JP2000256688A - Metal working fluid composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a metal working fluid composition which is excellent in low-temperature lubricity, low-temperature stability, and low-temperature fluidity, is hardly skin-irritating, and is suitable for cold air working by incorporating a glycerin ester of a linear fatty acid and a glycerin ester of a branched fatty acid, each in a specified amount, into the same. SOLUTION: This composition contains 10-50 pts.wt. glycerin ester, preferably a triester, of a linear fatty acid preferably having 6-22 carbon atoms and/or being a saturated fatty acid and/or having an average mol.wt. of 470-560 and 50-90 pts.wt. glycerin ester, preferably a triester, of a branched fatty acid preferably having 6-18 carbon atoms and/or having an average mol.wt. of 450-560. The composition can be used as a water-insoluble cutting and grinding fluid. If necessary, the composition may further contain a rust preventive (e.g. a fatty acid, a sulfonate or a carboxamide), an antifoaming agent, an antioxidant, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metalworking oil composition which can be widely applied to metalworking such as cutting, grinding, rolling, press working, plastic working, etc., and particularly to cold air processing and semi-dry cutting. It relates to a suitable metalworking oil composition.

[0002]

2. Description of the Related Art As an environmentally friendly metal processing method,
In recent years, research on dry processing such as cutting and grinding has been advanced. When metal processing is performed dry, it is necessary to cool the processing point. For example, the processing point is cooled by injecting compressed cooling air or the like. However, in the complete dry machining, since a lubrication between the tool and the work material is insufficient, a very small amount of lubricating oil is supplied. Conventionally known metalworking oil compositions have insufficient fluidity and lubricity at low temperatures and cannot be directly applied to cold air processing. Further, there is a problem that the stability at low temperatures (liquid retention) is not sufficient, and that the skin is highly irritating.

[0003]

Accordingly, an object of the present invention is to provide a metalworking oil composition which is excellent in low-temperature lubricity, low-temperature stability, and low-temperature fluidity and is suitable for cold air processing.
Another object of the present invention is to provide an environment-friendly metalworking oil composition that has low skin irritation and does not cause problems such as roughening of the skin when it adheres to the skin. Still another object of the present invention is to provide a water-insoluble cutting / grinding oil having excellent low-temperature lubricity, low-temperature stability, low-temperature fluidity and low skin irritation.

[0004]

The present invention provides a metalworking oil comprising (A) 10 to 50 parts by weight of an ester of a linear fatty acid and glycerin, and (B) 50 to 90 parts by weight of an ester of a branched fatty acid and glycerin. A composition.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The straight-chain fatty acid used as a raw material of the ester of the component (A) used in the present invention is preferably a C6 to C22, more preferably a C6 to C18, more preferably a C6 to C12, and most preferably a C8 to C10. Fatty acids. This linear fatty acid may be saturated or unsaturated, but a saturated fatty acid is preferred. The linear fatty acid preferably has an average molecular weight of 470 to 560. Specific examples of such linear fatty acids include capric acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, undecylenic acid, dodecanoic acid, tridecanoic acid, pentadecanoic acid, heptadecanoic acid, nonadecanoic acid, and lauric acid , Myristic acid, palmitic acid, stearic acid, arachiic acid, behenic acid, elaidic acid, oleic acid, linoleic acid, linoleic acid, and the like.
Particularly preferred are capric, heptanoic, octanoic, nonanoic, decanoic, undecanoic and dodecanoic acids. The glycerin ester of a linear fatty acid may be any of a monoester, a diester, and a triester,
Triesters, ie, triglycerides, are most preferred.

[0006] The branched fatty acid used as a raw material for the ester of component (B) used in the present invention preferably has 6 to 1 carbon atoms.
8, more preferably 6 to 13, more preferably 6 to
9, most preferably 8 or 9 fatty acids. This branched fatty acid may be saturated or unsaturated. The branched fatty acid preferably has an average molecular weight of 450 to 560. Specific examples of such a branched fatty acid include isoheptanoic acid, 2-ethylhexanoic acid, isooctanoic acid, isononanoic acid, isodecanoic acid, isostearic acid, and the like. Particularly preferred are 2-ethylhexanoic acid, isooctanoic acid,
Isononanoic acid. The glycerin ester of the branched fatty acid may be any of a monoester, a diester and a triester, but a triester, that is, a triglyceride is most preferred.

It is necessary that the weight ratio of (A) the ester of linear fatty acid and glycerin to (B) the ester of branched fatty acid and glycerin is 10 to 50:50 to 90. From this range, it is difficult to sufficiently achieve the object of the present invention even if the amount of component (A) is large or small.

The metalworking oil composition of the present invention may be composed of only the component (A) and the component (B). However, general-purpose components of the metalworking oil composition, for example, dodecylsuccinic acid, stearylsuccinic acid And fatty acids such as isostearyl succinic acid, sulfonates such as sodium petroleum sulfonate, barium sulfonate and calcium sulfonate, and carboxylic acid amides may be contained as rust preventives. The appropriate amount of these additives is 0.5 to 10% by weight based on the total weight of the oil agent. Further, if necessary, a silicone-based antifoaming agent, a polymer-based antifoaming agent, an alcohol-based antifoaming agent, a benzothiazole-based metal anticorrosive, an antioxidant represented by BHT and PAN, and the like may be contained. The amount of these additives is based on the total weight of the oil agent.
5% by weight or less is appropriate.

