JP2018168259A - Metal processing oil composition - Google Patents

Abstract

To provide a metal processing oil composition that has excellent processability and can prevent the corrosion (discoloration) of aluminum.SOLUTION: The metal processing oil composition for use in processing a workpiece comprising aluminum, comprises lubricant base oil, at least one selected from compounds represented by formula (1), and an alcohol. There is provided a metal processing oil with its lubricant base oil having a dynamic viscosity at 40°C of 10 mm/s or less. Preferably, the metal processing oil composition comprises lubricant base oil of an aromatic component content of 3 mass% or less. In formula (1), Rand Rare each independently H, an alkyl group or an aryl group, provided that Rand Rare not simultaneously H.SELECTED DRAWING: None

Description

  The present invention relates to a metalworking oil composition.

  Conventionally, in the field of metalworking, metalworking oil compositions (metalworking oils) have been used to lubricate the machined part of the workpiece. The higher the viscosity of the metal processing oil, the easier it is to form a thick oil film at the processing site, and good workability is exhibited.

  On the other hand, in metal processing, after processing, the metal working oil is removed from the processing site by a cleaning process or a thermal degreasing process. It tends to remain on the surface. That is, more cleaning agent is required in the cleaning process, and higher temperature heat is required in the thermal degreasing process, so that a high-viscosity metal working oil is not necessarily preferable in terms of cost and environment. In particular, when the workpiece is aluminum, a high pH cleaning agent having a strong cleaning power causes discoloration of aluminum, and thus such a cleaning agent cannot be used. In addition, since the melting point of aluminum is as low as 660 ° C., the thermal degreasing process cannot be performed at a high temperature.

  From the above viewpoint, when the work piece is aluminum, a low-viscosity metal working oil is used so that the metal working oil does not remain on the aluminum surface. In order to suppress, an extreme pressure agent may be added to low viscosity metalworking oil. Known extreme pressure agents include chlorine-based extreme pressure agents, sulfur-based extreme pressure agents, phosphorus-based extreme pressure agents and the like containing chlorine, sulfur, phosphorus and the like as constituent elements.

  Chlorine extreme pressure agents are rarely used in recent years because they generate dioxins when incinerated and discarded. Sulfur-based extreme pressure agents are sometimes shunned to generate a unique strong odor. On the other hand, phosphorus-based extreme pressure agents are inferior in processability compared to chlorine-based extreme pressure agents and sulfur-based extreme pressure agents, but are superior in terms of environmental burden and odor. A metalworking oil that uses bismuth has been studied (for example, Patent Document 1).

JP 2008-13682 A

  However, phosphorus-based extreme pressure agents may corrode (discolor) aluminum, which may significantly reduce the commercial value of the workpiece. Therefore, when using a phosphorus-based extreme pressure agent in a metal working oil used for processing aluminum, it is difficult to achieve both excellent workability and suppression of corrosion (discoloration).

  Therefore, an object of the present invention is to provide a metal working oil composition capable of suppressing corrosion (discoloration) of aluminum while having excellent workability.

［式（１）及び式（２）中、Ｒ^１〜Ｒ^３はそれぞれ独立にアルキル基又はアリール基を表す。］ The present invention comprises a lubricating base oil, at least one selected from the group consisting of a compound represented by the following formula (1) and a compound represented by formula (2), and an alcohol, Provided is a metalworking oil composition used for processing a workpiece.

[In Formula (1) and Formula (2), R ^{1 to} R ³ each independently represents an alkyl group or an aryl group. ]

The kinematic viscosity of the lubricating base oil at 40 ° C. is preferably 10 mm ² / s or less.

  The aromatic content in the lubricating base oil is preferably 3% by mass or less.

  The alcohol content is preferably 0.1 to 12% by mass based on the total amount of the metalworking oil composition.

  The processing of the work piece containing aluminum is preferably rolling, stamping, drawing, ironing, cutting or grinding.

  According to the present invention, it is possible to provide a metalworking oil composition capable of suppressing corrosion (discoloration) of aluminum while having excellent workability.

  Hereinafter, embodiments of the present invention will be described.

