Studies on utilization of wheat slops for production of rigid polyurethane-polyisocyanurate foam

Abstract

Solid parts of the wheat slops were applied as a filler (5-30 wt. % in relation to the sum of polyisocyanate and polyether polyol masses) in polyurethane-polyisocyjanurate (PUR-PIR) composition. Six foams containing different amounts of slops were prepared and then, their physical and mechanical properties i.e. apparent density, compressive strength, brittleness, combustion residue, stability of linear dimensions, change of volume, weight loss (48 h, temp. 120°C), softening point, content of the closed cells and absorbability of water were determined. Moreover, the foams were subjected to thermogravimetric and infrared (IR) analyses. The results proved that waste wheat slops can be useful as a filler for preparation of rigid PUR-PIR foams.