CN101128569A

CN101128569A - Lubricant

Info

Publication number: CN101128569A
Application number: CNA2006800057624A
Authority: CN
Inventors: 桥田幸; 泽口涉; 新田敏夫; 桥本达也; 志村明彦; 百合本次郎
Original assignee: Nok Klueber Co Ltd
Current assignee: Nok Klueber Co Ltd
Priority date: 2005-02-22
Filing date: 2006-02-17
Publication date: 2008-02-20
Anticipated expiration: 2026-02-17
Also published as: WO2006090641A1; KR100900748B1; US20080167208A1; JP4697225B2; KR20070054179A; CN101128569B; JPWO2006090641A1; DE112006000066T5

Abstract

A lubricant comprising a lubricating oil or grease which contains as a base oil a perfluoropolyether oil having a dynamic viscosity at 40 DEG C of 50-1,500 mm2/sec and containing no (CF2O)n groups as repeating units for the polymer. The lubricant is usable in applications where it comes into contact with graphite or molybdenum disulfide or applications where it comes into contact with an aluminum material. As the perfluoropolyether base oil is used F(CF2CF2CF2O)mC2F5 or RfO[CF(CF3)CF2O]p(CF2CF2O)qRf'. Even when this lubricant is used in various applications such as those, the high-temperature characteristics (high-temperature durability) are not considerably impaired. When the base oil has a dynamic viscosity of 50-250 mm2/sec, the lubricant is excellent also in low-temperature characteristics.

Description

Lubricant

Technical field

The present invention relates to a kind of lubricant.Relate to a kind of lubricant that contains lubricating oil or lubricating grease in more detail, it is used for contacting with the graphite or the molybdenumdisulphide of the sintered metal bearing that contains graphite or molybdenumdisulphide etc., perhaps is used for contacting with the aluminium of the slide unit that uses aluminium etc.

Background technology

Sintered metal bearing is made of the porous plastid that the multiple pressed powder of compression forms, and wherein pressed powder obtains by add solid lubricants such as graphite, molybdenumdisulphide, carbon black in metal-powders such as iron, copper, tin, zinc.Sintered metal bearing is by the self-lubricating function of the less amount of lubrication oil generation of initial stage dipping, thereby non-refuelling also can be used.Therefore, can keep the lubricant of sufficient quantity for a long time in the bearing, and can stably use, this life-span for bearing is very important.

Bearing as automobile, the service condition of the sintered metal bearing more cheap than ball-and-roller bearing increases day by day, and used lubricant is in special attention high temperature durability and cold property etc. inevitably lubricant is required in the more strict environment in this sintered metal bearing.For this purpose, use is with the lubricating oil composition of perfluoro polyether oil as base oil, but such base oil also has very large surface-area so that can contact coexistence with multiple metal or solid lubricant, so even perfluoro polyether oil can not be kept the stable hot properties that depends on its structure.

Patent documentation 1: Japanese Patent the 2nd, 595, No. 583 communiques

Aluminium is light but specific tenacity is bigger, by it can be obtained higher intensity as alloy or enforcement processing, and have erosion resistance, so can be used for from the slide unit to the trolley part, various uses such as aviation ship components, tame electrical article, power tool class.They to the lightweight of various machineries, improve high-speed rotary part or slide unit working efficiency, saving energy all has contribution.Used lubricant also needs stably to keep excellent performance in the parts of these use aluminiums.

Summary of the invention

The hot properties of discovery perfluoro polyether oils such as the inventor not exclusively depends on its structure, by contact with the graphite or the molybdenumdisulphide that use as a kind of composition in the sintered metal bearing, and rapid reduction hot properties.And, find that perfluoro polyether oil contacts with aluminium, its hot properties also can sharply reduce.

The purpose of this invention is to provide a kind of lubricant that also can significantly not damage hot properties (high temperature durability) in following situation, these situations comprise: be used for contacting with the graphite or the molybdenumdisulphide of the sintered metal bearing that contains graphite or molybdenumdisulphide etc., with situations such as the metal parts of the spot contact bearing that contains graphite or molybdenumdisulphide etc. contacts, perhaps be used for the situation that contacts with aluminium (comprise as slide unit and use aluminium).

