A kind of preparation method of modified cellulose insulating paper

Abstract

The invention relates to a preparation method of modified cellulose insulating paper, and belongs to the technical field of preparation of insulating materials. The preparation method comprises the steps of: firstly adopting micro-explosion to generates a pressure difference inside fiber during pressurization and instantaneous pressure releasing under the condition of maintaining intrinsic physical mechanical properties and complete appearance of birch fiber so as to form high-pressure airflow which impact from inside to outside inside the birch fiber, destroying cell walls, pit membranes andother weak tissue of the birch fiber so as to achieve preliminary fiber degradation, then mixing the obtained fiber after preliminary fiber degradation is conducted with tartaric acid, performing cooking at high temperature and high pressure, carrying out beating and oxidizing to obtain modified paper pulp, then utilizing a reaction of sodium silicate, hydrochloric acid and aminopropyl triethoxy silane so as to prepare modified nano silica, mixing the modified nano silica with the modified paper pulp, then carrying out papermaking, and performing a hot pressing reaction to obtain the modifiedcellulose insulating paper. The obtained insulating paper has good insulation performance, high mechanical strength and a broad application prospect.

Description

technical field [0001] The invention relates to a preparation method of modified cellulose insulating paper, belonging to the technical field of insulating material preparation. Background technique [0002] Most of the current large-scale power transformers are oil-immersed power transformers, and their insulation is mainly a solid-oil insulation structure composed of oil, paper, cardboard and other solid insulation. Oil-paper insulation is a typical solid-liquid composite insulation in transformers, and its performance plays a decisive role in the long-term safety and reliability of transformers. Higher and higher voltage levels and miniaturization require that the insulating medium must have higher dielectric strength and mechanical strength, and the traditional oil-paper composite insulation has become more and more difficult to meet the requirements. [0003] Cellulose insulating paper is one of the most widely used internal insulating materials in oil-immersed power t...

AI Technical Summary

Problems solved by technology

[0005] The main technical problem to be solved by the present invention is that the traditional cellulose insulating paper is used in the actual transformer. The insulating paper is subjected to high-intensity electric field stress for a long time, and its mechanical and insulating properties are still poor, so it is difficult to use for a long time and affects the working life. Defects, a preparation method of modified cellulose insulating paper is provided