| With the rapid development of home appliances and automotive industries inrecent years, higher demands for resin have been proposed, such as higher impactstrength, higher decomposition temperature, good wear resistance and sufficientstrength, etc. In order to meet the higher requirements of resin, impact modifier,namely toughening components need to be added.in the production process of resin.Impact modifier is according to the product demand design of different structures ofcopolymer of acrylate, styrene, butadiene, acrylonitrile and other monomers. In thisthesis, acrylic impact modifier with core-shell structure was prepared using butylacrylate as monomer. This thesis was divided into three sections as below..(a) High particle size of base PBS latex with composite structure was preparedwith butyl-acrylate(BA) and styrene(St) as the monomers, KPS as initiators, SDS asemulsifier and DAP as crosslinking agent, by seeded emulsion polymerization. Effectof initiators and emulsifying agents on the size of the latex and the amount ofcrosslinking agent on the solid content of the latex were investigated. And theinfluence of PS latex and BA monomer content on particle size of PBS latex werediscussed. The best conditions was also obtained for preparing high particle size ofbase PBS latex.(b) Then the excellent performance impact modifier with score-shell structurewere successfully synthesized by grafting styrene and acrylonitrile monomer ontobase PBS latex. To determine the optimum reaction conditions and obtain goodgrafting efficiency, the choice and quantities of the emulsifier and initiator of thesystem were examined. The structure of the impact modifier was characterized by IR.(c) Impact modifier were blended with SAN resin to test the impact strength andmelt flow rate of SAN resin. It was found that the mechanical properties mainlydepended on the particle size of base PBS latex. The blended material have a goodimpact strength when the particle size of base PBS latex is380-400nm. |
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