Preparation method for copolymerization modification aramid 1313 fiber

A technology of copolymerization modification and aramid fiber is applied in the field of spinning fibers, which can solve the problems of complicated operation, high process cost, increase process flow, etc., and achieve the effects of low process cost, simple operation and improved production efficiency.

Pending Publication Date: 2019-12-20
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These modification methods are mainly aimed at aramid Ⅲ fiber and para-aramid fiber, and rarely involve the modification of aramid 1313

Method used

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  • Preparation method for copolymerization modification aramid 1313 fiber
  • Preparation method for copolymerization modification aramid 1313 fiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of preparation method of copolymerization modified aramid fiber 1313 fiber of the present invention, its technological process schematic diagram is as figure 1 shown, including the following steps:

[0040] (1) dissolving m-phenylenediamine and 3,5-diaminobenzoic acid in N,N-dimethylacetamide at a molar ratio of 1:0.1 to obtain a mixed solution, and cooling the mixed solution to -15°C; The isophthaloyl chloride is melted and kept at a temperature of 50°C; the molar ratio of diamine (including m-phenylenediamine and aromatic diamine with polar groups) to isophthaloyl chloride is 1: 1.03, the mixed solution and isophthaloyl chloride were mixed and reacted at 0°C to obtain a copolymerized modified aramid 1313 solution containing hydrogen chloride. The content of the copolymerized modified aramid 1313 resin in the solution was 18.5%, and the logarithmic density The viscosity is 2.18;

[0041] (2) Using ammonia gas to neutralize the hydrogen chloride in the copolyme...

Embodiment 2

[0044] A kind of preparation method of copolymerization modified aramid fiber 1313 fiber of the present invention, its technological process schematic diagram is as figure 1 shown, including the following steps:

[0045] (1) dissolving m-phenylenediamine and 3,5-diaminobenzoic acid in N,N-dimethylacetamide at a molar ratio of 1:0.25 to obtain a mixed solution, and cooling the mixed solution to -15°C; Melting isophthaloyl chloride, keeping its temperature at 48°C; according to the molar ratio of diamine (including m-phenylenediamine and aromatic diamine with polar groups) to isophthaloyl chloride is 1: 1.04, the mixed solution and isophthaloyl chloride were mixed and reacted at 10°C to obtain a copolymerized modified aramid 1313 solution containing hydrogen chloride. The content of the copolymerized modified aramid 1313 resin in the solution was 21%, and the logarithmic density The viscosity is 2.02;

[0046] (2) Using LiOH to neutralize the hydrogen chloride in the copolymer...

Embodiment 3

[0049] A kind of preparation method of copolymerization modified aramid fiber 1313 fiber of the present invention, its technological process schematic diagram is as figure 1 shown, including the following steps:

[0050] (1) dissolving m-phenylenediamine and 3,5-diaminobenzoic acid in N,N-dimethylacetamide at a molar ratio of 1:0.6 to obtain a mixed solution, and cooling the mixed solution to -15°C; The isophthaloyl chloride is melted and kept at a temperature of 50°C; the molar ratio of diamine (including m-phenylenediamine and aromatic diamine with polar groups) to isophthaloyl chloride is 1: 1.05, the mixed solution and isophthaloyl chloride were mixed and reacted at 5°C to obtain a copolymerized modified aramid 1313 solution containing hydrogen chloride. The content of the copolymerized modified aramid 1313 resin in the solution was 20%, and the logarithmic density The viscosity is 1.85;

[0051] (2) Using LiOH to neutralize the hydrogen chloride in the copolymerized mod...

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Abstract

The invention provides a preparation method for a copolymerization modification aramid 1313 fiber. The preparation method includes the following steps that m-phenylenediamine and aromatic diamine withpolar groups are dissolved in a amide solvent, and a mixed solution is frozen and cooled and then subjected to a mixed reaction with a fused isophthaloyl dichloride in a low-temperature environment,so that a copolymerization modification aramid solution is obtained; a neutralizing agent is adopted for neutralizing and conducting impurity removal on the copolymerization modification aramid solution, so that a spinning stock solution is obtained; the spinning stock solution is subjected to vacuum defoaming and filtering and then enters a first-stage coagulating bath through a spinneret plate,and then through a second-stage coagulating bath, hot water drafting, washing, drying, oil applying, dry heat stretching, heat setting, cooling oil applying and rolling, the copolymerization modification aramid 1313 fiber is obtained. Through the method, the surface polarity of the fiber is optimized basically, a complex technological process that after the fiber is made, the surface of the fiberis modified is avoided, and production efficiency is improved; meanwhile, technological costs are low, operation is easy, safe and environmentally friendly, and the fiber is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of spinning fibers, and in particular relates to a preparation method of copolymerized modified aramid fiber 1313. Background technique [0002] Aramid 1313 fiber has excellent high temperature resistance and flame retardant properties, good spinnability and dimensional stability, and good mechanical properties. It is currently the most mature and widely used essential flame retardant fiber. No. 2 for specialty fibers. Since there is no polar group in the molecular structure of aramid fiber 1313, the binding force between the molecules of aramid fiber 1313 and between the molecules of aramid fiber 1313 and other molecules is poor, resulting in the problem of poor wettability of the aramid fiber 1313 fiber with the matrix resin during use. , it is necessary to modify the surface of aramid 1313 fiber to improve its performance. [0003] Chinese patent application CN201010108492.8 provides a method of fluorin...

Claims

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Application Information

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IPC IPC(8): D01F6/80C08G69/36D01D5/06D01D5/12D01D5/14D01D10/02
CPCC08G69/36D01D5/06D01D5/12D01D5/14D01D10/02D01F6/805
Inventor 曹凯凯杨军杨佑王进刘含茂程海涛
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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