JP2014012790A - Metalworking oil composition, and metalworking method and metal workpiece using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metalworking oil composition having excellent putrefaction resistance, low skin irritation, excellent defoaming property, stability and lubricity (machinability, grindability).SOLUTION: A metalworking oil composition contains (A) at least one kinds of a primary, secondary, or tertiary alkanolamine, (b) at least one kinds of branched saturated fatty acid having 8 to 40 carbone atoms, (C) a saturated or unsaturated linear fatty acid having 8 to 30 carbone atoms. The alkanolamine of component (A) contains at least one kinds selected from a group consisting of (A-1) amino butanol, amino pentanol, amino hexanol, amino octanol and amino dodecanol and percentage of (A-1) is 5 to 35 mass% on the basis of the total mass of the amine included in the composition.

Description

  The present invention relates to a water-soluble metalworking fluid composition that can be widely applied to metalworking such as plastic grinding as well as cutting grinding, and a metalworking method using the same, and in particular, a water-soluble metalworking fluid excellent in anti-corrosion performance. The present invention relates to a composition and a metal processing method using the composition.

The cutting fluid widely used in the cutting and grinding fields contains water-insoluble cutting fluid based on mineral oil, mineral oil, surfactant, organic amine, etc. There is an oil agent.
And in a water-soluble cutting fluid agent, in order to improve the anti-corrosion performance of an oil agent, the compound called an antiseptic | preservative is added or the preservative amine is prescribed.
However, in recent years, cutting oils have also been required to develop more environmentally friendly oils and oils that can withstand long-term use as much as possible. ing.

  Conventionally, water-soluble metalworking oils include, for example, water-soluble metalworking oil compositions using mint oil (Patent Document 1), water-soluble metalworking oil compositions using cinnamon oil (Patent Document 2), aromatic amines or Water-soluble metalworking fluid using alicyclic amine (Patent Document 3), water-soluble grinding oil composition using benzol compound and paraoxybenzoate ester compound (Patent Document 4), antibacterial water-soluble cutting fluid using alkylenediamine (Patent Document 5), water-soluble cutting oil composition using fatty acid alkanolamide ethylene oxide adduct and alkylamine ethylene oxide adduct, alicyclic amine ethylene oxide adduct, fatty acid higher alcohol adduct (Patent Document 6), 1 Grade, secondary, tertiary alkylamine, aromatic diamineoxyalkylene adduct, alicyclic diamineoxy Water-soluble cutting / grinding fluid using a ruxene adduct (Patent Document 7), a primary alkanolamine, a carboxylic acid having 6 to 24 carbon atoms, and a specific alkylenediamine (Patent Document 8), biocide For example, a metal working fluid using amino alcohol (Patent Document 9) is known.

  However, although these water-soluble metalworking fluids are effective for general bacteria, sufficient effects cannot be obtained for straw and yeast. In addition, for compounds that are effective, halogen-containing compounds, polycyclic aromatic compounds, phenolic compounds or metal salts are used, and some compounds are subject to PRTR. Is concerned about the impact of

On the other hand, amines are refraining from use because N, N-dicyclohexylamine, which has been designated as a designated substance in the revision of the PRTR law that was implemented last year, is thought to have a negative effect on the human body.
However, antiseptics and amines are indispensable compounds for improving the antiseptic performance of oils.

Japanese Patent No. 2676056 Japanese Patent No. 2645675 Japanese Patent No. 2510233 Japanese Patent Publication No. 7-37632 Japanese Patent Publication No. 7-30348 Japanese Patent Publication No. 6-31388 Japanese Patent Laid-Open No. 9-316482 Japanese Patent Publication No. 6-76590 Special table 2011-523640 gazette

  An object of the present invention is to provide a metalworking fluid that is excellent in spoilage resistance, has low skin irritation, and has excellent antifoaming properties and lubricity (cutting properties and grindability).

