Effects of glycerol and NCO/OH on rigid polyurethane foam based on bio-polyol of rubber seed oil using water as blowing agent

Abstract

The work used bio-polyol from rubber seed oil for rigid polyurethane synthesis. The water was used as the only blowing agent. FTIR spectrum demonstrated the formation of polyurethanes from bio-polyol, glycerol, isocyanate and water. The effects of water, glycerol content and NCO/OH molar ratio on properties of foam were investigated through compression strength, density, average porous radius, size and distribution of cells. The suitable recipe for materials was chosen and the cream time, the rise time and the tack free time were also determined. The rigid polyurethane foam was synthesized at water and glycerol content of 4 and 3 wt.% of polyol, molar NCO/OH ratio of 0.8 had the compressive strength of 125.11 KPa, density of 62.75 kg/m3 and average porous radius of 237.52 μm.