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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 |
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Aromatic polyester (phthalic anhydride based) OH value
235 mg KOH/g |
100 |
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Linear C10 alkyl ether grafted with butylene
oxide and ethylene oxide and mono-Me ether (CAS # 111163-38-3) |
0.6 |
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1,1,4,7,7-Pentamethyldiethylenetriamine PMDETA
(CAS # 3030-47-5) |
0.2 |
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Potassium octoate (CAS # 3164-85-0) |
1.7 |
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Water |
0.5 |
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HCFC-141b blowing agent (1,1-Dichloro-1-fluoro-ethane) |
34 |
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Polymeric MDI
(isocyanate equivalent 136) |
172 |
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Linear C10 alkyl ether grafted with butylene
oxide and ethylene oxide and mono-Me ether (111163-38-3) |
0.7 |
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Isocyanate index
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250
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Reaction profile, sec
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Initiation
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12
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Gel
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38
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Tack free
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42
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Rise
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50
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| Physical Properties |
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| Core density, pcf (kg/m3) |
1.87 (30)
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| k-factor (BTU.in/ft2hr°F) |
0.12
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| Closed Cells, % |
90
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| Friability (weight loss) % |
4
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| Dimensional stability, cold age at -22°F,
DV |
0.3
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| Dry age 200°F, DV |
4.1
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The isocyanurate formation in the foam will depend on temperature
and catalyst concentration. At lower temperature the catalyst might
have to be increased.
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Last edited on:
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November 16, 2006
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Copyright®, Design, Layout and Technical Content by:
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