Claims
- 1. An organic solvent-free aqueous metal cleaning composition comprising at least one alkaline salt and a surfactant, said surfactant comprises from about 10 wt. % to about 50 wt. % of the cleaning composition based on dry components of the cleaning composition, said surfactant consists essentially of non-phenolic alkoxylated nonionic surfactants, N-alkyl pyrrolidones and mixtures thereof, an aqueous solution containing about 0.1 to about 20% of said composition being characterized as having complete phase separation ability of contaminants whereby the contaminants form a distinct and substantially complete phase from the aqueous solution, said composition having a phosphate content of less than 3 wt. % based on phosphorous, and having an initial foam height at or below point 0, U in FIG. 1 and a foam collapse time bounded by points U, W, X and Z of FIG. 1.
- 2. The composition of claim 1, wherein the initial foam height is at or below point 0, V in FIG. 1 and a foam collapse time bounded by points V, W, X and Y of FIG. 1.
- 3. The composition of claim 1, wherein the surfactant comprises from 10 wt. % to about 30 wt. % of the composition.
- 4. The composition of claim 1, wherein the alkaline salt has buffer capacity.
- 5. The composition of claim 1, providing a pH of from 8.0 to about 12.0 when present in amounts of 0.1 to 20 wt. % in aqueous solution.
- 6. The composition of claim 5, providing a pH of from above 11.0 to less than 12.0 when present in amounts of 0.1 to 20 wt. % in aqueous solution.
- 7. The composition of claim 1, wherein said alkaline salts comprise alkali metal carbonates, alkali metal bicarbonates and mixture thereof.
- 8. The composition of claim 1, wherein said surfactant comprises an ethoxylated or ethoxylated-propoxylated compound.
- 9. The composition of claim 1, further comprising a silicate.
- 10. The composition of claim 1, further containing magnesium and/or zinc ions and 0.3 to 2 wt. % of a carboxylated polymer.
- 11. The composition of claim 1, further comprising an anticorrosion agent comprising a triazole compound in combination with an alkali metal borate.
- 12. The composition of claim 11, wherein a weight ratio of the triazole compound to the alkali metal borate is about 1:1.
- 13. The composition of claim 11, wherein the triazole compound is a water soluble 1,2,3-triazole.
- 14. The composition of claim 13, wherein the triazole compound comprises 1,2,3-benzotriazole; 4-phenyl-1,2,3-triazole; 1,2-naphthotriazole; 4-nitrobenzotriazole; 1,2,3-tolyltriazole; 4-methyl-1,2,3-triazole; 4-ethyl-1,2,3-triazole; 5-methyl-1,2,3-triazole; 5-ethyl-1,2,3-triazole; 5-propyl-1,2,3-triazole; or 5-butyl-1,2,3-triazole.
- 15. The composition of claim 11, wherein the alkali metal borate comprises sodium tetraborate pentahydrate, sodium tetraborate decahydrate, or mixtures thereof.
- 16. The composition of claim 1, wherein the aqueous solution is capable of separation from an oil with a viscosity of from about 2 to about 10000 cp at 25.degree. C. such that the oil forms a distinct and substantially complete phase from the aqueous solution.
- 17. The composition of claim 1, wherein there is substantially no aqueous phase drag out from the aqueous solution into the contaminant phase.
- 18. An aqueous cleaning concentrate comprising about 5 to about 40 wt. % of an organic solvent-free cleaning composition containing at least one alkaline salt and a surfactant, said surfactant comprises from about 10 wt. % to about 50 wt. % of the cleaning composition based on dry components of the cleaning composition, said surfactant consists essentially of non-phenolic alkoxylated nonionic surfactants, N-alkyl pyrrolidones and mixtures thereof, said concentrate being characterized as having a phosphate content of less than 3 wt. % of the composition based on phosphorous, said concentrate further having complete phase separation ability of contaminants whereby the contaminants form a distinct and substantially complete phase from the aqueous concentrate, and having an initial foam height at or below point 0, U in FIG. 1 and a foam collapse time bounded by points U, W, X and Y of FIG. 1.
- 19. The concentrate of claim 18, wherein the initial foam height is at point 0, V in FIG. 1 and a foam collapse time bounded by points V, W, X and Y of FIG. 1.
- 20. The concentrate of claim 18, wherein the concentrate has a pH of from 8.0 to about 12.0.
- 21. The concentrate of claim 20, wherein the pH ranges from above 11.0 to less than 12.0.
- 22. The concentrate of claim 20, wherein said alkaline salts comprise alkali metal carbonates, alkali metal bicarbonate and mixture thereof.
- 23. The concentrate of claim 18, wherein said non-phenolic alkoxylated nonionic surfactant comprises an ethoxylated or ethoxylated-propoxylated compound.
- 24. The concentrate of claim 23, wherein said surfactant comprises an ethoxylated thiol surfactant having 7-20 carbon atoms and is ethoxylated with 3-20 ethylene oxide units.
- 25. The concentrate of claim 18, comprising about 60-90 wt. % water, and about 5-15 wt. % of the alkaline salts.
- 26. The concentrate of claim 18, further comprising a corrosion inhibitor selected from the group consisting of magnesium ions, zinc ions, silicate and mixtures thereof.
- 27. The concentrate of claim 18, further comprising an anticorrosion agent comprising a triazole compound in combination with an alkali metal borate.
- 28. The concentrate of claim 27, wherein the triazole compound comprises a water soluble 1,2,3-triazole.
- 29. The concentrate of claim 28, wherein the 1,2,3-triazole compound comprises 1,2,3-benzotriazole; 4-phenyl-1,2,3-triazole; 1,2-naphthotriazole; 4-nitrobenzotriazole, 1,2,3-tolyltriazole; 4-methyl-1,2,3-triazole; 4-ethyl-1,2,3-triazole; 5-methyl-1,2,3-triazole; 5-ethyl-1,2,3-triazole; 5-propyl-1,2,3-triazole; or 5-butyl-1,2,3-triazole.
- 30. The concentrate of claim 27, wherein the alkali metal borate comprises sodium tetraborate pentahydrate, sodium tetraborate decahydrate, or mixtures thereof.
- 31. The concentrate of claim 18, further including a hydrotrope.
- 32. The concentrate of claim 31, wherein said hydrotrope comprises an alkali metal salt of a linear C.sub.7 -C.sub.13 carboxylic acid.
- 33. The concentrate of claim 18, wherein the alkaline salt has a buffer capacity.
- 34. The concentrate of claim 18, wherein there is substantially no aqueous phase drag out from the aqueous concentrate into the contaminant phase.
Parent Case Info
The present application is a continuation application of abandoned U.S. application Ser. No. 08/311,268, filed Sep. 23, 1994.
US Referenced Citations (36)
Foreign Referenced Citations (3)
Number |
Date |
Country |
06306661 A |
Nov 1994 |
JPX |
782898 |
May 1954 |
GBX |
WO 9500611 |
Jan 1995 |
WOX |
Continuations (1)
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Number |
Date |
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Parent |
311268 |
Sep 1994 |
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