FIELD: chemistry.
SUBSTANCE: invention relates to method of producing short-chain polyester-polyols used in production of hard polyurethane foams. The method includes: (i) contact of amine with first alkylene oxides, which is ethylene oxide block with used ethylene oxide in quantity of about 20-40% relative to total of alkylene oxide, where initial quantity of the first alkylene oxide, contacting with amine is 5-30% from total quantity of alkylene oxide subject to adding to amin, (ii) adding catalyst from alkali metal hydroxide in quantity from about 0.001 to 0.1 wt % relative to mass of the final polyesters-polyols, (iii) contact of amine with the rest quantity of the first alkylene oxide and thereafter with the second alkylene oxide, which is a propylene oxide block, with the quantity of the used alkylene oxide, and (iv) adding hydroxyl carboxylic acid into epoxidized mixture. Simple polyester-polyol prepared by using said method and method of hard foam production including reaction of organic polyisocyanates with said polyester-polyol is also described. Reduction of catalyst quantity used during synthesis of polyester-polyol. Adding such catalyst earlier in reaction of epoxidation after neutralisation of carboxylic acid results in reduction of emitting large quantity of solid wastes, thus providing with transparent simple polyester-polyol originated by amines and which is not required to be filtrating before application.
EFFECT: polyurethane foams prepared by using such polyester-polyols has high flowability, improved time of jellification and foam rise height.
27 cl, 3 tbl, 2 ex
