into a beaker, dissolve in deionized water, stir evenly, and then cool to 2°C in an ice water bath for later use; (2) Take another beaker, add 250 mL of 1 mol / L hydrochloric acid, and slowly add it dropwise to the aniline solution obtained in step (1) under stirring, and adjust the pH value to 1.5; (3) Weigh 0.25 g of ammonium peroxydisulfate and 4.8 g of o-aminobenzenesulfonic acid, dissolve them in deionized water, and slowly add them dropwise to the aniline solution obtained in step (2) under stirring. Stir continuously for 1 h, let it stand at room temperature for 24 h, separate the precipitate by centrifuge at a speed of 8700 r / min, wash it repeatedly with deionized water until the pH is close to neutral, and then dry the product under vacuum at 55°C for 12 h to obtain polyaniline nanofibers.

[0036] The components of the fluorocarbon modified acrylate include the following raw materials in parts by weight: 60 parts of acrylate monomer, 16 parts of fluorine-containing monomer, 1.1 parts of initiator, 40 parts of solvent and 1.5 parts of cross-linking agent.

[0037] The preparation method of fluorocarbon modified acrylate is as follows: 1) Weigh the acrylate monomer and solvent in proportion, mix the acrylate monomer and solvent to 1 / 2 of the total weight, add the initiator, stir evenly, and set aside; 2) Weigh the fluorinated monomer in proportion, add 1 / 2 of the total weight of the solvent, mix well, and set aside; 3) The reactor was heated to 67° C., and a crosslinking agent and the solution obtained in steps 1) and 2) were added, mixed evenly, and reacted for 2.5 hours. The reaction product was cooled to room temperature, and the solvent was removed by decompression and distillation to obtain a fluorocarbon-modified acrylate.

[0038] This embodiment also discloses a method for preparing a light-absorbing matte black coating for an automobile instrument frame, comprising the following steps: S1. Mix 1 / 3 of the total weight of high-pigment carbon black, dispersant, and film-forming resin with 1 / 2 of the total weight of solvent at 45°C and 2250 r / min for 30 min to form a uniform slurry; S2, sand-milling the slurry obtained in S1 with 0.4 mm zirconia beads for 3 h until the particle size is 3 µm; S3. Add leveling agent, defoaming agent, butanone, matte powder, fumed silica, silane coupling agent, fluorocarbon modified acrylate, UV absorber and remaining film-forming resin and butanone to the slurry obtained in S2, and stir at a speed of 520 r / min for 1.5 h; S4. Filter the slurry obtained in S3 through a 290-mesh filter to remove dispersed particles and grinding medium fragments, thereby obtaining a light-absorbing matte black coating.

[0039] Comparative Example 1: A light-absorbing matte black coating for an automobile instrument frame. The only difference between the matte black coating and Example 3 is that ordinary carbon black is used instead of Cabot M1400 high-pigment carbon black.

[0040] Comparative Example 2: A light-absorbing matte black paint for an automobile instrument frame. The only difference between the matte black paint and Example 3 is that a common dispersant is used instead of Efcona dispersant 4720.

[0041] Comparative Example 3: A light-absorbing matte black paint for an automobile instrument frame. The only difference between the matte black paint and Example 3 is that no fumed silica is added.

[0042] Comparative Example 4: A light-absorbing matte black paint for an automobile instrument frame. The only difference between the matte black paint and Example 3 is that no silane coupling agent is added.

[0043] Comparative Example 5: A light-absorbing matte black coating for an automobile instrument frame. The matte black coating differs from Example 3 only in that no fluorocarbon-modified acrylate is added.

[0044] Comparative Example 6: A light-absorbing matte black coating for an automobile instrument frame. The only difference between the matte black coating and Example 3 is that ordinary acrylate is used instead of fluorocarbon-modified acrylate.

[0045] Comparative Example 7: A light-absorbing matte black paint for an automobile instrument frame. The only difference between the matte black paint and Example 3 is that no polyaniline nanofibers are added.

[0046] The matte black coatings obtained in Examples 1-3 and Comparative Examples 1-7 were applied to an automobile instrument panel frame for performance testing. The comprehensive performance of the matte black coatings was measured. The results are shown in Table 1.

[0047] Among them, the glossiness (60-degree angle gloss meter) and colorimeter Lab value tests of automotive instrument frame coatings refer to the ISO-2813 standard.

[0048] When conducting acid resistance tests on automotive instrument panel coatings, the main standards used include ISO 2812-3 and GB / T927.

[0049] Table 1 Performance parameters of matte black coatings obtained in Examples 1-3 and Comparative Examples 1-7

[0050] From Table 1 we can see that: Substituting standard carbon black for Cabot M1400 high-pigment carbon black, or substituting standard dispersants for Efcona dispersant 4720, significantly impacted the coating's gloss and colorimeter Lab values. The absence of polyaniline nanofibers significantly impacted the corrosion resistance of the resulting coating, likely due to the significant improvement in the coating's corrosion resistance, enhancing the corrosion protection of the vehicle's instrument panel.

[0051] No fumed silica or fluorocarbon-modified acrylate is added, which has a slight effect on the gloss of the coating formed by the coating.

[0052] Failure to add fluorocarbon-modified acrylate or use of ordinary acrylate to replace fluorocarbon-modified acrylate has a slight impact on the corrosion resistance of the coating formed by the coating.

