油浸式绝缘纸纸浆纯化工艺的研究

Study on Purification Process of the Pulp for Oil-impregnated Insulating Paper

关键词:  酸处理  洗涤  镁盐  电气性能

Key Words:acid treatment  washing  magnesium salt  electrical performance

摘要:探究了酸处理后纸浆出现的问题及添加镁盐对纸浆和成纸性能的影响，并对酸处理后洗涤方式进行了研究。结果表明，酸用量为1%时，就会引起纸浆水抽提液电导率偏高，pH值偏低的问题，且通过增加洗涤段数未能改善，改变洗涤方式后效果并不明显，而酸处理后的纸浆再经镁盐处理可以有效解决这一问题；随着镁盐用量的增加，纸浆水抽提液电导率降低，pH值增加；同时对1%盐酸+2.5%镁盐处理后的纸样进行离子含量和电气性能检测，检测结果显示，与未处理的纸样相比，成纸灰分中钠离子含量降低，击穿强度增加，介质损耗降低。

Abstract:In this work， the acid solution was used to purify the pulp after cooking.The problem of the pulp after acid treatment and the effect of adding magnesium salt on the properties of pulp and paper were studied. The results showed that when the amount of acid in the purification process was 1%， the conductivity of the water extraction liquid was high and the pH was low.The problem could not be solved by increasing washing times.The problem was improved by changing the washing way， but ash content of the pulp increased after replacing with tap water washing. Treating the pulp with magnesium salt after acid treatment could effectively solve this problem， and the conductivity of aqueous extract of the pulp was decreased， and the pH value increased with the increasing of magnesium salinity.Adding 2.5% magnesium salt to the pulp which was treated with 1% acid solution， the ionic and electrical properties of paper samples were tested. Test results showed that compared with untreated paper，the sodium content in the ash of the paper reduced， the breakdown strength increased and the dielectric loss reduced．