HEAT INSULATION MATERIAL FOR TUBES MADE FROM WATER EXPANDED HEAT INSULATION MATERIALS SUITABLE FOAM FORMULATIONS USING POLYOLS TO IMPROVE SOFTENING TEMPERATURE.

摘要

A foam formulation, useful in the preparation of water-blown heat-insulating material, comprising (i) one or more polyols, (ii) one or more organic polyisocyanates, (iii) water, and (iv) auxiliary materials known in the art, characterized in that the polyol or polyol mixture has an average functionality (Fn) varying from 2.7 to 4.3; a hydroxyl value (OHv) of 325 to 500 mg KOH/g, and a viscosity measured at 20 DEG C of between 350 mPa.s and 2300 mPa.s; the use of said polyol or polyol mixture as softening point improver in a process of preparing water-blown heat-insulating material, and the water-blown heat-insulating material so prepared.