Preparation and properties of vinyltriethoxysilane-modified waterborne acrylate resins

Abstract

Silicone-modified waterborne polyacrylate resins were created using semi-continuous emulsion polymerization. Vinyltriethoxysilane (A151) was used as a modified monomer. Two-component waterborne coatings were then prepared by adding poly (hexamethylene diisocyanate) (PHDI) as a curing agent to the A151-modified polyacrylate resins for the first time. The reaction mechanism of the acrylate copolymer and the curing mechanism of the coating were demonstrated using Fourier transform infrared spectroscopy (FTIR). The modification significantly improved the hydrophobicity and thermal stability of the coating, as confirmed by increased contact angle measurement and thermogravimetric (TG) analysis. Water absorption was reduced from 35 % to 10 % while maintaining optimal adhesion levels. Additionally, the low glass transition temperature of the acrylate resin emulsion film was investigated by differential scanning calorimetry (DSC), indicating excellent coating film properties for the two-component waterborne resin. The modification with PHDI not only significantly increased the water resistance time of the polymer coating but also improved the coating hardness while maintaining excellent adhesion of the silicon-containing resin to the substrate. This study introduces a new method for synthesizing low-cost, high-performance waterborne acrylate resins.