Synthesis and Application of Highly Cationic Starch-based Styrene-acrylate Copolymeric Emulsion for Papermaking
Soap-free emulsion polymerizations of styrene-acrylate surface sizing agent for papermaking were carried out using styrene(St),n-butyl acrylate(BA),and tert-butyl acrylate(tBA)as monomers,H2O2-FeSO4 as initiator,and a series of highly cationic starches(HCS)as emulsifiers.The effects of dosage,molecular weight(characterized by intrinsic viscosity),and degree of substi-tution of the HCS on the emulsion polymerization were discussed.A variety of methods were used to evaluate the physical and chemi-cal properties as well as the application performance of the emulsions.The prepared styrene-acrylate emulsion had a small average particle size of colloidal particles(126.2 nm),and strong positive charge properties(Zeta potential was 25.8 mV)and had excel-lent storage stability,when it was applied to corrugated base paper,the Cobb value of the sized paper was 21.6 g/m2,and the water droplet contact angle reached 121.6°.A mechanistic explanation for the reason why it could give paper better surface sizing effects was also provided.
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