JPH0488097A - Metal-processing oil - Google Patents

Abstract

PURPOSE:To obtain metal-processing oil used for metal processing such as machining, grinding, drawing and wire drawing having excellent machinability, resistance to putrefaction and resistance to deterioration without odor containing specific amounts of a specific dicarboxylic acid (salt) and a sulfur-based extremepressure agent. CONSTITUTION:The aimed processing oil contains 1-40wt.%, preferably 3-35wt.% dicarboxylic acid expressed by the formula (R1 is COOH or H; R2 is H for R1 is COOH or R2 is COOH for R1 is H), amine salt of said acid or alkali metallic salt of said acid and 1-30wt.%, preferably 5-20wt.% sulfur-based extreme-pressure agent (preferably tertiary dodecyl polysulfide or di-tertiary nonyl polysulfide, etc.).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a metal working oil, and more specifically, a metal working oil containing a special dicarboxylic acid, an amine salt thereof, or an alkali metal salt thereof, and a sulfur-based extreme pressure agent. This invention relates to metalworking oils used in metalworking such as cutting, grinding, -drawing, and wire drawing.

[Conventional technology and its problems]

Oils used for metal processing such as cutting, grinding, drawing, wire drawing, and pressing are generally animal and vegetable oils, mineral oils, synthetic oils, or mixtures thereof, or water, oiliness improvers,
It is used as it is or as a 1 to 30% emulsion or aqueous solution with the addition of extreme pressure additives, rust preventives, surfactants, preservatives, antioxidants, etc. In recent years, processing conditions have become increasingly harsh, such as the increase in size and precision of various processing machines, the increase in the hardness of metal materials, the increase in processing speeds and pressures, and the precision of finished surfaces of products. Conventional processing oils are no longer suitable for use under these harsh conditions, and the addition of chlorine- and sulfur-containing extreme pressure agents has become essential.

However, in recent years, concerns about the toxicity and carcinogenicity of organochlorine compounds have increased significantly.

Additionally, due to increasing environmental concerns, non-chlorine-based oils have come to be considered desirable.

However, the non-chlorine oils currently being developed and marketed (e.g., JIS W1 class 1, W2 class 1) do not contain extreme pressure agents, so they cannot be used in plastic processing such as high-speed, heavy cutting or drawing. is not enough. JP-A-61-181896
The issue is a water-soluble cutting oil containing polysaloids, JP-A-58
-149997 and JP-A-60-139791 disclose amine salts of monoesters such as polyoxypropylene glycol, polyoxyethylene glycol or polyoxypropylene adducts of dicarboxylic acids represented by the above general formula (I); Although water-soluble cutting oils containing alkali metal salts have been disclosed, they are still unsatisfactory in terms of accuracy and tool life in high-speed, heavy-duty cutting.

In addition, as non-chlorine lubricating additives, reaction products of organic amines and organic phosphate esters or organic phosphite esters (U.S. Pat. No. 3,553,131), dihydrocarbyl phosphites having 1 to G carbon atoms, and Reaction products with alkoxylamines or vicinal diols, or with boron compounds (diboron trioxide, boric acid, metaborates, alkyl borates, etc.) (U.S. Pat. No. 4.529)
No. 528, No. 4,557,845, No. 4,557.8
No. 45, No. 4.555,353, No. 4532.05
No. 7, No. 4,522,629) and the like have been disclosed, but as additives for metal working oils, the extreme pressure properties are insufficient. JP-A-1-308495 discloses reaction products of alkoxylated amines and organic phosphites, and reaction products between alkoxylated amines, organic phosphites, and boron-containing compounds (diboron trioxide, metabore 1, and organic boron compounds). Although some methods have been disclosed, their improvement effects are still not satisfactory, and further improvements have been strongly desired.

[Means for solving problems]

In view of the above-mentioned current situation, the inventors of the present invention have conducted extensive studies to find a metalworking oil that not only has excellent machinability, grindability, and plastic workability, but also has excellent corrosion resistance, deterioration resistance, and antifoaming properties. A metal working oil containing 1 to 40% by weight of a dicarboxylic acid represented by the following general formula (I) or an amine salt thereof or an alkali metal salt thereof and 1 to 30% by weight of a sulfur-based extreme pressure agent is used for the above purpose. It has been found to be a very suitable compound for use.

(However, R1 is C0011 or H, and R8 is C0011 or H.
When 00I+, R2 is H, and when R1 is H, R
It is assumed that 2 is COO11. ) The dicarboxylic acid represented by the above general formula (I) or its alkali metal salt or its amine salt can be added to mineral oil and/or synthetic oil together with additives such as sulfur-based extreme pressure agents, oiliness agents, and rust preventive agents. As a water-insoluble metal working oil, or in water or mineral oil and/or synthetic oil, sulfur-based extreme pressure agents, surfactants,
In addition to rust preventives, preservatives, etc., it can also be used as an emulsion type or soluble type metal working oil composition using conventional means. At this time, the effective ratio of these additions is appropriately selected depending on the type of concomitant product, purpose of use, usage conditions, etc.

