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Solvent‐blown rigid urethane foams from castor‐based polyols
Author(s) -
Lyon C. K.,
Garrett Vilma H.,
Goldblatt Leo A.
Publication year - 1961
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02636773
Subject(s) - polyol , castor oil , polyurethane , prepolymer , hydroxyl value , glycerol , chemical engineering , blowing agent , materials science , polymer , chemistry , solvent , plasticizer , organic chemistry , polymer chemistry , engineering
The preparation of trichlorofluoromethane‐blown rigid urethane foams using toluenediisocyanate and castor oil‐derived polyols was investigated. The castor‐based polyols included castor oil, hydroxylated castor oil, technical glycerol‐, penta‐erythritol‐, and sorbitol monoricinoleates, and N,N‐ bis (2‐hydroxyethyl) ricinoleamide. The last of these yielded the best foams when used as the sole polyol component added to the prepolymer. However better foams were obtained by using, as the polyol component, a mixture of a castor oil‐derived polyol and a lower‐molecular‐weight polyol with a higher hydroxyl content. These polyol mixtures yielded more highly cross‐linked polymers and hence foams with higher compressive strengths and less tendency to shrink after foaming. The effect of catalyst, silicone surfactant, and trichlorofluoromethane content was also investigated. An empirical relationship between density and compressive strength in a given foam system was derived.