Synthesis of rubber seed oil waterborne alkyd resin from glucitol

Abstract

Solubility properties of alkyd resins from phthalic and maleic anhydrides, glucitol and rubber seed oil (RSO) as raw materials were examined. Four types of glucitol-based medium oil length alkyd resins (ALKYD A–D, two for each acid anhydride) samples were formulated with phthalic anhydride, maleic anhydride, glucitol aqueous solution, and RSO. The physical, chemical, and film characteristics of the glucitol-modified alkyd resins were examined, and the result was compared with the standard alkyd resins and soybean-based alkyd resin. It was observed that all samples were soluble in xylene and butoxyethanol but not water. All of the samples have varying solubilities in water/xylene ratio (%) and complete solubility in water/butoxyethanol (%) ratio of 40:60, 50:50, and 60:40, respectively. ALKYD A is soluble in all solvents except water where it was sparingly soluble at room temperature. The spectral analysis revealed the polyesterification reaction and hydrogen-bonding integrity of the alkyd resins and the polybasic acid. The physical and chemical properties and the performance indices of the glucitol-based alkyd resin results show that they possess acceptable drying properties, chemical resistance, and mechanical properties. Performance of ALKYD A and C gave nearly the same result as the standard alkyd resins and soybean-based alkyd resin. It has potential as a choice waterborne binder for alkyd resin paint and can help in reducing VOC.