JP3967692B2 - Lubricant for metal processing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyether metal processing lubricant.
[0002]
[Prior art]
Cutting oil, sliding surface lubricating oil, rolling oil, drawing oil, press oil, forging oil, metal working oil used for grinding and cutting of aluminum disks and silicon wafers are water-soluble, low-foaming, lubricating and Oil separation is required. As conventional water-soluble polyether-based metal processing lubricants, oxyethylene (hereinafter abbreviated as EO) units are introduced to impart water solubility, and the molecular weight is increased to 2,000 or more in order to satisfy lubricity. Polyethers are used. However, when the molecular weight of the polyether is increased, foaming easily occurs. Therefore, a metalworking oil in which propylene oxide (hereinafter abbreviated as PO) is further added to the ethylene oxide adduct in order to suppress the foam has been proposed. (For example, patent document 1). In addition, in order to improve wastewater treatment, EO and PO are randomly added to polyhydric alcohol, PO is further block-added, EO adduct of alcohol, and alkylene oxide having 3 to 4 carbon atoms to polyhydric alcohol. There has been proposed a lubricant using a combination of the above (for example, Patent Document 2).
[0003]
[Patent Document 1]
JP-A-8-231977
[Patent Document 2]
JP 58-145791 A
[0004]
[Problems to be solved by the invention]
However, these processing oils have a problem of insufficient lubricity and poor separation from oils such as sliding surface oil mixed therein.
An object of the present invention is to provide a lubricant for metal working that is excellent in lubricity, low foaming property and oil separation property.
[0005]
[Means for Solving the Problems]
  As a result of intensive studies in view of the above problems, the present inventors have reached the present invention.
  That is, the present invention is a polyether (A) represented by the following general formula (1), having an HLB of 8.5 or more and a weight average molecular weight of 1,000 to 10,000. C8-12 aliphatic monocarboxylic acid and / or dicarboxylic acid (B), And a polyalkylene polyamine (C 4-18, N atom content 3-6) propylene oxide adduct (C)1 to 400 parts by weight of (B) with respect to 100 parts by weight of (A), (C) is 1 to 40 parts by weightA metal working lubricant;
[0006]
[Chemical 3]
[0007]
[Wherein R¹Is a residue obtained by removing q OH groups from a C 1-8 valent aliphatic alcohol; R²Is H or an alkyl group having 1 to 8 carbon atoms; A¹And A²Is one or more alkylene groups having 3 or 4 carbon atoms; k is 0 or an integer of 1 or more; m and n are integers of 1 or more; and m + n is 10 or more; p is an integer of 1 or more; An integer from 1 to 8;
[0008]
[Formula 4]
[0009]
Represents a randomly bonded (poly) oxyethylene / (poly) oxypropylene chain; q k, m, n, p and R when q is 2-8²May be the same or different. ]
And it is a metal processing composition which consists of 1 or more types of additives chosen from the group which consists of said lubrication agent, antioxidant, extreme pressure additive, a rust preventive agent, and an antifoamer.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the general formula (1), R1 is a residue obtained by removing q OH groups from a C1-C8 aliphatic alcohol, for example, a linear or branched chain which may have an ether bond. A q-valent aliphatic hydrocarbon group may be mentioned. R¹If the number of carbons exceeds 8, the water solubility of (A) will deteriorate. Preferably, it is a residue obtained by removing q OH groups from an aliphatic alcohol having 1 to 6 carbon atoms.
q is an integer of 1-8. The value of q is preferably 1 to 3, more preferably 1 to 2. When q exceeds 8, the viscosity of (A) becomes too high and it becomes difficult to use.
R¹Among the q-valent aliphatic hydrocarbon groups, a monovalent aliphatic hydrocarbon group corresponds to a residue obtained by removing an OH group from a monovalent aliphatic alcohol, and an alkyl group having 1 to 8 carbon atoms (for example, Methyl group, ethyl group, n- and iso-propyl group, n-, iso-, sec- and tert-butyl group, pentyl group, hexyl group, pentyl group, octyl group, etc.), cis- or trans-unsaturation Hydrocarbon groups (alkenyl or alkynyl groups such as ethenyl, 1-, 2- and iso-propenyl, butenyl, pentynyl, hexenyl, octenyl and propynyl; and alkapolyenyl such as Butadienyl group).
[0011]
The divalent aliphatic hydrocarbon group includes a methylene group and a residue obtained by removing two OH groups from an aliphatic diol having 2 to 8 carbon atoms.