According to the inventors, it has been found that the purpose can be achieved by using a specific amine and a specific fatty acid in a specific ratio. That is, according to the present invention, the following metalworking fluid, a metalworking method using the same, and a machined part are provided:
1. (A) at least one primary, secondary or tertiary alkanolamine;
(B) at least one branched saturated fatty acid having 8 to 40 carbon atoms;
(C) containing at least one kind of saturated or unsaturated linear fatty acid having 8 to 30 carbon atoms,
The alkanolamine of component (A) contains (A-1) at least one selected from the group consisting of aminobutanol, aminopentanol, aminohexanol, aminooctanol and aminododecanol, and (A-1) Is a metalworking fluid composition characterized by being 5 to 35% by mass based on the total mass of the amine contained in the composition.
2. 2. The metalworking fluid composition according to item 1, wherein the component (A-1) is one or two selected from the group consisting of aminobutanol, aminohexanol, aminooctanol and aminododecanol.
3. 3. The metalworking fluid composition according to 1 or 2, wherein the component (B) is at least one selected from the group consisting of isononanoic acid, neononanoic acid, isodecanoic acid, neodecanoic acid, isotridecanoic acid, neotridecanoic acid and isostearic acid.
4). Component (C) is nonanoic acid, decanoic acid, undecanoic acid, undecylenic acid, lauric acid, myristic acid, palmitic acid, stearic acid, octadecenoic acid, linoleic acid, linolenic acid, 12-hydroxystearic acid, ricinoleic acid and erucic acid 4. The metalworking fluid composition according to any one of 1 to 3, which is at least one selected from the group consisting of:
5. 5. The metalworking oil composition according to any one of 1 to 4 diluted with water to a concentration of 0.5% by mass or more.
6). The metal processing method including using the metal processing oil agent composition of any one of said 1-5.
7). The manufacturing method of a metal material processed article including the process of processing a metal material using the metalworking oil agent composition of any one of said 1-5.
8). 8. A metal material processed product obtained by the manufacturing method according to the above item 7.

  ADVANTAGE OF THE INVENTION According to this invention, the metalworking fluid agent which is excellent in rot resistance, has low skin irritation, and was excellent in defoaming property and lubricity (cutting property, grindability) can be provided.

[Component (A)]
Component (A) is at least one primary, secondary or tertiary alkanolamine, and (A-1) is selected from the group consisting of aminobutanol, aminopentanol, aminohexanol, aminooctanol and aminododecanol. It contains at least one selected, and the ratio of (A-1) is 5 to 35% by mass based on the total amount of amine. The component (A) contributes to rot resistance.
The alkyl part constituting the alkanolamine may be linear or branched, and the carbon number thereof is preferably 4-12.

Examples of the primary alkanolamine include aminobutanol, aminohexanol, aminooctanol, aminododecanol, 2- (2-aminoethoxy) ethanol, monoisopropanolamine and the like. Of these, aminobutanol, aminooctanol, aminododecanol, and 2- (2-aminoethoxy) ethanol are preferred.
Examples of secondary alkanolamines include diisopropanolamine, 2- (butylamino) ethanol, diethanolamine, methylethanolamine, and ethylethanolamine. Of these, diisopropanolamine and 2- (butylamino) ethanol are preferred.
Examples of the tertiary alkanolamine include N-methyldiethanolamine, triethanolamine, triisopropanolamine, butyldiethanolamine, dibutylethanolamine, dimethylethanolamine, diethylethanolamine, dimethylisopropanolamine, diethylisopropanolamine and the like. Of these, N-methyldiethanolamine is preferred.

(A-1) is preferably one or two selected from the group consisting of aminobutanol, aminohexanol, aminooctanol and aminododecanol. A-1 is preferably aminooctanol alone or a mixture of aminooctanol and aminobutanol, aminohexanol or aminododecanol.
The content of component (A-1) is preferably 5 to 35% by mass, more preferably 15 to 30% by mass, based on the total mass of the amine contained in the metalworking fluid of the present invention. . If it is less than 5% by mass, sufficient rot resistance may not be obtained. If it exceeds 35%, the skin irritation becomes strong, which is not preferable.
The content of component (A) is preferably 5 to 35% by mass, more preferably 10 to 25% by mass, based on the total mass of the metalworking fluid of the present invention. If it is included in such a range, it is preferable because sufficient anticorrosion resistance is maintained and the skin irritation is weak.

