KR101442256B1 - Lubricant composition and lubricating system using same - Google Patents

Abstract

The present invention provides a semi-solid lubricant composition at room temperature that exhibits a high dynamic friction coefficient that is advantageous for power transmission and has a high lubricity even in a thin film state by applying a very small amount of an emulsion to a lubricating sliding portion, Thereby providing a lubricating system.

The present invention relates to a curable composition comprising 10 to 98.9% by mass of a liquid base oil which is at least one selected from the group consisting of hydrocarbon base oils, phosphoric acid esters and silicon having a% Cp of 70 or less, 1 to 20% by mass of an alkaline earth metal salt, And a lubrication system using such a lubricant composition in an electromotive element mechanism.

A lubricating composition, a lubricating system, a hydrocarbon base oil, a liquid base oil,

Description

TECHNICAL FIELD [0001] The present invention relates to a lubricant composition and a lubrication system using the lubricant composition.

TECHNICAL FIELD The present invention relates to a lubricant composition which is a semi-solid phase at room temperature, and more particularly to a lubricant composition having excellent wear resistance and extreme pressure and high coefficient of dynamic friction. The present invention also relates to a lubrication system using the lubricant composition in a motorized element mechanism.

In recent years, multifunctionality, high performance, environmental response, energy saving, and longevity have become key technologies in various industrial technologies. As environmental issues, there are many such as carbon dioxide emission reduction, power saving, energy saving, effective utilization of resources. As a result, eco-friendly research has been carried out in various mechanical systems such as small precision machines, industrial machines, transportation systems, etc., and furthermore, characteristics such as longevity, reliability, and high performance have been given.

As an example of longevity improvement, it is demanded to keep the lubrication performance of the sliding part of the machine uncomfortably up to the life of the product. In recent years, the lubrication condition of a mechanical system has become even more stringent, and a higher performance lubricity is required for a lubricant. Lubricants include liquid lubricants and semi-solid lubricants, which are appropriately used according to the application.

The spread of information devices is expanding. Mobile phones and notebook computers are also being produced in various designs. In such a product, the display surface and the operating portion are made to be openable and closable, and the opening and closing thereof is performed by a hinge component called a hinge, and since the opening and closing move smoothly at the time of opening and closing, It is necessary that the difference in friction coefficient be as small as possible. Moreover, since the desired opening / closing angle is required to be maintained for a long time during use of the device, the static friction coefficient needs to be as high as possible. Since such a hinge is often used in an environment directly touching a consumer, it is necessary to thoroughly avoid contamination due to oil leakage, and it has been difficult to apply a liquid lubricating oil. On the other hand, although grease can be suppressed at room temperature, grease can leak when the oil and the thickener are separated due to the temperature rise of the sliding portion, and the initial lubrication performance can not be maintained. Examples of electric element mechanisms that require high power transmission capability of the emulsion other than the hinge include gears, belts, chains, wire ropes, and mechanical type continuously variable transmissions. Such element mechanisms are widely used in various industrial machines such as household electric appliances, OA machines, precision machines, machine tools, automobiles, motorcycles, bicycles, and railroad transportation systems. Particularly, a mechanical continuously variable transmission is required to have a high dynamic friction coefficient and a traction coefficient.

These electromotive element mechanisms must have sufficient lubricity and high dynamic friction coefficient and traction coefficient. Conventional naphtha base oils and silicone base oils have been applied in order to realize a high dynamic friction coefficient. Antioxidants, abrasion inhibitors, and the like have been mixed with these base oils and have been used as so-called traction oils. However, the traction oil is a liquid, but it becomes a problem in the longevity improvement of a mechanical system such as oxidation deterioration because oxygen is dissolved in the oil, evaporation by the temperature rise, leakage from the seal part. On the other hand, grease does not require the system to be a sealed structure as compared with the case where lubricating oil is used, but the oil and the thickener are separated at the high temperature and the oil and the thickener separated once are not recovered. Or the separated oil may contaminate the surroundings.

Particularly, in recent years, there is a strong demand for high performance, miniaturization and long service life of mechanical systems, and it is demanded that the lubricant is further improved in performance, and particularly lubricating even at a very small flow rate.

To solve these problems, the present inventors have proposed a composition having a lubricating property on a thermoreversible gel, a lubricant for a bearing, and a bearing system using the lubricant, as well as a notebook type personal computer, a hinge of a mobile phone, and a mechanical type continuously variable transmission There is still a need for a movement for aspiring a lubricant exhibiting a high dynamic friction coefficient and excellent abrasion resistance.

