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B. Czupryński

Studies on the effect of di(hydroxymethyl)urea-derived oligodiols on the properties of rigid polyurethanepolyisocyanurate foams

Polimery 1994, No 11-12, 677


DOI: dx.doi.org/10.14314/polimery.1994.677

Summary

The effect was studied of seven oligodiols, each prepared from di(hydroxymethyl)urea, various diols, and epichlorohydrin, on the oxygen index, mechanical properties, softening temperature, and thermal resistance of rigid polyurethane-polyisocyanurate (PUR-PIR) foams prepared with diphenylmethane 4,4'-diisocyanate. The properties of each foam containing an oligodiol were superior to those of a control foam (no oligodiol). The most effective was oligodiol VI, an adduct of epichlorohydrin to N,N'-di(methyleneoxy- 2-hydroxyethyl) urea,whose 0.2 equivalent in a foam resulted in the highest oxygen index (29.2%) and lowest friability (4.89%) as compared to those of the foams containing the other oligodiols. Thermal resistance of the foam was also at its best: the temperature of the major mass loss (found by derivatography) was 320°C in airand 345°C in nitrogen; and compression strength was higher by 50.5 kPa than that of the control foam (310.0 vs. 259.5 kPa).


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