[0053] In summary, Cabot M1400 high-pigment carbon black is a powdered specialty carbon black with a high surface area, offering exceptional jetness and excellent dispersibility, high color strength, and good stability in both solvent-based and water-based coatings. Cabot M1400 high-pigment carbon black absorbs and scatters light, improving the material's hiding power and brightness. It also effectively resists UV light and oxidation, maintaining the material's color stability and durability. AFCONA-4720 from Efcona is a triblock polymer dispersant. Its molecular formula contains polyacrylate and modified polyacrylate block polymers, with an AB diblock front-end and anchor group structure. This structure provides an optimal balance between broad compatibility and universal pigment adaptability.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A light-absorbing matte black paint for automobile instrument frames, characterized in that: The matte black coating comprises the following raw materials in parts by weight: 12-16 parts of high-pigment carbon black, 4-6 parts of dispersant, 50-60 parts of film-forming resin, 1.2-1.6 parts of leveling agent, 1.2-1.6 parts of defoaming agent, 15-25 parts of solvent, 4-6 parts of matte powder, 1.5-2.5 parts of fumed silica, 4-6 parts of silane coupling agent, 4-6 parts of fluorocarbon modified acrylate and 1.2-1.6 parts of ultraviolet absorber.

2. The light-absorbing matte black paint for automobile instrument frame according to claim 1, characterized in that: In parts by weight, the components of the matte black paint include the following raw materials: 14 parts of high-pigment carbon black, 5 parts of dispersant, 55 parts of film-forming resin, 1.4 parts of leveling agent, 1.4 parts of defoaming agent, 20 parts of solvent, 5 parts of matte powder, 2 parts of fumed silica, 5 parts of silane coupling agent, 5 parts of fluorocarbon modified acrylate and 1.4 parts of ultraviolet absorber.

3. The light-absorbing matte black paint for automobile instrument frame according to claim 1 or 2, characterized in that: The solvent is one or more of toluene, xylene, and butanone; the high-pigment carbon black is Cabot M1400 high-pigment carbon black; and the dispersant is Efcona dispersant 4720.

4. The light-absorbing matte black paint for automobile instrument frame according to claim 1 or 2, characterized in that: In parts by weight, the composition of the matte black coating includes the following raw materials in parts by weight: 4 parts of polyaniline nanofibers.

5. The light-absorbing matte black paint for automobile instrument frame according to claim 4, characterized in that: The preparation method of polyaniline nanofibers is as follows: (1) Weigh 2.5 g of aniline into a beaker, dissolve in deionized water, stir evenly, and then cool to 0-5°C in an ice water bath for later use; (2) Take another beaker, add 250 mL of 1 mol / L hydrochloric acid, and slowly add it dropwise to the aniline solution obtained in step (1) under stirring, and adjust the pH value to 1.5; (3) Weigh 0.25 g of oxidant and 4.8 g of o-aminobenzenesulfonic acid, dissolve them in deionized water, and slowly add them dropwise to the aniline solution obtained in step (2) under stirring. Stir continuously for 1 h, let it stand at room temperature for 24 h, separate the precipitate by centrifuge at a speed of 8500-9000 r / min, wash it repeatedly with deionized water until the pH is close to neutral, and then vacuum dry the product for 12 h to obtain polyaniline nanofibers.

6. The light-absorbing matte black paint for automobile instrument frame according to claim 5, characterized in that: The oxidant is one of vanadium pentoxide, ammonium persulfate or ammonium peroxydisulfate.

7. The light-absorbing matte black paint for automobile instrument frame according to claim 6, characterized in that: In step (3), the vacuum drying temperature is 55°C.

8. The light-absorbing matte black paint for automobile instrument frame according to claim 2, characterized in that: The composition of the fluorocarbon modified acrylate includes the following raw materials in parts by weight: 55-65 parts of acrylate monomer, 12-20 parts of fluorine-containing monomer, 0.8-1.4 parts of initiator, 35-45 parts of solvent and 0.5-2.5 parts of crosslinking agent; The preparation method of fluorocarbon modified acrylate is as follows: 1) Weigh the acrylate monomer and solvent in proportion, mix the acrylate monomer and solvent to 1 / 2 of the total weight, add the initiator, stir evenly, and set aside; 2) Weigh the fluorinated monomer in proportion, add 1 / 2 of the total weight of the solvent, mix well, and set aside; 3) The reactor is heated to 65-70°C, and a crosslinking agent and the solution obtained in step 1) and step 2) are added, mixed evenly, and reacted for 2-3 hours. The reaction product is cooled to room temperature, and the solvent is removed by decompression and distillation to obtain a fluorocarbon-modified acrylate.

9. A method for preparing a light-absorbing matte black coating for an automobile instrument frame according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: S1. Mix 1 / 3 of the total weight of high-pigment carbon black, dispersant, and film-forming resin with 1 / 2 of the total weight of solvent at 45°C and a speed of 2200-2300 r / min for 30 minutes to form a uniform slurry; S2, sand-mill the slurry obtained in S1 using 0.4 mm zirconia beads for 2-4 h; S3, add leveling agent, defoaming agent, solvent, matte powder, fumed silica, silane coupling agent, fluorocarbon modified acrylate, ultraviolet absorber and remaining film-forming resin and solvent to the slurry obtained in S2, and stir at a speed of 500-550 r / min for 1-2 hours; S4. Filter the slurry obtained in S3 through a 280-300 mesh filter to remove dispersed particles and grinding medium fragments to obtain a light-absorbing matte black coating.

10. The method for preparing the light-absorbing matte black coating for automobile instrument frame according to claim 9, characterized in that: The particle size of the material obtained in step S2 is 3 μm.

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