过碳酸钠对洋麻硫酸盐浆漂白效果的研究

摘要

对过碳酸钠(SPC)在洋麻硫酸盐浆中的漂白效果进行了研究,采用4因素3水平正交实验对其主要影响因素漂剂用量、温度、时间及用碱最进行了探讨.结果显示各因素对过碳酸钠漂白有不同程度的影响,极差分析显示温度对白度及黏度的影响最大,较优的漂白条件为:SPC用量3%(以H2O2含量计),用碱量1%,温度70℃.时间60min.过碳酸钠在洋麻硫酸盐浆OpQP和OpQDP漂序中的漂白能力略优于过氧化氢,而对纤维的降解程度相当.采用过碳酸钠的OpQDP漂序,终漂浆白度可达80%以上.%The bleachability of Hibiscus cannabines kraft pulp bleaching with sodium percarbonate (SPC) was studied.The key factors, including SPC dosage, bleaching temperature, time and active alkali charge, were investigated by orthogonal experiment.The results showed that the four factors have different effects on SPC bleaching, and the range analysis shows temperature has maximal effect on brightness and viscosity.The optimal bleaching condition could be proposed as follows: SPC charge 3％, alkali charge 1％ ,bleaching temperature 70℃ and time 60min.The bleaching performance of SPC is lightly better than hydrogen peroxide in OpQP and OpQDP sequences, then degradation effect on cellulose is similar, the brightness can reach to higher than 80％ISO when OpQDP bleaching sequence is employed.