Study on preparation of alcohol-acid crosslinking type acrylate emulsion

With butyl acrylate(BA),methyl acrylate(MA) and acrylonitrile(AN) as main materials,alkyl phenol polyoxyethylene ether(OP-10) and sodium dodecyl sulphonate(SDS) as composite emulsifier,sodium bisulfite(NaHSO3)and ammonium persulfate(APS) as redox initiator,so a new acrylate emulsion was prepared by seeded emulsion polymerization.Then an alcohol-acid crosslinking type acrylate emulsion(namely heat-crosslinking system without formaldehyde) was prepared with polyol A as cross linker and modifier of the acrylate emulsion.The results showed that the acrylate emulsion had well combination property when polymerization temperature was 70 ℃,mass ratio of m(BA)∶m(MA)∶m(AN) was 33∶11∶6,mass fractions of initiator and composite emulsifier were 2.4% and 5% respectively,and mass ratio of m(OP-10)∶m(SDS) was 1∶1.5.The solid content and monomer conversion rate of crosslinking modified acrylate emulsion were 51.40% and 98.3% respectively when molar ratio of n(acrylic acid)∶n(polyol A) was 30∶1 and mass fraction of acrylic acid was 1.0%.The water absorption of crosslinking modified acrylate emulsion film(10.08%) was 82.4% less than that of unmodified acrylate emulsion,but their thermal stabilities were higher and nearness.