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Preparation method of heat-resistant auxiliary agent for temperature-resistant insulating paper

A technology of heat-resistant additives and insulating paper, which is applied in the direction of anti-aging paper additives, papermaking, paper coatings, etc., can solve the problems affecting the use of heat-resistant insulating paper and poor folding resistance, and achieve high-temperature aging resistance. Good high temperature performance and excellent insulation performance

Inactive Publication Date: 2021-04-13
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to form chemical bonds between polyvinylpyrrolidone molecular chains, but the polymer does not form bonds with fibers, and the insulating paper becomes brittle after modification and has poor folding resistance, which affects the use of temperature-resistant insulating paper in transformers.

Method used

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  • Preparation method of heat-resistant auxiliary agent for temperature-resistant insulating paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Mix 80 g of water-based polyurethane with methyl ethyl ketone oxime as a sealing agent and 20 g of melamine, add it into water, heat to 30° C., stir and dissolve, and prepare a heat-resistant additive with a solid content of 5%. The insulating paper base paper is pre-dried to 80% moisture, and the dipping method is used to glue the surface with a two-roller glue machine, and the amount of glue dipping is 2-3g / m 2 . The strength index test results of the finished paper after the aging test are shown in Table 1.

Embodiment 2

[0012] Example 2: Mix 50 g of water-based polyurethane with phenol as a sealing agent, 40 g of dicyandiamide, and 10 g of melamine, add to water, stir and dissolve at room temperature, and prepare a heat-resistant additive with a solid content of 10%. Insulation paper base paper is pre-dried to 80% moisture, and coated on one side with a doctor bar, with a total coating weight of 5-6g / m 2 . The strength index test results of the finished paper after the aging test are shown in Table 1.

Embodiment 3

[0013] Example 3: Mix 20 g of water-based polyurethane with caprolactam as a sealing agent, 50 g of dicyandiamide, and 30 g of polyacrylamide, add it to water, stir and dissolve it at 90°C, and stir evenly to form a heat-resistant auxiliary with a solid content of 20%. agent. The insulating paper base paper is pre-dried to 80% moisture, and the heat-resistant additive is sprayed on the insulating paper by spraying, and the coating amount is 9-10g / m 2 . The strength index test results of the finished paper after the aging test are shown in Table 1.

[0014] The insulating paper base paper of Examples 1-3 of the present invention uses 100% unbleached kraft softwood pulp, and the beating degree is about 48°SR. The blank sample compared with Examples 1-3 is the insulating paper base paper without heat-resistant auxiliary agent applied.

[0015] Insulating paper high temperature aging test method: put the insulating paper in a vacuum tube inserted with copper wire, add 25# trans...

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Abstract

The invention discloses a preparation method of a heat-resistant auxiliary agent for temperature-resistant insulating paper. The method comprises the following steps of: compounding enclosed waterborne polyurethane and a nitrogen-containing compound to prepare a heat-resistant auxiliary agent, and applying the heat-resistant auxiliary agent to the surface of the insulating paper through a coating, spraying or dipping method. According to the invention, a deblocking reaction can be carried out by utilizing a blocking group of blocked waterborne polyurethane, an isocyanate group with strong reaction activity is exposed again, and the isocyanate group and hydroxyl on fibers are subjected to a chemical reaction to form a three-dimensional network structure, so that the bonding points and the bonding strength among the fibers are increased, and the high-temperature aging resistance of the insulating paper is obviously improved. The insulating paper prepared by adding the heat-resistant additive has excellent high-temperature aging resistance, the high-temperature aging resistance is improved by 22-27% under the same condition, and the insulation performance of a transformer system is not influenced.

Description

technical field [0001] The invention relates to the technical field of transformer insulating paper, in particular to a preparation method of a heat-resistant additive for transformer insulating paper. Background technique [0002] At present, most large-scale power transformers are oil-immersed power transformers. Cellulose insulating paper is one of the most widely used internal insulation materials in oil-immersed power transformers. Since it cannot be replaced during operation, its mechanical and insulating properties directly determine The service life of the transformer. As the voltage level of transformers increases, the performance of insulating paper for transformers also faces higher requirements. Especially the insulating paper used in ultra-high voltage and ultra-high voltage transmission transformer equipment, in a high temperature environment for a long time, the paper fibers will undergo thermal degradation, hydrolysis and oxidative degradation, resulting in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/24D21H19/14D21H19/26D21H19/20D21H21/14D21H19/84
CPCD21H19/24D21H19/14D21H19/26D21H19/20D21H21/143D21H19/84
Inventor 毛萃孟凡锦刘文
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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