JP3121187B2 - Water-soluble processing oil for magnesium alloy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-soluble processing oil for a magnesium alloy, and more particularly, to a low risk of explosion due to hydrogen generated during the processing of a magnesium alloy.
In addition, the present invention relates to a water-soluble processing oil which is difficult to separate a diluent diluted with water, has excellent stability over a long period of time, and has the same lubricity as a conventional water-soluble processing oil.

[0002]

2. Description of the Related Art Generally, metal processing is performed by the following method. Use no lubricants, use water-insoluble lubricants, use water-soluble lubricants, but the above is limited to some work materials that can be processed without lubricants, and The use of water-soluble lubricants is becoming the mainstream because of the problems such as the danger of contamination, contamination around the machine, and the resulting deterioration of the working environment. Iron is by far the most common metal used in automobiles and the like, but in recent years, from the viewpoint of resource saving or the global environment, improvements in fuel efficiency and reduction of exhaust gas have been demanded in the field of automobiles. As a method, weight reduction of a vehicle body is being promoted. Specifically, research and development for shifting the body and each component from the conventional iron-made to aluminum-made have been advanced. However, further weight reduction has begun to be heard here, and magnesium alloys, which are lighter than aluminum, are in the spotlight.

[0003] However, magnesium dust has a risk of explosion, and magnesium reacts with water to generate hydrogen, and when fired, there is also a risk of explosion. Therefore, the processing of magnesium alloys is technically very difficult, and there is information that processing is currently being performed using water-soluble oils at some overseas factories, but the details are unknown, At present, there is no known safe and efficient processing method of magnesium alloy. In the processing of magnesium alloy as described above, there is a risk of dust explosion due to cutting chips floating in the air unless a lubricant is used, and like other metals if a water-insoluble lubricant is used, There is a risk of fire or work environment problems, and water-soluble lubricants, which are currently becoming the mainstream of lubricants, have the danger of explosion due to hydrogen generated in the case of magnesium alloys. Although there are problems depending on the method, the development of a water-soluble lubricant is urgently required in the processing of magnesium alloys in view of the needs of current users.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a compound which suppresses the reaction between magnesium and water is added to minimize the amount of generated hydrogen to reduce the risk of explosion due to hydrogen. Provided is a water-soluble processing oil agent for magnesium alloys, which has low water resistance, is difficult to separate a water diluent, can be used stably for a long period of time, and has excellent secondary performance such as rust prevention and defoaming properties. The purpose is to:

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have found that a sulfonate having a specific structure is excellent in corrosion resistance to a magnesium alloy and has a water-soluble processing oil agent. It has been found that the compounding of the compound has an effect of suppressing generation of hydrogen, and the present invention has been completed. That is, the water-soluble processing oil for a magnesium alloy according to the first invention is a magnesium alloy containing 20 to 60% by weight of the following sulfonate and 1 to 30% by weight of a nonionic surfactant, based on 100% by weight of the processing oil. A water-soluble processing oil for use in a sample solution obtained by diluting the processing oil 30-fold with water into 500 ml of a sample liquid specified in JIS H5203.
The amount of hydrogen generated when adding 1 g of a 2 magnesium alloy and stirring at room temperature for 60 minutes is 2 ml or less. [Sulfonate] sodium dinonylnaphthalenesulfonate , dibutylna
Potassium phthalene sulfonate, 1-butyl-3-hexyl
Magnesium lunaphthalenesulfonate, 1-pentyl-
Sodium 3-octylnaphthalenesulfonate
One or more selected. Further, the second invention is the first invention.
The sulfonate in the processing oil of the present invention is dinonyl naphtha
It is characterized by being sodium renesulfonate. Change
In the third invention, the processing oil agent of the first invention or the second invention is:
It is further characterized by containing 1 to 30% by weight of a fatty acid salt.

The sulfonate according to the first aspect itself strongly adsorbs on the surface of the magnesium alloy, thereby suppressing the generation of hydrogen due to the reaction between magnesium and water, and also inhibiting the reaction with oxygen to prevent corrosion. It is effective. Further, it is a component that prevents and stabilizes a diluent obtained by diluting a processing oil with water. Of these, sodium dinonylnaphthalenesulfonate is particularly preferred.

In addition, other sulfonates, for example, metal salts of sulfonated alkylnaphthalenes other than those described in claim 1, and sulfonated alkylnaphthalenes such as alkylbenzene and dinonylnaphthalene. Although it is obtained, a dialkyl sulfosuccinate salt, an alkyl sulfo acetate salt, a synthetic sulfonate such as an α-olefin sulfonate, and a sulfonic acid mixture of hydrocarbons by-produced when a petroleum fraction is purified by sulfuric acid. one or more selected from petroleum sulfonic acid salts obtained by neutralization with an alkaline component, 請
You may use together with the sulfonate of Claim 1 . Oil sul
Sodium salts are preferred as the fonates.

