KH550交联改性无溶剂聚氨酯/丙烯酸酯乳液的合成应用

Synthesis of KH550 crosslinking modified solvent-free polyurethane/polyacrylate emulsion

采用原位聚合法,合成了一系列γ-氨丙基三乙氧基硅烷(KH550)改性的无溶剂阴离子型聚氨酯/丙烯酸酯复合乳液(WPUA)。重点考察了KH550用量对WPUA乳液及涂膜性能的影响,通过红外光谱(FT-IR)、热重分析(TGA)、粒度分析仪(DLS)、原子力显微镜(AFM)、吸水率测试等对其相关性能进行了表征。结果表明,KH550反应到聚氨酯链段上且当m(KH550)=1.05%(占整个反应物总量,下同)时,WPUA乳液稳定性较好,平均粒径为104.5nm,其热稳定性也较佳,涂膜表面平坦且较规整,硬度可达2H,耐冲击性合格,附着力达到0级,吸水率低至8.57%。

A series of solvent free anionic polyurethane/polyacrylate modified by KH550 were prepared by in-situ polymerization. The influence of content of KH550 on properties of the WPUA emulsion and its film＇s property were systematically studied. The structure and related application performance of the WPUA emulsion was analyzed by fourier transform infrared（FT IR）, thermogravimetry analysis（TGA）, dynamic light scattering instrument（DI.S）, atomic force microscope（AFM）,water absorption test. The results show that KH550 reacted with -NCO of polyurethane. Furthermore,the average particle size of the WPUA emulsion was 104.5 nm and the film was endowed with excellent thermal stability when m（KHS50）=1.05%0. Additional, the film was en dowed with flat and regular coating surface, the pencil hardness of the film reached 2H,adhesive force grade reached the 0 level,and the water absorption was 8.57% ,the impact resistance was up to GB/T1732-93.