Cleaning solvent and method of cleaning a metal surface
AssigneeMcDonnell Douglas Corporation
InventorsMervin A. Danforth, Julian Giles, Saburo Nakahara
Life of this patent
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Abstract
The surfaces of organic polymeric coatings applied to detail parts or components are subject to contamination and ultraviolet degradation prior to final overcoating procedures. The sources of ultraviolet exposure are light transmission through windows, artificial lighting, or temporary exterior exposure of the detail part coated surface. The ultraviolet light altered surface layer is effectively removed by treatment with a mixture of a glycol ether, an alcohol, a ketone and deionized water, without removing the main body of the coating. This results in good adhesion of a subsequently applied touch-up coating or overcoating. The process can also be used for cleaning metals.
Claims10
A process for cleaning a metal surface for removal particularly of organic contaminants which comprises contacting said metal surface with a solution consisting essentially of a mixture of a glycol ether, an alcohol, a ketone and deionized water, employing 15-50% of said glycol ether, 5-15% of said alcohol, 3-11% of said ketone and 24-77% deionized water, by volume, said glycol ether being a monoalkyl ether of a glycol selected from the group consisting of ethylene glycol, diethylene glycol and dipropylene glycol, said monoalkyl group containing 1 to 6 carbon atoms, said alcohol being an aliphatic alcohol containing from 1 to 6 carbon atoms, said ketone being selected from the group consisting of an aliphatic ketone of from 3 to 8 carbon atoms and cycloaliphatic ketones of 5 to 6 carbon atoms.
A composition for removing an ultraviolet light altered polymeric coating or for cleaning a metal surface for removal particularly of organic contaminants, which consists essentially of 15-50% of a glycol ether, 5-15% of an alcohol, 3-11% of a ketone and 24-77% deionized water, by volume, said glycol ether being a monoalkyl ether of a glycol selected from the group consisting of ethylene glycol, diethylene glycol and dipropylene glycol, said monoalkyl group containing 1 to 6 carbon atoms, said alcohol being an aliphatic alcohol containing from 1 to 6 carbon atoms, said ketone being selected from the group consisting of an aliphatic ketone of from 3 to 8 carbon atoms and cycloaliphatic ketones of 5 to 6 carbon atoms.
A composition which when diluted with deionized water is suitable for removing an ultraviolet light altered polymeric coating, which consists essentially of 15-50 parts of a glycol ether, 5-15 parts of an alcohol and 3-11 parts of a ketone, by volume, said glycol ether being a monoalkyl ether of a glycol selected from the group consisting of ethylene glycol, diethylene glycol and dipropylene glycol, said monoalkyl group containing 1-6 carbon atoms, said alcohol being an aliphatic alcohol containing from 1 to 6 carbon atoms, and said ketone being selected from the group consisting of an aliphatic ketone of from 3 to 8 carbon atoms and cycloaliphatic ketones of 5 to 6 carbon atoms.
Dependencies are inferred from the claim text.