A kind of production method of high temperature resistant insulating cardboard

A technology of insulating cardboard and production methods, which is applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve the problems of reduced service life and reduced service life, achieve firm bonding, improve cleanliness, and improve slurry uniformity degree of effect

Active Publication Date: 2022-05-24
WEIFANG HUISHENG INSULATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Otherwise, the service life will be reduced according to the 6°C law (for every 6°C increase in the temperature of Class A insulation, the service life will be reduced by half. This law is called the 6°C law of thermal aging) to reduce the service life.

Method used

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  • A kind of production method of high temperature resistant insulating cardboard
  • A kind of production method of high temperature resistant insulating cardboard
  • A kind of production method of high temperature resistant insulating cardboard

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment one: Production of 3.0mm cardboard

[0034] S1. Raw material selection

[0035] Meta-chopped aramid fiber, length 2.5mm; pure imported 100% unbleached kraft softwood pulp (Swedish electronic grade aspar wood pulp, Canadian electronic grade Prince George wood pulp), fiber length 3mm, wall thickness 2.5 um, fiber diameter 0.03mm, ash content 0.3%, conductivity 3.0mS / m.

[0036] S2, the disintegration of pulp (pulping)

[0037] a. Put 1200kg of pure imported 100% unbleached kraft softwood pulp (600kg Aspar + 600kg Prince George) into the D-type hydraulic pulper, and add 22800kg of pure water with a conductivity lower than 18uS / cm to make The slurry concentration after mixing was 5%. Turn on the D-type water conservancy pulper, after dissolving the pulp board into fibers, turn on the pulp pump, pump it to the fore-milling tank A, and let it stand for 2 hours, so that the fibers are fully swollen in the pure water environment. Subsequently, according to the p...

Embodiment 2

[0048] Embodiment two: The second production of 3.0mm cardboard

[0049] In the production process of this example, the ratio of wood pulp raw material and non-ionic polymer surfactant (the sum of acrylamide + water-soluble phenolic resin) is adjusted to 10:2, the concentration of 120kg is 8.0% acrylamide, and the concentration of 120kg is 10%. The water-soluble phenolic resin; the remaining process conditions are the same as in Example 1.

Embodiment 3

[0050] Embodiment three: The third production of 3.0mm cardboard

[0051] In the production process of this example, the ratio of wood pulp raw material and non-ionic polymer surfactant was adjusted to 10:3, and 180 kg of water-soluble phenolic resin with a concentration of 8.0% acrylamide and 180 kg of acrylamide with a concentration of 10% was added; the rest of the process conditions remained unchanged. .

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Abstract

The invention discloses a method for producing high-temperature-resistant insulating paperboard. Meta-chopped aramid fibers and 100% unbleached kraft softwood pulp are selected as raw materials, and acrylamide and water-soluble Adding pure water, acrylate and polyether to meta-chopped aramid fibers for treatment and mixing, and then refining, paper machine papermaking, press hot pressing, cutting and shaping to obtain the final product. The present invention can raise the temperature resistance grade of the insulating cardboard of the existing Class A transformer from 105°C to 130°C, thereby reducing the influence of aging damage on the insulating material caused by overheating during the operation of the transformer, and further improving the service life and safe operation performance of the transformer .

Description

technical field [0001] The invention belongs to the technical field of production of insulating products, in particular to a production method of high temperature resistant insulating paperboard. Background technique [0002] With the development of society, the application of electric power is becoming more and more widespread, and the requirements for power supply are constantly improving, and the importance of electrical equipment, especially transformer equipment, has become more and more prominent. Transformer, as an energy conversion device, is unavoidable to have energy loss during operation. The main manifestation of energy loss is the temperature rise of the transformer. Oil-immersed transformers will increase the internal temperature of the transformer with the increase of operating time, the change of temperature rise, the oxidation of transformer oil, the deterioration of oil quality, etc., and the insulating material, one of the important components of the trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/26D21H15/02D21H11/04D21H17/07D21H17/48D21H21/24D21H17/14D21H17/53D21H21/10D21H27/12H01B3/52
CPCD21H13/26D21H15/02D21H11/04D21H17/07D21H17/48D21H21/24D21H17/14D21H17/53D21H21/10H01B3/52
Inventor 黄文礼许桂娟李文明
Owner WEIFANG HUISHENG INSULATION TECH
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