WO2005095562A1

WO2005095562A1 - Lubricating oil composition for use in working aluminum tube

Info

Publication number: WO2005095562A1
Application number: PCT/JP2005/005757
Authority: WO
Inventors: Hiroshi Kametsuka; Junichi Shibata
Original assignee: Nippon Oil Corporation
Priority date: 2004-03-31
Filing date: 2005-03-28
Publication date: 2005-10-13
Also published as: JP5038584B2; JP2005290160A

Abstract

A lubricating oil composition for use in working an aluminum tube, characterized in that it comprises at least one selected from polybutene and a polyalkylene glycol, as a base oil, and at least one oily agent selected from among a partially etherificated compound from a multivalent alcohol, an ester, an alcohol and a fatty acid in an amount of 0.5 to 40 mass % relative to the total amount of the composition. The above lubricating oil composition for use in working an aluminum tube exhibits excellent lubricity in the tube drawing, form rolling or the like of an aluminum tube, and allows the satisfactory reduction of the amount of an oil remaining in a tube in an annealing step.

Description

Specification

Lubricating oil composition for aluminum pipe processing

Technical field

[0001] The present invention relates to a lubricating oil composition for processing aluminum pipes, which is used for drawing and rolling of aluminum pipes.

Background art

Conventionally, heat exchangers having electric heating tubes have been widely used in refrigeration systems such as air conditioners for automobiles, and aluminum tubes are often used as the electric heating tubes because of their light weight.

[0003] As a method for manufacturing an aluminum tube, for example, lubricating oil is supplied to the inner and outer surfaces of an aluminum tube, drawn, wound up in a coil shape, and then placed in a reducing gas atmosphere or an inert gas atmosphere. And a method of annealing by heating in the inside.

[0004] Here, as the lubricating oil used in the drawing process of the aluminum pipe, it is desirable to use a lubricating oil which is low in molecular weight by the heat of the annealing process and vaporized. However, under normal heating conditions in the annealing step, low-molecular-weight components often do not proceed sufficiently, and as a result, components that do not evaporate at room temperature may be generated and remain on the aluminum tube. Also, when a long aluminum tube is wound into a coil or when the diameter of the aluminum tube is small, the lubricating oil component gasified by low molecular weight filtration must be discharged out of the tube only by its volume expansion. Is difficult, and some of the gas components condense during the cooling process, resulting in residual oil or overflow in the pipe.

[0005] As described above, when an aluminum tube in which residual oil or residue overflows (hereinafter collectively referred to as "residual oil in a tube") is used as an electric heating tube, the heat exchange efficiency is reduced. It can be In addition, because the residual oil in the pipe is derived from hydrocarbon-based lubricating oil as described above, it does not show compatibility with the Fluorocarbon (HFC) refrigerant at the outlet and residual oil or residual oil precipitates in the refrigeration system. This may cause problems such as clogging of the expansion mechanism.

[0006] Furthermore, if residual oil in the pipe is brazed at the time of assembling the heat exchanger of the refrigeration system, a gas is generated at the time of the brazing operation, or a carbide is generated by reacting with air in the system. And may cause poor brazing. In addition, if the aluminum tube in which the carbide thus generated remains is used as an electric heating tube, the carbide is mixed into the refrigerating machine oil in the refrigerating system and causes deterioration of the refrigerating machine oil.

[0007] In order to solve such problems, studies have been made on reducing the residual oil in the aluminum pipe and reducing the influence of these on the refrigeration system. There has been proposed a method of removing, a method of purging gas in a tube with nitrogen or an inert gas during heat annealing, or a method of removing residual oil in a tube by combining both (for example, Patent Documents 1 to 3). See.) ₀

Patent Document 1: JP-A-6-228649

Patent Document 2: JP-A-6-279860

Patent Document 3: JP-A-7-197283

Disclosure of the invention

Problems to be solved by the invention

[0008] However, all of the above-mentioned conventional methods require the addition or modification of equipment for removing residual oil in the pipes, and are accompanied by a decrease in productivity due to an increase in the number of steps. As a result, the manufacturing cost increases.

[0009] On the other hand, the fact is that the lubricating oil for processing aluminum pipes has not yet been sufficiently studied from the viewpoint of reducing residual oil in the pipes. Further, according to the study of the present inventors, in the case of the conventional lubricating oil for processing aluminum pipes, when the kinematic viscosity is not adjusted, an additive such as a solvent or an oil agent for adjusting the kinematic viscosity is used. If not properly selected, lubrication will be reduced during drawing of the aluminum tube, which may cause seizure of the plug.

[0010] The present invention has been made in view of such circumstances, and has been made by drawing a aluminum pipe.

Another object of the present invention is to provide a lubricating oil composition for processing aluminum pipes, which exhibits excellent lubricity in rolling and the like and can sufficiently reduce residual oil in the pipe in an annealing step.

Means for solving the problem

[0011] In order to solve the above-mentioned problems, the lubricating oil composition for processing an aluminum pipe of the present invention comprises: The base oil is at least one selected from the group consisting of butenes and polyalkylene glycols.Partial ether compounds of dihydric or higher polyhydric alcohols, esters, alcohols, and fatty acids are used.At least one oil agent is selected based on the total amount of the composition. 0.5 to 40% by mass.

[0012] The lubricating oil composition for processing aluminum pipes of the present invention, which has the above-described structure, can exhibit excellent lubricity in drawing, rolling and the like, and has an excellent lubricating property in the annealing step. It shows sufficient thermal decomposition properties and vaporization characteristics at the heating temperature. Therefore, according to the present invention, it is possible to reduce the residual oil in the long and coiled aluminum tube at low cost without performing a special residual oil removal treatment such as purging in the annealing furnace, and as a result, Prevention of seizure during drawing or rolling, improvement of brazeability of aluminum pipe, and prevention of mixing of residual oil in the pipe or its carbide into the refrigeration system after annealing can be sufficiently achieved. .

The invention's effect

[0013] According to the present invention, an aluminum pipe that exhibits excellent lubricity especially in drawing and rolling of an aluminum pipe and is capable of sufficiently reducing residual oil in the pipe in an annealing step. A lubricating oil composition for rubber tube processing is provided.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described in detail.

[0015] The lubricating oil composition for processing aluminum pipes of the present invention (hereinafter, sometimes simply referred to as "the lubricating oil composition of the present invention") may comprise at least one base oil selected from polybutene and polyalkylene glycol. The composition contains at least one oil agent selected from the following (A-1) to (A-4) forces in an amount of 0.5 to 40% by mass based on the total amount of the composition.

(A— 1) Partial ether compound of dihydric or higher polyhydric alcohol

(A-2) ester

(A-3) Alcohol

(A-4) Fatty acids.

[0017] Among the base oils used in the present invention, polybutene is a polymer obtained by homopolymerization or copolymerization of two or more butene monomers such as 1-butene, 2-butene and isobutene. . The polybutene referred to in the present invention includes its hydride.

