Drying Oils

Abstract

Natural and synthetic drying oils are discussed. Occurrence, isolation, composition, and analysis of oils is covered. Mechanism of drying through free‐radical initiated autoxidation is described with particular emphasis, in the case of oils with nonconjugated double bonds, of the role of activated methylene groups between double bonds. The reactions are catalyzed by oil‐soluble transition‐metal salts. Modified and synthetic oils include: varnishes, synthetically conjugated oils, esters of higher functionality polyols, maleic anhydride‐modified oils, and vinyl‐modified oils. Data on economic aspects and lists of specifications are included. Natural drying and semidrying oils as well as their fatty acids are used in making alkyds, epoxy esters, and urethane oils, which can properly be considered synthetic drying oils. Uses of drying oils discussed include paints, printing inks, and other uses.

Hydrophobic glass and paper coatings based on plasma polymerized vegetable oils using a novel atmospheric pressure plasma concept

“…Typical drying oils are linseed oil, tung oil, and safflower oil. [14,15] The number and position of double bonds have a decisive effect on drying. The triple unsaturated fatty acids linolenic acid (isolated double bonds) and α-elaeostearic acid (conjugated double bonds) are considered to dry particularly well.…”

“…With its high content of conjugated double bonds, tung oil is therefore considered to be one of the best drying oils available. [14,15] Although the successful application of drying oils appears highly interesting with respect to application for plasma polymer-based hydrophobic coatings, literature shows only few examples of plasma used to apply vegetable oil-or fatty acid-based hydrophobic coatings, all of them referring to plasma treatment. Coatings are usually applied by substrate immersion into the fatty acid or vegetable oil solution and combined with plasma treatment, frequently followed by Soxhlet extraction to remove unbound material.…”

Preparation of glycol esters of soybean oil fatty acids and their potential as coalescent aids in paint formulations

“…Vegetable oils, such as linseed oil and soybean oil, are used as drying oil in oil-modified alkyd resins (10) or as base fluids for environmentally safe lubricants (11). In Europe, vegetable oils have been used as diesel fuel, either neat or blended with diesel oil (12,13).…”