Aliphatic diols include saturated aliphatic diols (alkane diols such as ethylene glycol, propylene glycol, 1,4- and 1,2-butanediol, neopentyl glycol, 1,6-hexanediol, 1,2- and 1 , 8-octanediol, 3-methyl-1,5-pentanediol, 2,2,4-trimethyl-1,3-pentanediol, 2,2-dimethyl-1,3-propanediol and 2,5-dimethyl Hexane-2,5-diol), as well as unsaturated aliphatic diols (alkene diols such as 2-butene-1,4-diol, 3-methyl-3-butene-1,2-diol).
[0012]
Examples of the trivalent aliphatic hydrocarbon group include a residue obtained by removing three OH groups from an aliphatic triol.
Aliphatic triols include saturated aliphatic triols (alkanetriols such as glycerin, 1,2,3-butanetriol, 1,2,3-pentanetriol, 2-methyl-1,2,3-propanetriol, 2- Methyl-2,3,4-butanetriol, 2-ethyl-1,2,3-butanetriol, 2,3,4-pentanetriol, 2,3,4-hexanetriol, 2,4-dimethyl-2, 3,4-pentanetriol, pentamethylglycerin, 1,2,4-butanetriol, 1,2,4-pentanetriol, trimethylolethane, and trimethylolpropane), and unsaturated aliphatic triols (alkenetriol, For example, 2-hexene-1,4,5-triol, 3-hexene-1,2,5-triol) .
[0013]
Examples of the 4- to 8-valent aliphatic group include a residue obtained by removing all OH groups from a 4- to 8-valent aliphatic polyol.
Examples of the 4- to 8-valent aliphatic polyol include alkane polyols and intramolecular or intermolecular dehydrates (pentaerythritol, sorbitol, xylitol, mannitol, sorbitan, diglycerin, etc.), saccharides and derivatives thereof (glucose, mannose, Fructose, methyl glucoside, etc.).
These R¹Among them, preferred are 1 to 3 valent groups, and particularly preferred are 1 to 2 valent aliphatic hydrocarbon groups.
[0014]
R²Is H or a linear or branched alkyl group having 1 to 8 carbon atoms. The alkyl group may be the same as the alkyl group having 1 to 8 carbon atoms in R1. Among these, H and an alkyl group having 3 or less carbon atoms are preferable, a methyl group is more preferable, and H is particularly preferable. If the number of carbon atoms exceeds 8, the water solubility of (A) will deteriorate.
K in the general formula (1) is 0 or an integer of 1 or more, preferably 0. m, n and p are integers of 1 or more, and m + n is 10 or more. K, m, n, and p are integers in a range satisfying the weight average molecular weight of (A) of 1,000 to 10,000.
When m + n is less than 10, the lubricity of the lubricant is deteriorated. From the viewpoints of lubricity and water solubility, the content of EO units in the oxyalkylene group (mol%): [m / (k + m + n + p)] × 100 is preferably 20 to 70, particularly 30 to 60. . When the EO unit content is 20 mol% or more, the water solubility and lubricity of the lubricant are good, and when it is 70 mol% or less, the oil separation property is good.
[0015]
A in general formula (1)¹And A²Is one or more selected from alkylene groups having 3 or 4 carbon atoms, 1,2- and 1,3-propylene groups, 1,2-, 2,3-, 1,3-, 1,4 and iso -A butylene group. Of these, 1,2-propylene group and 1,4-butylene group are preferable.
[0016]
OA in the polyoxyalkylene chain constituting (A)¹Unit and OA²The total content of units (mol%): [(k + p) / (k + m + n + p)] × 100 is preferably 8 to 70, and more preferably 10 to 50. When it is 70 mol% or less, the solubility in water is good, and when it is 8 mol% or more, the oil separation property is good.
In general formula (1)
[0017]
[Chemical formula 5]
[0018]
Is a random bond between EO units and PO units. If the EO unit and the PO unit are not randomly bonded (block bonded), the low temperature fluidity of (A) will be poor.
[0019]
As a method for producing the compound represented by the general formula (1), R¹In the presence of a catalyst, preferably at 100 to 180 ° C. under normal pressure to increased pressure (preferably 0 to 0.6 MPa) in a C 1-8 aliphatic alcohol having 1 to 8 carbon atoms represented by [—OH] q. ), An alkylene oxide having 3 to 4 carbon atoms is added as necessary, EO and PO are randomly added, and then AO having 3 to 4 carbon atoms is added, and R²And a method for obtaining a compound when H is H. Further, the terminal of the obtained AO adduct is alkyletherified to form R²A compound in which is an alkyl group can be produced.
