A method for preparing high ortho thermosetting phenolic fiber by wet spinning

Abstract

The invention discloses a method for preparing high-ortho thermosetting phenol-formaldehyde fibers by wet spinning. Phenol compounds and aldehyde compounds undergo a reaction under the action of a catalyst, and high-ortho thermoplastic phenol-formaldehyde resin is formed; the obtained thermoplastic phenol-formaldehyde resin is dissolved in absolute ethyl alcohol, undergoes a reaction with aldehydes under the action of a basic catalyst and is neutralized with an acid to obtain the high-ortho thermosetting phenol-formaldehyde resin; the high-ortho thermosetting phenol-formaldehyde resin is mixedand stirred evenly with absolute ethyl alcohol, polyvinyl butyral and the like, the mixture is subjected to wet spinning, and primary fibers are thermocured to obtain the phenol-formaldehyde fibers prepared by the wet spinning. The method can obtain the phenol-formaldehyde fibers with good mechanical properties and high limit oxygen index without solution curing, reduces the manufacturing steps,reduces pollution and saves energy.

Description

technical field [0001] The invention belongs to the field of preparation of flame-retardant and temperature-resistant special fibers, and in particular relates to a method for preparing high-ortho-position thermosetting phenolic fibers by wet spinning. Background technique [0002] Phenolic fiber has low thermal conductivity and high limiting oxygen index, and has less smoke during combustion, is non-toxic, has no melting dripping phenomenon, and has instant high temperature resistance, because it can withstand flame temperature or even higher temperature. It will be carbonized, decomposed, and carbon dioxide and water will be released to take away heat. It is a good flame-retardant and heat-insulating material. [0003] Although the preparation of phenolic fibers is suitable for the melt-spinning process, this method has been recognized and industrialized. However, due to the low molecular weight of the precursor phenolic resin, the nascent fiber is extremely brittle, and ...

AI Technical Summary

Problems solved by technology

[0004] In view of the serious pollution in the solidification process of melt spinning and the difficulty of large-scale production of electrospinning in the prior art, the present invention proposes a method for preparing heat-resistant and flame-retardant high-ortho-position phenolic fibers through wet spinning technology. method, that is, phenols and aldehyde compounds react under the action of a catalyst, and the generated high-ortho thermoplastic phenolic resin continues to react with aldehyde compounds to generate a high-ortho thermosetting phenolic resin; the obtained high-ortho thermosetting Phenolic resin, anhydrous ethanol, polyvinyl butyral prepared spinning stock solution, wet spinning, and then curing treatment, to obtain flame-retardant, heat-resistant phenolic fiber prepared by wet spinning