JP3529069B2 - Metalworking oil composition - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an improved metalworking oil composition, and in particular, it is flame retardant and excellent in metalworkability.
The present invention also relates to a metalworking oil composition used for easy management such as grinding and cutting.

[0002]

2. Description of the Related Art In metal working such as grinding and cutting, the working conditions tend to be severe in recent years as productivity increases due to increased demand. Under such severe conditions, when an oil-based oil agent is used as a lubricant, processing heat,
There is concern about problems such as increased frictional heat and fire. For this reason, a water-soluble, flame-retardant lubricant is used, but in an emulsion or solution that has been conventionally used, since the continuous phase is water, the workability is inferior to that of an oil system. There are drawbacks. On the other hand, a water-solubilized oil is conventionally known as an oil agent comprising a W / O type emulsion in which a continuous phase is oil and water is dispersed (hereinafter referred to as an inverse emulsion). In the case of, since increasing the water content increases the viscosity increase,
There is a problem that it is difficult to handle because a large amount of oil is removed during processing. Further, since a large amount of a surfactant is used as a solubilizing agent, there is a drawback such as poor wastewater treatment.

[0003]

The present invention has been made under such circumstances. That is, the present invention has excellent metal workability, is flame-retardant despite being an inverse emulsion, has a small increase in viscosity, has a small amount of oil carried away during processing, and is excellent in wastewater treatment, and therefore can be managed. An object is to provide a novel metalworking oil composition which is easy.

[0004]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have found that an inverse emulsion type metal prepared by blending a specific amount of a base oil, water and a specific metal sulfonate. The present invention has been completed by finding that the processing oil composition can effectively achieve the above objects of the present invention. That is, the present invention, mineral oil and a base oil 50-9 4.9 wt% selected from synthetic oils, overbased sulfonates of from 0.1 to 30% by weight, and contains water 5-20% by weight A metalworking oil composition is provided.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. The metalworking oil composition of the present invention contains 50 to 98.9% by weight of a base oil selected from mineral oils and synthetic oils. Examples of the mineral oil that can be used in the present invention include, for example, distillate oil obtained by atmospheric distillation of paraffinic crude oil, intermediate crude oil or naphthene crude oil, or distillation oil obtained by vacuum distillation of the residual oil of atmospheric distillation. Oiled oil or refined oil obtained by refining the oil according to a conventional method, for example, solvent refined oil, hydrogenated refined oil, dewaxed treated oil, clay treated oil and the like can be mentioned. The mineral oil has a viscosity of 1.5 to 100 at 40 ° C.
It is preferably mm ² / s. The above viscosity is 1.5mm
^When it is less than ² / s, the working environment is deteriorated due to mist, and when it exceeds 100 mm ² / s, the amount of the oil agent attached to the work piece and carried away increases, which is not economical.
From these points, the viscosity is more preferably 3 to 50 mm ² / s.

The synthetic oil which can be used as the base oil in the present invention is, for example, poly-α-having 8 to 14 carbon atoms.
Olefin, olefin copolymer such as ethylene-propylene copolymer, branched polyolefin such as polybutene and polypropylene, hydrides thereof, fatty acid ester of trimethylolpropane, polyol ester such as fatty acid ester of pentaerythritol, dibasic acid ester, etc. Examples thereof include ester compounds and alkylbenzenes. The viscosity of the above synthetic oil at 40 ° C. is 1.5 to 100 mm ² / for the same reason as in the case of mineral oil.
s, more preferably 3 to 50 mm ² / s. The base oil is contained in the metalworking oil composition of the present invention in an amount of 50 to 98.9% by weight, preferably 70 to 95% by weight. When the amount of the base oil is less than 50% by weight, a stable emulsion is not formed, which is not preferable. In the present invention, the mineral oil or the synthetic oil may be used alone or in combination of two or more as the base oil as long as the amount is within the above range.

