Abstract
Glycolysis products from microcellular elastomer polyurethane were used in the preparation of PUR-PIR rigid foams.
Foams were generally good but, with a low NCO index, showed insufficient dimensional stability.
The foam stability can be improved by an increase in the crosslinking density of the polymer, by using polyol components with an increased functionality or by increasing the isocyanurate content.
The improved crosslinking induced by trimerisation is more efficient for stability than that derived by higher polyol functionality.
The use of MDI with a high average functionality and glycolysis products with a relatively high equivalent weight, permit a more favourable MDI/polyol ratio and are therefore economical.
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