What is Alkyd Resins?

The name alkyd, formed from alcid, “alc” for alcohol and “cid” for acid. As the name suggests, this compound is formed from alcohols and acids. This type of resin is obtained by polycondensation of polyhydric alcohols and polybasic acids.

Fisher and Hayward (1998) explained that there are two methods of making alkyd resins. The first method is the Monoglyceride Process. This reaction between glycerol and vegetable oil to form monoglycerides followed by the addition of phthalic anhydride to form alkyd resins. The second process is Fatty Acids, i.e. vegetable oil, glycerol, and phthalic anhydride are included together meaning that there is no need to produce monoglycerides.

As previously mentioned, Alkyd resins are polymers with a condensation polymerization mechanism. Alkyd resin is a product of the esterification reaction between dibasic acid and polyoils modified by dry oil or saturated fatty acids. Oil is used as a modifier of the resin so that the result has good air-drying characteristics, and high durability. So it is suitable for use for paints, etc Condensation occurs when glycerin and phthalic anhydride are heated (200 °C) and become insoluble and intransmissible after the fluidity of the liquid. When used as dry paint, linseed oil, tung oil, etc. Add fatty acids, condense into liquids, add solvents, pigments, etc. to make paint. If cobalt naphthenate is added as a drying accelerator, a room temperature curing paint can be obtained, and if not added, a cake paint that dries at about 150 °C can be obtained.

Source :

• Heriyanto, Heri. Rochmadi2. Arief Budiman. 2010. “Distribusi Berat Molekul Alkyd Resin Termodifikasi Minyak Jagung”, http://eprints.undip.ac.id/21904/1/A-06.pdf.
• Encyclopedia Mypedia