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Polyurethane foam reconstitution
| Details |
Inventors: Wiggins, Edwin W.; Carpenter, James F.;
Assignee: McDonnell Douglas Corporation (St. Louis, MO)
Primary Examiner: Ivy; C. Warren
Assistant Examiner:
Attorney, Agent or Firm: Gravely, Lieder & Woodruff
This application describes a method of rejuvenating reticulated polyurethane materials, particularly those containing ester-type linkages which have been hydrolyzed after being exposed to moisture containing hydrocarbon fuel and/or highly humid environments. The process consists of treating the polyurethane with cross-linking compounds, such as diisocyanates and polyfunctional epoxy compounds. |
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DETAILED DESCRIPTION What is claimed is: 1.
The process of treating reticulated polyester urethane foam materials positioned in a fuel tank, said foam containing molecular linkages which have undergone hydrolysis and partial reversion comprising passing a reconstitution diisocyanate or polyfunctional epoxy compound through the fuel tank, and contacting the hydrolyzed polyurethane foam with said reconstitution material to produce a reconstituted foam structure in situ.
2.
The process of claim 1 including the step of attaching the cleaved portions of the polyurethane through the diisocyanate or polyfunctional epoxy material.
3.
The process of claim 1 wherein the reconstituting materials are combined with fuel and the mixture is placed in the fuel tank to reconstitute the foam.
4.
The process of claim 1 wherein the concentration of diisocyanate or polyfunctional epoxy compound to reticulated polyurethane is about 0.
25% to about 5%.
5.
The process of claim 1 wherein the foam is treated with the reconstituting material at a temperature of about 50 to about 100.
degree.
F.
for about 1 to about 10 hours.
6.
The process of claim 1 wherein the diisocyanate is selected from a group consisting of toluene diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, trimethylhexamethylene diisocyanate, and mixtures thereof.
7.
The process of treating reticulated polyurethane foam materials positioned in a fuel tank, said foam containing ester linkages which have undergone hydrolysis and partial reversion comprising treating the hydrolyzed polyurethane material in the fuel tank with a polyfunctional epoxy compound selected from a group consisting of diglycidyl ether of bis(4-hydroxyphenyl)dimethylmethane, polyglycidyl ether of tetraphenylene ethane, tetraglycidyl methylene dianiline, bis (epoxy cyclo pentyl) ether, tetra (p-glycidyloxyphenyl) ethane, triglycidyl p-aminophenol, and mixtures thereof, and forming a reconstituted foam structure in situ.
Description:
BACKGROUND OF THE INVENTION Polyurethane materials containing ester-type linkages are particularly vulnerable to hydrolysis
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