[0020]
As the AO having 3 to 4 carbon atoms, those added first to the aliphatic alcohol and those added after the EO / PO random addition are PO, 1,2-, 2,3- and 1,3-butylene. Oxide, isobutylene oxide, tetrahydrofuran (hereinafter abbreviated as THF) and the like. Of these, PO and 1,2-butylene oxide are preferred. Two or more of these may be used in combination, and the addition format in the case of combination may be random or block. Particularly preferred is addition of PO alone. The ratio of combined use is 100 parts by weight or less with respect to 100 parts by weight of PO.
[0021]
The catalyst used for the AO addition may be a commonly used known catalyst, such as an alkali catalyst such as hydroxide [KOH, NaOH, CsOH, Ca (OH)].₂Alkali metal or alkaline earth metal hydroxide, etc.], oxide (K 2 O
, Oxides of alkali metals or alkaline earth metals such as CaO and BaO), alkali metals (Na, K, etc.), hydrides thereof (NaH, KH, etc.), and amines (triethylamine, trimethylamine, etc.). . When THF is added alone, or when THF and other alkylene oxides are co-added, BF_Three, BCl_ThreeAlCl_Three, FeCl_Three, SnCl_ThreeLewis acids and their complexes such as BF_ThreeEther complex, BF_Three・ THF complex (BF_ThreeTHF)]; H₂SO_Four, HClO_FourProtonic acid such as KClO_Four, NaClO_FourAlkali metal perchlorates such as Ca (ClO_Four)₂, Mg (ClO_Four)₂Alkaline earth metal perchlorates such as Al (ClO_Four)_ThreeAnd other metal perchlorates other than those mentioned above.
Of these catalysts, KOH, NaOH, CsOH, BF are preferable._ThreeEther complexes and BF_Three-THF.
[0022]
In the case of alkyl etherification, it can be produced by reacting an AO adduct with an alkyl halide (having 1 to 8 carbon atoms) in the presence of an alkali (such as a hydroxide of an alkali metal such as KOH, NaOH and CsOH). . The alkyl group having 1 to 8 carbon atoms is the same as R2. The amount of the alkyl halide is preferably 1/1 to 5/1, particularly preferably 1.2 / 1 to 4/1, in terms of an equivalent ratio with respect to the hydroxyl group of the AO adduct. Moreover, the addition amount of the alkali is preferably 1/1 to 10/1 by an equivalent ratio with respect to the hydroxyl group of the AO adduct, and particularly preferably 1.2 / 1 to 5/1.
The HLB value of (A) in the present invention thus obtained is usually 8.5 or more. Preferably it is 8.8-17, More preferably, it is 9-15. If the HLB value of (A) is less than 8.5, the water solubility becomes poor.
HLB is calculated from the ratio between the organic value and the inorganic value of the compound (Oda equation), and is described in “Introduction to New Surfactant” [1996, published by Sanyo Chemical Industries, Ltd.] page 197. It is calculated by the calculation method.
[0023]
The weight average molecular weight (Mw) of (A) is usually 1,000 to 10,000, preferably 2,000 to 6,000, particularly 2,300 to 5,000. If it is less than 1,000, the lubricity of the lubricant is poor, and if it exceeds 10,000, the kinematic viscosity of the lubricant becomes too high. Mw is measured under the following conditions using gel permeation chromatography (GPC).
Measuring instrument: LC8120 manufactured by Tosoh Corporation
Eluent: Type THF
Flow rate: 0.6 (ml / min)
Column: KF-802, 803, 804
Reference substance: Polyethylene glycol
[0024]
Specific examples of the aliphatic monocarboxylic acid having 8 to 12 carbon atoms include alkanoic acids such as octanoic acid, 2-ethylhexanoic acid, nonanoic acid, decanoic acid, undecanoic acid, and dodecanoic acid. Of these, preferred are octanoic acid, nonanoic acid, and decanoic acid, particularly octanoic acid and nonanoic acid. When the number of carbon atoms is less than 8, the metal is easily rusted, and when it exceeds 12, the lubricant is easily foamed and difficult to use.
