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Preparation method of polyester/para-position/meta-position aramid composite electric insulating paper

A technology of electrical insulation and composite paper, applied in plastic/resin/wax insulator, synthetic cellulose/non-cellulose material pulp/paper, special paper, etc., can solve the problem of poor insulation performance of paper, parchment, aramid paper machinery The problem of poor strength performance, etc., can achieve the effects of improved paper tightness, improved compressive strength, and regular and orderly arrangement of molecular chains.

Inactive Publication Date: 2016-11-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formed meta-aramid paper has poor mechanical strength, and the parchment phenomenon is serious, and the insulation performance of the paper is poor

Method used

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  • Preparation method of polyester/para-position/meta-position aramid composite electric insulating paper
  • Preparation method of polyester/para-position/meta-position aramid composite electric insulating paper
  • Preparation method of polyester/para-position/meta-position aramid composite electric insulating paper

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preparation example Construction

[0030] A kind of preparation method of polyester / para-position / meta-aramid composite electrical insulation paper of the present invention, specifically comprises the following steps:

[0031] Step 1, carry out pretreatment to PET chopped fiber, standby;

[0032] The pretreatment process of PET chopped fibers is: make PET chopped fibers 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 .

[0033] Step 2, pretreating PPTA chopped fibers;

[0034] The pretreatment process of PPTA chopped fibers is as follows: the PPTA 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 ...

Embodiment 1

[0046] The PET chopped fibers are pretreated, the pretreatment process is: the PET chopped fibers at a molar concentration of 1.0×10 -3 mol / L, sodium dodecylbenzenesulfonate solution at a temperature of 40°C for 0.5h, then washed three times with water, and finally dried in a vacuum oven at 100°C to dryness for later use; PPTA chopped fibers were pre-treated Treatment, the pretreatment process is: the molar concentration of PPTA chopped fiber is 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 PET short-cut fibers and PPTA short-cut fibers are decomposed in a deflagging machine for 15000r, and the de-flaking concentration is controlled at 0.3% by mass (the total mass of absolute dry PET short-cut fibers and PPTA short-cut fibers is 1.27g), wherein the absolute-dry PET The mass ratio of chopped fiber to PPTA c...

Embodiment 2

[0048] Carry out pretreatment to PET short-cut fiber, pretreatment process is: the molar concentration of PET short-cut fiber 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 drying oven at 105°C until completely dry, and set aside; PPTA chopped fibers were pretreated , the pretreatment process is: the molar concentration of PPTA 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 PET short-cut fiber and PPTA short-cut fiber, 25000r in deflagging machine, deflaking concentration is controlled at 0.3% by mass (the total mass of dry PET short-cut fiber and PPTA short-cut fiber is 1.27g), wherein dry PET short-cut The mass ratio of cut fiber to PPTA chopped fiber is 3:1, then we...

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Abstract

The invention discloses a preparation method of polyester / para-position / meta-position aramid composite electric insulating paper. The preparation method specifically comprises the following steps: pre-treating PET (Polyethylene Terephthalate) chopped fibers for later use; pre-treating PPTA (Poly(p-phenylene terephthalamide)) chopped fibers; mixing the pre-treated PET chopped fibers and the pre-treated PPTA chopped fibers and carrying out first time of defibering in a defibering machine; then, adding PMIA (Poly(m-phenyleneisophthalamide)) pulp fibers and carrying out second time of defibering; finally, adding a dispersant and carrying out third time of defibering to obtain suspending liquid; injecting the obtained suspending liquid into a paper molding device and dehydrating and molding; squeezing and drying to obtain aramid composite paper raw paper; and carrying out hot press molding on the aramid composite paper raw paper to obtain the aramid composite paper. According to the preparation method of the aramid composite paper, disclosed by the invention, the high-strength property of the chopped fibers can be utilized to the greatest extent and polyester fibers have a relatively low softening temprature so that the strength property and the dielectric property of the aramid paper are improved.

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 polyester / para-position / meta-aramid composite 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 mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/12D21H15/10D21H13/20
CPCD21H27/00D21H13/20D21H15/10
Inventor 张素风李鹏辉刘媛
Owner SHAANXI UNIV OF SCI & TECH
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