Study on properties of the(PU+PA)/PVC composite resins prepared via copolymerization of polyurethane-polyacrylate hybrid emulsion and vinyl chloride
Anionic water borne polyurethane (PU) emulsion was prepared with toluene diisocyanate (TDI),polypropylene glycol (PPG) and dimethylol propionic acid (DMPA) by prepolymer dispersing process using triethylamine as neutralizer.Polyacrylate(PA)emulsion was prepared from butyl acrylate (BA) by emulsion polymerization technique.Then it was blended with PU emulsion to prepare polyurethane-polyacrylate (PU+PA) hybrid emulsion.In the presence of the (PU+PA) hybrid emulsion,the (PU+PA)/PVC composite resins were obtained by in-situ emulsion copolymerization in an autoclave.The properties of the (PU+PA)/PVC composite resins were determined via electronic universal tesring machine,impact tester,TA-2000-type thermal analyzer and Vicat needle apparatus,respectively.The fractured morphology of the composite resin materials was characterized by scanning electron microscopy.The study results showed that the heat resistance and impact strength of the composite resins were improved when the PA with excellent heat stability was added in.When the proportion of PA and PU prepared from 3000 molecular weight of polypropylene glycol was 4/6,the notched impact strength of the (PU+PA)/PVC composite resin was the greatest.
waterbome polyurethanehybrid emulsioncomposite resinPVC modified by copolymerization
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万方数据
维普
