MDI-100 (pure MDI) is an MDI (the so-called pure MDI) containing more than 99% of 4,4'-diphenylmethane diisocyanate. It is a white or yellowish solid state at room temperature and melts into a colorless to yellowish liquid.The melting point is 38℃, the specific gravity is 1.19, and the content of the "-NCO" group is 33.6%.It is bifunctional (there are two-NCO groups on one molecule); it is most used in the polyurethane industry as a fiber (spandex), and can also be used as a prepomer (elastomer, etc.) for synthesis; the main production process adopts nitrobenzene catalytic hydrogenation method: for convenience of use, use some special processes (carbonized diimide modification, similar to quenching) to treat it and make it liquid at room temperature.
Polymeric MDI is a mixture containing both 4,4'-diphenylmethane diisocyanate and polyphenylmethane polyisocyanate, with a functionality of at least 2.6 like the one used in rigid foams.The distinction lies only in the addition of additives with improved properties.,
Pure MDI (chemical name is diphenylmethane diisocyanate) and polymeric MDI (chemical name is polymethylene polyphenylisocyanate) English name: Pure MDI, Polymeric-MDI Polymerization MDI: It is a dark brown or brown liquid at room temperature, with a specific gravity of 1.19 and adjustable viscosity. The general polymerization MDI viscosity is generally 150-250Mpa.Between s/25℃, the content of the "-NCO" group is 30-32%.