Mullite fiber surface modification method

Abstract

The invention relates to a mullite fiber surface modification method which comprises the following specific steps: 1, compounding a surface modifier; 2, performing surface modification, namely (1) hydrolyzing, (2) infiltrating and grafting, namely immersing the surface modifier from the fibers for infiltrating, enabling the hydroxyl groups of silanol or the hydroxyl groups and -Si-OH on the fiber surface to be subjected to etherification reaction so as to form a Si-O-Si structure, so that the structure is grafted to the fiber surface; then enabling active groups at the other end of a silane coupling agent to react with organic components in an impregnating compound, thereby obtaining the modified mullite fibers; and (3) drying and forming, namely infiltrating within 90 minutes, drying the taken mullite fibers in a drying box at the temperature of 105 DEG C to constant weight. According to the mullite fibers subjected to surface modification, silanol generated by hydrolyzing the silane coupling agent is enabled to act with the -OH on the fiber surface so as to form the Si-O-Si structure, the surface of the modified fiber sample contains coupling agent and film-forming agent components, the fibers are adhered to one another, the surface of the fiber sample is glossy, the softness is greatly improved, and the fiber surface properties are improved.

Description

【Technical field】 [0001] The invention relates to the technical field of modification of inorganic fiber materials, in particular to a method for surface modification of mullite fibers. 【Background technique】 [0002] Mullite fiber is composed of mullite microcrystals, which is a chemical composition of Al 4+2x Si 2-2x o 10-x (x ranges from 0.2 to 0.9) solid solution has smaller grain size and low activity, and has better stability in high-temperature oxidation environment than ordinary alumina-based fibers. Mullite fiber has excellent properties such as thermal stability, creep resistance, thermal shock resistance and low thermal expansion coefficient in high temperature oxidation environment. This kind of fiber material will be widely used in metallurgy, machinery, petrochemical, electronics, transportation And light industry and other industrial sectors, and it has been used in cutting-edge science and technology such as aerospace and atomic energy, and has become an i...

AI Technical Summary

Problems solved by technology

Changing the structure of the macromolecule will have a certain impact on the rigidity of its chain, but the modification effect is relatively durable, and the surface affinity of the fiber is greatly improved

[0008] Surface chemical treatment is a commonly used method to achieve the purpose of modification. Due to low surface energy and weak boundary layer, many fiber materials cannot adhere well to other substances, which results in dyeing and coating effects. very poor

Images