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Para-aramid-acrylic compound pulp

A para-aramid fiber and composite pulp technology, applied in the direction of mechanical/thermomechanical pulp, paper, etc., can solve problems such as human health hazards, and achieve the effects of high efficiency in the production process, simple energy consumption, and high degree of fibrillation

Inactive Publication Date: 2011-06-15
YANCHENG LANBANG TECHN FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As we all know, asbestos fiber is an inorganic fiber material with excellent comprehensive properties such as flame retardancy, reinforcement, thixotropy, and processing aid. It is often widely used in various fields such as friction materials, sealing materials, and building materials. However, asbestos fiber products Whether it is produced or used, it will cause serious harm to human health, so researchers all over the world are working hard to find a new type of non-asbestos fiber to replace the existing asbestos fiber

Method used

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  • Para-aramid-acrylic compound pulp

Examples

Experimental program
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Effect test

example 1

[0021] Para-aramid chopped fibers with a length of 4mm and polyacrylonitrile chopped fibers with very rich internal microfibers are fed through a hollow screw volumetric feeder at a rate of 25kg / h and a flow rate of 35t / h respectively. Ionized water is fed into the disc grinder with impeller at the inlet at the same time, in 40s -1 Under the action of high shear rate, the para-aramid and polyacrylonitrile fibers are continuously mixed, dispersed and ground in the water phase, and the obtained slurry is dehydrated and dried, and the obtained para-aramid-polyacrylonitrile fiber is opened. Composite pulp fibers with a length distribution of 1.8±0.4mm and a specific surface area of ​​22.8m 2 / g.

example 2

[0023] Para-aramid chopped fibers with a length of 5 mm and polyacrylonitrile chopped fibers with rich internal microfibers are fed through a hollow screw volumetric feeder at a rate of 20 kg / h and a flow rate of 35 t / h, respectively. Ionized water is fed into the disc grinder with impeller at the inlet at the same time, in 40s -1 Under the action of high shear rate, the para-aramid and polyacrylonitrile fibers are continuously mixed, dispersed and ground in the water phase, and the obtained slurry is dehydrated and dried, and the obtained para-aramid-polyacrylonitrile fiber is opened. Composite pulp fibers with a length distribution of 2.0±0.4mm and a specific surface area of ​​17.9m 2 / g.

example 3

[0025] Para-aramid chopped fibers with a length of 3 mm and polyacrylonitrile chopped fibers with rich internal microfibers are fed through a hollow screw volumetric feeder at a rate of 30 kg / h and a flow rate of 35 t / h, respectively. Ionized water is fed into the disc grinder with impeller at the inlet at the same time, in 40s -1 Under the action of high shear rate, the para-aramid and polyacrylonitrile fibers are continuously mixed, dispersed and ground in the water phase, and the obtained slurry is dehydrated and dried, and the obtained para-aramid-polyacrylonitrile fiber is opened. Composite pulp fibers with a length distribution of 1.7±0.4mm and a specific surface area of ​​25.3m 2 / g.

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Abstract

The invention discloses a continuous manufacturing method of para-aramid-polyacrylonitrile compound pulp-shaped fiber (hereinafter referred to as para-aramid-acrylic compound pulp), comprising the steps of: inputting and pumping para-aramid chopped fiber, polyacrylonitrile chopped fiber internally rich in microfiber and water into grinding equipment; and continuously mixing, dispersing and grinding under a high chopping rate to form the highly fibrillated para-aramid-polyacrylonitrile compound pulp-shaped fiber which has even structure and abundant surface hair feather, wherein the whole process is completed in one step, the process is continuous and simple and the energy consumption is lower. The compound pulp replaces asbestos and is applied to friction sealing materials, not only has the properties such as high intensity, high mould and high temperature resistance of the para-aramid, but also has the excellent compound property of the polyacrylonitrile, greatly reduces the cost of replacing the asbestos, and has higher cost performance.

Description

technical field [0001] The invention belongs to the technical field of chemical fiber manufacturing. It relates to a manufacturing method of para-aramid fiber-polyacrylonitrile composite pulp fiber (hereinafter referred to as para-aramid fiber-acrylic fiber composite pulp), specifically combining para-aramid fiber and polyacrylonitrile chopped fiber A continuous manufacturing method in which the mixing, dispersing and grinding processes are completed in one step. Background technique [0002] As we all know, asbestos fiber is an inorganic fiber material with excellent comprehensive properties such as flame retardancy, reinforcement, thixotropy, and processing aid. It is often widely used in various fields such as friction materials, sealing materials, and building materials. However, asbestos fiber products Whether it is produced or used, it will cause serious harm to human health, so researchers all over the world are working hard to find a new type of non-asbestos fiber t...

Claims

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Application Information

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IPC IPC(8): D21H13/26D21H13/18D21D1/30D21H11/08
Inventor 尤松尤秀兰陈洪新
Owner YANCHENG LANBANG TECHN FIBER
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