JP2009185100A - Lubricant composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricant composition which is suitable for use as a fluorine oil or a fluorine grease and has excellent rust-preventive properties while having heat resistance. <P>SOLUTION: The lubricant composition consists of a fluorine-containing diamide compound represented by general formula (I) and a lubricating oil, and has excellent rust-preventive properties. In general formula (I), Y represents oxygen (O), sulfur (S), CO, SO, or SO<SB>2</SB>; k is an integer of 1-5; m is an integer of 0-10; n is an integer of ≥1, and the substitution positions of the two substituents possessed by each phenyl group may be any of ortho, meta, and para. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lubricant composition, and more particularly to a lubricant composition that is suitable for fluorine oil and fluorine grease and has excellent rust prevention properties.

  Fluorine-based lubricants are widely used to lubricate various machines such as automobiles, electrical equipment, construction machines, information equipment, industrial machines, machine tools, and parts constituting them. In recent years, the temperature of these peripheral devices tends to rise as the speed, size, performance, and weight of these machines increase.

  In addition, the use of equipment in coastal areas and the requirement of lubricants to prevent rust when parts are transported overseas are required. In addition, low friction and wear resistance are required to improve production efficiency and reduce maintenance intervals. In particular, rust prevention characteristics are required for the reason that it is desired to use it stably in a contact environment with a member having a rust.

  In Patent Document 1, a fluorine grease composition has been developed for rolling bearings that are excellent in rust prevention performance in addition to durability at high temperatures, and a magnesium compound and a vaporizable rust inhibitor are added to the grease composition. ing. In the examples, benzotriazole is mainly used as the vaporizable rust preventive used, and it has succeeded in providing rust preventive performance, but the vaporizable rust preventive used. The agent benzotriazole is susceptible to thermal degradation, and when used at high temperatures, it causes a reduction in the life of the lubricant itself. Moreover, since the solubility to fluorine oil is low, it cannot be diverted to fluorine oil.

  Patent Document 2 discloses a carboxyl group and an amide derivative as an additive having high solubility in fluorine oil. Certainly, carboxyl group and amide group make a metal protective film and improve rust prevention performance, but lack thermal stability, so when used at high temperature, rust prevention effect cannot be exhibited continuously.

  Patent Document 3 discloses a fluorine grease to which a carboxylic acid derivative containing a disodium sebacate, sodium carbonate, and a perfluoropolyether chain is added as an anticorrosive additive for use from a low temperature to a high temperature. While these additives can certainly improve rust prevention performance, they are not sufficient for high-temperature fluorine oil and grease applications from the viewpoint of solubility in fluorine oil and heat resistance.

  In Patent Document 4, rust prevention is imparted by a compound containing a perfluoropolyether chain having an aryltriazine end group.

  However, the synthesis process of the compound has three stages and is not suitable for scaling up to an industrial scale.

In addition, for example, in the reaction of trichlorotriazine and HOCH ₂ CF ₂ (OCF ₂ ) _d (OCF ₂ CF ₂ ) _c OCF ₂ CH ₂ OH to obtain the compound of Example 1, a plurality of by-products are likely to be generated. Therefore, it is necessary to strictly control the reaction conditions, and it is difficult to obtain the target product with good yield.
JP 9-59664 A Japanese Patent No. 2818242 JP 2006-348291 A JP 2006-290892 A

  Accordingly, an object of the present invention is to provide a lubricant composition that is suitable for fluorine oil and fluorine grease and has excellent rust prevention properties while having heat resistance.

  The other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

(Claim 1)
A lubricant composition excellent in rust prevention comprising a fluorine-containing diamide compound represented by the following general formula (I) and a lubricating oil.
Formula (I)

Wherein, Y is an oxygen atom (O), sulfur atom (S), CO group, a SO group, or a SO ₂ group, k is an integer from 1 to 5, m is an integer of 0, n is an integer of 1 or more. The substitution positions of the two substituents in the phenyl group may be any of the ortho, meta, and para positions. ]

(Claim 2)
The lubricant composition according to claim 1, wherein, in the general formula (I), Y is an oxygen atom (O) or a sulfur atom (S).

(Claim 3)
The lubricating oil, kinematic viscosity (40 ℃) 5~2000mm ² / s according to claim 1 or 2 lubricant composition according comprising a perfluoropolyether oil.