Reach purpose of the present invention by the lubricant with following condition, this lubricant uses the repeating unit as polymkeric substance not contain (CF ₂O) _nThe perfluoro polyether oil of base is as base oil, and wherein the dynamic viscosity of perfluoro polyether oil under 40 ℃ is 50～1500mm ²/ second, preferred 50～250mm ²/ second, preferred especially 65～200mm ²/ second, and this lubricant can be used for contacting with graphite or molybdenumdisulphide or being used for contacting with aluminium.Lubricant can be any form of lubricating oil or lubricating grease.Here, as the PFPE base oil, use the perfluoro polyether oil of representing by following general formula.

F(CF ₂CF ₂CF ₂O) _mC ₂F ₅

RfO[CF(CF ₃)CF ₂O] _p(CF ₂CF ₂O) _qRf’

The hot properties of perfluoro polyether oil (high temperature durability) also not exclusively depends on its structure, by contacting with the graphite or the molybdenumdisulphide that use as a kind of composition in the sintered metal bearing, can sharply reduce hot properties, but can provide a kind of according to the present invention and also can significantly not damage the lubricant of hot properties in following situation, these situations comprise: be used for contacting, be used for and contain the situation that the metal parts of the spot contact bearing etc. of graphite or molybdenumdisulphide contacts with the graphite or the molybdenumdisulphide of sintered metal bearing that contains graphite or molybdenumdisulphide etc.In addition, when being used for contacting, comprise the air atmosphere that is used to disperse or has sneaked into graphite or molybdenumdisulphide, for example situation that contacts with graphite or molybdenumdisulphide etc. from motor components such as brush, axles with metal parts.The air atmosphere of dispersing or having sneaked into graphite or molybdenumdisulphide is not limited to these situations.

Dynamic viscosity under 40 ℃ is 50～1500mm ²/ second described perfluoro polyether oil, in the presence of solid lubricants such as graphite, molybdenumdisulphide, even using surpassing under 150 ℃ the high temperature, also can long term maintenance volatility and stability, use parts to obtain the long lifetime thereby make.Particularly dynamic viscosity is 50～250mm ²/ second, preferred 65～200mm ²The perfluoro polyether oil of/second also has excellent cold property.

This lubricant is applicable to and comprises rotation, back and forth, slide, the material of the various slip forms of swing, for example can enumerate: as sintered metal bearing that contains graphite or molybdenumdisulphide or axle bush, as the number control device that dallies, Exhaust gas recirculation device, fuel injection devices such as electronic throttle control device and with hub unit, traction engine, alternators etc. are the thermotolerance that requires of representative, low temperature properties, the purposes of anti-loading is with power transmission, the power-operated window for vehicle engine, wipers etc. are the automobile purposes such as purposes that require wear resistant or low rubbing characteristics of representative; Be used for hard disk drive, diskette storage device, CD drive, magneto optical driver etc. is the information machine purposes of the requirement high speed, low-friction coefficient of representative, low degassing property etc.; Being used for LBP scanning device engine etc. is the business machine purposes of representative; The engine purposes etc. that is used for other the tame electrical article that can under hot environment, use, sound equipment articles for use etc.Also can be applicable to effectively other contact or sneaked into the purposes of using under the environment of graphite or molybdenumdisulphide.

The hot properties of perfluoro polyether oil (high temperature durability) in that when contact, this characteristic sharply reduces with aluminium (comprise as slide unit use aluminium), can significantly not damage hot properties when still lubricant of the present invention is used for this situation.That is, under the coexistence of aluminium, even use lubricant of the present invention surpassing under the hot conditions of 150 ℃ or 200 ℃, also can long term maintenance volatility and stability, by in various slips, bringing into play oilness, thereby use parts to obtain extra long life.

Except that these purposes, this lubricating oil also can be used for the bearing or the axle bush of chain used in warming mill, building machinery, work mechanism, power tool, printing bookbinding sheet processing machinery or their parts of plastic working device, business machine, duplicating machine etc.; Can also be further used for the lubricated of contact position between the sliding position individuality of ball-and-roller bearing, sliding surface bearing, sintered bearing, gear, valve, stop valve, oil sealing, beaming roller, electrical pickoff etc.

