Abstract: The curing process of alkyd resin is investigated with FT-IRin this paper. The vibration of unsaturated carbon-hydrogen bonds was chosen as the characteristic change at 3007 cm^-1 and the stretching vibration of phenyl group at 1600 cm^-1 was chosen as the internal standard sign in the curing process of alkyd resin. The results show that the number of unsaturated bonds gradually reduces and the number of the functional groups containing oxygen, such as hydroxyl groups and carboxyl groups, gradually increases along with the curing process which indicates that some oxygen has been absorbed into the film. The curing speed of alkyd resin is related to the thickness of alkyd resin film. The curing speed of alkyd resin is controlled by the diffusion process of oxygen.

Key words: Alkyd resin, Curing process, FTIR