PUA／PVC复合乳液树脂的制备及表征

Preparation and Characterization of PUA/PVC Composite Emulsion Resin

采用甲苯二异氰酸酯(TDI)、聚醚(PPG)和二羟甲基丙酸(DMPA)合成了自乳化阴离子水性聚氨酯(PU),以此为种子制备了聚氨酯／聚丙烯酸酯(PUA)复合乳液,接着在高压釜中进行氯乙烯原位接枝共聚,制备了聚氨酯／聚丙烯酸酯／聚氯乙烯(PUA／PVC)复合乳液树脂。采用激光粒度分析仪、透射电镜、动态热力学分析仪对复合材料的形态及动态力学性能进行了研究。结果表明:PUA／PVC复合胶乳粒子具有多核壳“海岛型”复合结构,经原位改性的PVC复合材料中的PUA橡胶相具有高度均匀的分散性。

The anionic water-borne polyurethane （PU） was obtained from toluene diisocyanate （TDI）, polypropylene glycol （PPG） and dimethlolpropionic acid （DMPA）, which was self-emulsified as seeds to further reacted with acrylates resulting in a polyurethane/polyacrylate hybrid emulsion （PUA）. Subsequently, the PUA emulsion was in-situ grafted with vinyl chloride in an autoclave generating an emulsion containing PUA/PVC composite latexes. The morphology and particle size distributions of the composite latexes were characterized using transmission electron microsopy （TEM） and a laser particle size analyzer and a multi-core/shell structure was identified. The solid samples were subjected to dynamic mechanical analysis （DMA）. TEM showed that the PUA rubber phase was uniformly dispersed in the PVC matrix.