Polyimide compound type high-temperature-aging-resistant auxiliary agent, preparation method thereof, insulating paper and preparation method of insulating paper

A technology of polyimide and high temperature resistance, which is applied in the direction of anti-paper aging agent addition, non-polymer organic compound addition, paper, etc., which can solve the problem of unstable raw material source and quality, influence of additives on insulation performance, and ineffectiveness of nitrogen content And other issues

Active Publication Date: 2021-08-31
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1176271C is compounded with nitrogen-containing compounds such as glucomannan and melamine, which has good anti-high temperature and anti-aging effects, but there are three problems: (1) glucomannan is prepared from natural products, and the source and quality of raw materials are not good. Stable; (2) NaOH is used in the preparation process of glucomannan, which may bring sodium ions into the additives, which will affect the insulation performance of the additives; (3) Glucomannan is a polysaccharide that does not contain nitrogen itself , the nitrogen content of heat-resistant insulating paper is an important indicator, and the addition of glucomannan does not help to increase the nitrogen content of the paper

Method used

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  • Polyimide compound type high-temperature-aging-resistant auxiliary agent, preparation method thereof, insulating paper and preparation method of insulating paper
  • Polyimide compound type high-temperature-aging-resistant auxiliary agent, preparation method thereof, insulating paper and preparation method of insulating paper

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Mix polyimide, melamine and polyacrylamide in a weight ratio of 1:2:0.1, stir with water at 90°C for 2 hours to dissolve and disperse, add 20% of the absolute dry pulp into the beaten pure wood pulp and mix evenly, and copy it with a paper sample The extractor is copied to 60g / m 2 Quantitative paper is dried at 105°C for 10 minutes to obtain high-temperature aging-resistant insulating paper. The nitrogen content was tested by elemental analysis, and the mechanical properties tested by aging test are shown in Table 1.

Embodiment 2

[0039] Copy the pure wood pulp to 60g / m with a paper sampler 2 Weighted paper, pre-dried to 80% moisture. Dissolve and disperse polyimide, urea, and melamine in DMSO at 90°C for 2 hours in a weight ratio of 1:2:2, and add this additive to the pre-dried insulating paper by impregnating 10% of the dry pulp Dry at 105°C for 10 minutes to obtain high-temperature aging-resistant insulating paper. The nitrogen content was tested by elemental analysis, and the mechanical properties tested by aging test are shown in Table 1.

Embodiment 3

[0041] According to Example 2, polyimide, dicyandiamide, and melamine are dissolved and dispersed with chloroform at 90°C for 2 hours in a weight ratio of 1:2:2, and the additive is added by immersion at 10% of the dry pulp Put it on the pre-dried insulating paper, and dry it at 105°C for 10 minutes to obtain high-temperature aging-resistant insulating paper. The nitrogen content was tested by elemental analysis, and the mechanical properties tested by aging test are shown in Table 1.

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Abstract

The invention provides a polyimide compound type high-temperature-aging-resistant auxiliary agent, a preparation method thereof, and application of the polyimide compound type high-temperature-aging-resistant auxiliary agent in transformer insulating paper. According to the invention, a polyamine compound and a small molecule amine compound are compounded to obtain the high-temperature-aging-resistant auxiliary agent, the high-temperature-aging-resistant auxiliary agent is added to insulating paper in an adding, spraying, dipping or brushing manner, and finally drying is carried out. The insulating paper obtained by the preparation method provided by the invention has very good insulation performance and very good high-temperature aging resistance, and does not pollute transformer oil.

Description

technical field [0001] The invention belongs to the field of insulating materials, and in particular relates to a polyimide compound anti-high temperature aging additive, its insulating paper and a preparation method, and the application of the insulating paper in 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. [0003] How to improve the performance of natural fiber paper and improve its heat resistance has been continuously published for many years....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/14D21H17/07D21H17/37D21H17/51D21H17/55D21H19/10D21H19/12D21H19/14D21H19/30
CPCD21H21/143D21H17/55D21H17/51D21H17/37D21H17/07D21H19/30D21H19/12D21H19/14D21H19/10
Inventor 欧阳春姚结王公应陈学君张华胡静
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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