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There is a major market for siloxane surfactants for polyurethane foams. Siloxanes give lower surface tension than typical surfactants which use hydrocarbon hydrophobes. The typical siloxane surfactant for polyurethane foams is a nonionic block copolymer of a methyl siloxane and polyethylene glycol. Surfactants used with isocyanates are end capped and do not have any hydroxyl end groups. Silicone surfactants have shown to be a major contributor to fogging in car seating. Non-silicone surfactants based on butylene oxide-ethylene oxide block polymer have found a market in low fogging foams. The addition of surfactants to both the polyol and the isocyanate has shown to improve the cell structure in MDI foams

Chemical Name Composition

CAS#

Function

Reference
       

Silicone surfactants

 
Siloxanes and Silicones, di-Me, 3-hydroxypropyl Me, ethoxylated propoxylated  68937-55-3 Surfactant for polyol Reactive
Siloxanes and Silicones, di-Me, 3-hydroxypropyl Me, ethers with polyethylene-polypropylene glycol mono-Me ether 67762-85-0 Surfactant for isocyanate Non reactive Silwet L 7001
Silwet L 7605
Tegopren 5878
Polyoxyalkylene siloxanes and silicones 87244-72-2
Glycols, polyethylene, methyl 3-[1,3,3,3-tetramethyl-1-(trimethylsiloxy)disiloxanyl]propyl ether 27306-78-1 Silwet L-77
Poly(oxy-1,2-ethanediyl), a-acetyl-w-[3-[1,3,3,3-tetramethyl-1-[(trimethylsilyl)oxy]disiloxanyl]propoxy]- 125997-17-3 Silwet Y 12808
Siloxanes and silicones, dimethyl, 3-hydroxypropyl methyl, ethoxylated  68937-54-2 Silwet FZ 2171
3-(Polyoxyethylene)propylheptamethyltrisiloxane 67674-67-3 Dow Corning 5212
Silwet 408
Di-Me siloxanes, hydroxy-terminated, ethoxylated 63148-55-0 Dow Corning 4-3667 Silicone DC 470A
 

Nonsilicone surfactant

 
Butylene oxide propylene oxide block copolymer 27637-03-2 27517-34-6 Surfactant for polyol US5,674,918 US5,600,019
Alcohols, C9-11-branched and linear, ethers with ethyloxirane-oxirane polymer mono-Me ether 111163-38-3 

Surfactant for isocyanate

Capped
1,2-Butylene oxide-ethylene oxide copolymer ether with dodecyl alcohol 39454-63-2 Surfactant for polyol
Allyloxypolyethyleneglycol methyl ether 27252-80-8 Additive to surfactants
 
 

Last edited on:

November 14, 2006

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