Specific examples of the aliphatic dicarboxylic acid having 8 to 12 carbon atoms include azelaic acid, sebacic acid, and dodecanedioic acid. Of these, azelaic acid, particularly sebacic acid, is preferred. When the number of carbon atoms is less than 8, the metal is easily rusted, and when it exceeds 12, the lubricant is easily foamed and difficult to use.
Of these, preferred are aliphatic monocarboxylic acids having 8 to 10 carbon atoms.
Two or more of these may be used in combination, and the ratio of the combination is 10:90 to 50:50 for the aliphatic monocarboxylic acid and the aliphatic dicarboxylic acid.
[0025]
In the lubricant for metal working in the present invention, the blending ratio of (A) and (B) is usually 1 to 400 parts by weight, preferably 5 to 100 parts by weight, with respect to (A) 100 parts by weight. Part, more preferably 10 to 50 parts by weight. If the amount of (B) is less than 1, the metal tends to rust and lubricity tends to be poor. If it exceeds 400, the oil separability of the lubricant becomes poor.
In the lubricant for metalworking of the present invention, an aliphatic amine alkylene oxide adduct (C) may be blended as necessary. The blending ratio of (C) is preferably 1 to 40 parts by weight and more preferably 5 to 30 parts by weight with respect to 100 parts by weight of (A). When (C) is 1 or more, the oil separability of the lubricant is good, and when it is 40 or less, the lubricity is good.
(C) includes alkyl monoamines having 1 to 10 or more carbon atoms (methylamine, ethylamine, diethylamine, propylamine, butylamine, octylamine, etc.): alkylenediamines having 2 to 18 or more carbon atoms (ethylenediamine, 1 , 2- and 1,3-propylenediamine, hexylenediamine, octylenediamine, decylenediamine and dodecylenediamine etc.) and polyalkylene polyamines having 4 to 18 or more carbon atoms (amine number; preferably 3 to 3) 6) Adducts of alkylene oxides having 2 to 4 carbon atoms (for example, EO, PO) such as (polyethylene polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexamethylenepentami). The number of moles of alkylene oxide added is preferably 0.5 to 2 moles per N atom of the amine. Oil separation property will become favorable as it is 0.5-2. An adduct of PO is preferred, and the number of moles added is preferably 1 to 2 moles.
Specific examples of (C) include butylamine PO4 mol adduct, octylamine PO2 mol adduct, ethylenediamine PO4 mol adduct, diethylenetriamine PO5 mol adduct, tetraethylenepentamine PO7 mol adduct. Preference is given to PO addition of polyalkylene polyamines.
[0026]
If necessary, the metal working lubricant of the present invention may contain water. When water is used, it is diluted with water so that the content of (A) is preferably 5 to 90% by weight, more preferably 10 to 50% by weight, and further diluted with water at the time of use.
The metal working lubricant of the present invention can be used as a metal working lubricant composition by adding additives such as antioxidants, extreme pressure additives, rust preventives, and antifoaming agents as necessary. . Two or more of these additives may be used in combination.
[0027]
Antioxidants include phenolic antioxidants (eg 2,4-dimethyl-6-tert-butylphenol, 4,4-butylidenebis (6-tert-butylmetacresol)); amine antioxidants (eg phenyl -Α-naphthylamine, phenyl-β-naphthylamine, etc.); dialkyl (C1-C36) zinc dithiophosphate; diallyl (C3-C36) zinc dithiophosphate; organic sulfide (for example, 4,4′-thiobis (3 -Methyl-6-t-butylphenol and the like);
[0028]
Examples of extreme pressure additives include lead soap (lead naphthenate, etc.); sulfur compounds (sulfurized fatty acids such as sulfurized oleic acid, sulfurized fatty acid esters, sulfided palm oil, sulfurized terpene, dibenzyl disulfide, and alkylthio having 8 to 24 carbon atoms. Amine salt or alkali metal salt of propionic acid, amine salt or alkali metal salt of alkylthioglycolic acid having 8 to 24 carbon atoms, etc .; Chlorine compound (chlorinated stearic acid, chlorinated paraffin, chloronaphthazanate, etc.); Phosphorus compound (Tricresyl phosphate, tributyl phosphate, tricresyl phosphite, n-butyl di-n-octyl phosphinate, di-n-butyl dihexyl phosphonate, di-n-butyl phenyl phosphonate, dibutyl phosphoramidate, amine dibutyl phosphate Etc.)