[Patent Document 1] Patent No. 3775986

[Patent Document 2] International Patent Publication No. WO2006-051671

[Non-Patent Document 1] Japan Society of Tribology, Tribology Handbook, Publication of Yang Hyun, (2001) P247.

The present invention solves the above-mentioned problems, and it is an object of the present invention to provide a lubricant sliding member which is coated with a very small amount of an emulsion, and which has high lubricity even in a thin film state, It is another object of the present invention to provide a lubricating system using this lubricant composition for an electromotive element mechanism.

In order to solve the above problems, the inventors of the present invention have made intensive studies on a lubricant base oil, a chemical substance having lubricity, additives, and the like, and their combination, and as a result, they have reached the present invention.

That is, the present invention is the following lubricant composition and lubrication system.

(1) 10 to 98.9 mass% of at least one liquid base oil selected from hydrocarbon base oils, phosphoric acid esters, and silicon having a% Cp of 70 or less, 1 to 20 mass% alkaline earth metal salts, and 0.1 to 89 mass% ≪ / RTI > and is semi-solid at room temperature.

(2) The lubricant composition according to (1), wherein the alkaline earth metal salt is at least one selected from a sulfonate salt, a pinaceate salt and a salicylate salt having a total base of 5 to 400 mgKOH / g.

(3) The lubricant composition according to the above-mentioned (1) or (2), wherein the amide compound is at least one compound represented by the following formulas (1) to (3).

R ¹ -CO-NH-R ²

R ³ -CO-NH-A ¹ -NH-CO-R ⁴

R ⁵ -NH-CO-A ² -CO-NH-R ⁶

Each of R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ independently represents a saturated or unsaturated straight chain hydrocarbon group having 5 to 25 carbon atoms, R ² may be hydrogen , A ¹ and A ² are each a divalent hydrocarbon group of 1 to 10 carbon atoms selected from an alkylene group having 1 to 10 carbon atoms, a phenylene group, or an alkylphenylene group having 7 to 10 carbon atoms.

(4) an amide compound represented by the formula 1 to 3, R ^1, R ^2, R ^3, R ^4, R ⁵ and R ⁶ are independently of a saturated chain hydrocarbon group of a carbon number of 12 to 20 or, respectively, or R ² And / or R ¹ and R ² , R ³ and R ⁴ , and R ⁵ and R ⁶ Is an amide compound having an unsaturated chain hydrocarbon group having 12 to 20 carbon atoms.

(5) A lubricating system using the lubricant composition according to any one of (1) to (4) in a motorized element mechanism.

(6) The electric element mechanism is, in particular, a hinge requiring maintenance at a predetermined angle, and a mechanical type continuously variable transmission for transmitting power by an oil agent having a high traction coefficient.

According to the lubricant composition of the present invention, a small amount of lubricant is applied to the lubricating sliding portion to form a stable thin film at the time of sliding, thereby exhibiting a remarkable effect of exhibiting high extreme pressure and high dynamic friction coefficient. Further, since the lubricant composition of the present invention has a thermoreversibility and exhibits a semi-solid phase at room temperature and exhibits a uniform liquid state at a temperature higher than the melting point of the amide compound, the liquid- The semi-solid can be maintained in a place where the temperature does not rise above the melting point. Therefore, it can be effectively used as a lubricant for electric element mechanisms such as gears, belts, chains, wire ropes, hinges, and mechanical type continuously variable transmissions without oxidation deterioration, evaporation loss and oil leakage.

The present invention is a lubricant composition comprising 10 to 98.9 mass% of a liquid base oil, 1 to 20 mass% of a metal salt, and 0.1 to 89 mass% of an amide compound and being semi-solid at room temperature, When it is applied to an electromotive element mechanism, it becomes a liquid phase when a state requiring lubrication is performed, and a high dynamic friction coefficient is exhibited. In particular, it is useful for services requiring extreme pressure lubrication, such as low-speed and high-load service, in which burning trouble is a concern, and exhibits high lubricity under a thin film and excellent oil retention properties, so oil breakage is unlikely to occur, Loses. In addition, when the sliding portion of the electroluminescent element mechanism starts to move, the temperature of the sliding portion rises, the lubricant composition of the present invention moves from the semi-solid phase to the liquid state and enters the narrow sliding portion to function as the lubricant composition. Since the portion where the frictional heat does not propagate is maintained in a semi-solid state, there is no need to worry about so-called oil leakage, and the surroundings can be kept clean at all times.

