Sizing agent for vinyl resin carbon fiber composite material as well as preparation method and application method of sizing agent

Abstract

The invention relates to a sizing agent for a vinyl resin carbon fiber composite material as well as a preparation method and an application method thereof, and belongs to the technical field of sizing agents. A preparation method of a sizing agent for a vinyl resin carbon fiber composite material comprises the following steps: (1) dissolving trimethylolpropane methoxypolyethylene glycol and an unsaturated olefin compound, and reacting at 70-75 DEG C for 1-2 hours to obtain an intermediate containing unsaturated double bonds; (2) dissolving an isocyanate monomer and epoxy resin, and reacting at 80-95 DEG C for 2-3 hours to obtain isocyanate group modified epoxy resin; (3) mixing the intermediate containing unsaturated double bonds with isocyanate group modified epoxy resin, and reacting at 75-85 DEG C for 2-3 hours; removing the organic solvent to obtain a sizing agent main material; and (4) mixing the sizing agent main material with vinyl resin, and carrying out phase inversion emulsification at 50-65 DEG C to obtain the sizing agent for the vinyl resin carbon fiber composite material. The interface bonding strength between the carbon fiber and the vinyl resin can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of sizing agents, and in particular to a sizing agent for vinyl resin carbon fiber composite materials and a preparation method and an application method thereof. Background Art

[0002] Carbon fiber composite materials have been widely used in the fields of automobiles, aircraft, ships, mechanical parts, turbine blades, high-end sporting goods, and the defense industry in recent years due to their advantages such as light weight, high mechanical strength, and simple production. The high corrosion resistance and high hydrolysis resistance of vinyl resin (VE) make CF / VE composite materials have higher corrosion resistance than CF / EP composite materials. The minimum moisture absorption rate of epoxy resin in the marine environment is 2-10%, unsaturated polyester resin is 2-3%, and vinyl ester resin is 0.3-2.5%. Compared with the more expensive epoxy resin, CF / VE composite materials are more widely used in marine structural composite materials.

[0003] However, the surface of carbon fiber is inert and its bonding strength with the matrix resin is relatively weak. It is necessary to use a sizing agent to treat the surface of carbon fiber to improve the interface bonding strength between carbon fiber and vinyl resin matrix. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the embodiments of the present application includes providing a sizing agent for a vinyl resin carbon fiber composite material and a preparation method and an application method thereof, which can effectively improve the interface bonding strength between the carbon fiber and the vinyl resin matrix.

[0005] In a first aspect, the present application provides a method for preparing a sizing agent for a vinyl resin carbon fiber composite material, comprising:

[0006] (1) dissolving trimethylolpropane polyethylene glycol monomethyl ether and an unsaturated olefin compound monomer in an organic solvent, reacting at 70-75° C. for 1-2 hours to obtain an intermediate containing an unsaturated double bond;

[0007] (2) dissolving the isocyanate monomer and the epoxy resin in an organic solvent, reacting at 80-95° C. for 2-3 hours to obtain an isocyanate-modified epoxy resin;

[0008] (3) mixing the intermediate containing unsaturated double bonds and the isocyanate-modified epoxy resin, and further reacting at 75-85° C. for 2-3 hours; separating and removing the organic solvent to obtain the main material of the sizing agent;

[0009] (4) The main ingredients of the sizing agent are mixed with the vinyl resin, and phase inversion emulsification is performed at 50-65° C. to obtain a sizing agent for a vinyl resin carbon fiber composite material.

[0010] The present application adopts epoxy resin as a matrix raw material, adopts isocyanate monomer to react with epoxy resin to modify the epoxy resin with isocyanate group, so as to improve the hydrophilicity of epoxy resin, and simultaneously adopts trimethylolpropane polyethylene glycol monomethyl ether to react with unsaturated olefin compound to obtain an intermediate containing more unsaturated double bonds, and then mixes the intermediate containing unsaturated double bonds with the isocyanate modified epoxy resin, which can not only introduce more unsaturated double bonds into the epoxy resin, but also introduce ether bonds by trimethylolpropane polyethylene glycol monomethyl ether to further improve the hydrophilicity of epoxy resin, thereby improving the bonding strength between the epoxy resin and the vinyl resin matrix; in addition, the introduction of vinyl resin can further improve the bonding strength between the sizing agent and the vinyl resin matrix, thereby effectively improving the interface bonding strength between the carbon fiber and the vinyl resin matrix.