(Claim 4)
The lubricant composition according to claim 1, 2 or 3, comprising a thickener.

(Claim 5)
The lubricant composition according to claim 4, wherein the thickener is fine particles having an average primary particle size of 0.01 to 50 μm, and the particles contain at least one selected from fluororesin, silica, graphite, and carbon.

(Claim 6)
The lubricant composition according to claim 4 or 5, wherein the thickener comprises at least one selected from metal soap, metal composite soap, urea, and aliphatic dicarboxylic acid metal salt.

(Claim 7)
The lubricant composition according to any one of claims 1 to 6, which is used for a bearing, a gear, a linear guide or a magnetic disk.

  According to the present invention, it is possible to provide a lubricant composition which is suitable for fluorine oil or fluorine grease and has excellent rust prevention properties.

  Embodiments of the present invention will be described below.

  The lubricant composition of the present invention comprises a fluorine-containing diamide compound (additive) represented by the above general formula (I) and a lubricating oil (base oil).

<Fluorine-containing diamide compound represented by formula (I)>
In general formula (I), Y represents an oxygen atom (0), a sulfur atom (S), a CO group, a SO group or a SO ₂ group, preferably an oxygen atom (0) or a sulfur atom (S).

  k is an integer of 1 to 5, preferably an integer of 1 to 3.

  m is an integer of 0 to 10, preferably in the range of 1 to 5, and more preferably 1 or 2. When m exceeds 10, the viscosity of the additive becomes high and it becomes insoluble in the intended base oil.

  n is an integer greater than or equal to 1, Preferably it is the range of 2-40. When n is less than 1, the amount of evaporation increases in the high temperature range, but the height of the rust prevention effect does not change. There is also a problem that it does not dissolve in the base oil.

  The substitution positions of the two substituents in the phenyl group may be any of the ortho, meta, and para positions.

  Since a high antirust effect can be obtained by adding the compound, it is possible to omit the antirust agent among additives generally used for lubricants based on synthetic oils.

  The fluorine-containing diamide compound represented by the general formula (I) includes, for example, an acid fluoride compound represented by the following general formula (II) and a compound having a diamino group represented by the following general formula (III) in a pyridine solvent. It can be synthesized by reaction.

Formula (II)

  In formula, n is an integer greater than or equal to 1, Preferably it is the range of 2-40.

General formula (III)

In the formula, Y represents an oxygen atom (0), a sulfur atom (S), a CO group, an SO group or a SO ₂ group, and preferably an oxygen atom (0) or a sulfur atom (S).

  m is an integer of 0 to 10, preferably in the range of 1 to 5, and more preferably 1 or 2.

  The substitution positions of the two substituents in the phenyl group may be any of the ortho, meta, and para positions.

  In the above synthesis method, since the reaction is performed in a pyridine solvent, there is no problem like sodium fluoride because a hydrogen fluoride trapping ability similar to sodium fluoride is used and a low toxicity substance (pyridine) is used. .

  The pyridine toxicity and properties are as follows.

Oral rat toxicity: LD50 890mg / kg
Liquid at normal temperature (melting point -42 ° C, boiling point 115.5 ° C)

  The solvent pyridine need not be singular, and other organic solvents may be used in combination to improve the solubility of the raw material compounds and reaction products.

  Examples of the compound having a diamino group represented by the general formula (III) include 1,4-bis (4-aminophenoxy) benzene, and such 1,4-bis (4-aminophenoxy) benzene is a CAS No. . It can be obtained from commercial products such as 10526-07-5, 2479-46-1, 3491-12-1.

The compound having a diamino group may be an aromatic polyether having m = 2 or more, and further, a compound in which each ether bond atom O (oxygen atom) is replaced by CO, S, SO, SO ₂ (for example, CAS No. 141699-34-5, 60191-34-6, 17619-11-3).

  In addition, although the said synthesis method is a method when k is 3 in the compound shown by general formula (I), it can synthesize | combine similarly even if it uses the acid fluoride body from which k differs. Again, it is important to use a pyridine solvent.

<Lubricating oil>
As the lubricating oil in the present invention (hereinafter sometimes referred to as a base oil if necessary), a perfluoropolyether oil represented by the following general formula (IV) can be preferably used.

