Abstract
The kinetics of the preparation of unstyrenated and styrenated palm kernel oil based alkyd resins were studied using polycondensation and copolymerization process. Three alkyd resins A, B, and C of medium oil length were prepared using phthalic anhydride, maleic anhydride, and glycerol at stipulated ratios. The prepared alkyd resins were copolymerized with styrene using benzyol peroxide as an initiator at 150°C for 3 hr. The kinetic behavior of the polyesterification and copolymerization process and the resulting alkyd resins and styrenated alkyd resins were studied as a function of viscosity and the reaction time using integral method of analysis. The results showed that the resins A and B followed the first order reaction while resin C followed the second order reaction with rate constants of 13 × 10-3 min-1, 30 × 10-3 min-1, and 3 × 10-3 (Pa.S)(min)-1 respectively. For styrenated alkyds, kinetic study confirmed that styrenated alkyd A followed the first order kinetics and styrenated alkyds B and C followed the second order kinetics with rate constants of 8 × 10-3 min-1, 6 × 10-4 (Pa.S)(min)-1, and 6 × 10-4 (Pa.S)(min)-1 respectively.
Highlights
Alkyd resins are any of a large group of thermoplastic resins that are essentially polyesters made by heating polyhydric alcohol with polybasic acids or their anhydride and used in making protective coatings and gold weathering properties [1]
The viscosity of alkyd resins determined during the polyesterification stage of the alkyd resin synthesis was used in analysis of kinetic study
A close look at the values of R2 showed that synthesis of palm kernel oil-modified resin could follow first or second order kinetics depending on the time of reaction
Summary
Alkyd resins are any of a large group of thermoplastic resins that are essentially polyesters made by heating polyhydric alcohol with polybasic acids or their anhydride and used in making protective coatings and gold weathering properties [1]. These resins are useful as film forming agents in paint, varnished and enamel and as thermosetting plastics that can be moulded into solid objects. The lower the phthalic content of an alkyd, the higher the amount of oil used These drying oils, which are regarded as standards in surface coating industry are still very scarce and expensive. Their alkyds are prone to yellowing due to high unsaturation
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