［式（１）及び式（２）中、Ｒ^１〜Ｒ^３はそれぞれ独立にアルキル基又はアリール基を表す。］ The metalworking oil composition of the present embodiment is a lubricant base oil, at least one selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the formula (2) (hereinafter, “ A component ") and alcohol.

[In Formula (1) and Formula (2), R ^{1 to} R ³ each independently represents an alkyl group or an aryl group. ]

  The lubricating base oil may be any of mineral oil, synthetic oil, or a mixture of both. As mineral oil, for example, a lubricating oil fraction obtained by subjecting crude oil to atmospheric distillation and vacuum distillation is subjected to solvent removal, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing In addition, paraffinic mineral oil or naphthenic mineral oil refined by appropriately combining purification treatments such as white clay treatment can be mentioned.

  Specific examples of the synthetic oil include propylene oligomer, polybutene, polyisobutylene, 1-octene oligomer, 1-decene oligomer, ethylene and propylene co-oligomer, ethylene and 1-octene co-oligomer, ethylene and 1- Examples thereof include poly α-olefins such as co-oligomers with decene or hydrides thereof; isoparaffins; alkylbenzenes such as monoalkylbenzene, dialkylbenzene and polyalkylbenzene; alkylnaphthalenes such as monoalkylnaphthalene, dialkylnaphthalene and polyalkylnaphthalene. These can be used alone or in combination of two or more. The synthetic oil is preferably a poly-α olefin or isoparaffin, more preferably isoparaffin, from the viewpoint of enhancing the thermal degreasing property.

Kinematic viscosity at 40 ° C. of the lubricating base oils, in view of enhancing the thermal degreasing and cleaning properties, is preferably less 10 mm ² / s, more preferably not more than ^{8 mm} 2 / s, more preferably ^{6 mm} 2 / s or less. The kinematic viscosity at 40 ° C. of the lubricating base oil is preferably 0.5 mm ² / s or more, more preferably 1 mm ² / s or more, and further preferably 1.5 mm from the viewpoint of further improving the workability. ² / s or more. Kinematic viscosity at 40 ° C. of the lubricating base oil, from the viewpoint of further improving the aspects and workability increase thermal degreasing and cleaning properties, preferably ^{0.5~10mm 2 / s, 1~10mm 2 /} s, 1 ^{.5~10mm 2 /s,0.5~8mm 2 / s, 1~8mm} 2 /s,1.5~8mm 2 /s,0.5~6mm 2 / s, 1~6mm 2 / s, 1 5-6 mm ² / s. The kinematic viscosity in this specification means the kinematic viscosity measured based on JISK2283.

  When the lubricating base oil is a mineral oil, the aromatic content in the lubricating base oil should be as low as possible from the viewpoint of reducing the odor and improving the working environment, and is preferably 3% by mass or less. Yes, more preferably 2% by mass or less, still more preferably 1% by mass or less. The aromatic content in this specification means the aromatic content measured based on ASTM D2007-93.

The number of carbon atoms of R ^{1 to} R ^{3 in} the formula (1) and the formula (2) is preferably 1 or more, more preferably from the viewpoint of further improving workability and further suppressing corrosion (discoloration). 2 or more, more preferably 4 or more, particularly preferably 6 or more, preferably 24 or less, more preferably 20 or less, still more preferably 18 or less, and particularly preferably 16 It is as follows. The number of carbons of R ^{1 to} R ³ in formula (1) and formula (2) is preferably 1 to 24, 1 to 20, from the viewpoint of further improving workability and further suppressing corrosion (discoloration). 1-18, 1-16, 2-24, 2-20, 2-18, 2-16, 4-24, 4-20, 4-18, 4-16, 6-24, 6-20, 6- 18, 6-16. The alkyl group represented by R ^{1 to} R ³ and the alkyl group contained in the aryl group may be linear or branched, but are preferably linear from the viewpoint of further improving processability. .

  The content of the lubricating base oil may be 50% by mass or more, 60% by mass or more, or 70% by mass or more based on the total amount of the metalworking oil composition. The content of the lubricating base oil may be 99% by mass or less, 98% by mass or less, or 97% by mass or less based on the total amount of the metal processing oil composition.

