Abstract
Octadecenylsuccinic anhydride (ODSA) is an internal sizing agent used to hydrophobize paper and paper board in the process of papermaking. To prepare stable ODSA Pickering emulsions, montmorillonite clay-particles modified by γ-methacryloxy propyl trimethoxysilane (γ-MPTMS) were used as particulate emulsifiers of ODSA and water at room temperature. The effects of pH value, oil-to-water ratio, and particle concentration on the stability of the Pickering emulsions were investigated. The stability of ODSA emulsions in the presence of grafted-MMT first increased and then decreased as the pH value of the aqueous phase decreased. The critical pH for the phase separation of the ODSA emulsions was ∼7. Addition of ODSA oil induced phase inversion from an O/W emulsion to a W/O emulsion when the ratio of oil-to-water passed a specific threshold of 3:1 (Cp∼1.5wt%). The particle concentration was linked to the formation of particle films at oil–water interface and of clay particle networks in water phase. The ODSA emulsions stabilized by grafted-MMT could have good sizing performance and lifespan. This study on ODSA Pickering emulsions based on MPTMS-grafted MMT particles opens up a new route to the preparation of a variety of paper sizing agents in the papermaking industry.
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