Studies on synthesis and characterization of aqueous hybrid silicone-acrylic and acrylic-silicone dispersions and coatings. Part II

Abstract

Aqueous silicone-acrylic (SIL/ACR) and acrylic-silicone (ACR/SIL) dispersions with hybrid particle structure were synthesized, respectively, by polymerization of acrylic/styrene monomers in silicone resin dispersion (SIL) and of silicone monomers in two acrylic/styrene copolymer dispersions (ACR A and ACR B). A comprehensive study of the effect of SIL/ACR or ACR/SIL (w/w) ratio, i.e. of the silicone component content in the dispersion solids, on the properties of such hybrid dispersions, coatings and films was conducted. It was found that increasing the SIL/ACR ratio from 0 to 1/9, 1/6 and 1/3 (or decreasing ACR/SIL ratio accordingly) influenced quite significantly the appearance of hybrid dispersion particles and thus also the properties of dispersions (particle size, MFFT, Tg of dispersion solids) as well as the properties of coatings (contact angle, surface free energy, water resistance, water vapor permeability, hardness, impact resistance) and films (% swell in toluene, % of toluene-soluble fraction, tensile strength, elongation at break) made from these dispersions were affected. Based on the results of these investigations some dispersions may be selected for further testing as binders in architectural paints.