Isocyanurate foams (MDI)

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This is formulation for a pentane blown isocyanurate foam. Any flame or fire rating do not indicate that the foam under actual fire conditions will be flame retardant.
Formulation Isocyanurate Spray foam Carbon dioxide and Pentane blown. Ref
Aromatic polyester (phthalic anhydride based) OH value 235 mg KOH/g

100

2-(2-hydroxyethoxy)ethyl 2-hydroxypropyl 3,4,5,6-tetrabromophthalate  diol (CAS # 20566-35-2) 7.5
Tris(2-chloropropyl) phosphate (CAS # 6145-73-9) 15
Silicone surfactant 3.1
1,1,4,7,7-Pentamethyldiethylenetriamine PMDETA (CAS # 3030-47-5) 0.6
Potassium octoate (CAS # 3164-85-0) 3.7

Water

1.5

n-Pentane (CAS # 109-66-0) 25
Polymeric MDI (isocyanate equivalent 135) 282
Isocyanate index 340
Reaction profile, sec
Cream 2
Gel 22
Physical Properties
Core density, pcf (kg/m3) 2.1 (33.6)
k-factor (BTU.in/ft2hrF) (after 2 month) 0.17
Closed Cells, % 90
Friability (weight loss) % 4
Dimensional stability, cold age at -30C, DV 0
Dry age 100C, DV 0
ASTM E-84 Flame spread/ smoke developed 30/90
The isocyanurate formation in the foam will depend on temperature and catalyst concentration. At lower temperature the catalyst might have to be increased.
"Improved Hydrocarbon Blown Foams for North America" W.J. Nicola and U. Weber. Bayer (1999) SPE PU Div.
Aromatic Polyester
Value Range Hydroxyl
Value(mgKOH/g)    Average
Viscosity
(cps@25C)
Functionality Acidity
(mgKOH/g)
Equivalent
Weight 
Specific Gravity
(g/ml)
230 - 242 2,700 - 5,500 2.0 0.4 - 1.0 238 1.2

Last edited on:

November 16, 2006

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