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Amine catalysts for polyurethane foams

a technology of polyurethane foam and catalyst, which is applied in the field of polyurethane and polyisocyanurate foam, can solve the problems of partial decomposition of blowing agent, low foam quality, and inutility

Inactive Publication Date: 2017-03-30
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The use of sterically hindered amine catalysts in the polyol premix composition ensures the production of high-quality foams with a fine, uniform cell structure that maintains stability and does not collapse, even after aging, by reducing the reactivity with hydrohaloolefins and maintaining the molecular weight of silicone surfactants.

Problems solved by technology

If a surfactant is not used in the foaming composition, the bubbles simply pass through the liquid mixture without forming a foam or forming a foam with large, irregular cells rendering it not useful.
However, if the polyol premix composition is aged, prior to treatment with the polyisocyanate, the foams are of lower quality and may even collapse during the formation of the foam.
It has now been found that the origin of the problem is the reaction of certain amine catalysts with certain hydrohaloolefins including HFO-1234ze and HFCO-1233zd, resulting in partial decomposition of the blowing agent.
It has been found that, subsequent to the decomposition of the blowing agent, the molecular weight of the polymeric silicone surfactants, if present, is detrimentally altered, leading to poor foam structure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples 2-5 (comparative)

[0052]In these examples, other amines were evaluated similarly at 120° F. for 3 days using approximately equimolar amounts of amine and trans-1,3,3,3-tetrafluoropropene. The amine, pressure drop (%), physical change, and fluoride found are given.

[0053]1,8-Diazabicyclo[5.4.0]undecene-7, 80%, red-orange solid, >5 weight %; 1,4-diazabicyclooctane in dipropylene glycol (DABCO 33-LV®), 25%, orange viscous liquid, >5 weight %; N-methylcyclohexylamine, 86%, white precipitate followed by orange liquid, >5 weight %; N-isopropylmethylamine, 78%; orange solution; >5 weight %. The drop in pressure during the test, the presence of solid, and the change in color are all indications of reaction between the amine and olefin. The % fluoride ion in the residue is a quantitative measurement of the extent of reaction. Greater than 5 wt % fluoride is unacceptably high and represents extensive decomposition of the olefin.

examples 6-8 (comparative)

[0054]These amines were treated with trans-1,3,3,3-tetrafluoropropene at room temperature (77-78 F) for 3 days. N-methylcyclohexylamine, 48%, yellow-orange solid, 5 wt %;

[0055]Di-n-propylamine, 56%, precipitate in 30 minutes; >5 wt %; Isopropylamine, 45%, solid in 5 minutes, >5 wt %. In these examples, decomposition of the olefin was still extensive, even at room temperature.

example 10-17

[0057]The following amines were heated 3 days at 120 F with trans-1,3,3,3-tetrafluoropropene (trans-HFO-1234ze) using approximately equimolar amounts of amine and HFO-1234ze. The amine and fluoride found are given. Dimethylcyclohexylamine (Polycat 8), 1970 ppm; diisopropylamine, 7650 ppm; dicyclohexylmethylamine (Polycat 12), 480 ppm; diisopropylethylamine, 67 ppm; dicyclohexylamine, 942 ppm; di-sec-butylamine, 203 ppm; t-butylisopropylamine, 237 ppm; dimethylisopropylamine, 3474 ppm. Using these amines, the amount of fluoride produced (and therefore the amount of olefin decomposition) in the three-day test was much less than that in the comparative examples. The amount of fluoride produced generally decreased with increasingly hindered amines.

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Abstract

The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to open-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a sterically hindered amine catalyst.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a division of U.S. application Ser. No. 12 / 241,606, filed Sep. 30, 2008 which application claims the benefit of co-pending Provisional patent application Ser. No. 60 / 979,453 filed Oct. 12, 2007, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]Field of the Invention[0003]The present invention pertains to polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to rigid, polyurethane and polyisocyanurate foams and methods for their preparation, which foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with an organic polyisocyanate and a polyol premix composition which comprises a combination of a blowing agent, which is preferably a hydrohaloolefin, a polyol, a silicone surfactant, and an amine catalyst.[0004]Description of the Related Art[0005]The class of foams known as...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08G18/18C08J9/14
CPCC08G18/1808C08J9/146C08G18/1816C08J2375/04C08G2101/0025C08J2205/046C08J2203/164C08J2205/10C08G18/40C08J9/144C08J9/149C08J2203/162C08J2203/18C08G2101/00C08G2115/02C08G18/08C08G18/10C08G18/18C08G2110/0025
Inventor VAN DER PUY, MICHAELWILLIAMS, DAVID J.NAIR, HARIDASAN K.NALEWAJEK, DAVID
Owner HONEYWELL INT INC
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