As the polybutene used in the present invention, those having a high isobutene ratio are preferred from the viewpoint of reducing the residual oil in the tube. More specifically, the infrared absorbance was measured by the infrared total reflection absorption method. polybutene is preferred, the infrared absorbance I of per reflection once in 1230cm ^_1 is 0.025 or more in the case. Isobutene polybutene has a quaternary carbon in its molecular structure, including as a raw material, because the skeleton vibration of quaternary carbon is reflected to the infrared absorbance I at 1230 cm ^_1, size infrared absorbance I! /, The value Means that the isobutene ratio is higher. Incidentally, when the infrared absorbance I at 1230 cm ^_1 is less than 0.025, the thermal decomposition of the polybutene tends to be insufficient effect of reducing the pipe residual oil decreases.

[0019] The infrared absorbance I defined in the present invention is a horizontal total reflection absorption measurement apparatus (MCT detector (MCT detector) using a liquid crystal of ZnSe having a crystal length of 70 mm and a crystal thickness of 3 mm. It can be measured using FT-IR (manufactured by JEOL Ltd.) having a mercury cadmium telluride (semiconductor detector of mercury cadmium telluride compound). The conditions are as follows: the incident angle is 60 °, the resolution is 4 ^cm_1 , and the number of integrations is 1,000. However, in this condition, since the infrared absorption scan Bae-vector number of reflections is equivalent to 6.7 times is obtained as the absolute value of the absorption intensity per infrared absorbance reflecting the I 1 times the polybutene in 1230 cm ^_1 I will ask for it. Incidentally, according to the above measuring conditions, the absorption peak of the infrared absorbance I derived from the quaternary carbon is generally appears at 1230 cm ^_1 force this peak appears position may be slightly shifted between 1220~1240cm ^{_ 1.} Therefore, our Itewa the present invention, as the height of the peaks that appear in the 1230 cm ^_1 is the highest, and valleys of the spectrum appearing Te Contact! /, The 1170-119 Ocm ^_1, based between 1250~ 1270cm ^_1 or during which Here, a baseline is drawn between the valley of the spectrum that appears and the absorption intensity is determined.

In the present invention, one of the above polybutenes may be used alone, or two or more may be used in combination. Further, one or more of the above polybutenes can be used in combination with a polyalkylene glycol described below.

The polyalkylene glycol preferably has a structure represented by the following general formula (1). R ¹ -O-(R ² -O)-R ³ (1)

(In the formula, R ¹ and R ³ may be the same or different and each represent a hydrogen atom or an alkyl group, R ² represents an alkylene group, n represents an integer of 10 to 100, and n R ² May be the same or different.)

In the general formula (1), when one or both of R ^{1 and} R ³ is an alkyl group, the number of carbon atoms of the alkyl group can be arbitrarily selected. However, lubricating oil may remain in the pipe after annealing. Therefore, the alkyl group preferably has 1 to 18 carbon atoms, and more preferably 1 to 10 carbon atoms. The alkyl group may be linear or branched. Specifically, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec- Butyl group, tert butyl group, linear or branched pentyl group, linear or branched hexyl group, linear or branched heptyl group, linear or branched Octyl group, linear or branched nonyl group, linear or branched decyl group, linear or branched decyl group, linear or branched dodecyl group, linear Or a branched tridecyl group, a linear or branched tetradecyl group, a linear or branched pentadecyl group, a linear or branched hexadecyl group, a linear or branched And a straight-chain or branched octadecyl group.

[0023] The number of carbon atoms of the alkylene group represented by the general formula R ² is not particularly limited, in general preferably 2 to 10 carbon atoms. Specific examples of the divalent alkylene group having 2 to 10 carbon atoms include an ethylene group, a propylene group (including a 1-methylethylene group and a 2-methylethylene group), a trimethylene group, and a butylene group (1-ethylethylene group). And 2-ethylethylene groups), 1,2-dimethylethylene group, 2,2-dimethylethylene group, 1-methyltrimethylene group, 2-methyltrimethylene group, 3-methyltrimethylene group, tetramethylene Group, pentylene group (including 1-butylethylene group and 2-butylethylene group), 1-ethyl-1-methylethylene group, 1-ethyl-2-methylethylene group, 1,1,2-trimethylethylene group, 1,2,2 —Trimethylethylene group, hexylene group (including 1-butylethylene group and 2-butylethylene group), 1-methyl-1-propylethylene group, 1-methyl-2-propyl An ethylene group, 2-methyl-2-propyl-ethylene group, 1, 1 Je Tylethylene group, 1,2-Getylethylene group, 2,2-Getylethylene group, 1-ethyl-1,2-dimethylethylene group, 1-ethyl-2,2-dimethylethylene group, 2-ethylethylene 1, 1 -Dimethylethylene group, 2-ethyl-1,2-dimethylethylene group, 1,1,2,2-tetramethylethylene group, heptylene group (including 1-pentylethylene group and 2-pentyleneethylene group), otathylene group (1 Hexylethylene group and 2-hexylethylene group), nonylene group (including 1 heptylethylene group and 2-heptylethylene group), decylene group (including 1-octylethylene group and 2-octylethylene group), etc. Is mentioned.

Among these, as R ² , an alkylene group having 3 or more carbon atoms is preferable because of its low hygroscopicity and excellent lubricating properties, and difficulty in hydrolysis. Are more preferred. In addition, polyalkylene glycol having high hygroscopicity may generate a lower carboxylic acid, which is an ant-like corrosive medium, by decomposition, and may leak in a short time when attached to an aluminum tube.

[0025] Further, it is possible to further reduce the residual渣分during annealing, from the viewpoint of the residue after annealing can be reduced adverse effects on the refrigeration system, 8 or less carbon atoms as R ² It is even more preferable to use an alkylene group having 6 or less carbon atoms.

[0026] In addition, the polyalkylene glycol represented by the general formula (1) is also the n R ² is a homopolymer of the same alkylene groups, including two or more R ² poly A copolymer having one oxyalkylene chain (R ² -0) may be used. In the case of a copolymer, the ratio of the monomers and the arrangement of the monomers constituting the copolymer are not limited, but may vary depending on the random copolymer, the alternating copolymer and the block copolymer. Well ヽ.

[0027] In the case where the polyalkylene glycol represented by the general formula (1) is a homopolymer, R ² has low hygroscopicity and excellent lubricity, and is not easily hydrolyzed. An alkylene group having 4 to 6 carbon atoms because the residue (residual carbon) can be further reduced and the adverse effects of the residue after annealing on the refrigeration system can be reduced. Among these, a butylene group is more preferable in view of availability of raw materials.

[0028] Further, when the polyalkylene glycol represented by the general formula (1) is a copolymer, As a result, it has low lubricity due to low hygroscopicity and can further reduce the residue during annealing, which is less likely to cause hydrolysis, and reduces the adverse effects of the residue after annealing on the refrigeration system In view of the fact that the alkylene group can be used, it is preferably an alkylene group having 3 to 6 carbon atoms. Among them, a propylene group and a butylene group are more preferable than the availability of raw materials.

