JP2909725B2 - Water-soluble metal processing oil - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water-soluble metal working oil. More specifically, rolling oil, forging oil, pressing oil,
The present invention relates to metal working oils such as drawing oil, cutting oil, and grinding oil.

[0002]

2. Description of the Related Art In water-soluble metalworking oils, emulsion type oils obtained by emulsifying mineral oils, vegetable oils, animal oils, synthetic esters, etc. with surfactants and soluble type oils containing surfactants as the main component are diluted in water. Was being used. However, since these oils contain surfactants that emulsify and solubilize, the operating oil and sliding oil that are mixed in from the machine are emulsified, and deterioration and deterioration of the working fluid, the generation of sludge and machine stains occur. It was happening. Solution-type working fluids with good oil separation such as hydraulic oil and sliding oil mixed in have been developed.These oils have good oil separation, but they have better lubricity than emulsion type and soluble type. It has a drawback that it is scarce and inferior in processing performance.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a water-soluble metal working which has excellent lubricity such as extreme pressure and oiliness, good separability from mixed lubricating oil, and good rot resistance. Intended to provide oil.

[0004]

In view of the above problems, the inventors of the present invention have worked on a water-soluble metal working which is excellent in lubricity and has good lubricating oil separability of mixed working oil and sliding oil. As a result of intensive studies on oils, they have found that a combination of a water-soluble polyether and benzothiazoles has excellent lubricity and good oil separation from hydraulic oils, sliding oils, etc. That is, the present invention provides a water-soluble polyether (A)
And a compound (B) having a benzothiazole ring, which is a water-soluble metal-working oil.

[0005]

[In the formula, R ² is a residue obtained by removing a hydroxyl group from a 1- to 6-valent alcohol, R ³ is a hydrogen atom or a hydrocarbon group having 1 to 6 carbon atoms, p is an integer of 10 to 100, and A ² is 3 carbon atoms. to 4 alkylene group, q is 0 or 1 to 100 integer, k is an integer of 1 to _{6, {(CH 2 CH 2 O} ) p / (a 2 O) q} may be either block addition random addition. ]

A ² O in the general formula (2) has 3 to 4 carbon atoms.
Examples of the alkylene oxides (propylene oxide, butylene oxide, etc.) may be used, and two or more of these may be used in combination (random co-addition polymerization, block co-addition polymerization).
Of these, preferred is propylene oxide. In the formula, m and n are 10 to 100, preferably 20 to 50.

The method for producing the water-soluble polyether (A) is not particularly limited, and as a catalyst, an alkali metal catalyst such as NaOH or KOH, an amine catalyst such as dimethylbenzylamine, or an acid catalyst such as BF3 is used to react with the above alcohols. Obtained by reacting an alkylene oxide.
The reaction temperature is usually 30 to 200° C., preferably 80 to 18
It is 0°C. The reaction time is usually 1 to 15 hours, preferably 3 to 8 hours.

In the present invention, examples of the compound (B) having a benzothiazole ring include compounds represented by the following general formula (1).

[0009]

[Chemical 2]

[In the formula, R ₁ represents a hydrogen atom or a carbon number of 1 to
8 alkyl groups, A ¹ is an alkylene group having 2 to 4 carbon atoms,
m is 0 or an integer of 1 to 20, M is an alkali metal hydrogen atom when m is 0, and a hydrogen atom when m is 1 to 20. ]

In the general formula (1), R ¹ is hydrogen or an alkyl group having 1 to 8 carbon atoms, and is a methyl, ethyl, propyl, butyl, pentyl, hexyl or octyl group.
Of these, preferred is hydrogen or a methyl group. If the carbon number of R ¹ exceeds 8, bubbles tend to occur. A ¹ O
Is an alkylene oxide having 2 to 4 carbon atoms (ethylene oxide, propylene oxide, butylene oxide, etc.), and a combination of two or more of these (random co-addition polymerization,
Block co-addition polymerization). Among these, preferred is ethylene oxide. M in the formula is 1 to 20
And preferably 5 to 15. In the formula, M is an alkali metal or hydrogen atom when m is 0, and m is 1
When it is -20, it is a hydrogen atom. Specific compounds represented by the general formula (1) include mercaptobenzothiazole,
Alkyl mercaptobenzothiazoles and their alkylene oxide adducts are mentioned.

The alkylene oxide adduct of the compound (B) can be obtained by using an alkali catalyst such as NaOH or KOH to produce EO, PO,
It can be obtained by adding BO or a mixture thereof.

The composition of the present invention may contain optional components such as conventional rust preventives, extreme pressure additives, oiliness improvers and defoamers.

