Isocyanurate foams (MDI)

Rigid foams for housing insulation require to meet certain flammability standard and also cost requirements. It is possible to be environmentally sound by using recycle PET in the preparation of the foam.
Formulation Isocyanurate Spray foam Carbon dioxide and HCFC blown
Polyester polyol OH value 327 mg KOH/g


Ethylenediamine propoxylated OH value 450 mg KOH/g (CAS # 102-60-3) 10
Silicone surfactant 2
Tris(2-chloropropyl) phosphate (CAS # 6145-73-9) 20



HCFC-141b blowing agent (1,1-Dichloro-1-fluoro-ethane CAS # 1717-00-6 35
Lead Octoate (20 % Pb) 2
Triethylenediamine 33 %, (CAS # 280-57-9) 5
Trimerization catalyst (2-hydroxypropyl)trimethylammonium 2-ethylhexanoate, (CAS # 62314-22-1) 5.8
Polymeric crude MDI (CAS # 9016-87-9) NCO index 200
Aromatic polyester diol from recycled polyethylene terephthalate
Lead octoate can be replaced with an environmentally more acceptable catalyst such as Bismuth octoate

The isocyanurate formation in the foam will depend on temperature and catalyst concentration. At lower temperature the catalyst might have to be increased.

Last edited on:

November 16, 2006

Copyright, Design, Layout and Technical Content by: