JP2000160186A - Water soluble metal processing oil agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water soluble metal processing oil agent exhibiting excellent lubricity, surface property and rust preventive property without adding a chlorine-based or a sulfur-based extreme pressure. SOLUTION: This water soluble metal processing oil agent contains (a) 2-20 pts.wt. of at least one kind selected from polypropylene glycol or polybutylene glycol having 800-5,000 average molecular weight and (b) 1-15 pts.wt. of dibasic acid in 100 pts.wt. of the total agent. The metal processing oil agent exhibits excellent rust preventive property and can exhibit excellent lubricity without adding an extreme pressure additive. Therefore, a trouble caused by occurrence of rust in a processed product or a processing machine can be avoided. An improvement of a processing efficiency can be contrived by making a processing speed higher. Furthermore, a state generating a harmful combustion gas can be avoided in an incineration treatment of a waste liquid of an oil agent added with a chlorine-based or a sulfur-based additive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-soluble metal working oil, and more particularly, the present invention is used in metal working such as cutting and grinding, and is particularly excellent in lubricity, surface properties and rust prevention. Water-soluble metal working oil.

[0002]

2. Description of the Related Art In metal processing such as metal cutting and grinding, lubrication and cooling between a workpiece and a tool are intended to improve machining efficiency, improve product accuracy and extend tool life by increasing speed. An oil for metalworking is used. In particular, in recent years, the speed of metal processing such as cutting and grinding has been accelerated to improve processing efficiency. As a result, heat generation between the workpiece and the tool has increased, and water-insoluble metal processing mainly composed of mineral oil and the like has been performed. As the oil agent, there is a danger of smoking or igniting, and therefore, a water-soluble metal processing oil agent having excellent cooling properties and non-flammable water as a main component is used.

However, the water-soluble metal working oil contains water as a main component, and therefore has excellent cooling properties as described above.
While it has the advantage of no flammability, it also has the disadvantage of causing rust on processed products and machines. Further, in such a water-soluble metal working oil, an oil agent such as fats and oils, synthetic esters and the like, and an extreme pressure additive selected from chlorine, sulfur, phosphorus compounds and the like are blended in order to improve lubricity. However, extreme pressure additives are generally viscous, and water diluents may become opaque when incorporated into processing oils. As a result, there is a problem that not only does the work part become invisible, or the window for observing the metal machine tool becomes cloudy, but also the work is hindered and the machine tool and the work site are contaminated. Moreover, since the processing oil containing the extreme pressure additive sometimes has poor cooling properties, it has a drawback that it may not be applicable to high-speed processing in which a large amount of processing heat is generated. Furthermore, when a sulfur-based extreme-pressure additive is blended, it has the disadvantage of rapid deterioration due to decay, and when a chlorine-based extreme-pressure additive is blended, it causes corrosion and rust of machine tools and processed products. Disadvantage. In addition, oils containing chlorine-based or sulfur-based extreme pressure additives may generate harmful combustion gases when incinerating waste liquids.
It is hard to say that it is preferable from the viewpoint of preventing environmental pollution.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has excellent lubricating properties without adding the chlorine-based and sulfur-based extreme pressure additives which are problematic from the viewpoint of environmental pollution. An object of the present invention is to provide a water-soluble metalworking oil agent which exhibits excellent rust prevention while exhibiting surface properties and containing water as a main component.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, when a polyalkylene glycol having a specific structure and a dibasic acid are added in combination, excellent lubricity is obtained. The present inventors have found that a water-soluble metal working oil agent exhibiting high rust resistance can be obtained, thereby completing the present invention. That is, the water-soluble metal working oil agent of the first invention is characterized by containing (a) a polyalkylene glycol containing no monomer having 2 or less carbon atoms and (b) a dibasic acid.

[0006] The above-mentioned "(a) polyalkylene glycol containing no monomer having 2 or less carbon atoms" (hereinafter simply referred to as "(a) polyalkylene glycol") has a low solubility in water and has a low metal surface. It exhibits excellent lubricity by firmly adsorbing to the surface. When a monomer having 2 or less carbon atoms is contained, the work material is poorly adsorbed on a metal surface, and as a result, lubricity and rust prevention are undesirably reduced. As such a polyalkylene glycol,
One or more selected from polypropylene glycol or polybutylene glycol as in the second invention is particularly preferable. The average molecular weight of the polyalkylene glycol (a) is from 800 to 5,000, preferably from 1,000 to 4,000, more preferably from 1,100 to 4,000 as in the fourth invention.
3,500. If the average molecular weight is less than 800, the lubricating property is inferior, which is not preferable.
If it exceeds 00, it becomes difficult to solubilize the oil solution, and the water diluent may become cloudy at the time of dilution or may be separated over time, which is not preferable.