[0011] In some embodiments of the present application, the molecular weight of trimethylolpropane polyethylene glycol monomethyl ether is 1000-8500.

[0012] The present application uses trimethylolpropane polyethylene glycol monomethyl ether with a suitable molecular weight to facilitate the preparation of a relatively stable sizing agent for vinyl resin carbon fiber composite materials.

[0013] In some embodiments of the present application, the unsaturated olefin-containing compound includes at least one of 3-isopropyl-dimethylbenzyl isocyanate, acrylic acid, glycidyl methacrylate, allyl polyethylene glycol, and N-hydroxymethyl acrylamide.

[0014] The present application uses at least one of the above unsaturated olefin-containing compounds to react with trimethylolpropane polyethylene glycol monomethyl ether to obtain an intermediate containing more unsaturated double bonds.

[0015] In some embodiments of the present application, the isocyanate monomer includes at least one of diphenylmethane diisocyanate, toluene diisocyanate, and isophorone diisocyanate.

[0016] The present application uses at least one of the above isocyanate monomers to react with epoxy resin to modify the epoxy resin with isocyanate groups, thereby improving the hydrophilicity of the epoxy resin.

[0017] In some embodiments of the present application, the epoxy resin includes at least one of bisphenol A epoxy resin and bisphenol F epoxy resin.

[0018] The present application adopts at least one of the above-mentioned epoxy resins as a matrix raw material to prepare a sizing agent for vinyl resin carbon fiber composite materials.

[0019] In some embodiments of the present application, the vinyl resin includes at least one of bisphenol A epoxy vinyl resin, flame retardant epoxy vinyl resin, phenolic epoxy vinyl resin, and polyurethane modified epoxy vinyl resin.

[0020] The present application provides a sizing agent prepared by mixing the main ingredient of the sizing agent with at least one of the above-mentioned vinyl resins and performing phase inversion emulsification, which can improve the bonding force between the sizing agent and the vinyl resin matrix, thereby further improving the interface bonding strength between the carbon fiber and the vinyl resin matrix.

[0021] In some embodiments of the present application, the organic solvent is selected from at least one of acetone, butanone, and cyclohexanone.

[0022] In a second aspect, an embodiment of the present application provides a sizing agent for a vinyl resin carbon fiber composite material prepared by the preparation method provided in the first aspect.

[0023] The sizing agent for vinyl resin carbon fiber composite materials prepared by the above method in the present application can effectively improve the interface bonding strength between carbon fibers and vinyl resin matrix.

[0024] In a third aspect, an embodiment of the present application provides a method for applying a sizing agent for a vinyl resin carbon fiber composite material as provided in the second aspect, comprising:

[0025] (1) impregnating carbon fiber in a sizing agent for a vinyl resin carbon fiber composite material, and drying after sizing;

[0026] (2) mixing a resin and a curing agent to form a resin mixture, impregnating the sized carbon fiber with the resin mixture, and curing and molding the mixture to obtain a carbon fiber composite material;

[0027] Among them, the resin includes vinyl resin.

[0028] The present application forms a vinyl resin carbon fiber composite material by using the above-mentioned sizing agent between carbon fiber and vinyl resin matrix. Since the above-mentioned sizing agent can effectively improve the interface bonding strength between carbon fiber and vinyl resin matrix, the obtained vinyl resin carbon fiber composite material has higher strength performance.

[0029] In some embodiments of the present application, in step (1), the solid content of the sizing agent for the vinyl resin carbon fiber composite material is 0.5%-1.0%.

[0030] The present application controls the solid content of the sizing agent within a suitable range, thereby facilitating stable application between the carbon fiber and the vinyl resin matrix to improve the interface bonding strength between the carbon fiber and the vinyl resin matrix. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0032] The present application provides a method for preparing a sizing agent for a vinyl resin carbon fiber composite material, comprising:

[0033] (1) dissolving trimethylolpropane polyethylene glycol monomethyl ether and an unsaturated olefin compound monomer in an organic solvent, reacting at 70-75° C. for 1-2 hours to obtain an intermediate containing an unsaturated double bond;

[0034] (2) dissolving the isocyanate monomer and the epoxy resin in an organic solvent, reacting at 80-95° C. for 2-3 hours to obtain an isocyanate-modified epoxy resin;

[0035] (3) mixing the intermediate containing unsaturated double bonds and the isocyanate-modified epoxy resin, and further reacting at 75-85° C. for 2-3 hours; separating and removing the organic solvent to obtain the main material of the sizing agent;

[0036] (4) The main ingredients of the sizing agent are mixed with the vinyl resin, and phase inversion emulsification is performed at 50-65° C. to obtain a sizing agent for a vinyl resin carbon fiber composite material.

