Abstract:The Acrylate polymer/alkyd resin hybrid emulsion (WPAARSi) was prepared by solution phase inversion polymerization using the dimethylaminoethyl methacrylate (DM), methyl methacrylate (MMA), butyl acrylate (BA), γ-methacryloxypropyltrimethoxysilane (KH-570) as modified monomers, azobisisobutyronitrile (AIBN) as initiator, ropylene glycol methyl ether (PM) as cosolvent and acetic acid (Ac) as neutralizer. The effects of monomer dropping time, polymerization temperature, monomer ratio of acrylate monomers and amount of alkyd resin (BTS-SZ) on the gloss and water resistance of WPAARSi coating were investigated. The structure and properties of the polymer were characterized by FT-IR, TEM, GPC, TGA, rheological analyzer and mirror to gloss meter. The results showed that when the dropping time was 2 h, the polymerization temperature was 85 ℃, m（DM）=6%，m（MMA）∶m（BA）=18∶2，m（BTS-SZ）=55%，m（KH-570）=0.62%，m（AIBN）=1.62%, the gloss of the coating was 116% and the water absorption was 2.8%. TEM test showed that the latex particles presented the core-shell structure. GPC test showed that the mass average molecular weight of the modified alkyd resin increased from 1413 to 2945, the weight average molecular weight increased from 5152 to 19853, and the relative molecular mass distribution became wide. TGA tests showed that the thermal stability of the modified alkyd resin was improved. Analysis of emulsion rheological behavior indicated that the emulsion presented good thixotropy.