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Curing of Polyurethane Pre‐polymers on Wool. I—Air, Press and Steam Curing
Author(s) -
Rippon J. A.,
White M. A.
Publication year - 1972
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1972.tb03034.x
Subject(s) - curing (chemistry) , polyurethane , wool , solvent , petrochemical , materials science , polymer , humidity , isocyanate , pressing , respirator , pulp and paper industry , composite material , chemistry , chemical engineering , waste management , organic chemistry , engineering , physics , thermodynamics
After application to woo) from organic solvent, isocyanate‐terminated polyurethane pre‐polymers are usually cured by exposure to the atmosphere for 4–8 days. The activity of the resin and the humidity of the atmosphere have an important effect on the rate of curing. Complete development of the shrink‐resisting effect can be achieved in 15 min or less by steam‐pressing or by exposure to saturated steam at 100d̀C. The suggested industrial procedures are to tumble in a dryer that has provision for open steam injection or to hang in a steam‐box. Reduction of the curing time by application of an organometallic catalyst with the resin tends to cause difficulties in maintenance of the solvent machine and in garment pressing.