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Method for making mica paper by reinforcement of aramid short fiber and chemical pulping

A technology of aramid chopped fiber and reinforced chemistry, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, papermaking, etc., and can solve the problem of lack of natural mica sheet material strength, difficulty in increasing vehicle speed, mica paper Low strength and other problems to achieve the effect of reducing the probability of paper breakage, increasing the speed of the vehicle, and improving the insulation strength and dielectric strength

Inactive Publication Date: 2011-05-18
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0004] However, powder mica paper is made of mica fragments by papermaking method. There are only very weak forces such as van der Waals force and charge attraction between mica fragments, and it does not have the strength of natural mica sheet materials. Although it is compounded with glass during use , polyester and other substrates, but there are also papermaking and compounding processes, due to the low strength of the mica paper, the paper is easy to break, and the speed is difficult to increase, resulting in extremely low production efficiency

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  • Method for making mica paper by reinforcement of aramid short fiber and chemical pulping

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Embodiment Construction

[0021] Clean the mica fragments to remove impurities, and then put them into the intermittently heated rotary furnace for calcination, so that the mica can lose part of the crystallization water in the crystal, so that the mica will expand significantly along the vertical direction of the cleavage plane and stratify, becoming loose and Soft, dipped in a certain concentration of acid-base solution to form mica sheets, and graded into chemically powdered mica pulp with a certain degree of beating. Add 3%-15% aramid fiber (relative to the mass ratio of mica chips) in the slurry. Prepare mica aramid fiber pulp, and use paper machine to make paper. The skeleton effect of aramid fiber improves the strength of mica paper. Specific steps are as follows:

[0022] (1) Sorting powder mica fragments, removing biotite, green mica and some associated impurities that cannot be used for making mica paper, and removing thick mica sheets with a thickness greater than 1.3mm.

[0023] (2) Wash ...

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Abstract

The invention relates to a method for making mica paper by reinforcement of aramid short fiber and chemical pulping. The method comprises the following steps: cleaning mica flakes to remove impurities; putting the mica flakes to an intermittent heating rotary furnace for calcination to remove a part of crystal water in the crystal of mica and generate remarkable expansion and delamination along the vertical direction of a cleavage plane so as to make the mica loose and flexible; dipping the mica in acid or alkali solution at a certain concentration, delaminating into mica sheets, and classifying the mica sheets into chemical mica pulp with certain beating degree; and adding 3 to 15 percent of aramid fiber (based on the mass of the mica flakes) into the pulp, preparing mica aramid pulp, and making the mica aramid pulp into paper by a paper machine. The framework effect of the aramid improves the strength of the mica paper.

Description

technical field [0001] It belongs to the intersection field of papermaking industry and insulation industry. Background technique [0002] The manufacturing technology of mica paper, large-scale integrated circuits, high-temperature plastics, and optical fibers are known as one of the four major technologies that have contributed to the contemporary electrical and electronic industries. Mica paper is a high-quality insulating material with the characteristics of non-toxic, odorless, high temperature resistance, high pressure resistance, aging resistance and corrosion resistance. my country is rich in mica ore reserves, but the utilization rate of mica from raw ore to processing into various sheet mica products is only about 3% to 10%, and a large number of mica fragments and slag have accumulated over the years. It is a very important subject to make use of pulping and papermaking technology to produce various types of mica paper with mica fragments as raw materials, so tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/26D21H23/18
Inventor 张美云陆赵情花莉王志杰夏新兴徐永建曹力君王建
Owner SHAANXI UNIV OF SCI & TECH
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