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将聚胺固着剂(PA)、阳离子聚丙烯酰胺助留剂(CPAM)单独以及协同处理旧新闻纸浆,采用聚焦光束反射测定仪(FBRM)考察浆料中残余胶体粒子的数量、尺寸和尺寸分布,探讨固着剂/助留剂协同控制纸浆中溶解与胶体物质(DCS)的效果和机理.结果表明,PA单独处理纸浆时,会产生部分不能固着于纸张纤维或不被纤维网络截留的粒子聚集体;CPAM单独处理纸浆时,其电荷容易被DCS中和,导致其减少纸浆胶体粒子数量的效果明显下降,但不产生粒子聚集体;PA/CPAM协同处理纸浆时,后续的CPAM处理能将PA预处理纸浆时产生的部分粒子聚集体进一步固着到纸张纤维上,达到更好地降低胶体粒子数量的效果,且不产生更大的粒子聚集体.“,”A polyamine (PA) fixing agent,and a cationic polyacrylamide (CPAM) retention aid are used individually as well as in combination to treat the old newsprint pulp,and the focused beam reflectance measurement (FBRM) is used to measure the quantity,the size and the size distribution of the colloidal particles in the pulp filtrate,to reveal the combinative effect of the fixing agent and the retention aid on the controlling of the dissolved and colloidal substances (DCS) in the papermaking pulp raw material.It is indicated that when the PA is used singly to treat the pulp,some colloidal agglomerates will be formed which are not fixed with the fiber or not trapped in the fiber mat,thus they reside in the pulp filtrate;when the CPAM is used singly,its charge will be neutralized easily by the DCS,therefore,its ability to reduce the quantity of colloidal particles in the pulp will be weakened greatly,and larger colloidal agglomerates will not form;when the PA and the CPAM are used in combination,those agglomerates formed by the PA but resided in the aqueous phase will be further retained onto the fiber by the CPAM,in this course,the quantity of the colloidal particles will be reduced and larger colloidal agglomerates that form in the PA treatment will not form.