Here, the term " normal temperature " means the ordinary temperature of the room, and specifically refers to a temperature environment of about -20 to 50 캜, more typically about -10 to 30 캜.

The lubricant composition preferably exhibits a high dynamic friction coefficient and exhibits, for example, 0.1 to 0.3, particularly 0.14 to 0.20, and more preferably 0.15 to 0.18.

[Liquid base oil]

The liquid base oil used in the present invention is at least one selected from the group consisting of a hydrocarbon base oil having a% Cp of 70 or less, a phosphoric acid ester, and silicon. The hydrocarbon base oil, phosphoric acid ester, and silicone may be used alone or as a mixture of two or more.

As the hydrocarbon base oil having a% Cp of 70 or less, alkyl naphthene and alkylbenzene are preferably used, and a mineral oil base oil may also be used. It is necessary that the hydrocarbon base oil is composed of a hydrocarbon compound and contains a large amount of naphthenes and hydrocarbons of aromatic rings, that is, the sum of% Cn and% Ca exceeds 30. The viscosity index of the hydrocarbon base oil is preferably 80 or less, particularly preferably 20 or less, and usually -400 or more. The physical properties of the liquid base oil are not particularly limited, but preferably the kinematic viscosity at 40 占 폚 is 5 to 5000 mm2 / s, more preferably 50 to 3000 mm2 / s, further preferably 500 to 2000 mm2 / s . % Ca,% Cp, and% Cn are those determined by n-d-M ring analysis specified in ASTM D3238.

Examples of the alkyl naphthene include synthetic naphthene and naphthenic mineral oil. Examples of alkylbenzenes include hard alkylbenzenes and soft alkylbenzenes. Examples of phosphoric acid esters include orthophosphoric acid esters and phosphorous acid esters, and in general, tricresyl phosphate and the like can be mentioned. Examples of silicone oil include polydimethylsiloxane, polymethylphenylsiloxane and the like.

Among them, a hydrocarbon base oil having% Ca of 10 or less, specifically, alkylnaphthene is excellent in terms of high dynamic friction characteristics and lubricity and can be preferably used. These base oils may be used alone or in combination of two or more as long as they satisfy the above physical properties.

The liquid base oil is blended in an amount of 10 to 98.9 mass%, preferably 30 to 97 mass%, and more preferably 70 to 93 mass% in the lubricant composition which is a semi-solid phase at room temperature finally obtained. When the blending amount of the liquid base oil is less than this range, high dynamic friction characteristics as a base oil can not be obtained, which is not preferable.

[Alkaline earth metal salt]

In the present invention, an alkaline earth metal salt such as Ca, Ba, Mg or the like, preferably an organic acid salt of an alkaline earth metal is used to increase the coefficient of dynamic friction. As the organic acid, carboxylic acid, sulfonic acid, phenol, phosphonic acid, salicylic acid and the like can be used. Among them, at least one alkaline earth metal salt selected from a sulfonate salt, a pinaceate salt and a salicylate salt is preferable, and a sulfonate, a pinate, a salicylate and the like of an alkaline earth metal of Ca The sulfonate can be preferably used. These are commercially available as metal-based clean dispersants. These alkaline earth metal salts may contain an overbased component composed of a carbonate. Concretely, an alkaline earth metal salt having a total base of 5 to 400 mg KOH / g, particularly 50 to 400 mg KOH / g is more preferable Can be used.

The alkaline earth metal salt is compounded in an amount of 1 to 20 mass%, preferably 2 to 20 mass%, more preferably 2 to 10 mass%, in the lubricant composition which is a semi-solid phase at room temperature at the finish. When the amount of the metal salt is less than this range, an effective contribution to the friction characteristics can not be obtained. On the other hand, if the amount exceeds the above range, the effect of contributing to the friction characteristics becomes high and the cost becomes high.

[Amide compound]

The amide compound used in the present invention is a fatty acid amide compound having at least one amide group (-NH-CO-), which is a monoamide having one amide group represented by the following general formula (1), and an amide group represented by general formulas Two kinds of bisamides can be preferably used. It is preferable to use a combination of a monoamide and a bisamide.

≪ Formula 1 >
R ¹ -CO-NH-R ²

In the formulas, R ¹ and R ² are each independently a saturated or unsaturated chain hydrocarbon group having 5 to 25 carbon atoms, and R ² may be hydrogen.