Description of drawings

Fig. 1 is in the presence of graphite or molybdenumdisulphide, 200 ℃ down various PFPE base oils the weight decrement through the time change synoptic diagram.

Embodiment

Dynamic viscosity (JIS K2283 benchmark under using 40 ℃ as base oil; Corresponding to ASTMD445) be 50～1500mm ²/ second, preferred 50～250mm ²/ second, preferred especially 65～200mm ²/ second, and do not contain (CF as the repeating unit of polymkeric substance ₂O) _nThe base oil of base.As described later shown in embodiment 1 and Fig. 1 chart, be determined at perfluoro polyether oil when leaving standstill in 200 ℃ the thermostatic bath through the time change (the weight decrement of oil), contain (CF as the repeating unit of polymkeric substance ₂O) _nThe perfluoro polyether oil of base through the time change with other perfluoro polyether oil under the situation that does not have graphite or molybdenumdisulphide and compare, its weight decrement through the time to change not be remarkable especially, if but with graphite or molybdenumdisulphide coexistence then should through the time change remarkable especially; Do not contain (CF as repeating unit on the other hand ₂O) _nThe perfluoro polyether oil of base, even under the coexistence of graphite or molybdenumdisulphide, this feature only has subtle change, does not contain (CF so can use as repeating unit ₂O) _nThe perfluoro polyether oil of base is as base oil.

As described later shown in the result of embodiment 2, even under the coexistence of aluminium, lubricant of the present invention is under 250 ℃ high temperature, and its weight decrement and also is same result-40 ℃ dynamic viscosity also in the scope of allowing.

Repeating unit as polymkeric substance does not contain (CF ₂O) _nThe perfluoro polyether oil (base oil) of base for example can be listed below the perfluoro polyether oil of formula.

(A)F(CF ₂CF ₂CF ₂O) _mC ₂F ₅

(B)RfO[CF(CF ₃)CF ₂O] _p(CF ₂CF ₂O) _qRf’

Perfluoro polyether oil (A): by in the presence of the cesium fluoride catalyzer 2,2,3,3-tetrafluoro trimethylene oxide carries out anionoid polymerization, again with gained fluorochemical polyether (CH ₂CF ₂CF ₂O) _nUnder 160～300 ℃ uviolizing, handle and to obtain perfluoro polyether oil (A) with fluorine gas.Its dynamic viscosity that can use under 40 ℃ is 5～2000mm ²/ second perfluoro polyether oil, this perfluoro polyether oil satisfies the condition of m=2～100 in the general formula of perfluoro polyether oil (A).

Perfluoro polyether oil (B): by fluoridizing fully with the precursor that tetrafluoroethylene carries out photoxidation polymerization generation by R 1216 or its, perhaps carry out anionoid polymerization with the tetrafluoroethylene oxide compound, again gained is had terminal CF (CF by hexafluoropropene oxide in the presence of the cesium fluoride catalyzer or its ₃) acyl fluorides of COF base handles with fluorine gas and can obtain perfluoro polyether oil (B).Its dynamic viscosity that can use under 40 ℃ is 5～2000mm ²/ second perfluoro polyether oil, this perfluoro polyether oil satisfies the condition of p+q=2～200 in the general formula of perfluoro polyether oil (B), q/p=0～2: 1.

Dynamic viscosity is 50mm ²/ second following perfluoro polyether oil, it is big that vaporization losses rate (weight decrement) becomes, and the oil film strength reduction etc., thereby causing lifetime or cause abrasion, Cylinder sticking, dynamic viscosity is 1500mm on the other hand ²/ second above perfluoro polyether oil, it is very high that pour point becomes, and not only can not obtain sufficient cold property, and because the increase of viscous resistance causes the problem that consumer motivation or torque increase, so if be 50～1500mm as the dynamic viscosity under 40 ℃ of the base oils ²/ second then can bring into play sufficient heat-resistant stability, particularly under cold condition for example-40 ℃, when requiring to have good cold property, only limiting to use dynamic viscosity is 50～250mm ²/ second, preferred 65～200mm ²The perfluoro polyether oil of/second.Perfluoro polyether oil with such dynamic viscosity not only satisfies sufficient anti-vaporization losses characteristic or cold property, and also can stably use above under 200 ℃ the hot conditions.But the also perfluoro polyether oil that can be mixed with two or more, at this moment mixing base oil must be in above-mentioned scope in the dynamic viscosity under 40 ℃.