Further, in the present invention, when n in the above general formula (1) is less than 10, the boiling point may be reduced, and the decomposability at the ether bond may be reduced. On the other hand, when n exceeds 100, the probability of remaining as a residual oil component tends to increase even when the base oil has a structure that is easily decomposed. In addition, the post-annealing residue may have an adverse effect on the refrigeration system. Therefore, n is preferably from 10 to: L00.

In the present invention, one of the above polyalkylene glycols may be used alone, or two or more may be used in combination. Further, one or more of the above polyalkylene glycols can be used in combination with polybutene.

[0031] The polybutene and polyalkylene glycol used in the present invention have sufficient thermal decomposability, and are decomposed into monomers or oligomers and vaporized at the heating temperature in the annealing step. Since these decomposed products do not condense even after cooling in a furnace having a relatively low boiling point, the lubricating oil component is discharged out of the tube when the inside of the tube is purged after annealing. Therefore, the use of at least one selected from the group consisting of polybutene and polyalkylene glycol as the base oil of the lubricating oil makes it possible to reduce the amount of oil remaining in the pipe after annealing. Also, by using this base oil, the adverse effects of the residue after annealing on the refrigeration system can be reduced.

[0032] The lubricating oil composition of the present invention contains 0.005 to 40% by mass of the components (A-1) to (A-4) based on the total amount of the composition. Therefore, the total content of the base oil, polybutene and polyalkylene glycol, is 99.5% by mass or less, preferably 60 to 99.5% by mass, more preferably 75 to 9% by mass, based on the total amount of the composition. 99% by mass. If the total content of polybutene and polyalkylene glycol exceeds 99.5% by mass, it is not possible to obtain a sufficient effect by the addition of the components (A-1) to (A-4) described later. If the total content of polybutene and polyalkylene glycol is less than 60% by mass, There is a tendency that the effect of reducing residual oil in pipes by using polyalkylene glycol is insufficient.

[0033] The lubricating oil composition of the present invention may further contain a base oil other than the above-mentioned polybutene and polyalkylene glycol, as long as the excellent properties are not impaired. Examples of strong base oils include mineral oils, hydrocarbon synthetic oils other than polybutene (olefin polymers, naphthalene conjugates, alkylbenzenes, etc.), and ether oils other than polyalkylene glycols (polyvinyl ether, ketone, polyphenyl ether). And the like, ester oils (such as aromatic esters, dibasic acid esters, polyol esters, complex esters, and carbonate esters), silicones, polysiloxanes, and perfluoroethers.

[0034] The content of the base oil other than polybutene and polyalkylene glycol can further reduce the residual oil content in the tube after annealing, and further reduce the adverse effect of the residue after annealing on the refrigeration system. From the viewpoint that the composition can be used, it is preferably 40% by mass or less, more preferably 30% by mass or less, further preferably 20% by mass or less, and particularly preferably 10% by mass or less, based on the total amount of the composition. It is most preferable that the refrigerator oil composition of the present invention does not contain a base oil other than polybutene and polyalkylene glycol.

Next, each of the components (A-1) to (A-4) will be described in detail.

(A-1) The polyhydric alcohol constituting the partially etherified dihydric or higher polyhydric alcohol may be any of dihydric alcohol, trihydric alcohol and tetrahydric or higher polyhydric alcohol. .

[0037] Examples of powerful polyhydric alcohols include ethylene glycol, propylene glycol, trimethylene glycol (1,3 propanediol), butylene glycol (1,2-butanediol), and 1,1- Dimethylethylene glycol (2-methyl-1,3-propanediol), 1,2-dimethylethylene glycol (2,3-butanediol), 1-methyltriethylene glycol (1,3-butanediol), 2-methyltrimethylene glycol (2-methyl- 1,3 propanediol), tetramethylene glycol (1,4 butanediol), pentylene glycol (1,2-pentanediol), 2,2-dimethyltrimethylene glycol (2,2 dimethyl-1,3 propanediol) , 1,5 pentanediol, Oppentyl glycol, hexylene glycol (1,2-hexanediol), 1,6-hexanediol, 2-ethyl-2-methyl-1,3-propanediol, 1,7-heptanediol, 2-methyl-2-propyl-1,3-propane Divalents such as diol, 2,2 getyl 1,3 propanediol, 1,8 octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-decanediol, and 1,12-dodecanediol Alcohols and dimer to dimer of these dihydric alcohols are exemplified.

[0038] Also, trimethylolethane, trimethylolpropane, trimethylolbutane, di (trimethylolpropane), tree (trimethylolpropane), pentaerythritol, gee (pentaerythritol), tree (pentaerythritol), glycerin Polyglycerol (2-8 glycerin), 1,3,5 pentanetriol, sorbitol, sorbitan, sorbitol glycerin condensate, adtol, arabitol, xylitol and mannitol. Can also be used.

[0039] Furthermore, sugars such as xylose, arabinose, ribose, rhamnose, glucose, fructose, galactatose, mannose, sonorebose, cellobiose, manoletose, isomanoleose, trenoperulose, sucrose, raffinose, gentianose, and merezitose, and these. Partially ethereal dang, methyldalcoside (glycoside) and the like can also be used.

[0040] (A-1) The partially etherified product of a dihydric or higher polyhydric alcohol is a divalent product in which a part of the hydroxyl groups of the above-mentioned polyhydric alcohol is etherified. As ethereal daggers, alkyl etherification, alkyl etherification, cycloalkyl etherification, alkyl cycloalkyl etherification, aryl etherification, alkyl aryl etherification and aryl alkyl etherification! However, if the above polyhydric alcohol is alkyl etherified, the amount of residual oil in the tube after annealing can be further reduced.

? Leap lube can be obtained.

[0041] In addition, in the case of an alkyl ether bond, the carbon number of the alkyl group to be ether-bonded is not particularly limited, but the alkyl group preferably has 1 to 18 carbon atoms. Examples of the alkyl group having 1 to 18 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a straight-chain or Branched pentyl, straight or branched hexyl, straight or branched heptyl A straight-chain or branched octyl group, a straight-chain or branched nonyl group, a straight-chain or branched decyl group, a straight-chain or branched decyl group, a straight-chain or branched Dodecyl group, linear or branched tridecyl group, linear or branched tetradecyl group, linear or branched pentadecyl group, linear or branched hexadecyl group, linear or branched And a linear or branched octadecyl group.

[0042] Among these alkyl groups, an alkyl group having 3 or more carbon atoms is preferable, and an alkyl group having 7 or more carbon atoms is more preferable, and an alkyl group having 5 or more carbon atoms is particularly preferable. When the carbon number is 16 or less, the amount of residual oil in the pipe after annealing can be further reduced, and the adverse effect of the residue after annealing on the refrigeration system can be further reduced. Further, it is more preferable that the number of carbon atoms be 14 or less, more preferably 12 or less.

