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Manufacturing method of mica paper for capacitor

A manufacturing method and technology of mica paper, applied in the direction of special paper, papermaking, paper, etc., can solve the problems of unusable production volume and low dielectric strength, achieve small size, good quality, improve electrical performance and tensile strength Effect

Pending Publication Date: 2022-04-05
SICHUAN MEIFENG MICA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mica paper produced by these two methods has the performance defect of low dielectric strength, and cannot be used to produce mica capacitors with small size and high temperature and high pressure resistance.

Method used

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  • Manufacturing method of mica paper for capacitor
  • Manufacturing method of mica paper for capacitor
  • Manufacturing method of mica paper for capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , a kind of manufacture method of mica paper for capacitor, comprises the steps:

[0028] a. Raw material sorting: select high-quality mica raw materials;

[0029] b. Roasting: put the mica raw material into the roasting furnace for roasting, the roasting temperature is 750-850°C, the roasting time is 40-50min, and then cooled to room temperature;

[0030] c, chemical cooking: first prepare a carbonate solution with a mass concentration of 1%, add the mica raw material roasted in step b, soak in the carbonate solution for 10 to 15 minutes, and then soak the mica in the carbonate solution Put the raw materials into an acid solution with a mass concentration of 3-5%, heat to boiling and cook for 30 minutes;

[0031] d. Washing: filter out the raw materials cooked in the acidic solution, and wash with clear water until the raw material washing water is neutral;

[0032] e. Pulping: the washed raw materials are crushed and filtered to prepare a slurry with a...

Embodiment 2

[0044] This embodiment adopts artificially selected raw materials, and selects high-quality natural muscovite fragments as raw materials, with an area size of 5 cm 2 About, thickness 1 ~ 2mm. Weathered mica, rusty mica, stained mica, ore and foreign impurities are not allowed in the raw materials, and the quantity is 10kg / bag. After preheating the roasting furnace to 750°C, open the furnace cover and pour in a bag of 10kg of raw materials, close the furnace cover, and pour out after roasting for 40 minutes while the furnace body is rotating. Let cool to room temperature.

[0045] The raw materials after roasting are screened by drum type sieves, the powder is removed, and the mass concentration of carbonate solution is 1% in the alkali tank. The mica raw materials after roasting are first soaked in carbonate solution for 10 minutes, and then The mass concentration of the acid solution in the vat is 3%, put the mica raw material treated with the carbonate solution into the ac...

Embodiment 3

[0048] Using artificially selected raw materials, high-quality natural muscovite fragments are selected as raw materials, with an area of ​​about 5cm2 and a thickness of 1-2mm. Weathered mica, rusty mica, stained mica, ore and foreign impurities are not allowed in the raw materials, and the quantity is 10kg / bag. After preheating the roasting furnace to 800°C, open the furnace cover and pour in a pack of 10kg raw materials and close the furnace cover, pour out after 45 minutes of roasting time under the rotating state of the furnace body, and cool to room temperature;

[0049] The roasted raw materials are screened through a drum sieve to remove the powder, and a carbonate solution with a mass concentration of 1% is prepared in an alkali vat. The roasted mica raw material is first soaked in a carbonate solution for 12 minutes, and then placed in an acid vat. The mass concentration of the internal acid solution is 4%, put the mica raw material treated with the carbonate solution...

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Abstract

The invention relates to the technical field of mica paper preparation, and discloses a manufacturing method of mica paper for capacitors, the manufacturing method comprises the technological processes of raw material sorting, roasting, chemical cooking, washing, pulping, papermaking and the like, and in the chemical cooking process, a carbonate solution is firstly adopted for soaking, and then an acid solution is added for cooking. The preparation method comprises the following steps: soaking a roasted and expanded mica raw material in a carbonate solution, heating the soaked mica raw material in an acid solution until the mica raw material is boiled and cooked, violently expanding mica sheets, and violently splitting and disintegrating internal interlayer gaps along a cleavage plane under the dual actions of an alkali-acid high-temperature reaction and carbon dioxide gas, so as to obtain a mica sheet; the mica flakes which are as large and thin as possible are formed, the mica flakes with the large radius-thickness ratio are good in quality, the overlapped finished paper is stable in structure and high in flexibility, the electrical performance and tensile strength of the mica paper are improved, and the mica paper can be used for producing mica capacitors which are small in size and resistant to high temperature and high pressure.

Description

technical field [0001] The invention relates to the technical field of mica paper preparation, in particular to a method for manufacturing mica paper for capacitors. Background technique [0002] Mica is a general term for a class of hydrous aluminosilicates. Mica has high electrical strength, low dielectric loss, high surface resistance and volume resistance, heat resistance, water resistance, chemical stability, elasticity, high peelability, shear resistance and high tensile strength. It is widely used in the field of electric motor insulation. The most industrial value of mica is muscovite [KAl 2 (AISi 3 o 10 )(OH) 2 ] and phlogopite [KMg 3 (AISi 3 o 10 )(OH) 2 ]. [0003] Mica capacitor is a commonly used capacitor. The existing mica capacitor is sprayed with a silver layer on the metal foil or mica sheet as the electrode plate. Made of resin. However, the production cost of mica chip capacitors is high, the appearance volume is large, the weight is heavy, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/44D21H27/00
Inventor 吴红涛
Owner SICHUAN MEIFENG MICA IND
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