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Preparation method of aramid fiber 1313 modified fiber

A modified fiber and aramid fiber technology, which is applied in the field of spinning fiber preparation technology, can solve the problems of low fiber strength and achieve the effects of improving performance, improving defoaming efficiency, improving mechanical strength and heat resistance

Active Publication Date: 2019-03-01
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the neutralization process, the fiber prepared by this method is limited by the nature of the stock solution itself, and the strength of the fiber prepared by it is low

Method used

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  • Preparation method of aramid fiber 1313 modified fiber
  • Preparation method of aramid fiber 1313 modified fiber
  • Preparation method of aramid fiber 1313 modified fiber

Examples

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preparation example Construction

[0032] The preparation method of the aramid fiber 1313 modified fiber of a specific embodiment of the present invention, comprises the following steps:

[0033] (1) Dissolve m-phenylenediamine in a polar solvent, freeze and cool the solution and mix it with molten isophthaloyl chloride and anhydride acid chloride in a low temperature environment to obtain aramid 1313 modified solution containing hydrogen chloride .

[0034] The anhydride acid chloride used is where R is one or more of them. The polyamic acid produced during the polymerization process will be dehydrated and cyclized during the dry heat stretching process of the fiber to further improve the fiber performance.

[0035] The molar ratio of m-phenylenediamine to acid chloride (isophthaloyl chloride + anhydride acid chloride) is 1:1.001-1:1.08, preferably 1:1.01-1:1.05. The acid anhydride acid chloride is 1-14% of the molar weight of m-phenylenediamine, preferably 5-10%.

[0036] The polar solvent is an amid...

Embodiment 1

[0055] Dissolve m-phenylenediamine in N,N-dimethylacetamide and lower the temperature to -15°C. m-Phenylenediamine mixed with isophthaloyl chloride and trimellitic anhydride acid chloride at a molar ratio of 1:1.02 at 20°C, wherein the molar weight of trimellitic anhydride acid chloride is 5% of the molar weight of m-phenylenediamine to prepare aramid 1313 modified resin The content is 18.5%, and the logarithmic viscosity is 2.05. Hydrogen chloride produced during the polymerization process with Ca(OH) 2 Neutralize, and remove the impurities produced during the neutralization process to obtain spinning dope.

[0056] After being defoamed by an umbrella-shaped vacuum membrane, the stock solution is filtered through a filter, and enters a coagulation bath through a 200-hole spinneret with a pore size of 0.08 mm. The content of water in the primary coagulation bath is 35%, the content of N, N-dimethylacetamide is 65%, and the drawing ratio is -60%; the content of water in the s...

Embodiment 2

[0058] Dissolve m-phenylenediamine in N,N-dimethylacetamide and lower the temperature to -18°C. m-Phenylenediamine mixed with isophthaloyl chloride and trimellitic anhydride acid chloride at a molar ratio of 1:1.04 at 18°C, wherein the molar weight of trimellitic anhydride acid chloride is 8% of the molar weight of m-phenylenediamine to prepare aramid 1313 modified resin The content is 21%, and the logarithmic viscosity is 2.15. The hydrogen chloride produced in the polymerization process is neutralized with ammonia gas, and the impurities produced in the neutralization process are removed to obtain the spinning dope.

[0059] After the stock solution is degassed by a conical vacuum membrane, it is filtered through a filter, and enters a coagulation bath through a 100-hole spinneret with a pore size of 0.08mm. The content of water in the primary coagulation bath is 35%, the content of N, N-dimethylacetamide is 65%, and the drawing ratio is -60%; the content of water in the se...

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Abstract

The invention discloses a preparation method of aramid fiber 1313 modified fiber. M-phenylenediamine, isophthaloyl dichloride and estolide acyl chloride are subjected to low-temperature solution polymerization in a polar solvent to obtain aramid fiber 1313 modified solution containing hydrogen chloride; a neutralizer is used for neutralizing the hydrogen chloride in the obtained aramid fiber 1313modified solution to obtain aramid fiber 1313 modified spinning raw solution; the obtained aramid fiber 1313 modified spinning raw solution is subjected to defoaming and filtering and then enters primary coagulating bath through a spinneret plate to obtain nascent fiber; and next, through secondary coagulating bath, hot water drafting, water washing, drying, dry heat drafting and hot shaping, thearamid fiber 1313 modified fiber is obtained. The obtained aramid fiber 1313 modified fiber has excellent mechanical property and heat resistant performance; the initial decomposing temperature is greater than 450 DEG C; the fracture intensity is greater than 5.6 cN / dtex, and the dispersion coefficient Cv is smaller than or equal to 5 percent; the break elongation rate is 10 to 50 percent, and thedispersion coefficient Cv is smaller than or equal to 8 percent.

Description

technical field [0001] The invention relates to a preparation process of spun fiber, in particular to a preparation method of high heat resistance, high strength and low dispersion aramid fiber 1313 modified fiber. Background technique [0002] Aromatic polyamide fiber is also called aramid fiber. This kind of polyamide fiber is a synthetic fiber made from aromatic compounds through polycondensation spinning. The main varieties are poly-p-phenylene terephthalamide fiber and polyisophthalamide fiber. Diformyl m-phenylenediamide fiber. It has excellent long-lasting thermal stability, flame retardancy and electrical insulation, and is used in the production of special protective clothing, high-temperature filter materials and honeycomb flame-retardant materials. [0003] At present, a method of preparing polym-phenylene isophthalamide fiber is low-temperature solution polymerization, and polym-phenylene isophthalamide is prepared by polymerization at a relatively low temperatu...

Claims

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Application Information

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IPC IPC(8): D01F6/80C08G69/32C08G69/28C08G69/40C08G69/42
CPCC08G69/28C08G69/32C08G69/40C08G69/42D01F6/805
Inventor 曹凯凯杨佑高敬民甘顺昌曹卓伍威宋志成李忠良袁锋
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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