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A preparation method of para-meta-aramid electrical insulating paper

An electrical insulation and para-aramid technology is applied in the field of preparation of para-meta-aramid electrical insulating paper, which can solve the problems of poor mechanical strength performance of aramid paper, poor paper dielectric performance, poor insulation performance and the like, To achieve the effect of regular and orderly arrangement of molecular chains, improved paper tightness, and improved strength properties

Active Publication Date: 2019-02-26
湖北城东再生资源科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The formed meta-aramid paper has poor mechanical strength, severe parchmentation, poor dielectric properties and poor insulation performance, which has become a bottleneck restricting the further application of aramid paper in the field of structural materials and insulating materials.

Method used

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  • A preparation method of para-meta-aramid electrical insulating paper
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preparation example Construction

[0029] A preparation method of the para-meta-aramid electrical insulating paper of the present invention specifically comprises the following steps:

[0030] Step 1, pretreating the para-aramid chopped fibers for subsequent use;

[0031] The pretreatment process of para-aramid chopped fibers is as follows: the para-aramid chopped fibers are mixed at a molar concentration of 1.0×10 - 3 mol / L~3×10 -3 mol / L, soak in sodium dodecylbenzenesulfonate solution at 40°C-60°C for 0.5h-1h, then wash with water for 3-5 times, and finally dry in a vacuum drying oven at 100°C-105°C until absolutely dry .

[0032] Step 2, pretreating the meta-aramid chopped fibers;

[0033] The pretreatment process of meta-aramid chopped fibers is as follows: the molar concentration of meta-aramid chopped fibers is 1.0×10 - 3 mol / L~3×10 -3 mol / L, soak in sodium dodecylbenzenesulfonate solution at 40°C-60°C for 0.5h-1h, then wash with water for 3-5 times, and finally dry in a vacuum drying oven at 100°C...

Embodiment 1

[0045] The para-aramid chopped fiber is pretreated, and the pretreatment process is: the para-aramid chopped fiber is prepared at a molar concentration of 1.0×10 -3 mol / L, soaked in sodium dodecylbenzenesulfonate solution at 40°C for 0.5h, then washed 3 times with water, and finally dried in a vacuum oven at 100°C to dryness for later use; The fiber is pretreated, and the pretreatment process is as follows: the meta-aramid chopped fiber is mixed at a molar concentration of 1.0×10 -3 mol / L, temperature of 40 ℃ sodium dodecylbenzene sulfonate solution soaked for 0.5h, then washed 3 times, and finally dried in a vacuum oven at 100 ℃ to absolute dryness; weighed 1.27g pretreated absolute Dry para-aramid chopped strands and meta-aramid chopped fibers are deflagged for 15000r in a deflagging machine, and the deflaking concentration is controlled at 0.3% by mass (absolutely dry para-aramid chopped fibers and meta-aramid chopped fibers The total mass is 1.27g), wherein the mass ratio...

Embodiment 2

[0047] The para-aramid chopped fiber is pretreated, and the pretreatment process is: the para-aramid chopped fiber has a molar concentration of 3.0×10 -3 mol / L, soaked in sodium dodecylbenzenesulfonate solution at 60°C for 1 hour, then washed with water for 5 times, and finally dried in a vacuum oven at 105°C until absolutely dry, and set aside; para-aramid chopped fibers Perform pretreatment, the pretreatment process is: the molar concentration of meta-aramid chopped fibers is 3.0×10 -3 mol / L, soaked in sodium dodecylbenzenesulfonate solution at 60°C for 1 hour, then washed with water for 5 times, and finally dried in a vacuum oven at 105°C to absolute dryness; weighed 1.27g of pretreated absolute dryness Para-aramid chopped fibers and meta-aramid chopped fibers are deflagged for 25000r in a deflagging machine, and the deflaking concentration is controlled at 0.3% by mass (the absolute dry para-aramid chopped fibers and meta-aramid chopped fibers Gross mass is 1.27g), wherei...

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Abstract

The invention discloses a preparation method of para-aramid and meta-aramid electrical insulation paper. The method comprises the following steps that para-aramid chopped fibers are preprocessed for use; meta-aramid chopped fibers are preprocessed; the preprocessed para-aramid chopped fibers and the preprocessed meta-aramid chopped fibers are mixed in a fluffer for primary defibering; then meta-aramid pulp fibers are added for secondary defibering; lastly, a dispersing agent is added for third defibering, and suspension liquid is obtained; the obtained suspension liquid is injected into a sheet forming device for dewatering forming, and body paper of the aramid electrical insulation paper is obtained after pressing and drying treatment; the obtained body paper of the aramid electrical insulation paper is subjected to hot press molding, and the aramid electrical insulation paper is obtained. According to the preparation method of the aramid electrical insulation paper, different ratios of the para-aramid chopped fibers to the meta-aramid chopped fibers are adopted, and the aramid electrical insulation paper with high strength and good dielectric properties is prepared.

Description

technical field [0001] The invention belongs to the cross technical field of papermaking industry and material industry, and relates to a preparation method of para-meta-aramid electrical insulating paper. Background technique [0002] Sheet-shaped composite material made of meta-aramid (poly-m-phenylene isophthalamide) pulp fiber and meta-aramid chopped fiber as raw materials, using modern papermaking wet papermaking technology and hot pressing , is a high-performance synthetic fiber paper-based material. Because of its tough mechanical properties, good dielectric properties, ideal high temperature resistance and flexible designability, it can be used as insulating materials, electronic materials, and structural materials in special fields such as aerospace, transportation, power, and national defense. application. [0003] The localization of meta-aramid paper-based materials is still facing many difficulties, including the quality of raw materials, fiber dispersion and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/12D21H13/20
CPCD21H13/20D21H27/00
Inventor 张素风李鹏辉刘媛
Owner 湖北城东再生资源科技发展有限公司
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