Preparation method of para/meta aramid composite paper

A technology of para-aramid and composite paper, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, paper, papermaking, etc., to achieve the effect of improved paper crystallinity, regular and orderly molecular chain arrangement, and tight fiber bonding

Active Publication Date: 2016-12-21
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although aramid chopped fibers and pulp have homologous structures, there i

Method used

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  • Preparation method of para/meta aramid composite paper
  • Preparation method of para/meta aramid composite paper
  • Preparation method of para/meta aramid composite paper

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preparation example Construction

[0030] A preparation method of para-position / meta-aramid fiber composite paper of the present invention, specifically comprises the following steps:

[0031] Step 1, pretreating para-aramid chopped fibers;

[0032] The pretreatment process of para-aramid chopped fibers is as follows: the para-aramid chopped fibers are mixed at a molar concentration of 1.0×10 - 3 mol / L~3×10 -3 mol / L, soak in sodium dodecylbenzenesulfonate solution at 40°C-60°C for 0.5h-1h, then wash with water for 3-5 times, and finally dry in a vacuum drying oven at 100°C-105°C until absolutely dry .

[0033] In step 2, the para-aramid chopped fibers pretreated in step 1 are deflagged for the first time with a deflagging machine; then the meta-aramid pulp fibers are added for the second deflaking; finally, the dispersant is added to carry out The third time of thawing, the suspension was obtained;

[0034] The mass ratio of para-aramid chopped fibers to meta-aramid pulp fibers is 4:6, the dispersant is po...

Embodiment 1

[0043] The para-aramid chopped fiber is pretreated, and the pretreatment process is: the para-aramid chopped fiber is prepared at a molar concentration of 1.0×10 -3mol / L, temperature of 40 ℃ sodium dodecylbenzene sulfonate solution soaked for 0.5h, then washed 3 times, and finally dried in a vacuum oven at 100 ℃ to absolute dryness; weighed 1.27g pretreated absolute Dry para-aramid short-cut fiber, flaking 15000r in a deflaking machine, the deflaking concentration is controlled at 0.3% by mass, then add 1.90g of absolute dry meta-aramid pulp for deflaking, flaking for 15000r, and the deflaking concentration is controlled at 0.3% by mass %, and finally add 0.05% polyethylene oxide solution relative to the absolute dry mass of para-aramid chopped fibers and meta-aramid pulp fibers for flaking, flaking for 15000r, and controlling the flaking concentration at 0.3% by mass to obtain a suspension , inject the resulting suspension into the sheet former, and prepare a quantitative 100...

Embodiment 2

[0045] The para-aramid chopped fiber is pretreated, and the pretreatment process is: the para-aramid chopped fiber has a molar concentration of 3.0×10 -3 mol / L, soaked in sodium dodecylbenzenesulfonate solution at 60°C for 1 hour, then washed with water for 5 times, and finally dried in a vacuum oven at 105°C to absolute dryness; weighed 1.27g of pretreated absolute dryness For the para-aramid chopped fibers, deflate 25000r in the deflaking machine, and the deflaking concentration is controlled at 0.3% by mass, and then add 1.90g of absolute dry meta-aramid pulp for deflaking, deflaking for 25000r, and the deflaking concentration is controlled at 0.3% by mass , and finally add 0.07% polyoxyethylene solution relative to the absolute dry mass of para-aramid chopped fibers and meta-aramid pulp fibers for flaking, flaking for 25000r, and controlling the flaking concentration at 0.3% by mass to obtain a suspension. The resulting suspension is injected into a sheet former to prepare...

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Abstract

The invention discloses a preparation method of a para/meta aramid composite paper. The method specifically comprises the steps of: pretreating para-aramid chopped fiber; conducting first untwining on the pretreated para-aramid chopped fiber by a dfibizer; then adding meta-aramid pulp fiber to conduct second untwining; finally adding a dispersant to conduct third untwining to obtain a suspension; injecting the obtained suspension into a paper sheet former to conduct dehydration forming, and carrying out squeezing and drying treatment to obtain aramid composite paper raw paper; and conducting hot press molding on the obtained aramid composite paper, thus obtaining the product. The preparation method of the aramid composite paper provided by the invention can maximumly utilize the high strength properties of chopped fiber to improve the strength properties of meta-aramid paper.

Description

technical field [0001] The invention belongs to the cross technical field of papermaking industry and material industry, and relates to a preparation method of para-position / meta-aramid composite paper. Background technique [0002] Sheet-shaped composite material made of meta-aramid (poly-m-phenylene isophthalamide) pulp fiber and meta-aramid chopped fiber as raw materials, using modern papermaking wet papermaking technology and hot pressing , is a high-performance synthetic fiber paper-based material. Because of its tough mechanical properties, good dielectric properties, ideal high temperature resistance and flexible designability, it can be used as insulating materials, electronic materials, and structural materials in special fields such as aerospace, transportation, power, and national defense. application. [0003] At present, the localization of meta-aramid paper-based materials is still facing many difficulties, including the quality of raw materials, fiber disper...

Claims

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Application Information

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IPC IPC(8): D21H13/26D21H15/02D21F11/00D21C9/00D21H21/10D21H17/53
CPCD21C9/00D21F11/00D21H13/26D21H15/02D21H17/53D21H21/10
Inventor 张素风李鹏辉刘媛
Owner SHAANXI UNIV OF SCI & TECH
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