Isocyanurate Carbodiimide foams (MDI)

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Foam for metal face panel. This is formulation for a water blown carbodiimide isocyanurate foam. Any flame or fire rating do not indicate that the foam under actual fire conditions will be flame retardant.  
The dimerization of isocyanates to form carbodiimides generates also carbon dioxide. The amount of water in a water blown foam can be reduced. This permits the generation of foams which have better properties and reduced friability.
Formulation Carbodiimide Isocyanurate Spray foam Carbon dioxide blown. Ref
Aromatic polyester  OH value 210 mg KOH/g

28.0

Bisphenol A propylene oxide (OH number 245) (CAS # 37353-75-6, 29694-85-7, 33393-97-4) 5.0
Tris(2-chloroethyl phosphate) CAS # 115-96-8 5.0
Silicone surfactant L-6900 1.6
2-Dimethylaminoethanol CAS # 108-01-0 0.4
(2-hydroxypropyl)trimethylammonium 2-ethylhexanoate CAS # 62314-22-1 2.0
1-Phenyl-3-methyl-2-phospholene 1-oxide CAS # 707-61-9 0.6

Water

1
Polymeric MDI (isocyanate equivalent 135) 100
Isocyanate index 300
Reaction profile, sec
Cream 16
Gel 46
Rise 67
Physical Properties of panel
Overall density, pcf (kg/m3) 3.1 (50)
Thermal conductivity mW/mK 22.7
Closed cell content, % 93
Compression strength 10 % strain, kPa 176
Friability (weight loss) % 28
Dimensional stability, 72 hours 80C, % -0.4
Dimensional stability,  72 hours -20C, % -0.1
Dimensional stability, 72 hours 70C, 98 % RH, % 0.5

The modification with the bisphenol A propylene oxide is necessary to improve the flexibility of the foam.

US Patents, 4,166,164 and 5,214,76
Aromatic o-phthalic polyester available from different sources

Last edited on:

November 16, 2006

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