A highly weatherable transparent coating composition, and methods of making and using the same

Abstract

The application relates to the technical field of carbon fiber composite material surface coating, and specifically discloses a high-weather-resistance transparent coating composition and a preparation method and application thereof. The high-weather-resistance transparent coating composition is prepared from the following components in parts by weight: 20-30 parts of solvent, 35-45 parts of fluorocarbon resin, 5-10 parts of methyl methacrylate, 0.1-1 part of ultraviolet light absorber and 5-8 parts of modified filler. The raw material of the modified filler comprises polyurethane, ethanol, silicon oxide nanofiber and cerium trioxide. The preparation method of the high-weather-resistance transparent coating composition comprises the following steps: firstly, the fluorocarbon resin is added into the solvent and stirred and mixed uniformly to dissolve the fluorocarbon resin; then, the methyl methacrylate, the ultraviolet light absorber, the modified filler and the leveling agent are added and stirred and mixed uniformly to obtain the coating composition.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of surface coating of carbon fiber composite materials, in particular to a high-weather-resistance transparent coating composition and a preparation method and application thereof. BACKGROUND

[0002] The carbon fiber composite material is a new type of material formed by processing carbon fibers and a matrix resin through various forming processes. Due to its excellent properties such as low density, high strength and high rigidity, the carbon fiber composite material has become one of the most popular lightweight materials in the fields of rail transit and automobile parts. At present, the carbon fiber composite material applied to rail transit and automobile exterior parts basically adopts epoxy resin as the matrix resin. However, due to the structure of the epoxy resin itself, the weather resistance of the epoxy-based carbon fiber composite material is not good. Under the condition of long-term outdoor exposure to sunlight, aging problems are easily caused, mainly manifested as yellowing, loss of gloss, cracking and powdering, and therefore it is urgent to research a method for improving the weather resistance of the carbon fiber composite material. SUMMARY

[0003] In order to improve the weather resistance of the carbon fiber composite material, the application provides a high-weather-resistance transparent coating composition and a preparation method and application thereof.

[0004] In a first aspect, the application provides a high-weather-resistance transparent coating composition, which adopts the following technical solution:

[0005] A high-weather-resistance transparent coating composition, raw materials of the composition include the following components in parts by weight: 20-30 parts of solvent, 35-45 parts of fluorocarbon resin, 5-10 parts of methyl methacrylate, 0.1-1 part of ultraviolet light absorber and 5-8 parts of modified filler; raw materials of the modified filler include polyurethane, ethanol, silicon oxide nanofiber and cerium sesquioxide.

[0006] By adopting the above technical solution, ethanol is used as a solvent to dissolve polyurethane, and then polyurethane is used to modify silicon oxide nanofiber and cerium sesquioxide, so as to improve the dispersion performance of silicon oxide nanofiber and cerium sesquioxide, make silicon oxide nanofiber and cerium sesquioxide uniformly dispersed in the coating composition, and improve the shielding effect of the coating on ultraviolet light by using the cooperation of silicon oxide nanofiber and cerium sesquioxide; polyurethane and fluorocarbon resin have good weather resistance, and the cooperation of methyl methacrylate and ultraviolet light absorber improves the weather resistance of the coating composition, so that the weather resistance of the carbon fiber composite material can be improved by coating the coating composition on the carbon fiber composite material.

[0007] In a specific implementation scheme, the preparation method of the modified filler includes the following steps:

[0008] Dissolve the polyurethane in ethanol to obtain a modified liquid, then mix the silica nanofiber and cerium trioxide uniformly by stirring, to obtain a mixture, spray the modified liquid into the mixture during the stirring process, continue to stir after the spraying is completed, and finally dry to obtain a modified filler.