[0043] The component (A-1) in the present invention is selected from the group consisting of ethylene, which can provide a higher level of lubricity in a drawing step, a rolling step, and the like, and can further reduce residual oil in a pipe in an annealing step. Partially etherified products of glycol, partial etherified products of polyethylene glycol (2-10 mer of ethylene glycol), partially etherified products of propylene glycol, partially etherified products of polypropylene glycol (2-10 mer of propylene glycol), glycerin Partially etherified products, partially etherified products of diglycerin, partially etherified products of triglycerin, partially etherified products of trimethylolethane, partially etherified products of trimethylolpropane and partially etherified products of trimethylolbutane, and mixtures thereof are preferred. Part of ethylene glycol; -Teruido, partial etherified product of polyethylene glycol (2 to 8 mer of ethylene glycol), partial etherified product of propylene glycol, partial etherified product of polypropylene glycol (2 to 8 mer of propylene glycol), partially etherified product of glycerin And a partially etherified product of diglycerin and a mixture thereof; a partially etherified product of ethylene glycol, a partially etherified product of polyethylene glycol (a di- to hexamer of ethylene glycol), a partially etherified product of propylene glycol, and Partially etherified glycerin, as well as mixtures thereof, are more preferred.

[0044] The component (A-1) in the present invention includes one of the hydroxyl groups of the polyhydric alcohol. Particularly preferred is a monoethereal sword that is etherified. If a fully etherified product obtained by etherifying all the hydroxyl groups of the above polyhydric alcohol is used instead of the (AI) component, sufficient lubricity cannot be obtained.

[0045] The alcohol constituting the (A-2) ester may be either a monohydric alcohol or a polyhydric alcohol. The carboxylic acid constituting the ester may be a monobasic acid or a polybasic acid!

As the monohydric alcohol, one having 1 to 24 carbon atoms is usually used, and such an alcohol may be linear or branched, and may be shifted. Specific examples of the monohydric alcohol having 1 to 24 carbon atoms include methanol, ethanol, linear or branched propanol, linear or branched butanol, and linear or branched pentanol. Linear or branched hexanol, linear or branched heptanol, linear or branched octanol, linear or branched nonanol, linear or branched decanol, Linear or branched dendecanol, linear or branched dodecanol, linear or branched tridecanol, linear or branched tetradecanol, linear or branched dendecanol Linear or branched hexadecanol, linear or branched heptadecanol, linear or branched octadecanol, linear or branched nonadenicol, linear or branched Eiko Examples include sanol, linear or branched heneicosanol, linear or branched tricosanol, linear or branched tetracosanol, and mixtures thereof.

[0047] As the polyhydric alcohol, one having usually 2 to 10 valency, preferably 2 to 6 valency is used. Specific examples of the di- to di-hydric alcohol include ethylene glycol, diethylene glycol, polyethylene glycol (3 to 15 mer of ethylene glycol), 1,3-pronondiol, 1,2-propanediol, 1,3-butanediol, 1,4 butanediol, 2-methyl-1,2 propanediol, 2-methyl-1,3 propanediol, 1,2 propanediol, 1,3 pentanediol, 1,4 pentanediol, 1,5 pentanediol, neopentyl Dihydric alcohols such as glycol; glycerin, polyglycerin (2 to 8 mer of glycerin such as diglycerin, triglycerin, tetraglycerin), trimethylolalkane (trimethylolethane, trimethylolpropane, trimethylolbu) Tanerythr) and their dimer to octamer, pentaerythritol, and their dimer to octamer, 1,2,4 butanetriol, 1,3,5 pentanetriol, 1,2,6 hexanetriol, 1 Polyhydric alcohols such as butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adtol, arabitol, xylitol, mannitol; xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose And saccharides such as mannose, sonorebose, cellobiose, manoletose, isomareletose, trenoperose and sucrose, and mixtures of two or more of these.

[0048] Among these, ethylene glycol, diethylene glycol, polyethylene glycol (preferably a 3 to 10 mer of ethylene glycol), propylene glycol, dipropylene glycol, and polypropylene glycol (preferably 3 to 10 weight of propylene glycol) Isomer), 1,3-propanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, glycerin, diglycerin, triglycerin, trimethylolalkane (trimethylolethane, trimethylolpropane) , Trimethylol butane) and their dimers and tetramers, pentaerythritol, dipentaerythritol, 1,2,4 butanetriol, 1,3,5 pentanetriol, 1,2,6 hexanetriol, 1 , 2, 3, 4 butante Lumpur, sorbitol, sorbitan, sorbitol glyceryl phosphate condensates, add - Tall, Arabitoru, divalent to hexavalent alcohols, mixtures of two or more of these as well, such as xylitol. More preferred are ethylene glycol, propylene glycol, neopentyl glycol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, sorbitan, and mixtures of two or more of these.

[0049] On the other hand, as the monobasic acid among the carboxylic acids constituting the (A-2) ester, a fatty acid having 6 to 24 carbon atoms is usually used. The powerful monobasic acid may be linear or branched, and may be further saturated or unsaturated. Specifically, linear or branched hexanoic acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, Linear or branched pentadecanoic acid, linear or branched dodecanoic acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, Chain or branched Hexadecanoic acid, linear or branched octadecanoic acid, linear or branched hydroxoxy octadecanoic acid, linear or branched nonadecanoic acid, linear or branched icosanoic acid, linear Saturated fatty acids such as linear or branched heneicosanoic acid, linear or branched docosanoic acid, linear or branched tricosanoic acid, linear or branched tetracosanoic acid; linear or branched Hexenoic acid, linear or branched heptenoic acid, linear or branched otatenic acid, linear or branched otatenic acid, linear or branched nonenic acid, linear Or branched decenoic acid, linear or branched pentadecenoic acid, linear or branched dodecenoic acid, linear or branched tridecenoic acid, linear or branched tetradecenoic acid, linear Or branched pentadecenoic acid, linear or branched Hexadecenoic acid, linear or branched octadecenoic acid, linear or branched hydroxoxy decadenoic acid, linear or branched nonadecenoic acid, linear or branched eicosenic acid, Unsaturated fatty acids such as linear or branched heneicosenoic acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, linear or branched tetracosenoic acid, and two or more of these And mixtures thereof. Among these, a saturated fatty acid having 8 to 20 carbon atoms, an unsaturated fatty acid having 8 to 20 carbon atoms, and a mixture of two or more thereof are preferable.

Examples of the polybasic acid constituting the (A-2) ester include dibasic acids having 2 to 16 carbon atoms and trimellitic acid. The dibasic acid having 2 to 16 carbon atoms may be linear or branched, and may be saturated or unsaturated. Specifically, ethanedioic acid, propanedioic acid, linear or branched butanedioic acid, linear or branched pentanedioic acid, linear or branched hexanedioic acid, Chain or branched octane diacid, linear or branched nonanninic acid, linear or branched decandioic acid, linear or branched pentane diacid, linear or branched dodecane Diacid, linear or branched tridecandioic acid, linear or branched tetradecandioic acid, linear or branched heptadecandioic acid, linear or branched hexadecandioic acid; straight Linear or branched hexenedioic acid, linear or branched otatenedioic acid, linear or branched nonennic acid, linear or branched decenedioic acid, linear or branched Pendecene diacid, linear or branched dodecene diacid, linear or branched tridecene diacid, linear Or branched Examples thereof include tetradecene diacid, linear or branched heptadecenedioic acid, linear or branched hexadecenedioic acid, and a mixture of two or more thereof.

