Para-position aramid fiber paper used for cellular material and preparation method thereof

A technology of para-aramid paper and honeycomb materials, applied in pulp beating methods, synthetic cellulose/non-cellulose material pulp/paper, paper, etc., can solve the problem of affecting the bonding performance of aramid fibers and improve the insulation strength of aramid paper Problems such as running and operating costs, affecting the temperature resistance of paper sheets, etc., achieve the effect of strong innovation, promoting development, and promoting upgrading

Active Publication Date: 2013-01-30
SHAANXI UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

The method described in the above-mentioned patent is to add a third kind of bonding fiber with obvious melting temperature and para-aramid fiber to prepare and then heat-press the method to achieve the reinforcing effect. The negative effect is due to the fact that the bonding fiber Thermal shrinkage under hot pressing conditions causes voids and pinholes to be formed at the position of the original bonding fibers in the paper due to heat shrinkage, increasing the porosity of the paper, which will affect the bonding performance between the aramid fibers and the aramid paper. Insulation strength, at the same time, because of the different properties of the binder fibers, it will affect the heat resistance of the paper
However, by adding functional powders, it is necessary to consider the impact of multiple problems such as retention and pollution of the wet end environment, pipelines, etc., which will inevitably increase operating and operating costs.

Method used

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  • Para-position aramid fiber paper used for cellular material and preparation method thereof

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preparation example Construction

[0024] The preparation method of para-aramid paper for honeycomb material of the present invention, as figure 1 As shown, specifically follow the steps below:

[0025] Step 1: the mass molar concentration of aramid chopped fiber is 1.5×10 -3 ~3.0×10 -3 mol / L, sodium dodecylbenzenesulfonate aqueous solution at a temperature of 40~90°C for washing pretreatment, and then washed with water for later use.

[0026] Step 2: Thinning the washed para-aramid chopped fibers with a tank beater to obtain a slurry (A).

[0027] Step 3: The para-aramid pulp fiber is subjected to beating treatment with a trough beater, and the beating degree is controlled at 30-60°SR to make a slurry (B).

[0028] Step 4: The polyimide fiber is decomposed with a trough beater, and the decompression concentration is controlled at 0.5~2% to make a slurry (C).

[0029] Step 5: Add the slurries (A), (B), and (C) into the slurry mixing tank according to the stated weight parts, and add polyethylene oxide as a ...

Embodiment 1

[0031] The mass molar concentration of aramid chopped fiber is 2.3×10 -3 mol / L, sodium dodecylbenzenesulfonate aqueous solution at 60°C for washing and pretreatment, and then rinse with water for later use; use a trough beater to loosen the washed and pretreated para-aramid chopped fibers , made into slurry (A); the para-aramid pulp fiber was beaten by a trough beater, and the beating degree was controlled at 36°SR to make a slurry (B); the polyimide fiber was beaten by a trough The machine is used to decompose, and the decomposed concentration is controlled at 0.5% to make a slurry (C); 30 parts by weight of the slurry (A), (hereinafter referred to as parts), 60 parts of the slurry (B), and 10 parts of (C) are added to the slurry mixing kettle Middle: add polyethylene oxide as a dispersant to mix and disperse the slurry and adjust the slurry concentration to 0.08% of the slurry suspension. Slurry is formed on an inclined wire paper machine, pressed for 1-5 minutes under a pr...

Embodiment 2

[0033] The mass molar concentration of aramid chopped fiber is 1.7×10 -3 mol / L, sodium dodecylbenzene sulfonate aqueous solution at a temperature of 75°C for washing and pretreatment, and then washed with water for later use; use a tank beater to decompose the washed and pretreated para-aramid chopped fibers The slurry (A) is obtained; the para-aramid pulp fiber is beaten with a trough beater, and the beating degree is controlled at 42°SR to make a slurry (B); the polyimide fiber is processed with a trough beater Thawing, the concentration of the thinning is controlled at 1.0%, and the slurry (C) is made; add 40 (parts by weight, hereinafter referred to as parts) of the slurry (A), 40 parts of the slurry (B), and 20 parts of (C) into the slurry mixing kettle: Add polyethylene oxide as a dispersant to mix and disperse the slurry and adjust the slurry concentration to 0.12% of the slurry suspension. The quality of the added dispersant is 1.0% relative to the mass of the para-ara...

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Abstract

The invention discloses a para-position aramid fiber paper used for a cellular material and a preparation method thereof. The preparation process comprises the following steps: adding polyimide fibers, defibering and dispersing; papermaking together with para-position aramid fiber, wherein the papermaking proportion in parts by weight is as follows: 20-50% of para-position aramid short cut fiber, 35-60% of para-position aramid pulp fiber and 5-30% of polyimide fiber; and squeezing, drying and carrying out hot press moulding.. According to the preparation method, tear strength, temperature resistance and fire resistance of the para-position aramid fiber paper can be obviously improved, paper breaking during papermaking is reduced, operating speed of a paper machine and production efficiency are improved, and negative effects on properties of a paper sheet as a cohesive fiber such as a polyester fiber is introduced can be avoided.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a para-aramid paper for honeycomb materials, and also relates to a preparation method of the para-aramid paper. Background technique [0002] Para-aramid fiber (poly-p-phenylene terephthalamide) has excellent properties such as high specific strength, high specific modulus, high temperature resistance and flame retardancy, and has low relative density, fatigue resistance, shear resistance and size Good stability and other advantages, it is a typical representative of high-performance fibers. Para-aramid paper is prepared from para-aramid chopped strands and pulp fibers in a certain ratio through a wet papermaking process. The main process is: 1. Dispersing raw materials to obtain slurry; 2. Slurry forming on the net; 3. Dehydration, pressing, drying; 4. High temperature calendering treatment and forming. [0003] Due to its strong mechanical properties, excellen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26D21D1/02D21H21/08D21H17/53D21F3/00
Inventor 陆赵情杨斌张美云刘毅娟刘俊华
Owner SHAANXI UNIV OF SCI & TECH
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