Formula (IV)
_{RfO (CF 2 O) f (} C 2 F 4 O) g (C 3 F 6 O) h Rf

  In the above formula, Rf represents a perfluoro lower alkyl group having 1 to 5 carbon atoms such as a perfluoromethyl group and a perfluoroethyl group.

  Among the perfluoropolyether oils represented by the general formula (IV), the perfluoropolyether oils represented by the following general formulas (V) to (VIII) are exemplified as specific compounds.

General formula (V)
RfO [CF (CF ₃ ) CF ₂ O] _i Rf

  In said formula, Rf is the same as the said definition, and i is an integer of 2-200.

The perfluoropolyether oil represented by the general formula (V) is obtained by completely fluorinating a precursor produced by photo-oxidation polymerization of hexafluoropropylene or by converting hexafluoropropylene into an anion under a cesium fluoride catalyst. The acid fluoride compound having a terminal CF (CF ₃ ) COF group obtained by polymerization is obtained by treatment with a fluorine gas.

General formula (VI)
_{F (CF 2 CF 2 CF 2} O 2) 2~100 CF 2 CF 3

The perfluoropolyether oil represented by the general formula (VI) is obtained by anionic polymerization of 2,2,3,3-tetrafluorooxetane in the presence of a cesium fluoride catalyst, and the resulting fluorinated polyether (CF ₂ It can be obtained by treating CF ₂ CF ₂ O) n with fluorine gas under ultraviolet irradiation at 160 to 300 ° C.

Formula (VII)
RfO (CF ₂ CF ₂ O) _j (CF ₂ O) _k Rf

  In the above formula, Rf is the same as the above definition, j + k = 3 to 200, and j: k = 10: 90 to 90:10 are randomly combined.

  The perfluoropolyether oil represented by the general formula (VII) can be obtained by completely fluorinating a precursor produced by photo-oxidative polymerization of tetrafluoroethylene.

Formula (VIII)
RfO [CF (CF ₃ ) CF ₂ O] _l (CF ₂ O) _m Rf

  In the above formula, Rf is the same as defined above, and is randomly bonded at 1 + m = 3 to 200 and 1: m = 10: 90.

  The perfluoropolyether oil represented by the general formula (VII) can be obtained by completely fluorinating a precursor produced by photo-oxidative polymerization of hexafluoropropene.

  These perfluoropolyether oils (base oils) can be used alone or in combination.

In the present invention, a preferred perfluoropolyether oil is a perfluoropolyether oil having a kinematic viscosity (40 ° C.) of 5 to 2000 mm ² / s when used as a lubricating oil. Here, the kinematic viscosity is measured according to JIS K-2283 (Canon-Fenske viscometer).

Those with less than 5 mm ² / s have a large evaporation amount and do not satisfy the condition of the evaporation amount (1.5% or less) stipulated in the JIS rolling bearing grease type 3 which is a rule for heat-resistant grease. On the other hand, if it exceeds 2000 mm ² / s, the pour point (JIS K-2283) becomes 10 ° C. or higher, and the bearing does not rotate at the time of low temperature start in the normal method, and it is necessary to heat it to be able to use it. As a general grease, it becomes lacking in eligibility for use. A more preferable range of the viscosity (40 ° C.) is about 10 to 1500 mm ² / s.

<Combination ratio>
The composition containing the perfluoropolyether oil (base oil) as described above and the fluorine-containing amide compound which is a novel primary amine derivative represented by the general formula (I) has a novel combination.

  The blending ratio of the fluorine-containing amide compound can be 0.1 to 20% by mass of the entire lubricant composition (oil composition), and particularly preferably 0.5 to 5% by mass. When it is less than 0.1% by mass, a sufficient effect as a lubricant cannot be obtained. Moreover, when it exceeds 20 mass%, the performance corresponding to cost performance cannot be demonstrated.

<Other base oils>
The lubricant composition of the present invention can be mixed with a base oil other than the above-mentioned perfluoropolyether oil. However, the oil cannot be used as it is because it separates even when mixed with perfluoropolyether oil. In this case, a thickener described later is blended and used as a grease.

