聚氨酯化对纸张性能的影响及其机理  

Effect and Mechanism of Polyurethane Treatment on Paper

作　　者：王志杰[1] 李佩燚[1] 

机构地区：[1]陕西科技大学造纸工程学院,陕西咸阳712081

出　　处：《纸和造纸》2006年第1期48-52,共5页Paper and Paper Making

摘　　要：研究了甲苯-2,4二异氰酸酯(TDI),异佛尔酮二异氰酸酯(IPDI)对纸张聚氨酯化处理的方法及反应机理。采用多媒体电子显微镜和傅立叶变换红外光谱分析相结合的方法,分析了所合成的聚氨酯材料的物理性能及聚氨酯结构的形成机理。研究结果表明:当TDI用量10％,反应时间10min,反应温度60℃时,聚氨酯化后纸张裂断长提高了 21．55％,湿强度为干强度的41．61％,耐折度提高了1．6倍;当IPDI用量12％,反应时间10min,反应温度60℃时．聚氨酯化后纸张的裂断长提高54．88％,湿强度为干强度的41．19％,耐折度提高了4．1倍。TDI和IPDI对纸张的增强作用通过 IR光谱分析都是由于纸张聚氨酯化后生成氨基甲酸酯结构,使得纤维之间存在有较多的聚合物起架桥作用．把纤维间的氢键结合转化为化学键结合,从而增强纤维之间的连接,提高纸张强度,尤其是湿强度。The methods of synthesizing polyurethane （Toluene, 2, 4-diisocyanate TDI and Isophorone diisocyanate IPDI） with paper were investigated. The combination of multimedia microscope and IR analysis were used to analyze the chemical and physical characteristics and forming mechanism of the polyurethane derived from paper. On the conditions of dosage of TDI 10%, reaction time 10 min and temperature 60℃, breaking length is elevated by 21.55%, folding strength is raised by 1.6 times, and wet strength/dry strength is 41.61%; when dosage of IPDI 12%, time 10 min and temperature 60℃, breaking length is heightened by 54.88%, folding strength is enhanced by 4.himes, and ratio of wet strength and dry strength is 41.19%. It was found that carbonate bond was formed between TDI and IPDI with cellulose in fibers when the paper was treated with TDI or IPDI. The treatment can change hydrogen bond into chemical bond and enhance the paper＇s physical strength, especially the wet strength.

关 键 词：聚氨酯化 TDI IPDI 纤维素 

分 类 号：TS727.2[轻工技术与工程—制浆造纸工程]