Method for preparing para-aramid dissolving pulp and products

A technology of para-aramid pulp and para-aramid, which is applied in chemical instruments and methods, textiles and papermaking, single-component polyamide artificial filaments, etc., and can solve the problems of high cost, different product intrinsic viscosity, para-aramid Aramid pulp is difficult to prepare and achieve excellent high temperature resistance and good fiber shape

Inactive Publication Date: 2009-06-17
YANTAI TAYHO ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of para-aramid pulp, comprising the following steps:

[0020] (1) para-aramid filaments are cut into short fibers of 3mm through a mechanical cutter, and then dispersed in water to form a 5% suspension;

[0021] (2) The suspension is decomposed, cut, and broomed for 10-30 minutes by a disc mill to make a single fiber with a length of 0.8-3mm and a specific surface area of ​​5-10m 2 / g of fully microfibrillated slurry;

[0022] (3) The slurry is dehydrated and dried into paper by a paper machine;

[0023] (4) The paper is shredded by a paper shredder, then loosened by an opener to make para-aramid pulp, and finally compressed and packaged.

[0024] According to the para-aramid pulp prepared by this method, the average length of the pulp fiber is 0.8-3mm, and the specific surface area is 5-10m 2 / g.

Embodiment 2

[0026] A preparation method of para-aramid pulp, comprising the following steps:

[0027] (1) para-aramid filaments are cut into short fibers of 8mm through a mechanical cutter, and then dispersed in water to form a 2.5% suspension;

[0028] (2) The suspension is decomposed, cut, and broomed for 10-30 minutes by a disc mill to make a single fiber with a length of 0.8-3mm and a specific surface area of ​​5-10m 2 / g of fully microfibrillated slurry;

[0029] (3) The slurry is dehydrated and dried into paper by a paper machine;

[0030] (4) The paper is shredded by a paper shredder, then loosened by an opener to make para-aramid pulp, and finally compressed and packaged.

[0031] According to the para-aramid pulp prepared by this method, the average length of the pulp fiber is 0.8-3mm, and the specific surface area is 5-10m 2 / g.

Embodiment 3

[0033] A preparation method of para-aramid pulp, comprising the following steps:

[0034] (1) Para-aramid filaments are cut into short fibers of 13mm through a mechanical cutter, and then dispersed in water to form a 0.1% suspension;

[0035] (2) The suspension is disintegrated, cut, and broomed for 10 to 30 minutes by a disc refiner to make a fully microfibrillated slurry with a single fiber length of 0.8 to 3 mm and a specific surface area of ​​5 to 10 m2 / g;

[0036] (3) The slurry is dehydrated and dried into paper by a paper machine;

[0037] (4) The paper is shredded by a paper shredder, then loosened by an opener to make para-aramid pulp, and finally compressed and packaged. According to the para-aramid pulp prepared by this method, the average length of the pulp fiber is 0.8-3mm, and the specific surface area is 5-10m 2 / g.

[0038] Unless otherwise specified, the % involved in the present invention refers to the percentage by weight.

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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...

Claims

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Application Information

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IPC IPC(8): D01D1/00D01F6/60C09K3/10C08J5/14C08L77/10
Inventor 陈文建孙茂健王鹏
Owner YANTAI TAYHO ADVANCED MATERIALS CO LTD
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