Synthesis of Water-Based Alkyd Resins

The paper reports on the synthesis of water-based alkyd resins and preparation of corresponding water-based paints. Several routes were adapted in the synthesis of alkyd resins. In the first route, non-modified alkyd resins were synthesized at first and then a mixture of the vinyl monomers was grafted on the fatty acid moiety of the alkyd resin via peroxide initiated polyaddition polymerization. In the second route, the vinyl monomers were grafted on fatty acid via peroxide initiated polyaddition polymerization and in the next step the grafted fatty acid was incorporated in the alkyd resin structure through polycondensation polymerization. In the third route, two different methods were adapted. In the first method, the grafted alkyd resins obtained from the first and second routes were reacted with a polyethylene glycol resin (PEG). In the second method, a non-grafted alkyd resin was reacted with PEG and then a mixture of monomers was grafted on fatty acid moiety of the prepared alkyd. Drying time of the films of the prepared resins and paints is similar to that of the solvent-based alkyd resins. The aqueous dispersions of these resins suspend high enough finely-divided titanium dioxide pigment. The gloss of the dried paint film is also high enough. Use of maleic anhydride as dispersing agent is the novelty of this work which is reported for the first time. J. Color Sci. Tech. 1(2007), 25-40.© Institute for Colorants, Paint and Coatings.