Heat resistance of basalt fiber enhanced by silicious-fluoric-PAA hybrid sizing agent

Abstract

Basalt fiber, as a high strength and good temperature resistance inorganic material, has an excellent application in the high temperature filtration industry, but its strength retention decreases obviously with time going when baked at temperature above 300°C. This limits the range of its application as a filter material. In this paper, the sizing agent was prepared by mixing polytetrafluoroethylene, silane coupling agent, polyacrylate acid, polysilicic acid and polyurethane crosslinking agent in aqueous solution together, and then the surface of basalt fiber was coated by the sizing agent. The experiment results showed that the emulsion droplets formed in the aqueous solution had small particle size and good dispersibility. The initial decomposition temperature of the film formed by the sizing agent was 220°C. The initial tensile strength of the coated basalt fiber was 60% higher than that of the uncoated fiber at room temperature. The residual strength of the coated fiber was 6 times higher than that of the uncoated fiber when treated at 340°C for 10 hours.