[Component (B)]
The branched saturated fatty acid having 8 to 30 carbon atoms of the component (B) imparts antifoaming properties. Dicarboxylic acid may be used. The fatty acid residue part may have a hydroxyl group.
More preferably, the component (B) is a branched saturated fatty acid having 10 to 18 carbon atoms. It is preferably at least one selected from the group consisting of isononanoic acid, neononanoic acid, isodecanoic acid, neodecanoic acid, isotridecanoic acid, neotridecanoic acid and isostearic acid.
More preferably, component (B) is neodecanoic acid, isostearic acid or a mixture thereof. Most preferred is isostearic acid alone or a mixture of neodecanoic acid and isostearic acid.
The content of component (B) is preferably 0.3 to 5% by mass, more preferably 0.5 to 3% by mass, based on the total mass of the metalworking fluid of the present invention. When included in such a range, the antifoaming property is expected and excellent.

[Component (C)]
The saturated or unsaturated linear fatty acid having 8 to 30 carbon atoms as the component (C) contributes to emulsification of the cutting fluid agent while imparting desired lubricity (cutting property). Dicarboxylic acid may be used. The fatty acid residue part may have a hydroxyl group.
Component (C) is nonanoic acid, decanoic acid, undecanoic acid, undecylene acid, dodecanoic acid, dodecanedioic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, octadecenoic acid, linoleic acid, linolenic acid, 12-hydroxystearic acid, ricinolein It is preferably at least one selected from the group consisting of acids and erucic acids.
More preferably, the component (C) is at least one selected from the group consisting of nonanoic acid, octadecenoic acid and dodecanedioic acid. A mixture of these two or three types is more preferable. Most preferred are a mixture of nonanoic acid and dodecanedioic acid and a mixture of nonanoic acid, octadecenoic acid and dodecanedioic acid.
The content of component (C) is preferably 5 to 30% by mass, more preferably 5 to 15% by mass, based on the total mass of the metalworking fluid of the present invention. When included in such a range, the lubricity is excellent.

  The metalworking fluid composition of the present invention contains a rust inhibitor such as linoleic acid methacrylic acid condensate, if necessary. The content is preferably 0.5 to 5% by mass, more preferably 1 to 3% by mass, based on the total mass of the metalworking fluid of the present invention. When it is contained in such a range, the rust prevention property is excellent.

  The metalworking fluid composition of the present invention contains castor fatty acid polycondensate as necessary. A 2-6 mer is particularly preferable. The acid value (measured according to JIS K 2501) is preferably 30 to 100. The dimer mainly functions as an emulsifier, and the tetramer and hexamer mainly function as a stock solution stabilizer. The content is preferably 3 to 25% by mass, more preferably 5 to 20% by mass, based on the total mass of the metalworking fluid of the present invention. When included in such a range, the emulsification of the diluted solution and the stability of the stock solution are excellent.

The metalworking fluid composition of the present invention contains a base oil as necessary. Examples of the base oil include mineral oil, ester oil, polyol ester, alkylbenzene, fats and oils, polyglycol, poly-α-olefin, α-olefin, normal paraffin, isoparaffin, polyether and the like. These are not limited to single items, and may be a plurality of types of blended oils. Mineral oil, ester oil, polyglycol, and alkylbenzene are preferable. As the ester oil, 2-ethylhexyl palmitate is preferable. As the alkylbenzene, an alkylbenzene having a linear or branched alkyl group having 10 to 20 carbon atoms is preferable.
The kinematic viscosity at 40 ° C. of the base oil is preferably 4 to 70 mm ² / s from the viewpoint of lubricity.
The content of the base oil is preferably 10 to 50% by mass and more preferably 15 to 40% by mass based on the total mass of the metalworking fluid of the present invention. When included in such a range, the lubricity is excellent.