(2)
R ³ -CO-NH-A ¹ -NH-CO-R ⁴

(3)
R ⁵ -NH-CO-A ² -CO-NH-R ⁶

In formulas (2) and (3), R ³ , R ⁴ , R ⁵ and R ⁶ are each independently a saturated or unsaturated chain hydrocarbon group having 5 to 25 carbon atoms, and A ¹ and A ² are alkylene groups , A phenylene group or an alkylphenylene group having 7 to 10 carbon atoms. The alkylphenylene group may be a divalent hydrocarbon group in which two or more of a phenylene group and an alkyl group and / or an alkylene group is bonded.

The monoamide compound is represented by the above formula (1), wherein a part of hydrogen constituting R ¹ and R ² may be substituted with a hydroxyl group. Specific examples of such a monoamide compound include saturated fatty acid amides such as lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide and hydroxystearic acid amide, unsaturated fatty acid amides such as oleic acid amide and erucic acid amide, And saturated or unsaturated long chain fatty acids such as stearyl stearic acid amide, oleyl oleic acid amide, oleyl stearic acid amide and stearyl oleic acid amide, and substituted amides by long chain amines.

Among these monoamide compounds, R ¹ and R ² in the formula (1) are each independently an amide compound of a saturated chain hydrocarbon group having 12 to 20 carbon atoms and / or at least one of R ¹ and R ² is an unsaturated It is preferably an amide compound of a hydrocarbon group, more preferably a mixture of amide compounds. And a monoamide compound wherein the unsaturated chain hydrocarbon group is an oleyl group having an unsaturated bond of carbon number 18 is preferable. More specifically, oleic acid amide and oleyl oleic acid amide are preferable, and a thin film is formed and held on the sliding portion, thereby securing thin film retention that is effective in eliminating the trouble of sintering.

The bisamide compound is a compound represented by the above general formula (2) or (3) in the form of an acid amide of a diamine or an acid amide of a diacid. In the hydrocarbon groups represented by R ³ , R ⁴ , R ⁵ and R ⁶ , and A ¹ and A ² in the general formulas (2) and (3), some hydrogen may be substituted with a hydroxyl group (-OH).

Specific examples of the amide compound represented by the formula (2) include ethylenebisstearic acid amide, ethylenebisisostearic acid amide, ethylenebisoleic acid amide, methylenebislauric acid amide, hexamethylenebisoleic acid amide, hexamethylenebis hydroxystearic acid Amide, and m-xylenebisstearic acid amide. Specific examples of the amide compound represented by the formula (3) include N, N'-distearyl sebacate amide and the like.

Among these bisamide compounds, as in the case of the monoamide compound, R ³ and R ^{4 in the general} formula (2) and R ⁵ and R ^{6 in the general} formula (3) are each independently an amide compound of a saturated chain hydrocarbon group having 12 to 20 carbon atoms and / At least one of R ³ and R ⁴ and R ⁵ and R ⁶ is preferably an amide compound of an unsaturated chain hydrocarbon group having 12 to 20 carbon atoms and more preferably a mixture of both amide compounds. And a bisamide compound in which the unsaturated chain hydrocarbon group is an oleyl group having an unsaturated bond having a carbon number of 18 is preferable in securing the thin film retention property. As such a compound, there may be mentioned ethylenebisoleic acid amide, hexamethylenebisoleic acid amide and the like.

When the amide compound is uniformly mixed with the liquid base oil, a composition having a gel phase lubricity at room temperature is formed. Accordingly, the amide compound functions as a semi-solid state compound for semi-solidifying (gelling) the liquid base oil, and in the situation where the lubricating property inherent in the lubricant composition is exhibited, the amide compound is melted by frictional heat and functions as a liquid lubricant composition. Considering that it is used in a semi-solid state at a room temperature and at a high temperature, the amide compound preferably used has a melting point of preferably 50 to 200 ° C, more preferably 80 to 180 ° C, and a molecular weight of 100 to 1000 , And more preferably from 150 to 800.

Further, in order to prevent the occurrence of burning even under difficult lubrication conditions in a sliding portion which can be used only in a very small amount of emulsion due to a design restriction of a mechanical system, an oil film must strongly adhere to and adhere to the sliding surface. For this purpose, an emulsion having an adhesive property is required, but in the present invention, it has been found that when the hydrocarbon group of the amide compound, which is a semisolid emulsifying compound, is in the unsaturated chain phase, the adhesion is increased. When the adhesiveness is increased, it can be applied to the sliding surface in a thin film state, and even in a severe lubrication environment, it is difficult to cause the oil film breakage, and the lubrication performance is improved. As the unsaturated chain hydrocarbon group, a bisamide compound which is an oleyl group having an unsaturated bond of carbon number 18 is preferable.