The above-mentioned "(b) dibasic acid" exhibits excellent lubricity by forming a stronger adsorption film on the metal surface than the conventionally used fatty acids.
As the dibasic acid, for example, succinic acid, fumaric acid,
Maleic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, alkenyl succinic acid, sebacic acid, dodecanedioic acid, linoleic acid-acrylic acid adduct and the like can be mentioned. In particular, alkenyl succinic acid and linoleic acid-acrylic acid adduct are preferable because they have excellent lubricity and strong solubilizing power, and are also excellent in rust prevention.
The linoleic acid-acrylic acid adduct is a reaction adduct of a linoleic acid derivative and an acrylic acid derivative,
Specific examples include compounds obtained by the following reactions.

[0008]

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The mixing ratio of each component in the water-soluble metal working oil of the present invention is 100% as in the third invention.
When it is used as a weight part, the content of the polyalkylene glycol (a) is 2 to 20 parts by weight, preferably 4 to 18 parts by weight, more preferably 6 to 16 parts by weight. If the content is less than 2 parts by weight, the lubricating property is poor, so that it is not preferable. If the content exceeds 20 parts by weight, the aqueous dilution of the oil agent becomes unstable or the viscosity of the stock solution becomes too high, so that it is preferable in use. Absent. The content of the dibasic acid (b) is 1 to 15 parts by weight, preferably 2 to 13 parts by weight, and more preferably 4 to 11 parts by weight. If the content is less than 1 part by weight, the lubricating property and rust-preventing property are deteriorated, which is not preferable.

The water-soluble metal working oil of the present invention contains the above-mentioned (a) polyalkylene glycol and (b) dibasic acid as essential components, but usually maintains the basic performance as a water-soluble metal working oil. In order to do so, various additives can be appropriately added as needed as long as the object of the present invention is not impaired. For example, fatty acid esters, surfactants,
Antifoaming agents, various amines, preservatives, and the like can be appropriately added as needed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The water-soluble metal working oil agent of the present invention will be specifically described below with reference to examples and comparative examples. (1) Preparation of Water-Soluble Metalworking Oil The components of Examples and Comparative Examples of the present invention are shown below. First, an alkanolamine, benzotriazole and water were mixed to prepare an aqueous solution of the following components in a ratio of parts by weight shown in Table 1, and then a fatty acid, an alkylene glycol and a mineral oil (only Comparative Examples 3 and 6) were added. Then, a transparent liquid was prepared to prepare the water-soluble metal working oils of Examples 1 to 6 and Comparative Examples 1 to 6. [1] Polypropylene glycol a: trade name “SANNIX PP1200”, manufactured by Sanyo Chemical Industries, Ltd. (molecular weight: 1)
150) [2] Polypropylene glycol b: trade name “SANNIX PP3000” manufactured by Sanyo Chemical Industries, Ltd. (molecular weight: 3
000) [3] Polybutylene glycol: trade name “PTMG14
00 ", manufactured by Sanyo Chemical Industries, Ltd. (molecular weight: 1400) [4] Polyethylene glycol: trade name" PEG200 "
0 ", manufactured by Sanyo Chemical Co., Ltd. (molecular weight 2000) [5] Polyethylene polypropylene glycol: trade name" 50MB26 ", manufactured by NOF Corporation (ethylene oxide / propylene oxide = 1: 1, molecular weight 2000) [6] Alkenyl succinic acid: Product name "Pavelas NP",
Mitsubishi Chemical Co., Ltd. [7] Linoleic acid acrylic acid adduct: trade name “Diacid 1550”, Harima Chemical Co., Ltd. [8] α, ω-didodecanoic acid: trade name “dodecane diacid”, Ube Industries, Ltd. [9] Oleic acid: trade name “oleic acid”, manufactured by NOF Corporation [10] Ricinoleic acid: trade name “TOENOL600”
LS ", manufactured by Toe Chemical Co., Ltd. [11] Caprylic acid: trade name" CPS ", manufactured by Shin Nippon Rika Co., Ltd. [12] Mineral oil: trade name" TY Oil ", manufactured by Nippon Oil Co., Ltd. [13] Chlorination Paraffin: Product name "Toyo Parax A
50 ", manufactured by Tosoh Corporation (20 to 32 carbon atoms, a chlorine content of 50 wt%) [14] polysulfide trade name" TDPS "Erufa preparative Kem Japan Ltd., ([C ₁₂ H _{22] 2} S _5, (Sulfur content 32% by weight)

