水性聚氨酯表面施胶剂的合成及其应用研究

摘要

Waterborne polyurethane (WPU) as a new surface sizing agent has been developed in recent years. WPU surface sizing agent was prepared by a pre-polymerization process. The waterproof property, surface property and mechanical properties of the paper sized by WPU with different NCO/OH molar ratio, different DMPA contents and different molecular structure were systematically examined. The results showed that water resistance of the papers sized with the WPU surface sizing agent dramatically increases. For example, Cobb value only 25. 8％ of the papers without surface sizing, surface gloss is 10 times to the unsized papers, at the same time, smoothness of the papers sized with WPU surface sizing agent can be 7 times high as the unsized papers. The folding endurance and tensile strength also increase obviously.WPU is a kind of surface sizing agent with wide application prospects.%水性聚氨酯(WPU)是近些年发展起来的一种新型表面施胶剂.通过预聚体法制得水性聚氨酯表面施胶剂,研究了n(NCO):n(OH)、二羟甲基丙酸(DMPA)含量以及分子结构对WPU施胶纸张抗水性能、表面性能以及强度性能的影响.结果表明,WPU施胶纸的抗水性能大幅度提高,Cobb值是未施胶纸的25.8%;光泽度是未施胶纸的10倍以上;平滑度是未施胶纸的7倍;耐折度、抗张指数也有一定的提高.WPU是一种具有广阔应用前景的表面施胶剂.