Polyurethanes for Sealants

Polyurethane sealants are one of the three high-grade elastic sealants with excellent physical and chemical properties. Traditional polyurethane sealants are based on polyisocyanate crosslinking systems. At the same time, the modification of polyurethane sealants equips them with more functions and superior performance, and enables them to play a better role in practical application scenarios. The widely used silane-modified polyurethane sealants are a successful example of the modification method of polyurethane sealants. In the preparation of polyurethane sealants, the chapter introduces the main ingredients as well as strategies to produce polyurethane sealant prepolymers. Besides, the chapter introduces a batch of modification methods of polyurethane sealants. As for the application scenarios, polyurethane sealants are mainly used in the civil construction industry, transportation, and machinery manufacturing industries. The application of polyurethane sealants in the medical field also shows great potential. In recent years, the development and design of novel polyurethane sealants with special properties have brought new vitality to the field of polyurethane sealants.