Reaction of polyurethane isocyanate and hydroxyl group

The reaction product of isocyanate group and hydroxyl group is urethane. Studies have shown that the reaction between isocyanate and hydroxyl is a second-order reaction, and the reaction rate constant changes with the hydroxyl content and does not change with the isocyanate concentration. Polyol and polyisocyanate form polyurethane (referred to as polyurethane). If the isocyanate…