Para-aramid paper and preparation method thereof

A technology of para-aramid paper and para-aramid fiber, which is applied in the field of papermaking, can solve the problem of affecting the bonding properties of aramid fibers, the insulating strength of aramid paper, the decrease in breaking strength and breaking strength of aramid fibers, and the inability to fully reflect the high fiber strength, High mold and other problems, to achieve the effect of promoting development, reducing paper gaps, and filling paper gaps

Active Publication Date: 2014-11-05
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The flocculation of aramid fiber in water medium is very severe and not easy to disperse, which will have a negative impact on the formation of paper and the performance of the paper; and the para-aramid paper is also due to the rigid structure of the molecular chain of the aramid fiber and the chemical inertness of the fiber surface. , the lack of effective combination between fibers cannot fully reflect the characteristics of high strength and high modulus of the fiber itself
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 impact is due to the fact that the bonding fiber Thermal shrinkage under hot-pressing conditions causes gaps 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, due to the different properties of the binder fibers, it will affect the temperature resistance of the paper
The use of ultrasonic treatment will reduce the breaking strength and breaking strength of the aramid fiber itself, which will affect the performance of the paper.

Method used

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  • Para-aramid paper and preparation method thereof

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Effect test

preparation example Construction

[0022] The preparation method of para-aramid fiber paper of the present invention, as figure 1 As shown, specifically follow the steps below:

[0023] Step 1: Use volume-molar concentration of aramid chopped fiber to be 1.5×10 -3 ~3.0×10 -3 mol / L, the temperature is 40 ~ 90 ℃ sodium dodecylbenzene sulfonate aqueous solution for washing pretreatment, and then washed with water for later use.

[0024] Step 2: Thinning the washed and pretreated para-aramid chopped fibers with a trough beater to make a slurry (A).

[0025] 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 prepare a slurry (B).

[0026] Step 4: Sieve and select the para-aramid pulp fiber to obtain a pulp component with a mesh number of 50-100, and mix two kinds of pulp with different mesh numbers to prepare a slurry (C).

[0027] Step 5: Add the slurries (A), (B), and (C) into the slurry mixing tank according to the wei...

Embodiment 1

[0029] The volume-molar concentration of aramid chopped fiber is 2×10 -3mol / L, the temperature is 60 ℃ sodium dodecylbenzene sulfonate aqueous solution for washing pretreatment, and then washed with water for later use; Decompose, make slurry (A); Utilize the para-aramid pulp fiber to carry out beating treatment with the trough beater, beating degree is controlled at 35 ° SR, make slurry (B); Make the para-aramid pulp fiber Sieve and select the slurry components with 50-100 mesh numbers, mix two kinds of slurry with different mesh numbers to make slurry (C); prepare 20 parts by weight of slurry (A) (hereinafter referred to as parts), slurry (B) 70 parts and 10 parts of (C) are added to the slurry mixing kettle: after adding polyethylene oxide equivalent to 0.6% of the weight of para-aramid dry fiber, the slurry is mixed and the slurry concentration is adjusted to 0.10%. The good pulp is formed on the inclined wire paper machine, pressed under the pressure of 2-5MPa for 1-5min...

Embodiment 2

[0031] The volume-molar concentration of aramid chopped fiber is 1.5×10 -3 mol / L, the temperature is 70 ℃ sodium dodecylbenzene sulfonate aqueous solution for washing pretreatment, and then washed with water for later use; Slurry (A) is obtained by thawing; the para-aramid pulp fiber is subjected to beating treatment with a trough beater, and the beating degree is controlled at 45°SR to make a slurry (B); the para-aramid pulp fiber is screened Select the slurry components of 50-100 mesh, mix two kinds of slurry with different mesh to make slurry (C); prepare slurry (A) 30 (parts by weight, hereinafter referred to as part), slurry (B) 50 Parts, (C) 20 parts are added to the pulping kettle: add polyethylene oxide equivalent to 1.0% of the weight of para-aramid absolute dry fiber, mix the pulp and adjust the pulp concentration to 0.08% of the pulp suspension, and prepare the The slurry is formed on the inclined wire paper machine, pressed for 1-5 minutes at a pressure of 2-5 MPa...

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Abstract

The invention discloses Para-aramid paper and a preparation method thereof. By adding Para-aramid pulp size, sieved and selected from pulp fiber, of 50-100 meshes to form mixed size, fiber length and width distribution span of aramid pulp fiber is reduced, and obtained pulp fiber is concentrated in length distribution and width distribution, and have larger specific surface area. When the obtained pulp fiber is used with chopped fiber for papermaking with pulp, the obtained pulp fiber can be served as filler to combine with the chopped fiber better, paper sheet gap is filled, combination of fiber after hot pressing is tighter, combination of fiber is enhanced, paper sheet gap is reduced, evenness of finished paper is increased evidently, mechanical strength and compression strength of aramid paper are improved, paper breaking during papermaking is reduced, speed of a paper machine is increased, production efficiency is improved, and adverse effects to paper sheet performance due to introduction of a third binding fiber is avoided.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a para-aramid paper, 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, excellent dielectric properties,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/26
Inventor 张美云杨斌陆赵情刘毅娟刘俊华
Owner SHAANXI UNIV OF SCI & TECH
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