Przemysl Chemiczny, Vol.90, No.7, 1376-1381, 2011
Synthesis of polyurethanes under involving renewable raw materials
Palm and rapeseed oils were epoxidized with H(2)O(2) in AcOH/PhMe in presence of H(2)SO(4) and converted with (HOCH(2)CH(2))(2)O or HO(CH(2))(6)OH in presence of H(2)SO(4) to resp. polyols at 102-106 degrees C under microwave irradn. The polyols (hydroxyl no. 77-294 mg KOH/g) were reacted with MeC(6)H(3)(NCO)(2) or polymeric (ONCC(6)H(4))(2)CH(2) in presence of amine catalysts, surfactants and H(2)O, optionally Ca stearate and flax fibers (optionally after addn. of corn. polyols) to polyurethane foams. The foam samples were studied for compression, tensile and bending strengths, heat cond., d., thermal stability and porous structure. The replacing up to 30% by mass of the corn. polyols with the prepd. ones did not result in any deterioration of the rigid and flexible polyurethanes produced.