Manufacturing method of meta-aramid raw paper with high insulating property

Abstract

The invention discloses a manufacturing method of meta-aramid raw paper with high insulating property. Meta-aramid chopped fibers and meta-aramid fibrids are used as raw materials; the manufacturing method comprises the following steps: defibering and mixing the meta-aramid chopped fibers and the meta-aramid fibrids according to a ratio; and preparing the meta-aramid raw paper through screen loading forming. The manfacuring method is characterized in that the meta-aramid fibrids are high-pulp degree fibrids, and the meta-aramid fibrids are subjected to beating treatment to form the high-pulp degree fibrids with the beating degree of 65-95 DEG SR and the specific surface area of 60 m < 2 >/g or above; and screen loading forming is formed by adopting a fourdrinier forming process of high-speed pulp flowing. According to the invention, the beating degree and the specific surface area of the meta-aramid fibrids are improved; a fourdrinier forming process of high-speed slurry flowing is adopted for forming; the high insulating property of the prepared aramid base paper is effectively improved, the electrical strength of the base paper is 12 kV/mm or above, the electrical strength afterhot pressing can reach 30 kV/mm or above, and the meta-aramid raw paper completely has the capacity of safely and stably operating for a long time in a motor or transformer electric field environmentof a high voltage class.

Description

technical field [0001] The invention relates to a method for making aramid paper, in particular to a method for making meta-aramid base paper with high insulation performance. The method for making meta-aramid base paper with high insulation performance can effectively improve the The electrical insulation performance of base paper belongs to the technical field of making aramid paper. Background technique [0002] Meta-aramid paper is a kind of aramid fiber paper. Meta-aramid fiber has become a kind of high-quality functional fiber due to its excellent high temperature resistance and insulation; the most prominent feature of meta-aramid paper is its resistance to High temperature, it can be used for a long time at 220°C without aging, its electrical and mechanical properties can be maintained for 10 years, and its dimensional stability is excellent. At about 250°C, its thermal shrinkage rate is only 1%; short It will not shrink, embrittle, soften or melt when exposed to a ...

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Problems solved by technology

[0008] Through the careful analysis of the above-mentioned patents, although these patents all involve the production method of aramid paper, some improved technical solutions have also been proposed. At the same time, the invention patent with the patent number CN201310233648. Meta-aramid paper and its preparation method, but through careful analysis, these patents still use the beating degree to be controlled at 30~60°SR, and the specific surface area is 30m 2 The production method of base paper within / g, and it is still proposed to preferentially adopt the inclined wire forming technology of special inclined wire former; although the invention patent of patent No. CN201310233648.9 proposes that "the online forming adopts fourdrinier, inclined wire or circular "net", but in fact, according to the beating degree and specific surface area of ​​the proposed slurry, it is not suitable to adopt the fourdrinier forming process, so the problems mentioned above will still appear in the actual application process, so further research and improvement are still needed