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Preparation method of phenyl-polysilsesquioxane modified meta-aramid insulating paper

A technology of polysilsesquioxane and insulating paper, which is applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve the problems of limited insulation life, poor mechanical properties and thermal stability, and achieve dielectric Reduced constant, improved shielding and cushioning effects, and improved thermal stability

Inactive Publication Date: 2020-09-08
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem mainly solved by the present invention is: aiming at the disadvantages of the traditional aramid insulating paper having poor mechanical properties and thermal stability, which lead to a limited insulation life during its use, a phenyl-polysilsesquioxane pair is provided. Preparation method of meta-aramid insulating paper;

Method used

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  • Preparation method of phenyl-polysilsesquioxane modified meta-aramid insulating paper
  • Preparation method of phenyl-polysilsesquioxane modified meta-aramid insulating paper
  • Preparation method of phenyl-polysilsesquioxane modified meta-aramid insulating paper

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example 1

[0038] In parts by weight, take 50 parts of sepiolite, 8 parts of aluminate coupling agent, and 100 parts of absolute ethanol in sequence, pour them into a ball milling tank, and add zirconia ball milling beads according to the mass ratio of balls to materials at 30:1 , after ball milling and mixing for 6 hours, the material was discharged to obtain a ball mill, and then the obtained ball mill was transferred to a vacuum drying oven, and the temperature was 95° C., and the pressure was 80Pa. Foam: In parts by weight, 80 parts of silicate, 30 parts of aluminum alkoxide, 200 parts of absolute ethanol, 40 parts of oleic acid, and 10 parts of modified sepiolite are mixed and poured into a three-necked flask. And transfer the three-necked flask into an ultrasonic disperser, and ultrasonically disperse for 60 minutes under the condition of an ultrasonic frequency of 55 kHz, then move the three-necked flask to a digital display speed measuring constant temperature magnetic stirrer, an...

example 2

[0040] Add aramid chopped fiber and water into the reaction kettle at a mass ratio of 1:8, stir and disperse with a stirrer at a speed of 600r / min for 30 minutes, then add dopamine with 3% mass of aramid chopped fiber, and add dopamine solution lye with a mass of 10%; after continuing to stir and react for 2 hours, drop a silane coupling agent ethanol solution with a mass of 15% aramid chopped fibers into the reactor at a rate of 10mL / min, and wait until the silane coupling agent ethanol solution is added dropwise , continue to stir and react for 5 hours to obtain a modified aramid chopped fiber dispersion; then use a paper sample machine to copy the mixed slurry into shape, and heat press to obtain a dry paper sheet, and then use a calender to calender. That is to obtain the modified insulating paper hand-sheet, which is denoted as C0; the aramid chopped fiber is 6mm in length and 15um in diameter; the ethanol solution of the silane coupling agent is made of silane coupling ag...

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Abstract

The invention relates to a preparation method of phenyl-polysilsesquioxane modified meta-aramid insulating paper, and belongs to the technical field of insulating materials. According to the method, phenyl-polysilsesquioxane (PPSQ) and meta-aramid fibers are modified, a conventional paper sheet forming method is adopted, and a modified insulating paper handsheet is obtained through the processes of dispersion in deionized water, fiber dissociation, mixing and stirring, filtering, papermaking, paper forming, drying, hot pressing and the like. Due to the addition of the PPSQ, a larger structuralspace is locally provided for the meta-aramid fibers, the free volume of the whole system is increased, the intermolecular structure of the meta-aramid fibers is improved, the tightness between molecular chains of the meta-aramid fibers is enhanced, the structure between paper becomes more compact, the interpermeability between the chains of the aramid fibers is further enhanced, the stress can be better transferred, the performance loss such as interphase layering is effectively prevented, and the bonding capacity between macromolecules of the aramid fibers is firmer. And meanwhile, the insulating paper prepared by the method has relatively high thermal aging resistance, and the thermal stability and the like are also improved.

Description

technical field [0001] The invention belongs to the field of power systems, in particular, the invention relates to the field of oil-paper insulation systems inside power transformers. Background technique [0002] In recent years, with the development of the power network in the direction of "ultra-high voltage and large capacity", the internal oil-paper insulation system of power transformers will face more difficult challenges. During long-term operation, the thermal aging phenomenon of insulating paper leads to the deterioration of its mechanical properties and affects its thermal stability, which eventually leads to the decline of transformer insulation performance and shortens its service life. The prolongation of the service life of the transformer and the complexity of the electric field distribution in the EHV and UHV transformers put forward stricter requirements on the performance of the oil-paper insulating material. It is of great significance to ensure the lon...

Claims

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Application Information

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IPC IPC(8): D21H13/26D21H17/59C08G77/04C08G77/06D06M13/368C01B33/22D21H27/12H01B3/52D06M101/36
CPCD21H13/26D21H17/59C08G77/04C08G77/06D06M13/368C01B33/22H01B3/52D06M2101/36
Inventor 唐超李娇郭丽郑伟杨路邱秦攀张静文杜东元
Owner SOUTHWEST UNIVERSITY
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