[0037] Epoxy resin is used as a matrix raw material, isocyanate monomer is used to react with epoxy resin to modify epoxy resin with isocyanate group, so as to improve the hydrophilicity of epoxy resin, trimethylolpropane polyethylene glycol monomethyl ether is used to react with unsaturated olefin compound at the same time, because trimethylolpropane polyethylene glycol monomethyl ether has more reaction sites, so as to obtain an intermediate containing more unsaturated double bonds, and then the intermediate containing unsaturated double bonds and isocyanate group modified epoxy resin are mixed, so as to introduce more unsaturated double bonds into epoxy resin, and further improve the hydrophilicity of epoxy resin by introducing ether bond through trimethylolpropane polyethylene glycol monomethyl ether, and the epoxy resin with more unsaturated double bonds can participate in chemical reaction when combined with vinyl resin matrix, and the epoxy resin with strong hydrophilicity can emulsify the vinyl resin matrix, so as to synergistically improve the bonding force between the sizing agent and the vinyl resin matrix; in addition, the introduction of vinyl resin can further improve the bonding force between the sizing agent and the vinyl resin matrix, so as to effectively improve the interface bonding strength between the carbon fiber and the vinyl resin matrix.

[0038] In some embodiments of the present application, the molecular weight of trimethylolpropane polyethylene glycol monomethyl ether is 1000-8500. As an example, the molecular weight of trimethylolpropane polyethylene glycol monomethyl ether can be, but is not limited to, 1000, 1200, 1500, 1600, 1800, 2000, 2200, 2500, 2800, 3000, 3200, 3500, 3800, 4000, 4200, 4500, 4800, 5000, 5200, 5500, 5800, 6000, 6200, 6500, 6800, 7000, 7200, 7500, 7800, 8000, 8200, 8500. Using trimethylolpropane polyethylene glycol monomethyl ether with an appropriate molecular weight is conducive to the preparation of a relatively stable sizing agent for vinyl resin carbon fiber composite materials.

[0039] In some embodiments of the present application, the unsaturated olefin-containing compound includes at least one of 3-isopropyl-dimethylbenzyl isocyanate, acrylic acid, glycidyl methacrylate, allyl polyethylene glycol, and N-hydroxymethyl acrylamide. By reacting at least one of the unsaturated olefin-containing compounds with trimethylolpropane polyethylene glycol monomethyl ether, an intermediate containing a large number of unsaturated double bonds can be obtained.

[0040] In some embodiments of the present application, the isocyanate monomer includes at least one of diphenylmethane diisocyanate, toluene diisocyanate, and isophorone diisocyanate. The at least one isocyanate monomer is reacted with the epoxy resin to modify the epoxy resin with isocyanate groups, thereby improving the hydrophilicity of the epoxy resin.

[0041] In some embodiments of the present application, the epoxy resin includes at least one of bisphenol A epoxy resin and bisphenol F epoxy resin. As an example, bisphenol A epoxy resin can be but not limited to E44, E55, E51, E42, E35, E20, E12, E06, E03. Bisphenol F epoxy resin can be but not limited to NPEF-170, Flanders F3, Flanders F8, natural F200, natural F500, natural F1000, polymer F2, polymer F3, polymer F4. At least one of the above epoxy resins is used as a matrix raw material to prepare a sizing agent for vinyl resin carbon fiber composite materials.

[0042] In some embodiments of the present application, the vinyl resin includes at least one of bisphenol A epoxy vinyl resin, flame retardant epoxy vinyl resin, phenolic epoxy vinyl resin, and polyurethane modified epoxy vinyl resin. The sizing agent prepared by mixing the main material of the sizing agent with at least one of the above-mentioned vinyl resins and performing phase inversion emulsification can improve the bonding force between the sizing agent and the vinyl resin matrix, thereby further improving the interface bonding strength between the carbon fiber and the vinyl resin matrix.