The combination of the alcohol and the carboxylic acid constituting the (A-2) ester is arbitrary, and examples thereof include the following combinations (8-2-1) to (8-2-7).

(A-2-1) Ester of monohydric alcohol with monobasic acid

(A-2-2) Ester of polyhydric alcohol with monobasic acid

(A- 2-3) —Ester of polyhydric alcohol with polybasic acid

(A-2-4) Ester of polyhydric alcohol with polybasic acid

(A-2-5) Estenole of mixed alcohol of polyhydric alcohol and polyhydric alcohol with polybasic acid

6) Este of polyhydric alcohol with mixed carboxylic acid of monobasic acid and polybasic acid

(A-2-7) —Ester of a mixed alcohol of a polyhydric alcohol and a polyhydric alcohol with a mixed carboxylic acid of a monobasic acid and a polybasic acid.

When a polyhydric alcohol is used as the alcohol component, the resulting ester may be a complete ester in which all hydroxyl groups in the polyhydric alcohol are esterified. Some of the hydroxyl groups are not esterified. It may be a partial ester remaining as a hydroxyl group at the same time. When a polybasic acid is used as the carboxylic acid component, the carboxyl group may be a complete ester in which all the carboxyl groups are esterified. May be the remaining partial ester.

[0053] Among the combinations shown in the above (8-2-1) to (8-2-7), (A-2-1) -hydric alcohol and monobasic acid are more excellent in lubricity. Are preferred.

[0054] (A-2) The carbon number of the ester is not particularly limited, but the carbon number of the ester is preferably 7 or more, and more preferably 9 or more because of its excellent lubricity improving effect. The above is more preferred. Also, if the carbon number is too large, the residual oil content in the pipe after annealing may increase or the post-annealing residue may adversely affect the refrigeration system. The number of carbon atoms of 26 or less is preferred 24 or less is more preferred 22 or less Below is more preferred.

As the alcohol (A-3), the monohydric alcohols and the like exemplified in the description of the ester (A-2) above are preferably used. The carbon number of the monohydric alcohol is preferably 6 or more, more preferably 8 or more, and still more preferably 10 or more from the viewpoint of more excellent lubricity. In addition, if the carbon number is too large, stinning and corrosion may occur.Therefore, the carbon number of monovalent alcohol is preferably 20 or less, more preferably 18 or less, still more preferably 16 or less. .

[0056] (A-4) The fatty acid may be either a monobasic acid or a polybasic acid, or a mixture thereof. Examples of the monobasic acid and polybasic acid include the monobasic acid and polybasic acid exemplified in the description of the above (A2) ester. Of these, monobasic acids are preferred because of their superior lubricity, and the fatty acid has a carbon number of 6 or more, preferably 8 or more, more preferably 10 or more, because of its superior lubricity. Even better. On the other hand, if the carbon number of the fatty acid is too large, the carbon content of the carboxylic acid may be increased because the residual oil content in the pipe after annealing may increase or the adverse effect of the residue after annealing on the refrigeration system may increase. Is preferably 20 or less, more preferably 18 or less, still more preferably 16 or less.

[0057] In the lubricating oil composition of the present invention, only one of the above oil agents (A-1) to (A-4) may be used alone, or two or more may be used in combination. However, since the lubricity can be further improved, monohydric alcohols and monobasic acids can be combined with esters of C7 to C26, monohydric alcohols of C6 to C20, and monobasic acids of C6 to C20. , As well as a mixture of two or more of these.

[0058] The total content of the oil agents (A-1) to (A-4) is 40% by mass or less, preferably 20% by mass or less, more preferably 10% by mass or less, as described above, based on the total amount of the composition. % By mass or less. If the content exceeds 40% by mass, residual oil in the tube will increase its strength!]. Further, the total content of oily material _(A- 1) ~ _(A one _4), the total amount of the composition, as described above 0.5 and 5 mass% or more, preferably 0.7 mass% or more, more It is preferably at least 1% by mass. If the content is less than 0.5% by mass, sufficient lubricity cannot be obtained.

[0059] In the lubricating oil composition of the present invention, in order to further improve its excellent effects, If necessary, additives such as extreme pressure additives, antioxidants, rust inhibitors, corrosion inhibitors, defoamers and the like may be further contained alone or in combination of two or more.

[0060] Examples of extreme pressure additives include phosphorus compounds such as tricresyl phosphate and organometallic compounds such as zinc dialkyldithiophosphate. Examples of the antioxidant include phenolic compounds such as 2,6-di-tert-butyl p-talesol (DBPC), aromatic amines such as phenol-naphthylamine, and organic metal compounds such as zinc dialkyldithiophosphate. Can be Examples of the rust inhibitor include salts of fatty acids such as oleic acid, sulfonates such as dinonylnaphthalene sulfonate, partial esters of polyhydric alcohols such as sorbitan monooleate, amines and derivatives thereof, and phosphate esters and derivatives thereof. Are listed. Examples of the corrosion inhibitor include benzotriazole and the like. Examples of the antifoaming agent include silicone-based ones.

[0061] The total content of the above additives is preferably 15% by mass or less, more preferably 10% by mass or less, based on the total amount of the composition.

The kinematic viscosity of the lubricating oil composition of the present invention is not particularly limited, but the kinematic viscosity at 40 ° C. is preferably 30 to 6000 mm ² Zs, more preferably 50 to 6000 mm ² Zs, and further preferably 80 60006000 mm ² Zs, particularly preferably 100 to 5000 mm ² Zs. If the kinematic viscosity is less than 30 mm ² Zs, the amount of oil remaining in the tube after annealing tends to increase, and lubricity tends to decrease. On the other hand, if the kinematic viscosity is high such as exceeding 6000 mm ² Zs, the residual oil amount in the pipe after annealing may increase.

[0063] The lubricating oil composition for aluminum pipe processing of the present invention having the above-described structure is capable of exhibiting excellent lubricity in drawing, rolling and the like, and has a high heating temperature in the annealing step. Exhibit sufficient thermal decomposability and vaporization characteristics. Therefore, according to the present invention, it is possible to reduce the residual oil in the long and coiled aluminum tube at low cost without performing a special residual oil removal treatment such as purging in an annealing furnace, and as a result, In addition, it is possible to sufficiently prevent the seizure during drawing or rolling, improve the brazing property of the aluminum pipe, and prevent the residual oil in the pipe after annealing or its carbide from being mixed into the refrigeration system. Good luck.

[0064] Heat exchange of a refrigeration system to which the lubricating oil composition for processing aluminum pipes of the present invention is applied. As for the refrigerant used for the heater and the like, HFC-based refrigerant and a mixed refrigerant of HFC-based refrigerant and hydrocarbon (HC refrigerant) are exemplified.

