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Preparation method of high-density aramid insulating hardboard

A technology of insulating cardboard and cardboard, which is applied in papermaking, papermaking machines, textiles and papermaking, etc., can solve the problems of few research reports, high strength and high difficulty of aramid fibers, reduce production costs, protect the ecological environment, and improve reliability. compressibility effect

Active Publication Date: 2017-01-04
YANTAI METASTAR SPECIAL PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] With the development of science and technology, motors, transformers and other equipment are developing in the direction of miniaturization, large capacity, safety and reliability, and the demand for high-density insulating cardboard with a density of 1.1-1.2g / cc in practical applications is gradually increasing , but there are few related research reports
The existing products on the market are generally prepared by high temperature and high pressure treatment. Due to the high strength of the aramid fiber body, it is extremely difficult to mechanically compress it into high-density cardboard, which not only consumes a lot of resources, but also has high production costs. low precision

Method used

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  • Preparation method of high-density aramid insulating hardboard
  • Preparation method of high-density aramid insulating hardboard

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preparation example Construction

[0038] A method for preparing high-density aramid insulating cardboard, characterized in that the aramid insulating cardboard has a thickness of 1.0-10mm and a density of 1.1-1.2g / cc, comprising the following steps:

[0039](1) In terms of mass fraction, 20-60% meta-aramid chopped fibers, 20-60% meta-aramid fibrids and 20-40% meta-aramid pulp are mixed in water after dissolving, and the middle The meta-aramid fibrid fiber passes through multi-stage screening, and the size combination mass ratio of the meta-aramid fibrid fiber is ≤30 mesh: 30~50 mesh: 50~100 mesh: 100~150 mesh=0~2:1 ~3:3~7:1~5, meta-aramid pulp is made by mechanically cutting aramid paper, aramid waste silk and aramid scraps, and then hydraulic beating. The average length is 0.1-0.4mm. And the meta-aramid pulp is treated with low-temperature plasma, the processing power is 70-120W, the pressure is 50-100Pa, and the surface O / C ratio of meta-aramid pulp is 150-250% after low-temperature plasma treatment;

[004...

Embodiment 1

[0048] Select meta-aramid chopped fibers with a relative absolute total mass of 60%, meta-aramid fibrid fibers with a relative absolute total mass of 20%, and meta-aramid pulp with a relative absolute total mass of 20% to be fluffed in water; Among them, the meso-aramid fibrids are sieved in multiple stages and combined according to the size of ≤30 mesh: 30-50 mesh: 50-100 mesh: 100-150 mesh=0:1:7:2; Aramid pulp is made by mechanically cutting aramid paper, aramid waste silk, aramid scraps, etc., and then hydraulic beating. The average length is 0.4mm. It is treated with low-temperature plasma, with a power of 70W and a pressure of 50Pa. Make the surface O / C ratio reach 150%; mix the fiber slurry evenly, use the inclined wire former to carry out wet copy forming, the concentration of the netting is 0.005%, and use ultrasonic treatment in the former with a frequency of 50kHz; press and dry in the aromatic The surface of the fiber paper is coated with a layer of pure meta-aramid...

Embodiment 2

[0050] Select meta-aramid chopped fibers with a relative absolute total mass of 20%, meta-aramid fibrid fibers with a relative absolute total mass of 60%, and meta-aramid pulp with a relative absolute total mass of 20% to be fluffed in water; Among them, after the meta-aramid fibrids are screened in multiple stages, they are combined according to the size of ≤30 mesh: 30-50 mesh: 50-100 mesh: 100-150 mesh=2:3:4:1; Aramid pulp is made by mechanically cutting aramid paper, aramid waste silk, aramid scraps, etc., and then hydraulic beating. The average length is 0.3mmmm. It is treated with low-temperature plasma, with a power of 90W and a pressure of 80Pa. Make the surface O / C ratio reach 200%; mix the fiber slurry evenly, use the inclined wire former to carry out wet copying forming, the online concentration is 0.005%, and use ultrasonic treatment in the forming device with a frequency of 80kHz; press and dry in the aromatic The surface of the fiber paper is coated with a layer ...

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Abstract

The invention discloses a preparation method of a high-density aramid insulating hardboard. The preparation method comprises the following steps: defibering meta-aramid chopped fibers, meta-aramid precipitation fibers and meta-aramid paper pulp in water respectively; after mixing, carrying out wet-process papermaking and forming by utilizing an inclined-wire forming device; carrying out ultrasonic treatment in the forming device; after squeezing and drying, carrying out surface coating treatment; reeling a wet paper web through a laminated layer; after chopping off, spreading on a conveyor to form a wet paper blank; conveying the wet paper blank into a plate type hot press through a feeding trolley and carrying out subsection hot pressing; after cooling, unloading a board, conveying the board into a semi-finished product chamber and carrying out balance treatment; trimming and finishing to finally obtain a high-density aramid insulating hardboard product. The high-density aramid insulating hardboard prepared by the invention is composed of pure meta-aramid fibers, the thickness is 1.0mm to 10mm and the density is 1.1g / cc to 1.2g / cc; the size precision is high; the product has excellent mechanical strength and dielectric property, has high temprature-resisting grade and has good compatibility on oil and paint; the product can be widely applied to power equipment including motors, transformers and the like.

Description

technical field [0001] The invention belongs to the intersection field of papermaking industry and insulation industry, and specifically relates to a preparation method of high-density aramid fiber insulating cardboard. Background technique [0002] Aramid insulating paperboard is a high-performance insulating material prepared with meta-aramid fiber as the main raw material through wet sheeting and laminate pressing. Because of its outstanding mechanical strength, insulation properties and high temperature resistance, and good permeability and compatibility to oil and paint, it can be used as gaskets, end rings, stays, angle rings, bolts, screws, pressure rings Formed parts such as insulating cylinders and some structural parts of oil-immersed equipment are applied to electrical equipment such as motors and transformers, and the market prospect is very broad. [0003] Meta-aramid fiber has high strength, high modulus, excellent insulation and thermal stability, and is the ...

Claims

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Application Information

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IPC IPC(8): D21H15/02D21H13/26D21F11/02
CPCD21F11/02D21H13/26D21H15/02
Inventor 王志新江明邓钧波孙岩磊孙静鲍卫东李磊
Owner YANTAI METASTAR SPECIAL PAPER
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