The metalworking fluid composition of the present invention contains a surfactant as necessary. As the surfactant, for example, any of an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant may be used. Nonionic surfactants are preferred. As the nonionic surfactant, those having an HLB of 4 to 14 represented by the Griffin formula are preferable. For example, polyoxyalkylene alkyl (alkenyl) ethers such as polyoxypropylene monobutyl ether and polyoxyethylene oleyl ether (weight average molecular weight of about 700 to 2000); alkylene oxides of higher amines such as laurylamine EO adduct and cocoamine EO adduct Adducts; alkylene oxide adducts of higher alcohols such as C12-14 alcohol EO, PO adducts; higher alcohols such as tridecyl alcohol. Surfactants may be used alone or in combination of two or more.
The content of the surfactant is preferably 0.5 to 10% by mass and more preferably 1 to 7% by mass based on the total mass of the metalworking fluid of the present invention. When contained in such a range, the emulsification of the diluted solution and the stability of the stock solution are excellent.

If necessary, the metalworking fluid composition of the present invention may use fatty acids such as lauryl succinic acid and stearyl succinic acid, sulfonates such as sodium petroleum sulfonate, carboxylic acid amides, and the like as rust inhibitors.
The content of the rust inhibitor is preferably 0 to 20% by mass and more preferably 1 to 10% by mass based on the total mass of the metalworking fluid of the present invention.

Moreover, the metal processing oil agent composition of this invention may use a silicone type antifoamer, an alcohol type antifoamer, a benzotriazole type metal anticorrosive agent, etc. as needed.
The content of the antifoaming agent and the metal anticorrosive is preferably 0.05 to 2% by mass, and preferably 0.1 to 1% by mass, based on the total mass of the metalworking fluid of the present invention. More preferred.

Furthermore, the metalworking fluid composition of the present invention may contain a benzoisothiazoline and / or a derivative thereof (for example, 1,2-benzisothiazolin-3-one), sodium omadin, a metal pyrithione salt, etc. Alkylamines typified by amines and oleylamines may be used as preservatives or fungus inhibitors.
The content of the preservative or the fungus inhibitor is preferably 0.3 to 5% by mass, more preferably 0.5 to 2% by mass, based on the total mass of the metalworking fluid of the present invention. .

The pH (25 ° C.) of the metalworking fluid of the present invention is preferably 7.0 to 11, more preferably 8.0 to 11 in a solution obtained by diluting the stock solution with pure water to 5% by mass. When the pH is less than 7.0, the antiseptic property may be lowered, and when the pH exceeds 11, the skin irritation may be increased, which is not preferable. As the pH adjuster, an amine other than the component (A), for example, an amine having an alicyclic group such as dicyclohexylamine, an EO adduct thereof, an amine having an aromatic cyclic group such as metaxylenediamine, or the like is used. Can do.
The metalworking fluid composition of the present invention is generally used after diluting with water to a concentration of 0.5% by mass or more.

Compositions of Examples and Comparative Examples having the compositions shown in Table 1 were prepared.
<Evaluation method>
(1) Corrosion resistance:
Add 3% by weight of the following spoilage solution to 100ml of the composition of Example or Comparative Example diluted to 3% by weight, and measure the number of viable cells (cells / ml) after 30 days of shaking culture at 30 ° C and 150rpm. did.
Septic liquid: 50% by mass of the emulsion-type cutting fluid that has deteriorated
Tryptic soy medium 25% by mass
Glucose peptone medium 25% by mass
The above was aerated for 24 hours and was activated, and the number or contamination of general bacteria, sputum, yeast and anaerobic bacteria was evaluated with a sun eye bio checker (manufactured by Sanai Oil Co., Ltd.). For general bacteria and yeast, the number of bacteria in 1 ml was evaluated in 8 levels: no, 10 ³ or less, 10 ³ , 10 ⁴ , 10 ⁵ , 10 ⁶ , 10 ⁷ , 10 ⁷ or more . For sputum and anaerobic bacteria, the degree of contamination was evaluated in four levels: no, mild, moderate and severe.
The pass / fail judgment was “no” for sputum, yeast and anaerobic bacteria, and “10 ³ or less / 1 ml” for general bacteria.

