Abstract: The effect of a single component sizing agent and three kinds of composite sizing agent in different content on carbon fiber surface properties was investigated. The results indicate that the width, hardness, friction coefficient, fuss weight, splitting rate of carbon fiber, and the morphology of the composite interface varied with the content and type of sizing agent, the correlated variable law between surface properties of carbon fiber and the type and content of the sizing agent was disclosed. By combining with TOARYT700SC-12K test result,reference values that are suitable for the industrial production was offered, i.e., the sizing agent content general is 1.0±0.3% in industrial production, carbon fiber T300/700-12K surface properties general is: width is 7±1 mm, hardness is 10±2 cm, the friction coefficient is 0.16±0.05, splitting rate is 2.0±0.3, fuzz weight is less than 3 mg. Furthermore, it suggested that the multi-component composite sizing agent is better than the single component sizing agent in obtaining carbon fiber with controllable surface properties, which provides reference for the controllable method of carbon fiber surface properties.

Key words: carbon fiber, sizing agent, surface properti