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M-aramid fiber mica paper and preparation method thereof

A technology of aramid fiber and aramid fibril, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material treatment, paper, etc., which can solve the problem of easy lint and powder falling on the surface, low tear strength, Combining the problems of low strength to achieve the effect of improving mechanical strength and dielectric strength, excellent tensile strength, improving mechanical properties and dielectric strength

Active Publication Date: 2016-05-04
YANTAI METASTAR SPECIAL PAPER
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Problems solved by technology

[0004] The above-mentioned patent introduces the method of using meta-aramid fibers to reinforce mica paper, which improves the mechanical properties or dielectric strength of aramid paper to a certain extent. However, the meta-aramid fibers have a smooth surface and high inertness. The bonding of the mica paper is poor, and if the mica paper is simply reinforced with chopped fibers, the formation of the paper is poor, the bonding strength is low, and the surface is easy to lint and powder. The crack strength is extremely low, and it is difficult to meet the requirements of high-end fields.

Method used

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  • M-aramid fiber mica paper and preparation method thereof
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  • M-aramid fiber mica paper and preparation method thereof

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preparation example Construction

[0031] see figure 1 , the preparation method of mica paper of the present invention, comprises the following steps:

[0032] (1) Preparation of mica sheet slurry: winnowing muscovite fragments or sericite fragments, removing impurities such as air-dried mica, rust mica, stained mica and wood chips that are not suitable for copying, and further removing impurities such as fine silt through a pressure sieve, Then use ultrasonic treatment to peel off the mica sheet into mica sheet. The ultrasonic treatment conditions are: power 800-3000W, time 1-10h; Mesh: ≧40 mesh Grading ratio=(1~3):(4~6):3 The ratio is combined, and the mica sheet slurry with a mass concentration of 1~6% is prepared;

[0033] (2) Dispersion of meta-aramid short-cut fibers: disperse meta-aramid short-cut fibers with a length of 4-12 cm and a fineness of 2D in deionized water, and add a polyethylene oxide solution with a mass concentration of 0.03-0.08% Finally, use a trough beater to fully decompose and dispe...

Embodiment 1

[0038] Embodiment 1 adopts the method of the present invention to prepare meta-aramid fiber mica paper

[0039]Select muscovite fragments with a thickness ≤ 1.6mm, remove impurities through winnowing and pressure sieving, and use ultrasonic treatment to peel off the mica flakes into mica flakes, with a power of 800W and a time of 10h. Classify the particle size of the mica flakes through a sieve, combine them according to the ratio of ≦20 mesh: 20~40 mesh: ≧40 mesh particle size ratio = 1:6:3, and prepare a slurry with a mass concentration of 1%. ; Use a trough beater to disperse the length 12mm, the meta-aramid chopped fiber of the fineness 2D, add the polyethylene oxide (mass concentration is 0.03%) of relative absolute dry mass 0.3%, disperse and disperse and make the mass concentration be 0.01% Slurry; the aramid precipitated fiber is beaten by a disk refiner, the fiber length distribution is 35-140 mesh, the beating degree is 45°SR, and the slurry with a mass concentratio...

Embodiment 2

[0040] Embodiment 2 adopts the method of the present invention to prepare meta-aramid fiber mica paper

[0041] Select muscovite fragments with a thickness ≤ 1.6mm, remove impurities through winnowing and pressure sieving, and use ultrasonic treatment to peel off mica flakes into mica flakes, with a power of 1500W and a time of 4h. Classify the particle size of the mica flakes through a sieve, combine them according to the ratio of ≦20 mesh: 20~40 mesh: ≧40 mesh particle size ratio = 2:5:3, and prepare a slurry with a mass concentration of 3%. ; Use a trough beater to disperse the length 6mm, the meta-aramid chopped fiber of the fineness 2D, add the polyoxyethylene (mass concentration is 0.05%) of relative absolute dry mass 0.5%, disperse and disperse and make the mass concentration be 0.02% Slurry; the aramid precipitated fiber is beaten by a disc refiner, the fiber length distribution is 35-140 mesh, the beating degree is 55°SR, and the slurry is prepared with a mass concent...

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Abstract

The invention relates to an m-aramid fiber mica paper and a preparation method thereof. The preparation method comprises preparing mica sheet slurry and m-aramid chopped fiber slurry, mixing and dispersing the mica sheet slurry, the m-aramid chopped fiber slurry and m-aramid fibrid slurry to obtain a uniform mixture, wherein the mixture comprises, by mass, 60-80% of the mica sheets and 20-40% of the m-aramid chopped fiber slurry and the m-aramid fibrid slurry and a mass ratio of the m-aramid fibrids to the m-aramid chopped fibers is (4-2): 1, based on the total mass of the oven dry raw materials, adding 0.01-0.1% by mass of a cationic polyacrylamide solution into the mixture, carrying out mixing to obtain uniform paper slurry, carrying out wet paper making on the paper slurry, carrying out drying and carrying out hot pressing to obtain the m-aramid fiber mica paper. The method utilizes the m-aramid chopped fibers as framework materials for reinforcement and utilizes the m-aramid fibrids as binder materials, and in hot pressing, a main body produces melting deformation and the mica sheets and the m-aramid chopped fibers are firmly inserted into the main body so that mica paper mechanical strength and dielectric strength are improved.

Description

【Technical field】 [0001] The invention belongs to the intersection field of papermaking industry and insulation industry, and specifically relates to a meta-aramid fiber mica paper and a preparation method thereof. 【Background technique】 [0002] Mica paper is a paper-based insulating material prepared by modern paper-making wet papermaking with fine mica sheets as the main raw material. It is non-toxic, odorless, anti-corrosion, anti-aging, excellent insulation performance and high temperature stability. Ideal high temperature resistant insulating material. The formation of mica paper mainly depends on the van der Waals force and electrostatic force between the mica sheets, resulting in low mechanical strength of the paper, which is difficult to meet the use requirements and low production efficiency. [0003] In order to improve the performance of mica paper, experts and scholars have adopted different reinforcing materials and methods to strengthen mica paper, among whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/44D21H13/26
CPCD21H13/26D21H13/44
Inventor 孙茂健江明王志新孙岩磊张峻华刘建宁
Owner YANTAI METASTAR SPECIAL PAPER
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