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A kind of dissolving method of para-aramid and its application

A para-aramid and solution technology, applied in the field of para-aramid dissolution, to achieve the effects of easy control, good compatibility, and easy realization

Active Publication Date: 2016-04-13
国科广化(南雄)新材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a strong base and the organic solvent is limited to DMSO, which still has certain limitations for expanding the application of PPTA

Method used

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  • A kind of dissolving method of para-aramid and its application

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Experimental program
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Effect test

Embodiment 1

[0031] Weigh 0.1g of para-aramid pulp (purchased by Dupont), dissolve 0.1g of dodecylbenzenesulfonic acid in 2g of DMSO, put in the aramid pulp and stir well, heat to 50°C, and ultrasonically After 48 hours, stand still at 20°C until it becomes transparent, and remove a small amount of undissolved para-aramid in the lower layer by filtration to obtain a para-aramid solution with a mass fraction of 5%.

Embodiment 2

[0033] Weigh 0.15g of para-aramid pulp, dissolve 0.3g of camphorsulfonic acid in 4g of m-cresol, put in the aramid pulp and stir well, heat to 60°C, ultrasonic for 36h, and stand still at 25°C until transparent, remove a small amount of undissolved para-aramid in the lower layer by filtration, and obtain a para-aramid solution with a mass fraction of 3.75%.

Embodiment 3

[0035] Weigh 0.2g of para-aramid pulp, take 0.25g of C 8 h 17 Dissolve COOH in 2g of toluene, put in aramid pulp and stir evenly, heat to 60°C, ultrasonicate for 64 hours, stand still at 35°C until transparent, filter to remove a small amount of undissolved para-aramid in the lower layer, and obtain a mass fraction of 8% para-aramid solution.

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Abstract

The invention belongs to the technical field of aramid dissolution, and discloses a dissolving method that is simple, mild, effective and wide in organic solvent selection range of para-aramid and applications of the method. The method includes: adding the para-aramid into a mixed solution of a protonic acid and an organic solvent, heating, stirring uniformly, performing ultrasonic processing, allowing the solution to stand at room temperature until the solution is clear, and filtering to obtain a para-aramid solution. The method is mild in reactions. According to the method, the H+ of the protonic acid and N in the molecular chains of the para-aramid are combined, and the protonated para-aramid is dissolved in the organic solvent by countra-ion-M-R induction, thus avoiding strong acids or alkalis used in traditional para-aramid dissolving methods. A para-aramid solution having a concentration of 2-8 wt% can be obtained. By adjustment of the -R group of the protonic acid, the para-aramid can have good compatibility with many solvents, thus solving a problem of incapability of dissolution and application in the solvents in the traditional methods, and widening the application scope after the para-aramid is dissolved.

Description

technical field [0001] The invention belongs to the technical field of aramid fiber dissolution, and in particular relates to a method for dissolving para-aramid fibers with a simple, mild and effective preparation method and a wide selection range of organic solvents and an application thereof. Background technique [0002] The chemical name of para-aramid is poly-p-phenylene terephthalate (PPTA), which is called aramid-1414 in China, and the product named Kevlar was developed by DuPont in the 1960s and launched in the 1970s. High-performance para-aramid fiber industrialized in the 1990s. PPTA has excellent properties such as high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight due to its molecular chains being highly oriented along the length direction and having a strong interchain bonding force. The outstanding features of PPTA properties are high strength and high modulus. The strength of para-position fiber is 3 times...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/09C08L77/10
Inventor 胡继文吴艳胡盛逾涂园园刘锋刘国军林树东杨洋苗磊李妃
Owner 国科广化(南雄)新材料研究院有限公司
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