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Application of high-temperature aging resisting adjuvant for transformer insulating paper

A technology for insulating paper and transformers, applied in insulators, organic insulators, plastic/resin/wax insulators, etc., and can solve problems such as limited effects

Inactive Publication Date: 2004-11-17
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This use of nitrogen-containing compounds alone to improve thermal stability is also effective, but to a limited extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0009] Example 1: Add glucomannan to pure wood pulp at 0.5% of dry pulp, and use ZQJ paper sampler to make 60g / m 2 Basis weight paper, predried to 30% (by weight) moisture. Compound glucomannan, melamine, and polyacrylamide in a weight ratio of 1:2:2, dissolve the auxiliary agent in water to a solid content of 10%, and apply the auxiliary agent to 25% of the dry pulp by brushing Add it to the insulating paper that has been pre-dried with moisture, and dry the moisture to obtain high-temperature aging-resistant insulating paper.

[0010] Carry out anti-high temperature aging test: put the above-mentioned insulating paper in a vacuum tube, insert copper wire in the vacuum tube to accelerate aging, seal the vacuum tube, heat up to 105°C and vacuum dry for 5 hours to drain the water, suck 25# transformer oil in The insulating paper was completely covered in the vacuum tube, heated to 150°C, and after 7 days of aging test, the obtained insulating paper was subjected to constant te...

example 2

[0011] Example 2: According to Example 1, no additives are added to the pure wood pulp, and it is copied to 60g / m with a ZQJ paper sampler 2 Quantitative pure wood pulp paper, pre-dried to contain 30% (weight) moisture, 1:1 weight ratio of melamine, polyacrylamide 10% solid content solution is added to the dry pulp by brushing 20% On the pre-dried paper, after the aging test, the mechanical properties tested are shown in Table 1.

example 3

[0012] Example 3: According to Example 1, the weight ratios of glucomannan, melamine, and polyacrylamide in the compounding auxiliary agent were adjusted to be 1:1:1, 1:4:4, and 1:6:6 respectively, and elemental analysis showed that Nitrogen content, after aging test, the tested mechanical properties are shown in Table 2.

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Abstract

In the present invention dextran is added into pure wooden pulp and the making paper is dried to certain degree, dextran is compounded with one or several nitrous compounds, and the mixture is added into the wet paper before drying. The insulating paper thus produced has excellent high-temperature aging performance, no pollution to transformer oil and no influence on the insulating performance of transformer oil.

Description

technical field [0001] The invention belongs to the application of an anti-high temperature aging additive in the production of transformer insulating paper. Background technique [0002] Pure wood pulp has good mechanical strength for transformer insulating paper, but after the transformer is put into operation, the insulating paper in it is in a higher temperature environment, the cellulose chains are gradually degraded and broken, and because the insulating paper is soaked in transformer oil , The transformer oil will decompose acid or other chemical components at high temperature and destroy the insulating paper. The two factors will greatly reduce the mechanical strength of the insulating paper. How to improve the performance of natural fiber paper and improve its heat resistance has been continuously published for many years. US2535960 uses acrylonitrile to modify natural fibers, and under the action of alkaline catalysts, cyanoethylated fibers are generated, so that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/12
Inventor 姚洁余寿明王公应周万维
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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