[0009] By adopting the technical scheme, the polyurethane is dissolved in ethanol to obtain a modified liquid, then the modified liquid is sprayed into the mixture composed of the silica nanofiber and the cerium trioxide, and dried, so that the polyurethane wraps the silica nanofiber and the cerium trioxide, the modification of the silica nanofiber and the cerium trioxide is completed, and the modified filler with good dispersion effect is prepared.

[0010] In a specific implementation, the weight ratio of the modified liquid to the mixture is 1:(12-14).

[0011] By adopting the technical scheme, the ratio of the modified liquid to the mixture is further limited, so that the polyurethane can better wrap the silica nanofiber and the cerium trioxide, thereby improving the modification effect.

[0012] In a specific implementation, the ultraviolet light absorber includes one or more of 2-hydroxy-4'-methoxybenzophenone, 2,4-di-tert-butyl-6-(5-chlorobenzotriazol-2-yl)phenol, and 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole.

[0013] In a specific implementation, the solvent includes one or more of chloroform, xylene, and ethyl acetate.

[0014] By adopting the technical scheme, chloroform, xylene, and ethyl acetate have good solubility for fluorocarbon resin, thereby improving the performance of the prepared coating composition.

[0015] In a specific implementation, the raw materials of the composition further include 0.1-0.2 parts by weight of a leveling agent, and the leveling agent includes polyether-modified polydimethylsiloxane.

[0016] By adopting the technical scheme, the addition of polyether-modified polydimethylsiloxane can improve the adhesion effect and gloss of the coating composition on the carbon fiber composite material.

[0017] In a second aspect, the application provides a preparation method of a high-weather-resistant transparent coating composition, which adopts the following technical scheme:

[0018] The preparation method of the high-weather-resistant transparent coating composition includes the following steps:

[0019] The fluorocarbon resin is first added into the solvent, stirred and mixed uniformly to dissolve the fluorocarbon resin, then methyl methacrylate, ultraviolet light absorber, modified filler and leveling agent are added, stirred and mixed uniformly to obtain the coating composition.

[0020] By adopting the technical scheme, the fluorocarbon resin is first dissolved in the solvent, then methyl methacrylate, ultraviolet light absorber, modified filler and leveling agent are added, stirred and mixed uniformly to obtain the coating composition with good weather resistance.

[0021] In a third aspect, the application provides an application of the high-weather-resistance transparent coating composition, which adopts the following technical scheme: an application of the high-weather-resistance transparent coating composition, the composition is coated on the surface of the carbon fiber composite material to form a coating layer.

[0022] By adopting the technical scheme, the coating layer formed by the coating composition in the application can improve the weather resistance of the carbon fiber composite material.

[0023] In summary, the application has at least one of the following beneficial technical effects:

[0024] 1. In the application, ethanol is used as a solvent to dissolve polyurethane, and then the polyurethane is used to modify the silicon oxide nanofiber and cerium sesquioxide, thereby improving the dispersion effect of the silicon oxide nanofiber and cerium sesquioxide, making the silicon oxide nanofiber and cerium sesquioxide uniformly dispersed in the coating composition, and the combination of the silicon oxide nanofiber and cerium sesquioxide can improve the shielding effect of the coating on ultraviolet rays; the polyurethane and fluorocarbon resin themselves have good weather resistance, and the combination of methyl methacrylate and ultraviolet light absorber improves the weather resistance of the coating composition, so that the coating composition coated on the carbon fiber composite material can improve the weather resistance of the carbon fiber composite material.

[0025] 2. In the application, the fluorocarbon resin is first dissolved in the solvent, then methyl methacrylate, ultraviolet light absorber, modified filler and leveling agent are added, stirred and mixed uniformly to obtain the coating composition with good weather resistance.

[0026] 3. In the application, the composition is coated on the surface of the carbon fiber composite material to form a coating layer, thereby improving the weather resistance of the carbon fiber composite material. DETAILED DESCRIPTION

[0027] The application will be further described in detail below in combination with the embodiments.

