METHOD FOR SYNTHESIS OF ALKYD RESINS Russian patent published in 2022 - IPC C08G63/49 C08G63/80 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to production of alkyd resins, which are the basis for production of semi-finished alkyd varnishes, in particular, grades PF-060, PF-053. Method for synthesis of alkyd resins consists of two steps, where the first step involves re-esterification of vegetable oil with pentaerythritol, and at the second step, the obtained product is condensed with phthalic and maleic anhydrides at temperature of 240–250 °C. At the first stage, pentaerythritol is melted before loading into the reactor, heated to temperature of 200–210 °C and in the form of melt is loaded into the reactor in a layer of vegetable oil, heated to temperature of 220–230 °C, followed by heating the reactor to temperature of 240–250 °C and holding the reaction mass at this temperature until the re-esterification process is completed. At the second stage, without stopping the heating of the reactor, phthalic and maleic anhydrides in a molten state at temperature of 200–210 °C are introduced into the depth of the reaction mass in portions, after loading the anhydrides, the reaction mass is heated to temperature of 240–250 °C and the reaction mass is held at temperature of 240–250 °C until the polycondensation stage is completed.

EFFECT: improved process of producing alkyd resins, reduced time of synthesis process, reduced consumption of energy resources, reduced cost of end products.

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