The Influential Factors of Property on Polyether-polyol Type Polyurethane Elastomer

摘要

Polyurethane (PU) elastomers based on all kinds of polyether-polygol, diisocyanate and chain extender were prepared by two-step processes; the different influential factors of polyurethane elastomer were discussed in detail. The results showed that when the molecular weight of polyether-polygol increased, the hardness, tensile strength and tear resistance of polyurethane elastomer decreased, but the elongation at break increased; the property of polyurethane elastomer increased with the increasing percentage of hard segment phase; R numerical value (-NCO/-OH) was controlled between 1.01 and 1.03; the shorter chain-extender had excellent microphase separation and mechanical properties; With the amount of 1, 4-butadiene alcohol(BDO) increasing, the performance of polyurethane elastomer becomes well, but when the amount of 1, 4-butadiene alcohol comes to a point it appears reverse.