Method for preparing para-aramid dissolving pulp and products

Abstract

A preparation method of a para-aramid pulp comprises the following steps: (1) para-aramid filaments are cut into 3-13mm short fibers by a mechanical cutter, and then the short fibers are dispersed into water to prepare 0.1%-5% suspension; (2) the suspension is disintegrated and cut off by a disc refiner, and fibrillated for 10-30min to prepare a sufficient micro-fibrillated pulp with the single fiber length of 0.8-3mm and the specific surface area of 5-10m<2> / g; (3) the pulp is dehydrated and dried by a paper machine to make paper; and (4) the paper is cut into pieces by a shredder, then loosened by a fiber opener to prepare the para-aramid pulp, and finally the obtained pulp is compressed and packaged. In the para-aramid pulp prepared by the method, average length of the pulp fiber is 0.8-3mm, and the specific surface area thereof is 5-10m<2> / g. The preparation method has the advantages of simple and stable process. The adopted devices are mostly paper making equipment without new equipment investment, therefore, the cost is well controlled.

Description

technical field [0001] The invention relates to the preparation and product of a novel fiber, in particular to a preparation method and product of para-aramid pulp. Background technique [0002] Para-aramid pulp (PPTA-pulp) is a highly dispersed fibrillated para-aramid product first developed by DuPont in the early 1980s. The chemical structure of para-aramid pulp is the same as that of para-aramid fiber, and it retains most of the excellent properties of aramid fiber, such as heat resistance, wear resistance, and stable size, but it also has rich hairiness, high aspect ratio, Large specific surface area (up to 7-9m 2 / g) and other advantages, it can be better dispersed in the matrix to make an isotropic composite material with excellent performance, because of its good heat resistance, corrosion resistance, good dispersion and mechanical properties, it can be used in friction sealing composite materials (instead of asbestos) has been better applied. The application of pu...

AI Technical Summary

Problems solved by technology

[0003] However, the preparation of para-aramid pulp is difficult and costly

Most of its preparation methods have complex processes, it is difficult to realize continuous industrial production, or the inherent viscosity of the product is different due to unstable processes.