丙烯酸酯改性水性聚氨酯乳液的合成及胶膜性能研究

Study on the Synthesis of Acrylate Modified Aqueous Polyurethane Emulsion and Film Properties

摘要:

以异佛尔酮二异氰酸酯（IPDI）、聚碳酸酯二醇（PCDL）、二羟甲基丙酸（DMPA）三乙胺（TEA）、甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）为原料，采用原位乳液聚合法制备水性聚氨酯-丙烯酸酯（WPUA）复合乳液。考察了聚氨酯（PU ）含量、m(MMA):m(BA)、初始-NCO与-OH物质的量之比等因素对WPUA复合乳液及其胶膜性能的影响。结果显示，当w(PU)质量分数为80%、初始n(-NCO):n(-OH)=6.0、w(DMPA)=5%、m(MMA):m(BA)=4:6时，所得WPUA乳液性能稳定，其胶膜吸水率降低至9.80%，相比较未改性的聚氨酯胶膜的吸水率24.75%，其吸水率降低了60.4%；改性胶膜的拉伸强度达到28.9MPa，是未改性聚氨酯胶膜的1.53倍，制备出了性能稳定、具有优异耐水性和物理机械性能的WPUA复合乳液。

Abstract:

With IPDI, PCDL,DMPA,TEA,MMA and BA as the basic raw materials, hybrid emulsion of waterborne polyurethane-acrylate(WPUA) was prepared by in-situ emulsion copolymerization method in this paper. The effects of PU content, quality ratio of MMA and BA, the n(-NCO)/n(-OH) and the amount of DMPA on the properties of the emulsion and coating film were systematically studied. The results showed that when the PU quality score was 80%, the initial molar ratio of the -NCO and -OH value was 6.0,using DMPA mass fraction at 5%, and the m(MMA):m(BA) at 4:6, the WPUA hybrid emulsion showed a stable performance.Compared with the bibulous rate of 24.75% of the unmodified PU film,the water absorption of the WPUA film was reduced by 60.4%,reaching to 9.80%,and the tensile strength of the modified film increased by 1.53 times of the PU film,reaching to 28.9MPa.All the results show that the stable WPUA emulsion was prepared,and it exhibits superior performance properties in water resistance and physical and mechanical properties.