  As the component A, from the viewpoint of further improving workability, a compound represented by the formula (2) is preferably used, and more preferably a compound represented by the formula (1) and a formula (2). Are used in combination. When the compound represented by the formula (1) and the compound represented by the formula (2) are used in combination, the molar ratio of the compound represented by the formula (2) to the total amount of the component A is a viewpoint that further improves the workability. Therefore, it is preferably 0.2 or more, more preferably 0.3 or more, further preferably 0.4 or more, preferably 0.8 or less, more preferably 0.7 or less. Yes, more preferably 0.6 or less.

  The content of the component A is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and still more preferably 0.1% by mass based on the total amount of the metal processing oil composition from the viewpoint of further improving workability. It is at least mass%. The content of the component A is preferably 3% by mass or less, more preferably 2% by mass or less, still more preferably 1% by mass or less, based on the total amount of the metal processing oil composition, from the viewpoint of further suppressing corrosion (discoloration). is there. The content of the component A is preferably 0.01 to 3% by mass, 0.01 to 2% by mass, 0.01 to 1% by mass from the viewpoint of further improving workability and further suppressing corrosion (discoloration). %, 0.05-3 mass%, 0.05-2 mass%, 0.05-1 mass%, 0.1-3 mass%, 0.1-2 mass%, 0.1-1 mass% is there.

  The alcohol may be, for example, an aliphatic alcohol or an ether group-containing alcohol. The aliphatic alcohol is preferably a monohydric alcohol or a dihydric alcohol, more preferably a monohydric alcohol, and even more preferably a monohydric acid from the viewpoint of further improving processability and further suppressing corrosion (discoloration). It is a mixture of alcohol and dihydric alcohol. When the alcohol is a mixture of a monohydric alcohol and a dihydric alcohol, the content of the dihydric alcohol is preferably 3% by mass or more and 10% by mass or less based on the total amount of alcohol.

  The carbon number of the alcohol is preferably 6 or more, more preferably 8 or more, still more preferably 10 or more, from the viewpoint of further improving processability and further suppressing corrosion (discoloration). Preferably it is 20 or less, More preferably, it is 18 or less, More preferably, it is 16 or less. The carbon number of the alcohol is preferably 6 to 20, 6 to 18, 6 to 16, 8 to 20, 8 to 18, 8 to 16 from the viewpoint of further improving the workability and further suppressing corrosion (discoloration). 10-20, 10-18, 10-16. The alcohol may be linear or branched, but from the viewpoint of further improving processability, the alcohol is preferably a mixture of linear and branched, more preferably linear. The alcohol may be saturated or unsaturated, but is preferably saturated from the viewpoint of further improving processability.

  Specific examples of the aliphatic alcohol include hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, oleyl alcohol (9 -Octadecen-1-ol), nonadecanol, icosanol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, undecanediol, dodecanediol, tridecanediol, tetradecanediol, pentadecanediol, hexadecanediol, heptadecanediol, It may be octadecanediol, nonadecanediol, icosanediol, or the like.

  Specifically, the ether group-containing alcohol may be ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, or the like.

  From the viewpoint of further suppressing corrosion (discoloration), the alcohol content is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, based on the total amount of the metal working oil composition, Preferably it is 1 mass% or more. The content of the alcohol is preferably 12% by mass or less, more preferably 10% by mass based on the total amount of the metalworking oil composition, from the viewpoint of improving the detergency and thermal degreasing and obtaining an effect commensurate with the addition amount. % Or less, and more preferably 8% by mass or less. The content of the alcohol is preferably based on the total amount of the metalworking oil composition from the viewpoint of further suppressing corrosion (discoloration), and from the viewpoint of improving the detergency and thermal degreasing and obtaining an effect commensurate with the amount added. 0.1 to 12% by mass, 0.1 to 10% by mass, 0.1 to 8% by mass, 0.5 to 12% by mass, 0.5 to 10% by mass, 0.5 to 8% by mass, 1 to They are 12 mass%, 1-10 mass%, and 1-8 mass%.