Further, the metalworking oil composition of the present invention contains the overbased sulfonate in an amount of 0.1 to 49% by weight. As the overbased sulfonate, an overbased alkali metal sulfonate is particularly preferably used. Specifically, sodium sulfonate, potassium sulfonate, lithium sulfonate, etc. are mentioned. As such an overbased sulfonate, one having a base number of 100 mgKOH / g or more according to JIS K-2501 is used. When the base number is less than 100 mgKOH / g, it is difficult to form a stable inverse emulsion, and the workability in grinding and cutting cannot be maintained. From such a point, the base number is 200 to 600 mg KOH / g, and particularly 300 to 500.
It is preferably in the range of mgKOH / g. If the base number exceeds the above range, the solubility in the base oil may be poor. The above-mentioned overbased sulfonate is contained in the metalworking oil composition of the present invention in an amount of 0.1 to 49% by weight. The above amount
When it is less than 0.1% by weight, it is difficult to form a stable inverse emulsion, and when it exceeds 49% by weight, the viscosity of the oil agent increases and the storage stability decreases, which is not preferable. From these points, the above-mentioned overbased sulfonate is preferably contained in the metalworking oil composition in an amount of 0.5 to 30% by weight, more preferably 1 to 15% by weight.

The metalworking oil composition of the present invention must further contain 1 to 25% by weight of water. The amount of water is 1
If it is less than 25% by weight, flame retardancy cannot be imparted to the metalworking oil composition, and if it exceeds 25% by weight, it is difficult to form a stable inverse emulsion. Therefore, from the viewpoint of flame retardancy and stability, the amount of water is preferably 5 to 20% by weight, more preferably 8 to 15% by weight. The metalworking oil composition of the present invention has a viscosity at 40 ° C. of 1.5 to 5
It is preferably 0 mm ² / s. The above viscosity is 1.5m
When it is less than m ² / s, the working environment is deteriorated due to mist, and when it exceeds 50 mm ² / s, the amount of the oil agent attached to the workpiece and carried away increases, which is not economical.

The metalworking oil composition of the present invention exerts a good effect as an inverse emulsion type composition consisting only of the above-mentioned base oil, overbased sulfonate and water. It is possible to blend a polymer compound. The extreme pressure agent is blended for the purpose of improving workability in grinding oil, cutting oil, etc. From this viewpoint, the sulfur-based extreme pressure agent is preferably used, and examples thereof include polysulfide and sulfurized oil and fat. As the polysulfide, a dialkyl polysulfide having an alkyl group having 6 to 15 carbon atoms (preferably dinonyl polysulfide, didodecyl polysulfide, etc.), an olefin polysulfide (specifically, an olefin having 3 to 20 carbon atoms or its 2 to 4 amount) Those obtained by reacting a body with a sulfiding agent, provided that olefins having 3 to 20 carbon atoms include propylene, isobutene, diisobutene, etc., and sulfiding agents include sulfur, sulfur chloride, sulfur halide, etc. In addition, as sulfurized fats and oils, sulfurized lard, sulfurized rapeseed oil, sulfurized castor oil, sulfurized soybean oil, etc., and further disulfide fatty acids such as sulfurized oleic acid and sulfurized esters such as sulfurized methyl oleate can be used. .

In the present invention, in addition to the above sulfur-based extreme pressure agents, phosphorus-based extreme pressure agents such as phosphoric acid esters and phosphite esters, and chlorine-based extreme pressure agents such as chlorinated paraffins, chlorinated oils and fats, and chlorinated fatty acids. Can also be used. The blending amount of the extreme pressure agent is not particularly limited, but is usually selected in the range of 0.05 to 20% by weight based on the metalworking oil composition. When it is 0.05% by weight or more, extreme pressure property becomes good and abnormal wear of tools can be prevented, and when it is 20% by weight or less, progress of corrosive wear can be suppressed to improve productivity. The adverse effect of can be prevented. From these points, the blending amount is more preferably 0.5 to 10% by weight.

