Abstract:The methyl eleostearate (ME) prepared by transesterification of tung oil with methanol was used to synthesize epoxidized methyl eleostearat (EME) by the reaction with hydrogen peroxide and acetic acid under the catalysis of concentrated phosphoric acid. Then, epoxidized methyl eleostearat was reacted with diethanolamine (DEA) to prepare tung oil-based polyols under UV irradiation using triarylsulfonium salts as catalyst. Lastly, a UV-curable tung oil-based hyperbranched urethane acrylate dispersion was prepared by a two-step procedure using tung oil-based polyol, isophorone diisocyanate (IPDI) and hydroxyethyl methacrylate (HEMA) as raw material and dibutyltin dilaurate (DBTAL) as catalyst. And the chemical structures of the products were identified by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), physical and mechanical properties, and contact angles. The results indicate that the hydroxyl value of tung oil based polyols is 599.54 mg KOH/g and the average relative molecular weight is 544. And the tung oil based hyperbranched polyurethane acrylate (TO-based PUA) possesses good thermal stability and mechanical properties, including glass transition temperature of 37.2 ℃, tensile strength of 8.58 MPa, breaking elongation of 23.31%, and surface tension of 41.36 mJ/m2.