于红梅 刘群华 曹春昱 刘文 陈雪峰

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+25%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。

关键词：酸处理；洗涤；镁盐；电气性能

中图分类号：TS7642文献标识码：ADOI：1011980/jissn0254508X201803006

收稿日期：20171218（修改稿）

基金项目：国家重点研发计划项目（2017YFB0308200）。

*通信作者：刘群华，高级工程师；主要从事特种的研究及开发。Study on Purification Process of the Pulp for Oilimpregnated Insulating PaperYU Hongmei1，2LIU Qunhua1，2，*CAO Chunyu1，2LIU Wen1，2CHEN Xuefeng1，2

（1China National Pulp and Paper Research Institute Co.， Ltd.， Beijing，100102；

2 National Engineering Lab for Pulp and Paper， Beijing，100102）

（*Email： tiger_lgh@sinacom）

Abstract：In this work， the acid solution was used to purify the pulp after cookingThe 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 lowThe problem could not be solved by increasing washing timesThe 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 salinityAdding 25% 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.

Key words：acid treatment； washing； magnesium salt； electrical performance

匝間绝缘纸是变压器中的重要绝缘材料，用于缠绕高低压绕组线圈上。在油浸式变压器中，油纸绝缘结构是最为常用的主绝缘，其可靠性直接关系到电网的安全与稳定[14]。目前各国输变电设备的发展方向是一致的：提高变压器电压等级与容量和可靠性，发展低损耗变压器，降低单位容量价格[5]。因此，对变压器匝间绝缘纸的性能提出了更高的要求，目前我国已突破500 kV、750 kV变压器匝间绝缘纸制备的关键技术，但1000 kV的特高压变压器绝缘纸仍依赖进口[6]。与国外进口纸相比，我国的变压器匝间绝缘纸的差距主要表现在纸的化学纯度低，电气性能差[7]，因此对于酸处理纯化过程中出现的问题及其对绝缘纸性能影响的研究十分必要。……