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A kind of preparation method of aramid nanofiber/mica composite insulating paper

A technology of nanofiber and composite insulation, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, papermaking, etc., which can solve the problem of weak interface between mica and fiber, large difference between the two sides of paper, and mechanical strength. Low-level problems, to achieve the effect of high mechanical strength, small difference between the two sides of the paper, and good compatibility

Active Publication Date: 2022-01-14
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The biggest problem is: (1) The particle size of mica is limited by the impact of performance (2) The interface between mica and fiber is weak, and the mechanical strength is low (3) The dielectric strength is low due to the free accumulation and distribution of mica and the pore size (4 ) The difference between the two sides of the finished paper is large, and the evenness is low

Method used

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  • A kind of preparation method of aramid nanofiber/mica composite insulating paper
  • A kind of preparation method of aramid nanofiber/mica composite insulating paper
  • A kind of preparation method of aramid nanofiber/mica composite insulating paper

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preparation example Construction

[0031] (1) Preparation of aramid nanofiber suspension: wash para-aramid chopped fibers with sodium dodecylbenzenesulfonate (LAS) hot water to obtain pretreated aramid fibers; Chopped fiber, potassium hydroxide, and dimethyl sulfoxide are placed in the container at the same time, and the mechanical stirring is continued after sealing to obtain the aramid nanofiber dispersion A that is stably dispersed in the KOH / DMSO system;

[0032] 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; sealed Under certain conditions, the magnetic stirrer is used to stir at room temperature for 5 to 7 days, and the rotation speed is 550 to 850 rpm.

[0033] (2) The mica flakes were ultrasonically treated and dispersed in deionized water, and prepared into a mica suspension under the action of mechanical...

Embodiment 1

[0046] A method for preparing aramid nanofiber / mica composite insulating paper in this embodiment, the specific preparation steps are as follows:

[0047] (1) Preparation of aramid nanofiber suspension: the p-aramid chopped fiber was passed through the solution containing sodium dodecylbenzenesulfonate (LAS) at a concentration of 1.2×10 -3 mol / L hot water washing treatment at 60°C to obtain pretreated aramid fibers; place the aramid fibers, potassium hydroxide, and dimethyl sulfoxide in a container at the ratio of 1g: 1.5g: 500ml at the same time, and seal Afterwards, continue the mechanical stirring treatment, and stir at room temperature at 550 rpm for 7 days to obtain the aramid nanofiber dispersion A that is stably dispersed in the KOH / DMSO system;

[0048] (2) Disperse muscovite flakes with a size of 10-50 μm in a mass ratio of aramid nanofibers to mica flakes at a mass ratio of 1:9, and then disperse them in deionized water under the action of mechanical stirring to make...

Embodiment 2

[0055] A method for preparing aramid nanofiber / mica composite insulating paper in this embodiment, the specific preparation steps are as follows:

[0056] (1) Preparation of aramid nanofiber suspension: 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 pretreated aramid fibers; place the aramid fibers, potassium hydroxide, and dimethyl sulfoxide in a container at the ratio of 1g: 1.5g: 500ml at the same time, and seal Afterwards, continue the mechanical stirring process, and stir at room temperature for 5.5 days at a rotating speed of 800rpm to obtain the aramid nanofiber dispersion A that is stably dispersed in the KOH / DMSO system;

[0057] (2) After the muscovite flakes with a size of 150-200 μm are treated by 1000W ultrasonic dispersion for 30 minutes according to the mass ratio of aramid nanofibers and mica flakes at a mass ratio of 2:8, they are dispersed in de...

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Abstract

The invention discloses a preparation method of aramid nanofiber / mica composite insulating paper, aiming at deprotonating macroscopic aramid fibers into aramid nanofibers, and then using an in-situ deposition method to realize aramid nanofibers on mica The self-forming film coating and interfacial strengthening effect realize the wide adaptability of mica particle size, and the uniformity, mechanical strength and dielectric strength are much higher than the performance of ordinary aramid mica insulating paper, which solves the problem of existing aramid mica insulation paper. In the process of paper wet papermaking: (1) mica particle size is limited by performance, (2) low mechanical strength, (3) free accumulation and distribution of mica produce voids and pore sizes, resulting in low dielectric strength, (4) both sides of paper There are many problems and defects such as large difference and low uniformity, and the operation is simple and the effect is remarkable, which provides a new method for the preparation of higher performance motor insulation materials.

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 / mica composite insulation paper. Background technique [0002] Electrical insulating materials are important materials in modern electrical equipment, and are widely used in aerospace, rail transportation and other fields. Aramid mica insulating paper is a widely used insulating material in large motors. The known aramid mica insulating paper is prepared by traditional wet papermaking technology, after mixing aramid fiber slurry and mica, forming, drying and hot pressing. The biggest problem is: (1) The particle size of mica is limited by the impact of performance (2) The interface between mica and fiber is weak, and the mechanical strength is low (3) The dielectric strength is low due to the free accumulation and distribution of mica and the pore size (4 ) The difference between the two sides...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/26D21H15/02D21H13/44D21J5/00
CPCD21H13/26D21H15/02D21H13/44D21J5/00
Inventor 张美云宋顺喜时宇杰袁世波杨斌谭蕉君聂景怡陆赵情
Owner SHAANXI UNIV OF SCI & TECH
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