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Method for manufacturing extra-high-voltage composite insulation paper board

A composite insulation and ultra-high voltage technology, applied in the direction of insulators, insulators, electrical components, etc., can solve problems such as low temperature resistance, poor mechanical strength, affecting the miniaturization of power transmission and transformation equipment, and the prospect of large-capacity UHV development. Achieve the effect of reducing partial discharge and lowering the dielectric constant

Active Publication Date: 2014-01-01
HUNAN HENGYUAN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the insulating paperboard produced in my country is mainly B-grade and F-grade, and there are deficiencies in some performance aspects, such as unstable performance, poor mechanical strength (delamination and edge collapse were found during processing), insufficient heat resistance, and environmental impact. Pollution and other problems, especially the inability to withstand high temperatures, have seriously affected the prospects for the development of power transmission and transformation equipment towards miniaturization, large capacity, and UHV

Method used

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  • Method for manufacturing extra-high-voltage composite insulation paper board

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Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of UHV composite insulating paperboard, comprising the steps of:

[0031] 1) Graft modification step of aramid pulp

[0032] a) Put the aramid pulp in a Soxhlet extractor and extract it with ethanol for 10 hours, then extract it with distilled water for 10 hours, then place the aramid pulp in a vacuum environment and dry it at 100°C for 2.5 hours;

[0033] b) Under nitrogen protection, add 140ml of dimethyl sulfoxide and 0.5g of sodium hydride into a three-necked flask, and stir at 28°C for 28min. Then raise the temperature to 70° C. and stir for 38 minutes, and after cooling to 28° C., add 0.024 mol of the aramid pulp treated in step a) into the three-necked flask, and stir for 8 minutes;

[0034]c) Under the protection of nitrogen, filter the aramid pulp treated in step 2 from the three-necked flask, and transfer it to another three-necked flask containing 0.00025mol of grafted monomer and 140ml of dimethyl sulfoxide, at 28°C Under the condition...

Embodiment 2

[0043] A preparation method of UHV composite insulating paperboard, comprising the steps of:

[0044] 1) Graft modification step of aramid pulp

[0045] a) Put the aramid pulp in a Soxhlet extractor and extract it with ethanol for 11 hours, then extract it with distilled water for 11 hours, then place the aramid pulp in a vacuum environment and dry it at 110°C for 3 hours;

[0046] b) Under nitrogen protection, add 150ml of dimethyl sulfoxide and 0.6g of sodium hydride into a three-necked flask, and stir at 30°C for 30min. Then raise the temperature to 72°C and stir for 40 minutes, and after cooling to 30°C, add 0.025 mol of the aramid pulp treated in step a) into the three-necked flask, and stir for 10 minutes;

[0047] c) Under nitrogen protection, filter the aramid pulp treated in step 2 from the three-necked flask, and transfer it to another three-necked flask containing 0.0005mol of grafted monomer and 150ml of dimethyl sulfoxide, at 30°C Under the condition of reaction...

Embodiment 3

[0056] A preparation method of UHV composite insulating paperboard, comprising the steps of:

[0057] 1) Graft modification step of aramid pulp

[0058] a) Put the aramid pulp in a Soxhlet extractor and extract it with ethanol for 12 hours, then extract it with distilled water for 12 hours, then place the aramid pulp in a vacuum environment and dry it at 120°C for 3.5 hours;

[0059] b) Under nitrogen protection, add 160ml of dimethyl sulfoxide and 0.7g of sodium hydride into a three-necked flask, and stir for 32min at 32°C. Then raise the temperature to 74°C and stir for 42 minutes, and after cooling to 32°C, add 0.026 mol of the aramid pulp treated in step a) into the three-necked flask, and stir for 12 minutes;

[0060] c) Under nitrogen protection, filter the aramid pulp treated in step 2 from the three-necked flask, and transfer it to another three-necked flask containing 0.00125mol of grafted monomer and 160ml of dimethyl sulfoxide, at 32°C Under the condition of react...

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Abstract

The invention discloses a method for manufacturing an extra-high-voltage composite insulation paper board. The method comprises the following steps that 1) stem grafting modification is conducted on aramid fiber pulp; 2) an aramid paper board is manufactured. The high-temperature (220 DEG C) resistant performance of aramid fiber is utilized, so that the temperature which the insulation paper board is resistant to is increased to 140 DEG C-150 DEG C; the low dielectric constant of the aramid fiber ranges from 1.6 to 3.7 so that the partial discharge of extra-high-voltage transformer oil can be reduced, the electric intensity of the extra-high-voltage transformer oil and paper insulation are completely used, and the dielectric constant of the paper is reduced. The surface modification technology is conducted on the aramid fiber so that the aramid fiber can be completely merged with wood pulp fiber.

Description

technical field [0001] The invention relates to a preparation method of insulating paperboard, in particular to a preparation method of UHV composite insulating paperboard. Background technique [0002] The UHV power grid refers to the 1000 kV AC and plus or minus 800 kV DC transmission network, which has the characteristics of long-distance, large capacity, low-loss power transmission and land resource conservation. The insulation practice of the UHV power grid shows that the main cause of electrical power outages in the power grid is the flash-off or breakdown of the insulation. In order to ensure that the power grid has an acceptable rationality index, it is very important to select the insulation level scientifically and rationally. The insulation of electrical devices in the power grid will be affected by (a) working voltage (b) temporary overvoltage (c) operating overvoltage (d) lightning overvoltage during operation. The insulation of electrical equipment in the powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B17/60H01B19/00
Inventor 高禄生
Owner HUNAN HENGYUAN NEW MATERIAL TECH CO LTD
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