[0029]
Examples of the rust preventive include organic amines (aliphatic amines such as laurylamine, oleylamine; heterocyclic amines such as morpholine; alkanolamines such as monoethanolamine, triethanolamine, isopropanolamine, N-dimethylaminoethanolamine, C14-36 aliphatic monocarboxylic acid and its amide (myristic acid, palmitic acid, oleic acid, oleylamide, etc.); C6-C36 alkenyl succinic acid and its amide (dodecenyl succinic acid, Pentadecenyl succinic acid, octenyl succinic acid amide, etc.); aromatic carboxylic acids (benzoic acid, p-tertbutyl benzoic acid, nitrobenzoic acid, etc.); cyclohexylamine nitrite; benzotriazole; mercaptobenzothiazo ; N, N'-disalicylidene-1,2-diaminopropane; alizarin and the like. In addition, C14-36 aliphatic carboxylic acid and its amide, and C6-C36 alkenyl succinic acid and its amide also have a function as an oiliness improver.
Examples of the antifoaming agent include polyorganosiloxanes having a molecular weight of 100 to 1,000 (for example, polydimethylsiloxane).
[0030]
In the lubricant composition for metal working of the present invention, the content of (A) is preferably 5 to 90% by weight, more preferably 10 to 50% by weight. The water content is preferably 95% by weight or less, more preferably 10 to 50% by weight, and particularly preferably 20 to 50% by weight. The content when using an antioxidant is preferably 0.0001 to 2% by weight, in particular 0.001 to 1%. The content when using an extreme pressure additive is preferably 10% by weight or less, more preferably 5% by weight or less. The content in the case of using a rust inhibitor is preferably 25% by weight or less, more preferably 1 to 20% by weight. The content when using an antifoaming agent is preferably 1000 ppm or less, more preferably 10 to 500 ppm.
[0031]
The metal working lubricant of the present invention includes cutting oil, grinding oil, polishing oil, drilling oil, sliding surface lubricating oil, rolling oil, punching oil, drawing oil, press oil, forging oil, quenching oil, aluminum disc, and It can be used for metal processing oil used for processing such as polishing and cutting of a silicon wafer. Applicable metals include steel, cast iron, aluminum, alloy steel, stainless steel, copper, brass and the like.
Moreover, the metalworking lubricant composition obtained by adding various additives to the metalworking lubricant of the present invention is preferably used after diluting with water (for example, 10 to 100 times based on weight). In particular, the content of (A) is 0.5 to 3% by weight (especially 1 to 2% by weight), and the content of (B) is 0.1 to 2% by weight (particularly 0.4 to 2% by weight). It is preferable to use it diluted. This composition can be suitably used as a water-soluble solution-based metal processing lubricant.
[0032]
【Example】
The present invention will be described in detail by the following examples, but the present invention is not limited thereto. Unless otherwise specified, “%” in the text represents “% by weight”.
[0033]
The test method is as follows.
<Adjustment of test solution>
The evaluation of foamability, oil separation property and lubricity was carried out by diluting the composition shown in Table 1 described later to 5% with water.
(1) Lubricity
For lubricity, use a vibration friction wear tester (SRV tester manufactured by Optimol Co., Ltd.) and observe the friction coefficient and the wear scar diameter on the steel ball at the point contact (load 200N) between the steel ball and the flat steel disk. Evaluated. Test conditions are shown below.
<Lubricity test conditions>
Amplitude: 2 mm
Frequency: 50Hz
Temperature: 30 ° C
Time: 10 minutes
Coefficient of friction: average for 10 minutes
Oil film breakage: It was observed that the friction coefficient (μ) fluctuated. (Friction coefficient fluctuates greatly)
○: None (μ stability), △: Available (μ fluctuation range is small), ×: Yes (μ fluctuation range is large)
Wear diameter: 10 mm steel ball (SUJ-2) wear diameter (mm)
[0034]
(2) Foaming property
The foaming property was measured according to JIS K2518 Petroleum product-lubricating oil-foaming test method, and the foaming capacity immediately after blowing air and the foaming capacity 5 minutes after stopping blowing were measured.
(3) Oil separation
For oil separation, 90ml of test solution and 10ml of sliding surface oil (Dynaway 68: Cosmo Oil Co., Ltd.) are placed in a 100ml graduated cylinder with a stopper, shaken for 30 seconds, allowed to stand, and separated after 5 minutes. The volume of the oil layer and the cream layer was read.
