Studies on the effect of di(hydroxymethyl)urea-derived oligodiols on the properties of rigid polyurethanepolyisocyanurate foams
Polimery 1994, No 11-12, 677
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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