摘要
研究了BCTMP中DCS对阳离子聚丙烯酰胺和聚乙烯亚胺助留效果的影响,并使用果胶酶处理DCS,比较了酶处理前后DCS对阳离子助剂的作用效果。结果表明,机械浆中DCS特别是溶解物质DS能够明显降低阳离子聚丙烯酰胺的助留效果,随着DCS浓度的增加,细小纤维的留着率降低。高电荷密度的聚乙烯亚胺的加入能够中和DCS中的阴离子垃圾,提高阳离子聚丙烯酰胺的助留效果。果胶酶能够降解DCS中产生阴离子垃圾的主要物质果胶酸。DCS经果胶酶处理后,阳电荷需要量明显降低。与不用果胶酶处理相比,果胶酶处理后的DCS对聚丙烯酰胺助留效果的有害影响减小,细小纤维的留着率明显上升。
The effects of dissolved and colloidal substances （DCS） in BCTMP and their treatment with pectinase on the efficiency of cationic polyacrylamide（CPAM） and polyethyleneimine（PEI） were studied. The results showed that DCS especially dissolved substances（DS） was deleterious to the efficiency of CPAM, and the retention of fine decreased with the increase of concentration of DCS. PEI with high cationic charge density could neutralize the anionic trash in DCS and improve the efficiency of CPAM. Pectic acid which was believed as the main source of anionic trash could be degraded by pectinase, and the anionic trash of DCS reduced obviously after pectinase treatment. Compared to the DCS without pectirrase treatment, the negative effect of DCS treated with pectinase on the efficiency of cationic polymers reduced and the retention of fines increased. The treatment of mechanical pulps or white water of paper mills with pectinase was believed to be an effective method for the improvement of retention of fines and saving of cationic polymers.
出处
《中国造纸》
CAS
北大核心
2006年第8期23-26,共4页
China Pulp & Paper
基金
教育部博士点基金资助项目(编号20040561003)
