FIELD: chemistry.
SUBSTANCE: method involves reacting a composition based on organic polyisocyanates with a composition which reacts with isocyanates in the presence of a hydrocarbon as a foaming agent. The said composition which reacts with isocyanates contains a maximum of 20 wt % polyester-polyols obtained from secondary streams, wastes or residue from production of DMT and/or PET, between 30 wt % and 50 wt % polyether-polyol obtained by reacting propylene oxide with an aromatic amine as an initiator, and between 30 wt % and 50 wt % polyether-polyol which is not initiated by an aromatic amine, where amount is based on total amount of the compound which reacts with isocyanates. Rigid polyurethane foam or polyisocyanurate foam modified with urethane corresponding to this proposed invention has low lambda value especially at 10°C.
EFFECT: improved thermal insulating properties of electrical appliances when such polyurethane foam is used, improved power consumption.
15 cl, 2 ex, 2 tbl
