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Method for preparing lignin/polyacrylonitrile blend melt-spun fiber by physical blending

A technology of polyacrylonitrile and physical blending, applied in the fields of fiber chemical characteristics, rayon manufacturing, conjugated rayon, etc., can solve the problems of unfavorable environmental protection promotion, waste, etc., so as to save the treatment of "three wastes" and reduce production Cost, saving effect of solvent consumption

Active Publication Date: 2016-05-04
优聚新材料(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the solution spinning method, a large amount of toxic and seriously polluting organic solvents are inevitably used in the wet spinning process, which is not conducive to environmental protection and widespread promotion, and causes a lot of waste at the same time.

Method used

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  • Method for preparing lignin/polyacrylonitrile blend melt-spun fiber by physical blending
  • Method for preparing lignin/polyacrylonitrile blend melt-spun fiber by physical blending
  • Method for preparing lignin/polyacrylonitrile blend melt-spun fiber by physical blending

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The air humidity was kept at 5%, and the lignin, polyacrylonitrile powder and plasticizer, which were vacuum-dried at 60°C for 24 hours, were evenly mixed in a high-speed rotary mixer at a mass ratio of 10:30:60, and then the mixed materials were added to Into the closed hopper of the twin-screw spinning machine, carry out blending and melting at 140°C to obtain a homogeneously mixed blend melt; the fine flow of the blend melt flowing out from the spinneret through the spinning assembly passes through 30 ℃ hot air setting, winding at a winding speed of 100m / min to obtain melt-spun fibers; the above-mentioned fibers are further drawn in a water bath, the temperature of the water bath is 60 ℃, and the total draw ratio is 3 times, that is, lignin / Polyacrylonitrile blend melt-spun fibers. The obtained melt-spun fiber has a strength of 5.33cN / dtex, an elongation at break of 8.4%, and a degree of orientation of 80.5%.

Embodiment 2

[0031] The air humidity was kept at 8%, and the lignin, polyacrylonitrile powder and plasticizer, which were vacuum-dried at 60°C for 24 hours, were evenly mixed in a high-speed rotary mixer at a mass ratio of 15:25:60, and then the mixed materials were added to In the closed hopper of the twin-screw spinning machine, blend and melt at 160°C to obtain a homogeneously mixed blend melt; the fine flow of the blend melt flowing out from the spinneret through the spinning assembly passes through 30 ℃ hot air setting, winding at a winding speed of 200m / min to obtain melt-spun fibers; the above-mentioned fibers are further drawn in a water bath, the temperature of the water bath is 50 ℃, and the total draw ratio is 2.5 times, that is, lignin / Polyacrylonitrile blend melt-spun fibers. The obtained melt-spun fiber has a strength of 5.20cN / dtex, an elongation at break of 9.2%, and a degree of orientation of 85.2%.

Embodiment 3

[0033] The air humidity is kept at 10%, and the lignin, polyacrylonitrile powder and plasticizer that have been vacuum-dried at 60°C for 24 hours are mixed evenly in a high-speed rotary mixer at a mass ratio of 20:20:60, and then the mixture is added to In the closed hopper of the twin-screw spinning machine, blend and melt at 180°C to obtain a homogeneously mixed blend melt; the fine flow of the blend flowing out of the spinneret through the spinning assembly passes through a 40°C Hot air setting, winding at a winding speed of 200m / min to obtain melt-spun fibers; the above-mentioned fibers are further drawn in a water bath, the temperature of the water bath is 70°C, and the total draw ratio is 2.5 times, that is, lignin / polypropylene Nitrile blend melt spun fibers. The obtained melt-spun fiber has a strength of 4.52cN / dtex, an elongation at break of 9.5%, and a degree of orientation of 87.6%.

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Abstract

The invention relates to a method for preparing lignin / polyacrylonitrile blended melt-spun fiber by adopting physical blending. The method comprises the steps of evenly mixing polyacrylonitrile, lignin and plasticizer, then adding mixed materials into a closed feed hopper of a double-screw spinning machine, carrying out melt-spinning at 140-220DEG C, and performing hot-air setting, washing and drafting, and winding to obtain lignin / polyacrylonitrile blended melt-spun fiber. According to the method, the active ingredient lignin is low in cost, less in environment pollution and suitable for industrial production; the lignin contains a great amount of hydroxyl groups which can have hydrogen-bond interaction with polar group cyano on polyacrylonitrile molecular chains, and the two have better compatibility; the section of the fiber is round, so that the skin-core difference is small, and the structure of the fiber is compact and uniform; due to the addition of lignin, the thermal performance and oxidation resistance of the fiber can be enhanced, and the degradation capability can be improved.

Description

technical field [0001] The invention belongs to the field of polymer blend melt spinning, in particular to a method for preparing lignin / polyacrylonitrile blend melt spinning fibers by physical blending. Background technique [0002] In the pulp and paper industry, a large amount of cellulose is separated from plants every year, and about 50 million tons of lignin by-products are obtained, mainly alkali lignin and lignosulfonate. Lignin is thermoplastic, and has the advantages of being renewable, degradable, and non-toxic. The glass transition temperature of lignin is between 127°C and 193°C, and varies with the molecular formula and chemical structure of lignin and the water content. The lignin of biomass contains a large number of functional groups: aromatic nucleus, phenolic group and carbonyl group, alcoholic hydroxyl group, vinyl group, benzyl alcohol, alkyl ether bond, aryl ether bond, etc. Due to the existence of phenolic group and alcoholic hydroxyl group, lignin I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/08D01F8/18D01F1/10
Inventor 余木火陈磊刘淑萍张静洁张文辉田银彩王海风韩克清柯胜包张建军景鹏展吴玉霞王会峰
Owner 优聚新材料(浙江)有限公司