Preparation method and application of water-soluble carbon fiber sizing agent

[0019] Specific embodiment one: a kind of carbon fiber sizing agent, it is made by the mixture of polyvinyl alcohol and polyquaternium salt, carboxymethyl cellulose, emulsifier of A-110 specification and ethanol aqueous solution, and the weight ratio is 8:0.7 :0.6:90. When making, first add the mixture of 8 parts of polyvinyl alcohol and polyquaternary ammonium salt to 40 parts of ethanol aqueous solution at 60-70 °C, stir to dissolve it completely, then add 50 parts of remaining ethanol aqueous solution, and adjust the temperature to 30-30 °C. 50°C; Add 0.7 parts of carboxymethyl cellulose and 0.6 parts of A-110 emulsifier to the above solution, stir and dissolve to form an integrated solution, and obtain a water-soluble carbon fiber sizing agent.

[0020] The weight fraction of the carbon fiber after sizing with this sizing agent is 1.9%; through the contact angle test, the contact angle between the carbon fiber and water after sizing is reduced by 21% compared with that before

[0021] Specific embodiment two: a kind of carbon fiber sizing agent, it is made by the mixture of polyvinylpyrrolidone and polyacrylic acid and polymaleic anhydride, the emulsifier of hydroxyethyl cellulose, A-110 specification and A-115 specification, aqueous ethanol system into, the weight ratio is 5:0.1:0.2:95. When making it, add 5 parts of polyvinylpyrrolidone, polyacrylic acid and polymaleic anhydride to 45 parts of ethanol aqueous solution at 70-80°C, stir to dissolve it completely, then add 50 parts of remaining ethanol aqueous solution to adjust temperature to 30-50°C; then add 0.1 part of hydroxyethyl cellulose and 0.2 parts of emulsifiers of A-110 and A-115 specifications to the above solution, stir and dissolve to form a unified solution, and obtain a water-soluble Permanent carbon fiber sizing agent.

[0022] The weight fraction of the carbon fiber after sizing with this sizing agent is 1.5%; through the contact angle test, the contact angle between the carbon fiber

[0023] Specific embodiment three: a kind of carbon fiber sizing agent, it is made of the mixture of polyvinylpyrrolidone and polyvinyl alcohol, the mixture of methyl cellulose and sodium polyacrylate, the emulsifier of A-105 specification and A-115 specification, deionized Made of water, the weight ratio is 7:0.1:0.2:90. When making it, first add the mixture of 7 parts of polyvinylpyrrolidone and polyvinyl alcohol to 90 parts of deionized water at 80-100 ° C, stir to dissolve it completely, and then add 0.1 parts of methyl cellulose and The mixture of sodium polyacrylate and 0.2 parts of emulsifiers of A-105 and A-115 specifications are added to the above solution, stirred and dissolved to form an integrated solution, and a water-soluble carbon fiber sizing agent is obtained.

[0024] The weight fraction of the carbon fiber after sizing with this sizing agent is 1.77%; through the contact angle test, the contact angle between the carbon fiber and water after sizing is reduced by