Metal working fluid and metal working method

Abstract

To provide a metal working fluid excellent in defoaming ability and processability.SOLUTION: A metal working fluid comprises neodecanoic acid, octanoic acid, an organic amine, and water, wherein, based on 100 pts.wt of the entire metal working fluid, the content of a mixture of the neodecanoic acid and the octanoic acid is 5 pts.wt. or more and 7 pts.wt. or less, the content of the organic amine is 30 pts.wt. or more and 40 pts.wt. or less, and the content of the water is 50 pts.wt. or more and 60 pts.wt. or less, and wherein a weight ratio of the neodecanoic acid to the octanoic acid is 1:0.1 to 1:5.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a metalworking oil and a metalworking method using the same. [Background technology]

[0002] Metalworking fluids have been used for lubrication purposes in the field of metalworking, such as cutting and grinding. Known examples of such metalworking fluids include metalworking fluids containing a silicone-based antifoaming agent to suppress foaming caused by lubricating components (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5487516 Summary of the Invention [Problem to be solved by the invention]

[0004] In metalworking fluids containing an antifoaming agent, the low surface tension of the antifoaming agent can cause the antifoaming agent to repel liquids if it remains on the metal material being processed, which can affect the secondary workability of the metal material. Furthermore, the antifoaming agent is easily carried out of the system during processing of the metal material, which reduces the antifoaming ability of the metalworking fluid after the antifoaming agent is carried out. Therefore, there has been a demand for a method to suppress foaming without using an antifoaming agent.

[0005] A primary object of the present disclosure is to provide a metalworking fluid that has excellent antifoaming properties and excellent processability. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that a metalworking fluid containing neodecanoic acid, a straight-chain fatty acid, an organic amine and water has excellent defoaming properties and processability, and have thus completed the present invention.

[0007] That is, a metalworking oil according to one embodiment of the present disclosure contains neodecanoic acid, octanoic acid, an organic amine, and water, and, relative to 100 parts by weight of the entire metalworking oil, the content of the mixture of the neodecanoic acid and the octanoic acid is 5 parts by weight or more and 7 parts by weight or less, the content of the organic amine is 30 parts by weight or more and 40 parts by weight or less, the content of the water is 50 parts by weight or more and 60 parts by weight or less, and the weight ratio of the neodecanoic acid to the octanoic acid is 1:0.1 to 1:5.

[0008] In the metalworking oil agent, the weight ratio of the neodecanoic acid to the straight-chain fatty acid may be 1:0.1 to 1:5.

[0009] In the metalworking oil agent, the straight-chain fatty acid may have 8 to 9 carbon atoms.

[0010] A metalworking oil according to one embodiment of the present disclosure contains neodecanoic acid, an organic amine, and water.

[0011] A metalworking method according to one aspect of the present disclosure processes a metal material using any of the metalworking oils described above. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to realize a metalworking oil agent that has excellent antifoaming properties and excellent processability. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a graph showing the relationship between the molar fraction of neodecanoic acid and the defoaming properties and processability based on Examples 1, 4 to 6, Example 7, and Comparative Example 1, all of which have the same number of carbon atoms in the straight-chain fatty acids. [Figure 2] 1 is a graph showing the relationship between the molar fraction of neodecanoic acid and the defoaming properties and processability based on Example 2, Example 3, and Comparative Example 2, in which the number of carbon atoms in the straight-chain fatty acid is the same. [Figure 3] 1 is a graph showing the relationship between the number of carbon atoms in a straight-chain fatty acid and the antifoaming properties and processability based on Comparative Examples 1 to 3. [Figure 4] 1 is a graph showing the relationship between the molar fraction of isononanoic acid and the defoaming properties and processability based on Comparative Example 2 and Comparative Examples 4 to 6. [Figure 5] 1 is a graph showing the relationship between the molar fraction of octylic acid and the defoaming properties and processability based on Comparative Examples 8 to 10 and 14. [Figure 6] 1 is a graph showing the relationship between the molar fraction of octylic acid and the defoaming properties and processability based on Comparative Examples 11 to 14. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present disclosure will be described in detail.