[0035]
Production Example 1
A glass autoclave was charged with 32 g (1 mol) of methanol and 0.6 g of KOH, and 261 g (9 mol) of PO was dropped from a pressure-resistant dropping funnel at 110 ° C. over 10 hours. Then, it was made to react until a pressure became equilibrium at 130 degreeC. Subsequently, 1,000 g (22.7 mol) of EO and 1,000 g (17.2 mol) of PO were added dropwise at 125 ° C. and reacted at the same temperature until the pressure reached equilibrium. Thereafter, 261 g (9 mol) of PO was further added dropwise at 110 ° C. until the pressure reached equilibrium. After cooling, an adsorption treatment agent [KYOWARD 600 and KYOWARD 1000 manufactured by Kyowa Chemical Industry Co., Ltd. The same shall apply hereinafter. ], Filtered, and dehydrated under reduced pressure to obtain 2522 g (A-1) of polyether in which 9 moles of PO, 22.7 moles of EO and 17.2 moles of PO were added randomly, and 9 moles of PO were added to methanol. HLB was 10.3 and Mw was 2550.
[0036]
Production Example 2
A glass autoclave was charged with 118 g (1 mol) of hexylene glycol and 7.5 g of KOH, and 1496 g (34 mol) of EO and 522 g (9 mol) of PO were added dropwise at 125 ° C. from a pressure-resistant dropping funnel. Then, after making it react until it becomes pressure equilibrium at the same temperature, PO986g (17 mol) was further dripped at the temperature of 110 degreeC, and it reacted until it became pressure equilibrium at the same temperature. After cooling, the resultant was filtered with an adsorption treatment agent and dehydrated under reduced pressure to obtain 3090 g (A-2) of polyether in which EO 34 mol, PO 9 mol random, and PO 17 mol were added to hexylene glycol. HLB was 11.9 and Mw was 3100.
[0037]
Production Example 3
Into a glass autoclave, 92 g (1 mol) of glycerin and 10 parts of KOH were charged, and 1760 g (40 mol) of EO and 986 g (17 mol) of PO were added dropwise at 125 ° C. from a pressure-resistant dropping funnel. Then, after making it react until it became pressure equilibrium at the same temperature, PO696g (12 mol) was further dripped at 110 degreeC, and it was made to react at the same temperature until it became pressure equilibrium. After cooling, the resultant was filtered with an adsorption treatment agent and dehydrated under reduced pressure to obtain 3503 g (A-3) of polyether in which EO 40 mol, PO 17 mol random, and PO 12 mol were added to glycerin. HLB was 12.5 and Mw was 3500.
[0038]
Production Example 4
A glass autoclave is charged with 62 g (1 mol) of ethylene glycol and 7.5 g of powdered KOH, and 880 g (20 mol) and 870 g (15 mol) of EO are added dropwise from a pressure-resistant dropping funnel at a temperature of 125 ° C. Reacted. Subsequently, 216 g (3 mol) of 1,2-butylene oxide and 232 g (4 mol) of PO were dropped from a dropping funnel and reacted at a temperature of 110 ° C. until pressure equilibrium was reached. After cooling, the resultant was filtered with an adsorption treatment agent and dehydrated under reduced pressure to obtain 2234 g (A-4) of random polyether of 20 mol of EO and 15 mol of PO and 3 mol of butylene oxide and 4 mol of PO in ethylene glycol. HLB was 10.7 and Mw was 2200.
[0039]
Comparative production example 1
A glass autoclave was charged with 200 g (0.1 mol) of polyethylene glycol (number average molecular weight 2,000) and 0.75 g of powdered KOH, and 300 g of PO (5.2 mol) was dropped at a temperature of 110 ° C. from a pressure-resistant dropping funnel. The reaction was continued until pressure equilibrium was reached. After cooling, the solution was filtered with an adsorption treatment agent and dehydrated under reduced pressure to obtain 493 g (A′-1) of a PO block adduct of polyethylene glycol having an HLB of 10.5 and an Mw of 5000.
[0040]
Comparative production example 2
A glass autoclave was charged with 74 g (1 mol) of n-butanol and 4.8 g of KOH, and a mixture of 915.2 g (20.8 mol) of EO and 166.4 g (15.8 mol) of PO from a pressure-resistant dropping funnel at 110 ° C. for 15 hours. It was dripped over. Then, it was made to react at 130 degreeC for 10 hours, and was cooled. After cooling, it is treated with an adsorption treating agent, filtered, and dehydrated under reduced pressure. 28.8 mol of EO of 1-mol of n-butanol with HLB of 11.6 and Mw of 1900 / PO 15.8 mol of random adduct 1888 g (A′-2) )
[0041]
Comparative production example 3
A glass autoclave was charged with 1750 g (1 mol) of polypropylene glycol (number average molecular weight 1,750) and 0.7 g of KOH, and 117 g (2.7 mol) of EO was dropped from a pressure-resistant dropping funnel at 130 ° C. over 2 hours. Then, it was made to react at 130 degreeC for 4 hours, and it cooled. After cooling, it was treated with an adsorption treating agent, filtered, and dehydrated under reduced pressure to obtain 1849 g (A′-3) of an 2.7-mol adduct of polypropylene glycol having an HLB of 5.5 and an Mw of 1860.
[0042]
Comparative production example 4
A glass autoclave was charged with 32 g (1 mol) of methanol and 0.2 g of KOH, and 174 g (3 mol) of PO was dropped from a pressure-resistant dropping funnel over 2 hours at 100 ° C., and then 264 g (6 mol) of EO and 290 g (5 mol) of PO were added. The solution was added dropwise at 5 ° C. over 5 hours and reacted at the same temperature until pressure equilibrium was reached. Subsequently, 174 g (3 mol) of PO was dropped from the dropping funnel and reacted until pressure equilibrium was reached. After cooling, it is treated with an adsorption treating agent, and dehydrated under reduced pressure, and 934 g of a block adduct of PO3 mol of methanol having an HLB of 9.2, Mw of 930, EO6 mol and PO5 mol, and PO3 mol of a block adduct (A′- 4) was obtained.
[0043]
Examples 1-6, Comparative Examples 1-6
Based on the formulation shown in Table 1 below, lubricant compositions for metal working of Examples 1 to 6 and Comparative Examples 1 to 6 were obtained. (Unit is parts by weight)
[0044]
[Table 1]
[0045]
Table 2 shows the results of measurement of product appearance, oil film breakage, friction coefficient and wear diameter, foaming property, and oil separation property using the metal processing lubricant composition described in Table 1.
[0046]
[Table 2]
[0047]
【The invention's effect】
The polyether-based metal processing lubricant of the present invention has the effect of being excellent in oil separation, lubricity, and low foamability. Therefore, it is extremely suitable as a metal working lubricant used for processing such as grinding and cutting of cutting oil, sliding surface lubricating oil, rolling oil, drawing oil, press oil, forging oil, aluminum disk and silicon wafer.

Claims (5)

A polyether (A) represented by the following general formula (1), having an HLB of 8.5 or more and a weight average molecular weight of 1,000 to 10,000, An aliphatic monocarboxylic acid and / or dicarboxylic acid (B) having 8 to 12 carbon atoms , and a propylene oxide adduct (C) of a polyalkylene polyamine (4 to 18 carbon atoms and 3 to 6 carbon atoms) , (B) 1-400 weight part and (C) are 1-40 weight part lubricants with respect to 100 weight part of (A) compounding ratio.
[Wherein, R ¹ is a residue obtained by removing q OH groups from a C 1-8 valent aliphatic alcohol; R ² is H or an alkyl group having 1 to 8 carbon atoms; A ¹ and A ² Is one or more alkylene groups having 3 or 4 carbon atoms; k is 0 or an integer of 1 or more; m and n are integers of 1 or more; and m + n is 10 or more; p is an integer of 1 or more; An integer from 1 to 8;
Represents a randomly bonded (poly) oxyethylene / (poly) oxypropylene chain; when q is 2 to 8, q k, m, n, p and R ² may be the same or different. ] The lubricant according to claim 1 , wherein (C) is a compound in which propylene oxide is added in an amount of 0.5 to 2 mol per N atom. The lubricant according to claim 1 or 2, wherein the ratio of (OCH ₂ CH ₂ ) units in all oxyalkylene groups in (A) is 20 to 70 mol%. The lubricant according to any of claims 1-3 wherein q is 1-3. Lubricant for metal working comprising the lubricant according to any one of claims 1 to 4 , and one or more additives selected from the group consisting of an antioxidant, an extreme pressure additive, a rust inhibitor, and an antifoaming agent. Agent composition.