Abstract: A waterborne epoxy/alkyd resin (EP/AR) was synthesized, which was simply used as a coating or reinforced with glass fiber and cured forming composites. Studies using infrared spectrometer (FTIR) and differential scanning calorimeter (DSC) found that tertiary amine had a good catalyzing effect for the curing. The glass transition temperature (Tg) and thermal degradation of the composites were characterized by dynamic mechanical spectrometer (DMA) and thermal analysis (TG). The mechanical and electrical properties of the composites and coating were determined. When the mass ratio of AR with ER was 1 :1, the Tg was 64.6 oC, the tensile and impact strengths were 141.67 MPa and 120.54 kJ/m2, respectively. The dielectric constant and dielectric loss tangent of the composites were between 1.5 1.99 and between 0.001~0.008, respectively. The pencil rigidity of the coating was over 4H and impact strength reached 20 kg·cm.

Key words: waterborne alkyd resin, epoxy resin, thermal analysis, curing behavior, mechanical property