[0015] (metalworking oil) A metalworking oil according to an embodiment of the present invention contains neodecanoic acid, a straight-chain fatty acid, an organic amine, and water.

[0016] The metalworking oil according to the embodiment contains neodecanoic acid and a straight-chain fatty acid as fatty acids. By using neodecanoic acid and a straight-chain fatty acid in combination, a synergistic effect due to the coexistence of the two is significantly exhibited, and it is possible to achieve both excellent defoaming properties and processability.

[0017] Neodecanoic acid is a fatty acid with a branched alkyl group and 10 carbon atoms. The straight-chain fatty acid is a fatty acid having a straight-chain alkyl group. The straight-chain fatty acid may be either a saturated fatty acid or an unsaturated fatty acid, and is preferably a saturated fatty acid. From the viewpoint of enhancing the synergistic effect of the straight-chain fatty acid and neodecanoic acid and obtaining excellent defoaming properties and processability, the straight-chain fatty acid preferably has 8 to 9 carbon atoms, and more preferably has 9 carbon atoms. Examples of straight-chain fatty acids include octanoic acid, nonanoic acid, and decanoic acid. Among these, octanoic acid and nonanoic acid are preferred, and nonanoic acid is more preferred. The straight-chain fatty acids may be used alone or in combination of two or more.

[0018] The content of neodecanoic acid and straight-chain fatty acid is preferably 1:0.1 to 1:5 by weight ratio (neodecanoic acid:straight-chain fatty acid). By using neodecanoic acid and straight-chain fatty acid in combination within the above ratio range, the synergistic effect of the coexistence of the two is enhanced, achieving both excellent defoaming properties and processability, and improving the liquid stability of the metalworking oil. The content of neodecanoic acid and straight-chain fatty acid is more preferably 1:1 to 1:5 or 1:1.5 to 1:5, even more preferably 1:1.8 to 1:5, and most preferably 1:1.8 to 1:4.6.

[0019] The content of the mixture of neodecanoic acid and straight-chain fatty acid in the metalworking oil is not limited, but is preferably 5 to 7 parts by weight, based on the total amount of the metalworking oil, where the entire metalworking oil is taken as 100 parts by weight. In this case, excellent defoaming properties and processability can be achieved simultaneously, and the liquid stability of the metalworking oil can be improved. The lower limit of the content of the mixture of neodecanoic acid and straight-chain fatty acid is more preferably 5.5 parts by weight, and even more preferably 5.7 parts by weight. The upper limit of the content of the mixture of neodecanoic acid and straight-chain fatty acid is more preferably 6.5 parts by weight, and even more preferably 6.2 parts by weight.

[0020] The metalworking oil according to the embodiment contains water. The water used may be tap water, industrial water, ion-exchanged water, distilled water, or the like, and may be hard or soft. The water content in the metalworking oil can be appropriately determined depending on the types and contents of other ingredients. For example, the water content is preferably 50 to 60 parts by weight, based on the total amount of the metalworking oil, where the total amount of the metalworking oil is 100 parts by weight. In this case, excellent defoaming properties and processability can be achieved, and the liquid stability of the metalworking oil can be improved.

[0021] The metalworking oil according to the present embodiment contains an organic amine. Examples of the organic amine include monoamines such as methylamine and dimethylamine, diamines such as ethylenediamine, and triamines such as diethylenetriamine; alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, aminoethylethanolamine, and N-methylethanolamine; aromatic amines; and aralkylamines such as benzyldialkylamine and tribenzylamine. From the viewpoints of achieving both excellent defoaming properties and processability and improving the liquid stability and corrosion resistance of the metalworking oil, alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, aminoethylethanolamine, and N-methylethanolamine are preferred, with triethanolamine being more preferred. One organic amine may be used alone, or two or more organic amines may be used in combination.

