High-performance aramid fiber insulating film and preparation method thereof

An insulating film, high-performance technology, applied in the direction of coating, etc., can solve the problems of low mechanical strength of insulating film, small intermolecular hydrogen bond force, insufficient electrothermal aging performance, etc., to reduce the dielectric breakdown of carriers Good effect of risk, polymer chain orientation, crystallinity, and thickness uniformity

Pending Publication Date: 2022-01-11
ZHUZHOU TIMES FIBER PIONEER MATERIAL TECH CO LTD
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  • Abstract
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Problems solved by technology

[0003] At present, there is only one Chinese patent CN201510944418.2 reporting a method for preparing an aramid insulating film. The characteristics of the method include: re-dissolving the polyaramid resin with a polar solvent and a co-solvent, and then casting it through flat glass, The above-mentioned aramid insulating film can be obtained by scraping, coating and drying. The preparation method is simple and easy to operate, but it has the following disadvantages. First, it needs to dissolve the resin again, which leads to waste of solvent; Residual metal salts of co-solvents can easily lead to insufficient electrothermal aging performance; third, polyaramid molecular chains have not been stretched and oriented, the hydrogen bond force between molecules is small, and the insulating film has defects of relatively low mechanical strength

Method used

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  • High-performance aramid fiber insulating film and preparation method thereof
  • High-performance aramid fiber insulating film and preparation method thereof

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Embodiment 1

[0037] A kind of preparation method of aramid fiber insulation film of the present invention, its technological process schematic diagram is as figure 1 shown, including the following steps:

[0038] (1) Under nitrogen protection system, dissolving m-phenylenediamine in N,N-dimethylacetamide containing lithium chloride, the quality of lithium chloride is 6.2% of that of N,N-dimethylacetamide %, to obtain a mixed solution, the temperature of the mixed solution is lowered to -15°C; according to the molar ratio of diamine to isophthaloyl chloride is 1:1.04, the mixed solution and molten isophthaloyl chloride are mixed and reacted at low temperature , to obtain an aramid resin solution containing hydrogen chloride, the solution has a copolymerized aramid resin content of 16.0%, and an inherent viscosity of 2.5;

[0039] (2) neutralizing the hydrogen chloride in the aramid resin solution after the step (1) by neutralizing agent lithium hydroxide to obtain the aramid film-forming s...

Embodiment 2

[0043] A kind of preparation method of aramid fiber insulation film of the present invention, its technological process schematic diagram is as figure 1 shown, including the following steps:

[0044] (1) Under the nitrogen protection system, p-phenylenediamine and 4,4'-diaminodiphenyl ether are dissolved in N,N-dimethylacetamide containing lithium chloride, and the quality of lithium chloride is 6.5% of the mass of N,N-dimethylacetamide to obtain a mixed solution, the temperature of the mixed solution was lowered to -15°C; ) to 2,5-dihydroxyterephthaloyl chloride in a molar ratio of 1:1.04, and the molar amount of 4,4'-diaminodiphenyl ether is equal to the molar amount of 2,5-dihydroxyterephthaloyl chloride 20% of 20%, the mixed solution and the molten isophthaloyl chloride are mixed and reacted at low temperature to obtain an aramid resin solution containing hydrogen chloride. The content of the copolymerized aramid resin in the solution is 15.0%, and the logarithmic viscosi...

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Abstract

The invention provides a preparation method of a high-performance aramid fiber insulating film, and belongs to the technical field of electrical insulating film materials. The preparation method comprises the following steps of (1) at a low temperature of-10 to-20 DEG C and under the protection of inert gas, dissolving a cosolvent, aromatic diamine and aromatic dicarbonyl chloride in an amide polar solvent in sequence for stirring and mixing reaction to obtain an aramid fiber resin solution; (2) neutralizing hydrogen chloride in the aramid fiber resin solution obtained in the (1) by using a neutralizing agent to obtain an aramid fiber film-forming stock solution; (3) performing high-temperature vacuum defoaming and filtering on the film-forming stock solution obtained in the (2), spraying the film-forming stock solution into a coagulating bath mixed solvent through a nozzle of a film making machine to form a film, and then performing hot water drafting, water washing, drying, hot press molding, cooling and rolling to obtain the aramid fiber insulating film. The aramid fiber film is compact in structure and excellent in thickness uniformity, and has better mechanical properties and electrical insulation properties.

Description

technical field [0001] The invention relates to the technical field of electrical insulating film materials, in particular to a high-performance aramid fiber insulating film and a preparation method thereof. Background technique [0002] Due to its excellent thermal stability, flame retardancy, electrical insulation, aging resistance, acid and alkali resistance, aromatic polyamide materials are widely used as high temperature resistant insulation materials in motors, transformers, cables and other high temperature resistant insulation fields. At present, the application of aromatic polyamide materials in the field of insulation mainly focuses on aramid insulating paper and its composite materials. Aramid insulating paper is generally obtained by blending aramid chopped fibers and aramid fibrids to obtain dispersed pulp. , and then obtained through online molding, dehydration, pressing, drying, and hot pressing. Because aramid pulp is difficult to fully disperse evenly durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/10B29C55/02B29C71/00B29C51/00B29C37/00C08J5/18C08L77/10
CPCB29C48/10B29C48/0018B29C48/0011B29C71/0009B29C37/0092C08J5/18C08J2377/10
Inventor 田宗芳黎勇宋欢杨军李正胜张明丁娉刘兴隆鲍时宽唐莹
Owner ZHUZHOU TIMES FIBER PIONEER MATERIAL TECH CO LTD
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