[0043] In some embodiments of the present application, the organic solvent is selected from at least one of acetone, butanone, and cyclohexanone.

[0044] The embodiment of the present application provides a sizing agent for a vinyl resin carbon fiber composite material prepared by the above preparation method. The sizing agent for a vinyl resin carbon fiber composite material prepared by the above method can effectively improve the interface bonding strength between the carbon fiber and the vinyl resin matrix.

[0045] The present application embodiment provides an application method of the above-mentioned sizing agent for vinyl resin carbon fiber composite material, comprising:

[0046] (1) impregnating carbon fiber in a sizing agent for a vinyl resin carbon fiber composite material, and drying after sizing;

[0047] (2) mixing a resin and a curing agent to form a resin mixture, impregnating the sized carbon fiber with the resin mixture, and curing and molding the mixture to obtain a carbon fiber composite material;

[0048] Among them, the resin includes vinyl resin.

[0049] The above-mentioned sizing agent is applied between carbon fiber and vinyl resin matrix to form a vinyl resin carbon fiber composite material. Since the above-mentioned sizing agent can effectively improve the interface bonding strength between carbon fiber and vinyl resin matrix, the obtained vinyl resin carbon fiber composite material has higher strength performance.

[0050] In some embodiments of the present application, in step (1), the solid content of the sizing agent for vinyl resin carbon fiber composite material is 0.5%-1.0%. As an example, the solid content of the sizing agent for vinyl resin carbon fiber composite material can be, but is not limited to, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%. The solid content of the sizing agent is controlled within a suitable range, which is conducive to the stable application between the carbon fiber and the vinyl resin matrix to improve the interface bonding strength between the carbon fiber and the vinyl resin matrix.

[0051] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0052] Example 1

[0053] This embodiment provides a sizing agent for a vinyl resin carbon fiber composite material, and the preparation method thereof is as follows:

[0054] (1) 200 g of molten trimethylolpropane polyethylene glycol monomethyl ether (molecular weight 1200, Wengjiang reagent, CAS No. 25723-16-4), 20 g of 3-isopropyl-dimethylbenzyl isocyanate, and 25 g of allyl polyethylene glycol were dissolved in 200 g of cyclohexanone, and reacted at 75° C. for 1.5 h to obtain an intermediate containing an unsaturated double bond;

[0055] (2) 50 g of diphenylmethane diisocyanate and 100 g of epoxy resin E44 were dissolved in 200 g of cyclohexanone and reacted at 80° C. for 2 h to obtain an isocyanate-modified epoxy resin;

[0056] (3) mixing the intermediate containing an unsaturated double bond and the isocyanate-modified epoxy resin, and further reacting them at 80° C. for 2 h; separating and removing cyclohexanone to obtain the main material of the sizing agent;

[0057] (4) After 200 g of the main ingredient of the sizing agent and 150 g of bisphenol A epoxy vinyl resin (Aliance 430) were mixed and heated to melt, 525 g of deionized water was added and emulsified at 60° C. to obtain a sizing agent for vinyl resin carbon fiber composite materials with a solid content of 40%.

[0058] The sizing agent for the vinyl resin carbon fiber composite material provided in this embodiment is denoted as A.

[0059] Example 2

[0060] This embodiment provides a sizing agent for a vinyl resin carbon fiber composite material, and the preparation method thereof is as follows:

[0061] (1) 200 g of molten trimethylolpropane polyethylene glycol monomethyl ether (molecular weight 8000), 20 g of 3-isopropyl-dimethylbenzyl isocyanate, and 25 g of allyl polyethylene glycol were dissolved in 200 g of cyclohexanone, and reacted at 75° C. for 1.5 h to obtain an intermediate containing an unsaturated double bond;

[0062] (2) 50 g of diphenylmethane diisocyanate and 100 g of epoxy resin E44 were dissolved in 200 g of cyclohexanone and reacted at 80° C. for 2 h to obtain an isocyanate-modified epoxy resin;

[0063] (3) mixing the intermediate containing an unsaturated double bond and the isocyanate-modified epoxy resin, and further reacting them at 80° C. for 2 h; separating and removing cyclohexanone to obtain the main material of the sizing agent;

[0064] (4) After 200 g of the main ingredient of the sizing agent and 150 g of bisphenol A epoxy vinyl resin (Aliance 430) were mixed and heated to melt, 525 g of deionized water was added and emulsified at 60° C. to obtain a sizing agent for vinyl resin carbon fiber composite materials with a solid content of 40%.

