FIELD: organic chemistry, polymers, chemical technology.
SUBSTANCE: invention relates to a method for synthesis of complex polyesters that are used in synthesis of polyurethanes. Invention proposes a method for synthesis of complex polyesters by the polycondensation reaction of phthalic anhydride and diethylene glycol in the molar ratio = 1:(1.2-2.5) at temperature 205 ± 5°C or adipic acid and ethylene glycol in the molar ratio = 1:(1.5-1.6) at 195 ± 5°C, or adipic acid, ethylene glycol and 1,4-butanediol in the molar ratio = 1:(0.42-0.78) at 200 ± 5°C to acid number value 35-42 mg KOH/h followed by addition to the reaction mixture tetrabutoxytitanium as a catalyst and vacuum condensation is carried out to acid number value 1 mg KOH/g, not above. Proposed methods require by 1.4-2-fold less time as compared with the known ones and provide significant reducing energy consumption.
EFFECT: simplified method for synthesis of complex polyesters for polyurethanes.
3 cl, 1 tbl, 7 ex
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|---|---|---|---|
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