A low surface tension carbon fiber composite emulsion sizing agent and preparation method thereof

Abstract

The invention discloses a carbon fiber composite emulsion sizing agent with low surface tension and a preparation method thereof. The main agent of the sizing agent includes 20% to 60% of aliphatic polyester polyol and 20% to 60% of bisphenol A epoxy resin , 10-20% anionic surfactant, 0.5-5% antioxidant, 0.5-5% leveling agent, the preparation process includes resin mixing, adding additives, adding deionized water and other steps. The solid content of the sizing agent emulsion prepared by the invention is 30-60%, the pH of the emulsion is 6.0-8.0, the average particle diameter of the emulsion is 100-300nm, and the surface tension of the emulsion is less than 35mN / m. The prepared sizing agent has strong ability of wetting and absorbing carbon fiber, and has good online sizing effect.

Description

technical field [0001] The invention belongs to the field of carbon fiber chemical industry, and in particular relates to a carbon fiber composite emulsion sizing agent with low surface tension and a preparation method thereof. Background technique [0002] Carbon fiber has high specific strength, high specific modulus, high temperature resistance, corrosion resistance and excellent thermal conductivity, electrical conductivity, radiation resistance and other comprehensive properties. The fiber-reinforced resin-based composite materials prepared by it are widely used in aerospace, aviation, construction, industry and other fields . However, carbon fiber is a brittle material, and various mechanical frictions in the process can easily cause hair and breakage of carbon fiber, so that the resin matrix cannot be fully infiltrated. At the same time, the surface of carbon fiber is chemically inert, and the adhesion between it and the resin matrix is ​​poor, which easily reduces t...

AI Technical Summary

Problems solved by technology

Patents CN201210184017.8 and CN201210413441.5 report sizing agent components and preparation methods mainly composed of polyarylether resin and polyetherimide resin. The prepared sizing agent is mainly suitable for polyarylether base, polyetherimide Amine-based composite material system; due to the presence of a certain amount of organic solvents in the process of preparation and use, there are potential safety hazards in the expansion of engineering applications

[0005] At present, the carbon fiber sizing agents that have been developed are mainly aimed at the epoxy resin matrix, and some sizing agents are also applied to other types of resins to a certain extent, but most of them are limited to a certain type of resin, which limits the application field of carbon fiber

The carbon fiber produced can only be applied to a single type of resin matrix, and it is difficult to apply to other types or composite resin matrix at the same time

At the same time, the carbon fiber production process is more complicated, and the type of sizing agent and sizing process must be frequently changed for different purposes

Carbon fiber sizing agents that can take into account the application performance of epoxy resin and polyester resin and have excellent processability have not been reported yet

Images