Can add the use thickening material in such base oil, preferably use fluoro-resin.As fluoro-resin, can use over as the tetrafluoroethylene of lubricant, tetrafluoraoethylene-hexafluoropropylene copolymer, perfluorinated alkylidene resin etc.It is about tetrafluoroethylene of about 1000～1000000 that methods such as the emulsion polymerization by tetrafluoroethylene, suspension polymerization, solution polymerization are made number-average molecular weight Mn, then it is handled by methods such as thermolysis, electron rays irradiation decompositions, physical pulverization, use number-average molecular weight Mn is about about 1000～500000.In addition, the copolymerization of tetrafluoroethylene and R 1216 and lower molecular weight processing also with the same the carrying out of situation of tetrafluoroethylene, use number-average molecular weight Mn to be about about 1000～600000.Can when copolyreaction, use chain-transfer agent to carry out the control of molecular weight.The Powdered fluoro-resin of gained generally has below about 500 μ m, the average primary particle diameter of preferred about 0.1～30 μ m.Add pulverous fluoro-resin and can give oil film formability, the anti-leaks of dispersing, rust-preventing characteristic, and can further improve oilness and weather resistance.

As the thickening material except that fluoro-resin, can use mineral substance such as metallic soap, urea-formaldehyde resin, wilkinite, pigment dyestuff, polyethylene, polypropylene, polymeric amide etc. such as Li soap, if consider from thermotolerance, oilness aspect, preferably use aliphatic dicarboxylic acid metal-salt, monoamide monocarboxylic acid metal-salt, monoesters carboxylic metallic salt, allophanamide, triuret, four ureas etc.

The interpolation blending ratios of thickening material in the perfluoro polyether oil base oil such as these fluororesin powders are 0.1～40 weight % of total composition, preferred 0.5～30 weight %.If adding proportion is more than it, then composition is really up to the mark, cause can not bearing enclosed grade in, on the other hand, if adding proportion below it, then can not be brought into play the thickening capabilities of fluoro-resin, apparent viscosity reduces, dispersiveness in base oil worsens, thereby can't improve oil film formability, anti-leaks and the rust-preventing characteristic of dispersing.The adding proportion of thickening material be thickening material and base oil total amount a little less than then forming lubricating grease about 10 weight %, in aftermentioned embodiment and comparative example, the ratio of thickening material is that 5 weight % are when following, belong to the category of " liquid lubricating grease " and demonstrate flowability, so the evaluation of cold property is represented with the low temperature viscosity of base oil mixture.On the other hand, the ratio of thickening material is in the example of 30 weight %, owing to the category that belongs to lubricating grease becomes semi-solid, so the evaluation of cold property is represented with the evaluation result of low temperature torque.

Further, in the scope of not damaging purpose of the present invention, can add as required and use the plain class additive of previously known fluorine, for example the end of perfluoro polyether oil is by the compound of replacements such as the resultant of reaction of ethanol, carboxylic acid or its ester, amine, acid amides, phosphoric acid or its ester, phosphonic acids or its ester, isocyanic ester and ethanol or amine.

Owing to added fluoro-resin, before can also further adding in the lubricant base oil as required and the additive that adds in the lubricant before the immiscible various non-fluorine element class additive of perfluoro polyether oil, viscosity index improver, pour point depressant, ashless dispersant, metal species sanitising agent, antioxidant, rust-preventive agent, sanitas, defoamer, extreme-pressure additive, oiliness improver, friction modifier, solid lubricant etc.

