Isocyanurate foams (MDI)

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This formulation utilizes a nonsilicone surfactant which is capped and not reactive with the isocyanate. A part of the surfactant is added to the isocyanate. These surfactants are block polymers of butylene oxide and ethylene oxide grafted onto an alcohol and Me ether capped.  A description of this chemistry can be found in US5,674,918 and  US5,600,019 assigned to Dow Chemical.
Formulation Isocyanurate Spray foam Carbon dioxide and HCFC blown
Aromatic polyester (phthalic anhydride based) OH value 235 mg KOH/g

100

Linear C10 alkyl ether grafted with butylene oxide and ethylene oxide and mono-Me ether (CAS # 111163-38-3) 0.6
1,1,4,7,7-Pentamethyldiethylenetriamine PMDETA (CAS # 3030-47-5) 0.2
Potassium octoate (CAS # 3164-85-0) 1.7

Water

0.5

HCFC-141b blowing agent (1,1-Dichloro-1-fluoro-ethane 34
Polymeric MDI (isocyanate equivalent 136) 172
Linear C10 alkyl ether grafted with butylene oxide and ethylene oxide and mono-Me ether (111163-38-3) 0.7
Isocyanate index 250
Reaction profile, sec
Initiation 12
Gel 38
Tack free 42
Rise 50
Physical Properties
Core density, pcf (kg/m3) 1.87 (30)
k-factor (BTU.in/ft2hrF) 0.12
Closed Cells, % 90
Friability (weight loss) % 4
Dimensional stability, cold age at -22F, DV 0.3
Dry age 200F, DV 4.1
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

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