JPS6025080B2 - metal working oil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emulsion-type metalworking oil that is non-corrosive and has a long life.

BACKGROUND ART Conventionally, as a method of preventing metalworking oil from spoiling, a disinfectant, particularly an organic disinfectant, has been added to the metalworking oil.

However, although this organic disinfectant has a good anti-corrosion effect against certain microorganisms, it may not be sufficiently effective depending on the type of microorganism. Therefore, it was necessary to select an appropriate disinfectant for use. moreover,
Some organic disinfectants are themselves decomposed by microorganisms, and their anti-septic effects necessarily last only for a short period of time, so it is necessary to add the disinfectant frequently. However, it had the disadvantage of requiring a lot of effort and cost. Another sterilization method is to heat metalworking oil that has been used for a predetermined period of time to a relatively high temperature to sterilize the anaerobic bacteria in the metalworking oil, and to replenish various additives that have disappeared through this process. is also known. However, like the above method, this method also requires a large amount of cost and is difficult to obtain sufficient effects. The present inventor has already proposed a method for preventing rot by bringing metal working oil into contact with metal cobalt (Japanese Patent Publication No. 51039), but this method requires specific equipment to implement. The inventor of the present invention continued his research and found that such problems could be solved and that an excellent sterilizing effect could be obtained with a simple means, thereby completing the present invention.

The present invention is based on the general formula (where RI represents an alkyl group and m+n is 3 to 24).

), a compound represented by the general formula (wherein R2 to R5 represent an alkyl group or an aryl group, and R2 to R5 may be the same or different.

) and a nutritious oil. The following general formula (1) used in the present invention (wherein, RI represents an alkyl group, and m+n is 3 to 24.

The compound represented by ) is a polyoxyethylene alkylamine, and the alkyl group preferably has 8 to 20 carbon atoms.

Also, in the above pair history formula (1), the sum of m and n is 3
-24, and m and n are preferably 2-8, particularly preferably 2-5. Preferred examples of the compound represented by general formula (1) are shown below. (CH2CH20>2HC, 2 days 25N (CH2CH20>2 days (CH2CH20>5HC, 2 days 25N (CH2CH20) 5 days (CH2CH20) 8HC, 2 days 25N (CH2CH20) 8 days, then the following general formula (RO) ) (In the formula, R2 to R5 represent an alkyl group or an aryl group, and R2 to R5 may be the same or different.

The compound represented by ) is zinc dithiophosphate, and the alkyl group is not particularly limited, but those having 3 to 12 carbon atoms are preferred.

Further, there are no restrictions on the aryl group, and a counterfeit aryl group is also included, and the substituent in this case is preferably an alkyl group. Specific examples of the compound of the above one-stage formula (0) include those in which R2 to R5 are mainly composed of secondary hexyl groups, and compounds in which R2 to R5 are mainly composed of secondary alkyl groups having 5 or less carbon atoms. , those consisting of a mixture of an isobutyl group and n-amyl group, those consisting of an isoamyl group as a main component, and those consisting of an alkylaryl group as a main component. The general formula (
Two or more of the compounds 1) and (0) can also be used in combination. The present invention is an emulsion-type metalworking oil containing the compounds represented by the general formulas (1) and (0) as main components and a paraffinic, naphthenic, or other natural oil.

Examples of emulsion type metalworking oils include cutting oils and rolling oils. If necessary, other anions may be added to the main component.
Appropriate dilution ratio at the time of use for the metal working oil stock solution containing nonionic surfactants, other emulsifying aids, anti-mirroring agents, stabilizers, etc., generally 5 to 10 pm, usually 10 to 10 pm. 5
It is diluted to 0 times with water, stored in a tank, etc., and used by circulating between the tank and the equipment used. The above-mentioned polyoxyethylene alkylamines represented by general formula (1) and zinc dithiophosphates represented by general formula (0) may be blended at an appropriate time before or after diluting the metalworking oil with water. .

The compounding amount is 3% to 3% by weight, preferably 3% to 3% by weight of compounds 2 to 4 of the general formula (1) as a stock solution, and the amount of the compound of the general formula (0
), preferably 3 to 2% by weight of the compound
The key oil is 30-9% by weight, preferably 40-8% by weight. Additionally, other commonly used additives can be added to the metalworking oil as needed, such as nonionic additives such as sodium lauryl sulfate, sorbitan monolaurate, polyoxyethylene alkyl ether, polyoxyethylene nonylphenyl ether, etc. Surfactants, extreme pressure additives such as chlorinated paraffin, dibenzyl disulfide, tricresyl phosphate, etc. can be added as appropriate.

The metalworking oil of the present invention has a corrosion-preventing effect not limited to specific microorganisms, but inhibits the growth of a wide variety of microorganisms, is free from spoilage, and has a long life.

Furthermore, there is no environmental pollution due to the generation of bad odors, and it is highly safe for the human body. Furthermore, since it is possible to directly blend the compounds of general formulas (1) and (0) as a metal working oil stock solution, no special equipment is required. Therefore, the present invention is extremely useful in the field of metal processing. Next, the present invention will be explained in more detail with reference to Examples.

Examples 1 to 6 and Comparative Examples 1 to 5 An emulsion type metal working oil stock solution was prepared by blending the compounds shown in Table 1 with fresh mineral oil in a predetermined ratio.

The metal working oil obtained in this way was added to 3M with tap water.
After dilution, 20' of the solution was collected into a test tube. Next, 200 pieces of sapling chips and 1 drop of putrid oil were added to this test tube, and static culture was performed at 30°C for 10 days. Incidentally, sickle chips are mixed into metal working oil during metal working. When measuring the number of viable bacteria during culture, the following culture medium and culture method were used for each bacteria.

(11 aerobic bacteria (agar plate method, broth) medium composition:
Meat extract 0.5%, beptone 1.0%, sodium chloride 0.5%, agar 1.5% (7.0%) '2' anaerobic bacteria (roll tube method using VL basic culture etc.) Geological composition:
Beptone 1.0%, yeast extract 0.5%, heart extract 0.14%, glucose 0.2%, potassium dihydrogen phosphate 0.045%, potassium monohydrogen phosphate 0.045%, ammonium sulfate 0. 0.09%, sodium chloride 0.09%, magnesium sulfate (anhydrous salt) 0.009%, calcium chloride (anhydrous salt) 0.09%, agar 1.5%, cysteine hydrochloride 0.
03%, sodium hydroxide 0.4% (pH 7.0) (3
} Sulfate-reducing bacteria (roll tube method) Starkey medium [
American Type Culture Collection No. 12
Edition, p. 331 (1976)] with 1.5% agar added.

Table 1 shows the measurement results of the number of viable bacteria when each additive was added. Note that anaerobic bacteria and sulfate-reducing bacteria particularly affect the spoilage of metalworking oil. Female ship*7: Zinc dithiophosphate whose main component is R2 to R5 or a secondary alkyl group having 6 carbon atoms. Made by Nippon Lubrizo ■, product name: LubrizoZ677*8:
The number of viable bacteria upon addition of putrid oil is as follows.

Aerobic bacteria 2.0 x 105 pieces/shape Anaerobic bacteria 1.
1 x 104 pieces/rudder sulfate reducing bacteria 5.3 x 102 pieces/ground

Claims (1)

[Claims] 1 General formula ▲ Numerical formula, chemical formula, table, etc. ▼ (In the formula, R^1 represents an alkyl group, m+n is 3 to 24
It is. ), there are compounds represented by the general formula ▲ mathematical formulas, chemical formulas, tables, etc. An emulsion-type metalworking oil containing a compound represented by (2) and mineral oil.