[0028] All raw materials in the examples can be obtained commercially. The UV absorber includes, but is not limited to, a mixture of one or more of 2-hydroxy-4'-methoxybenzophenone, 2,4-di-tert-butyl-6-(5-chlorobenzotriazol-2-yl)phenol, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, and preferably 2-hydroxy-4'-methoxybenzophenone in the present application.

[0029] Preparation Example

[0030] Preparation Example 1

[0031] Preparation Example 1 provides a method for preparing a modified filler, comprising the following steps:

[0032] The polyurethane is dissolved in ethanol to obtain a modification liquid; wherein the weight ratio of the polyurethane solution and ethanol is 1:3; then the silicon oxide nanofiber and cerium sesquioxide are added into a blender to be stirred and mixed uniformly to obtain a mixture, in the process of stirring, the modification liquid is sprayed into the mixture, after the spraying is completed, the stirring is continued for 0.5 h, finally, the modified filler is obtained by drying at 100℃; wherein the weight ratio of the modification liquid and the mixture is 1:11; the weight ratio of the silicon oxide nanofiber and cerium sesquioxide is 1:1.

[0033] Preparation Example 2

[0034] Preparation Example 2 provides a method for preparing a modified filler, comprising the following steps:

[0035] The polyurethane is dissolved in ethanol to obtain a modification liquid; wherein the weight ratio of the polyurethane solution and ethanol is 1:3; then the silicon oxide nanofiber and cerium sesquioxide are added into a blender to be stirred and mixed uniformly to obtain a mixture, in the process of stirring, the modification liquid is sprayed into the mixture, after the spraying is completed, the stirring is continued for 0.5 h, finally, the modified filler is obtained by drying at 100℃; wherein the weight ratio of the modification liquid and the mixture is 1:12; the weight ratio of the silicon oxide nanofiber and cerium sesquioxide is 1:1.

[0036] Preparation Example 3

[0037] Preparation Example 3 provides a method for preparing a modified filler, comprising the following steps:

[0038] The polyurethane is dissolved in ethanol to obtain a modification liquid; wherein the weight ratio of the polyurethane solution and ethanol is 1:3; then the silicon oxide nanofiber and cerium sesquioxide are added into a blender to be stirred and mixed uniformly to obtain a mixture, in the process of stirring, the modification liquid is sprayed into the mixture, after the spraying is completed, the stirring is continued for 0.5 h, finally, the modified filler is obtained by drying at 100℃; wherein the weight ratio of the modification liquid and the mixture is 1:13; the weight ratio of the silicon oxide nanofiber and cerium sesquioxide is 1:1.

[0039] Preparation Example 4

[0040] Preparation Example 4 provides a preparation method of a modified filler, comprising the following steps:

[0041] dissolve the polyurethane in ethanol to obtain a modification liquid; wherein the weight ratio of the polyurethane solution and ethanol is 1:3; then add the silicon oxide nanofiber and cerium sesquioxide into a blender to stir and mix uniformly to obtain a mixture, in the process of stirring, spray the modification liquid into the mixture, after the spraying is completed, continue to stir for 0.5h, and finally dry at 100℃ to obtain the modified filler; wherein the weight ratio of the modification liquid and the mixture is 1:14; the weight ratio of the silicon oxide nanofiber and cerium sesquioxide is 1:1.

[0042] Preparation Example 5

[0043] Preparation Example 5 provides a preparation method of a modified filler, comprising the following steps:

[0044] dissolve the polyurethane in ethanol to obtain a modification liquid; wherein the weight ratio of the polyurethane solution and ethanol is 1:3; then add the silicon oxide nanofiber and cerium sesquioxide into a blender to stir and mix uniformly to obtain a mixture, in the process of stirring, spray the modification liquid into the mixture, after the spraying is completed, continue to stir for 0.5h, and finally dry at 100℃ to obtain the modified filler; wherein the weight ratio of the modification liquid and the mixture is 1:14; the weight ratio of the silicon oxide nanofiber and cerium sesquioxide is 1:1.

