Polyurethane Definition



Polyurethane is the (plastic) polymer product of reaction between Isocyanates from NCO group and polyols from OH groups. The reaction is totally a polymerization reaction and polyurethanes are a subfamily of plastics.

Isocyanates: are named according to their NCO percent and function or the NCO number in a molecule. NCO numbers are distinctive properties of Isocyanates.

The most common two aromatic isocyanates:
MDI: diphenylmetandiisocyanate - NCO % 31,5
TDI: toluendiisocyanate - NCO % 48,2



Polyol’s are defined by their free OH (hydroxyl) number or molecular weight (mgKOH/g). The hydroxyl number in polyol’s is inverse proportional to molecular weight. Polyol’s are divided into two groups being; polyether and polyester. The polyols used nowadays are 80-90% polyether polyols.

 




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