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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.
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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.
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| Formulation Carbodiimide Isocyanurate Spray foam Carbon dioxide
blown. Ref |
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Aromatic polyester OH value 210 mg KOH/g |
28.0 |
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Bisphenol A propylene oxide (OH number 245)
(CAS # 37353-75-6,
29694-85-7, 33393-97-4) |
5.0 |
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Tris(2-chloroethyl phosphate) CAS
# 115-96-8 |
5.0 |
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Silicone surfactant
L-6900 |
1.6 |
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2-Dimethylaminoethanol CAS
# 108-01-0 |
0.4 |
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(2-hydroxypropyl)trimethylammonium 2-ethylhexanoate
CAS # 62314-22-1 |
2.0 |
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1-Phenyl-3-methyl-2-phospholene 1-oxide
CAS
# 707-61-9 |
0.6 |
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Water |
1 |
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Polymeric MDI
(isocyanate equivalent 135) |
100 |
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Isocyanate index
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300
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Reaction profile, sec
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Cream
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16
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Gel
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46
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| Rise |
67
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| Physical Properties of panel |
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| Overall density, pcf (kg/m3) |
3.1 (50)
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| Thermal conductivity
mW/mK |
22.7
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| Closed cell content, % |
93
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| Compression strength 10 % strain,
kPa |
176
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| Friability (weight loss) % |
28
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| Dimensional stability, 72 hours
80°C, % |
-0.4
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| Dimensional stability, 72
hours -20°C, % |
-0.1
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| Dimensional stability, 72 hours
70°C, 98 % RH, % |
0.5
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The modification with the bisphenol A propylene oxide is
necessary to improve the flexibility of the foam. |
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US Patents, 4,166,164 and 5,214,76
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Aromatic o-phthalic polyester
available from different sources
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