As antioxidant, for example can enumerate: 2,6 di tert butyl 4 methyl phenol, 4,4 '-methylene-bis phenol antioxidants such as (2,6 di t butyl phenols); Has carbonatoms and is the amine antioxidants such as alkyl diphenylamine, triphenylamine, phenyl-a-naphthylamine, thiodiphenylamine, alkylation-alpha-naphthylamine, Off エニチアジ Application, alkylation Off エニチアジ Application of 4～20 alkyl.

As rust-preventive agent, for example can enumerate: lipid acid, fatty acid amine, alkylsulphonic acid metal-salt, alkylsulphonic acid amine salt, oxidized petroleum wax, Voranol EP 2001 etc., as sanitas, for example can enumerate: benzotriazole, benzoglyoxaline, thiadiazoles etc.

As extreme-pressure additive, for example can enumerate: Phosphorus compounds such as phosphoric acid ester, phosphorous acid ester, phosphate amine salt; Sulphur such as sulfide, disulphide compounds; Dialkyl dithiophosphoric acid metal-salt, dialkyldithiocarbamacompositions metal-salt etc.

As oiliness improver, for example can enumerate: lipid acid or its ester, higher alcohols, polyvalent alcohol or their ester, fatty amine, glycerine monofatty ester etc.

As solid lubricant, for example can enumerate: graphite, molybdenumdisulphide, boron nitride, silicon nitride etc., when using graphite or molybdenumdisulphide as solid lubricant, can also prevent the PFPE base oil effectively heat-resisting through the time reduction that changes.

In the PFPE base oil, add the composition that thickening material forms, for example can be prepared according to method described as follows.

(a) add the thickening material of specified quantitative in the PFPE base oil respectively, the method of fully mediating with triple-roller mill or high pressure homogenizer, (b) toward adding perfluoro polyether oil and aliphatic carboxylic acid and heating and melting in the reactor of heated and stirred, carry out metal salinization reaction (and amidate action or esterification) and cooling toward the metal hydroxides (and amide compound or alkylol cpd) that wherein adds specified quantitative then, the method of fully mediating again with triple-roller mill or high pressure homogenizer, perhaps

(c) toward adding perfluoro polyether oil and isocyanic ester and heating in the reactor of heated and stirred, the past then amine that wherein adds specified quantitative reacts and cools off, again the method for fully mediating with triple-roller mill or high pressure homogenizer.

Embodiment

Be described more specifically the present invention by the following examples, but the present invention is not subjected to the restriction of these embodiment.

Embodiment 1

Admixed graphite powder (black japan leadwork flakey blacklead powder CB-150 in following 3 kinds of PFPE base oils; Fixed carbon content is more than 98.0%, median size 40 μ m) or molybdenumdisulphide (the lubricated goods LM13-SM powder in big east; Median size 0.4 μ m), in sample, be the amount of 10 weight %, get this test and on the glass dish of diameter 36mm, be coated with into film like equably with sample 0.6g, rest on then in 200 ℃ the thermostatic bath, measure oil the weight decrement through the time change.

The gained result as shown in Figure 1.

●: F (CF ₂CF ₂CF ₂O) _mC ₂F ₅(40 ℃ of following dynamic viscosity: 100mm ²/ second)

Zero :+graphite

▲: RfO[CF (CF ₃) CF ₂O] _p(CF ₂CF ₂O) _qRf ' (40 ℃ of following dynamic viscosity: 180mm ²/ second)

△ :+graphite

■: RfO (CF ₂CF ₂O) _m(CF ₂O) _nRf ' (40 ℃ of following dynamic viscosity: 160mm ²/ second)

:+graphite

◆ :+molybdenumdisulphide

From the gained result as can be known, the repeating unit as polymkeric substance does not contain (CH ₂O) _nThe perfluoro polyether oil of base, 200 ℃ down the weight decrements of oil be subjected to the influences of graphite hardly, relative therewith, contain (CH as the repeating unit of polymkeric substance ₂O) _nThe perfluoro polyether oil of base, because the existence of graphite or molybdenumdisulphide, particularly graphite, nearly all oil vaporization losses all in the extremely short time.

