Metüleendifenüül

Metüleendifenüül, also known as methylene diphenyl diisocyanate (MDI), is an aromatic diisocyanate. It is a crucial component in the production of polyurethane materials. MDI exists in several forms, including pure MDI and polymeric MDI (PMDI). Pure MDI is typically a solid at room temperature, while PMDI is a liquid mixture.

The primary use of MDI is in the manufacturing of rigid and flexible polyurethane foams. These foams find widespread applications in insulation for buildings and appliances, automotive seating, furniture cushioning, and packaging. MDI is also a key ingredient in the production of polyurethane elastomers, coatings, adhesives, and sealants, contributing to their durability, flexibility, and resistance to chemicals and abrasion.

MDI is produced through the phosgenation of aniline. The manufacturing process requires stringent safety measures due to the hazardous nature of phosgene. MDI itself is a skin and respiratory irritant, and exposure limits are established to protect workers. Proper handling, ventilation, and personal protective equipment are essential when working with MDI. Its widespread use in diverse industries highlights its importance in modern material science and manufacturing.