  In addition to the above components, the metalworking oil composition can further contain other additives. As other additives, for example, oily agents such as fatty acids or esters of these fatty acids (lauric acid, myristic acid, oleic acid, methyl laurate, butyl palmitate, butyl stearate, etc.), phenolic antioxidants, etc. Examples of the processability improver include antioxidants and α-olefins. Although the total content of other additives is not particularly limited, it may be 0.1 to 10% by mass based on the total amount of the metal processing oil composition.

  The metalworking oil composition preferably does not contain moisture from the viewpoint of further suppressing corrosion (discoloration). The water content in the metalworking oil composition is preferably 3% by mass or less, more preferably 2% by mass or less, and still more preferably 1% by mass or less.

The kinematic viscosity at 40 ° C. of the metalworking oil composition is preferably 10 mm ² / s or less, more preferably 8 mm ² / s or less, and still more preferably 6 mm ² from the viewpoint of enhancing the thermal degreasing property and the cleaning property. / S or less. The kinematic viscosity at 40 ° C. of the lubricating base oil is preferably 0.5 mm ² / s or more, more preferably 1 mm ² / s or more, and further preferably 1.5 mm from the viewpoint of further improving the workability. ² / s or more.

  The metalworking oil composition according to the present embodiment is used for processing a workpiece (aluminum or aluminum alloy) containing aluminum, and preferably for rolling, punching, drawing, drawing, ironing, cutting, or grinding of the workpiece. Used. The metalworking oil composition according to the present embodiment is more preferably used as a cold rolling oil or fin press oil for aluminum or aluminum alloy. In any processing, the metalworking oil composition may be used as a so-called non-aqueous system that does not intentionally contain water, or may be used in a state mixed with water. The state mixed with water may be a state emulsified with water or a state where it is forcibly mixed with water.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example at all.

  In Examples and Comparative Examples, metalworking oil compositions having the compositions shown in Tables 1 to 10 were prepared using the following components.

A1: A compound represented by the formula (1), wherein R ¹ and R ² are linear alkyl groups having 8 carbon atoms.
A2: A compound represented by the formula (1), wherein R ¹ and R ² are linear alkyl groups having 12 carbon atoms.
A3: A compound represented by the formula (2), wherein R ³ is a linear alkyl group having 6 carbon atoms.
A4: A compound represented by the formula (2), wherein R ³ is a linear alkyl group having 16 carbon atoms.
A5: A compound represented by the formula (2), wherein R ³ is a linear alkyl group having 12 carbon atoms.
A6: A compound represented by formula (2), wherein R ³ is a linear alkyl group having 4 carbon atoms.
A7: A compound represented by the formula (2), wherein R ³ is a linear alkyl group having 18 carbon atoms.
A8: A compound represented by the formula (2), wherein R ³ is a linear alkyl group having 2 carbon atoms.
A9: A compound represented by the formula (2), wherein R ³ is a linear alkyl group having 20 carbon atoms.
A10: A compound represented by the formula (2), wherein R ³ is a linear alkyl group having 22 carbon atoms.

B1: 1-dodecanol B2: 1-decanol B3: 1-hexadecanol B4: 1-octanol B5: 1-octadecanol B6: 1-hexanol B7: 1-icosanol B8: oleyl alcohol (9-octadecene-1- All)
B9: 10-Methyl-1-undecanol B10: Tripropylene glycol

C1: mineral oil (40 ° C. kinematic viscosity 2.4 mm ² / s, aromatic content 0 mass%)
C2: Mineral oil (kinematic viscosity at 40 ° C. 1.5 mm ² / s, aromatic content 0% by mass)
C3: Mineral oil (40 ° C. kinematic viscosity 6 mm ² / s, aromatic content 0 mass%)
C4: Mineral oil (40 ° C. kinematic viscosity 1.1 mm ² / s, aromatic content 0% by mass)
C5: Mineral oil (40 ° C. kinematic viscosity 7.8 mm ² / s, aromatic content 0.1% by mass)
C6: mineral oil (40 ° C. kinematic viscosity 0.6 mm ² / s, aromatic content 0% by mass)
C7: Mineral oil (40 ° C. kinematic viscosity 9.7 mm ² / s, aromatic content 0.2% by mass)
C8: Mineral oil (40 ° C. kinematic viscosity 11.4 mm ² / s, aromatic content 0.3 mass%)
C9: Mineral oil (40 ° C. kinematic viscosity 2.8 mm ² / s, aromatic content 1.4% by mass)
C10: Mineral oil (40 ° C. kinematic viscosity 3.1 mm ² / s, aromatic content 2.4 mass%)
C11: Mineral oil (40 ° C. kinematic viscosity 2.6 mm ² / s, aromatic content 3.3 mass%)
C12: poly α-olefin (40 ° C. kinematic viscosity 4.5 mm ² / s, aromatic content 0% by mass)
C13: Isoparaffin (40 ° C. kinematic viscosity 2.8 mm ² / s, aromatic content 0% by mass)

