聚氨酯化改善纸张物理性能的研究  

Modification of Paper with Polyurethane

作　　者：李佩燚[1] 王志杰[1] 李鸿魁[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：《中国造纸学报》2006年第1期39-42,共4页Transactions of China Pulp and Paper

摘　　要：研究了异佛尔酮二异氰酸酯(IPDI)对纸张聚氨酯化处理的方法。通过多媒体电子显微镜和傅里叶变换红外光谱,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,不同浆料经过聚氨酯化处理后,其强度提高的顺序为:棉浆>针叶木浆>阔叶木浆>苇浆。当棉浆打浆度为73°SRI、PDI用量12%、反应时间10 min,反应温度60℃时,聚氨酯化后纸张的裂断长提高58.40%,湿强度为干强度的50.61%,耐折度为原来的13.4倍,耐破指数增加67.73%,撕裂度下降55.91%。通过IR光谱分析IPDI对纸张的增强作用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 with the reaction of isophorone diisocyanate （IPDI） and paper were investigated. The combination of multimedia microscope and IR analysis was used to analyze the chemical and physical characteristics of the polyurethane derived from paper and the forming mechanism of the polyurethane structure. The strength of the polyurethane derived from paper is different depending on the pulps used, the order of strength from high to low is cotton pulp, softwood pulp, hardwood pulp and reed pulp. When cotton pulp is used and its beating degree is 73°SR, dosage of IPDI is 12%, reaction time 10 rain and temperature 60℃, the breaking length of the resultant product increases by 58.40%, and wet strength/dry strength is 50.61%, folding endurance increases 12.4 times, burst index increases by 67.73%. It is found that carbonate bond is formed between IPDI and cellulose of the fibers when the paper is treated with IPDI. The hydrogen bond can be changed into chemical bond and the paper＇s physical strength, especially the wet strength is enhanced through this treatment.

关 键 词：聚氨酯化 IPDI 打浆度 物理性能 

分 类 号：TS727[轻工技术与工程—制浆造纸工程] TS714