Abstract:Latices of acrylate copolymer resin (ACR) with the particle size about 200 nm and relatively narrow distribution was prepared through emulsion polymerization with butyl acrylate and methyl methacrylate as monomer, 1,4-butanediol dimethacrylate as crosslinker, allyloxmethyl nonylphenol ether sulfates as reactive emulsifier, and polystyrene latex as seed latex. Then, high impact polyvinyl chloride was obtained through acrylate latex in situ suspension graft copolymerization with vinyl chloride and blending. The structure and morphology of ACR-g-PVC were characterized by infrared spectroscopy, differential scanning calorimeter and scanning electron microscope. Effect of kinds of ACR latices, which were prepared at different temperatures of emulsion polymerization, on mechanical properties of ACR-g-PVC resin, and effect of ACR latex feeding sequence on stability of suspension polymerization, morphology and mechanical properties of ACR-g-PVC resin were investigated. The results show that PVC composite resin is composed of copolymer formed by vinyl chloride grafting on the ACR, homopolymer of vinyl chloride and ACR. Impact strength of PVC composite resin is improved remarkably by suspension graft copolymerization of ACR latex and vinyl chloride. When the mass fraction of ACR latex is 6.0%, the notched impact strength of the ACR-g-PVC resin is 7.4 times that of unmodified SG-5 PVC resin. Besides, if ACR latex is added after vinyl chloride monomer is dispersed well in situ suspension polymerization, the particle shape and impact strength of ACR-g-PVC resin are better than those of ACR latex added before. The most important thing is that no sticking kettle and shaft problem are found.