As HFC-based refrigerants, fluorinated alkanes (HFCs) having 1 to 3 carbon atoms are known. Specifically, difluoromethane (HFC-32), trifluoromethane (HFC-23), and pentane Fluoroethane (HFC-125), 1, 1, 2, 2-Tetrafluorene (HFC-134), 1, 1, 1, 2-Tetrafluorene (HFC-134a), 1, 1, 1 -Hydrofluorocarbon (HFC) such as trifluorethane (HFC 143a) and 1,1-difluoroethane (HFC-152a), and mixtures of two or more thereof can be used.

[0066] The mixed refrigerant HFC refrigerant, for example, 60 to 80 wt% of HFC 134a and mixed refrigerants with HFC 32 of 20-40 mass ^_0/0, from 40 to 70 weight ^_0/0 HFC 32 and 30 to 60 wt% of HFC 125 with refrigerant mixing, 40 to 60 weight ^_0/0 of HFC 125 and 40 to 60 weight ^_0/0 mixed refrigerant of HFC 143a, and 60 mass ^_0/0 of HFC - 134a and 30 weight ^_0/0 HFC 32 and 1 0 mass ⁰ / refrigerant mixture with ₀ of HFC 125, from 40 to 70 weight ^_0/0 HFC 134a and 15 to 35 mass ^_0/0 of HFC - 32 mixed refrigerant of 5 to 40 mass ^_0/0 of HFC 125, and 35 to 55 wt% HFC 125 and 1-15 weight ^_0/0 HFC 134a and 40 to 60 weight ^_0/0 A mixed refrigerant with HFC-143 can be used.

[0067] Further, in the present invention, the refrigerating machine oil used in the refrigerating system, that is, the compressor oil in the refrigerating system, is at least one selected from the group consisting of mineral oil and synthetic oil, if necessary. What added various additives can be used.

[0068] As the mineral oil used as the refrigerating machine oil, specifically, for example, a lubricating oil fraction obtained by distilling a crude oil under normal pressure and reduced pressure is subjected to solvent removal, solvent extraction, and hydrocracking. A paraffinic or naphthenic mineral oil obtained by combining one or more of the solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing and clay treatments can be used.

[0069] Further, as the synthetic oil used as the refrigerator oil, specifically, for example, the ability to use synthetic oxygenated oil such as polyolefin, alkylbenzene, ester, ether, silicate and polysiloxane, Preference is given to using polyolefins, alkylbenzenes, esters and ethers. [0070] Among synthetic oils used as refrigerating machine oils, polyolefins include homoolefins and copolymers of olefins having 2 to 16 carbon atoms, preferably 2 to 12 carbon atoms, and hydrogens thereof. A compound. When this polyolefin is a copolymer of olefins having different structures, there are no particular restrictions on the monomer ratio and monomer arrangement in the copolymer, and random copolymers, block copolymers, and alternating copolymers are not limited. Any of coalescence may be used.

[0071] The olefin monomer forming the polyolefin may be a olefin, an internal olefin, a linear olefin, or a branched olefin. .

Examples of the olefins that can be used in the production of polyolefin include, for example, ethylene, propylene, 1-butene, 2-butene, isobutene, linear or branched pentene (α-olefin). O-olefins and internal olefins), linear or branched hexenes-including olefins and internal olefins, linear or branched heptene (including a-olefins and internal olefins), linear or Branched otaten (including olefins and internal olefins), linear or branched nonene-olefins and internal olefins, linear or branched decene (including olefins and internal olefins) Fin), linear or branched ndene (including α-olefin and internal olefin), linear or branched dodecene (α-olefin) Straight-chain or branched tridecene (including α-olefin and internal olefin), straight-chain or branched tetradecene (including α-olefin and internal olefin), and straight-chain or branched tridecene (including α-olefin and internal olefin). Examples thereof include linear or branched pentadecene (including α-olefin and internal olefin), and linear or branched hexadecene (including α-olefin and internal olefin), and mixtures thereof.

[0073] In particular, ethylene, propylene, 1-butene, 2-butene, isobutene and a-olefins having 5 to 12 carbon atoms, and 5 to 12 carbon atoms are preferable to use a mixture thereof. It is even more preferred to use, among α-olefins, 1-otaten, 1-decene and 1-decene, and mixtures thereof.

[0074] The above-mentioned polyolefin can be produced by any method. For example, in addition to being able to be produced by a thermal reaction without a catalyst, a known organic peroxide such as benzoyl peroxide can be used. Polyolefin can be produced by homopolymerizing or copolymerizing olefins using an oxide catalyst. Examples of the organic peroxide catalyst include Friedel-Crafts catalysts such as aluminum chloride, aluminum chloride, polyhydric alcohol, aluminum chloride titanium tetrachloride, aluminum chloride alkyltin halide, and boron fluoride. There is. Further, Ziegler type catalysts such as organic chloride aluminum titanium tetrachloride titanium and organic aluminum tetrachlorosilane titanium can be used. Further, using known catalyst systems such as aluminoxane-zirconocene-based, ionic compound-zirconocene-based catalysts such as meta-open-side catalysts, and Lewis acid complex-based catalysts such as aluminum chloride base-based and boron fluoride base-based catalysts, Orefin can be homopolymerized or copolymerized.

[0075] In the present invention, the above-mentioned polyolefin can be used as a component of the refrigerating machine oil. However, since this polyolefin usually has a double bond, it has thermal stability and acid stability. Considering the properties, a hydride of polyolefin obtained by hydrogenating a double bond in a polymer may be used. As a method for obtaining a polyolefin hydride, an appropriate method can be used.For example, a polyolefin is hydrogenated with hydrogen in the presence of a known hydrogenation catalyst to saturate a double bond present in the polyolefin. The method can be used. In addition, by selecting the catalyst to be used, after polymerizing the olefin, the two steps of hydrogenation are sequentially performed. The polymerization step of the olefin and the hydrogenation step of the double bond present in the polymer are not performed. The steps can be performed simultaneously.

[0076] In addition, among the synthetic oils used as refrigerating machine oils, any alkyl benzene can be used. For example, alkyl benzene having 1 to 4 alkyl groups having 1 to 40 carbon atoms can be used. Can be used. Examples of the alkyl group having 1 to 40 carbon atoms include, for example, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, Pendecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, icosyl, henycosyl, docosyl, tricosyl, tetracosyl, pentacosyl, Hexacosyl group, heptacosyl group, otacosyl group, nonacosyl group, triacontyl group, hentriacontyl group, dotriacontyl Group, tritriacontyl group, tetratriacontyl group, pentatriacontyl group, hexatriacontyl group, heptatriacontyl group, octatriacontyl group, nonatriacontyl group, and a tetracontyl group. For those having a form, alkylbenzenes, including all isomers, can be used as synthetic oils.