Examples of the alkali metal of the alkali metal salt of the dicarboxylic acid represented by the above general formula (I) or its amine salt include lithium, sodium, potassium, etc.
Lithium or potassium is practical, and as the amine forming the amine salt, various amine compounds conventionally used as amine salts in water-soluble cutting fluids can be used. Examples of the amine compounds include alkyl amines such as tributylamine, 2-ethylhexylamine, stearylamine, and dimethylstearylamine, ethylene oxide adducts of these alkylamines, jetanolamine, triethanolamine, diisopropanolamine, etc. Examples include alkanolamines, dicyclohexylamine, morpholine, N-aminopropylmorpholine, etc., and alkanolamines are particularly effective.

The amount of the alkali metal salt of dicarboxylic acid represented by the above general formula (I) or its amine salt is 1 to 40% by weight, preferably 3 to 35% by weight.

The alkali metal salt or amine salt of the dicarboxylic acid represented by the above general formula (I) can be easily produced by adding the alkali metal hydroxide or amine in a somewhat excess amount than the neutralization equivalent, and can be used to prevent rust. It is also preferable in terms of properties and deterioration resistance.

Examples of the sulfur-based extreme pressure agent used in the present invention include sulfurized oils and fats (sulfurized rapeseed oil, sulfurized lard, sulfurized synthetic pine kola oil, etc.);
Polysulfides (dibenzyl disulfide, dibenzyl disulfide, dihenzyl octasulfide, ditertiary dodecyl polysulfide, ditertiary nonyl polysulfide, dihexadecyl polysulfide, esters of jetanol disulfide and fatty acids, etc.), thiocarbonates ( Xanthogen disulfide, xane 1 hegente 1~
rasulfide, glycol ester of gysanthic acid, etc.), and more preferably polysulfides, ie, di-tertiary dodecyl polysulfide, di-tertiary nonyl polysulfide, etc.

The blending amount of the sulfur-based extreme pressure agent is 1 to 30% by weight, preferably 5 to 20% by weight.

Mineral oils used in the present invention include refined mineral oils such as machine oil and turbine oil, and synthetic oils include synthetic hydrocarbon oils such as poly-alphaolefin oil and polybencdiene oil, fatty acid pentaerythritol esters, and dioctyl oils. Examples include ester oils such as sebacate, polyether polyols, and the like.

The rust inhibitors used in the present invention include calcium salts of petroleum sulfonic acids, barium salts of petroleum sulfonic acids, sodium salts of petroleum sulfonic acids, sorbitan monooleate-1,
Lanolin, oxidized wax, calcium salt of oxidized wax, barium salt of oxidized wax, sodium salt of oxidized wax, alkoxyphenylamine, dicyclohexylamine, pentaerythritol monoester, alkanolamine, alkylimidacillin, oleylsarcosine, oleylamine oleate etc.

The surfactants used in the present invention include potassium petroleum sulfonic acid soap, sodium petroleum sulfonic acid soap, alkyl sulfamide carboxylate, octylphenol ethoxylate, nonylphenol ethoxylate, alcohol having 12 to 18 carbon atoms. E1 ~ xylate,
2:1 diethanolamine fatty acid amide and the like.

〔Example〕

Next, the present invention will be specifically explained using Examples and Comparative Examples. However, the present invention is not limited in any way by the following examples.

Example 1 Water-insoluble cutting oils having the compositions shown in Table 1 below were manufactured, and the load wear index <
LWI) (ASTM I)-2783) tests were conducted and the results are shown in Table 1.

Note that the amounts added in the table represent parts by weight unless otherwise specified.

Example 2 Emulsion-type grinding cutting oils having the compositions shown in Table 3 below were manufactured and tested using a Soda pendulum oil test mN2 model.
Coefficient of friction at 5°C, putrid odor after being left for 7 days, cutting chips from dry cutting of castings were immersed in emulsion-type cutting and grinding oil with the composition shown in Table 3 for 24 hours, then the liquid was drained and placed in a petri dish. Rust prevention was measured by observing the rusting state after a period of time.

The machinability test was performed using a drill press machine with an I-lux value of 10K.
The number of holes forming W was measured and evaluated. The cutting conditions are shown in Table 2, and the results are shown in Table 3.

Table 2 Example 3 Soluble cutting oils having the compositions shown in Table 4 below were manufactured, and tested using a Soda pendulum type oil tester N2 type.
The friction coefficient at °C and the machinability test similar to Example 2 were conducted, and the results are shown in Table 3.

In addition, DIPA salt in Table 4 indicates diisopropanolamine salt, and TEA salt indicates triethanolamine salt.

〔Effect of the invention〕

As exemplified above, by using a dicarboxylic acid, its amine salt, or its alkali metal salt and a sulfur-based extreme pressure agent, it not only has excellent machinability but also has no odor and is highly resistant to putrefaction and deterioration. It is possible to provide a non-chlorine based metal working oil.

Claims (1)

[Scope of Claims] A metalworking oil containing 1 to 40% by weight of a dicarboxylic acid represented by the following general formula (I) or its amine salt or its alkali metal salt and 1 to 30% by weight of a sulfur-based extreme pressure agent. . ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (I) (However, R_1 is COOH or H, and when R_1 is COOH, R_2 is H, and when R_1 is H, R_2 is COOH. .)