Embodiment 2

Toward the following PFPE base oil (A) with the dynamic viscosity under various 40 ℃ or (B), the aluminum mixture powder is (with the pure medicine goods of light; Purity 99.5%, median size 53～150 μ m), it in sample the amount of 10 weight %, get this test and on the glass dish of diameter 37mm, be coated with into film like equably with sample 0.3ml, rest on then in 250 ℃ the thermostatic bath, mensuration is calculated the weight decrement of oil through the weight of the glass dish integral body after 100 hours.

Perfluoro polyether oil (A): F (CF ₂CF ₂CF ₂O) _mC ₂F ₅

40 ℃ dynamic viscosity (A-1) 65mm ²/ second

(A-2) 100mm ²/ second

(A-3) 200mm ²/ second

(A-4) 23mm ²/ second

Perfluoro polyether oil (B): RfO[CF (CF ₃) CF ₂O] _pRf '

40 ℃ dynamic viscosity (B-1) 180mm ²/ second

(B-2) 400mm ²/ second

(B-3) 25mm ²/ second

(B-4) 1200mm ²/ second

Perfluoro polyether oil (C): RfO (CF ₂CF ₂O) _m(CF ₂O) _nRf '

40 ℃ dynamic viscosity 140mm ²/ second

In addition, use the polytetrafluorethylepowder powder that emulsion polymerization method obtains (Mn about 50000～100000, average primary particle diameter 0.2 μ m) as fluororesin powder.

The amount (weight part) of the kind of base oil and amount (weight part), fluoro-resin and additive, and the result of gained: base oil or base oil-fluoro-resin mixture at 40 ℃ dynamic viscosity and pour point (based on JIS K2269; Corresponding to ASTM D97), the oil weight decrement of (base oil) and low temperature viscosity (based on JIS K2283 ,-40 ℃ dynamic viscosity; Corresponding to ASTM D445), as shown in table 1 below in the lump.No.1～12 are embodiment, and No.13～15 are comparative example.

Table 1

Lubricating oil (composition)				The mensuration project
Lubricating oil (composition)				The mensuration project				Base oil			Fluorine	40 ℃ dynamically glue	Weight subtracts	Pour point	Low temperature viscosity
No.	Kind	Amount	Amount of resin	Degree (mm ²/ second)	Few rate (%)	(℃)	(mm ²/ second)	Base oil			Fluorine	40 ℃ dynamically glue	Weight subtracts	Pour point	Low temperature viscosity
No.	Kind	Amount	Amount of resin	Degree (mm ²/ second)	Few rate (%)	(℃)	(mm ²/ second)	1 2 3 4 5 6 7 8 9 10 11 12 13 14 15	A-1 A-2 A-3 A-1 A-2 A-1 A-3 A-2 A-3 A-1 B-2 A-2 B-1 A-2 B-2 A-3 B-1 B-2 B-4 A-4 B-3 C	100 100 100 25 75 40 60 30 70 70 30 40 60 80 20 50 50 100 100 100 100 100	- 1 - 1 3 - - - 5 3 - - - 3 -	65 100 200 90 130 162 105 140 130 190 400 1200 23 25 140	41.3 27.7 2.5 31.3 16.9 10.7 27.2 31.2 23.2 29.8 34.2 1.0 94.4 98.3 93.0	＜-60 ＜-60 ＜-60 ＜-60 ＜-60 ＜-60 ＜-60 -50.0 -55.0 -50.0 -30 -15 ＜-60 -60.0 -60.0	8,800 15,500 37,000 14,000 25,000 30,000 36,000 75,000 45,000 80,000 can not measure＞100,000 30,000 11,000 4,000

From above result as can be known, use 40 ℃ the not enough 50mm of dynamic viscosity ²/ second perfluoro polyether oil the time (No.13,14), the weight decrement under 250 ℃ enlarges markedly.In addition, use repeating unit to contain (CF as polymkeric substance ₂O) _nDuring the perfluoro polyether oil of base (No.15), 250 ℃ of weight decrements after following 100 hours increase, and most of sample disappears.Relative therewith, the dynamic viscosity of using 40 ℃ is at 50～1500mm ²/ second scope in perfluoro polyether oil the time, under 250 ℃ high temperature the weight decrement still in allowed limits, and 40 ℃ dynamic viscosity is at 50～250mm ²/ second scope in perfluoro polyether oil, in-40 ℃ dynamic viscosities still in above-mentioned scope (No.1～10).