[0022] The content of organic amine in a metalworking oil can be set appropriately depending on the types and contents of other blended components. For example, the content of organic amine is preferably 30 parts by weight or more and 40 parts by weight or less, based on the total amount of the metalworking oil, where the entire metalworking oil is taken as 100 parts by weight. In this case, it is possible to achieve both excellent defoaming properties and processability, and to improve the liquid stability and rust prevention properties of the metalworking oil.

[0023] In addition to the above components, the metalworking oil may contain various additives, such as rust inhibitors, anticorrosive agents, flocculants, pH adjusters, etc., as needed, provided that the effects of the present invention are not impaired.

[0024] Examples of rust inhibitors include aliphatic monocarboxylic acids and dicarboxylic acids having 6 to 36 carbon atoms and their amides, alkenyl succinic acids having 6 to 36 carbon atoms and their amides, aromatic carboxylic acids, and benzotriazoles. Rust inhibitors may be used alone or in combination of two or more. When a rust inhibitor is contained, the content thereof may be, for example, 1 part by weight or more and 5 parts by weight or less, based on the total amount of the metalworking oil, where the entire metalworking oil is taken as 100 parts by weight.

[0025] Examples of corrosion inhibitors include phosphate esters, alkylphosphonic acids, and sodium metasilicate. One type of corrosion inhibitor may be used alone, or two or more types may be used in combination. When an inhibitor is contained, the content thereof may be, for example, 0.001 to 1 part by weight in total, based on the total amount of the metalworking oil, where the total amount of the metalworking oil is taken as 100 parts by weight.

[0026] Examples of the flocculant include polyacrylic acid ester-based flocculants and polyimine-based flocculants. The flocculants may be used alone or in combination of two or more. When a flocculant is contained, the content thereof may be, for example, 0.001 to 2 parts by weight in total, based on the total amount of the metalworking oil, where the entire metalworking oil is taken as 100 parts by weight.

[0027] Examples of pH adjusters include inorganic bases such as sodium hydroxide and potassium hydroxide, and organic bases such as triethylamine. pH adjusters may be used alone or in combination of two or more. When a pH adjuster is contained, the content may be, for example, 0.001 to 1 part by weight based on the total amount of the metalworking oil, where the entire metalworking oil is taken as 100 parts by weight.

[0028] In addition to the above-mentioned additives, the metalworking oil according to the embodiment may also contain antiseptics, antifungal agents, lubricants (surfactants, etc.), etc., as needed, within the range that does not impair the effects of the present invention. The content of each additive may be appropriately selected according to conventional techniques.

[0029] The metalworking oil according to the embodiment contains a specific combination of a fatty acid, water, and an amine, and thus can exhibit excellent processability as well as excellent defoaming properties, making it unnecessary to add an antifoaming agent for the purpose of defoaming other than the fatty acid, water, and amine.

[0030] The metalworking oil according to the embodiment is water-soluble and can be used as is for machining metal materials. Alternatively, the metalworking oil according to the embodiment can be used as a stock solution and further diluted with a diluent such as water to form a coolant, which can be used for machining metal materials.

[0031] When the metalworking oil according to the embodiment is diluted with a diluent for use, the dilution ratio may be adjusted as appropriate depending on the composition of the metalworking oil and the performance required during metalworking. When diluted for use, the dilution ratio is typically 1.5 to 100 times. From the viewpoint of further enhancing the effects of the present invention and improving processing characteristics, the dilution ratio is preferably 5 to 50 times, more preferably 5 to 30 times.

[0032] The pH of the metalworking oil according to the embodiment is preferably 8.5 or more and 9.8 or less, more preferably 8.7 or more and 9.5 or less, and even more preferably 9.0 or more and 9.3 or less.

[0033] When the metalworking oil according to the embodiment is diluted with water for use, the pH of the metalworking oil during use is preferably 8.0 or more and 9.3 or less, more preferably 8.5 or more and 9.0 or less. When the pH of the water-diluted solution of the metalworking oil is within the above range, spoilage of the water-diluted solution can be suppressed.

