Acid inhibitor compositions for metal cleaning and/or pickling
An acid inhibitor concentrate is provided which contains water, at least one polyamino-aldehyde resin such as a quaternized polyethylenepolyamine-glyoxal resin, and at least one compound selected from the group consisting of acetylenic alcohols, ethoxylated fatty amines, ethoxylated fatty amine salts, and aldehyde-releasing compounds (such as hexamethylenetetramine). Such concentrates form useful metal cleaning and pickling solutions when combined with aqueous acid, wherein such solutions, when contacted with a metal surface, are effective in removing scale, smut and other deposits from the metal surface but exhibit a reduced tendency for the aqueous acid to attack or etch the metal itself.
1. An acid inhibitor concentrate comprising water, at least one quaternized polyamino-aldehyde resin and at least one compound selected from the group consisting of aldehyde-releasing compounds, ethoxylated fatty amines, ethoxylated fatty amine salts and acetylenic alcohols.
2. The acid inhibitor concentrate of claim 1 wherein said aldehyde-releasing compounds comprise at least one formaldehyde-releasing compound.
3. The acid inhibitor concentrate of claim 1 wherein the said aldehyde-releasing compounds comprise at least hexamethylenetetramine or a salt thereof.
4. The acid inhibitor concentrate of claim 1 wherein the acid inhibitor concentrate comprises at least one of: at least one polyethylenepolyamine-aldehyde resin, at least one polyamino-glyoxal resin and at least one polyethylenepolyamine-glyoxal resin.
5. The acid inhibitor concentrate of claim 1 wherein the acid inhibitor concentrate comprises at least one polyethylenepolyamine-glyoxal resin obtained by reacting a quaternized polyethylenepolyamine with glyoxal.
6. The acid inhibitor concentrate of claim 5 wherein the quaternized polyethylenepolyamine is obtained by reacting a polyethylenepolyamine with benzyl chloride.
7. The acid inhibitor concentrate of claim 1 , comprising:
a. at least one ethoxylated fatty amine or salt thereof; and
b. at least one aldehyde-releasing compound or at least one acetylenic alcohol.
8. The acid inhibitor concentrate of claim 1 , comprising at least one quaternized polyethylenepolyamine-glyoxal resin, hexamethylenetetramine or salt thereof, and at least one ethoxylated fatty amine or salt thereof.
9. The acid inhibitor concentrate of claim 1 , comprising less than 1 weight percent free formaldehyde.
10. The acid inhibitor concentrate of claim 1 , wherein said acetylenic alcohols comprise at least 2-butyne-1,4-diol.
11. A solution comprising water, at least one non-oxidizing acid, at least one quaternized polyamino-aldehyde resin, and at least one compound selected from the group consisting of aldehyde-releasing compounds, ethoxylated fatty amines, ethoxylated fatty amine salts and acetylenic alcohols.
12. The solution of claim 11 wherein the solution comprises at least one formaldehyde-releasing compound.
13. The solution of claim 11 wherein the solution comprises at least one polyethylenepolyamine-glyoxal resin obtained by reacting a quaternized polyethylenepolyamine with glyoxal.
14. The solution of claim 13 wherein the quaternized polyethylenepolyamine is obtained by reacting a polyethylenepolyamine with benzyl chloride.
15. The solution of claim 11 , comprising at least one quaternized polyethylenepolyamine-glyoxal resin, hexamethylenetetramine or salt thereof, and at least one ethoxylated fatty amine or salt thereof.
16. The acid inhibitor concentrate of claim 1 , wherein said quaternized polyamino-aldehyde resin is present in the concentrate in an amount of about 0.5 to about 15 wt. % and said aldehyde-releasing compounds is present in the concentrate in an amount of about 1 to about 40 wt. %.
17. The acid inhibitor concentrate of claim 16 , wherein said aldehyde-releasing compounds comprises at least hexamethylenetetramine or a salt thereof.
18. The acid inhibitor concentrate of claim 17 , wherein said quaternized polyamino-aldehyde is present in the concentrate in an amount of about 1 to about 10 wt. % and said aldehyde releasing compounds is present in the concentrate in an amount of about 5 to about 40 wt. % and the weight ratio of said aldehyde-releasing compounds to said polyamino-aldehyde resin is from about 1:1 to 10:1.
19. The acid inhibitor concentrate of claim 16 further comprising about 0.5 to about 15 wt. % of acetylenic alcohol.
20. The acid inhibitor concentrate of claim 1 wherein the acid inhibitor concentrate comprises at least one polyethylenepolyamine-aldehyde resin.
21. The acid inhibitor concentrate of claim 1 wherein the acid inhibitor concentrate comprises at least one polyamino-glyoxal resin.
22. The acid inhibitor concentrate of claim 1 wherein the acid inhibitor concentrate comprises at least one polyethylenepolyamine-glyoxal resin.
23. The acid inhibitor concentrate of claim 1 , comprising at least one ethoxylated fatty amine or salt thereof and at least one aldehyde-releasing compound.
24. The acid inhibitor concentrate of claim 1 , wherein said acid inhibitor concentrate is free of acetylenic alcohol.
25. The acid inhibitor concentrate of claim 1 , wherein said acid inhibitor concentrate is free of fluorosurfactant.
26. The acid inhibitor concentrate of claim 1 , wherein said acid inhibitor concentrate has a pH of from about 4 to about 6.
27. The acid inhibitor concentrate of claim 1 , wherein said acid inhibitor concentrate has a pH of greater than about 7 and a free formaldehyde content of less than about 0.1 weight percent.
28. The acid inhibitor concentrate of claim 1 , comprising at least one ethoxylated fatty amine or salt thereof and at least one acetylenic alcohol.
29. The solution of claim 11 wherein said aldehyde-releasing compounds comprise hexamethylenetetramine or a salt thereof.
30. The solution of claim 11 wherein the solution comprises at least one polyethylenepolyamine-aldehyde resin.
31. The solution of claim 11 wherein the solution comprises at least one polyamino-glyoxal resin.
32. The solution of claim 11 wherein the solution comprises at least one polyethylenepolyamine-glyoxal resin.
33. The solution of claim 11 , comprising at least one ethoxylated fatty amine.
34. The solution of claim 11 , wherein said solution comprises hydrochloric acid.
35. The solution of claim 11 , wherein said solution has a pH of less than about 3.
36. The solution of claim 11 , wherein said solution is comprised of 2-butyne-1,4-diol.