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A modification method of para-aramid chopped fiber

A technology of chopped fiber and para-aramid fiber, which is used in the paper industry, can solve the problems of poor wettability and poor interface adhesion, and achieve the effect of improving high temperature resistance, friction and wear resistance, interface bonding performance, and surface inertness.

Active Publication Date: 2019-07-16
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a modification method of para-aramid chopped fibers, which solves the problems of poor wettability of para-aramid chopped fibers and poor interfacial adhesion with matrix materials

Method used

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  • A modification method of para-aramid chopped fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Fiber pretreatment: Add para-aramid chopped fibers into water, wash them with sodium dodecylbenzenesulfonate in a water bath at 50°C for 20 minutes, rinse them with distilled water, and dry them for later use. Prepare a mixed acid solution, which is a mixed solution of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 3:1. Put the cleaned chopped fibers into the mixed acid solution, oxidize it, and then wash it with water and dry it for later use.

[0030] (2) Fiber modification process: ultrasonically disperse the oxidized chopped fibers in a stable and uniform mixed solution (the mixed solution is a mixture of absolute ethanol, deionized water and ammonia water at a volume ratio of 10:3:1) . Then, TEOS (tetraethyl orthosilicate) was added rapidly, and the resulting mixture was stirred at room temperature for 12 h to allow it to react.

[0031] (3) Fiber post-treatment: After the reaction is completed, the fiber mixture is vacuum-filte...

Embodiment 2

[0033] (1) Fiber pretreatment: p-aramid chopped fiber pretreatment: add p-aramid chopped fiber into water, wash with sodium dodecylbenzenesulfonate in a water bath at 60°C for 30 minutes, and then use Rinse with distilled water and dry for later use. Prepare a mixed acid solution, which is a mixed solution of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 3:1. Put the cleaned chopped fibers into the mixed acid solution, oxidize it, and then wash it with water and dry it for later use.

[0034] (2) Fiber modification process: ultrasonically disperse the oxidized chopped fibers in a stable and uniform mixed solution (the mixed solution is a mixture of absolute ethanol, deionized water and ammonia water at a volume ratio of 10:3:1) . Then, TEOS (tetraethyl orthosilicate) was added rapidly, and the resulting mixture was stirred at room temperature for 13 h to allow it to react.

[0035] (3) Fiber post-treatment: After the reaction is completed, th...

Embodiment 3

[0037] (1) Fiber pretreatment: p-aramid chopped fiber pretreatment: add p-aramid chopped fiber into water, wash with sodium dodecylbenzenesulfonate in a water bath at 70°C for 40 minutes, and then wash with Rinse with distilled water and dry for later use. Prepare a mixed acid solution, which is a mixed solution of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 3:1. Put the cleaned chopped fibers into the mixed acid solution, oxidize it, and then wash it with water and dry it for later use.

[0038] (2) Fiber modification process: ultrasonically disperse the oxidized chopped fibers in a stable and uniform mixed solution (the mixed solution is a mixture of absolute ethanol, deionized water and ammonia water at a volume ratio of 10:3:1) . Then, TEOS (tetraethyl orthosilicate) was added rapidly, and the resulting mixture was stirred at room temperature for 15 h to allow it to react.

[0039] (3) Fiber post-treatment: After the reaction is complet...

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Abstract

The invention discloses a modification method of p-aramid fiber chopped fiber. A mixed acid solution is used for performing coarsening pretreatment on the cleaned p-aramid fiber chopped fiber; a sol-gel method is used for performing nanometer SiO2 modification on the surface of the p-aramid fiber chopped fiber subjected to pretreatment to obtain the modified p-aramid fiber chopped fiber. The modification method of the p-aramid fiber chopped fiber has the advantages that the sol-gel method is used; tetraethoxysilane is used as a precursor; the tetraethoxysilane is hydrolyzed by ammonium hydroxide in an ethanol medium; the nanometer SiO2 particles are subjected to in situ synthesis on the fiber surface; the smooth insert surface without active groups of the fiber is improved. The nanometer SiO2 synthesized on the surface of the fiber has good heat-resistant and wear-resistant performance, and can be used as a composite material enhancing body for improving the high-temperature-resistant friction-resistant and abrasion-resistant performance of the material.

Description

technical field [0001] The invention belongs to the technical field of papermaking industry, and in particular relates to a method for modifying para-aramid chopped fibers. Background technique [0002] Aramid fiber is a general term for aromatic polyamide fibers. It is a synthetic fiber first developed by DuPont in the United States in the 1960s and 1970s. According to different chemical structures, aramid fibers can be divided into meta-aramid fibers. fiber and para-aramid fiber. After meta-aramid was researched and industrialized by DuPont of the United States, the product was registered as Our country is called aramid fiber 1313; para-aramid fiber (referred to as PPTA) was officially named after it was put into production. Our country is called aramid fiber 1414. [0003] Para-aramid fiber (PPTA) is a polymer obtained by polycondensation of p-phenylenediamine and terephthaloyl chloride dissolved in concentrated sulfuric acid, hydrofluoric acid or chlorosulfonic acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/256D06M11/55D06M11/65D06M11/79D06M101/36
CPCD06M11/55D06M11/65D06M11/79D06M13/256D06M2101/36
Inventor 陆赵情胡文静张美云花莉谢璠赵永生杨斌宋顺喜
Owner SHAANXI UNIV OF SCI & TECH
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