The amide compound is compounded in an amount of 0.1 to 90% by mass, preferably 1 to 50% by mass, more preferably 5 to 20% by mass, in the lubricant composition which is a semi-solid phase at room temperature at the finish. If the blending amount of the amide compound is less than this range, a gel-like composition can not be formed at room temperature, and if blended over this range, it becomes too hard and difficult to handle, which is not preferable.

[Preparation of lubricant composition]

The lubricant composition which is a semi-solid phase at room temperature of the present invention is not particularly limited, but it can be prepared by uniformly mixing the liquid base oil, the metal salt and the amide compound at the above-mentioned mixing ratio. For example, it can be obtained by measuring a predetermined amount of a liquid base oil, a metal salt and an amide compound, stirring them to obtain a homogeneous liquid state by heating at a temperature equal to or higher than the melting point, and then cooling to obtain a semisolid phase.

Additives such as known extreme pressure agents, corrosion inhibitors, abrasion preventing agents, waterproofing agents, antioxidants and antifoaming agents may be appropriately added to the composition of the present invention. Thiadiazole derivatives, benzotriazole and derivatives thereof as corrosion inhibitors, fatty acid partial esters and phosphorus compounds as waterproofing agents, and the like as antioxidants and anti-wear agents such as zinc dialkyldithiophosphate, sulfur compounds, Based compound, an amine-based compound, and a defoaming agent, a silicone compound, a PMA polymer, a pour point depressant, and a PMA polymer as a viscosity index improver. The various additives may be used in the form of a so-called additive package in which various kinds of additives are mixed in advance.

The lubricant composition of the present invention, which is a semi-solid phase at room temperature, is applied to a mechanical mechanism (sliding portion) requiring lubricating action. When sliding, the lubricant composition changes its state from the liquid by frictional heat, penetrates into the sliding portion, A thin film is formed on the surface of the solid constituting the portion to lubricate the sliding portion. When the sliding is stopped, the temperature is lowered, and the lubricant composition in the liquid state is returned to the semi-solid state (gel state) again. Further, the lubricant composition of the present invention is particularly suitable for extreme pressure service at a low speed and a high load by using high load, high dynamic friction coefficient, and continuing this excellent friction property for a long period of time. It is very suitable for a sliding portion of a device having a structure which is hard to be spread or a device which does not need to be opened once it is assembled. Further, since the gel (semi-solid) structure is reconstructed even when the lubricant composition of the present invention is repeatedly subjected to heating and cooling stress accompanying use and non-use, contamination due to oil leakage can be avoided, It is a long life.

Therefore, it can be sufficiently used as a substitute for the conventional liquid traction oil and can be applied to electric element mechanisms such as gears, belts, chains, wire ropes, hinges, and mechanical type continuously variable transmissions, have. Particularly preferable applications include a lap top PC of a retractable type requiring a desired angle maintenance, a hinge such as a cellular phone or an electronic dictionary, or a mechanical type continuously variable transmission that transmits power by a lubricant having a high dynamic friction coefficient.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

[Liquid base oil]

In order to prepare the lubricant compositions for Examples and Comparative Examples, the following three kinds of liquid base oils were used.

Base oil A: Synthetic naphthene (Techtrac M3Conc manufactured by TechChem)

Base oil B: Soft alkyl benzene (kinematic viscosity (40 캜): 32 mm 2 / s)

Base oil C:? -Olefin oligomer (SHF-400 from Mobil)

The physical properties of these three types of liquid base oils are shown in Table 1. In addition, additives such as an antioxidant and an anti-wear agent are mixed in a predetermined amount in the liquid base oil in advance, and have basic performance (oxidation prevention, abrasion prevention, etc.) as lubricating oil.

Base oil A Base oil B Base oil C The Synthetic naphthene Alkylbenzene ? -olefin oligomer Viscosity grade 1500 32 400 Density (15 ° C), g / cm 3 0.92 0.88 0.85 Kinematic viscosity
Mm2 / s (40 DEG C) 1520 32 400 (100 DEG C) 19.65 4.9 40 Viscosity index -209 69 150 % Ca 7 19 0 % Cn 62 12 0 % Cp 31 69 100

[Amide compound]

The following amide compounds were used to form a semi-solid state by mixing with a liquid base oil.

