JPH08231977A - Water-soluble metal processing oil - Google Patents

Abstract

(57) [Summary] [Object] To provide a water-soluble oil for metalworking which is excellent in properties such as lubricity, penetrability and defoaming property without requiring the addition of a defoaming agent or the like. [Structure] 37.9 parts by weight of water (hereinafter referred to as "part"),
A so-called reverse block type poly having a structure in which 5 parts of caprylic acid, 2 parts of sebacic acid, 25 parts of triethanolamine, 0.1 part of benzotriazole, and oxypropylene chains are bound to both sides of the oxyethylene chain. Oxyalkylene glycol block copolymer (molecular weight;
12,500, cloud point of aqueous solution;
It melt | dissolved and the water-soluble metal processing oil agent was obtained.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is a lubricating oil agent used for metal working such as cutting, grinding, plastic working, etc., which is excellent in lubricity and also has good penetrability and defoaming property. An oil agent for metal processing.

[0002]

2. Description of the Related Art Polyoxyalkylene glycols are
It may be used as a component of an oil agent for water-soluble metal processing because it has the property of improving the penetrability that affects the wetting of the oil agent to the tool and the work material, and as a result, improving the lubricity of the oil agent. However, when a surfactant such as polyoxyalkylene glycol is used together with each of the other components as an oil agent component, there is a problem in that foaming significantly occurs and workability is deteriorated.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and uses a polyoxyalkylene glycol having a specific structure and the like and a mono- and / or dicarboxylic acid having a specific carbon number as an oil agent component. By
It is an object of the present invention to provide a water-soluble oil agent for metalworking, in which generation of bubbles is suppressed and which is excellent in lubricity and permeability.

[0004]

Means for Solving the Problems As a result of intensive studies on the relationship between the structure of polyoxyalkylene glycol and the performance of an oil agent for metalworking, the present inventors have found that polyoxyalkylene glycol having a specific block structure, etc. The inventors have found that when a polymer is used in combination with a specific mono- and / or dicarboxylic acid, an oil agent exhibiting excellent lubricating performance can be obtained without generating bubbles, and the present invention has been completed.

The water-soluble metalworking oil agent of the present invention is an oil agent 1.
In 100 parts by weight, 0.1 to 80 parts by weight of polyoxyalkylene glycol represented by the following general formula and 6 to 6 carbon atoms are included.
10 monocarboxylic acids and / or dicarboxylic acids 1 to 25
An oil solution containing parts by weight, (However, in the formula, a, b and c are integers of 1 or more.) The polyoxyalkylene glycol has a molecular weight of 500.
˜30000, and the cloud point of the aqueous solution measured by the following method is 5 to 60 ° C. Method for measuring cloud point: A 1 wt% aqueous solution of the polyoxyalkylene glycol is prepared, the prepared solution is heated, and the temperature at which cloudiness is visually confirmed is defined as the cloud point.

The above "polyoxyalkylene glycol"
Is a block copolymer having a structure in which a block portion composed of an oxypropylene unit is bonded to both sides of a block portion composed of an oxyethylene unit. The block copolymer having such a structure is particularly called a reverse block type polymer, and for example, trade name "ADEKA Pluronic 25R2" manufactured by Asahi Denka Co., Ltd. and BASF J
Product name “Pluronic 25R4, 25
R8 ”and the like are commercially available.

In the above general formula, the molecular weight of polyoxyalkylene glycol is 500 to 30,000, and particularly preferably 600 to 20,000. If the molecular weight is less than 500, the lubricity of the oil agent will be reduced, and if it exceeds 30,000, the viscosity of the oil agent will be too high and the workability such as malfunction of the processing machine will be deteriorated. In addition, when the molecular weight is in the range of 600 to 20,000, not only has excellent lubricity, but also the viscosity of the oil agent is appropriate and workability is good.

When the total amount of the oil agent is 100 parts by weight, the content of polyoxyalkylene glycol is 0.
It is 1 to 80 parts by weight, and particularly preferably 3 to 50 parts by weight. If the content is less than 0.1 parts by weight, sufficient lubricating performance will not be exhibited, and if it exceeds 80 parts by weight, the viscosity of the oil agent will be too high and the workability will be deteriorated.

