Para-aramid paper and preparation method thereof

Abstract

The invention discloses Para-aramid paper and a preparation method thereof. By adding Para-aramid pulp size, sieved and selected from pulp fiber, of 50-100 meshes to form mixed size, fiber length and width distribution span of aramid pulp fiber is reduced, and obtained pulp fiber is concentrated in length distribution and width distribution, and have larger specific surface area. When the obtained pulp fiber is used with chopped fiber for papermaking with pulp, the obtained pulp fiber can be served as filler to combine with the chopped fiber better, paper sheet gap is filled, combination of fiber after hot pressing is tighter, combination of fiber is enhanced, paper sheet gap is reduced, evenness of finished paper is increased evidently, mechanical strength and compression strength of aramid paper are improved, paper breaking during papermaking is reduced, speed of a paper machine is increased, production efficiency is improved, and adverse effects to paper sheet performance due to introduction of a third binding fiber is avoided.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a para-aramid paper, and also relates to a preparation method of the para-aramid paper. Background technique [0002] Para-aramid fiber (poly-p-phenylene terephthalamide) has excellent properties such as high specific strength, high specific modulus, high temperature resistance and flame retardancy, and has low relative density, fatigue resistance, shear resistance and size Good stability and other advantages, it is a typical representative of high-performance fibers. Para-aramid paper is prepared from para-aramid chopped strands and pulp fibers in a certain ratio through a wet papermaking process. The main process is: 1. Dispersing raw materials to obtain slurry; 2. Slurry forming on the net; 3. Dehydration, pressing, drying; 4. High temperature calendering treatment and forming. [0003] Due to its strong mechanical properties, excellent dielectric properties,...

AI Technical Summary

Problems solved by technology

[0005] The flocculation of aramid fiber in water medium is very severe and not easy to disperse, which will have a negative impact on the formation of paper and the performance of the paper; and the para-aramid paper is also due to the rigid structure of the molecular chain of the aramid fiber and the chemical inertness of the fiber surface. , the lack of effective combination between fibers cannot fully reflect the characteristics of high strength and high modulus of the fiber itself

The method described in the above-mentioned patent is to add a third kind of bonding fiber with obvious melting temperature and para-aramid fiber to prepare and then heat-press the method to achieve the reinforcing effect. The negative impact is due to the fact that the bonding fiber Thermal shrinkage under hot-pressing conditions causes gaps and pinholes to be formed at the position of the original bonding fibers in the paper due to heat shrinkage, increasing the porosity of the paper, which will affect the bonding performance between the aramid fibers and the aramid paper. Insulation strength, at the same time, due to the different properties of the binder fibers, it will affect the temperature resistance of the paper

The use of ultrasonic treatment will reduce the breaking strength and breaking strength of the aramid fiber itself, which will affect the performance of the paper.

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