[0065] The sizing agent for the vinyl resin carbon fiber composite material provided in this embodiment is denoted as B.

[0066] Example 3

[0067] This embodiment provides a sizing agent for a vinyl resin carbon fiber composite material, and the preparation method thereof is as follows:

[0068] (1) dissolving 200 g of molten trimethylolpropane polyethylene glycol monomethyl ether (molecular weight 1200), 20 g of glycidyl methacrylate, and 25 g of N-hydroxymethyl acrylamide in 200 g of cyclohexanone, and reacting at 75° C. for 1.5 h to obtain an intermediate containing an unsaturated double bond;

[0069] (2) dissolving 50 g of toluene diisocyanate and 100 g of epoxy resin Flandre F3 in 200 g of cyclohexanone, and reacting at 80° C. for 2 h to obtain an isocyanate-modified epoxy resin;

[0070] (3) mixing the intermediate containing an unsaturated double bond and the isocyanate-modified epoxy resin, and further reacting them at 80° C. for 2 h; separating and removing cyclohexanone to obtain the main material of the sizing agent;

[0071] (4) After 200 g of the main ingredient of the sizing agent and 150 g of phenolic epoxy vinyl resin (SQAN-201) were mixed and heated to melt, 525 g of deionized water was added and emulsified at 60° C. to obtain a sizing agent for vinyl resin carbon fiber composite materials with a solid content of 40%.

[0072] The sizing agent for the vinyl resin carbon fiber composite material provided in this embodiment is denoted as C.

[0073] Comparative Example 1

[0074] The carbon fiber sizing agent provided in this comparative example is a purchased commercial sizing agent (MU903).

[0075] The preparation methods of Examples 1-3 are shown in Table 1.

[0076] Table 1 Preparation method of Examples 1-3

[0077]

[0078] Test Example 1

[0079] In this test example, the sizing agents provided in Examples 1-3 and Comparative Example 1 were diluted to a content of 1.0%, and the particle size and stability of the sizing agent emulsion were tested; and the sizing agents were attached to T700×12K carbon fiber tows by an infiltration method, dried at 200°C, and then the sizing carbon fiber hair quantity and fiber hardness were tested. The results are shown in Table 1.

[0080] Wherein, (1) the particle size of the sizing agent emulsion is tested using a laser particle size analyzer Microtrac S3500, and the emulsion sample is automatically diluted to a suitable concentration for testing.

[0081] (2) The sizing agent emulsion is allowed to stand for 1 month and the emulsion stability is observed. An emulsion without stratification and without precipitation at the bottom is excellent in stability, an emulsion without stratification but with precipitation at the bottom is good in stability, and an emulsion with stratification and precipitation at the bottom is poor in stability.

[0082] (3) Test the hardness and fuzz quantification of sized carbon fiber according to the hardness and fuzz quantification methods in Carbon Fiber and Graphite Fiber.

[0083] Table 1 Sizing agent properties

[0084] sample Emulsion particle size (nm) Emulsion stability Fiber hardness(cm) Wool quantity (mg / 50m) Example 1 211 excellent 12 3.4 Example 2 162 excellent 12.5 2.8 Example 3 215 excellent 13 3.1 Comparative Example 1 221 excellent 11 6.0

[0085] From the results in Table 1, it can be seen that the sizing agent emulsion for vinyl resin carbon fiber composite material prepared in the present application has an appropriate particle size and excellent stability; the carbon fiber impregnated with the sizing agent prepared in the present application has a low hardness, good flexibility, and less hair. This indicates that the sizing agent emulsion for vinyl resin carbon fiber composite material prepared in the present application can have better compatibility with vinyl resin, thereby facilitating the improvement of the interface bonding strength between the carbon fiber and the vinyl resin matrix.