Further, in order to further improve the machinability and grindability, synthetic oils such as poly-α-olefins, chlorinated paraffins, sulfurized oils and fats, alkyl polysulfides, zinc dithiophosphate, molybdenum dithiophosphate, molybdenum dithiocarbamate and the like are contained. Is also good. The appropriate amount of these additives is 10% by weight or less based on the total weight of the oil agent. It is preferable not to contain extreme pressure additives such as chlorine compounds and phosphorus compounds. The metalworking oil composition of the present invention comprises a component
It can be easily produced by blending (A), component (B), and other optional components in predetermined amounts.

[0010]

Examples and Comparative Examples Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. Table 1 shows the contents of triglycerides and other components used in Examples and Comparative Examples. A metalworking oil composition (water-insoluble cutting and grinding oil) having the composition shown in Table 2 was prepared. The following performance evaluations were performed on these compositions.

Friction Coefficient A friction coefficient is calculated from the pin-ball pendulum damping rate at −30 ° C. using a Soda-type pendulum type oil friction tester. Pass 0.12 or less. Low-temperature stability A liquid that was liquid at −30 ° C. was judged as acceptable (○), and the kinematic viscosity of the liquid was measured by the method of JIS K 2283.

A test was carried out using a skin irritant patch [Finn Chamber: sold by Taisho Pharmaceutical Co., Ltd.]. Approximately 0.025 ml of the sample is infiltrated into the filter paper, affixed to the skin of the forearm, removed after 24 hours, and observed 4 hours after removal. The judgment results of 10 subjects are summed up, and the average value is obtained. Pass 4.0 or less. Criteria 3: redness with blisters and papules. 2: Red and swollen. 1: A little reddish. 0.5: Suspicious. 0: No response

[0013]

[Table 1]

[0014]

[Table 2]

From the results of Examples and Comparative Examples in Table 2, the metal working oil compositions of Examples 1 to 7 of the present invention have a low coefficient of friction and excellent lubricity, and are liquid even at a low temperature of -30 ° C. It shows that it shows excellent low-temperature stability (flowability) and low skin irritation. On the other hand, Comparative Example 1 in which the amount of the component (A) was more than 50 parts by weight, Comparative Example 2 in which the component (B) was not included, Comparative Example 3 in which the component (A) was not included, and a comparison of the rapeseed white oil Each of the compositions of Example 5 and Comparative Example 8 of mineral oil is solid at -30 ° C and has no low-temperature stability (flowability). Also (A)
The composition of Comparative Example 4 containing no component has a high coefficient of friction and poor lubricity. The compositions of Comparative Examples 6 and 7 using diester oil have high skin irritation.

[0016]

The metalworking oil composition of the present invention has excellent low-temperature lubricity, low-temperature stability, and low-temperature fluidity, and is widely used in metal processing such as cutting, grinding, rolling, pressing, and plastic working. It can be applied and is particularly suitable for cold air processing. In addition, the composition has low skin irritation and is environmentally friendly.

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Claims (13)

[Claims] (A) Ester 1 of a linear fatty acid and glycerin
0 to 50 parts by weight and (B) ester of branched fatty acid and glycerin
A metalworking oil composition containing 50 to 90 parts by weight. 2. The metalworking oil composition according to claim 1, wherein the straight-chain fatty acid is a fatty acid having 6 to 22 carbon atoms. 3. The metalworking oil composition according to claim 1, wherein the straight-chain fatty acid is a fatty acid having 6 to 18 carbon atoms. 4. The metalworking oil composition according to claim 1, wherein the straight-chain fatty acid is a fatty acid having 6 to 12 carbon atoms. 5. The metalworking oil composition according to claim 1, wherein the straight-chain fatty acid is a fatty acid having 8 to 10 carbon atoms. 6. The linear fatty acid is a saturated fatty acid.
The metalworking oil composition according to any one of claims 5 to 5. 7. The linear fatty acid has an average molecular weight of 470 to 56.
The metalworking oil composition according to any one of claims 1 to 6, which is a fatty acid of 0. 8. The metalworking oil composition according to claim 1, wherein the branched fatty acid is a fatty acid having 6 to 18 carbon atoms. 9. The metalworking oil composition according to claim 1, wherein the branched fatty acid is a fatty acid having 6 to 13 carbon atoms. 10. The metalworking oil composition according to claim 1, wherein the branched fatty acid is a fatty acid having 6 to 9 carbon atoms. 11. The metalworking oil composition according to claim 1, wherein the branched fatty acid is a fatty acid having 8 or 9 carbon atoms. 12. The branched fatty acid has an average molecular weight of 450-5.
The metalworking oil composition according to any one of claims 1 to 11, which is a fatty acid of 60. 13. A water-insoluble cutting and grinding oil.
13. The metalworking oil composition according to any one of claims 12 to 12.