[0045] Preparation Example 6

[0046] Preparation Example 6 provides a preparation method of a modified filler, comprising the following steps:

[0047] dissolve the polyurethane in ethanol to obtain a modification liquid; wherein the weight ratio of the polyurethane solution and ethanol is 1:3; then add the silicon oxide nanofiber and cerium sesquioxide into a blender to stir and mix uniformly to obtain a mixture, in the process of stirring, spray the modification liquid into the mixture, after the spraying is completed, continue to stir for 0.5h, and finally dry at 100℃ to obtain the modified filler; wherein the weight ratio of the modification liquid and the mixture is 1:14; the weight ratio of the silicon oxide nanofiber and cerium sesquioxide is 1:1.

[0048] Preparation Example 7

[0049] Preparation Example 7 provides a preparation method of a modified filler, comprising the following steps:

[0050] The polyurethane is dissolved in ethanol to obtain a modification liquid; the weight ratio of the polyurethane and the ethanol is 1:3; then the cerium trioxide is added into the blender and stirred to be uniformly mixed to obtain a mixture; in the process of stirring, the modification liquid is sprayed into the mixture; after the spraying is completed, the stirring is continued for 0.5 h; finally, the mixture is dried at 100 ℃ to obtain the modified filler; the weight ratio of the modification liquid and the mixture is 1:13; the weight ratio of the silicon oxide nanofiber and the cerium trioxide is 1:1.

[0051] Embodiment

[0052] Embodiment 1

[0053] Embodiment 1 provides a preparation method of a high-weather-resistant transparent coating composition, comprising the following steps:

[0054] First, 35 kg of fluorocarbon resin is added into 20 kg of solvent, and stirred to be uniformly mixed so that the fluorocarbon resin is dissolved; then 5 kg of methyl methacrylate, 0.1 kg of ultraviolet light absorber and 5 kg of the modified filler in Preparation Example 1 are added and stirred to be uniformly mixed to obtain a coating composition; wherein the solvent is a mixture of dimethylbenzene and ethyl acetate, and the weight ratio of the dimethylbenzene and the ethyl acetate is 2:1.5; the ultraviolet light absorber is 2-hydroxy-4'-methoxybenzophenone.

[0055] Embodiment 2

[0056] Embodiment 2 provides a preparation method of a high-weather-resistant transparent coating composition, comprising the following steps:

[0057] First, 35 kg of fluorocarbon resin is added into 20 kg of solvent, and stirred to be uniformly mixed so that the fluorocarbon resin is dissolved; then 5 kg of methyl methacrylate, 0.1 kg of ultraviolet light absorber and 5 kg of the modified filler in Preparation Example 1 are added and stirred to be uniformly mixed to obtain a coating composition; wherein the solvent is a mixture of dimethylbenzene and ethyl acetate, and the weight ratio of the dimethylbenzene and the ethyl acetate is 2:1.5; the ultraviolet light absorber is 2-hydroxy-4'-methoxybenzophenone.

[0058] Embodiment 3

[0059] Embodiment 3 provides a preparation method of a high-weather-resistant transparent coating composition, comprising the following steps:

[0060] First, 35 kg of fluorocarbon resin is added into 20 kg of solvent, and stirred to be uniformly mixed so that the fluorocarbon resin is dissolved; then 5 kg of methyl methacrylate, 0.1 kg of ultraviolet light absorber and 5 kg of the modified filler in Preparation Example 1 are added and stirred to be uniformly mixed to obtain a coating composition; wherein the solvent is a mixture of dimethylbenzene and ethyl acetate, and the weight ratio of the dimethylbenzene and the ethyl acetate is 2:1.5; the ultraviolet light absorber is 2-hydroxy-4'-methoxybenzophenone.

