A kind of emulsion sizing agent for carbon fiber with low contact angle and low moisture regain and its preparation and application

Abstract

An emulsion sizing agent used for carbon fibers with a small contact angle and a low moisture regain is disclosed. The emulsion sizing agent comprises main agents and deionized water. The mass ratio of the main agents to the deionized water is (35:65)-(55:45). The main agents comprise 10-30 wt% of aromatic polyester polyol, 60-80 wt% of bisphenol A epoxy resin, 6-10 wt% of an anionic surfactant, 0.5-1.5 wt% of an antioxidant and 0.5-1.5 wt% of a leveling agent. The carbon fibers sized by utilizing the emulsion sizing agent are small in contact angles with substrate resin, high in infiltration speed, high in adsorbability, high in interface bonding strength with composite materials, extremely low in moisture regain, low in requirements on carbon fiber storage environments, capable of being stored for long time without influences on physical performance of the fibers and high in resistance to heat and humidity, and can be applied in a plurality of complex environment conditions, such as aviation and offshore operation. A preparing method and a using method of the emulsion sizing agent used for the carbon fibers are also disclosed.

Description

technical field [0001] The invention belongs to the field of carbon fiber chemical industry, and in particular relates to a low contact angle and low moisture regain carbon fiber emulsion sizing agent and its preparation and application. Background technique [0002] Carbon fiber composites are not only indispensable new materials for aerospace and military industries, but also have outstanding social and economic benefits in civil industries such as transportation, infrastructure, new energy and environmental governance. In the forming process of carbon fiber composite materials, various technical performance indicators of carbon fiber have an important impact on the physical comprehensive performance and stability of composite materials, which determine the practicability and economical efficiency of composite materials. [0003] The contact angle between carbon fiber and matrix resin is an important factor affecting the ease of preparation of composite materials and the s...

AI Technical Summary

Problems solved by technology

This type of sizing agent does not pay enough attention to the contact angle between carbon fiber and matrix resin, and because it is prepared by external emulsification method, there are too many components such as surfactant and curing agent in the formula, and the moisture regain of carbon fiber is relatively high.

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