Further, the cloud point of the above-mentioned aqueous solution of polyoxyalkylene glycol is in the range of 5 to 60 ° C., and although this cloud point has a correlation with the molecular weight, it is preferably in the range of 10 to 55 ° C. When the cloud point is less than 5 ° C, the liquid stability of the oil agent decreases, and 6
If the temperature exceeds 0 ° C, lubricity and permeability will be insufficient.

Further, in the above-mentioned "monocarboxylic acid and / or dicarboxylic acid having 6 to 10 carbon atoms", when the carbon number is less than 6, the antirust property of the oil agent is low, and when it exceeds 10, the defoaming property is obtained. Is not enough and is a problem. Preferred carboxylic acids include caprylic acid, which is a monocarboxylic acid having 8 carbon atoms, sebacic acid, which is a dicarboxylic acid having 10 carbon atoms, and the like, and mono and / or dicarboxylic acids having 6 to 10 carbon atoms are thus exemplified. preferable.

The content of the above mono- and / or dicarboxylic acid is 1 to 25 when the total amount of the oil agent is 100 parts by weight.
Parts by weight, particularly preferably 3 to 20 parts by weight.
If the content is less than 1 part by weight, the oil agent has no rust-preventing effect, and if it exceeds 25 parts by weight, the viscosity of the stock solution (oil agent) becomes too high, which is not preferable.

The metalworking oil composition of the present invention is an aqueous solution or emulsion of the above polyoxyalkylene glycol and carboxylic acid, either as it is or, if necessary, as a fat or oil, fatty acid ester, mineral oil, extreme pressure additive, polyoxyalkylene glycol. Other than the above, a surfactant, a rust preventive, an antifoaming agent, various amines, an antiseptic and the like can be appropriately added and prepared and used.

[0013]

[Function] When a polyoxyalkylene glycol or other surfactant is used as a component of the water-soluble metalworking oil,
There are problems that foaming is likely to occur and the permeability of the oil agent is insufficient. Therefore, measures such as adding an antifoaming agent have been taken conventionally. In the present invention, the above-mentioned problem is solved by using a polyoxyalkylenelene copolymer, which is a so-called reverse block type polymer, having a specific block structure as the main component of the oil agent.

In the present invention, instead of the polyoxyalkylene glycol having the above-mentioned specific structure, for example, even if the oxyethylene and oxypropylene units are the same in number, oxyethylene units are formed on both sides of the block portion composed of oxypropylene units. When a block copolymer having a structure in which block portions are bonded (normal block type polymer) is used, the permeability of the obtained oil agent is good, but the problem of foaming is not solved. Further, in the case of a random copolymer, the obtained oil agent has almost no permeability, and the wettability with respect to the work material or the like decreases.

Further, even when a reverse block type polymer is used as the polyoxyalkylene glycol, long chain mono- and / or polycarboxylic acid having a carbon number of more than 10 is used.
Alternatively, in the case of an oil agent in which a dicarboxylic acid is combined, a problem of foaming occurs, liquid stability is good, and an oil agent excellent in all properties such as lubricity, permeability and defoaming property cannot be obtained.

[0016]

EXAMPLES Hereinafter, the water-soluble metalworking oil agent of the present invention will be described in more detail with reference to Examples and Comparative Examples. Table 1 shows the compositions of the oil agents for metalworking of Examples 1 to 4 and Comparative Examples 1 to 4. The numerical values of each component in Table 1 represent parts by weight, and the total amount is 1
It is 00 parts by weight. Further, each polyoxyalkylene glycol in Table 1 is as follows.

[0017]

[Table 1]

Polyoxyalkylene glycol (A): reverse block type polymer, BASF Japan
An company, trade name "25R-4", molecular weight; 4100,
Cloud point: 40 ° C. Polyoxyalkylene glycol (B): reverse block type polymer, manufactured by BASF Japan, trade name “25R-8”, molecular weight: 12500, cloud point 45 ° C.

