Use alkali and/or triethanolamine salts of the alkanoylamidocarb

Details Use alkali and/or triethanolamine salts of the alkanoylamidocarb Use alkali and/or triethanolamine salts of the alkanoylamidocarb

1998-07-05

2000-03-21

McAvoy, Ellen M.

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Organic -co- compound

508515, 554 56, 554 57, 554 58, 554 59, 72 42, C10M13306

Patent

active

060402814

DESCRIPTION:

BRIEF SUMMARY
The invention relates to alkali metal salts and triethanolamine salts of alkanoylamidocarboxylic acids, as have been disclosed as metal working compositions in AT 344 854 B. According to said publication, such salts have been used to date as corrosion-inhibiting coolants and metal working compositions. Most salts stated there gave good to very good corrosion protection in the machining of the workpieces. However, they exhibit undesirably strong foaming in modern high-speed metal working centres, owing to the large cooling lubricant circulation and the high delivery pressure. The addition of commercial antifoams results in only a partial improvement and in particular only briefly, and on the other hand occasionally gives rise to undesired side effects.
It is therefore the object of the invention to select those salts which exhibit a continuously low level of foaming behaviour which meets the requirements of modern NC machines. This is achieved in a surprising manner by alkali metal salts and/or triethanolamine salts of alkanoylamidocarboxylic acids of the general formula (A) ##STR3## in which R.sup.1 denotes an alkanoyl or an alkanesulfonyl radical, each having 6 to 20 carbon atoms; ##STR4## R.sup.3 denotes the radical R.sup.2 or ##STR5## R.sup.4 denotes a hydrogen atom or an alkane radical having 1 to 3 carbon atoms; percent by weight of the concentrate of corrosion-inhibiting metal working compositions in aqueous solution, as antifoams.
They include virtually exclusively salts of monoalkanoylethylenediaminetriacetic or monoalkanoylethylenediaminetripropionic acids, monoalkanoyldiethylenetriaminetetraacetic or monoalkanoyldiethylenetriaminetetrapropionic acids, monoalkanoyltriethylenetetraminepentaacetic or monoalkanoyltriethylenetetraminepentapropionic acids or monoalkanoyltetraethylenepentaminehexaacetic or monoalkanoyltetraethylenepentaminehexapropionic acids, i.e.:
In 2% aqueous solution, salts of these acids give such low-foam cooling lubricants that they no longer give rise to any troublesome foam development even with the largest cooling lubricant circulation and delivery pressures up to 20 bar.
The foam behaviour of the above-mentioned compounds was now tested by the perforated-disc beating method according to DIN 53902, Part 1, compounds of the Austrian Patent mentioned at the outset, namely the triethanolamine salts of N,N'-diisononanoylethylenediamine-N,N'-diacetic acid (A) or of N,N'-diisononanoylethylenediamine-N,N'-dipropionic acid (B), exhibiting very disadvantageous foaming behaviour.


TABLE 1 __________________________________________________________________________ Triethanol- Foam height Foam height Foam height Foam height amine salt of Concentration (in mm) immediately (in mm) (in mm) (in mm) compound No. (in % by weight) after beating after 10 sec after 20 sec after 30 sec __________________________________________________________________________ Blank distilled 10 0 0 0 sample water A 2% 100 70 58 40 B 2% 105 72 60 41 1 2% 13 2 0 0 2 2% 15 1 0 0 3 2% 15 2 0 0 4 2% 15 1 0 0 5 2% 15 2 0 0 6 2% 15 2 0 0 7 2% 12 0 0 0 8 2% 13 0 0 0 9 2% 16 3 0 0 10 2% 16 2 0 0 11 2% 17 4 0 0 12 2% 17 4 0 0 __________________________________________________________________________
As shown in Table 1, for example A gave a foam height of 100 mm immediately after beating, which was still 70 mm after 10 sec, 58 mm after 20 sec and declined to 7 mm only after 180 sec. In contrast, the compounds according to the invention exhibited a substantially more advantageous foam behaviour.
Interestingly, the foam effect of other salts, in particular of those salts protected in the Austrian Patent mentioned at the outset, but also of those other, conventional, water-miscible cooling lubricants and metal working compositions, for example also of oil emulsions, is greatly reduced merely by adding small amounts of only 5 to 40, preferably 10 to 30, % by weight of the compounds according to the invention. With additions

REFERENCES:
patent: 4144182 (1979-03-01), Bereuter
patent: 5254277 (1993-10-01), Gentit et al.
patent: 5401428 (1995-03-01), Kalota et al.

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