[0012]

[Table 1]

(2) Performance Test In order to clarify the performance of the water-soluble metal working oils of Examples and Comparative Examples, performance tests were conducted by the following method. The results are shown in Table 1 above. (A) Lubricity The water-soluble metal working oils of Examples 1 to 6 and Comparative Examples 1 to 6 were diluted with water to a concentration of 5% by weight, and the performance of the oil at the time of tapping and reaming was examined. Processing was performed under the following conditions. [1] Tapping torque Aluminum alloy AC4C (T6 treatment, hardness: HB85) was used as a work material, and this was 9272 manufactured by Kistler.
The work material was processed in the order of drill, reamer, and tap with the following equipment and conditions while holding the dynamometer. And the torque at the time of tapping is measured, and AR1 made by Yokogawa Electric Corporation is used.
Recorded on 100A Analyzing Recorder. Machine tool: Vertical machining center VG45 (Hitachi Seiki Co., Ltd.) Drilling: Taper shank twist drill (Kobe Steel), φ12.5, SKH51, cutting speed 20m /
Min, feed 0.3mm / rev Reaming: Taper shank machine reamer (Okazaki Seiko), φ13.3, cobalt high speed (SKH55-5)
6), cutting speed 9.1 m / min, feed 0.3 mm / rev Tapping: Roll tap (manufactured by OSG) M14 × 1.
5mm, SKH58 (oxidation treatment), cutting speed 4.4m /
Minutes, catch rate 85% [2] Roughness after reaming Using the machine tool and work material of [1] above, reaming is performed under the following conditions, and a tertiary product of Tokyo Seimitsu Co., Ltd. is used as a measuring instrument. Original surface roughness profile measuring device Surfcom57
Using 0A-30DF, the surface roughness (μm) of the work material after processing was measured. Drilling: Taper shank twist drill (Kobe Steel), # 12.5 Reaming: Carbide V reamer (Omi Industry Co., Ltd.),
φ10, V = 60m / min, f = 0.2mm / rev

(B) Rust prevention properties Cast iron chips were placed in a glass petri dish and diluted with water until the chips were completely immersed in water so that the concentrations were 5%, 3% and 2%. 6 and Comparative Examples 1 to 6 were poured. Thereafter, the plate was covered with the lid and allowed to stand for 10 minutes, and then the diluent was allowed to flow out while the petri dish was inclined while keeping the lid. Next, the petri dish was placed on a horizontal table, and left in this state for 24 hours to observe and evaluate the occurrence of rust.
In the display of the evaluation of rust prevention in Table 1, “◎” indicates that no rust was generated, and the numerical value indicates the rust generation rate (%).

(3) Effects of the Examples Examples 1 to 6 show a torque value that is important for examining the lubricating performance of a metal working oil and a surface roughness of a product after reaming for evaluating surface properties. In comparison with Comparative Examples 1 to 6, in Comparative Example 4 containing no component (a), baking occurred and the surface roughness of the product showed a considerably large value. In Comparative Examples 1 and 2 containing polyethylene glycol or the like as the component (a), the torque value was 2
Examples 1 to 000 or more and 1600 or less
Considerably larger than 6. Further, the surface roughness of the product also shows a value about 10 times or more as large as that of Examples 1 to 6. In addition, when Comparative Examples 5 and 6 containing only the component (a) and Comparative Examples 1 and 4 containing only the component (b) are compared with Examples 1 to 6, Comparative Examples 1, 4 and 5 are all more than those of the Examples. Large torque value and rough surface. That is, it can be seen that the effects of the present invention cannot be exerted only by the component (a) or the component (b), and that the combination of the two provides excellent lubricity and surface properties. Further, in the case of Comparative Example 3, the torque value and the surface roughness of the product were considerably improved, and the values were close to those of the Examples, but still larger than those of Examples 1 to 6. Moreover, Comparative Example 3 still contains mineral oil in a large amount of 60 parts by weight, which is still the result. If it is contained in such a large amount, it is not preferable because the advantages of the water-soluble metal working oil agent, that is, the effects of cooling by water and preventing smoke emission by the oil agent component are lost. On the other hand, Examples 1 to 6 all have small torque values and surface roughness. In particular, Example 3 containing 8 parts by weight of the component (a) and 4 parts by weight of the component (b) has a small torque value and surface roughness. Since each of them shows a small value, it can be seen that they are particularly excellent in lubricity and surface properties. Moreover, even when compared with the comparative example 6 including the conventionally used extreme pressure additive, the torque values of the examples 1 to 6 are smaller than those of the comparative example 6, and the surface roughness is considerably improved. Even without including extreme pressure additives that have been used to improve lubricity,
It turns out that it is excellent in lubricity and surface property.

