Use alkali and/or triethanolamine salts of the alkanoylamidocarboxylic acids in metal working
AssigneeHeinz Bereuter
InventorsHeinz Bereuter, Thomas Bereuter, Wolfgang Bereuter, Ingrid Kohlhaupt
Life of this patent
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Abstract
At least 5, preferably at least 30, in particular about 50, percent by weight of the alkali metal salts and/or triethanolamine salts of alkanoylamidocarboxylic acids of the general formula ##STR1## R.sup.1 denotes an alkanoyl or an alkanesulfonyl radical, each having 6 to 20 carbon atoms, ##STR2## R.sup.4 denotes a hydrogen atom; m is 2; n is 0 or 1, and z denotes an integer from 0 to 3; are used as antifoams in corrosion-inhibiting metal working compositions.
Claims6
A method to reduce foaming of corrosion-inhibiting metal working compositions, comprising the steps of
- selecting at least one of alkali metal salts and triethanolamine salts of alkanoylamidocarboxylic acids of a general formula ##STR6## R.sup.1 denoted an alkanoyl or an alkanesulfonyl radical, each having 6 to 20 carbon atoms,
- R.sup.2 denotes the radical ##STR7## R.sup.3 denotes the radical --R.sup.2 or ##STR8## R.sup.4 denotes a hydrogen atom;
- m is 2
- n is 0 or 1
- z denotes an integer form 0 to 3, and
- adding an amount of at least 5 percent by weight to a concentrate of said corrosion-inhibiting metal working compositions in aqueous solution, as antifoams.
Water-miscible, mineral oil-containing cooling lubricants and metal working compositions, containing 5 to 40 percent by weight of at least one of alkali metal salts and triethanolamine salts of alkanoylamidocarboxylic acid of a general formula ##STR9## R.sup.1 denoted an alkanoyl or an alkanesulfonyl radical, each having 6 to 20 carbon atoms,
- R.sup.2 denotes the radical ##STR10## R.sup.3 denotes the radical --R.sup.2 or ##STR11## R.sup.4 denotes a hydrogen atom;
- m is 2
- n is 0 or 1
- z denotes an integer form 0 to 3
- in an amount of at least 5 percent by weight of a concentrate of corrosion-inhibiting metal working compositions in aqueous solution, as antifoams.
Dependencies are inferred from the claim text.