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Method for producing aramid fiber fibrid

A kind of technology of aramid fiber and production method, applied in the field of polymer, can solve the problem of no national standard, achieve the effect of stable quality, simplify the process flow, and broaden the application field

Inactive Publication Date: 2018-03-20
菲博(郁南)纤维新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The characterization indicators of precipitated fibers include: size distribution, beating degree, water retention value, specific surface area, shape, wet strength, molecular weight distribution and crystallinity, etc., and there is no national standard at present

Method used

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  • Method for producing aramid fiber fibrid
  • Method for producing aramid fiber fibrid
  • Method for producing aramid fiber fibrid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Resin synthesis and dilution: put 200Kg of dimethylacetamide solvent, 12.2Kg of m-phenylenediamine, and 9.4Kg of p-phenylenediamine into a 1000L polymerization reactor, start stirring under the protection of nitrogen and fully dissolve them, then put them into the jacket of the polymerization reactor Feed into the refrigerated liquid to reduce the temperature in the kettle to -9°C. At this time, adjust the stirring speed of the polymerization reactor to 280 rpm, keep the circulation of the refrigerated liquid, and put 40.6Kg of isophthaloyl chloride into the polymerization reactor for reaction. When the thick viscosity is 1100, add dimethylacetamide to the polymerization reactor to dilute and terminate the reaction. The polymerization reaction lasts for 20 minutes. When the polymer solution is diluted to a reduced viscosity of 120, stop adding solvent. Add 14.8Kg calcium hydroxide to carry out neutralization reaction in the polymerization kettle.

[0068] Coagulation so...

Embodiment 2

[0072] Resin synthesis and dilution: Put 200Kg of dimethylacetamide solvent, 16.2Kg of m-phenylenediamine, 5.4Kg of p-phenylenediamine into a 1000L polymerization reactor, turn on the stirring under the protection of nitrogen and fully dissolve it, then put it into the jacket of the polymerization reactor Feed into the refrigerated liquid to reduce the temperature in the kettle to -9°C. At this time, adjust the stirring speed of the polymerization reactor to 280 rpm, keep the circulation of the refrigerated liquid, and put 40.6Kg of isophthaloyl chloride into the polymerization reactor for reaction. When the thick viscosity is 1200, add dimethylacetamide to the polymerization reactor to dilute and terminate the reaction. The polymerization reaction takes 23 minutes. When the polymer solution is diluted to a reduced viscosity of 150, stop adding solvent. Add 14.8Kg calcium hydroxide to carry out neutralization reaction in polymerization reactor.

[0073] Coagulation solution pr...

Embodiment 3

[0077] Resin synthesis and dilution: Put 200Kg of dimethylacetamide solvent, 19.2Kg of m-phenylenediamine, and 2.4Kg of p-phenylenediamine into a 1000L polymerization reactor, start stirring under nitrogen protection and fully dissolve it, then put it into the jacket of the polymerization reactor Feed into the refrigerated liquid to reduce the temperature in the kettle to -9°C. At this time, adjust the stirring speed of the polymerization reactor to 280 rpm, keep the circulation of the refrigerated liquid, and put 40.6Kg of isophthaloyl chloride into the polymerization reactor for reaction. When the thick viscosity is 1400, add dimethylacetamide to the polymerization reactor to dilute and terminate the reaction. The polymerization reaction lasts for 25 minutes. When the polymer solution is diluted to a reduced viscosity of 180, stop adding solvent. Add 14.8Kg calcium hydroxide to carry out neutralization reaction in polymerization reactor.

[0078] Coagulation solution prepara...

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Abstract

The invention relates to a method for producing aramid fiber fibrid and belongs to the technical field of macromolecules. The method for producing the aramid fiber fibrid, provided by the invention, comprises the following steps: (1) dissolving m-phenylenediamine and p-phenylenediamine in a polar organic solvent under the protection of an inert gas atmosphere, so as to obtain a stock solution; (2)cooling the temperature of the stock solution to -8 DEG C to -12 DEG C, adding m-phthaloyl chloride for a polymerization reaction, adding a polar organic solvent for dilution when the reduced viscosity is 1,000 to 1,500, and terminating the reaction, so as to obtain a polymer solution; (3) subjecting the polymer solution to diluting, neutralizing, settling out, curing, filtering, washing and dewatering, thereby obtaining the aramid fiber fibrid. According to the method, the molecular weight size and distribution thereof of resin are easily controlled, and the product performance index of thearamid fiber fibrid can also be adjusted in view of the requirements of different application fields.

Description

technical field [0001] The invention relates to a production method of aramid fibrids, which belongs to the technical field of macromolecules. Background technique [0002] Aramid precipitated fiber is a kind of high-temperature-resistant special fiber with excellent comprehensive performance and excellent thermal stability: it can be used for more than 10 years at 220°C, and it can be heated at 240°C for 1000 hours, and its mechanical strength still maintains 65% of the original , only decomposes a small amount of gas above 370°C; flame retardancy: self-extinguishing, the surface is carbonized when burning at high temperature, does not support combustion, and does not produce molten droplets; electrical insulation: the breakdown voltage of aramid insulating paper can reach 10kv / mm; Spinnability, chemical stability, radiation resistance, widely used in electrical insulating paper, high temperature filter materials, protective clothing, honeycomb structure materials, etc. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/32D01F6/80
CPCC08G69/265C08G69/32D01F6/805
Inventor 钟家春
Owner 菲博(郁南)纤维新材料科技有限公司
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