[0008] The compounding amount of the sulfonate according to claim 1 is
The total amount of the water-soluble processing oil for magnesium alloy of the present invention is 1
When the content is set to 00% by weight (the same applies to the standards for the amounts of other components), the content is in the range of 20 to 60% by weight. The amount is 2
If the amount is less than 0% by weight, the effect of suppressing the generation of hydrogen is not sufficient, and a diluting liquid which is a secondary performance of a processing oil (a water-soluble metal processing oil is usually diluted with water to about 5 to 6 to 200 to 300 times). Liquid stability) is inferior,
The anticorrosion effect on the magnesium alloy is also insufficient. On the other hand, if it exceeds 60% by weight, the secondary performance of the processing oil agent, such as rust prevention and defoaming, is undesirably reduced.

The above-mentioned "nonionic surfactant" is a component used in combination with the above sulfonate to improve the stability over time of the diluting solution and maintain the anticorrosion effect on the magnesium alloy for a long period of time. As the nonionic surfactant, there are various types such as an ether type, an ether ester type and an ester type, for example, polyoxyethylene dodecyl ether, polyoxyethylene octadecyl ether, polyoxyethylene oleyl ether, polyoxyethylene octyl. Ethers, alkyl and alkyl allyl polyoxyethylene ethers such as polyoxyethylene nonylphenyl ether, sorbitan trilaurate, sorbitan esters such as sorbitan tetraoleate, ethylene oxide adducts, and fatty acid alkanolamides such as coconut oil fatty acid diethanolamide Is mentioned. The compounding amount of the nonionic surfactant is 1 to 3
0% by weight. If the blending amount is less than 1% by weight, the liquid stability of the diluent, which is the secondary performance of the processing oil, is reduced.
If the amount exceeds 0% by weight, the defoaming property, which is the secondary performance of the processing oil, is reduced.

Further, by using the above “fatty acid salt” in combination with the above sulfonate, the emulsion stability of the diluent is improved, and the anticorrosion effect on the magnesium alloy is improved. As a fatty acid forming such a fatty acid salt, a synthetic or natural fatty acid having an alkyl group having about 8 to 24 carbon atoms can be used. Representative synthetic fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid, and the like. Natural fatty acids are obtained by hydrolyzing natural fats and oils such as coconut oil, linseed oil, cottonseed oil, castor oil, etc., and what are called coconut oil fatty acids, linseed oil fatty acids, etc. based on the names of the fats and oils can be used. . As the cation for forming the salt, alkanolamine, potassium, sodium and the like are used. The amount of the fatty acid salt is 1 to 30% by weight. When the amount is less than 1% by weight, the liquid stability of the diluent, which is the secondary performance of the processing oil, is reduced. On the other hand, when it exceeds 30% by weight, the defoaming property, which is the secondary performance of the processing oil, is reduced. Therefore, it is not preferable.

Further, the above components may be prepared by dispersing or dissolving the above components in a petroleum base oil. As such a base oil, one or more of mineral oil and petroleum solvents such as machine oil, turbine oil, spindle oil, light oil, kerosene, petrolatum and the like can be used. The amount of the base oil is preferably in the range of 0 to 90 % by weight, especially 20 to 80 % by weight. When the base oil is used in the above ratio, the resulting processing oil is excellent in machinability and liquid stability, which is preferable. The usage amount is 9
If it exceeds 0 % by weight, the stability of the liquid is significantly impaired, which is not preferable. The processing oil agent of the present invention is composed of the above essential components and optional components, and as other optional components, additives conventionally used for metal processing, for example, extreme pressure additives, antioxidants, non-ferrous metals Additives such as a metal anticorrosive, a thickener, a defoamer, a preservative, and a dispersant can be appropriately blended and used.

[0012]

The present invention will be specifically described below with reference to examples and comparative examples. (1) Production Method In order to produce the water-soluble processing oil agent for a magnesium alloy of the present invention, the respective components may be mixed according to a known method using a homomixer or the like. Examples and reference examples in which the sulfonate according to claim 1 is used alone, and another surfactant or a fatty acid salt is used in combination with the sulfonate, and examples and reference examples in which all of these three components are used. Tables 1 and 2 show the mixing ratio of each component. Table 3 shows the proportions of the comparative examples. The numerical values in each table indicate that the total amount of
It represents weight% when it is set to 0% by weight. In Table 3, * indicates that the numerical value is out of the range of limitation.

[0013]

[Table 1]

[0014]

[Table 2]

[0015]

[Table 3]

(2) Performance test In order to clarify the performance of the water-soluble processing oil agent for magnesium alloy of the present invention, the hydrogen generation amount and the stability of the diluent were tested by the following methods in the presence of magnesium alloy chips. did. The test was carried out twice immediately after the preparation of the processing oil and after 30 days in order to confirm the effect over time of the stability of the diluents of the examples. Table 4 shows the results of Examples and Reference Examples, and Table 5 shows the results of Comparative Examples. In Comparative Example 5 in Table 5, a commercially available water-soluble processing oil agent for aluminum alloys was used.

