The Study on the Preparation of Emulsifier-free Polyvinyl Acetate

The VAc/BA/AA ternary copolymer modified emulsion was prepared by semi-continuous seeded emulsion polymerization.Many effect factors of copolymerization were detected as indices of solid content and viscosity of modified emulsion.The results showed that the optimal craft condition were decided by the following conditions:mass fraction of AA was 5%in main monomerdosage;mass fraction of BA was 20%in main monomerdosage;mass fraction of protective colloid was 10% by weight of mixed monomer;mass fraction of initiator was 0.4% by weight of mixed monomer;mass fraction of complex emulsifierwas 3%by weight of mixed monomer.