Preparation and Performance of a Self-Produced High-Molecular-Weight Waterborne Epoxy–Acrylic Emulsion

To improve the stability of waterborne epoxy–acrylic emulsions and their comprehensive properties, such as chemical resistance coatings, a new research idea is proposed in this paper. First, series high-molecular-weight epoxy resins were synthesized with resin E-51 bisphenol A (BPA) using benzyl triphenyl phosphine bromide catalyst. Then, free-radical graft copolymerization was carried out between methacrylic acid (MAA), styrene (ST), butyl acrylate (BA) benzoyl peroxide (BPO) initiator. This method ensured that groups retained. Finally, carboxylic neutralized N,N-dimethylethanolamine (DMEA), stable aqueous emulsion obtained by high-speed dispersion deionized water. The effects key factors temperature, time, molecular weight dosage resin, MAA, BPO, neutralization degree synthesis coating film properties mainly discussed. distribution determined gel permeation chromatography (GPC). its copolymer analyzed characterized Fourier-transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA). particle size tested laser analysis. morphology particles observed transmission electron microscopy. results showed acrylic monomers (MAA, ST, BA) grafted onto resin. copolymers higher glass transition temperatures compared those pure TGA started to decompose at high temperature before did, thermal slightly reduced. prepared 160 nm had storage more than one year excellent dilution stability, mechanical freeze–thaw stability. coated cured 150 °C for 1 h pencil hardness 5 H, an adhesion grade 1, flexibility mm. water >60 days, salt >30 >10 alkali >5 days.