[0034] The metalworking oil of the embodiment is obtained by mixing the above components.

[0035] The metalworking oil according to the embodiment has excellent defoaming properties and processability, and can therefore be suitably used in various metal processing operations such as cutting, grinding, polishing, and cutting of metal materials. Examples of metals to be processed include iron-based metals and their alloys, stainless steel, aluminum, aluminum alloys, magnesium, magnesium alloys, copper, copper alloys, and other non-ferrous metals and their alloys.

[0036] (Metal processing method) In the metalworking method according to the embodiment of the present invention, a metal material is processed using the metalworking oil according to the embodiment described above. The metalworking method can be suitably used for various metalworking processes, such as cutting, grinding, polishing, and cutting. Examples of the types of metals to be processed include the metals described above. In the metalworking method according to the embodiment of the present invention, foaming of the metalworking oil is suppressed, enabling good processing.

[0037] The metalworking oil composition according to the embodiment contains neodecanoic acid, a straight-chain fatty acid, an organic amine, and water. From the viewpoint of achieving excellent defoaming properties and excellent processability, the metalworking oil composition according to the embodiment does not contain a straight-chain fatty acid as the fatty acid, but may contain neodecanoic acid. That is, the metalworking oil composition according to the embodiment contains neodecanoic acid, an organic amine, and water. [Example]

[0038] Examples of the present invention will be specifically described below, but the present invention is not limited to these examples.

[0039] 1. Preparation of Metalworking Fluid [Example 1] Octanoic acid (straight-chain fatty acid, 8 carbon atoms), neodecanoic acid (branched-chain fatty acid, 10 carbon atoms), water, organic amine, rust inhibitor, corrosion inhibitor, and flocculant shown in Table 1 below were weighed out to achieve the composition (in weight %) shown in the table, and mixed in a stirrer until uniform, yielding the metalworking fluid of Example 1. The blending ratio (weight ratio) of neodecanoic acid to octanoic acid, and the molar fraction of neodecanoic acid in all fatty acids are also shown in Table 1. The total number of moles of fatty acids used in each of the examples and comparative examples in Table 1 below is the same.

[0040] [Examples 2 to 3] Metalworking oils of Examples 2 and 3 were prepared in the same manner as in Example 1, except that nonanoic acid, which has 9 carbon atoms, was blended as the straight-chain fatty acid and the blending ratio of each component was as shown in Table 1. Table 1 also shows the blending ratio (weight ratio) of neodecanoic acid to nonanoic acid, and the molar fraction of neodecanoic acid in all fatty acids. [Examples 4 to 6] Metalworking oils of Examples 4 to 6 were prepared in the same manner as in Example 1, except that the blending ratios of the components were as shown in Table 1. Table 1 also shows the blending ratio (weight ratio) of neodecanoic acid to octanoic acid, and the molar fraction of neodecanoic acid in all fatty acids.

[0041] [Example 7] A metalworking oil of Example 7 was prepared in the same manner as in Example 1, except that only neodecanoic acid was blended as the fatty acid and the blending ratio of each component was as shown in Table 1.

[0042] [Comparative Example 1] The metalworking oil of Comparative Example 1 was prepared in the same manner as in Example 1, except that only octanoic acid (straight-chain fatty acid, carbon number 8) was blended as the fatty acid and the blending ratio of each component was as shown in Table 1.

[0043] Comparative Example 2 The metalworking oil of Comparative Example 2 was prepared in the same manner as in Example 1, except that only nonanoic acid (straight-chain fatty acid, carbon number 9) was blended as the fatty acid and the blending ratio of each component was as shown in Table 1.

[0044] Comparative Example 3 The metalworking oil of Comparative Example 3 was prepared in the same manner as in Example 1, except that only decanoic acid (straight-chain fatty acid, carbon number 10) was blended as the fatty acid and the blending ratio of each component was as shown in Table 1.

