高固含量改性PAE湿强剂的制备及性能研究

Study on preparation and properties of modified wet strength agent PAE with high solid content

实验以二乙烯三胺和己二酸为原料合成聚酰胺多胺中间体,将其中间体与环氧氯丙烷通过支化交联,并加入γ-缩水甘油醚氧丙基三甲氧基硅烷(KH-560)进行改性,制备出固含量为30%、湿强度为27.50%的改性聚酰胺多胺环氧氯丙烷(PAE)湿强剂.研究表明,n(二乙烯三胺)∶n(己二酸)=1.05∶1,高温缩聚反应温度为155℃,反应时间为5h,催化剂ω(浓H2SO4)=1%时能获得脱水率高、黏度适宜的中间体;交联化反应中n(环氧氯丙烷)∶n(二乙烯三胺)=1.4∶1,反应温度为60℃,时间为3h,ω(KH-560)=1.9%时制备的改性PAE湿强剂在干、湿抗张指数、湿强度、耐折度及稳定性优于传统未改性的PAE湿强剂;SEM扫描电镜图显示,加入改性PAE湿强剂的纸张比空白样品的纤维结合更紧密.

The experiment studied with two three vinyl amine and adipic acid as raw material to prepare polyamide polyamine intermediate.While the intermediates and epichlorohydrin are branching and cross linking with the addition of r-Glycidoxypropyltrimethoxysilane（KH-560）,which could synthesize new type modified PAE with the solid content of 30%,the wet strength of 27.50%.The results show that the best synthesis conditions of polyamide-polyamine epichlorhgdrin（PAE）resin is：n（two three vinyl amine）∶n（adipic acid）=1.05∶1,the temperature of synthesis of PPC heated to 155 ℃,reaction for 5h,the addition of catalyst toω（H2SO4）=1%,which can obtain the high dehydration rate,suitable viscosity polycondensation reaction;the conditions of synthesis of PAE are n（epichlorhgdrin）∶n（two three vinyl amine）=1.4∶1,the temperature heated to 60 ℃,reaction for 3 h,ω（KH-560）=1.9%.At that time,the product of modified PAE is superior to the conventional unmodified PAE on the dry tensile index、wet tensile index、wet strength、folding resistence degree and stability;the scanning electron microscopy（SEM）photographs show that compared with blank sheet,binding force of paper fibers are enhanced significantly by modified PAE wet strength agent.