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Urethane foams from animal fats: X. urethane polyols from epoxidized tallow, trimethylolpropane, and propylene oxide1
Author(s) -
Bilyk A.,
Saggese E. J.,
Monroe H. A.,
Zubillaga M. P.
Publication year - 1977
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/bf02670786
Subject(s) - trimethylolpropane , propylene oxide , isocyanate , blowing agent , polyol , catalysis , polymer chemistry , chemistry , materials science , organic chemistry , copolymer , polyurethane , polymer , ethylene oxide
A convenient three‐stage reaction has been devel‐oped for the preparation of polyols from epoxidized tallow (ET), trimethylolpropane (TMP), and propyl‐ene oxide (PO), without the previously required water washing step. ET is first heated with excess TMP under catalysis by BF 3 , causing rapid ring open‐ing of the oxirane function. In the second stage, KOH catalyzes ester interchange of TMP with the triglyc‐eride. Finally, PO is caused to react with free TMP and with other available hydroxylic components, to produce a homogeneous mixture of polyols. The polyols, all liquid at room temperature, were adjusted to equivalent weights of 100 and 120 with added triisopropanolamine and reacted with a polymeric isocyanate in the presence of a blowing agent to give low‐density rigid foams. Densities ranged from 1.6 to 1.8 lb/ft 3 and compressive strengths from 21 to 30psi.