For improving environmental friendliness,cationic styrene-acrylate emulsion sizing agent was modified by chitosan and gelatin,and chitosan dosage was determined to be 0.35%of the weight of cationic styrene-acrylate emulsion sizing agent,while gelatin dosage was not more than 0.35%.Meanwhile,effect of gelatin dosage on the stability,dispersion,surface tension and solid content of modified cationic styrene-acrylic emulsion sizing agent were studied,and the results showed that the sizing agent had high static stability and centrifugal stability,stable pH value and significant change of solid content,while the changes of surface tension and paper whiteness were not obvious.
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