[0077] The alkyl group of the alkylbenzene may be linear or branched. From the viewpoints of force stability, viscosity characteristics, and the like, an alkylbenzene having a branched alkyl group may be used. Preferably, it is used as a synthetic oil. Among them, particularly, alkylbenzene having a branched alkyl group derived from oligomers of olefins such as propylene, butene and isobutylene is preferably used as a refrigerating machine oil because it is easily available.

[0078] The number of alkyl groups in the alkylbenzene is preferably 1 to 4, but from the viewpoint of stability and availability, a monoalkylbenzene having one alkyl group and two alkyl groups are preferred. The dialkylbenzenes and mixtures thereof can be used as refrigerating machine oil. In addition, the alkylbenzene may be a mixture of alkylbenzenes having different structures that are different from a single structure of alkylbenzene.

Further, the method for producing alkylbenzene is not limited, but can be generally synthesized by the following synthesis method. As the aromatic compound as a raw material, specifically, for example, benzene, toluene, xylene, ethylbenzene, methylethylbenzene, getylbenzene, a mixture thereof and the like can be used. Examples of the alkylating agent include, among lower monoolefins such as ethylene, propylene, butene, and isobutylene, preferably linear or branched olefins having 6 to 40 carbon atoms obtained by polymerization of propylene. Can be used. In addition, linear or branched Colefin having 6 to 40 carbon atoms obtained by thermal decomposition of pettus, heavy oil, petroleum fraction, polyethylene and polypropylene, and petroleum fraction such as kerosene and gas oil It is also possible to use linear olefins having 9 to 40 carbon atoms obtained by separating n-paraffin and orienting the n-paraffin with a catalyst, or a mixture of these olefins. Further, examples of the alkylidani catalyst used in the alkylidani are Friedel-Crafts type catalysts such as aluminum chloride and zinc chloride, and sulfuric acid, phosphoric acid, kytungstic acid, hydrofluoric acid and the like. Known alkylation catalysts such as acid catalysts such as clay can be used.

[0081] Among the synthetic oils used as refrigerating machine oil, esters include dibasic acid esters, polyol esters, complex esters and carbonate esters. Esters that can be used as a component of refrigerating machine oil are substantially equivalent to polybasic acids such as dibasic acids and polyhydric alcohols as acids and alcohols constituting the ester. It shows only those which are all esterified and does not include partial esters in which carboxyl groups, hydroxyl groups and the like remain without being esterified.

Examples of the dibasic acid ester include dibasic acids having 5 to 10 carbon atoms, such as daltalic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid, and methanol, ethanol, Linear or branched propanol, linear or branched butanol, linear or branched pentanol, linear or branched hexanol, linear or branched Heptanol, linear or branched octanol, linear or branched nonanol, linear or branched decanol, linear or branched pendanol, linear Or branched dodecanol, linear or branched tridecanol, linear or branched tetradecanol, linear or branched pentadecanol, linear or branched to Xadenol, linear or branched heptadecanol, straight Linear or branched nonadecanol, linear or branched icosanol, linear or branched icosanol, linear or branched henicosanol, linear or branched Monohydric alcohols having 1 to 24 carbon atoms having a linear or branched alkyl group such as docosanol, linear or branched tricosanol and linear or branched tetracosanol. Esters and mixtures thereof can be used, and specifically, ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate and di 2-ethylhexyl sebacate, and mixtures thereof, and the like can be used. It can be used.

[0083] Among the esters used as refrigerating machine oil, polyol esters include diols. Alternatively, it is preferable to use an ester of a polyol having 3 to 20 hydroxyl groups and a fatty acid having 6 to 20 carbon atoms. Specific examples of the diol include ethylene glycol, 1,3 propanediol, propylene glycol, 1,4 butanediol, 1,2 butanediol, 2-methyl-1,3 propanediol, 1,5 pentanediol, Neopentyl glycol, 1,6-hexanediol, 2-ethyl-2-methyl-1,3-propanediol, 1,7 heptanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2 Jethyl-1,3-propanediol, 1 , 8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-decanediol, and 1,12-dodecanediol.

[0084] Specific examples of the polyol having 3 to 20 hydroxyl groups include trimethylolethane, trimethylolpropane, trimethylolbutane, di (trimethylolpropane), tri- (trimethylolpropane), and pentaerythritol. , Di- (pentaerythritol), tri- (pentaerythritol), glycerin, polyglycerin (2 to 20-mer of glycerin), 1,3,5-pentanetriol, sorbitol, sorbitan, sorbitol glycerin condensate, adnitol , Arabitol, xylitol and polyhydric alcohols such as mantol; and xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sonorebose, cellobiose, manoletothose, isomaretoose, toreno. Loin, sucrose, raffinose, gentianose and melezitose like sugars, and their partially etherified products, as well as and methyl Darco Sid (glycoside).

[0085] Specific examples of the fatty acid having 6 to 20 carbon atoms include pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and tetradecanoic acid Linear or branched ones such as pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic acid, icosanoic acid, and oleic acid; and a-carbon nuclear grade neo acids.

[0086] More specifically, valeric acid, isopentanoic acid, capric acid, pelargonic acid, 2-methylhexanoic acid, 2-ethylpentanoic acid, capryprilic acid, 2-ethylhexanoic acid, normal nonanoic acid, 5, 5-trimethylhexanoic acid and the like. Some polyol esters have a free hydroxyl group. Incidentally, particularly preferably, neopentyldaricol, trimethylo Hindered alcohols such as mono-oleethane, trimethylonolepropane, trimethylonolebutane, gee (trimethylololepronone), tree (trimethylolpropane), pentaerythritol, gee (pentaerythritol), and tri- (pentaerythritol) Is an ester of Specifically, neopentyl glycol 2-ethylhexanoate, trimethylolprononcaprylate, trimethylolpropaneperargonate, pentaerythritolone 2-hexylhexanoate, and pentaerythritol pelargonate, and mixtures thereof There are things.

[0087] Among the esters used as refrigerator oil, complex esters are esters of fatty acids and dibasic acids with monohydric alcohols and polyols, and include fatty acids, dibasic acids, monohydric alcohols and polyols. As the dibasic acid ester and the polyol ester, the same ones as those exemplified for the dibasic acid ester and the polyol ester can be used.

[0088] The carbonic acid ester is an ester of carbonic acid with a monohydric alcohol and a polyol. The monohydric alcohol and the polyol are the same as those described above, and homopolymerized or copolymerized with alkylene oxide. Polymerized polydalicol and those obtained by adding polyglycol to the above-mentioned polyols can be used.

[0089] Examples of ethers that can be used as a refrigerating machine oil include polydalicol, polybutyl ether, polyphenol ether, cyclic ether and perfluoroether. 1S Among these ethers, polyglycol and polybutyl ether and the like are mentioned. It is preferable to use them.

As the polyglycol, it is preferable to use a polyalkylene glycol and an etherified product thereof, and a modified product thereof. As the polyalkylene glycol, those obtained by homopolymerizing or copolymerizing alkylene oxides such as ethylene oxide, propylene oxide and butylene oxide can be used. In the case of polyalkylene glycol, when alkylene oxides having different structures are copolymerized, block copolymerization may be performed even if random polymerization is not particularly limited as to the polymerization form of the oxyalkylene group. You may.

