Method for preparing para aramid paper from para aramid fibrid

A technology of para-aramid paper and para-aramid fiber, applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material treatment, fiber dispersant addition, etc., can solve the problem of limited wide application and weak dimensional stability , low elasticity and other problems, to achieve high surface activity, improve green water performance, and high specific surface area

Active Publication Date: 2014-02-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the products prepared by these methods have disadvantages such as poor uniformity, low elasticity, and weak dimensional stability. It is difficult to meet the complex conditions of high precision, light weight, high density, and high humidity. Wide application in high-end fields of transportation and aerospace

Method used

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  • Method for preparing para aramid paper from para aramid fibrid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The para-aramid precipitated fiber was pretreated for 10 minutes with an ultrasonic processor at a power of 200W and an intermittent time of 5s, and then beating was performed with a trough beater, and the degree of beating was controlled at 35°SR; the aramid chopped fiber was The mass-molar concentration used is 1.5×10 -3 mol / L, the temperature is 40 ℃ sodium dodecylbenzene sulfonate aqueous solution for washing pretreatment, and then washed with water, and then treated with low temperature plasma for 1min under the conditions of pressure 30Pa, power 60W; Add the treated para-aramid chopped fiber and 0.1% dispersant PEO to the beater, fully decompose, then add para-aramid precipitated fiber according to the ratio of 3:7, add APAM, fully decompose and disperse, and obtain Aramid fiber slurry; the prepared slurry is formed on an inclined wire paper machine, pressed and dried; the obtained aramid base paper is preheated and pressed at 100°C for 10s, and further hot-presse...

Embodiment 2

[0039] The para-aramid precipitated fiber was pretreated for 15 minutes with an ultrasonic processor at a power of 800W and an intermittent time of 7s, and then beating was performed with a trough beater, and the degree of beating was controlled at 40°SR; the aramid chopped fiber was Utilize a mass-molar concentration of 2.0×10 -3 mol / L, the temperature is 60 ℃ sodium dodecylbenzene sulfonate aqueous solution for washing pretreatment, and then washed with water, and then treated with low temperature plasma for 2min under the conditions of pressure 50Pa, power 70W; Add the treated para-aramid chopped fiber and 0.3% dispersant PEO to the beater, fully decompose, then add para-aramid precipitated fiber according to the ratio of 5:5, add APAM, fully decompose and disperse, and obtain Aramid fiber slurry; the prepared slurry is formed on an inclined wire paper machine, pressed and dried; the obtained aramid base paper is preheated and pressed at 120°C for 20s, and further hot press...

Embodiment 3

[0041] The para-aramid precipitated fiber was pretreated for 20 minutes with an ultrasonic processor at a power of 1500W and an intermittent time of 8s, and then was beaten with a trough beater, and the beating degree was controlled at 45°SR; the aramid chopped fiber was used The mass-molar concentration is 2.5×10 -3 mol / L, the temperature is 70 ℃ sodium dodecylbenzene sulfonate aqueous solution for washing pretreatment, and then washed with water, and then treated with low temperature plasma for 3min under the conditions of pressure 70Pa, power 80W; Add the treated para-aramid chopped fiber and 0.7% dispersant PEO to the beater, fully decompose, then add para-aramid precipitated fiber according to the ratio of 7:3, add APAM, fully decompose and disperse, and obtain Aramid fiber slurry; the prepared slurry is formed on an inclined wire paper machine, pressed and dried; the obtained aramid base paper is preheated and pressed at 150°C for 30s, and further hot pressed on a hot pr...

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Abstract

The invention discloses a method for preparing para aramid paper from para aramid fibrid. The method concretely comprises the steps of carrying out surface treatment, defibering and dispersion on para aramid chopped fibers; carrying out ultrasonic treatment and pulping treatment on the para aramid fibrid; mixing the treated para aramid chopped fibers and the treated para aramid fibrid; adding anionic polyacrylamide into the mixed fibers to obtain aramid fiber pulp; shaping the aramid fiber pulp on an inclined wire paper machine; dehydrating, squeezing and drying; carrying out pre-hot-pressing on the dried aramid base paper, and then carrying out hot pressing by a hot press to obtain the para aramid paper. After the method for preparing the para aramid paper from the para aramid fibrid is adopted, the tensile strength, the tearing strength, the breaking strength, the wear resistance and the dielectricity of the para aramid paper are remarkably improved, and the para aramid paper can be taken as a structural material, an insulating material or an electronic material and is relatively widely applied to the fields of transportation, electronics and electric power, aerospace and the like.

Description

technical field [0001] The invention belongs to the technical field of manufacturing special fiber synthetic aramid paper, and in particular relates to a method for preparing para-aramid paper with para-aramid precipitated fibers. 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 corrosion resistance, and has fatigue resistance, shear resistance, small relative density and size Good stability and other advantages, is a typical representative of high-performance synthetic fibers. The current products are mainly para-aramid chopped fiber, para-aramid pulp fiber and para-aramid precipitated fiber. With the development of modern paper industry, para-aramid fiber has become an important paper-making raw material . [0003] Para-aramid paper is prepared from para-aramid chopped strands and precipitated fibers (or pulp fibers) in a certa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26D21H21/08
Inventor 张美云江明陆赵情
Owner SHAANXI UNIV OF SCI & TECH
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