通过硅烷偶联剂（KH560）对聚乙烯亚胺（PEI）进行改性制备了一种新型环保湿强剂。采用FT-IR、TG、SEM和Zeta电位仪对改性PEI进行结构表征和性能测试，并分析其与聚酸胺多胺环氧氯丙烷树脂（PAE）联用的增强效果。结果表明，将改性聚乙烯亚胺（PEI-KH560）湿强剂应用于纸张浆内施胶，当添加质量为绝干浆质量的1.6%、助留剂CMC质量分数为0.6%时，纸张的湿抗张指数达到17.42 N·m/g，相对未加入湿强剂试验干抗张指数提高了58.4%，撕裂指数提高了26.4%。与单独使用改性产品相比，PEI-KH560与PAE等质量比联用的湿抗张指数提高23.8%，耐折度提高50.1%。

A kind of new environmental-friendly wet strength agent is prepared by modifying polyethyleneimine (PEI) with a silane coupling agent (KH560).FT-IR,TG,SEM and Zeta potentiometer are employed to characterize and test the structure of modified PEI,and analyze its effect on paper strength when it is used in conjunction with polyamine epichlorohydrin resin (PAE).Analysis and testing results show that as PEI-KH560 is applied to the internal sizing of paper pulp with an addition amount of 1.6% relative to the absolute dry pulp and the addition amount of CMC is 0.6%,the wet tensile index of the paper reaches 17.42 N·m·g^-1,representing an increase of 58.4% compared with the dry tensile index of the blank paper sample;and the tear index increases by 26.4%.Compared with the addition of PEI-KH560 alone,the wet tensile index of the paper increases by 23.8% and the folding endurance increases by 50.1% when modified PEI-KH560 and PAE are used together in an equal mass ratio.

孙芮君(1993-),女,硕士研究生,研究方向为造纸工业,729705814@qq.com