Heat-resistant additive for transformer insulating paper, preparation method and application thereof

A technology of heat-resistant additives and insulating paper, which is applied in the direction of paper, papermaking, paper coating, etc., can solve the problems of weak force, easy damage and fracture, etc., and achieve increased bonding strength, good water solubility, and improved high-temperature aging resistance Effect

Active Publication Date: 2018-04-17
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding the above-mentioned heat-resistant modifier has a certain heat-resistant modification effect, but because the force between the modifier and the fiber is van der Waals force and non-chemical bond force, the force is not strong, and it is easy to break and break at high temperature

Method used

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  • Heat-resistant additive for transformer insulating paper, preparation method and application thereof
  • Heat-resistant additive for transformer insulating paper, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Mix 80g of polyvinylpyrrolidone, 10g of melamine, and 9.5g of dicyandiamide and dissolve in water, heat to 40°C, stir and dissolve, then drop to room temperature and then add 0.5g of ammonium persulfate, stir evenly to form a solid 5% heat-resistant additive. The base paper of insulating 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 5-7g / m 2 . The strength index test results of the finished paper after the aging test are shown in Table 1.

Embodiment 2

[0014] Embodiment two: polyvinylpyrrolidone 50g is dissolved in water and stirred at room temperature to dissolve, dicyandiamide 20g and casein 25g are dissolved in ethanol solution (the amount of ethanol is 30% of water) stirred and dissolved at room temperature, and then the two solutions are mixed, After stirring evenly, 5 g of ammonium persulfate was added at room temperature to prepare a heat-resistant additive with a solid content of 8%. Insulation paper base paper is pre-dried to 70% moisture, double-sided coating with a scraper bar, and the total coating amount on both sides is 4-6g / m 2 . The strength index test results of the finished paper after the aging test are shown in Table 1.

Embodiment 3

[0015] Example 3: Add 20 g of polyvinylpyrrolidone, 50 g of dicyandiamide, and 20 g of polyacrylamide into water, stir and dissolve at 90° C., drop to room temperature, add 10 g of potassium persulfate, and stir evenly to prepare a polyvinyl pyrrolidone with a solid content of 20%. Heat-resistant additives. 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 5-6g / m 2 . The strength index test results of the finished paper after the aging test are shown in Table 1.

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Abstract

The invention discloses a preparation and application method of an assistant for improving high-temperature aging resistance of transformer insulating paper and belongs to the field of the transformer insulating paper. The method comprises the steps of compounding a polyvinyl pyrrolidone macromolecular compound with a high-temperature self-crosslinking property, an initiator and a nitrogen containing compound so as to prepare the heat-resistant assistant, and applying the heat-resistant assistant to the surface of the insulating paper by a coating, spray-coating or dipping method. Polyvinyl pyrrolidone is subjected to a self-crosslinking reaction in the presence of the initiator at a high temperature so as to form a three-dimensional network structure, and fibers of the paper are interwoven in a chemical bond forming manner, so that the bonding action among the fibers is enhanced, and the improvement on the aging resistance of the paper is facilitated. According to the insulating paper prepared by adding the heat-resistant assistant disclosed by the invention, the high-temperature aging resistance is excellent and is improved by 15% to 30% under the same conditions, and the insulating performance of a transformer system is not affected.

Description

technical field [0001] The invention relates to the technical field of transformer insulating paper, in particular to a heat-resistant additive for transformer insulating paper, a preparation method and application. Background technique [0002] The relevant performance of insulating paper for transformers determines the operating performance and normal service life of transformers to a large extent. 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 a decrease in the degree of polymerization and a decrease in mechanical strength. Security has a huge impact. There is a patented method of producing cyanoethylated cellulose from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/34D21H19/56D21H19/64D21H17/66D21H17/35
CPCD21H17/35D21H17/66D21H19/46D21H19/56D21H19/64D21H21/34
Inventor 毛萃刘文刘群华黄小雷
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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