中文摘要：

通过乳液型双酚A环氧树脂（BAE）对聚乙烯亚胺（PEI）进行改性,制备出了具有强阳离子性和反应活性的改性PEI纸张增强剂。讨论了增强剂组成、添加量和助留剂添加量等因素对纸张强度的影响,并用SEM对纸样微观结构进行了表征。结果表明,BAE树脂的引入可增加聚乙烯亚胺分子与纸纤维的结合强度,改性PEI可使纸张湿强度从14.46%提高到21.65%,环压指数提高42%;SEM分析表明,纸张断裂是由纤维断裂引起的,为改性PEI可增加纤维间的结合强度提供了依据。

英文摘要：

A kind of cationic paper strength agent was prepared through the modification of polyethylene imine（PEI） with bisphenol A epoxy resin（BAE） emulsion.The influence of composition,additive amount and retention aid of cationic modified PEI on paper strength was discussed and the microstructure of paper sheet was characterized by scanning electron microscope（SEM）.The results showed that the bonding strength between PEI and paper fiber was increased,the wet strength enhanced from 14.46% to 21.65%,and the ring crush index improved by 42% with the addition of modified PEI.SEM analysis indicated that paper fracture was caused by fiber breakage,which provided basis for the fact that the modified PEI can increase interfiber-bonding strength.