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Preparation method of micro/nano composite fiber electrical insulation paper

A nano-composite fiber, electrical insulation technology, used in plastic/resin/wax insulators, special paper, insulators, etc., can solve the problems of reduced bonding strength between fibers, poor compatibility, and reduced mechanical properties of insulating paper.

Active Publication Date: 2017-10-24
TSINGHUA UNIV
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Problems solved by technology

For insulating paper, existing studies have explored the addition of inorganic nanoparticles to improve the electrical properties of insulating paper, such as nano-SiO 2 , nano-MgO, nano-montmorillonite, etc., but due to the poor compatibility between inorganic nanoparticles and organic plant fibers, the bonding strength between fibers is reduced, and the mechanical properties of the prepared insulating paper are reduced.

Method used

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  • Preparation method of micro/nano composite fiber electrical insulation paper
  • Preparation method of micro/nano composite fiber electrical insulation paper
  • Preparation method of micro/nano composite fiber electrical insulation paper

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preparation example Construction

[0020] The preparation method of the electric insulating paper that the present invention proposes contains hardwood fiber, comprises the following steps:

[0021] (1) At ambient temperature, respectively immerse the softwood dry pulp board and the plant nanofiber dry pulp board in deionized water, and soak for 12 hours to obtain the softwood wood wet pulp board and the plant nanofiber wet pulp board, and the plant Nanofibers are any one or more of hardwood fibers, bamboo fibers, hemp fibers and cotton fibers mixed in any proportion;

[0022] (2) The above-mentioned coniferous wood wet pulp board and the plant nanofiber wet pulp board are respectively disentangled and beaten, so that the mass percent concentration of the slurry is 0.5 to 2%, and the beating time is 10 minutes to 50 minutes, so that the Schobber of the slurry The degree of beating is 10 ° SR~60 ° SR, respectively to obtain the first pulp suspension and the second pulp suspension;

[0023] (3) Disperse the nano...

Embodiment 1

[0031] (1) Submerge the softwood pulp dry board in deionized water at ambient temperature for 12 hours to obtain the softwood pulp wet board. The dry pulp of softwood pulp used in this embodiment is Canadian Prince George pulp;

[0032] (2) Utilize beater, above-mentioned coniferous wood pulp wet pulp plate is carried out loosening, beating, make slurry mass percentage concentration be 0.5%, beating time is 25 minutes, and the Schober beating degree of obtained slurry is 37 ° Sr.

[0033] (3) Paper weight 490g / m 2 , take 12L of the above-mentioned coniferous wood fiber suspension, put it into a sheet forming equipment for dehydration forming, and obtain a wet sheet of electrical insulating paper of the required specification;

[0034] (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 insul...

Embodiment 2

[0038] (1) Under ambient temperature, the softwood pulp dry pulp board and the hardwood pulp dry pulp board were respectively immersed in deionized water for 12 hours to obtain a softwood pulp wet pulp board and a hardwood pulp wet pulp board; this embodiment The hardwood pulp dryboard used is Fujian Qingzhou masson pine paddleboard, and the softwood pulp dryboard is Canadian Prince George pulp;

[0039] (2) Utilize beater, carry out disentanglement, beating to above-mentioned softwood pulp wet pulp board and hardwood pulp wet pulp board respectively, make the mass fraction of softwood pulp slurry be 0.5%, beating time is 25 minutes, obtained slurry The Schober beating degree of the obtained slurry is 37 ° SR; the mass fraction of the hardwood pulp slurry is 0.5%, and the beating time is 20 minutes, and the Schober beating degree of the obtained slurry is 37 ° SR, so that the first pulp suspension is obtained respectively liquid and the second pulp suspension;

[0040] (3) Th...

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Abstract

The invention relates to a preparation method of a micro / nano composite fiber electrical insulation paper, and belongs to the technical field of electrical insulation paper. The preparation method comprises the following steps: individually soaking a dry pulp board of softwood pulp and a dry pulp board of other micro fiber pulp in deionized water for 12 hours, after soaking, tearing the pulp boards into pieces with a size of 25 mm*25 mm; then decomposing and beating the processed softwood pulp board and other micro fiber pulp board by a beating machine; carrying out an ultrasonic dispersion treatment, mixing a proper amount of softwood pulp, other micro fibers, and nano fibers, and processing the mixture for 5 to 20 minutes by a stirring device. A mixing beating mode can also be adopted. Namely, preprocessed softwood pulp board and other micro fiber pulp board are directly mixed according to a certain ratio, then the mixture is decomposed and beaten by a beating machine, and the Schopper-Riegler beating degree is controlled in a range of 10 to 60 degrees SR. The process is simple, the operation is easy, and the tensile strength and breakdown field strength of prepared electrical insulation paper are both improved effectively.

Description

technical field [0001] The invention relates to a preparation method of micro / nano composite fiber electrical insulating paper, which uses nanofibers and micron fibers to combine to improve the mechanical and electrical properties of the existing coniferous wood fiber insulating paper, and belongs to the technical field of electrical insulating paper. Background technique [0002] As a special paper, insulating paper has the advantages of excellent performance, low cost, environmental friendliness, and renewability. Therefore, it is widely used in oil-immersed power transformers and converter transformers of various voltage levels. At present, cotton pulp and softwood pulp are usually used in the world to prepare insulating paper, while 100% unbleached kraft softwood pulp is used in China. The rapid development of the electric power industry has put forward higher requirements for transmission distance and transmission capacity. In order to realize "West-to-East Power Trans...

Claims

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Application Information

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IPC IPC(8): D21H27/12D21H15/10D21H11/12D21F13/10
CPCD21F13/10D21H11/12D21H15/10D21H27/00
Inventor 周远翔黄建文周仲柳莫雅俊黄欣聂皓
Owner TSINGHUA UNIV
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