Preparation method of modified carbon fiber thermal insulation composite material

Abstract

The invention discloses a preparation method of a modified carbon fiber thermal insulation composite material. The modified carbon fiber thermal insulation composite material is prepared from raw materials of silicon powder, coconut shell, phenol, polyvinyl alcohol, etc. The preparation method is characterized in that the coconut shell is used to prepare porous carbon fiber and undergoes a plurality of modification processes to obtain porous carbon fiber with high mechanical strength and high adsorption; and then the porous carbon fiber is impregnated with alkaline silica sol, so that the well-developed mesoporous structure of the silica sol makes the carbon fiber have high temperature resistance and extremely low thermal conductivity, and further strengthens the thermal insulation capacity of the carbon fiber. The obtained composite material is not only light in weight, but also has high thermal insulation ability and low thermal conductivity, so that use cost of the thermal insulation material is greatly reduced, and the modified carbon fiber thermal insulation composite material is suitable for the needs of thermal insulation materials in various fields.

Description

technical field [0001] The invention relates to the technical field of heat insulation materials, in particular to a preparation method of a modified carbon fiber heat insulation composite material. Background technique [0002] With the development of science and technology, the demand for thermal insulation materials in various fields of national economy such as military, national defense, metallurgy, and chemical industry is increasing day by day, and the performance requirements for thermal insulation materials are getting higher and higher. my country has at least 100,000 high-temperature furnaces such as cemented carbide sintering furnaces, monocrystalline silicon furnaces, polycrystalline ingot furnaces, vacuum smelting furnaces, vacuum heat treatment furnaces, and vapor deposition furnaces. A large part of these high-temperature furnaces are still common Traditional thermal insulation materials are heavy, have high thermal conductivity, and part of the molding process...

AI Technical Summary

Problems solved by technology

[0005] At the same time, because the carbon fiber preparation process includes carbonization or graphitization, the carbon atom stacking orientation on the carbon fiber surface is more consistent, and the atomic layer spacing is smaller, so the fiber surface is non-polar and chemically inert. In addition, the carbon fiber surface has hydrophobic, Shortcomings such as smoothness and low adsorption performance lead to poor interfacial bonding between carbon fiber and its composite material