Preparation and surface properties of silicon-containing waterborne polyurethane functionalized with fluorine-containing acrylate and micro-nano silica

Abstract

In order to prepare hydrophobic waterborne polyurethane coatings with better performances, the silicon-containing waterborne polyurethane (SiWPU) with functional chain extender hydroxyethyl acrylate (HEA) was prepared first, and then a series of silicon&fluorine-containing polyurethane/acrylate (FSiPUA) emulsions were obtained with flourine containing acrylic monomer by seed emulsion polymerization, introducing micro-nano SiO₂ into FSiPUA emulsion to make the final hybrid emulsion. The properties of SiWPU, FSiPUA and SiO₂/FSiPUA were investigated by fourier transform infrared spectra (FTIR), transmission electron microscope (TEM), Scanning Electron Microscope (SEM) and some other analytical methods. The results revealed that FSiPUA emulsion particles possessed composite core-shell structure and FSiPUA films with suitable ratio performed better than SiWPU films in hardness, water resistance and solvent resistance. The SiO₂/FSiPUA films with micro-nano dual roughness structure showed a water contact angle of 136° with good resistance to acid and alkali.

Keywords

waterborne polyurethane / acrylic / SiO₂ / surface properties

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