Preparation of Organosilicon Modified Cationic Acrylic Resin and Its Application in Cathodic Electrodeposition Coatings

The organosilicon modified cationic acrylic resin is prepared via solution polymerization technology, which butyl acrylate (BA), methyl methacrylate (MMA), styrene (St), vinyltriethoxysilane(VTES), dimethylaminoethyl methacrylate (DMAEMA) and hydroxy propyl methacrylate (HPMA) as the co-polymerized monomers, and proprylene glycol monomethyl ether (PGME) as solvent, and 2,2-azo-bis-iso-butyronitrile (AIBN) as the initiator to create a resin to introduce the Si-O bond into the polymer chains. The cathodic electrodeposition (CED) coatings were prepared by mixing the synthetic resin and blocked isocyanate. The influence of the amount of VETS on the resin and the resultant CED coatings is investigated in detail. The optimum amount of VETS is obtained, which is 5.0%. The hydrophobicity and the acid and alkaline resistance of the film are improved when VETS is introduced to co-polymerize with other monomers.