Metalworking fluid

Patent metadata

Field	Value
Publication number	US-2018291301-A1
Application number	US-201816008714-A
Country	US
Kind code	A1
Filing date	Jun 14, 2018
Priority date	Dec 21, 2015
Publication date	Oct 11, 2018
Grant date	—

Abstract

A metalworking fluid includes a pH buffer system having one or more organic acids and one or more organic amines. The organic acids, which include aromatic carboxylic acids and C 10 or higher aliphatic carboxylic acids, may replace boric acid, such that boric acid may be excluded from the metalworking fluid. The organic acids may include at least one of phthalic acid, isophthalic acid, and terephthalic acid. The one or more organic amines include aliphatic and aromatic amines having an amine value of at least 50 mg KOH/g. A method of using the metalworking fluid includes shaping a metal by contacting the metal surface with a tool while cooling and lubricating at least one of the metal surface or tool with the metalworking fluid.

First claim

We claim:

1 . A metalworking fluid composition comprising water, oil, and a pH buffer system, the pH buffer system comprising one or more organic acids and one or more organic amines, wherein the organic acids are selected from the group consisting of aromatic carboxylic acids and C 10 or higher aliphatic carboxylic acids, and the one or more organic amines are selected from aliphatic and aromatic amines having an amine value of at least 50 mg KOH/g.

2 . A metalworking fluid composition comprising water, oil, and a pH buffer system, wherein the pH buffer system contains no boron and comprises one or more organic acids selected from the group consisting of aromatic carboxylic acids and C 7 or higher aliphatic carboxylic acids, and an alkalinity agent including one or more organic amines selected from aliphatic and aromatic amines having an amine value of at least 50 mg KOH/g.

3 . The metalworking fluid composition of claim 2 , wherein the aromatic carboxylic acid has a structure of: HOOCR—(C 6 H 4 )—R′COOH, R and R′ being independently selected from (CH 2 ) n , wherein 0≤n≤18.

4 . The metalworking fluid composition of claim 1 , wherein the aromatic carboxylic acid is selected from the group consisting of phthalic acid, isophthalic acid, and terephthalic acid.

5 . The metalworking fluid composition of claim 1 , wherein the aromatic carboxylic acid is terephthalic acid.

6 . The metalworking fluid composition of claim 5 , wherein the one or more organic amines are selected from monoethanolamine, methylpentamethylenediamine, and mixtures thereof.

7 . The metalworking fluid composition of claim 1 , wherein the one or more organic amines comprise a secondary amine.

8 . The metalworking fluid composition of claim 1 , wherein the composition has a pH in the range of 8.5 to 10.0.

9 . The metalworking fluid composition of claim 1 , wherein the one or more organic acids comprises at least one of a C 10 -C 18 aliphatic acid and a C 6 -C 30 aromatic dicarboxylic acid.

10 . The metalworking fluid composition of claim 1 , wherein the composition comprises 0.2 to 20% by weight of the one or more organic acids and about 0.1 to about 25% by weight of the one or more organic amines.

11 . The metalworking fluid composition of claim 1 , further comprising at least one additive selected from the group consisting of a hydrodynamic lubricant, a boundary lubricant, an extreme pressure lubricant, a cast iron corrosion inhibitor, a yellow metal corrosion inhibitor, an aluminum corrosion inhibitor, an emulsifier, a hydrotrope, a biocide, and a defoamer.

12 . The metalworking fluid composition of claim 1 , wherein the composition is free of boric acid and the salts thereof.

13 . The metalworking fluid composition of claim 1 , wherein the composition has a pH in the range of 8.5 and 10.0 and comprises 0.2 to 20% by weight of the one or more organic acids comprising a C 7 to C 30 saturated or unsaturated carboxylic acid.

14 . A method of metalworking comprising shaping a metal workpiece by contacting a surface of the metal workpiece with a tool while cooling and lubricating at least one of the metal surface or the tool with a metalworking fluid according to claim 1 .

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Kirsch Gabriel J

Classifications

• C10M2215/082

  containing hydroxyl groups; Alkoxylated derivatives · CPC title

• C10M2219/02

  Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds · CPC title

• C10N2030/24

  Emulsion properties · CPC title

• C10M2223/06

  having phosphorus-to-carbon bonds · CPC title

• C10M2207/126

  monocarboxylic · CPC title