[0091] The etherified polyalkylene glycol is obtained by etherifying the hydroxyl group of the above-described polyalkylene glycol. As etherified polyalkylene glycol Specifically, monomethyl ether, monoethyl ether, monopropyl ether, monobutynoleate, monopentinoleate, monohexinoleate, monoheptinoleate, monootinoleate, monononatele and monononinoleate Tenoré, monodecinoleatenole, dimethinole ether, dichinoleate ether, dipropyl ether, dibutinoleatel, dipentinole ethere, dihexinooleatene, diheptinoleatenole, dioctinoleatenole, dinonile ether and dinotene Decyl ether and the like.

[0092] Examples of the modified compound of polydalicol include carohydrates of polyols with alkylene oxides, and ethereal teres thereof. As this polyol, the same polyols as those exemplified for the polyol ester can be used.

[0093] Further, as the polybutyl ether, those having a structural unit represented by the following general formula (1) can be used.

[0094] [Formula 1]

In the general formula (2), R ⁴ , R ⁵ and R ⁶ each represent a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms which may be the same or different, and R ⁷ represents 2 carbon atoms. Represents a divalent hydrocarbon group of 1010, R ⁸ represents a hydrocarbon group having 1 to LO carbon atoms, and p represents an integer such that the average force of the whole molecule is 〜10. R ^{4 to} R ⁸ may be the same or different for each structural unit. Further, R ⁷ - If O there is a plurality, that is, when p is 2 or more, plural R ⁷ - O is even that being the same or different! /.

[0096] Among these refrigerating machine oils, when an oxygen-containing synthetic oil is used, the residue in the aluminum tube after annealing has a large effect on the refrigeration system. Use of processing lubricating oils can provide significant effects.

Example

[0097] Hereinafter, the present invention will be described more specifically based on Examples and Comparative Examples. The present invention is not limited to the following examples.

[Examples 1 to 10, Comparative Examples 1 to 6]

In Examples 1 to 10 and Comparative Examples 1 to 6, lubricating oil compositions having the compositions shown in Table 1 were prepared using the base oils and additives described below, respectively.

(Base oil)

Base oil 1: polybutene (kinematic viscosity at 40 ° C: 5500 mm ² Zs, number average molecular weight: 1000, infrared absorbance at 12 30 cm ^_ 1: 0.030)

Base Oil 2: Polybutene (kinematic viscosity at 40 ° C: 5300mm ² Zs, the number-average molecular weight: 1060, 12 infrared absorbance at 30cm ^{_ 1 1:} 0. 020)

Base oil 3: Polybutylene recall (Kinematic viscosity at 40 ° C: 317 mmVs, number average molecular weight: 2000)

Base oil 4: Mineral oil (Kinematic viscosity at 40 ° C: 300mm ² Zs)

Base oil 5: poly atolefin (kinematic viscosity at 40 ° C: 330 mm ² Zs, number average molecular weight: 2000)

(Additive)

A1: Glycerin monooctyl ether

A2: Putinole stearate

A3: Lauryl alcohol

A4: Lauric acid.

[0099] Next, the following tests were performed on the lubricating oil compositions of Examples 1 to 10 and Comparative Examples 1 to 6.

[0100] [Lubricity: Bowden test]

A ball-on-plate reciprocating sliding test (Bauden test) was performed under the following test conditions.

And the coefficient of friction was measured. Table 1 shows the obtained results.

Feeding speed: lOOmmZmin

Load: 200kg

Ball (upper test ball): 5Z32inch steel ball (SUJ-2)

Plate (lower test plate): A3003 material plate (aluminum) Test temperature: room temperature.

[0101] [annealability]

The residual carbon content was measured by the Conradson method of JIS K 2270 "Crude oil and petroleum products-Test method for residual carbon content". Table 1 shows the obtained results.

[0102] [Stability of annealing residue]

The following tests were performed to evaluate the stability of the annealing residue to refrigerator oil. First, a catalyst (iron wire, lead wire, aluminum wire with a thickness of 1.6 mm and a length of 50 mm) based on JIS K 2211 “Refrigerator oil”, Annex 2 “Test method for chemical stability with refrigerant (shielded glass tube test)” ) Was prepared, and the catalyst was immersed in the sample oil. The catalyst with the sample oil adhering to the surface in this way was placed in a thermostat at 300 ° C and held for 30 minutes. This catalyst is placed in a glass tube with an inner diameter of 10 mm and a wall thickness of lmm, and 1 ml of refrigerating machine oil (polypropylene glycol, kinematic viscosity at 40 ° C: 46 mm ² Zs) and refrigerant HFC-134alml are sealed, and the upper part of the glass tube is sealed. Fused and sealed. After keeping the sealed glass tube at 175 ° C for 14 days, the appearance of the catalyst and the presence or absence of sludge were observed. Table 1 shows the obtained results. In the column of “Appearance of catalyst” in Table 1, A means “no change”, B means “discoloration is recognized”, and C means “corroded”.

[0103] [Table 1]

Annealing residue base; Field additive Lubricity Annealability

Stability

3 Yes 3 Yes: m; Coefficient of friction Residual coal Catalyst Type Type Sludge

(Mass%) (mass ¾) U (mg) Appearance Example 1 Base oil 1 95 A1 5 0.081 0.01 A None Example 2 Base oil 1 90 A2 10 0.098 0.02 A None Example 3 Base oil 1 90 A3 10 0.093 0.01 A None Example 4 Base oil 1 99 A4 1 0.089 0.09 B None Example 5 Base oil 3 95 A1 5 0.079 0.01 A None Example 6 Base oil 3 90 A2 10 0.093 0.02 A None Example 7 Base oil 3 90 A3 10 0.089 0.01 A None Example 8 Base oil 3 99 A4 1 0.085 0.08 B None

A1 5

Example 9 Base oil 3 85 0.076 0.00 A None

A3 10

Example 10 Base oil 2 90 A3 10 0.092 0.31 B No Comparative example 1 Base oil 4 95 A1 5 0.112 1.21 C Yes Comparative example 2 Base oil 5 95 A1 5 0.091 1.13 C Yes Comparative example 3 Base oil 1 100--0.213 0.00 A None Comparative example 4 Base oil 3 100--0.205 0.00 A None Comparative example 5 Base oil 3 99.8 A1 0.02 0.192 0.00 A None Comparative example 6 Base oil 3 50 A1 50 0.075 0.89 B Available

Claims

The scope of the claims

[1] Polybutene and polyalkylene glycol power At least one selected from base oils,

It is characterized in that it contains 0.5 to 40% by mass, based on the total amount of the composition, of at least one oily agent selected from partial ether compounds, esters, alcohols and fatty acids of dihydric or higher polyhydric alcohols. Lubricating oil composition for processing aluminum pipes.