Preparing method of phenolic fibers

Abstract

The invention discloses a preparing method of phenolic fibers. The method comprises the steps that phenolic resin and a spinning improver are evenly mixed, a mixed material is subjected to melt blending through a dual-screw extruder to form a melt, the melt enters a single-screw extruder, the fibers are sprayed out through a fiber spraying assembly, the fibers are sucked through a fiber sucking device, the fibers are conveyed to a fiber collecting device by a fiber conveying pipe, and phenolic fiber protofilaments are obtained; and the prepared phenolic fiber protofilaments are subjected to apre-crosslinking reaction in a solidifying solution composed of formaldehyde, hydrochloric acid and deionized water, a ladder type heating manner is adopted for carrying out a second-time crosslinkingreaction, and finally, at the high temperature, third-time crosslinking treatment is carried out. The spinning efficiency of the phenolic fiber protofilaments can be effectively improved, the phenolic fiber crosslinking reaction time can be shortened, and the phenolic fibers which are excellent in mechanical property, and high in char yield can be prepared.

Description

technical field [0001] The invention belongs to the field of melt spinning, and in particular relates to a preparation method of phenolic fiber. Background technique [0002] Phenolic fiber is a highly cross-linked organic fiber prepared from thermoplastic phenolic resin or thermosetting phenolic resin, which can withstand 2500 o C high temperature, long-term use temperature 150-180 o C, good thermal insulation. In 1968, the American Emery Company successfully developed phenolic fiber for the development of flame-resistant and fire-resistant materials for aerospace. Because phenolic fiber has excellent flame retardancy and flame resistance, it can be used to make heat insulation and insulation materials for rocket nozzles, airplanes, trains, ships, and automobiles. In addition, phenolic fiber pure spinning or blended with other fibers can also be widely used as heat-resistant clothing, racing clothing, high-temperature furnace work clothing, fire-fighting clothing, acid-r...

AI Technical Summary

Problems solved by technology

Aiming at the existing problems such as complicated preparation process of spinnable phenolic resin, low efficiency of phenolic resin melt-spinning process, long curing and cross-linking time, and difficulty in industrialization, this patent uses general-purpose phenolic resin as raw material without increasing the process steps. Next, through the preparation of raw silk and the design of post-processing technology, the spinnability of phenolic resin can be improved, the problems of high brittleness and easy broken filaments can be overcome, the spinning speed can be increased, the post-processing time can be reduced, and the production efficiency of phenolic fiber can be greatly improved, which is suitable for industrial production

Images