In the present invention, the base oil has a relatively low viscosity,
For example, when the viscosity at 40 ° C. is about 7 mm ² / s or less, it is preferable to add a polymer compound to the base oil in order to effectively suppress the generation of mist during metal working. As such a polymer compound, for example, polymethacrylate, polyisobutylene, olefin copolymer (for example, ethylene-propylene copolymer, styrene-butadiene copolymer, styrene-isoprene copolymer, etc.) and the like are used. And its number average molecular weight is 2,000-
Those of 300,000, and especially those of 2,000 to 150,000 are preferably used. The polymer compound is added in an amount of 0.05 to 20% by weight based on the metalworking oil composition of the present invention. When the content is 0.05% by weight or more, it is possible to sufficiently suppress the generation of mist, and when the content is 20% by weight or less, it is possible to prevent the oil agent from adhering to the workpiece due to the increase in the viscosity. Can be prevented. From such a point, it is more preferable that the blending amount is 0.1 to 5% by weight.

The metalworking oil composition of the present invention further comprises, if necessary, an oiliness agent, an antiwear agent, an antioxidant, a metal deactivator, a sludge dispersant, as long as the object of the present invention is not impaired. A rust preventive agent, a defoaming agent, etc. can be added. As the oiliness agent, for example, carboxylic acid such as oleic acid, stearic acid, dimer acid or the ester thereof can be used, and as the antiwear agent, for example, zinc dithiophosphate (ZnDT) is used.
P), zinc dithiocarbamate (ZnDTC), sulfurized oxymolybdenum dithiophosphate (MoDTP), sulfurized oxymolybdenum dithiocarbamate (MoDT)
C), nickel dithiophosphate (NiDTP), nickel dithiocarbamate (NiDTC) and the like can be used. As the antioxidant, for example, an amine-based or phenol-based antioxidant, as the metal deactivator, for example, thiadiazole, benzotriazole, etc., and as the sludge dispersant, for example, alkenyl succinic acid or its ester or imide, Acid amides, rust preventives such as sorbitan esters, sulfonates of neutral alkaline earth metals, finates, salicylates, etc., and antifoaming agents such as dimethylpolysiloxane, fluoroethers, etc. can be used. . These additives are contained in the composition in an amount of 0.001 to 10% by weight, preferably 0.001 to 5%.
It can be blended in the range of wt%.

The metalworking oil composition of the present invention is preferably applied as a grinding oil, a cutting oil, and the like. In the case of grinding oil, for example, belt grinding of stainless steel plate, rough finishing and finish grinding, creep feed grinding, ultra It is preferably used for finishing. Further, in the case of cutting oil, it is preferably used for turning, drilling, tapping, reaming, boring, broaching, gear cutting, automatic lathe processing and the like. Of the above, the metalworking oil composition of the present invention is particularly suitable as a belt grinding oil.

[0014]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Reference Examples 1 and 2 Water was added to each of the reverse emulsion stock solution (Reference Example 1) and the water-solubilized oil stock solution (Reference Example 2) having the compositions shown in Table 1 in various amounts as shown in Table 1. Then, the kinematic viscosity (mm ² / s) at 40 ° C. was measured for each of them. The results are shown in Table 1. According to Table 1, in the case of the composition of the present invention having a water content of 25% by weight or less (Reference Example 1), the viscosity increase is smaller than that of the solubilized oil.

[0015]

[Table 1]

Reference Examples 3 and 4 10 ml of the inverse emulsion (Reference Example 3) or water-solubilized oil (Reference Example 4) containing 10% by weight of water prepared in each of Reference Examples 1 and 2 and 90 ml of water were 100
Put in a milliliter graduated cylinder, shake and stir,
After standing for 24 hours, the COD value (ppm) of the separated water was measured. The results are shown in Table 2. That is, the inverse emulsion type metalworking oil of the present invention was remarkably superior to the water-solubilized oil in both oil-water separability and wastewater treatability.