  The type of oil other than perfluoropolyether oil is not particularly limited. However, poly-α-olefin, ethylene-α-olefin copolymer, polybutene, alkylbenzene, hydrocarbon synthetic oil represented by alkylnaphthalene, polyalkylene glycol , Various phenyl ether oils, monoesters, diesters, polyol esters (neopentyl glycol ester, trimethylolpropane ester, pentaerythritol ester, dipentaerythritol ester, complex ester, etc.), ester oils such as aromatic ester, carbonate ester, etc. Use at least one kind of silicone oil, synthetic oils such as various fluorine oils, paraffinic mineral oils, naphthenic mineral oils, or mineral oils obtained by appropriately combining these with solvent refining, hydrorefining, etc. Can be.

  There are no particular limitations on the types and properties of various lubricating base oils other than these perfluoropolyether oils, and they can be appropriately selected according to the conditions of use.

  The type of the lubricating oil (base oil) is preferably a synthetic oil having better heat resistance than mineral oil, more preferably an ester oil as a main component.

Regarding the properties, generally those having a kinematic viscosity (40 ° C.) of about ^{2 to} 1,000 mm ² / s, preferably about 5 to 500 mm ² / s are used. Here, the kinematic viscosity is measured according to JIS K-2283 (Canon-Fenske viscometer).

  Using a kinematic viscosity less than this range may cause a decrease in life, such as an increase in evaporation loss and a decrease in oil film strength, and may cause wear and seizure. In some cases, there is a possibility that power consumption and torque increase, such as an increase in viscous resistance.

<Thickener>
The lubricant composition of the present invention can be sufficiently used as a fluorine oil, but is effective as a grease in consideration of sealing properties. In this case, a thickener is blended.

  When used as a grease, polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropene copolymer (FEP), perfluoroalkylene resin or the like is used as a thickener.

  Polytetrafluoroethylene (PTFE) is polytetrafluoroethylene having a number average molecular weight Mn of about 1,000 to 1,000,000 by a method such as emulsion polymerization, suspension polymerization or solution polymerization of tetrafluoroethylene. A product having a number average molecular weight Mn of about 1,000 to 500,000, which is produced and processed by a method such as thermal decomposition, electron beam irradiation decomposition or physical pulverization, is used.

  In addition, the copolymerization reaction of tetrafluoroethylene and hexafluoropropene and the molecular weight reduction treatment in the production of tetrafluoroethylene-hexafluoropropene copolymer (FEP) are the same as in the case of polytetrafluoroethylene. And a number average molecular weight of about 1,000 to 600,000 is used. The molecular weight can be controlled using a chain transfer agent during the copolymerization reaction.

  The obtained powdery fluororesin is generally about 500 μm or less, preferably fine particles having an average primary particle size of 0.01 to 50 μm, and more preferably an average primary particle size of 0.1 to 30 μm.

  In this specification, the average particle diameter in the “average primary particle diameter” is an arithmetic average of the primary particle diameters of particles (100 or more) observed with an electron microscope. The primary particle size is the particle size of particles such as polytetrafluoroethylene in the form of minimum units that are not aggregated, and means the maximum particle size that can be measured between two opposing points of the diameter of each particle.

In the present invention, as the thickener, in addition to the fluororesin particles, silica (silicon dioxide), graphite, carbon, and further melamine cyanurate (MCA), which are fine particles having an average primary particle size of 0.01 to 50 μm, It is also preferable to use at least one selected from TiO ₂ (titanium oxide) or BN (boron nitride).

  Further, as thickeners other than the above, metal soaps such as Li soap, metal composite soaps, urea resins, minerals such as bentonite, organic pigments, polyethylene, polypropylene, and polyamide can also be used.

  From the viewpoint of heat resistance and lubricity, aliphatic dicarboxylic acid metal salts, monoamide monocarboxylic acid metal salts, monoester carboxylic acid metal salts, diurea, triurea, tetraurea and the like are desirable.

<Other additives>
As long as the object of the present invention is not impaired, a pour point depressant, an ashless dispersant, a metal detergent, and an antioxidant, which are used for lubricants based on general synthetic oils, if necessary. Well-known additives such as corrosion inhibitors, antifoaming agents, antiwear agents, and oiliness agents can be added depending on the application.

  When adding such an additive, it is desirable to make it the minimum necessary in order not to impair the heat resistance, low-temperature fluidity, and compatibility with the bearing material of the final product.