Examples of the rust preventive agent include organic amines (monoethanolamine, triethanolamine, morpholine, cyclohexylamine, N-dimethylaminoethanolamine, isopropanolamine, butylamine,
Octylamine, laurylamine, oleylamine, stearylamine, etc.); organic amine derivatives (such as alkylene oxide adducts of the above amines) and aliphatic carboxylic acids (caprylic acid, lauric acid, nonanoic acid, decanoic acid,
Oleic acid); dibasic acid (azelaic acid, sebacic acid, dodecane diacid, dimer acid, etc.); aromatic carboxylic acid (benzoic acid, p-tert.butylbenzoic acid, nitrobenzoic acid, etc.); alkenylsuccinic acid ( Octenyl succinic acid,
Amine salts such as dodecenyl succinic acid and pentadecenyl succinic acid) or alkali metal salts; cyclohexylamine nitrite, benzotriazole and the like. Examples of the extreme pressure agent include amines such as sulfurized oleic acid, chlorinated stearic acid, alkyl phosphates, alkylthiopropionic acid, alkylthioglycolic acid, and alkali metal salts. As an oiliness improver,
The above-mentioned aliphatic carboxylic acids, alkenyl succinic acids and their amide compounds can be mentioned. Examples of the defoaming agent include silicon-based defoaming agents.

The content of the water-soluble polyether (A) in the water-soluble metalworking oil of the present invention is 10 to 80% by weight, preferably 20 to 50% by weight. The content of the compound (B) in the processing oil is 1 to 20% by weight, preferably 2 to 10%.
% By weight.

When the processing oil of the present invention is used, it is usually diluted with water to an appropriate concentration and used as a processing liquid.

[0017]

The present invention will be described in detail with reference to the following examples, but the present invention is not limited thereto. In the examples,% means% by weight.

Examples 1 to 7 and Comparative Examples 1 to 3 According to Table 1, the respective components were mixed in any order, and the mixture was heated to 60°
The processed oil agent of the present invention and a comparative processed oil agent were prepared by stirring and dissolving below.

[0019]

[Table 1] Note 1) EO/PO is a random copolymer of ethylene oxide and propylene oxide. EO/PO is a block copolymer of ethylene oxide and propylene oxide. The value in parentheses is the weight ratio of EO and PO. MW represents molecular weight. PEG1000 represents polyethylene glycol, MW.1000.

Table 2 shows the results of evaluation of various performances by preparing working fluids using the working oil agent of the present invention and the comparative oil agent shown in Table 1, respectively.

[0021]

[Table 2]

The performance evaluation method is as follows. Preparation of processing liquid: Various processing oils were diluted 50 times with tap water. Oil Separability: 95 cc of the working fluid and 5 cc of lubricating oil were stirred in the mixer for 1 minute (6000 rpm), transferred to a 100 cc measuring cylinder, and the oil separation amount (cc) after 2 hours was measured. Rot resistance: Put 100cc of working fluid in a 200cc bottle
After adding 3 g of corn powder, 5 g of cast iron cutting powder, and 1 cc of rotting cutting fluid thereto, the mixture was allowed to stand in a 37° C. thermostat and the number of general bacteria was measured 14 days later. Abrasion mark and friction coefficient: Using a vibration friction wear tester (manufactured by Optimol), load 200 N, frequency 50 Hz, amplitude 2
mm, measured for 10 minutes. As for the wear mark, the wear diameter of a steel ball (SUJ-2) having a diameter of 10 mm was measured.

[0023]

INDUSTRIAL APPLICABILITY The water-soluble metalworking oil of the present invention is excellent in lubricity, has a good separability of the lubricating oil mixed therein, and has a rot resistance. It is extremely suitable as oil, forging oil, pressing oil, drawing oil, cutting oil, and grinding oil.

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Claims (4)

(57) [Claims] 1. A water-soluble polyether (A) and one of the following:
A water-soluble metal-working oil comprising a compound (B) having a benzothiazole ring represented by the general formula (1) . [Chemical 1] [In the formula, R ₁ is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, A ¹ is an alkylene group having 2 to 4 carbon atoms, m is 0 or an integer of 1 to 20, and M is an alkali when m is 0. A metal hydrogen atom, and a hydrogen atom when m is 1 to 20. ] 2. The polyether (A) is a compound represented by the following general formula (2): The water-soluble metal-working oil described. R ² [O-{(CH ₂ CH ₂ O)p/(A ² O)q}-R ³ ]k (2) [In the formula, R ² is a residue obtained by removing a hydroxyl group from a mono- to hexavalent alcohol, R ³ is a hydrogen atom or a hydrocarbon group having 1 to 6 carbon atoms, p is an integer of 10 to 100, A ² is an alkylene group having 3 to 4 carbon atoms, q is 0 or an integer of 1 to 100, and k is 1
The integer of 6, {(CH ₂ CH ₂ O)p/(A ² O)q}, may be randomly added or block added. ] 3. The content of (A) is 10 to 80% by weight,
The content of (B) is 0.5 to 20 wt% claim 1 also
Is the water-soluble metalworking oil according to 2. 4. A cutting oil or a grinding oil.
3. The water-soluble metal working oil according to any one of 3 above.