Process for manufacturing closed cell phenolic foams

Details Process for manufacturing closed cell phenolic foams Process for manufacturing closed cell phenolic foams

C - Chemistry, Metallurgy

08

J

403/54

C08J 9/14 (2006.01) C08J 9/00 (2006.01) C08L 61/06 (2006.01)

Patent

CA 1313289

PROCESS FOR MANUFACTURING CLOSED CELL PHENOLIC FOAMS A B S T R A C T This invention relates to the manufacture of closed cell phenolic foams from low viscosity phenol- formaldehyde resole resin. This method of manufacture provides a foam which exhibits many of the advantageous characteristics of phenolic foams manufactured from high viscosity resole resin, including good thermal retention. There is provided a method of making a phenolic foam comprising the steps of mixing (a) a phenol-formaldehyde resole resin having a water content of approximately 7.5% and a viscosity of approximately 2,800 cps at 40°C; (b) a high molecular weight gel forming ethylene oxide - propylene oxide block copolymer surfactant, such as Pluronic F-127 (trade mark); (c) a catalyst; (d) a blowing agent; and curing the resulting foam.

571782

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