| 摘要 |
PURPOSE:To obtain the title molded item having excellent high temp. alkali resistance, high strength and elastic modulus, high heat resistance and being usable for reinforcing high-temp. curing cement, by binding sulfur in a small amt. below a specified value therewith. CONSTITUTION:The title molded item whose content of bound sulfur is 5wt.% or lower is obtd. by treating an arom. polyamide molded item in the vapor of a sulfur compd. such as SO2 gas at 250 deg.C or higher and thereby introducing sulfur into the arom. polyamide molded item. As the above-described molded items, not only simple fibers, but cut fibers, pulps, woven fabrics, felts, papers, films, boards, resinous materials, etc., are included without any limitation in their shapes and molded items thereof and composites wherein these serve as base materials are also included. These molded items have remarkably excellent high temp. alkali resistance as well as high strength, elastic modulus, and heat resistance. They can be used in the field for reinforcing high-temp. (180 deg.C) (autoclave) curing type of cement which has not been usable heretofore. Furthermore, these molded items can be used not only for reinforcing cement, but also in such industrial applications as asbestos substituting fibers based on their heat resistance and high strength. |
