Preparation method of aramid nanofiber self-reinforced aramid mica paper

A nanofiber and aramid fiber technology, which is applied in synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, papermaking, etc., can solve the problem of low retention rate of mica, limited improvement of mechanical strength and dielectric strength and other problems to achieve the effect of improving mica retention rate, improving dielectric strength and mechanical strength, and improving dielectric strength

Active Publication Date: 2019-09-06
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a preparation method of aramid nanofiber self-reinforced aramid mica paper, to overcome the low mica retention rate and the random stacking of large particle size mica in the existing aramid mica paper wet papermaking process. , Arbitrary build-up produces voids and pore diameters that cause limited mechanical strength and dielectric strength improvement. The invention makes the dielectric strength and mechanical strength of aramid mica paper significantly enhanced, and the insulation performance is significantly improved.

Method used

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  • Preparation method of aramid nanofiber self-reinforced aramid mica paper

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preparation example Construction

[0029] (1) Preparation of aramid nanofiber suspension. The para-aramid chopped fibers are washed with sodium dodecylbenzenesulfonate (LAS) hot water to obtain aramid fibers; the aramid fibers, potassium hydroxide, and dimethyl sulfoxide are placed in a container at the same time , continuous mechanical stirring after sealing, to obtain the aramid nanofiber dispersion A stably dispersed in the KOH / DMSO system;

[0030] Among them, the concentration of LAS is 1.2~1.5×10 -3 mol / L, hot water washing conditions are: temperature 60-80°C, mechanical stirring time 30-60min, ratio of para-aramid chopped fiber, potassium hydroxide, dimethyl sulfoxide is 1g:1.5g:500ml, continuous The specific requirements for mechanical stirring are: under sealed conditions, use a magnetic stirrer to stir at room temperature for 5 to 7 days, with a rotation speed of 550 to 850 rpm.

[0031] (2) Under continuous mechanical stirring, slowly inject deionized water into the above dispersion to obtain arami...

Embodiment 1

[0048] A method for preparing aramid nanofiber self-reinforced aramid mica paper in this embodiment, the specific preparation steps are as follows:

[0049] (1) Preparation of aramid nanofiber suspension. The p-aramid chopped fibers were treated with sodium dodecylbenzenesulfonate (LAS) at a concentration of 1.2×10 -3 mol / L hot water washing treatment at 60°C to obtain aramid fiber; put the aramid fiber, potassium hydroxide, and dimethyl sulfoxide in a container at the same time in a ratio of 1g: 1.5g: 500ml, seal and continue mechanical stirring , stirring at room temperature at 550 rpm for 7 days to obtain the aramid nanofiber dispersion A stably dispersed in the KOH / DMSO system;

[0050] (2) Under continuous mechanical stirring, slowly inject deionized water into the above-mentioned dispersion liquid, the mass ratio of deionized water and aramid fiber nanofiber dispersion liquid is 2:1, obtain the aramid fiber nanofiber dispersed in the aqueous phase system / KOH / DMSO / H 2...

Embodiment 2

[0058] A method for preparing aramid nanofiber self-reinforced aramid mica paper in this embodiment, the specific preparation steps are as follows:

[0059] (1) Preparation of aramid nanofiber suspension. The p-aramid chopped fibers were treated with sodium dodecylbenzenesulfonate (LAS) at a concentration of 1.5×10 -3 mol / L hot water washing treatment at 80°C to obtain aramid fiber; put the aramid fiber, potassium hydroxide, and dimethyl sulfoxide in a container at the same time in a ratio of 1g: 1.5g: 500ml, seal and continue mechanical stirring , stirring at room temperature at 850 rpm for 5.5 days to obtain the aramid nanofiber dispersion A stably dispersed in the KOH / DMSO system;

[0060] (2) Under continuous mechanical stirring, slowly inject deionized water into the above-mentioned dispersion liquid, the mass ratio of deionized water and aramid fiber nanofiber dispersion liquid is 5:1, and obtain the aramid fiber nanofiber dispersed in the aqueous phase system / KOH / DMS...

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Abstract

The invention discloses a preparation method of aramid nanofiber self-reinforced aramid mica paper. By means of the method, the retention rate of mica in the wet papermaking process of the aramid micapaper is increased, and the dielectric strength and mechanical strength of the aramid mica paper are further improved; the problems are solved that in the wet papermaking process of existing aramid mica paper, the retention rate of mica is low, and as large-particle-size mica is randomly stacked and arbitrarily accumulated, gaps and pores are generated and the improvement of mechanical strength and dielectric strength is limited; meanwhile, through simple operation of the method, the dielectric strength and mechanical strength of the aramid mica paper are significantly improved, and the insulating property is remarkably improved.

Description

technical field [0001] The invention belongs to the cross field of papermaking industry and insulation industry, and in particular relates to a preparation method of aramid nanofiber self-reinforced aramid mica paper. Background technique [0002] Electrical insulating materials are important materials in modern electrical equipment, and are widely used in traction motors, high-voltage power generation and transmission equipment, electrical appliances, home appliances, new energy and other fields. Aramid mica paper is widely used in the main insulation materials of large motors due to its good insulation properties, and is a widely used insulation material. Aramid mica paper is prepared from natural mineral mica and aramid fiber through wet papermaking and hot pressing. The mechanical strength is improved by adding aramid fiber, which solves the problem of poor bonding strength of pure mica paper, while retaining the insulation properties of the material. Chinese invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26D21H17/68
CPCD21H13/26D21H17/68
Inventor 宋顺喜时宇杰张美云袁世波杨斌谭蕉君聂景怡陆赵情
Owner SHAANXI UNIV OF SCI & TECH
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