(2) Skin irritation:
One drop of a solution obtained by diluting the composition of Example or Comparative Example to 50% by weight (2 times) is dropped on a patch test unit (fin chamber manufactured by epitest) and attached to the upper arm with tape, and 24 hours later. Observe skin condition. Evaluation is based on the results of subjects (10 boys) in total. The lower the score, the less irritation to the skin and the less the skin roughness. There are 5 border lines.

Criteria 3 points: Redness with blisters and papules 2 points: Redness and swelling 1 point: Slight redness 0.5 point: Suspicious 0 point: No response

(3) 3L circulation type foaming test:
Evaluated by 3L gear pump circulation test method.
Liquid volume: 3L
Flow rate: 17.4L / min
Discharge pressure: 0.6kgf / cm ²
Nozzle diameter: φ6.5mm
Container: diameter 220mm, height 300mm
Diluted water: Adjusted water of Ca5ppm (calcium chloride dihydrate 0.0018375g diluted with distilled water to make 1L)
Concentration: Dilute the stock solution to 5mass% with adjusted water of 5ppm Ca. Liquid temperature: 25 ℃
Judgment criteria: The maximum bubble height is 200 mm or less.

(4) Lubricity (tapping torque):
Using the following work material, tapping of φ6 was performed under the following conditions, and the cutting resistance received during the processing was measured.
Machining tool: Roll tap (OSG B-NRT RH7 M6 × 1.0)
Work material: Aluminum alloy (AC8B-T6, 300 x 200 x 30 mm)
Cutting speed: 10m / min
Pilot hole: 5.48mm reamer finish, blind hole Cutting length: 20mm
Concentration: Dilute stock solution to 5mass% with water N number: 5
Test oil: Diluent of metal working oil of Example or Comparative Example diluted to 5 mass% with water Lubricating amount: Test oil 6 liters / minute Evaluation method: Cutting resistance (torque [N · m]) measurement criteria : Cutting torque is 3.50N · m or less.

Claims (8)

(A) at least one primary, secondary or tertiary alkanolamine;
(B) at least one branched saturated fatty acid having 8 to 40 carbon atoms;
(C) containing at least one kind of saturated or unsaturated linear fatty acid having 8 to 30 carbon atoms,
The alkanolamine of component (A) contains (A-1) at least one selected from the group consisting of aminobutanol, aminopentanol, aminohexanol, aminooctanol and aminododecanol, and (A-1) Is a metalworking fluid composition characterized by being 5 to 35% by mass based on the total mass of the amine contained in the composition.   The metalworking oil composition according to claim 1, wherein the component (A-1) is one or two selected from the group consisting of aminobutanol, aminohexanol, aminooctanol and aminododecanol.   The metalworking fluid composition according to claim 1 or 2, wherein the component (B) is at least one selected from the group consisting of isononanoic acid, neononanoic acid, isodecanoic acid, neodecanoic acid, isotridecanoic acid, neotridecanoic acid and isostearic acid.   Component (C) is nonanoic acid, decanoic acid, undecanoic acid, undecylenic acid, lauric acid, myristic acid, palmitic acid, stearic acid, octadecenoic acid, linoleic acid, linolenic acid, 12-hydroxystearic acid, ricinoleic acid and erucic acid The metalworking fluid composition according to any one of claims 1 to 3, which is at least one selected from the group consisting of:   The metalworking oil composition according to any one of claims 1 to 4, diluted with water to a concentration of 0.5% by mass or more.   The metal processing method including using the metal processing oil agent composition of any one of Claims 1-5.   The manufacturing method of a metal material processed article including the process of processing a metal material using the metalworking oil agent composition of any one of Claims 1-5.   A metal material processed product obtained by the manufacturing method according to claim 7.