  Examples of the pour point depressant include di (tetraparaffin phenol) phthalate, a condensation product of tetraparaffin phenol, a condensation product of alkylnaphthalene, a chlorinated paraffin-naphthalene condensate, and an alkylated polystyrene.

  Examples of the ashless dispersant include succinimides, succinamides, benzylamines, and ester ashless dispersants.

  Examples of the metal detergent include a sulfonic acid metal salt represented by dinonylnaphthalene sulfonic acid, a metal salt of alkyl phonol, and a metal salt of salicylic acid.

  Examples of the antioxidant include phenols such as 2,6-di-t-butyl 4-methylphenol and 4,4′-methylenebis (2,6-di-t-butylphenol), and alkyldiphenylamines (alkyl groups). Is an amine antioxidant such as triphenyldiamine, phenyl-α-naphthylamine, phenothiazine, alkylated phenyl-α-naphthylamine, phenothiazine, alkylated phenothiazine, phosphorus antioxidant, sulfur System antioxidant etc. are mentioned, It can use individually or in mixture of 2 or more types.

  Examples of the corrosion inhibitor include benzimidazole, benzotriazole, thiadiazole and the like.

  Examples of the antifoaming agent include dimethylpolysiloxane, polyacrylic acid, metal soap, fatty acid ester, and phosphate ester.

  Antiwear agents include, for example, phosphorus compounds such as phosphate esters, phosphites and phosphate ester amine salts, sulfur compounds such as sulfides and disulfides, and chlorine compounds such as chlorinated paraffin and chlorinated diphenyl. And organic metal compounds such as zinc dialkyldithiophosphate (ZnDTP) and molybdenum dialkyldithiocarbamate (MoDTP).

  Examples of the oily agent include fatty acids, higher alcohols, polyhydric alcohols, polyhydric alcohol esters, aliphatic esters, aliphatic amines, fatty acid monoglycerides and the like.

  Examples of the present invention will be described below, but the present invention is not limited to such examples.

Example 1
Dissolve 29.5 g of 1,4-bis (4aminophenoxy) benzene in 200 ml of pyridine, slowly drop 124 g of acid fluoride (n = 1) on an ice bath, and stir overnight at 0 ° C. to room temperature. did.

After 50 ml of methanol was added and stirred, the mixture was neutralized with a saturated aqueous NaHCO ₃ solution.

Extraction was performed using AK-225 (mixture of CF ₃ CF ₂ CHCl ₂ and CCLF ₂ CF ₃ CHClF), and the mixture was washed with a saturated aqueous NaCl solution. AK-225 was distilled off with an evaporator to obtain a yellow powder (C-1) (124.8 g 99.1%).

  The chemical structure of C-1 was analyzed by NMR. As a result, it had the structure of the general formula (I), and n = 1, m = 1, and k = 3. By analogy with synthetic raw materials, Y is O (oxygen atom).

  2 g of the obtained yellow powder (C-1) was added to 198 g of the base oil (A-1) of the following formula, stirred and mixed at 80 ° C. for 30 minutes, and then cooled to obtain a cloudy solution.

(A-1)
_{Rf (CF 2 CF 2 O)} m (CF 2 O) n Rf
Rf: Perfluoro lower alkyl group Viscosity (40 ° C.): 160 mm ² / s

  This solution was subjected to a rust prevention test according to JIS K2246 (temperature 49 ° C., humidity 95%, 50 hours).

  According to the criteria shown in Table 1, the rust generation rate (%) after 50 hours was evaluated in five stages. The evaluation method is shown in Table 1. The results are shown in Table 2.

Example 2
10.1 g of 1,4-bis (4aminophenoxy) benzene is dissolved in a mixed solvent of 100 ml of pyridine and AK-225, and acid fluoride (n = 11 209.0 g) is slowly added dropwise at room temperature. The mixture was stirred overnight at 0 ° C.

After 50 ml of methanol was added and stirred, the mixture was neutralized with a saturated aqueous NaHCO ₃ solution.
Extracted with AK-225 and washed with saturated aqueous NaCl. AK-225 was distilled off with an evaporator to obtain a pale yellow high-viscosity liquid (C-2) (173.9 g 96.3%).

  The chemical structure of C-2 was analyzed by NMR. As a result, it had the structure of the general formula (I), and n = 11, m = 1, and k = 3. By analogy with synthetic raw materials, Y is O (oxygen atom).