D1: butyl stearate D2: oleic acid D3: tricresyl phosphate

  About each metalworking oil composition of an Example and a comparative example, workability and corrosivity were evaluated based on the following tests.

[Machinability]
JIS A1050 material coiled aluminum (thickness 0.5 mm, width 65 mm, length about 300 m) was cold-rolled using a work roll having a diameter of 51 mm. The rolling reduction was increased by 2%, and the maximum rolling reduction (%) that could be normally rolled without surface damage such as seizure or herringbone was determined.

[Corrosive]
An aluminum piece (thickness 0.5 mm, width 15 mm, length 100 mm) of JIS A1050 material was degreased with a solvent. The lower half of this aluminum piece was immersed in each metalworking oil composition in a beaker, and the upper part of the beaker was sealed with a wrap. In this state, it was allowed to stand in an environment of a temperature of 25 ° C. and a relative humidity of 50%, and the presence or absence of discoloration of the aluminum surface was observed every day. S with no discoloration, especially beautiful, A with no discoloration, B with very slight discoloration, C showing slight discoloration but acceptable range, and exceeding acceptable range D.

  About each metalworking oil composition of an Example and a comparative example, it evaluated based on the following tests also about thermal degreasing and an odor. The evaluation results are shown in Tables 11 to 19.

[Heat degreasing]
Two pieces of JIS A1050 aluminum pieces (thickness 0.5 mm, width 65 mm, length 65 mm) were degreased with a solvent, and 0.2 mL of oil was sandwiched between them. In the state which left this horizontally in oven, 100g of weight was put in the center. The temperature was raised from room temperature to 350 ° C. over 1 hour, and further maintained for 1 hour. Thereafter, it was naturally cooled, and when it returned to room temperature, the state of the surface sandwiching the oil was observed. A with no discoloration, B with very slight discoloration, C with slight discoloration but acceptable range, and D with overly permissible range.

[Odor]
10 g of each metalworking oil composition was collected in a 100 mL beaker, and allowed to stand for 15 minutes in a 40 ° C. constant temperature bath with the top covered with a wrap. The wrap was taken immediately after taking out from the thermostat, and the odor was judged 180 seconds later. The point that is not anxious odor is 0 points, the odor is worrisome but 2 points are practical, the point that odors are very worrisome and it is judged that there are problems in practical use, 4 points, The average score of evaluation with 10 people was calculated. An average score of less than 1 point was designated as A, less than 2 points as B, less than 3 points as C, and 3 or more points as D.

Claims (5)

Lubricating base oil,
At least one selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the formula (2);
Alcohol, and
A metalworking oil composition used for processing a workpiece containing aluminum.

[In Formula (1) and Formula (2), R ^{1 to} R ³ each independently represents an alkyl group or an aryl group. ] The metalworking oil composition according to claim 1, wherein the lubricating base oil has a kinematic viscosity at 40 ° C. of 10 mm ² / s or less.   The metalworking oil composition according to claim 1 or 2, wherein a content of an aromatic component in the lubricating base oil is 3% by mass or less.   The metalworking oil composition according to any one of claims 1 to 3, wherein the alcohol content is 0.1 to 12% by mass based on the total amount of the metalworking oil composition. The metalworking oil composition according to any one of claims 1 to 4, wherein the processing is rolling, punching, drawing, ironing, cutting, or grinding.