[0017]

[Table 2]

Examples 1 to 7 and Comparative Examples 1 to 3 Metal working oils having compositions as shown in Table 3 as Examples 1 to 7 and Reference Example 2 containing 10% by weight of water as Comparative Example 1. The water-solubilized oil was an oil-based belt grinding oil obtained by adding 5% by weight of di-t-nonyl polysulfide to the same paraffinic base oil as used in Examples 1 to 6 as Comparative Example 2, and a comparative example. As No. 3, oils consisting only of the same paraffinic base oils as used in Examples 1 to 6 were prepared. Further, in Example 7, as the base oil, 40
Polymethacrylate with a number average molecular weight of 85,000 in paraffinic mineral oil with a kinematic viscosity of 5.7 mm ² / s at ℃
The one containing 0.6% by weight was used. Using each of the processing oils, the contact wheel type belt grinding machine shown in FIG. 1 was used to grind 10 minutes three times under the following conditions, and the total grinding amount (g) was calculated. It was judged. The results are shown in Table 3. Experimental conditions Belt: DAX AA80 (Sankyo Rikagaku Co., Ltd.) Contact wheel: Neoprene rubber, φ220 mm, land width 10 mm, groove width 10 mm, land angle 45 °, groove depth 10 mm Work material: SUS304 φ140 × 50 W Grinding speed: 1000m / min Grinding material speed: 15m / min Grinding method: Down cut Grinding load power: 2kW

[0019]

[Table 3]

[0020]

[Table 4]

[0021]

EFFECTS OF THE INVENTION According to the present invention, the metal workability is excellent, and even though it is an inverse emulsion, it is flame-retardant, and since the increase in viscosity is small, the amount of oil carried away during processing is small, and the wastewater treatability is excellent. Therefore, it is possible to provide a novel metalworking oil composition that is easy to manage. That is, the metalworking oil composition of the present invention can be made into a stable inverse emulsion simply by mixing and stirring it by a usual method. Further, the conventional inverse emulsion is a highly viscous viscous liquid, but the metal working oil composition of the present invention is characterized by having a small increase in viscosity despite being an inverse emulsion.
Therefore, since the amount of the oil agent attached to the work piece and carried away is small, it is easy to handle and economical. Further, since the metalworking oil composition of the present invention does not use a water-soluble surfactant, even if it accidentally flows into a wastewater pit of a factory, etc., it is separated into an upper layer and does not mix with water in a drainage pit. Has and is easy to remove. Therefore, the COD value of the wastewater does not increase, and the oil agent is excellent in wastewater treatment and is easy to manage. In addition, since the continuous layer of the metalworking oil composition of the present invention is an oil, it is possible to achieve workability similar to an oil-based oil agent.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a contact wheel type belt grinding device used for evaluation of metal workability in Examples.

[Explanation of symbols]

1 grinding belt 2 contact wheels 3 Work material 4 Grinding oil refueling nozzle 5 spline shaft 6 spline bearing 7 Belt track correction bolt 8 tension pulley 9 Air cylinder

Continuation of front page (51) Int.Cl. ⁷ Identification code FI (C10M 173/00 C10N 30:00 B 159: 24) Z C10N 10:02 30:06 30:00 40:20 Z 30:06 40:20 (72) Inventor Noriyuki Imazumi 24, Anezaki Kaigan, Ichihara City, Chiba Prefecture 4 Idemitsu Kosan Co., Ltd. (56) References JP-A 64-90293 (JP, A) JP-A 6-158074 (JP, A) ) JP-A-6-200282 (JP, A) JP-A-6-134506 (JP, A) JP-A-4-170498 (JP, A) JP-A-60-248797 (JP, A) JP-B-50- 31559 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) C10M 163/00 C10M 125/14 C10M 159/24 C10M 173/00-173/02 C10N 10:02 C10N 30:00 C10N 30:06 C10N 40:20-40:24

Claims (6)

(57) [Claims] 1. A base oil selected from mineral oils and synthetic oils is 50
1-9 4.9 wt%, overbased sulfonates of from 0.1 to 30% by weight, and metal working oil composition containing 5 to 20 wt% of water. 2. The metal working oil composition according to claim 1, wherein the overbased sulfonate is an overbased alkali metal sulfonate. 3. The base number of the overbased sulfonate is 100.
The metalworking oil composition according to claim 1 or 2, wherein the metalworking oil composition has a mgKOH / g or more. 4. The metalworking oil composition according to claim 1, further comprising a sulfur-based extreme pressure agent. 5. The metal working oil composition according to claim 1, which is an inverse emulsion type. 6. The metal working oil composition according to claim 1, which is used for grinding or cutting.