Method for producing polyurethane insulating foams
AssigneeEvonik Degussa GmbH
InventorsCarsten Schiller, Matthias Naumann, Ruediger Landers, Christian Eilbracht
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Abstract
The object of the invention is a method for producing polyurethane and/or polyisocyanurate insulating foam based on foaming reaction mixtures containing polyisocyanates, compounds having reactive hydrogen atoms, propellants, stabilizers, nucleation agents, and optionally further additives, which is characterized in that porous solids, in particular silicates having a zeolite structure, are used as the nucleation agents.
Claims17
A process for producing polyurethane and polyisocyanurate insulation foams based on foamable reaction mixtures containing polyisocyanates, compounds having reactive hydrogen atoms, blowing agents, stabilizers, nucleating agents and, if appropriate, further additives, the process comprising:
- utilizing porous solids having a zeolite structure as nucleating agents in an amount of 0.2 to 1.5 parts by weight zeolite per 100 parts by weight polyol;
- wherein the insulation foams produced have a density of from 25 kg/m3 to 45 kg/m3;
- and
- wherein the insulation foams produced have a number of cells per centimetre is in the range of greater than 40 cells/cm.
Dependencies are inferred from the claim text.