Aqueous Silicone-Acrylic Dispersions of Hybrid Particle Structure-Effect of Silicone Part Composition on the Properties of Dispersions and the Corresponding Nanopowders

摘要

Aqueous silicone-acrylic dispersions of hybrid core-shell particle structure can be obtained in the process of emulsion polymerization of acrylic or methacrylic monomers in previously synthesized silicone resin dispersions. If the T_g of the acrylic (methacrylic) shell is around 120°C or higher, drying of such dispersions leads to "nanopowders" which can be applied as impact modifiers for plastics and powder coatings due to the presence of low T_g silicone resin contained in the hybrid nanoparticles. The aim of our study was to investigate the effect of silicone resin composition on the properties of dispersions and the corresponding nanopowders what, in turn, was expected to influence the properties of powder coatings modified with such nanopowders.