Moreover, for the lubricating grease that contains A-170 weight part-fluoro-resin 30 weight parts (No.21), A-270 weight part-fluoro-resin 30 weight parts (No.22), B-270 weight part-fluoro-resin 30 weight parts (No.23) and B-370 weight part-fluoro-resin 30 weight parts (No.24), except that the above low temperature torque test of also carrying out every (based on JIS K2220.5.14, is measured-40 ℃ when starting down and solid periodic value; Corresponding to ASTM D1478).The gained result is as shown in table 2 below.No.24 is a comparative example.

Table 2

The mensuration project	No.21	No.22	No.23	No.24
The mensuration project	No.21	No.22	No.23	No.24	40 ℃ dynamic viscosity (mm ²/ second) weight decrement (%) pour point (℃) low temperature viscosity (mm ²/ second) when the low temperature torque starts (Ncm) fixedly the time (Ncm)	65 29.1 ＜-60 8800 7.8 3.8	100 20.3 ＜-60 15500 8.7 4.5	400 15.8 -30 × × ×	25 69.4 -60.0 11,000 8.0 4.1

Annotate) *: can not measure

Claims

1. lubricant, it is used for contacting with graphite or molybdenumdisulphide or contacting with aluminium, and its dynamic viscosity with 40 ℃ is 50～1500mm ²/ second, and do not contain (CF as the repeating unit of polymkeric substance ₂O) _nThe perfluoro polyether oil of base is as base oil.

2. the described lubricant of claim 1, the dynamic viscosity of wherein using 40 ℃ is 50～250mm ²The perfluoro polyether oil of/second is as base oil.

3. the described lubricant of claim 1, wherein the PFPE base oil is with general formula

F(CF ₂CF ₂CF ₂O) _mC ₂F ₅

(wherein, n is 2～100 integer) expression perfluoro polyether oil (A) and with general formula

RfO[CF(CF ₃)CF ₂O] _p(CF ₂CF ₂O) _qRf’

(wherein, Rf and Rf ' they are that identical or mutually different carbonatoms is 1～5 perfluoroalkyl, p+q=2～200, and q/p=0～2 and q can be 0, CF (CF ₃) CF ₂O base and CF ₂CF ₂The O base is randomly-bonded in main chain) expression perfluoro polyether oil (B) at least a.

4. the described lubricant of claim 2, wherein the PFPE base oil is with general formula

F(CF ₂CF ₂CF ₂O) _mC ₂F ₅

RfO[CF(CF ₃)CF ₂O] _p(CF ₂CF ₂O) _qRf’

5. the described lubricant of claim 1, it is a lubricating oil.

6. the described lubricant of claim 2, it is a lubricating oil.

7. the described lubricant of claim 1 wherein further mixes thickening material, uses as lubricating grease.

8. the described lubricant of claim 7, wherein thickening material is a fluororesin powder.

9. the described lubricant of claim 2 wherein further mixes thickening material, uses as lubricating grease.

10. the described lubricant of claim 9, wherein thickening material is a fluororesin powder.

11. the described lubricant of claim 1, its with graphite or molybdenumdisulphide as the sintered metal bearing of sintering composition in impregnation use.

12. the described lubricant of claim 2, its with graphite or molybdenumdisulphide as the sintered metal bearing of sintering composition in impregnation use.

13. the described lubricant of claim 1, it contacts with the metal parts that contains graphite or molybdenumdisulphide and uses.

14. the described lubricant of claim 2, it contacts with the metal parts that contains graphite or molybdenumdisulphide and uses.

15. the described lubricant of claim 1, it is used for having dispersed, having sneaked into the air ambient of graphite or molybdenumdisulphide.

16. the described lubricant of claim 2, it is used for having dispersed, having sneaked into the air ambient of graphite or molybdenumdisulphide.

17. the described lubricant of claim 1, it is used to use aluminium as slide unit.

18. the described lubricant of claim 2, it is used to use aluminium as slide unit.