Hydrogen generation amount In a 500 ml Erlenmeyer flask, 500 ml of a sample solution diluted 30 times with water and 1 g of magnesium alloy chips (equivalent to MC2 specified in JIS H5203) dry-cut by milling were added. Hydrogen generated under stirring at room temperature was collected, and the amount of hydrogen generated in 60 minutes was measured. Stability of Diluent Into a 500 ml Erlenmeyer flask, 500 ml of a sample solution diluted 30 times with water and 10 g of magnesium alloy chips (equivalent to MC2 defined in JIS H5203) dry-cut by milling were added. Air was blown into the diluent with an air pump, and while the diluent and the chips were in sufficient contact, the stability of the diluent was visually evaluated.

[0018]

[Table 4]

[0019]

[Table 5]

According to the results of Tables 4 and 5, the effect to be differed by the type and amount of the sulfonate, Jinoni
In the example using 20% by weight or more of sodium lunaphthalenesulfonate, the amount of hydrogen generated immediately after preparing the water diluent was 2 ml.
The following shows that the amount of hydrogen generated by the processing oil agent of the present invention is very small. In contrast, dinonyl naphthalene
In Comparative Examples 1 to 3 containing no sodium sulfonate , all of them exceeded 30 ml, indicating that the amount of generated hydrogen was extremely large. In Comparative Example 4, in which the content of the sulfonate exceeds the upper limit, the hydrogen generation amount and the stability of the diluent shown in Table 5 are all good, but the rust prevention and defoaming properties are remarkably high. It was confirmed that it was inferior.

On the other hand, with respect to the stability of the diluent, each of the examples has good stability immediately after dilution.
Even after 0 days, the stability of the diluent is not impaired, indicating that the diluent using the processing oil of the present invention is stable for a long period of time. On the other hand, in Comparative Examples 1, 2, and 5 containing no sulfonate and Comparative Example 3 containing less than the lower limit, the processing oil and water were completely separated immediately after the diluent was prepared. Has been done. As described above, it can be seen that the processing oil agent of the present invention generates extremely little hydrogen during processing of a magnesium alloy, and also has excellent stability of a liquid diluted with water. It should be noted that the present invention is not limited to the specific embodiments described above, but can be variously modified within the scope of the present invention according to the purpose and application.

[0022]

According to the present invention, the use of the water-soluble processing oil for a magnesium alloy can suppress the generation of hydrogen due to the reaction between magnesium and water to a remarkably small amount. The danger of explosion due to this is low, and the magnesium alloy can be processed extremely safely. Further, the water diluent is hardly separated, can be used stably for a long period of time, and is excellent in secondary performance of the processing oil agent such as rust prevention and defoaming.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C10M 145: 26) C10N 10:02 10:04 30:14 40:20 40:24 (72) Inventor Hironobu Sekimoto Yokohama, Kanagawa Prefecture 2 Takara-cho, Kanagawa-ku Nissan Motor Co., Ltd. (56) References JP-B-46-28895 (JP, B1) JP-B-47-1023 (JP, B1) Toshio Sakurai, "Additives for Petroleum Products" Showa 49 August 10 Reprint Issued by Koshobo Co., Ltd. pp. 412-413 (58) Fields investigated (Int.Cl. ⁷ , DB name) C10M 169/04 C10M 135/10 C10M 129/40 C10M 145/26 C10N 40 : 20 C10N 40:24

Claims (3)

(57) [Claims] 1. A water-soluble processing oil for a magnesium alloy, comprising 20 to 60% by weight of the following sulfonate and 1 to 30% by weight of a nonionic surfactant, wherein the processing oil is 100% by weight. Magnesium alloy characterized in that the amount of hydrogen generated is 2 ml or less when 1 g of MC2 magnesium alloy specified in JIS H 5203 is added to 500 ml of a sample solution obtained by diluting an oil agent 30 times with water and stirred at room temperature for 60 minutes. For water-soluble processing oils. [Sulfonate] sodium dinonylnaphthalenesulfonate, potassium dibutylnaphthalenesulfonate , magneto 1-butyl-3-hexylnaphthalenesulfonate
Sodium, 1-pentyl-3-octylnaphthalenesulfonic acid nato
One or two or more selected from lium . 2. The method according to claim 1, wherein the sulfonate is dinonylnaphthalene.
2. Magnesium according to claim 1, which is sodium sulfonate.
Water-soluble processing oil for metal alloys. 3. A process according to claim 1 or 2 for magnesium alloys soluble working oil according to characterized in that it contains 1 to 30 wt% of the fatty acid salt.