Corona-resistant aramid fiber/mica insulation paper and preparation method thereof

A technology of mica insulation and corona resistance, which is applied in the direction of plastic/resin/wax insulators, insulators, organic insulators, etc., can solve the problems of poor corona resistance and achieve good corona resistance, high production efficiency, and excellent dielectric properties intensity effect

Inactive Publication Date: 2022-03-22
SHAANXI UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0004] Aiming at the problem of poor corona resistance existing in existing aramid paper, the present invention provides a corona-resistant aramid / mica insulating paper and a preparation method thereof, by adding high-temperature-resistant and corona-resistant muscovite sheets During the manufacturing process of aramid paper, the corona resistance of aramid paper has been greatly improved, avoiding the problem of easy aging of aramid paper due to repeated electric shocks under high temperature and high pressure, and satisfying the application of equipment for insulation with a long life cycle Require

Method used

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  • Corona-resistant aramid fiber/mica insulation paper and preparation method thereof
  • Corona-resistant aramid fiber/mica insulation paper and preparation method thereof
  • Corona-resistant aramid fiber/mica insulation paper and preparation method thereof

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preparation example Construction

[0034] Based on the above ideas, the invention provides a method for preparing a corona-resistant aramid fiber / mica insulating paper, comprising the following steps:

[0035] Step 1, use a concentration of (1×10 -3 -1.5×10 -3 ) mol / L sodium dodecylbenzene sulfonate solution at 40-65°C for 30-90 minutes to wash aramid chopped fibers, then rinse and dry for later use. The aramid fibrids are refined through a refiner (PFI), sealed and stored for later use.

[0036]Step 2. Decompose the aramid chopped fibers in 2L of water with a fiber decomposer at a rotation speed of 10,000-25,000. Add the dispersant polyethylene oxide (PEO) when decomposing, but it is necessary to prepare 0.5706g / l PEO in advance. Ethylene solution, usually 100-1000ml solution is prepared, magnetically stirred and dispersed for 2-3 hours, placed in a volumetric flask, and a certain amount is added each time when dispersing the fibers, and then the aramid precipitated fiber obtained in step 1 is added, and the...

Embodiment 1

[0043] A kind of preparation method of corona-resistant aramid fiber / mica insulating paper of the present invention comprises the following steps,

[0044] Step 1, use a concentration of 1×10 -3 The mol / L sodium dodecylbenzenesulfonate solution washed the meta-aramid chopped fibers at 40°C for 30 minutes, then rinsed them and dried them for later use. The meta-aramid fibrids are refined through a refiner (PFI), and sealed for later use.

[0045] Step 2, 0.60g meta-aramid chopped fibers are decomposed in 2L of water for 25000 turns, adding muscovite sheets, aramid chopped fibers and aramid precipitated fiber gross mass 0.9% polyethylene oxide dispersant ( PEO), and then add 1.39g of meta-aramid fibrids, and disperse 8000 revolutions together with aramid chopped fibers. Then add muscovite flakes (the mass of muscovite flakes is 30% of the total mass of muscovite flakes, aramid chopped fibers and aramid fibrids), and mix and defrost for 2000 rpm to form a uniformly dispersed mi...

Embodiment 2

[0052] A kind of preparation method of corona-resistant aramid fiber / mica insulating paper of the present invention comprises the following steps,

[0053] Step 1, use a concentration of 1.2×10 -3 The mol / L sodium dodecylbenzenesulfonate solution washed the meta-aramid chopped fibers at 60°C for 40 minutes, then rinsed them and dried them for later use. The meta-aramid fibrids are refined through a refiner (PFI), and sealed for later use.

[0054] Step 2, 0.51g meta-aramid chopped fibers are decomposed in 2L of water for 15000 turns, adding muscovite sheets, aramid chopped fibers and aramid precipitated fiber gross mass 0.3% polyethylene oxide dispersant ( PEO), then add 1.19g of meta-aramid fibrids, and disperse with aramid chopped fibers for 10,000 revolutions. Then add muscovite flakes (the mass of muscovite flakes is 40% of the total mass of muscovite flakes, aramid chopped fibers and aramid fibrids), and mix and decompose at 2500 rpm to form a uniformly dispersed mixed ...

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Abstract

The invention provides corona-resistant aramid fiber/mica insulation paper and a preparation method of the corona-resistant aramid fiber/mica insulation paper. The preparation method comprises the following steps: 1, defibering aramid chopped fibers, polyoxyethylene and water, and then adding aramid fibrid for defibering to obtain first slurry; 2, muscovite slices are added into the first slurry for defibering, second slurry is obtained, and the total mass ratio of the aramid chopped fibers, the aramid fibrids and the muscovite slices in the second slurry is 0.04%-0.07%; and step 3, sequentially performing dehydration forming, squeezing, drying and hot pressing on the second slurry to obtain the aramid fiber/mica insulation paper. The high-temperature-resistant and corona-resistant white mica sheets are added into the manufacturing process of the aramid paper, so that the corona resistance of the aramid paper is greatly improved, the problem that the aramid paper is easy to age due to repeated electric shock under high temperature and high pressure is solved, and the application requirement of equipment for long insulation life cycle is met.

Description

technical field [0001] The invention relates to the technical fields of papermaking and insulating material preparation, in particular to a corona-resistant aramid fiber / mica insulating paper and a preparation method thereof. Background technique [0002] Mica is a silicate mineral with sheet structure in nature. Because of its excellent high temperature resistance, insulation performance and chemical stability, it is widely used in insulation, building materials, cosmetics, light industry, transportation, aviation and other fields. . Among them, muscovite is the most widely used because of its excellent insulation, stability, and large output. Mica paper is a flake material made of mica scales by wet method, but because the mica scales are lapped by electrostatic force and van der Waals force, the strength and interface bonding performance of pure mica paper are poor, so mica Products often need to add various adhesives and reinforcing materials to improve the mechanical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26D21H13/44D21H15/02D21H17/53D21F11/00D21F3/02D21H27/12H01B3/52
CPCD21H13/26D21H13/44D21H15/02D21H17/53D21F11/00D21F3/02H01B3/52
Inventor 陆赵情杨凯伦闫宁贾峰峰张雨婷马秦高坤花莉
Owner SHAANXI UNIV OF SCI & TECH
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