A kind of preparation method of para-aramid fiber mica paper

A technology of para-aramid fiber and para-aramid fiber, which is applied in the directions of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, inorganic fiber/sheet, etc., which can solve the problem of difficulty in reaching C-class insulation grade and above. Material requirements, difficulty in meeting high-end applications, limited heat resistance of meta-aramid fibers, etc., to achieve excellent liquid phase dispersion properties and composite reinforcement effects, major market prospects and practical significance, and excellent mechanical strength.

Active Publication Date: 2017-10-03
YANTAI METASTAR SPECIAL PAPER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patents all introduce the method of using meta-aramid fiber to reinforce mica paper, which improves the mechanical properties or dielectric strength of mica paper to a certain extent. However, due to the limited heat resistance of the meta-aramid fiber body, Its long-term use temperature is 200°C, and it is difficult to meet the requirements of C-class insulation grade and above materials, and it is difficult to meet the use in high-end fields

Method used

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  • A kind of preparation method of para-aramid fiber mica paper
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  • A kind of preparation method of para-aramid fiber mica paper

Examples

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Embodiment 1

[0033] Example 1 Preparation of para-aramid fiber mica paper by the method of the present invention

[0034]Ultrasonic treatment is used to peel the muscovite flakes into mica flakes, the power is 800W, and the time is 10h. The particle size of the mica flakes is classified by a sieve, according to the particle size ratio of ≦20 mesh: 20-40 mesh: ≧40 mesh = Combine at a ratio of 1:6:3, then modify with cationic starch, the mass concentration of cationic starch is 0.01%, the modification time is 60min, the concentration of modified mica slurry is 10%, and the modified mica sheet is obtained after washing. ; Use silane coupling agent to modify the para-aramid chopped fiber with a length of 12mm and a fineness of 1.5D, the mass concentration of the coupling agent is 3%, and the consumption is 0.1% of the dry mass of the relative para-aramid chopped fiber, The modification time was 10 hours, fully decomposed and dispersed, and a slurry A with a mass concentration of 0.01% was prep...

Embodiment 2

[0035] Example 2 Preparation of para-aramid fiber mica paper by the method of the present invention

[0036] Ultrasonic treatment is used to peel mica flakes into mica flakes. The power is 1500W, and the time is 5h. The particle size classification of mica flakes is carried out by a sieving instrument. Combine at a ratio of 2:5:3, and then modify with cationic starch, the mass concentration of cationic starch is 0.05%, the modification time is 30min, the concentration of modified mica slurry is 16%, and the modified mica sheet is obtained by washing after modification; Use a silane coupling agent to modify para-aramid chopped fibers with a length of 12mm and a fineness of 1.5D. The mass concentration of the coupling agent is 5%, the modification time is 5h, and the dosage is 0.5% of the absolute dry mass of the chopped fibers. Fully deconcentrate and disperse to obtain a slurry A with a mass concentration of 0.02%; pass the aramid precipitated fiber with a beating degree of 50...

Embodiment 3

[0037] Example 3 Preparation of para-aramid fiber mica paper by the method of the present invention

[0038] Ultrasonic treatment is used to peel off mica flakes into mica flakes. The power is 3000W and the time is 1h. The particle size classification of mica flakes is carried out by a sieving instrument. Combine at a ratio of 3:4:3, and then modify with cationic starch, the mass concentration of cationic starch is 0.1%, the modification time is 10 minutes, the concentration of modified mica slurry is 20%, and the modified mica sheet is obtained by washing after modification; Use a silane coupling agent to modify para-aramid chopped fibers with a length of 12mm and a fineness of 1.5D. The mass concentration of the coupling agent is 10%, the modification time is 1h, and the dosage is 1% of the absolute dry mass of the chopped fibers. Fully deconcentrate and disperse to obtain a slurry A with a mass concentration of 0.05%; pass the aramid precipitated fiber with a beating degree...

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Abstract

The invention relates to a preparation method of para-aramid fiber mica paper. First, the para-aramid chopped fiber modified by a silane coupling agent is disentangled and dispersed to obtain slurry A; the beating degree is 40-65° The para-aramid fibrils of SR are screened to obtain slurry B; the mica sheet is modified with cationic starch solution to obtain modified mica sheet; the slurry A, slurry B and modified mica sheet are mixed evenly to obtain Mixed pulp, wherein, in terms of mass percentage, para-position chopped aramid fiber is 10-20%, para-aramid precipitated fiber is 20-40%, and mica sheet is 40-70%; the mixed pulp is sized and dehydrated Forming, pressing and drying, and then hot pressing to obtain para-aramid fiber mica paper. The para-aramid fiber mica paper prepared by the process of fiber screening and modification, wet papermaking, hot pressing and other processes has good paper evenness, excellent mechanical strength, dielectric breakdown strength and high temperature stability sex.

Description

【Technical field】 [0001] The invention belongs to the intersection field of papermaking industry and insulation industry, and in particular relates to a preparation method of para-aramid fiber mica paper. 【Background technique】 [0002] With the gradual depletion of high-quality mica resources, mica paper prepared from mica fragments has the characteristics of non-toxic, odorless, corrosion-resistant, aging-resistant, small fluctuations in dielectric strength, high and stable corona inception voltage, and is the most advanced in the world. Ideal high temperature resistant insulating material. Mica paper is a paper-based insulating material prepared by modern paper-making wet papermaking with fine mica sheets as the main raw material. Its forming mainly depends on the van der Waals force and electrostatic force between the mica sheets, resulting in a small mechanical strength of the paper. It is difficult to meet the requirements of use and the production efficiency is low. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H15/12D21H13/26D21H13/38D21F11/00D21H25/04
CPCD21F11/00D21H13/26D21H13/38D21H15/12D21H25/04
Inventor 王典新江明孙岩磊张峻华王川光李宏
Owner YANTAI METASTAR SPECIAL PAPER
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