PROCESS FOR THE PREPARATION OF A LIQUID POLYURETHANE-UREA PREPOLYMER AND ITS FURTHER WORKING-UP TO AN OPEN-PORE REACTIVE RESIN CONCRETE

摘要

A liquid polyurethane-urea prepolymer is prepared by reacting a polyol mixture consisting of 70 to 95 parts by weight of a linear epsilon -polycaprolactone with a molecular weight between 500 and 1000 and of 5 to 30 parts by weight of a linear polyethylene glycol with a molecular weight between 300 and 3000, with 1.8 to 1.95 equivalents of toluylene diisocyanate, and diluting the product with 0.3 to 0.7 equivalents, based on the polyol mixture, of a second, liquid polyisocyanate. The product can be mixed with a mineral mixture and left to set under the action of moisture to give an open-pore cold-cured resin concrete.