[0061] Example 4

[0062] Example 4 provides a method for preparing a high weatherable transparent coating composition, comprising the following steps:

[0063] First, 35 kg of fluorocarbon resin is added to 20 kg of solvent, stirred and mixed uniformly to dissolve the fluorocarbon resin, then 5 kg of methyl methacrylate, 0.1 kg of ultraviolet light absorber, and 5 kg of modified filler in Preparation Example 4 are added and stirred and mixed uniformly to obtain a coating composition; wherein the solvent is a mixture of xylene and ethyl acetate, and the weight ratio of xylene to ethyl acetate is 2:1.5; the ultraviolet light absorber is 2-hydroxy-4'-methoxybenzophenone.

[0064] Example 5

[0065] Example 5 provides a method for preparing a high weatherable transparent coating composition, comprising the following steps:

[0066] First, 35 kg of fluorocarbon resin is added to 20 kg of solvent, stirred and mixed uniformly to dissolve the fluorocarbon resin, then 5 kg of methyl methacrylate, 0.1 kg of ultraviolet light absorber, and 5 kg of modified filler in Preparation Example 5 are added and stirred and mixed uniformly to obtain a coating composition; wherein the solvent is a mixture of xylene and ethyl acetate, and the weight ratio of xylene to ethyl acetate is 2:1.5; the ultraviolet light absorber is 2-hydroxy-4'-methoxybenzophenone.

[0067] Example 6

[0068] Example 6 provides a method for preparing a high weatherable transparent coating composition, comprising the following steps:

[0069] First, 35 kg of fluorocarbon resin is added to 20 kg of solvent, stirred and mixed uniformly to dissolve the fluorocarbon resin, then 5 kg of methyl methacrylate, 0.1 kg of ultraviolet light absorber, and 5 kg of modified filler in Preparation Example 6 are added and stirred and mixed uniformly to obtain a coating composition; wherein the solvent is a mixture of xylene and ethyl acetate, and the weight ratio of xylene to ethyl acetate is 2:1.5; the ultraviolet light absorber is 2-hydroxy-4'-methoxybenzophenone.

[0070] Example 7

[0071] Example 7 provides a method for preparing a high weatherable transparent coating composition, comprising the following steps:

[0072] First, 35 kg of fluorocarbon resin was added to 20 kg of solvent and stirred until the fluorocarbon resin dissolved. Then, 5 kg of methyl methacrylate, 0.1 kg of ultraviolet absorber, and 5 kg of the modified filler from Preparation Example 7 were added and stirred until the mixture was homogeneous to obtain the coating composition. The solvent was a mixture of xylene and ethyl acetate, and the weight ratio of xylene to ethyl acetate was 2:1.5. The ultraviolet absorber was 2-hydroxy-4'-methoxybenzophenone.

[0073] Example 8

[0074] Example 8 provides a method for preparing a highly weather-resistant transparent coating composition, comprising the following steps:

[0075] First, 40 kg of fluorocarbon resin was added to 25 kg of solvent and stirred until the fluorocarbon resin dissolved. Then, 8 kg of methyl methacrylate, 0.5 kg of ultraviolet absorber, and 6.5 kg of the modified filler from Preparation Example 3 were added and stirred until the mixture was homogeneous to obtain the coating composition. The solvent was a mixture of xylene and ethyl acetate, and the weight ratio of xylene to ethyl acetate was 2:1.5. The ultraviolet absorber was 2-hydroxy-4'-methoxybenzophenone.

[0076] Example 9

[0077] Example 9 provides a method for preparing a highly weather-resistant transparent coating composition, comprising the following steps:

[0078] First, 45 kg of fluorocarbon resin was added to 30 kg of solvent and stirred until the fluorocarbon resin dissolved. Then, 10 kg of methyl methacrylate, 1 kg of ultraviolet absorber, and 8 kg of the modified filler from Preparation Example 3 were added and stirred until the mixture was homogeneous to obtain the coating composition. The solvent was a mixture of xylene and ethyl acetate, and the weight ratio of xylene to ethyl acetate was 2:1.5. The ultraviolet absorber was 2-hydroxy-4'-methoxybenzophenone.

