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Composite fibre for substituting asbestos

A composite and fiber technology, applied in fiber type, fiber treatment, short fiber formation, etc., can solve the complex spinning process of sea-island structure fibers, the degree of fibrillation is difficult to meet the needs of fine particles, and the fibers are difficult to disperse evenly and other problems, to achieve the effect of avoiding easy entanglement, high cost performance, and inhibiting the loss of components

Inactive Publication Date: 2007-10-24
SHANGHAI LABON TECHNICAL FIBER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, reinforcing fibers and auxiliary fibers are sequentially added to the forming system, and it is difficult for the fibers to be evenly dispersed in the cement matrix
[0006] JP10007811 and JP9241063 disclose sea-island structure fibers obtained by blending and spinning polyvinyl alcohol and polyacrylonitrile polymers to reinforce rubber products and cement concrete products. However, the spinning process of the sea-island structure fiber is complicated, and only by means of the shearing action in the forming process to make the fiber show its original shape. Fibrillation, which is not sufficiently fibrillated to capture fine particles in composite formulations

Method used

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  • Composite fibre for substituting asbestos
  • Composite fibre for substituting asbestos

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Weigh 50 kg of polyacrylonitrile chopped fibers with a length of 5 mm and a denier of 3 d and 50 kg of polyacrylonitrile pulp with a length distribution of 2.0 ± 0.4 mm and a Canadian standard freeness of 225 ± 25 ml, and mix and disperse them in 4 t of water to form a suspension. Use 34s -1 After the suspension is forcedly dispersed and mixed at a high shear rate, it is centrifuged and dried to obtain a composite fiber A in which polyacrylonitrile pulp fibers are evenly coated on the surface of polyacrylonitrile chopped fibers.

example 2

[0023] Weigh 50kg of polyacrylonitrile chopped fibers with a length of 4mm and a denier of 1.5d and 50kg of polyacrylonitrile pulp with a length distribution of 2.0±0.4mm and a Canadian standard freeness of 225±25ml, mix and disperse them in 4t of water to form a suspension , using 34s -1 After forced dispersion and mixing of the suspension at a high shear rate, centrifugal dehydration and drying are performed to obtain a composite fiber B in which polyacrylonitrile pulp-like fibers are uniformly coated on the surface of polyacrylonitrile chopped fibers.

example 3

[0025] Weigh 75kg of polyvinyl alcohol polyacrylonitrile chopped fibers with a length of 6mm and a denier of 1.5d and 25kg of polyacrylonitrile pulp with a length distribution of 2.0±0.4mm and a Canadian standard freeness of 225±25ml, mix and disperse them in 4t of water To form a suspension, take 34s -1 After the suspension is forcedly dispersed and mixed at a high shear rate, it is centrifugally dehydrated and dried to obtain a composite fiber C in which polyacrylonitrile pulp fibers are uniformly coated on the surface of polyvinyl alcohol chopped fibers.

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Abstract

The present invention discloses a composite fiber which can replace asbestos. It includes enhanced short fiber and adjuvant producing pulp fiber, among the both, the pulp fiber covers the face of short fiber uniformly. Said enhanced short fiber contains at least one of the following fibers: polyacrylonitrile fiber, polyvinyl alcohol fibers, aromatic amide fiber, polyamide fiber, polyolefin fiber, glass fiber and so on; said pulp fiber contains at least one of the following pulps: polyacrylonitrile pulp, aromatic amide pulp, polyester pulp, cellulose pulp and so on. The composite fiber can replace asbestos in composite materials of friction materials, sealing materials, cement concrete products and so on, the enhanced short fiber provides base mechanical strength, the adjuvant producing pulp fiber catches fine particles and inhibits components leaking, the adjuvant producing pulp fiber covers the face of short fiber and avoids the short fiber entanglement each other in the materials mixing process and the phenomenon of fiber balling up, the fiber has excellent integrated performance.

Description

technical field [0001] The invention relates to a kind of composite fiber for asbestos replacement, which includes reinforcing chopped fiber and auxiliary processing pulp fiber, wherein the pulp fiber is uniformly coated on the surface of the chopped fiber. Background technique [0002] As we all know, asbestos fiber is an inorganic fiber with excellent comprehensive properties such as flame retardancy, reinforcement, thixotropy, and processing aid. It is widely used in various fields such as friction materials, sealing materials, and cement and concrete products. Or it will cause serious harm to human health during use, and all countries in the world are working hard to find suitable non-asbestos fibers to replace asbestos fibers. [0003] At present, the asbestos fiber is used in composite materials such as friction, sealing materials, and cement concrete products, mainly including para-aramid pulp developed by DuPont of the United States and Teijin Corporation of Japan, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/31D06M15/59D06M15/507D06M15/05D06M23/00D01D5/26D06M101/28D06M101/24D06M101/36
Inventor 尤秀兰尤松陈洪新
Owner SHANGHAI LABON TECHNICAL FIBER CO LTD
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