Preparation method for ultrahigh molecular weight polyethylene/biomass nanocrystal composite fibers

Abstract

The invention relates to a preparation method for ultrahigh molecular weight polyethylene / biomass nanocrystal composite fibers. According to the method, fibrous biomass nanocrystals and stearic acid whose end groups have undergone acyl chlorination are prepared at first, wherein, the fibrous biomass nanocrystals are cellulose nanocrystals or chitin nanocrystals, and the stearic acid whose end groups have undergone acyl chlorination is prepared by subjecting stearic acid to stirring-reflux in the solvent of thionyl chloride and removing the solvent through extraction; the fibrous biomass nanocrystals are dispersed in the solvent of dichloromethane through ultrasonic dispersion and added into the stearic acid whose end groups have undergone acyl chlorination, and stirring-reflux is carried out to obtain stearic acid surface grafted biomass nanocrystals; the obtained biomass nanocrystals are blended into a swollen spinning solution of an ultrahigh molecular weight polyethylene resin, gelfibers are obtained by subjecting an obtained mixture to spinning with a metering pump and a spinneret and to fixation in water bath, and the gel fibers are subjected to multistage hot-stretching after extraction and drying so as to obtain a finished product. The method provided in the invention enables mechanical properties of fibers to be improved and high-strength and high-modulus ultrahigh molecular weight polyethylene fibers to be obtained.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a method for preparing ultrahigh molecular weight polyethylene / biomass nanocrystal composite fibers. technical background [0002] Ultra-high molecular weight polyethylene fiber is a high-strength and high-modulus fiber that was successfully developed in the late 1970s and industrialized in the early 1980s. Ultra-high molecular weight polyethylene fiber, carbon fiber and aramid fiber are called the three high-performance fibers. Due to the ultra-high molecular weight polyethylene fiber has multiple excellent properties such as ultra-light, high specific strength, high specific modulus, superior energy absorption, good wear resistance, corrosion resistance, and light resistance, it has been used in aerospace, national defense, military, security, etc. It has been widely used in protection, marine engineering, sports equipment, power communication, medical materials and ci...

AI Technical Summary

Problems solved by technology

However, the modulus of ultra-high molecular weight polyethylene fiber is not high enough, which seriously limits its application in a wider range, especially in the field of composite materials with great demand (including the preparation of high-performance composite materials by mixing ultra-high molecular weight polyethylene fiber and carbon fiber. Wait)