Amide and amidoester fatty acid derivatives as multifunctional components of protective alkyd urethane coatings

In order to expand the range of practically useful products based on renewable raw materials, a number of fatty acid derivatives, products of sunflower oil processing, were synthesized. The reaction of methyl esters of fatty acids with mono-, diethanolamine and piperazine yielded the corresponding amides of fatty acids. By reacting ethanolamide derivatives with maleic anhydride, maleated amidoester derivatives of fatty acids containing free carboxyl or hydroxyl groups were synthesized. A copper-containing product was prepared by the interaction of the dimaleinated derivative with copper acetate. All synthesized products showed solubility in alcohols and aromatic solvents. The obtained products were studied as multifunctional components of a film-forming system based on alkyd-urethane varnish brand AU(AL)-52W. It is shown that the synthesized ethanolamide and amidoester derivatives are regulators of the rheological properties of the varnish. Depending on the concentration, they can reduce (by 25–52%) or increase the dynamic viscosity of the varnish. Along with the effect on rheological properties, the synthesized additives in concentrations of up to 0.5–1.5% contribute to increasing the hardness of varnish coatings by 7.5–12.5% and do not negatively affect the drying time.