环氧化聚乙烯醇改性PAE湿增强剂的合成及作用机理

通过环氧化聚乙烯醇(PVA)对聚酰胺多胺环氧氯丙烷(PAE)湿增强剂进行改性,探讨了改性方式、改性剂的用量、改性树脂用量对纸张增强性能的影响。研究表明:PVA可以对PAE进行化学改性和物理改性,且化学改性优于物理改性。红外光谱图表明化学改性可以使PVA环氧化。GPC测定改性后的PAE树脂相对分子质量(简称分子量)为13508。SEM扫描电镜图显示,添加经环氧化PVA改性树脂的纸张,纤维间结合更紧密。当改性剂质量分数为16%,改性树脂添加量1%,与改性前相比,经环氧化PVA改性后的PAE树脂干增强指数提高了23.42%,湿增强指数提高了73.78%,耐折次数提高了201.10%,撕裂度提高了22.85%,耐破度提高了288.70%。

Study on synthesis and mechanism of modified poly(vinyl-alcohol) PAE wet strength agent on paper strengthening properties

Modified method of PAE wet strength agent with poly(vinyl-alcohol) with epoxy group, discussed the dosage of modifier, the amount of modified resin on paper to enhance the performance. The results show that PVA can conduct chemical and phyical modification recation of PAE wet strength agent, while chemical modification recation is the best process. What is more, PVA can be epoxided using chemical modification by means of Fourier transform infrared spectroscopy(FT-IR), the molecular weight of modified PAE resin is 13508 by GPC. The scanning electron microscopy(SEM) photographs show that binding force of paper fibers are enhanced significantly by modified PAE resin. The desired conditions for a better strength of paper are as follows: the mass fraction of modifier is 16%, the dosage of modified PAE resin is 1%. Compared with traditional modified PAE wet strength agent can further improve the paper dry tensile index by 23.42%, wet tensile index by 77.78% , folding resistance degree increases by 201.10%, tearing index increases by 22.85%, the burst index increases by 288.70%.