A kind of preparation method of phenolic fiber

Abstract

A preparation method of phenolic fiber, comprising the steps of uniformly mixing phenolic resin and spinning improver, the mixed materials are melted and blended by a twin-screw extruder to form a melt, and then the melt enters a single-screw extruder, The fiber is sprayed out through the spinneret assembly, sucked through the aspirator, and transported to the fiber collection device by the wire feeding pipeline to obtain the phenolic fiber precursor; the prepared phenolic fiber precursor is cured in formaldehyde, hydrochloric acid, and deionized water. The pre-crosslinking reaction is carried out first in the solution, and then the second crosslinking reaction is carried out by adopting a stepwise heating method, and finally the third crosslinking treatment is carried out at high temperature. This patent effectively improves the spinning efficiency of the phenolic fiber precursor, shortens the crosslinking reaction time of the phenolic fiber, and prepares the phenolic fiber with excellent mechanical properties and high char formation rate.

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