Description
MDI stands for Methylene Diphenyl Diisocyanate. It is an aromatic diisocyanate primarily used in the production of polyurethane foams, elastomers, coatings, adhesives, and sealants. MDI is a versatile compound that reacts with polyols to form polyurethane polymers.
Some key characteristics and uses of MDI include:
- High Reactivity: MDI reacts quickly with polyols to form polyurethane, making it suitable for use in fast-curing applications.
- Thermal Insulation: MDI is often used in the production of rigid polyurethane foams, which are valued for their thermal insulation properties. These foams are used in building insulation, refrigeration, and other applications where thermal insulation is important.
- Adhesives and Sealants: MDI is used in the production of adhesives and sealants, where it provides strong bonding and sealing properties.
- Elastomers: MDI is used in the production of polyurethane elastomers, which are rubber-like materials that are flexible and durable.
- Coatings: MDI is used in the production of polyurethane coatings, which provide protection and decorative finishes for various surfaces.
MDI is available in different forms, including pure MDI (pMDI) and polymeric MDI (pMDI), which have different reactivity and properties. pMDI is often used in rigid foam applications, while pMDI is used in flexible foam applications.