METHOD OF MOULDING RIGID FOAMED POLYURETHANES WITH IMPROVED THERMAL CONDUCTIVITY Russian patent published in 2011 - IPC C08G18/10 C08J9/12 C08G18/16 C08G18/48 C08G101/00 

FIELD: chemistry.

SUBSTANCE: present invention relates to moulding rigid foamed polyurethane for use in household electric appliances, having ratio of the density of the moulded foamed polyurethane (kg/m³) to λ_(10°c) (mW/m·K), measured 2 hours after obtaining the foamed polyurethane, between 1.65 and 2.15, as well as moulded density of 33-38 kg/m³. Given foamed polyurethane is obtained by injecting the reaction mixture into a closed mould with compacting factor of 1.03-1.9, where density of the mould at low pressure is between 300 and 950 mbar, and the reaction mixture contains: (A) organic polyisocyanate, (B) physical foaming agent, (C) polyol composition containing at least one polyol with functionality equal to or greater than 3 and hydroxyl number between 300 and 800, (D) water making up of 0-2.5 wt % of the overall polyol formulation, (E) catalyst and (F) auxiliary substances and/or additives.

EFFECT: optimisation of formulations of foamed polyurethanes to obtain rigid foamed polyurethane, having low heat conductivity at density 33-38 kg/m³ in stable conditions, as well as regulation of the time of filling the mould through process conditions, in order to optimise density distribution and aesthetic homogenisation of foamed polyurethane (fewer cavities) and shorter time for removing the obtained foamed polyurethane from the mould while minimising λ.

20 cl, 5 ex, 5 tbl