Polyoxyalkylene glycol (C): reverse block type polymer, BASF Japan
An company make, brand name "10R-5", molecular weight; 2000,
Cloud point: 69 ° C. Polyoxyalkylene glycol (D): normal block polymer, manufactured by BASF Japan, trade name “P65”, molecular weight: 3500, cloud point; 82 ° C. Polyoxyalkylene glycol (E): random weight Combined, manufactured by Asahi Denka Co., Ltd., trade name "PH255", molecular weight; 3000, cloud point; 61 ° C

In order to clarify the performance of the metalworking oil composition of the present invention, a performance test was conducted by the following method. (Lubricity) It was measured under the following conditions using a Falex tester. Pressure: 200 lbf, rotation speed: 290 rp
m, measurement time; 1 hour and sample concentration; the amount of wear (mg) of the pin and block was measured with a 3% aqueous solution.

(Permeability) Iron powder (particle size: 50-100 m)
The sample diluted with a 3% aqueous solution was poured onto the bottom surface of a conical body having a predetermined size, which was molded by using Esh), and the time required to wet the top was measured. The evaluation criteria are: ◯: the sample solution smoothly reaches the top and is good, Δ: Somewhat good, ×: It takes a long time for the sample solution to reach the top, and is poor.

(Antifoaming property) Sample 50 diluted with 3% aqueous solution
ml was put into a 100 ml cylinder, shaken for 10 seconds, and the time until the bubbles disappeared was measured. The evaluation standard is
◯: Rapid defoaming is good, Δ: Slightly good, ×: Defoaming requires a long time and is poor. Table 2 shows the results of the above performance evaluation.

[0023]

[Table 2]

According to the results shown in Table 2, in each of the examples using the polyoxyalkylene glycol and the carboxylic acid specified in the present invention, the permeability and the defoaming property are excellent, and the wear amount is small and the lubricating property is also good. It turns out that In particular, in Example 3 in which the molecular weight of polyoxyalkylene glycol was relatively large as 12500, the amount of wear was very small and the lubricity was more excellent. Further, in Example 2 in which the amount of polyoxyalkylene glycol used in Example 3 was reduced to 5.0 parts by weight, the amount of wear increased, but it was still superior to each comparative example, and was further increased to 60 parts by weight. It can be seen that in Example 4 in which the amount is set, the amount of wear is smaller and the lubricity is further improved.

On the other hand, the polyoxyalkylene glycol is a reverse block type polymer having a cloud point of 69 ° C.
In Comparative Example 1 in which the upper limit was slightly exceeded, the penetrability and the defoaming property were Δ, the wear amount was considerably large, and each property was inferior. Further, in Comparative Example 2 in which a normal block polymer having a very high cloud point of 82 ° C. was used, the permeability was good even though the cloud point was high, but the lubricity and It can be seen that the defoaming property is inferior.

Further, in Comparative Example 3 using the random type polymer, it can be seen that the defoaming property is not so lowered, but the lubricity and especially the penetrability are greatly lowered. Further, it can be seen that the oil agent of Comparative Example 4 prepared in the same manner as in Example 3 was inferior in defoaming property except that lauric acid which was a monocarboxylic acid having 12 carbon atoms was used as the carboxylic acid.

[0027]

EFFECTS OF THE INVENTION According to the present invention, it is possible to obtain a water-soluble metalworking oil agent which is excellent in lubricity, penetrability and defoaming property and has good liquid stability, without the need for compounding an antifoaming agent or the like. You can

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area C10M 129: 40 129: 42) C10N 20:00 20:04 30:06 30:18 40:22

Claims (1)

[Claims] 1. A polyoxyalkylene glycol of 0.1 to 80 represented by the following general formula in 100 parts by weight of an oil agent.
An oil agent containing 1 to 25 parts by weight of a monocarboxylic acid and / or dicarboxylic acid having 6 to 10 carbon atoms, (However, in the formula, a, b and c are integers of 1 or more.) The polyoxyalkylene glycol has a molecular weight of 500.
The water-soluble oil agent for metalworking, which has a cloud point of 5 to 60 ° C., measured by the following method. Method for measuring cloud point: A 1 wt% aqueous solution of the polyoxyalkylene glycol is prepared, the prepared solution is heated, and the temperature at which cloudiness is visually confirmed is defined as the cloud point.