[0045] [Comparative Examples 4 to 6] Metalworking oils of Comparative Examples 4 to 6 were prepared in the same manner as in Example 1, except that nonanoic acid (straight-chain fatty acid, 9 carbon atoms) and isononanoic acid (branched-chain fatty acid, 9 carbon atoms) were blended as the fatty acids, and the blending ratios of each component were as shown in Table 1. The molar fraction of isononanoic acid in all fatty acids is also shown in Table 1.

[0046] Comparative Example 7 The metalworking oil of Comparative Example 7 was prepared in the same manner as in Example 1, except that only isononanoic acid (branched-chain fatty acid, carbon number 9) was blended as the fatty acid and the blending ratio of each component was as shown in Table 1.

[0047] [Comparative Examples 8 to 10] The metalworking oils of Comparative Examples 8 to 10 were prepared in the same manner as in Example 1, except that octanoic acid (straight-chain fatty acid, carbon number 8) and octylic acid (branched-chain fatty acid, carbon number 8) were blended as the fatty acids, and the blending ratios of each component were as shown in Table 1. The molar fraction of octylic acid in all fatty acids is also shown in Table 1.

[0048] [Comparative Examples 11 to 13] Metalworking oils of Comparative Examples 11 to 13 were prepared in the same manner as in Example 1, except that nonanoic acid (straight-chain fatty acid, carbon number 9) and octylic acid (branched-chain fatty acid, carbon number 8) were blended as the fatty acids, and the blending ratios of each component were as shown in Table 1. The molar fraction of octylic acid in all fatty acids is also shown in Table 1.

[0049] [Comparative Example 14] A metalworking oil agent of Comparative Example 14 was prepared in the same manner as in Example 1, except that only octylic acid (branched-chain fatty acid, carbon number 8) was blended as the fatty acid and the blending ratio of each component was as shown in Table 1.

[0050] [Table 1-1]

[0051] [Table 1-2]

[0052] 2.Performance evaluation [Evaluation of anti-foaming properties] The test liquids used were prepared by diluting the sample stock solutions in Table 1 above with water to 5% by weight. 300 g of each of the water-diluted solutions from the above Examples and Comparative Examples was placed in a mixer equipped with a graduated container and stirred at 10°C for 1 minute. After stirring was stopped, the amount of foam (ml) on the liquid surface was measured at predetermined time intervals to evaluate the defoaming ability. The smaller the amount of foam, the better the defoaming ability. The results are shown in Table 2 below.

[0053] [Evaluation of workability] The test fluid used was the sample stock solution in Table 1 diluted to 5% by weight with water. Using the following workpiece materials, tapping was performed under the following conditions, and the tapping torque (cutting resistance) experienced during tapping was measured to evaluate machinability. The smaller the torque value, the better the machinability. The results are shown in Table 2 below. Cutting tool: Roll tap (M4 x 0.7) Cutting material: AC4C Cutting speed: 5.0m / min Pilot hole: φ3.7mm Number of N: 5 (torque value evaluated as the average value of 5 holes)

[0054] [Table 2-1]

[0055] [Table 2-2]

[0056] FIG. 1 is a graph showing the relationship between the molar fraction of neodecanoic acid and the defoaming and processability based on Examples 1, 4 to 6, Example 7, and Comparative Example 1, all of which have the same number of carbon atoms in the straight-chain fatty acids. The horizontal axis of FIG. 1 represents the molar fraction of neodecanoic acid. The left vertical axis of FIG. 1 represents the torque value (N m), and the right vertical axis represents the foam volume after 5 minutes (ml). The solid line in FIG. 1 is a graph showing the relationship between the molar fraction of neodecanoic acid and the torque value. The dashed line in FIG. 1 is a graph showing the relationship between the molar fraction of neodecanoic acid and the foam volume. The direction indicated by the solid arrow in FIG. 1 represents the preferred direction for processability, and the direction indicated by the dashed arrow represents the preferred direction for defoaming.

[0057] Tables 1 and 2, as well as Figure 1, show that the examples containing neodecanoic acid, octanoic acid (straight-chain fatty acid), organic amine, and water have improved defoaming properties compared to the comparative examples containing no neodecanoic acid. It is also clear that the examples have improved processability compared to the comparative examples. That is, the examples have improved defoaming properties and processability compared to the comparative examples.