[0079] Example 10

[0080] Example 10 provides a method for preparing a highly weather-resistant transparent coating composition, comprising the following steps:

[0081] First, 40 kg of fluorocarbon resin was added to 25 kg of solvent and stirred until dissolved. Then, 8 kg of methyl methacrylate, 0.5 kg of ultraviolet absorber, 6.5 kg of the modified filler from Preparation Example 3, and 0.15 kg of leveling agent were added and stirred until dissolved to obtain a coating composition. The solvent was a mixture of xylene and ethyl acetate, with a weight ratio of xylene to ethyl acetate of 2:1.5. The ultraviolet absorber was 2-hydroxy-4'-methoxybenzophenone, and the leveling agent was polyether-modified polydimethylsiloxane.

[0082] Comparative Example

[0083] Comparative Example 1

[0084] Comparative Example 1 provides a method for preparing a high-weather-resistant transparent coating composition, comprising the following steps:

[0085] First, 35 kg of fluorocarbon resin is added to 20 kg of solvent, stirred and mixed uniformly to dissolve the fluorocarbon resin, then 5 kg of methyl methacrylate, 0.1 kg of ultraviolet light absorber, and 5 kg of filler are added, stirred and mixed uniformly to obtain a coating composition; wherein the solvent is a mixture of xylene and ethyl acetate, and the weight ratio of xylene to ethyl acetate is 2:1.5; the ultraviolet light absorber is 2-hydroxy-4'-methoxybenzophenone; the filler is a mixture of silicon oxide nanofiber and cerium sesquioxide, and the weight ratio of silicon oxide nanofiber to cerium sesquioxide is 1:1.

[0086] Comparative Example 2

[0087] Comparative Example 2 provides a method for preparing a high-weather-resistant transparent coating composition, comprising the following steps:

[0088] First, 40 kg of fluorocarbon resin is added to 20 kg of solvent, stirred and mixed uniformly to dissolve the fluorocarbon resin, then 0.1 kg of ultraviolet light absorber and 5 kg of modified filler in Preparation Example 1 are added, stirred and mixed uniformly to obtain a coating composition; wherein the solvent is a mixture of xylene and ethyl acetate, and the weight ratio of xylene to ethyl acetate is 2:1.5; the ultraviolet light absorber is 2-hydroxy-4'-methoxybenzophenone.

[0089] Application Example

[0090] Application Example 1

[0091] Application Example 1 provides an application of a high-weather-resistant transparent coating composition, comprising the following steps:

[0092] The coating composition in Example 1 is applied to the surface of the carbon fiber composite material to form a coating layer.

[0093] Application Examples 2-12

[0094] Referring to Table 1, the difference between Application Examples 2-12 and Application Example 1 is that the coating compositions are different.

[0095] Table 1 Selection of Coating Composition

[0096]

[0097]

[0098] Performance test

[0099] Weather resistance: the carbon fiber composite materials in each application example were subjected to xenon lamp aging test, and the ΔE and gloss loss rate after 2100h were obtained, the lower the ΔE and gloss loss rate, the better the weather resistance of the coating composition.

[0100] Table 2 Performance test results of coating compositions

[0101] Sample △E Gloss loss rate (%) Example 1 0.95 9.5 Example 2 0.56 5.3 Example 3 0.50 5.0 Example 4 0.58 5.5 Example 5 0.87 8.2 Example 6 0.68 5.9 Example 7 0.70 6.0 Example 8 0.41 4.2 Example 9 0.47 4.5 Example 10 0.38 4.0 Example 11 2.52 28.8 Example 12 1.62 15.5

[0102] In combination with application example 1 and application examples 11-12, the weather resistance of the coating composition in application example 1 is the best, which shows that when preparing the coating composition, adding methyl methacrylate and polyurethane modified silicon oxide nanofiber, cerium sesquioxide, silicon oxide nanofiber and cerium sesquioxide can improve the shielding effect of the coating on ultraviolet light, polyurethane itself has good weather resistance, and the combination of methyl methacrylate and ultraviolet light absorber improves the weather resistance of the coating composition.