  6 g of the obtained pale yellow high viscosity liquid (C-2) was added to 194 g of the base oil (A-1), stirred and mixed at 80 ° C. for 30 minutes, and then cooled to obtain a transparent solution.

  This solution was subjected to a rust prevention test in the same manner as in Example 1.

Example 3
2 g of 1,4-bis (4aminophenoxy) benzene is dissolved in a mixed solvent of 100 ml of pyridine and 100 ml of AK-225, and acid fluoride (n = 40 101.0 g) is slowly added dropwise at room temperature. The mixture was stirred overnight.

After 50 ml of methanol was added and stirred, the mixture was neutralized with a saturated aqueous NaHCO ₃ solution.
Extracted with AK-225 and washed with saturated aqueous NaCl. AK-225 was distilled off with an evaporator to obtain a pale yellow high-viscosity liquid (C-3) (97.6 g 99.6%).

  The chemical structure of C-3 was analyzed by NMR. As a result, it had the structure of the general formula (I), and n = 40, m = 1, k = 3. By analogy with synthetic raw materials, Y is O (oxygen atom).

  2 g of the obtained pale yellow high-viscosity liquid (C-3) was added to 198 g of the base oil (A-1), stirred and mixed at 80 ° C. for 30 minutes, and then cooled to obtain a transparent solution.

  About this solution, the rust prevention test was done like Example 1. FIG.

Example 4
A solution was obtained in the same manner as in Example 3 except that 196 g of base oil (A-2) represented by the following formula and 4 g of C-3 were used instead of A-1, and a rust prevention test was performed.

(A-2)
Rf [CF (CF ₃ ) CF ₂ ] _m (CF ₂ O) _n Rf
Rf: Perfluoro lower alkyl group Viscosity (40 ° C.): 400 mm ² / s

Example 5
A solution was obtained in the same manner as in Example 3 except that 190 g of base oil (A-3) of the following formula and 10 g of C-3 were used instead of A-1, and a rust prevention test was performed.

(A-3)
RfO [CF (CF ₃ ) CF ₂ O] _n Rf
Rf: Perfluoro lower alkyl group Viscosity (40 ° C.): 100 mm ² / s

Example 6
3 g of bis [4- (aminophenoxy) phenyl] sulfone was dissolved in a mixed solvent of 100 ml of pyridine and AK-225, and acid fluoride (n = 11 209.0 g) was slowly added dropwise at room temperature. Stir overnight under conditions.

After 50 ml of methanol was added and stirred, the mixture was neutralized with a saturated aqueous NaHCO ₃ solution.

  Extracted with AK-225 and washed with saturated aqueous NaCl. AK-225 was distilled off with an evaporator to obtain a pale yellow high viscosity liquid (C-4).

When the chemical structure of C-4 was analyzed by NMR, it had the structure of the general formula (I), and n = 11, m = 2, and k = 3. By analogy with synthetic raw materials, Y = SO ₂ group and O (oxygen atom).

  10 g of the obtained pale yellow high-viscosity liquid (C-4) was added to 190 g of the base oil (A-4) of the following formula, stirred and mixed at 80 ° C. for 30 minutes, and then cooled to obtain a transparent solution.

(A-4)
F [CF ₂ CF ₂ CF ₂ O] _m Rf
Viscosity (40 ° C.): 200 mm ² / s

  This solution was subjected to a rust prevention test in the same manner as in Example 1.

Example 7
2 g of (C-2) obtained in Example 2, 138 g of base oil (A-1), thickener (B-2: emulsion polymerization polytetrafluoroethylene, molecular weight of about 100,000 to 200,000, average primary After stirring and mixing 60 g (particle size 0.2 μm), the mixture was kneaded with three rolls to obtain a white grease-like substance.

  Using this grease-like substance as a sample, a rust prevention test was conducted in the same manner as in Example 1.

Comparative Example 1
Only the base oil (A-1) was subjected to a rust prevention test in the same manner as in Example 1.

Comparative Example 2
Only the base oil (A-2) was subjected to a rust prevention test in the same manner as in Example 1.

Comparative Example 3
Only the base oil (A-3) was subjected to a rust prevention test in the same manner as in Example 1.

