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Aramid fiber modification method

A kind of aramid fiber and aramid chopped fiber technology, which can be used in fiber raw material processing, synthetic cellulose/non-cellulose material pulp/paper, textiles and paper making, etc. problems, to achieve the effects of excellent temperature resistance, high aspect ratio, and reduced production costs

Active Publication Date: 2021-09-14
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for modifying aramid fiber to overcome the problems of smooth and hydrophobic surface, strong inertness and few active groups of chopped aramid fiber, so as to make it an excellent building block for preparing high-performance composite materials

Method used

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  • Aramid fiber modification method

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Embodiment 1

[0033] A method for modifying aramid fibers, using the blending of aramid nanofiber / dimethyl sulfoxide dispersion and aramid chopped fiber / water dispersion to realize in-situ protonation reduction and compounding of aramid nanofibers to prepare aramid fibers Aramid composite fiber covered by nanofiber network; wherein the mass ratio of aramid nanofiber to aramid fiber is 10:90.

[0034] A method for modifying aramid fibers, comprising the steps of:

[0035] Step 1: Prepare aramid chopped fiber / water dispersion: take a certain quality of meta-aramid chopped fiber and one of para-aramid chopped fiber and disperse it in water, stir and disperse it through a standard fiber deflagging machine for 15000r, Obtaining a chopped fiber slurry with a mass concentration of 1.5%;

[0036] Step 2: Prepare aramid nanofiber / dimethyl sulfoxide dispersion: take the recovered para-aramid cloth as raw material in potassium hydroxide / dimethyl sulfoxide / water (KOH / DMSO / H 2 O) a deprotonation react...

Embodiment 2

[0040] A method for modifying aramid fibers, using the blending of aramid nanofiber / dimethyl sulfoxide dispersion and aramid chopped fiber / water dispersion to realize in-situ protonation reduction and compounding of aramid nanofibers to prepare aramid fibers An aramid composite fiber covered by a nanofiber network; wherein the mass ratio of the aramid nanofiber to the aramid fiber is 20:80.

[0041] A method for modifying aramid fibers, comprising the steps of:

[0042] Step 1: Prepare aramid chopped fiber / water dispersion: take a certain quality of meta-aramid chopped fiber and one of para-aramid chopped fiber and disperse it in water, stir and disperse it through a standard fiber deflagging machine for 15000r, Obtaining a chopped fiber slurry with a mass concentration of 1.2%;

[0043] Step 2: Prepare aramid nanofiber / dimethyl sulfoxide dispersion: take the recycled para-aramid waste silk as raw material in potassium hydroxide / dimethyl sulfoxide / water (KOH / DMSO / H 2 O) a de...

Embodiment 3

[0047] A method for modifying aramid fibers, using the blending of aramid nanofiber / dimethyl sulfoxide dispersion and aramid chopped fiber / water dispersion to realize in-situ protonation reduction and compounding of aramid nanofibers to prepare aramid nanofibers Aramid composite fibers covered by fiber network; wherein the mass ratio of aramid nanofibers to aramid fibers is 30:70.

[0048] A method for modifying aramid fibers, comprising the steps of:

[0049] Step 1: Prepare aramid chopped fiber / water dispersion: take a certain quality of meta-aramid chopped fiber and one of para-aramid chopped fiber and disperse it in water, stir and disperse it through a standard fiber deflagging machine for 15000r, Obtaining a chopped fiber slurry with a mass concentration of 1.0%;

[0050] Step 2: Prepare aramid nanofiber / dimethyl sulfoxide dispersion: take the recycled para-aramid yarn waste as raw material in potassium hydroxide / dimethyl sulfoxide / water (KOH / DMSO / H 2 O) a deprotonatio...

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Abstract

The invention discloses an aramid fiber modification method. According to the aramid fiber modification method, aramid chopped fibers is modified by using an aramid nanofiber dispersion liquid so as to construct a multi-level micro / nano coarse structure on the smooth surface of the aramid fibers to obtain aramid nanofiber-coated aramid composite fibers which have high specific surface area, high mechanical strength and excellent temperature resistance, can overcome the problems of smooth and hydrophobic surface, strong inertia, few active groups and the like of a traditional chopped fiber and become an optimal construction unit for preparing a high-performance composite material. High-performance aramid paper is prepared by taking the obtained aramid nanofiber-modified aramid chopped fibers as a single raw material, and aramid pulp fiber or aramid fibrid does not need to be prepared, so the problems of loose paper structure, poor interface bonding force, low mechanical strength and compression strength and the like caused by large component dimension difference of the aramid paper are avoided; and the prepared aramid paper has a compact paper structure, high strength, high modulus and excellent compression strength, and is expected to be applied to the fields of advanced electrical insulation, structural weight reduction honeycomb materials and the like.

Description

technical field [0001] The invention belongs to the field of polymer fiber and papermaking, and in particular relates to a method for modifying aramid fiber. Background technique [0002] As one of the "three high-performance fibers", aramid fiber (aramid fiber, AF) has high strength, high modulus, excellent temperature resistance and chemical stability. One of a wide range of specialty fibers. It can be used not only as a structural material to carry loads, but also as a functional material. It is widely used in personal protection, electronic communications, petrochemicals, aerospace and other fields. However, due to the characteristics of the fiber itself such as smooth hydrophobic surface, strong inertness, few active groups, and poor hydrophilicity, aramid fibers have weak interfacial bonding with the matrix when they are used in resin-based composite materials and other fields. , which greatly affects the overall performance of the material. Aramid paper prepared fr...

Claims

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Application Information

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IPC IPC(8): D21H13/26
CPCD21H13/26Y02W30/62
Inventor 杨斌张美云刘佳伟宋顺喜谭蕉君聂景怡
Owner SHAANXI UNIV OF SCI & TECH
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