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Para-aramid paper for honeycomb material and preparation method thereof

A technology of para-aramid paper and honeycomb material, applied in the field of papermaking, can solve the problems of affecting the bonding performance of aramid fibers, the insulating strength of aramid paper, improving the running and operating costs, affecting the temperature resistance of paper sheets, etc., achieving innovative Strengthen, promote development, and promote the effect of upgrading

Active Publication Date: 2014-10-29
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
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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-aramid paper for honeycomb 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, such as figure 1 As shown, implement the following steps:

[0025] Step 1: The molar concentration of aramid chopped fiber is 1.5×10 -3 ~3.0×10 -3 mol / L, the temperature is 40~90 ℃ sodium dodecyl benzene sulfonate aqueous solution for washing pretreatment, and then washed with water for use.

[0026] Step 2: Use a trough-type beater to decompose the washed para-aramid chopped fiber to obtain a slurry (A).

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

[0028] Step 4: Use a trough-type beater to dissolve the polyimide fiber, and the concentration of the polyimide fiber is controlled at 0.5-2% to prepare a slurry (C).

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

Embodiment 1

[0031] The aramid chopped fiber is used with a molar concentration of 2.3×10 -3 mol / L, the temperature is 60 ℃ sodium dodecyl benzene sulfonate aqueous solution for washing pretreatment, and then washed with water for use; use a trough beater to dissolve the pretreated para-aramid chopped fiber , Make a slurry (A); use a trough-type beater to beat the para-aramid pulp fiber, and control the beating degree at 36°SR to make a slurry (B); use a trough-type beater for the polyimide fiber The machine is used for decomposing, and the decomposing concentration is controlled at 0.5% to prepare slurry (C); 30 parts by weight of slurry (A), (hereinafter referred to as parts), 60 parts of slurry (B), and 10 parts (C) are added to the mixing kettle Medium: Add polyethylene oxide as a dispersant to mix and disperse the slurry and adjust the slurry concentration to 0.08% slurry suspension. The added dispersant mass is 0.6% relative to the mass of para-aramid fiber. The slurry is formed into ...

Embodiment 2

[0033] The aramid chopped fiber uses a molar concentration of 1.7×10 -3 mol / L, the temperature is 75 ℃ sodium dodecyl benzene sulfonate aqueous solution for washing pretreatment, and then washed with water for use; use a trough beater to dissolve the pretreated para-aramid chopped fiber Obtain the slurry (A); the para-aramid pulp fiber is beaten by a trough beater, and the beating degree is controlled at 42°SR to make a slurry (B); the polyimide fiber is processed by a trough beater Decompose, the decomposing concentration is controlled at 1.0% to make slurry (C); add 40 (parts by weight, hereinafter referred to as parts) of slurry (A), 40 parts of slurry (B), and 20 parts (C) into the slurry mixing kettle: Add polyethylene oxide as a dispersant to mix and disperse the slurry and adjust the slurry concentration to a slurry suspension of 0.12%. The mass of the added dispersant is 1.0% relative to the mass of the para-aramid fiber. The prepared slurry It is formed on an inclined ...

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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 specifically relates to a para-aramid paper for honeycomb materials. The invention also relates to a method for preparing the above-mentioned 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 are typical representatives 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. The slurry is obtained by dispersing the raw materials; 2. The slurry is formed on the Internet; 3. Dewatering, pressing, and drying; 4. High temperature calendering and forming. [0003] Because of its toug...

Claims

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Application Information

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Patent Type & Authority Patents(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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