FIELD: polymer production. SUBSTANCE: invention provides a method for manufacture of inflexible polyurethane foams, which can be used for filling spaces of refrigeration and deep-freezing apparatuses as heat insulators as well as in construction and for pipeline insulation. The method consists in reaction of (i) polyol component containing 40-80% of saccharose-based polyethylene oxide/propylene oxide polyether or sorbitol with molecular weight 300-800; 3-40% of aliphatic mono-, di-, or polyamine-based polyethylene oxide/propylene oxide polyether with molecular weight 300-800; 3-40% of aliphatic mono-, di-, or polyamine-based polyethylene oxide/propylene oxide polyether with molecular weight 200-800; 3-40% of linear polyethylene oxide/propylene oxide polyether with molecular weight 500-1500; if necessary, other compounds with molecular weight 150-1250 having at least two hydrogen atoms capable of reacting with isocyanate; water, catalysts, and foaming agents selected from alkanes, cycloalkanes, hydro-fluoro-chlorohydrocarbons, and hydro-fluorohydrocarbons; with (ii) organic or modified organic polyisocyanate with 20-48% NCO group content. EFFECT: enabled manufacture of polyurethane foams with closed-pore structure and low heat conduction using different-type pore agents. 12 cl, 2 tbl, 21 ex
