Alkyd resin from rubber seed oil/linseed oil blend: A comparative study of the physiochemical properties

This study was aimed at the synthesis and characterization of alkyd from rubber seed/linseed oil blends. Different percentages of rubber seed oil were blended with linseed oil for the preparation of alkyd via condensation polymerisation of monoglyceride with phthalic anhydride. Physiochemical properties like colour, acid value, saponification value, iodine value, drying schedule, chemical resistance were evaluated for the different alkyd samples synthesized. The colour of the different samples was unaffected by blending. The acid values of the alkyds obtained were observed to be in the range of 8.59-10.1 mgKOH/g. The iodine values of the different alkyd samples prepared increased with increase in the percentage of linseed oil in the blends. The blends showed resistance to brine, water and acid. However, only some exhibited fair resistance to alkali. The intrinsic viscosity was also determined by extrapolation from Huggins and Kraemer viscosity relationship. The results showed that the alkyd resins synthesized from the blend of linseed and rubber seed oil showed favourable properties that make linseed oil good blending oil for the synthesis of alkyd resin.