PROCESS FOR PREPARING NON-YELLOWING FLEXIBLE POLYURETHANE FOAM WITH HIGH RESILIENCE AND DURABILITY

摘要

Provided is a process for preparing a flexible polyurethane foam via catalytic reaction of isocyanates with polyols. The process comprises reacting a resin premix, which simultaneously utilizes a polyol including combined use of (A) a polyether polyol having an ethylene oxide content of 0 to 30% by weight, a propylene oxide content of 70 to 100% by weight and a molecular weight of 400 to 7,000 and (B) a polyether polyol containing 20 to 60% by weight of solids of a polyvinyl compound, or (C) a polyester polyol which is synthesized by polycon-densation of an alcohol with an acid and has a functionality of 2 to 3 and a viscosity of 5,000 to 30,000 cps, or a mixture of polyols A, B and C, a mixed catalyst of tin octoate and dibutyltin dilaurate, and amine catalysts, with aliphatic isocyanates having modified reactivity, thereby preparing a flexible urethane foam having superior yellowing resistance.