Method for preparing electrical insulating papers containing broadleaf wood fibers

An electrical insulation and hardwood technology, applied in the field of electrical insulation paper, can solve problems such as unspecified

Inactive Publication Date: 2015-08-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the standard does not indicate that the wood pulp used must be softwood pulp

Method used

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  • Method for preparing electrical insulating papers containing broadleaf wood fibers

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preparation example Construction

[0014] The preparation method of the electric insulating paper that the present invention proposes contains hardwood fiber, comprises the following steps:

[0015] (1) Under ambient temperature, submerge the softwood pulp dry board and the hardwood pulp dry board in deionized water for 12 hours, respectively, to obtain a softwood pulp wet board and a hardwood pulp wet board;

[0016] (2) Utilize beater, respectively or mix above-mentioned coniferous wood pulp wet pulp board and broad-leaved wood pulp wet pulp board to decompose, beating, beating concentration is 0.5%~2%, and beating time is 5 minutes~25 minutes, makes pulp The Schober beating degree of material is 10 ° SR~45 ° SR, obtains pulp suspension, the mass ratio in the suspension is, softwood pulp fiber: hardwood pulp fiber=1:(0.1~1);

[0017] (3) According to the quantitative size of the paper sheet, take the above-mentioned pulp suspension and put it into the paper sheet forming equipment for dehydration forming to o...

Embodiment 1

[0023] (1) Under ambient temperature, immerse softwood pulp dry pulp board in deionized water for 12 hours to obtain softwood pulp wet pulp board;

[0024] (2) Utilize beater, above-mentioned coniferous wood pulp wet pulp plate is loosened, beating, and beating concentration is 0.5%, and beating time is 25 minutes, and the Schober beating degree of slurry is 40 ° of SR;

[0025] (3) Paper weight 490g / m 2 , take 12L of the above pulp suspension, put it into the paper forming equipment for dehydration forming, and obtain the electrical insulating paper of the required specification;

[0026] (4) Carry out hot-pressing treatment to above-mentioned insulating wet paper, hot-pressing pressure is 500N / cm 2 , the hot-pressing temperature is 115° C., and the hot-pressing time is 5 minutes to obtain a finished product of electrical insulating paper after hot-pressing and drying.

[0027] (5) The finished electrical insulating paper prepared above is stored in a constant temperature a...

Embodiment 2

[0030] (1) Under ambient temperature, submerge the softwood pulp dry board and the hardwood pulp dry board in deionized water for 12 hours, respectively, to obtain a softwood pulp wet board and a hardwood pulp wet board;

[0031] (2) Utilize beater, carry out disentanglement, beating to above-mentioned coniferous wood pulp wet pulp board and hardwood pulp wet pulp board respectively, coniferous wood pulp beating concentration is 0.5%, and beating time is 25 minutes, and the Shober beating of slurry The beating degree of hardwood pulp is 40°SR; the beating concentration of hardwood pulp is 0.5%, the beating time is 21.5 minutes, and the Schober beating degree of pulp is 38°SR. Then softwood pulp beating liquid and hardwood pulp beating liquid are mixed, mixing mass ratio is: softwood pulp fiber: hardwood pulp fiber=1:0.11, stirs evenly, obtains pulp suspension;

[0032] (3) Paper weight 490g / m 2 , take 12L of the above pulp suspension, put it into the paper forming equipment f...

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Abstract

The invention relates to a method for preparing electrical insulating papers containing broadleaf wood fibers, which belongs to the technical field of electrical insulating papers, wherein needle-point leaf wood pulp dry pulp boards and broadleaf wood pulp dry pulp boards are immersed in deionized water to soak firstly, and are respectively or commonly defibered and beaten by utilizing a beating machine after being soak, and then two kinds of pulps are mixed and uniformly stirred to obtain paper pulp suspension liquid. The paper pulp suspension liquid is put into a paper page forming device to dehydrate and form, and obtains electrical insulating papers. Wet insulating paper pages are autoclaved to obtain finished electrical insulating papers after being autoclaved and dried. The finished electrical insulating papers are placed in constant temperature and constant humidity environment to store and reserve, the temperature of the constant temperature and constant humidity environment is 25 EDG C, and the relative humidity of the constant temperature and constant humidity environment is 50%. The method for preparing the electrical insulating papers containing the broadleaf wood fibers adds certain proportion of broadleaf wood fibers into needle-point leaf wood insulating papers, is simple in process and easy to operate, has lower price compared with needle-point leaf wood pulps, is obvious in economic advantages, and can effectively reduce production cost under the premise that electrical performance of insulating papers is guaranteed.

Description

technical field [0001] The invention relates to a preparation method of electrical insulating paper containing hardwood fiber, belonging to the technical field of electrical insulating paper. Background technique [0002] The preparation and production of paper sheets usually use plant fibers as raw materials, including wood fiber, bamboo fiber, grass fiber, cotton fiber, etc. The corresponding raw pulp is called wood pulp, bamboo pulp, straw pulp and cotton pulp. In recent years, in order to protect the environment, recycled pulp made from recycled waste paper has also gradually received attention. From the perspective of raw pulp cost, the prices of softwood pulp and cotton pulp are higher, while the prices of hardwood pulp, bamboo pulp, and straw pulp are lower. For example, the price difference between bleached softwood pulp and bleached hardwood pulp can reach 800 yuan per ton about. As a special paper, insulating paper is widely used in oil-immersed power transformer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/12D21H15/10
Inventor 周远翔黄建文郭玥
Owner TSINGHUA UNIV
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