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 Polyurethane Systems

Polyurethane two components rigid foam systems
In general, polyol component is physical mixture of polyether and polyesters resins with additives like :
- sylicons
- catalists
- blowing agents
- fire retardants
Isocyanate component is polymeric diphenylemthane 4,4 diisocyanate (pMDI).

The two components system have the advantage of fast reaction time, or cure speed, in comparison to typical one  component systems. The main curing mechanism of two component system is the formation of urethane linkages, resulting  from the reaction of the isocyanate with the hydroxyl function of the polyol.
R-N=C=O+HO-R'=>R-NHCOOR'
R-N=C=O+R'NH2=>R-NHCONHR'
R-N=C=O+H2O=>R-NHCOOH=>R-NH2+CO2

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 Catalogue - Polyester Polyols 


  


  



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