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Aramid fiber mica nano insulation paper and preparation method thereof
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A technology of insulating paper and mica, which is applied in the direction of special paper, insulators, organic insulators, etc. It can solve the problems of moisture resistance, chemical stability and insulation performance that cannot meet the requirements, and the mechanical performance and insulation performance of aramid mica paper need to be improved.
Active Publication Date: 2021-07-09
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology
Traditional insulating materials can no longer meet the requirements in terms of moisture resistance, temperature resistance, chemical stability and insulation performance. Aramid fibers have attracted much attention for their excellent high temperature resistance and chemical stability. Mica is introduced into aramid fiber preparation The aramid mica paper with excellent insulating properties has been extensively studied
However, the mechanical properties and insulating properties of the aramid mica paper prepared by the existing method need to be improved
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[0017] The invention provides a preparation method of aramid mica nano insulating paper, comprising the following steps:
[0018] mixing mica and urea by ball milling, washing and removing free urea in the obtained ball milling material, and dispersing the washed solid in water to obtain a mica nanosheet dispersion;
[0019] The aramid nanofiber dispersion is subjected to the first vacuum filtration, and after being drained, the mica nanosheet dispersion is added to the obtained solid, and the second vacuum filtration is performed, and the first vacuum filtration and the second vacuum filtration are repeated successively. The process of vacuum filtration is 2-100 times, and after drying, the aramid mica nano insulating paper is obtained.
[0020] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.
[0021] In the invention, mica and urea are ball milled and mixed, ...
Embodiment 1
[0038] Add 1.5g KOH and 500mL DMSO in 1g aramid fiber, after stirring for 7 days, obtain the red transparent aramid nanofiber / DMSO dispersion liquid, after adding 2000mL deionized water in the aramid nanofiber / DMSO dispersion liquid, all Quality 3min (rotating speed is 8000rpm), obtains the aramid fiber dispersion liquid that concentration is 0.4mg / mL;
[0039] 1g of mica, 9g of urea and 100g of agate ball milling beads are added to a planetary ball mill and ball milled for 36h at 500rpm, the resulting ball milling material is washed with deionized water to remove free urea in the ball milling material, and the solids after the gained washing are dispersed in a deionized In deionized water, a mica nanosheet dispersion with a concentration of 0.4 mg / mL was obtained;
[0040] Take 10mL of the aramid nanofiber dispersion and perform the first vacuum filtration in a vacuum filtration device. After drying, take 0.26mL of the mica nanosheet dispersion and dilute it to 10mL with deio...
Embodiment 2
[0042] The difference between this example and Example 1 is that the volume of the mica nanosheet dispersion is 0.53 mL, that is, the content of nano-mica in the aramid mica nano-insulation paper is 5 wt.%.
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Abstract
The invention provides aramid fiber mica nano insulation paper and a preparation method thereof, and belongs to the technical field of crossing of the papermaking industry and the insulation industry. The preparation method comprises the steps: carrying out solid-phase ball milling on a mixture of mica and urea to prepare surface amino-modified nano mica, and then assembling the surface amino-modified nano mica and aramid nano fibers into ordered nano paper in a gradual suction filtration manner, so as to obtain the aramid fiber mica nano insulation paper with ultrahigh insulation performance. The result of the embodiment shows that compared with an existing macroscopic paper-based material, the aramid fiber mica nano insulation paper prepared by the invention has higher mechanical strength and insulating property (dielectric breakdown strength); compared with a traditional suction filtration mode, the method has the advantages that an ordered structure is constructed in the aramid fiber mica nano insulation paper by adopting a multiple-step step-by-step suction filtration mode, a compact insulation layer can be formed in the material, and the insulation performance of the material is greatly improved.
Description
technical field [0001] The invention relates to the interdisciplinary technical field of papermaking industry and insulation industry, in particular to an aramid mica nano-insulation paper and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the economy and the advancement of science and technology, high-speed rail, as an important means of transportation, has gradually realized public transportation, and its traction motors have put forward higher requirements for the performance of insulating materials. Traditional insulating materials can no longer meet the requirements in terms of moisture resistance, temperature resistance, chemical stability and insulation performance. Aramid fibers have attracted much attention for their excellent high temperature resistance and chemical stability. Mica is introduced into aramid fiber preparation The aramid mica paper with excellent insulating properties has been extensively st...
Claims
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