A kind of preparation method of phenolic resin/modified or unmodified polyvinyl alcohol composite fiber adhesive

Abstract

The invention relates to a method for preparing a phenolic resin / modified or unmodified polyvinyl alcohol composite fiber adhesive. The phenolic resin and modified or unmodified polyvinyl alcohol are added to a solvent to configure a viscosity of 100Pa·s~ 2000Pa·s spinning stock solution, using dry spinning process to prepare composite fiber adhesive; modified polyvinyl alcohol is more than one of polyvinyl formal and polyvinyl butyral; composite fiber adhesive In the agent, the phenolic resin is uniformly dispersed in the form of islands in the modified or unmodified polyvinyl alcohol, and the size of the dispersed phase is <2 μm; a kind of phenolic resin / modified or unmodified polyvinyl alcohol composite of the present invention The preparation method of the fiber binder has a simple process and can be applied to prefabricated bodies for carbon / carbon composite materials and carbon paper for fuel cells. The composition, fineness, chopped length and dosage are used to control the conductivity and strength of the prefabricated body and carbon paper.

Description

A kind of phenolic resin / modified or unmodified polyvinyl alcohol composite fiber binder manufacturing method technical field The invention belongs to carbon / carbon composite material technical field, relate to a kind of phenolic resin / modified or unmodified polyvinyl alcohol The preparation method of the composite fiber adhesive, specifically relates to a kind of phenolic resin / modified or unmodified preform prepared by dry spinning A method of modifying a polyvinyl alcohol composite fiber binder. Background technique [0002] The carbon / carbon composite material has excellent properties such as low density, good thermal conductivity, high electrical conductivity, corrosion resistance and thermal shock resistance, It is widely used in the aerospace field, and gradually expanded to new energy, civil, medical and other fields, becoming an indispensable part of modern technology. Alternative materials. [0003] Preforms for carbon / carbon composites are generally prepar...

AI Technical Summary

Problems solved by technology

However, powder adhesives usually have problems of uneven distribution, resulting in poor material performance; liquid adhesives usually have problems such as uncontrollable adhesion and large pollution.

Chinese patent CN111900418A provides a method for preparing a carbon fiber paper prefabricated body for a gas diffusion layer of a fuel cell. Although adding a small amount of nanocellulose can significantly improve the dispersion of carbon fibers, the binder resin is immersed in the vacuum negative pressure suction process. Carbon paper still cannot solve the problems of uneven distribution of resin inside carbon paper and difficulty in controlling the amount of adhesion caused by its own fluidity and gravity, which will eventually lead to poor overall uniformity of carbon paper

U.S. Patent US4818448 uses uncured granular phenolic resin as a binder, disperses carbon fibers and binders in water, prepares prefabricated bodies through simple pressure filtration technology, and then prepares carbon / carbon composite materials through carbonization, but due to A large amount of granular phenolic resin is not easy to disperse evenly, resulting in uneven distribution of the final properties of the material

Chinese patent CN101047253A provides a carbon fiber paper bonded with acrylic fibers. The acrylic fibers are introduced into the carbon fiber laminations through a conventional wet papermaking process, and then solidified and carbonized to prepare carbon fiber paper. The mixture is evenly distributed, but due to the low residual carbon rate of acrylic fibers, the bond strength between carbon fibers after carbonization is weak