[0058] FIG. 2 is a graph showing the relationship between the molar fraction of neodecanoic acid and the defoaming properties and processability based on Examples 2, 3, and Comparative Example 2, all of which have the same number of carbon atoms in the straight-chain fatty acids. The horizontal axis of FIG. 2 is the molar fraction of neodecanoic acid. The left vertical axis of FIG. 2 is the torque value (N·m), and the right vertical axis is the foam volume (ml) after 5 minutes. The solid line in FIG. 2 is a graph showing the relationship between the molar fraction and the torque value. The dashed line in FIG. 2 is a graph showing the relationship between the molar fraction and the foam volume. The directions indicated by the solid and dashed arrows in FIG. 2 are the same as those in FIG. 1.

[0059] Tables 1 and 2, as well as Figure 2, show that the Examples containing neodecanoic acid, nonanoic acid (a straight-chain fatty acid), an organic amine, and water have improved defoaming properties compared to the Comparative Examples containing no neodecanoic acid. It can also be seen that the Examples have almost the same or improved processability compared to the Comparative Examples. That is, the Examples have improved defoaming properties and maintained or improved processability compared to the Comparative Examples.

[0060] The torque value was 0.59 N·m or less in the examples containing octanoic acid, and 0.55 N·m or less in the examples containing nonanoic acid. The straight-chain fatty acid preferably has 8 to 9 carbon atoms, and more preferably has 9 carbon atoms.

[0061] The ratio of neodecanoic acid to straight-chain fatty acid is preferably 1:0.1 to 1:5, more preferably 1:1 to 1:5 or 1:1.5 to 1:5, even more preferably 1:1.8 to 1:5, and most preferably 1:1.8 to 1:4.6.

[0062] FIG. 3 is a graph showing the relationship between the carbon number of the straight-chain fatty acid and the defoaming property and processability based on Comparative Examples 1 to 3. The horizontal axis of FIG. 3 is the carbon number of the straight-chain fatty acid. The left vertical axis of FIG. 3 is the torque value (N·m), and the right vertical axis is the foam volume (ml) after 10 minutes. The solid line in FIG. 3 is a graph showing the relationship between the carbon number and the torque value. The dashed line in FIG. 3 is a graph showing the relationship between the carbon number and the foam volume. The directions indicated by the solid and dashed arrows in FIG. 3 are the same as those in FIG. 1.

[0063] FIG. 4 is a graph showing the relationship between the molar fraction of isononanoic acid and the defoaming properties and processability based on Comparative Examples 2 and 4 to 7. The horizontal axis of FIG. 4 is the molar fraction of isononanoic acid. The left vertical axis of FIG. 4 is the torque value (N m), and the right vertical axis is the foam volume after 7 minutes (ml). The solid line in FIG. 4 is a graph showing the relationship between the molar fraction and the torque value. The dashed line in FIG. 4 is a graph showing the relationship between the molar fraction and the foam volume. The directions indicated by the solid and dashed arrows in FIG. 4 are the same as those in FIG. 1.

[0064] Tables 1 and 2, as well as Figure 3, show that in the comparative example containing straight-chain fatty acids but not containing neodecanoic acid, processability improved while defoaming performance decreased as the carbon number (hydrocarbon chain length) of the straight-chain fatty acids increased. Furthermore, Tables 1 and 2, as well as Figure 4, show that in the comparative example containing isononanoic acid and straight-chain fatty acids but not containing neodecanoic acid, processability improved while defoaming performance decreased as the molar fraction of isononanoic acid decreased. In other words, in the comparative example, there is a trade-off between processability and defoaming performance. This is presumably because the component contributing to lubrication (fatty acids) adsorbs to the metal surface and forms an adsorption film, thereby exhibiting processability, and also adsorbs to the air surface and forms an adsorption film, thereby stabilizing foam. As shown in Tables 1 and 2 and Figures 1 and 2, mixing straight-chain fatty acids with neodecanoic acid eliminated the trade-off between processability and defoaming performance, achieving both.