[0086] Implementation Group 1

[0087] The present implementation group provides an application method of a sizing agent for a vinyl resin carbon fiber composite material, comprising:

[0088] (1) The carbon fibers were respectively impregnated with the sizing agents for the vinyl resin carbon fiber composite materials provided in 1-3 and Comparative Example 1 (see Table 1), and then dried after sizing;

[0089] (2) A vinyl resin (Aliance 430) and a curing agent (Butanox LPT-IN) are mixed to form a vinyl resin mixture, and the sized carbon fibers are respectively impregnated with the vinyl resin mixture and cured to obtain a carbon fiber composite material.

[0090] Test Example 2

[0091] In this test example, the interlaminar shear strength between the sized carbon fiber and the vinyl resin matrix was tested for each carbon fiber composite material provided in implementation group 1 according to GB / T 30969. The results are shown in Table 2.

[0092] Table 2 Sizing agent properties

[0093] sample Resin Sizing agent Interlaminar shear strength(Mpa) 1 Vinyl resin Example 1 110 2 Vinyl resin Example 2 102 3 Vinyl resin Example 3 106 4 Epoxy resin Comparative Example 1 95

[0094] From the results in Table 2, it can be seen that the sizing agent for the vinyl resin carbon fiber composite material prepared in the present application is applied to the vinyl resin carbon fiber composite material formed between the carbon fiber and the vinyl resin matrix, and its layer shear strength is relatively high. This indicates that the sizing agent for the vinyl resin carbon fiber composite material prepared in the present application can effectively improve the interface bonding strength between the carbon fiber and the vinyl resin matrix.

[0095] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

Claims

1. A method for preparing a sizing agent for vinyl resin carbon fiber composite materials, characterized in that: include: (1) dissolving trimethylolpropane polyethylene glycol monomethyl ether and an unsaturated olefin compound monomer in an organic solvent, reacting at 70-75° C. for 1-2 hours to obtain an intermediate containing an unsaturated double bond; (2) dissolving the isocyanate monomer and the epoxy resin in an organic solvent, reacting at 80-95° C. for 2-3 hours to obtain an isocyanate-modified epoxy resin; (3) mixing the intermediate containing unsaturated double bonds and the isocyanate-modified epoxy resin, and further reacting at 75-85° C. for 2-3 hours; separating and removing the organic solvent to obtain the main material of the sizing agent; (4) The main ingredient of the sizing agent is mixed with a vinyl resin, and phase inversion emulsification is performed at 50-65° C. to obtain a sizing agent for a vinyl resin carbon fiber composite material.

2. The preparation method according to claim 1, characterized in that: The molecular weight of the trimethylolpropane polyethylene glycol monomethyl ether is 1000-8500.

3. The preparation method according to claim 1, characterized in that: The unsaturated olefin compound includes at least one of 3-isopropyl-dimethylbenzyl isocyanate, acrylic acid, glycidyl methacrylate, allyl polyethylene glycol, and N-hydroxymethyl acrylamide.

4. The preparation method according to claim 1, characterized in that: The isocyanate monomer includes at least one of diphenylmethane diisocyanate, toluene diisocyanate and isophorone diisocyanate.

5. The preparation method according to claim 1, characterized in that: The epoxy resin includes at least one of bisphenol A epoxy resin and bisphenol F epoxy resin.

6. The preparation method according to claim 1, characterized in that: The vinyl resin includes at least one of bisphenol A epoxy vinyl resin, flame retardant epoxy vinyl resin, phenolic epoxy vinyl resin, and polyurethane modified epoxy vinyl resin.

7. The preparation method according to claim 1, characterized in that: The organic solvent is selected from at least one of acetone, butanone and cyclohexanone.

8. A sizing agent for vinyl resin carbon fiber composite material prepared by the preparation method according to any one of claims 1 to 7.

9. A method for applying the sizing agent for vinyl resin carbon fiber composite materials according to claim 8, characterized in that: include: (1) impregnating carbon fiber into the sizing agent for the vinyl resin carbon fiber composite material, and drying after sizing; (2) mixing a resin and a curing agent to form a resin mixture, impregnating the sized carbon fiber with the resin mixture, and curing and molding the carbon fiber to obtain a carbon fiber composite material; Wherein, the resin comprises vinyl resin.

10. The application method according to claim 9, characterized in that: In the step (1), the solid content of the sizing agent for the vinyl resin carbon fiber composite material is 0.5%-1.0%.

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