Polyurethane rubber is a series of elastomer materials with many carbamate groups on the polymer backbone, which is actually polyurethane rubber, referred to as polyurethane rubber or polyurethane rubber or polyurethane elastomer. The polymer chain contains not only carbamate groups, but also ester groups, ether groups, urea groups, aryl groups and fatty chains. It is usually formed by the reaction of oligomer polyol, polyisocyanate and chain extender. Polyurethane rubber forms different structures and varieties with different raw materials and ratios, reaction methods and conditions.