Further, when comparing Examples 1 to 6 and Comparative Examples 1 to 6 with respect to rust prevention, all of them have excellent rust prevention at a concentration of 5%. However, with further dilution, the concentration was 3
%, No rust was observed in Examples 1 to 6, whereas rust was already generated in Comparative Examples other than Comparative Example 3. This indicates that the component (a) or the component (b) alone cannot exhibit the rust-preventive property, and that the combination of the two provides excellent rust-preventive property. In Comparative Example 3, no rust was observed, but the mineral oil component was 60%.
%, It can exhibit rust prevention properties only when it is contained in a considerably large amount. However, such a large amount of mineral oil component is not preferable because the advantage of the water-soluble metal working oil is lost as described above. Further, when the concentration was diluted to 2%, no rust was observed in Examples 1 to 6, whereas rust was generated in all Comparative Examples 1 to 6. Therefore, it can be seen that Examples 1 to 6 exhibit excellent rust prevention especially at low concentrations. As a result, the amount of the stock solution of the water-soluble metal working oil used once can be reduced, which is economically advantageous.

The present invention is not limited to the specific embodiments described above, but may be variously modified within the scope of the present invention according to the purpose and application. That is,
The water-soluble metal working oil agent of the present invention is not limited to the compositions and mixing ratios shown in Table 1, but may be various compositions and mixing ratios within the scope of the present invention.

[0018]

EFFECT OF THE INVENTION The water-soluble metal working oil agent of the present invention has excellent rust prevention properties by containing a specific glycol component and a dibasic acid as essential components, and has an extreme pressure additive. Even without it, excellent lubrication can be exhibited. As a result, in a water-soluble metal working oil agent containing water as a main component, it is possible to avoid troubles caused by rusting of a processed product or a processing machine. Further, since excellent lubricity is exhibited, cutting, grinding, and plastic working can be performed at a high speed, so that working efficiency can be improved. Furthermore, even without adding an extreme pressure additive for improving lubricity,
Problems that occur when adding extreme pressure additives, such as deterioration due to decay caused by sulfur-based extreme pressure additives, machine tools and processing caused by chlorine-based extreme pressure additives, because they can exhibit excellent lubricity The product can avoid corrosion and rust of the product, and also can avoid the generation of harmful combustion gas when incinerating oil solution waste containing chlorine or sulfur-based extreme pressure additives. A favorable effect is exhibited also from the viewpoint of prevention.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10M 145: 34 129: 34 129: 46 129: 42) C10N 20:04 30:06 30:12 40:22 (72) Inventor Toru Kadokawa 1580 Tabata, Samukawa-cho, Koza-gun, Kanagawa Prefecture Inside (72) Inventor Minoru Sudo 1580 Tabata, Sakawa-cho, Takaza-gun, Kanagawa Prefecture F-term (reference) 4H104 BB16R BB17R BB18C BB20C BC06C CB16A CB17A EA03A EA17R LA03 LA06 PA21 QA05

Claims (4)

[Claims] 1. A water-soluble metal working oil comprising (a) a polyalkylene glycol containing no monomer having 2 or less carbon atoms and (b) a dibasic acid. 2. The water-soluble metal working oil according to claim 1, wherein the component (a) is at least one selected from polypropylene glycol and polybutylene glycol. 3. The content of the component (a) is 2 to 20 parts by weight and the content of the component (b) is 1 to 15 parts by weight based on 100 parts by weight of the whole water-soluble metal working oil. The water-soluble metal working oil agent according to claim 1 or 2, wherein 4. The component (a) having an average molecular weight of 800 to 800.
The water-soluble metal working oil agent according to any one of claims 1 to 3, which is 5000.