Polyurethane CatalystElastic There are many types of polyurethane elastomers. According to the raw materials of oligomer polyols, polyurethane elastomers can be divided into polyester type, polyether type, polyolefin type, polycarbonate type, etc. Polyether type can be divided into polyurethane elastomers according to specific varieties. Tetrahydrofuran type, polyoxypropylene type, etc.;
According to the two Different isocyanates can be divided into aliphatic and aromatic elastomers, which are further subdivided into TDI type, MDI type, IPDI type, NDI type and other types. Conventional polyurethane elastomers are mainly polyester type, polyether type, TDI type, and MDI type. Chain extenders mainly include diols and diamines. The polyurethane catalyst obtained by chain extension of diamine is strictly speaking a polyurethane-urea elastomer.
From the manufacturing process, polyurethane catalyst elastomers are traditionally It is divided into three categories: casting type, thermoplastic type and mixing type, all of which can be synthesized by prepolymerization method and one-step method. However, the output of products prepared by some innovative processes has exceeded that of some traditional types. For example, the production of solid and microporous polyurethane elastomers by the reaction injection molding (RIM) process has become an important category. In addition, there are solution coating and solution casting molding. They are also an important type of elastic polyurethane and are mainly used in the production of synthetic leather. Spray molding is also a new technology that has developed rapidly at home and abroad in the past decade.
