# US 10,479,917 B2 · Water-soluble cutting/grinding fluid

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- Number: US 10,479,917 B2
- Document ID: US10479917B2
- Status: Granted
- Kind: B2
- Application number: 14/894,690
- Filed: 2014-05-28
- Published: 2016-04-21
- Granted: 2019-11-19
- Earliest claimed: 2013-05-31
- Assignees: Ntn Corporation
- Applicants: Ntn Corporation
- Inventors: Masashi Kitai; Kohei Higashi; Hidekazu Hirano; Hajime Isa; Masanori Nishira; Hitoshi Shiotani; Keiji Iwamoto; Youhei Migaki
- Web page: https://patentgrep.com/patent/US10479917B2

## CPC

- C09K 5/10: Liquid materials
- B24C 1/08: for polishing surfaces, e.g. {smoothing a surface} by making use of liquid-borne abrasives
- C10M 105/24: having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
- C10M 129/08: containing at least 2 hydroxy groups
- C10M 129/16: Ethers
- C10M 133/08: containing hydroxy groups
- C10M 173/02: not containing mineral or fatty oils
- C10M 2207/022: containing at least two hydroxy groups
- C10M 2207/046: Hydroxy ethers
- C10M 2207/126: monocarboxylic
- C10M 2209/104: of alkylene oxides containing two carbon atoms only
- C10M 2209/108: etherified
- C10M 2215/04: having amino groups bound to acyclic or cycloaliphatic carbon atoms
- C10M 2215/042: containing hydroxy groups; Alkoxylated derivatives thereof
- C10M 2219/024: of esters, e.g. fats
- C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
- C10N 2030/12: Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
- C10N 2040/22: with essential removal of material {, e.g. cutting, grinding or drilling}
- C10N 2040/246: {Iron or steel}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- B24C: ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

The present invention addresses the problem of providing a water-soluble cutting or grinding fluid that has excellent permeability and washability, that can be widely used in cutting or grinding, and that is particularly suitable for use in superfinishing. The present invention provides a water-soluble cutting or grinding fluid that contains a glycol compound (A), at least one substance (B) selected from the group consisting of organic amines and inorganic alkalis, a surfactant (C), and water (D), the water-soluble cutting or grinding fluid having a contact angle of 2 to 15° as measured using the θ/2 method one second after a drop of a dilution of the water-soluble cutting or grinding fluid is dropped on an SPCC-SB plate.

## Claims

### Claim 1

A water-soluble cutting or grinding fluid comprising
glycol compounds (A) comprising propylene glycol and diethylene glycol mono-2-ethylhexyl ether,
at least one substance (B) selected from the group consisting of triisopropanolamine, monoisopropanolamine, and mono-sec-butanolamine,
a surfactant (C), and
water (D),
the water-soluble cutting or grinding fluid having a contact angle of 2 to 15° as measured using the θ/2 method one second after a drop of a dilution of the water-soluble cutting or grinding fluid is dropped on an SPCC-SB plate.

### Claim 2 (depends on 1)

The water-soluble cutting or grinding fluid according to claim 1, wherein the surfactant (C) comprises a nonionic surfactant.

### Claim 3 (depends on 2)

The water-soluble cutting or grinding fluid according to claim 2, wherein the nonionic surfactant comprises polyoxyethylene alkyl ether.

### Claim 4 (depends on 1)

The water-soluble cutting or grinding fluid according to claim 1, wherein
the glycol compounds (A) are present in an amount of 5 to 80 wt. %,
the substance (B) is present in an amount of 1 to 30 wt. %,
the surfactant (C) is present in an amount of 5 to 30 wt. %, and
the water (D) is present in an amount of 5 to 80 wt. %.

### Claim 5 (depends on 1)

The water-soluble cutting or grinding fluid according to claim 1, wherein the contact angle is measured using the water-soluble cutting or grinding fluid diluted 1 to 30 times.

### Claim 6 (depends on 1)

The water-soluble cutting or grinding fluid according to claim 1, further comprising 1 to 20 wt. % of a fatty acid.

### Claim 7 (depends on 1)

The water-soluble cutting or grinding fluid according to claim 1, further comprising 1 to 20 wt. % of a sulfurized fatty acid.

### Claim 8 (depends on 1)

A superfinishing process comprising superfinishing a workpiece while rotating the workpiece and pressing a grindstone against the workpiece with the grindstone being oscillated in a direction perpendicular to a tangential direction of the workpiece rotation, the superfinishing being performed using the water-soluble cutting or grinding fluid according to claim 1 between the workpiece and the grindstone.

### Claim 9 (depends on 1)

A superfinishing device comprising:
a superfinishing machine for superfinishing a workpiece while rotating the workpiece and pressing a grindstone against the workpiece with the grindstone being oscillated in a direction perpendicular to a tangential direction of the workpiece rotation, and
a blast nozzle for supplying the water-soluble cutting or grinding fluid according to claim 1 between the workpiece and grindstone.

### Claim 10 (depends on 9)

The superfinishing device according to claim 9, further comprising an in-process gauge for detecting a decrease in workpiece size resulting from processing with the grindstone.

### Claim 11 (depends on 8)

A composite processing method comprising performing either a cutting or grinding process and the superfinishing process according to claim 8 in one processing unit.

### Claim 12 (depends on 9)

A processing device comprising a cutting or grinding device and the superfinishing device according to claim 9 that are combined into one processing unit.

### Claim 13

A water-soluble cutting or grinding fluid comprising
(i) propylene glycol,
(ii) at least one substance selected from the group consisting of triisopropanolamine, monoisopropanolamine, and mono-sec-butanolamine,
(iii) a surfactant, and
(iv) water, the water-soluble cutting or grinding fluid having a contact angle of 2 to 15° as measured using the θ/2 method one second after a drop of a dilution of the water-soluble cutting or grinding fluid is dropped on an SPCC-SB plate.

### Claim 14 (depends on 1)

The water-soluble cutting or grinding fluid according to claim 1, wherein the substance (B) is present in an amount of 5 to 30 wt. %.

### Claim 15 (depends on 13)

The water-soluble cutting or grinding fluid according to claim 13, wherein the substance (B) present in an amount of 5 to 30 wt. %.

### Claim 16 (depends on 1)

The water-soluble cutting or grinding fluid according to claim 1, wherein the at least one substance (B) is triisopropanolamine.

### Claim 17 (depends on 1)

The water-soluble cutting or grinding fluid according to claim 1, wherein the at least one substance (B) is monoisopropanolamine.

### Claim 18 (depends on 1)

The water-soluble cutting or grinding fluid according to claim 1, wherein the at least one substance (B) is mono-sec-butanolamine.

### Claim 19 (depends on 13)

The water-soluble cutting or grinding fluid according to claim 13, wherein the at least one substance (B) is triisopropanolamine.

### Claim 20 (depends on 13)

The water-soluble cutting or grinding fluid according to claim 13, wherein the at least one substance (B) is monoisopropanolamine.