[0065] FIG. 5 is a graph showing the relationship between the molar fraction of octylic acid and the defoaming and processability based on Comparative Examples 8 to 10 and 14. FIG. 6 is a graph showing the relationship between the molar fraction of octylic acid and the defoaming and processability based on Comparative Examples 11 to 14. The horizontal axis in FIGS. 5 and 6 represents the molar fraction of octylic acid. The left vertical axis in FIG. 5 represents the torque value (N m), and the right vertical axis represents the foam volume (ml) after 5 minutes. The left vertical axis in FIG. 6 represents the torque value (N m), and the right vertical axis represents the foam volume (ml) after 10 minutes. The solid lines in FIGS. 5 and 6 represent the relationship between the molar fraction and the torque value. The dashed lines in FIGS. 5 and 6 represent the relationship between the molar fraction and the foam volume. The directions indicated by the solid and dashed arrows in FIGS. 5 and 6 are the same as those in FIG. 1.

[0066] Tables 1 and 2, as well as Figure 5, show that in the comparative example that does not contain neodecanoic acid but contains octylic acid and octanoic acid (straight-chain fatty acids), processability improves while antifoaming property decreases as the molar fraction of octylic acid decreases. Similarly, Tables 1 and 2, as well as Figure 6, show that in the comparative example that does not contain neodecanoic acid but contains octylic acid and nonanoic acid (straight-chain fatty acids), processability improves while antifoaming property decreases as the molar fraction of octylic acid decreases. In other words, in the comparative example that does not contain neodecanoic acid, there is a trade-off between processability and antifoaming property.

[0067] From Example 1, Example 4 and Comparative Example 8, it was found that in the Examples in which neodecanoic acid was added to the straight-chain fatty acid, it was possible to improve the defoaming property while suppressing the decrease in processability, compared to the Comparative Example in which octylic acid was added to the straight-chain fatty acid.

[0068] From Example 3, Comparative Example 4, and Comparative Example 11, it was found that in the Examples in which neodecanoic acid was added to the straight-chain fatty acid, it was possible to improve the defoaming property while suppressing the decrease in processability, compared to the Comparative Examples in which isononanoic acid or octylic acid was added to the straight-chain fatty acid.

[0069] From Tables 1 and 2 and FIG. 1, it can be seen that Example 7 containing neodecanoic acid, an organic amine, and water had superior defoaming properties and processability compared to the Comparative Example containing no neodecanoic acid.

[0070] From the above, it was confirmed that the metalworking oil agent of the present disclosure has excellent antifoaming properties and excellent processability.

[0071] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of the claims and the scope equivalent to the claims.

[0072] The matters described in each embodiment can be combined with each other. In addition, the independent claims and dependent claims described in the claims can be combined with each other in any combination, regardless of the reference format. Furthermore, although the claims use a format in which a claim references two or more other claims (multiple claim format), this is not limited to this format. A multiple claim (multi-multi claim) that references at least one other multiple claim may also be used.

Claims

1. Contains neodecanoic acid, octanoic acid, an organic amine and water, The total metalworking oil solution is 100 parts by weight, the content of the mixture of neodecanoic acid and octanoic acid is 5 parts by weight or more and 7 parts by weight or less, the content of the organic amine is 30 parts by weight or more and 40 parts by weight or less, The content of the water is 50 parts by weight or more and 60 parts by weight or less, The weight ratio of the neodecanoic acid to the octanoic acid is 1:0.1 to 1:

5. Metalworking oil.

2. The weight ratio of the neodecanoic acid to the octanoic acid is 1:0.2 to 1:3.

8. The metalworking oil according to claim 1.

3. pH is 8.5 to 9.8 The metalworking oil according to claim 1.

4. A metalworking method for working a metal material by using the metalworking oil according to any one of claims 1 to 3.

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