Characteristics of Styrene-Acrylate Micro Emulsion with High Solid Content and their Effect on the Coating Properties

The cross-linked/non-crosslinked styrene-acrylate micro emulsion with high solid content were synthesized using styrene (St), butyl acrylate (BA), acrylic acid (AA), methyl acrylate (MMA), N-hydroxymethyl acrylamide (NMA) as the raw materials by seeded polymerization, and characterized by Fourier transform infrared spectroscopy (FTIR) and transmission electron microscope (TEM); The coating for the coated paper was prepared by the two kinds of styrene-acrylate micro emulsion, whose effect on the viscosity and water retention of the coating was discussed. The results show that the particles of two kinds of styrene-acrylate micro emulsion are regular sphericity in shape; The apparent viscosity of the coating decreases with the increase of the shear rate, indicating a pseudo-plastic flow characteristic. There is no obvious difference on the viscosity between the two coating under the condition of high shear rate. Compared with the coating prepared by non-crosslinked styrene-acrylate micro emulsion, the coating prepared by cross-linked styrene-acrylate micro emulsion has a bigger viscosity and a better property of water retention.