Meta aramid fibre paper and prepn. process

Abstract

A method for preparing meta- PPTA paper includes forming a sizing material by adding 5-95 wt. % of meta- PPTA staple fiber into water and forming another sizing material by adding 5-95 wt. % of meta- PPTA precipitated fiber in water, mixing two said sizing materials, laying prepared sizing material on screen for forming, pressing and drying, pressing and polishing in high temperature for forming.

Description

1. Technical field [0001] The invention relates to a meta-aramid paper and a preparation method, belonging to the technical field of synthetic fiber paper manufacture. 2. Background technology [0002] 1. Application number: 200410026569.1 Invention patent application provides a preparation method of aramid amide paper, including the following steps: adding 20-90% of aramid short fiber or polyparaphenylene benzobisoxazole fiber to water, 0-40% aramid fibrillated fiber or poly-p-phenylene benzobisoxazole fibrillated fiber, 1-80% aramid pulp and dispersing aid, and the raw materials are dispersed to obtain slurry; the slurry is formed on the Internet ; Dehydration, pressing, drying; Hot pressing; The proportions of the above-mentioned components are percentages by weight. This invention can effectively solve the key technical problems in the aramid paper manufacturing process, make the process more reasonable, and can effectively improve the evenness of the aramid paper and t...

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned relevant prior art patents basically use para-aramid fiber as the raw material for the preparation of aramid paper. The aramid paper product of this raw material has better dimensional stability and insulation under high temperature and high humidity conditions, but due to The elongation at break of para-aramid fiber is only about 2.5%, and the degree of symmetry orientation and crystallinity of para-aramid fiber is higher than that of meta-aramid fiber. The mechanical properties of the aramid paper prepared by the above methods are poor, and it is difficult to be applied to a wider range of insulating materials; in addition, there is an obvious problem in the raw material preparation process of the aramid paper prepared by the prior art, that is, the aramid fiber in water Dispersion problem, because the molecule of aramid amide is a rigid structure, and the surface of para-aramid fiber shows greater chemical inertness, so it is difficult to disperse in water, and to make high-strength aramid paper, aramid staple fiber must have enough length, which makes aramid fibers easy to flocculate in water, resulting in poor paper evenness, affecting paper quality, and bringing certain difficulties to paper machine making

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