交联型聚乙烯醇表面施胶剂的制备及作用机理

Preparation and Mechanism of Cross-linked Polyvinyl Alcohol Surface Sizing Agent

关键词:  交联  聚乙烯醇  有机偶联基团  表面施胶  耐折度

Key Words:cross-linking  polyvinyl alcohol  organic coupling group  surface sizing  folding endurance

摘要:采用γ-缩水甘油醚氧丙基三甲氧基硅烷（KH560）对聚乙烯醇（PVA1799）进行接枝改性，制备了交联型聚乙烯醇表面施胶剂（PVA-KH560）；通过傅里叶变换红外光谱、氢核磁共振谱及稳定性测试等对PVA-KH560结构及稳定性进行分析，并对PVA-KH560与PVA1799复配施胶前后纸张的物理性能进行了分析。结果表明，KH560中的环氧基团在PVA-KH560中消失，含硅支链成功接枝到PVA1799长链中；当m（PVA1799）∶m（KH560）=9∶1.5时，PVA-KH560稳定且粒径最小（122.2 nm），分散性指数为0.291；和原纸相比，复配施胶纸张耐折度、抗张指数、挺度、撕裂指数、耐破指数分别提高了436.0%、60.1%、116.4%、89.9%、80.5%，接触角增大了57.7%，综合性能优于单独使用PVA1799的施胶纸。

Abstract:A cross-linked polyvinyl alcohol surface sizing agent （PVA-KH560） was prepared by grafting and modifying polyvinyl alcohol （PVA1799） using γ-glycidyl ether oxypropyltrimethoxysilane （KH560）.The structure and stability of PVA-KH560 were analyzed by Fourier transform infrared spectroscopy， hydrogen nuclear magnetic resonance spectroscopy， and stability tests， and the physical properties of papers before and after sizing by the compound agent of PVA-KH560 and PVA1799 were compared. The results showed that the epoxy group of KH560 disappeared in PVA-KH560， and the silicon-containing branch chain was successfully grafted into the PVA1799 long chain. When m （PVA1799）∶m （KH560） was 9∶1.5， the PVA-KH560 dispersion was stable and had the smallest particle size （122.2 nm）， and the PDI index was 0.291. Compared with the base paper， the folding endurance， tensile index， stiffness， tearing index， and bursting index， and contact angle of the compound-agent sized paper increased by 436.0%， 60.1%， 116.4%， 89.9%， 80.5%， and 57.7%， respectively， showing an improved comprehensive performance compared with the PVA1799 sized paper.