Synthesis of sizing agent for acetate filaments

According to the structure of acetate fiber and the ″similar dissolve mutually″ theory,vinyl acetate(VAc),methacrylic acid(MAA)and butyl acrylate(BA) were chosen as monomers.After determining the polymerization system and reaction conditions,sizing agent for acetate filament was synthesized by adopting semi-continuous emulsion polymerization method.The solid content and viscosity of the sizing agents,conversion rate of monomers,and water resistance of the size film were tested.Single factor analysis was used to investigate the factors influencing polymerization and the optimal synthesizing process was determined.The structure of the sizing agent was characterized by FT-IR and the bundling property of the sized acetate filament was observed by SEM.Experimental results indicate that the sizing agent with best property is obtained when the mass mix proportion of monomers m(MAA)∶m(VAc)∶m(BA)=20∶70∶10,reaction temperature 70 ℃,stirring speed 300 r/min,the amount of initiator(APS,based on the total monomer) 0.75%,the amount of complex emulsifier(m(OP-10)∶m(SDS)=4∶1,based on the total monomer) 3% and dripping time 4 hours.