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2 H,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-si-tu polymerization.The influence of content of KH550 on properties of the WPUA emulsion and its film’s prop-erty 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 in-strument(DLS),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(KH550)=1.05%.Additional,the film was en-dowed with flat and regular coating surface,the pencil hardness of the film reached 2 H,adhesive force grade reached the 0 level,and the water absorption was 8.57%,the impact resistance was up to GB/T1732-93.
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