中文摘要：

以IPDI为硬段,PTMG1000为软段,TMP为交联剂,APTES为封端剂,合成了一系列硅烷偶联剂改性水性聚氨酯乳液,并制备了水性聚氨酯的固化膜。FT-IR分析表明,APTES上的—NH2与聚氨酯的端—NCO发生反应,成功地将硅烷结构引入聚氨酯分子中。TG分析表明,APTES的改性,提高了聚氨酯的热稳定性。随着w（APTES）增大,改性聚氨酯膜的拉伸强度增大,断裂伸长率减小,耐水性和耐溶剂性增强。TEM显示聚氨酯乳胶粒呈球形。随着w（APTES）增大,乳液粒径增大,薄膜的接触角增大。改性聚氨酯涂膜铅笔硬度达2H,摆杆硬度达0.73,耐冲击合格。

英文摘要：

A series of waterborne polyurethane modified by silane coupling agent were prepared with isophorone isocyanate as hard segment,polyether polyol as soft segment,trimethylol propane as crosslinking agent and 3-aminopropyltriethoxysilane（APTES） as end capping agent for polyurethane prepolymer.The films of waterborne polyurethane were prepared.Mechanical properties,water contact angle and water resistance of the films were measured.The particle size and distribution of the emulsion was tested by dynamic laser light scattering（DLS）.FT-IR indicates that APTES reacted with —NCO of polyurethane.Thermogravimetry analysis indicates that modification of APTES for polyurethane increased thermal stability of polyurethane.It was found that tensile strength of modified polyurethane increased and the elongation at break decreased with increasing w（APTES）,water and solvent resistance increased.TEM manifested emulsion particles are spherical.DLS showed that particle size of emulsion increases with increasing w（APTES）.Pencil hardness of modified polyurethane films can reach 2H,pendulum hardness is 0.73 and impact resistance meets GB/T1732-93.