Comparative Example 4
Only the base oil (A-4) was subjected to a rust prevention test in the same manner as in Example 1.

  Table 2 shows the compositions of Examples 1 to 7 and Comparative Examples 1 to 4 and the evaluation of the rust prevention test.

Example 8
The grease-like substance obtained in Example 7 was subjected to a rust prevention test in accordance with DIN 51802 (EMCOR test, temperature: room temperature, test time: 165 hours, rotation speed: 80 rpm, test medium: distilled water). After the test time, the rust generation of the bearing was evaluated according to the criteria shown in Table 3 in six stages. The evaluation results are shown in Table 4.

Comparative Example 5
A white grease-like substance was obtained in the same manner as in Example 7 except that the additive (C-2) was excluded and the base oil (A-1) was increased to 140 g. About this grease-like substance, rust generation was evaluated in the same manner as in Example 8. The evaluation results are shown in Table 4.

  INDUSTRIAL APPLICABILITY The present invention can be used in the field of using a lubricant, particularly in the field of using a lubricant composition (particularly as oil, grease, or dispersion) that imparts lubricity and can be used stably for a long time. .

  For example, automotive auxiliary equipment, electrical equipment, construction equipment, information equipment, industrial machinery, machine tools, audiovisual equipment, precision / electrical / electronic equipment for LBP, etc., for office equipment, recording media such as PC, HDD, breakers, electrical contacts , Semiconductor manufacturing equipment, home appliances, clean rooms, dampers, metal processing, transport equipment, automobile industry OEM, railway / ship / aviation, food / pharmaceutical industry, steel, mining / glass / cement industry, chemical / rubber / resin industry, film Examples include the tenter, paper industry, printing industry, wood industry, textile and apparel, mechanical parts that move relative to each other, various machines such as an internal combustion engine and a pump, and parts constituting them. More specifically, rolling bearings, ball bearings, roller bearings, angular bearings, thrust bearings, impregnated bearings, iron bearings, copper bearings, dynamic pressure bearings, resin bearings, bearings such as inner ring rotating bearings, outer ring rotating bearings, Also, linear motion devices such as ball screws, linear motion bearings, reduction gears / speed increase gears, gears, chains, chain bushes, motor power transmission, vacuum pumps, valves, seal pneumatic equipment, etc. Machine tools such as taps / seal, power tools, fixing rollers, spindles, torque limiters, engines, alternators, tension pulleys, idler pulleys, fuel pumps, oil pumps, intake systems / fuels, throttles, electronically controlled throttles (exhaust gas circulation devices Exhaust system parts, cooling system, electric fan motor, fan coupling, water pump, air conditioning system, compressorー, traveling system, hub bearing, braking system, ABS, brake, steering system, power steering, suspension system, drive system, ball joint, transmission, interior / exterior system (power window, headlight, door mirror optical axis adjustment) , Fuel cells, linear guides, electrical contacts, AT switches, combination switches, power window switches, and the like.

Claims (7)

A lubricant composition excellent in rust prevention comprising a fluorine-containing diamide compound represented by the following general formula (I) and a lubricating oil.
Formula (I)

Wherein, Y is an oxygen atom (O), sulfur atom (S), CO group, a SO group, or a SO ₂ group, k is an integer from 1 to 5, m is an integer of 0, n is an integer of 1 or more. The substitution positions of the two substituents in the phenyl group may be any of the ortho, meta, and para positions. ]   The lubricant composition according to claim 1, wherein, in the general formula (I), Y is an oxygen atom (O) or a sulfur atom (S). The lubricating oil, kinematic viscosity (40 ℃) 5~2000mm ² / s according to claim 1 or 2 lubricant composition according comprising a perfluoropolyether oil.   The lubricant composition according to claim 1, 2 or 3, comprising a thickener.   The lubricant composition according to claim 4, wherein the thickener is fine particles having an average primary particle size of 0.01 to 50 μm, and the particles contain at least one selected from fluororesin, silica, graphite, and carbon.   The lubricant composition according to claim 4 or 5, wherein the thickener comprises at least one selected from metal soap, metal composite soap, urea, and aliphatic dicarboxylic acid metal salt.   The lubricant composition according to any one of claims 1 to 6, which is used for a bearing, a gear, a linear guide or a magnetic disk.