[0103] In combination with application examples 1-5, the weather resistance of the coating composition in application examples 2-4 is better, which shows that when preparing the modified filler, the ratio of the modification liquid to the mixture is preferably 1:(12-14), and the performance of the modified filler prepared is better, so that the weather resistance of the finally prepared coating composition is better.

[0104] In combination with application example 3, application example 6 and application example 7, the weather resistance of the coating composition in application example 3 is the best, which shows that when preparing the modified filler, the raw material is preferably a mixture of silicon oxide nanofiber and cerium sesquioxide, and the weather resistance of the modified filler prepared is better.

[0105] In combination with application example 3, application example 8 and application example 9, the weather resistance of the coating composition in application example 8 is the best, which shows that when preparing the coating composition, increasing the amount of raw materials, the weather resistance of the coating composition prepared shows a trend of first increasing and then decreasing.

[0106] In combination with application example 8 and application example 10, the weather resistance of the coating composition in application example 10 is better, which shows that when preparing the coating composition, adding leveling agent polyether modified polydimethylsiloxane to the raw material can improve the weather resistance of the coating composition.

[0107] This embodiment is only an explanation of the present application, which is not a limitation of the present application, and those skilled in the art can make modifications to this embodiment without creative contribution after reading the present specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A high weatherable clear coating composition for carbon fiber composites, characterized by: The raw materials of the composition include the following components in parts by weight: 20-30 parts of solvent, 35-45 parts of fluorocarbon resin, 5-10 parts of methyl methacrylate, 0.1-1 part of ultraviolet light absorber, and 5-8 parts of modified filler; the raw materials of the modified filler include polyurethane, ethanol, silicon oxide nanofiber, and cerium sesquioxide; the preparation method of the modified filler includes the following steps: dissolving the polyurethane in the ethanol to obtain a modified liquid, then uniformly stirring and mixing the silicon oxide nanofiber and the cerium sesquioxide to obtain a mixture, spraying the modified liquid into the mixture during stirring, continuing to stir after the spraying is completed, and finally drying to obtain the modified filler; the weight ratio of the modified liquid to the mixture is 1: (12-14).

2. A high weatherable clear coating composition for carbon fiber composites according to claim 1, characterized in that: The ultraviolet light absorber includes one or more of 2-hydroxy-4'-methoxybenzophenone, 2,4-di-tert-butyl-6-(5-chlorobenzotriazol-2-yl)phenol, and 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole.

3. A high weatherable clear coating composition for carbon fiber composites according to claim 1, characterized in that: The solvent includes one or more of chloroform, xylene, and ethyl acetate.

4. A high weatherable clear coating composition for carbon fiber composites according to claim 1, characterized in that: The raw materials of the composition further include 0.1-0.2 parts by weight of a leveling agent, and the leveling agent includes polyether-modified polydimethylsiloxane.

5. A method for preparing a high weatherable clear coating composition for carbon fiber composites as claimed in any one of claims 1 to 4, characterized in that: The method includes the following steps: First, the fluorocarbon resin is added to the solvent and stirred and mixed uniformly to dissolve the fluorocarbon resin, then the methyl methacrylate, the ultraviolet light absorber, the modified filler, and the leveling agent are added and stirred and mixed uniformly to obtain a coating composition.

6. Use of a high weatherable clear coating composition for carbon fiber composites according to any one of claims 1 to 4, characterized in that: The composition is coated on the surface of the carbon fiber composite material to form a coating layer.

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