METHOD FOR PREPARING ALKYDE RESIN Russian patent published in 2005 - IPC

FIELD: chemical technology.

SUBSTANCE: invention relates to technology for preparing alkyde resin that can be used as a base in preparing paint and varnish materials. Method for preparing alkyde resin involves interaction of vegetable oil, phthalic anhydride, pentaerythritol in heating followed by azeotropic distilling off of reaction water. Distilled tall oil is used as vegetable oil and maleic anhydride are added additionally in the following regimen and charging components: firstly, distilled tall oil, maleic and phthalic anhydride are charged, the mixture is heated to 170-180°C and kept up to the complete binding maleic anhydride. Then pentaerythritol and xylene are charged for azeotropic distilling off of water and the reaction mixture is heated to 240-250°C until acid number value of resin will be 10-15 mg of KOH/g and viscosity value of 53% resin solution in white spirit 60-80 s. Components for synthesis are taken in the following ratio, wt.-%: distilled tall oil, 70-78; phthalic anhydride, 1-7; maleic anhydride, 3-5, and pentaerythritol, the balance. Coatings made in using the proposed resin show high impact strength and prolonged working life.

EFFECT: improved preparing method.

3 tbl, 5 ex