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Para-aramid fiber and mica composite paper and production method thereof

A technology of para-aramid fiber and para-aramid fiber, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, paper, etc., which can solve the requirements of materials that are difficult to meet the insulation grade of C and above. , It is difficult to meet the problems of high-end field use, limited heat resistance of meta-aramid fibers, etc., to achieve excellent composite reinforcement effect, excellent liquid phase dispersion performance, and the effect of improving mechanical and dielectric strength.

Active Publication Date: 2016-05-11
YANTAI METASTAR SPECIAL PAPER
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Problems solved by technology

[0004] The above-mentioned patents all introduce the method of using meta-aramid fiber to reinforce mica paper, which improves the mechanical properties or dielectric strength of mica paper to a certain extent. However, due to the limited heat resistance of the meta-aramid fiber body, Its long-term use temperature is 200°C, and it is difficult to meet the requirements of C-class insulation grade and above materials, and it is difficult to meet the use in high-end fields

Method used

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  • Para-aramid fiber and mica composite paper and production method thereof
  • Para-aramid fiber and mica composite paper and production method thereof
  • Para-aramid fiber and mica composite paper and production method thereof

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preparation example Construction

[0031] (1) Preparation of mica flake slurry: air-select mica fragments, remove impurities such as air-dried mica, rusty mica, stained mica, and sawdust that are not suitable for copying, and further remove fine silt and other impurities through a pressure sieve, and then use a power of 800 ~ 3000W ultrasonic treatment for 1 ~ 10h, the mica fragments are peeled into mica flakes, and the mica flakes are prepared into a slurry with a mass concentration of 1% to 6%;

[0032] (2) Dispersion of para-aramid short-cut fibers: disperse para-aramid short-cut fibers with a length of 4 to 12 mm and a fineness of 2D in water, and add 0.3 to 1% of the dispersant poly Ethylene oxide solution, the mass concentration of the added polyoxyethylene solution is 0.03-0.10%, and the trough beater is used to fully decompose and disperse evenly to obtain para-aramid chopped fiber slurry, and the mass concentration of the slurry is 0.01-0.05%;

[0033] (3) Beating of the para-aramid fibrids: the para-a...

Embodiment 1

[0037] Embodiment 1 adopts the method of the present invention to prepare para-aramid fiber mica composite paper

[0038]Select muscovite fragments with a thickness ≤ 1.6mm, remove impurities through winnowing and pressure sieving, and use ultrasonic treatment to peel the muscovite fragments into mica flakes, with a power of 800W and a time of 10h, and prepare a slurry with a mass concentration of 1%. ; Use a trough-type beater to disperse the para-aramid chopped fibers with a length of 12mm and a fineness of 2D. Before dispersing, add 0.3% polyethylene oxide relative to the absolute dry mass, and the mass concentration of the polyethylene oxide solution is 0.03%. Aramid chopped fiber slurry, the mass concentration of the slurry is 0.01%; the para-aramid precipitated fiber is beaten by a disc refiner, the beating degree is 40°SR, and the length distribution is selected by a sieving instrument from 35 to 140 mesh pairs Para-aramid precipitated fiber, prepared into para-aramid p...

Embodiment 2

[0039] Embodiment 2 adopts the method of the present invention to prepare para-aramid fiber mica composite paper

[0040] Select muscovite fragments with a thickness ≤ 1.6mm, remove impurities through winnowing and pressure sieving, and use ultrasonic treatment to peel the muscovite fragments into mica flakes, with a power of 1500W and a time of 5h, and prepare a slurry with a mass concentration of 3%. ; Use a trough-type beater to disperse the para-aramid chopped fibers with a length of 6mm and a fineness of 2D. Before dispersing, add 0.5% polyethylene oxide relative to the absolute dry mass, and the mass concentration of the polyethylene oxide solution is 0.05%, and the para-aramid fiber is obtained. Aramid chopped fiber slurry, the slurry mass concentration is 0.03%; the para-aramid precipitated fiber is beaten with a disc refiner, the beating degree is 50°SR, and the length distribution of 35-140 mesh pairs is selected by a sieving instrument Para-aramid fibrid fiber, prep...

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Abstract

The invention relates to para-aramid fiber and mica composite paper and a production method thereof. The paper is prepared from 10%-20% of para-aramid chopped fiber, 20%-40% of para-aramid fibrid and 40%-70% of mica plates. The production method comprises the following steps: preparing mica plate pulp with mass concentration of 1%-6%, para-aramid chopped fiber pulp with mass concentration of 0.01%-0.05% and para-aramid fibrid pulp with mass concentration of 0.05%-0.5%, uniformly mixing and dispersing the pulp, shaping by wet papermaking, drying, and then hot-pressing to obtain the para-aramid fiber and mica composite paper. The composite paper is low in quantity, small in porosity and excellent in mechanical strength, the high temperature stability of the composite paper is remarkably improved while the mechanical strength and dielectric strength of the mica composite paper are guaranteed, and the preparation steps are simple.

Description

【Technical field】 [0001] The invention belongs to the field of insulating materials, and in particular relates to para-aramid fiber mica composite paper and a production method thereof. 【Background technique】 [0002] my country's mica minerals are rich in reserves, but the utilization rate of raw ore processing is low, resulting in a large amount of mica fragments and slag. The mica paper prepared by modern papermaking wet papermaking technology is non-toxic, tasteless, and corrosion-resistant. , aging resistance, excellent insulation performance and high temperature stability, it is the most ideal high temperature resistant insulation material in the world. 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] The current reinforcing method mainly uses aramid fiber as the ...

Claims

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Application Information

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IPC IPC(8): D21H15/12D21H13/26D21H13/44D21F11/00D21H25/04
CPCD21F11/00D21H13/26D21H13/44D21H15/12D21H25/04
Inventor 王志新江明孙静孙岩磊鲍卫东张峻华
Owner YANTAI METASTAR SPECIAL PAPER
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