Flushing solutions for coatings removal
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorNeil R. Wilson
Life of this patent
Estimating the term…
Abstract
A flushing solution containing: a) a solvent component, b) an alkaline source; and c) a corrosion inhibitor component is provided. The solvent component preferably contains an alkoxylated aromatic alcohol. The corrosion inhibitor component may contain a fatty acid salt, a mixture of an aliphatic phosphate ester and a buffering agent such as boric acid or phosphoric acid, a mixture of a fatty acid salt, aliphatic phosphate ester, and buffering agent, or a mixture of a fatty acid salt and buffering agent. Alkanolamines are preferably used to form the fatty acid salt and/or as the alkaline source. The flushing solutions can be prepared in stable concentrated form and are useful for removing coatings such as paint from substrate surfaces.
Claims62
A flushing solution composition comprising:
- an organic solvent component;
- a fatty acid salt;
- and
- an alkaline source.
A flushing solution composition comprising:
- a solvent component containing one or more alkoxylated aromatic alcohols each of which contains at least one aromatic ring and alkoxylate units of general formula I
- 9
- wherein:
- R1, R2, R3 and R4 are independently selected from hydrogen and methyl;
- R5 is hydrogen, a C1-C6 alkyl, or phenyl;
- and n is 2-10;
- an alkaline source;
- an aliphatic phosphate ester;
- and
- a buffering agent.
A flushing solution composition comprising:
- an aliphatic phosphate ester, wherein the aliphatic phosphate ester is an ethoxylate phosphate ester containing at least two —OCH2CH2— units per molecule;
- an alkaline source;
- and
- a buffering agent.
A method of making a flushing solution comprising:
- providing an organic solvent selected from the group consisting of alcohols, alkoxylated alcohols, glycols, glycol ethers, ketones, esters, and mixtures thereof;
- providing a fatty acid or salt thereof;
- providing a nitrogen-containing compound selected from the group consisting of amines, alkanolamines and mixtures thereof, wherein said nitrogen-containing compound is provided in stoichiometric excess relative to the fatty acid;
- and
- combining the organic solvent, fatty acid or salt thereof, and nitrogen-containing compound.
A method of making a flushing solution comprising:
- providing a solvent component comprising one or more alkoxylated aromatic alcohols each of which contains at least one aromatic ring and alkoxylate units of general formula I
- 14
- wherein:
- R1, R2, R3 and R4 are independently selected from hydrogen and methyl;
- R5 is hydrogen, a C1-C6 alkyl, or phenyl;
- and n is 2, 3, 4, 5 or 6;
- providing a fatty acid or a salt thereof;
- providing a nitrogen-containing compound selected from the group consisting of amines, alkanolamines, and mixtures thereof, wherein the nitrogen-containing compound is provided in stoichiometric excess relative to the fatty acid;
- and
- combining the solvent composition, the fatty acid or the salt thereof, and the nitrogen-containing compound.
A method of making a flushing solution comprising:
- providing a solvent component comprised of one or more alkoxylated aromatic alcohols each of which contains at least one aromatic ring and alkoxylate units of general formula I
- 17
- wherein:
- R1, R2, R3 and R4 are independently selected from hydrogen and methyl;
- R5 is hydrogen, a C1-C6 alkyl, or phenyl;
- and n is 2-10;
- providing an alkaline source, an aliphatic phosphate ester, and a buffering agent;
- and
- combining the solvent component, the alkaline source, the aliphatic phosphate ester, and the buffering agent.
A method of making a flushing solution comprising:
- providing a solvent component, an alkaline source, a buffering agent, and an aliphatic phosphate ester, wherein the aliphatic phosphate ester is an ethoxylate phosphate ester containing at least two —OCH2CH2— units per molecule;
- and
- combining the solvent component, the aliphatic phosphate ester, and the buffering agent.
A method of removing a coating material from a surface of a coating application apparatus comprising:
- providing a flushing solution concentrate comprising:
- a water-soluble or water-miscible organic solvent selected from the group consisting of alcohols, glycols, glycol ethers, alkoxylated alcohols, esters, ketones and mixtures thereof;
- a fatty acid salt;
- and an alkaline source;
- and
- mixing water with the flushing solution concentrate to obtain a diluted flushing solution containing from about 70% to about 98% by volume water;
- and
- contacting the diluted flushing solution with said coating material for a time and at a temperature effective to remove said coating material from said surface of said coating apparatus.
A method of removing a coating material from a surface of a coating application apparatus comprising:
- providing a flushing solution comprising a solvent component containing one or more alkoxylated aromatic alcohols each of which contains at least one aromatic ring and alkoxylate units of general formula I,
- 23
- wherein R1, R2, R3 and R4 are independently selected from hydrogen and methyl, R5 is hydrogen, a C1-C6 alkyl, or phenyl, and n is 2-10;
- a fatty acid salt;
- and an alkaline source;
- mixing water with the flushing solution concentrate to obtain a diluted flushing solution containing from about 70% to about 98% by volume water;
- and
- contacting the diluted flushing solution with said coating material for a time and at a temperature effective to remove said coating material from said surface of said coating application apparatus.
A method of removing a coating material from a surface of a coating application apparatus comprising:
- providing a flushing solution concentrate comprising a solvent component containing one or more alkoxylated aromatic alcohols each of which contains at least one aromatic ring and alkoxylate units of general formula I
- 24
- wherein:
- R1, R2, R3 and R4 are independently selected from hydrogen and methyl;
- R5 is hydrogen, a C1-C6 alkyl, or phenyl;
- and n is 2, 3, 4, 5 or 6;
- an aliphatic phosphate ester;
- a buffering agent;
- and an alkaline source;
- mixing water with the flushing solution concentrate to obtain a diluted flushing solution containing from about 70% to about 98% by volume water;
- and
- contacting the diluted flushing solution with said coating material for a time and at a temperature effective to remove said coating material from said surface of said coating apparatus.
A method of removing a coating material from a surface of a coating application apparatus comprising:
- providing a flushing solution concentrate comprising a solvent component;
- an aliphatic phosphate ester, wherein the aliphatic phosphate ester is an ethoxylate phosphate ester containing at least two —OCH2CH2— units per molecule;
- a buffering agent;
- and an alkaline source;
- mixing water with the flushing solution concentrate to obtain a diluted flushing solution containing from about 70% to about 98% by volume water;
- and
- contacting the diluted flushing solution with the coating material for a time and at a temperature effective to remove said coating material from said surface of said coating application apparatus.
A method of reducing the tendency of a surface of a substrate comprised of aluminum or an aluminum alloy to corrode when contacted with a flushing solution comprised of water, an organic solvent component, and an alkaline source, said method comprising incorporating into said flushing solution an effective amount of a corrosion inhibitor component comprised of at least one of a) a fatty acid, b) a fatty acid salt, or c) both an aliphatic phosphate ester and a buffering agent while maintaining a pH value in the flushing solution of at least about 8.
Dependencies are inferred from the claim text.