Environment-friendly compound surface sizing agent and preparation method thereof

The invention discloses an environment-friendly compound surface sizing agent and a preparation method thereof. The preparation method comprises the following steps: (1) gelatinization of cassava starch; (2) dissolution of polyvinyl alcohol; and (3) compounding of the surface sizing agent. The environment-friendly surface sizing agent comprises the following components in parts by weight: 40-60 parts of cassava starch, 40-60 parts of polyvinyl acetate, 5-15 parts of polyvinyl alcohol, 1 part of wet strength agent, 2 parts of dispersing agent, 2 parts of defoaming agent, 2 parts of OP-10 emulsifying agent, and 0.1-1 part of nanometer microcrystalline cellulose. The surface sizing agent is environmentally friendly, and good in dispersion stability and rheological property, and can effectively improve the surface properties, the barrier property and the mechanical properties of paper when applied to the surface of the paper. 本发明公开了一种环境友好型复配表面施胶剂及其制备方法，包括以下步骤：（1）木薯淀粉的糊化；（2）聚乙烯醇的溶解；（3）表面施胶剂的复配。所述的环境友好型表面施胶剂各组分按重量份