| Abstract:Employing solid particles to stabilize emulsion can reduce the adverse effects of surfactants on ASA sizing performance. In this paper, ASA emulsion was stabilized by Laponite, and chitosan was applied to enhance the sizing performance of the as-prepared ASA emulsions. The influences of chitosan addition on the stability and sizing performance of ASA emulsion were investigated. The effects of aluminum sulfate dosage and value of the pulp slurry pH on the sizing performance of ASA emulsion, as well as the stability of ASA emulsion were analyzed. The results indicated that, the addition of chitosan could slightly reduce the stability, i.e. increased the released water of ASA emulsion after standing for 24 h, but improved the coalescence and creaming stability and sizing performance of Laponite stabilized ASA emulsion. A small quality of aluminum sulfate could significantly enhance the sizing performance of ASA emulsion. ASA emulsion had the best sizing performances at pH 7, but performed well from pH 5 to pH 9. When the storage time of the ASA emulsion was over 120 minutes, the sizing degree only reduced by 10%, indicating a rather good hydrolysis stability of the emulsion. |
