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Method for continuously producing polyacryl-nitrile pulp-like fibre

A technique for producing polyacrylonitrile, which is applied in wet spinning, textile and papermaking, filament production, etc., can solve problems such as harsh process conditions and difficult control, and achieve simple chemical composition, simple energy consumption, and simplified production process Effect

Inactive Publication Date: 2012-04-25
SHANGHAI LABON TECHNICAL FIBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method omits spinning, cutting, grinding and other processes, which can greatly reduce the manufacturing cost, but the process conditions of this method are harsh and difficult to control.

Method used

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  • Method for continuously producing polyacryl-nitrile pulp-like fibre
  • Method for continuously producing polyacryl-nitrile pulp-like fibre

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Each 50wt% of the polyacrylonitrile polymer containing 11.5wt% vinyl acetate and the polyacrylonitrile polymer containing 5.5wt% vinyl acetate are dissolved in 44wt% sodium thiocyanate aqueous solution to form a two-component blend spinning Stock solution, the solution adopts conventional polyacrylonitrile fiber wet spinning process, including spinning, stretching, washing, drying and other processes, to obtain polyacrylonitrile tow with the same appearance as ordinary fiber tow but rich in microfibers inside .

example 2

[0026] The fiber tow that example 1 is obtained is cut into the chopped fiber that length is 4mm in fiber cutting machine, by hollow screw volume feeder, feeds into simultaneously with the deionized water of the speed of 50kg / h and 35t / h flow rate. The disc grinder that pushes the impeller at the feed port is ready to use in 40s -1 Under the action of a high shear rate, the polyacrylonitrile chopped fibers rich in internal microfibers are continuously dispersed and ground in the water phase, and the obtained slurry is dehydrated and dried, and the obtained polyacrylonitrile pulp-like fibers are opened. The distribution is 1.8±0.4mm, and the specific surface area is 12.9m 2 / g.

example 3

[0028] The fiber tow that example 1 is obtained is cut into the chopped fiber that length is 5mm in fiber cutting machine, by hollow screw volume feeder, feeds into simultaneously with the deionized water of the speed of 35kg / h and 40t / h flow rate. The disc grinder that pushes the impeller at the feed port is ready to use in 40s -1 Under the action of a high shear rate, the polyacrylonitrile chopped fibers rich in internal microfibers are continuously dispersed and ground in the water phase, and the obtained slurry is dehydrated and dried, and the obtained polyacrylonitrile pulp-like fibers are opened. The distribution is 2.0±0.4mm, and the specific surface area is 9.6m 2 / g.

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Abstract

The invention relates to a continuous manufacturing method of polypropylene fiber pulp (hereafter referred to as acrylic pulp). Apart from the excellent environment adaptability and the chemical reagents corrosion resistance of acrylic, the acrylic pulp also has the characteristics of a high degree of fibrillation and easy dispersion in aqueous phase, which can replace asbestos and used in friction, sealing materials, papermaking and other filed with a wide range of applications. The invention is in the use of two polyacrylonitrile polymers comprising the same monomer structure with differentproportions for the blending wet spinning. In the solidification process, the micro-phase separation of the mixed slurry of the polymers occurs, thus the polypropylene fiber pulp, in which the appearance is the same as the general fiber bundles while the internal micro-fiber is very rich, is formed. After the bundle is cut off, the short chopped fibers and water are transmitted and pumped into a grinding equipment at the same time, which are in the continuous dispersion and grinding under a high shear rate to be in the formation of the polypropylene fiber pulp with a uniform structure, rich hairiness on the appearance and a high degree of fibrillation. The whole process is continuous and simple with low energy consumption.

Description

technical field [0001] The invention relates to a continuous production method of polypropylene pulp-like fiber (hereinafter referred to as acrylic fiber pulp). Background technique [0002] Acrylic fiber pulp has what acrylic fiber itself has: excellent environmental adaptability, insensitivity to humidity and high service temperature, but also has a high degree of fibrillation, dispersive energy consumption in the matrix, and good dry and wet processing performance. specialty. In most cases, it can replace asbestos or aramid pulp and be used in many fields such as friction sealing materials, special paper, non-woven fabrics, etc., with high cost performance. At present, there are not many reports on the preparation technology of acrylic fiber pulp, only the following: acrylic fiber waste silk grinding method, centrifugal spinning method, plasticized melting extrusion grinding method and precipitation method. [0003] The Sterling company of the U.S. utilizes acrylic fibe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D11/00D01D5/06
Inventor 尤秀兰尤松陈洪新
Owner SHANGHAI LABON TECHNICAL FIBER CO LTD
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