Study on synthesis and properties of A-172/acrylate grafted waterborne epoxy resins

Epoxy resin was modified with acrylic acid(AA),methyl methacrylate(MMA),butyl acrylate(BA) and an organosiloxane monomer,vinyl tris(2-methoxyethoxysilane)(A-172),by graft copolymerization.In these reactions,a hydrophilic group was introduced into the epoxy resin in order to make the modified epoxy resin soluble in water.Grafting of A-172 also improved the flexibility and weather resistance properties of the epoxy resin.The resulting waterborne epoxy resins modified with acrylates and A-172 had excellent stability and all-round properties.FT-IR spectroscopy was used to identify the structure of the grafted epoxy resin,and transmission electron microscopy(TEM),atomic force microscopy(AFM) and differential scanning calorimetry(DSC) were also employed to carefully characterize the emulsions and films with different amounts of A-172.Based on the results of the above tests and mechanical properties testing,the effect of varying amounts of A-172 on the properties and structure of the emulsion and the cured film was analyzed.When the amount of A-172 was 6% of the epoxy resin by mass fraction,the modified epoxy latex had excellent dispersion performance and storage stability,and the properties of the corresponding cured film,such as water resistance,flexibility and impact hardness,were greatly improved.