高醚化三聚氰胺甲醛树脂交联水性聚氨酯的制备与表征

合成了高醚化三聚氰胺甲醛树脂(HMMM)交联改性含聚乙二醇单甲醚(Ymer N120)亲水基团的阴离子型水性聚氨酯。 通过全反射红外(ATR-FTIR)、差示扫描量热仪(DSC)、电子拉力机等技术手段表征了改性后的水性聚氨酯胶膜结构、热性能和力学性能。 结果表明,随着HMMM质量分数的增加,聚氨酯胶膜中氢键相互作用减弱,胶膜耐热性、耐水性、拉伸强度、粘接性均有所提高;当HMMM为8%时,聚氨酯胶膜的拉伸强度增加了125%,T-型剥离强度增加了7.4 N/cm,硬段最大热分解速率对应温度增加了38 ℃。 此外,交联水性聚氨酯胶膜的耐水性也得到了很大程度的提高。

Preparation and Charaterization of Hexakis(methoxymethyl)melamine Crosslinking Waterborne Polyurethane

Hexakis(methoxymethyl)melamine(HMMM) was used to cross-linking modify anionic waterborne polyurethane with methoxypoly ethylene glycol side chain(Ymer N120) to improve the performance of polyurethane, such as, heat resistance, water resistance and mechanical properties. The structure, thermal properties and mechanical properties of the films were characterized by attenuated total reflectance Fourier transform infrared spectroscopy(ATR-FTIR), differential scanning calorimeters(DSC), and tensile machine. The results show that with the increase of the mass fraction of HMMM, hydrogen bonding interaction of NH groups is weakened, while the heat resistance, water resistance, tensile strength, adhesiveness of polyurethane are all improved in a certain extent. When the mass fraction of HMMM is 8%, the tensile strength of composite materials increases by 125%, T-type peel strength increases by 7.4 N/cm,temperature of hard segment's maximum thermal decomposition rate increases by 38 ℃. In addition, the water resistance of crosslinking waterborne polyurethane film has been greatly improved.