What is Alkyd Resin ?
Alkid is a kind of polyesther synthetic resin created by the polycondensation reaction of polyhidric alcohols and dibasic acids and modified with oil or fatty acids. Considered as the first polyesther study, Berzelius’s (1847) synthetic resin study started with the reaction of tartaric acid and glycerin, then speeded up with alkyd resin studies after the World War II and began to be used widely in paint and varnish manufacturing. The word alkyd derived from alcohol and anhydride and the polyesther part in alkyd resin helps the resin’s hardness while the oil and fatty acid part helps the flexibility, adhesion, pigment wetting and its’ solubility with solvents. Alkyd resin is the most important building block of paint and varnish systems which directly effects the film forming as well as determining the important properties of coating films like physical and chemical resistance, adhesion and durability.
Today conventional alkyds are widely used and because their chemical structures are suitable they can be used by cold blending with most of the resins or radical groups or by modified as “hot blends”. It’s possible for the specialities of alkyd polymer to be improved. While differently modified alkyd resins can be produced with new designs, today the trend toward the high solid systems and especially emulsified alkyds is rapidly increasing.