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Method for washing meta-aramid fibrid

A kind of aramid fiber and washing method technology, which is applied to the washing field of meta-aramid fiber, can solve the problems of high cost of recycling energy consumption, large washing water equivalent, speeding up the replacement rate of chlorinated salt washing, and the like. The effect of reducing the energy consumption of solvent recovery, increasing the penetration rate and improving product quality

Active Publication Date: 2017-02-01
四川辉腾科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is aimed at the above washing technical problems, and provides a washing method for meta-aramid precipitated fibers. The method uses acid washing, adding hydrochloric acid to the washing water, decomposing the oligomers to dissolve them in the washing water, and acidifying them. The surface of the fiber is crusted, which speeds up the washing replacement rate of chloride salt, and solves the problems of large washing water equivalent and high energy recovery cost in the existing meta-aramid precipitation fiber washing technology

Method used

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  • Method for washing meta-aramid fibrid
  • Method for washing meta-aramid fibrid
  • Method for washing meta-aramid fibrid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Prepare sedimentation fiber suspension: 20~100m 3 / batch, mass percentage content 0.1 ~ 1%.

[0025] (2) Pass the precipitated fiber suspension into the first-stage washing bed, spray the washing water from the second-stage washing water collection tank on the surface of the moving filter screen, suck the washing water and solution from the bottom of the filter screen, and pass through the soda water The solution collected by the separation tank is sent to the solvent recovery device; washing water equivalent: ≤40Kg / Kg (dry basis); operating pressure: 100KPa~20KPa (absolute pressure);

[0026] (3) The fibers washed by the first stage are transported to the second stage washing bed, sprayed with the washing water of the third stage washing water collection tank, sucked the washing water, enter the separation tank for steam-water separation, and the collected washing water is transferred to Second stage washing water collection tank; washing water equivalent: ≤40Kg / ...

Embodiment 2

[0034] (1) Prepare sedimentation fiber suspension: 20~100m 3 / batch, mass percentage content 0.1 ~ 1%.

[0035] (2) Pass the precipitated fiber suspension into the first-stage washing bed, spray the washing water from the second-stage washing water collection tank on the surface of the moving filter screen, suck the washing water and solution from the bottom of the filter screen, and pass through the soda water The solution collected by the separation tank is sent to the solvent recovery device; washing water equivalent: ≤50Kg / Kg (dry basis); operating pressure: 100KPa~20KPa (absolute pressure);

[0036] (3) The fibers washed by the first stage are transported to the second stage washing bed, sprayed with the washing water of the third stage washing water collection tank, sucked the washing water, enter the separation tank for steam-water separation, and the collected washing water is transferred to Second stage washing water collection tank; washing water equivalent: ≤50Kg / ...

Embodiment 3

[0044] (1) Prepare sedimentation fiber suspension: 20~100m 3 / batch, mass percentage content 0.1 ~ 1%.

[0045] (2) Pass the precipitated fiber suspension into the first-stage washing bed, spray the washing water from the second-stage washing water collection tank on the surface of the moving filter screen, suck the washing water and solution from the bottom of the filter screen, and pass through the soda water The solution collected by the separation tank is sent to the solvent recovery device; washing water equivalent: ≤40Kg / Kg (dry basis); operating pressure: 100KPa~20KPa (absolute pressure);

[0046] (3) The fibers washed by the first stage are transported to the second stage washing bed, sprayed with the washing water of the third stage washing water collection tank, sucked the washing water, enter the separation tank for steam-water separation, and the collected washing water is transferred to Second stage washing water collection tank; washing water equivalent: ≤40Kg / ...

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Abstract

The invention relates to the technical field of special synthesized fiber manufacturing, and in particular to a method for washing meta-aramid fibrid. The method comprises the following steps: performing continuous washing for six stages in sequence, from the sixth time of washing, performing countercurrent washing with pure water, recycling separated washing water for a former washing stage, and adding acid into washing water of the fourth stage to the first stage so as to acidify the fiber in an acid washing solution, so that the caked surface of the fiber is loosed, the infiltration rate of the washing water is increased, and diffusion dissolution of Cl- and chlorizated salts in the washing water in the fiber is accelerated; meanwhile, oligomers in the acid washing solution can be subjected to acidolysis and can be decomposed into acid hydrolysate which can be dissolved in the washing water, so that the product quality can be improved. By adopting the method, the content of Cl- ions of a fibrid product obtained by using the method can be less than or equal to 50PPm, the original beating degree of the fibrid product can be 35-50 DEG SR, the thermal shrinkage rate of the fibrid product at 240 DEG C is less than or equal to 20%, and the washing water equivalent of the fibrid product on a dry basis Kg is less than or equal to 40Kg.

Description

technical field [0001] The invention relates to the technical field of manufacturing special synthetic fibers, in particular to a washing method for meta-aramid precipitated fibers. Background technique [0002] The precipitated fiber of meta-aramid 1313 is a high-temperature-resistant special fiber with excellent comprehensive properties. It has excellent thermal stability, flame retardancy, electrical insulation, chemical stability, and radiation resistance. It is used in the manufacture of electrical insulation Paper, high-temperature filter materials, honeycomb structure materials, etc. have a wide range of uses. [0003] The production process of precipitated fiber generally includes four production unit operations of synthetic resin, resin precipitation, fiber washing, and solvent recovery. The first step of fiber washing is to separate the precipitated fiber from the solution, and the second step is to wash the solution wrapped inside the fiber and attached to the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D10/06
CPCD01D10/06
Inventor 韩和平谢静彭华
Owner 四川辉腾科技股份有限公司
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