Amide A: Ethylene bis-oleic acid amide (Surfax O, melting point 119 ° C, manufactured by Nippon Chemical Co., Ltd.)

Amide B: Ethylene bisstearic acid amide (Surfax E, available from Nippon Chemical Co., Ltd., melting point 45 캜)

[Alkaline earth metal salt]

As alkaline earth metal salts, the following two kinds of compounds were used.

Ca sulfonate: 300 mgKOH / g of total base

Ca salicylate: total base 70 mgKOH / g

[Greece]

As a comparative example 4, commercially available lithium (Li) grease (Resinics grease No. 2, No. 2 (blending range of 265 to 295)) was used for comparison with the lubricant composition of the present invention.

[Preparation of lubricant composition]

(Ethylene naphthoic acid amide) and amide B (ethylenebisstearic acid amide) as the amide compound as the liquid base oil, and the base oil A (synthetic naphthene), base oil B (alkylbenzene) (Lubricant composition) of Examples 1 to 6 and Comparative Example 3 were prepared using Ca sulfonate and Ca salicylate as alkaline earth metal salts in the following procedure.

A predetermined amount of a liquid base oil, an alkaline earth metal salt, and an amide compound was weighed so as to obtain a total amount of about 100 ml of a boiling oil in terms of the ratio (mass%) to the finishing oil shown in the upper part of Table 2, Using a heater, the mixture was stirred while being warmed to the melting point or higher of the amide compound (melting point + 20 ° C). About 100 ml of the homogeneous solution was transferred to a heat-resistant glass container (inner diameter: 60 mm x height: 90 mm) and allowed to cool to obtain a semi-solid at room temperature in Examples 1 to 6 and Comparative Example 3 And a commercial lubricant composition were prepared.

Comparative Example 1 was a synthetic oil containing no amide compound and alkaline earth metal salt but only synthetic naphthene of Base Oil A and Comparative Example 2 contained no amide compound and was composed of synthetic naphthene and metal salt , And is a composition having a liquid lubricating property at room temperature. Comparative Example 4 is the commercial Li grease described above.

[Assessment Methods]

Evaluation tests (measurement of friction coefficient and the like) of the respective lubricant compositions of Examples 1 to 6 and Comparative Examples 1 to 4 were carried out according to the methods described below. The results are shown in Table 2 below.

(1) SRV test

A ball-on-disk type SRV friction tester specified in ASTM D5706 was used. A ball was made of a disk-shaped test piece having a diameter of 24 mm and a thickness of 7.85 mm, the material of which was SUJ-2, and the disk was made of SUJ-2. Further, the surface of the disk was subjected to a lapping finish having a roughness (Rz) of 0.45 to 0.65 mu m. The friction test was carried out at a load of 50 N, an amplitude of 50 Hz, an amplitude width of 1 mm, and a temperature of 40 ° C. The static friction coefficient immediately after the start of friction and the dynamic friction coefficient at the elapse of 15 minutes were measured, Respectively.

(2) Evaporation test

A sample of the liquid sample was left as it is, and a semi-solid sample was spread uniformly thinly and left in a high-temperature bath set at 120 DEG C, and each sample was weighed in a glass chalet having a diameter of 70 mm. The evaporation loss (mass%) was obtained from the mass change at the elapse of 200 hours.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Base oil A:
Synthetic naphthene 85 85 - 42 85 85 100 95 - - Base oil B:
Alkylbenzene - - 85 43 - - - - - - Base oil C:
? -olefin oligomer - - - - - - - - 85 - Amide A 2 2 2 2 10 - - - 2 - Amide B 8 8 8 8 - 10 - - 8 - Ca sulfonate 5 - 5 5 5 5 - 5 5 - Ca salicylate - 5 - - - - - - - - Commercial Li grease - - - - - - - - - 100 Evaporation test
Evaporation loss% 7 6 10 8 7 8 55 60 30 Oil separation 80 SRV test
Constant friction coefficient
Coefficient of friction
Abrasive wear ㎜
0.17
0.16
0.33
0.15
0.15
0.31
0.13
0.14
0.33
0.14
0.14
0.35
0.15
0.15
0.36
0.15
0.15
0.36
0.16
0.16
0.38
0.16
0.16
0.37
0.10
0.07
0.36
0.10
0.07
0.45

In Examples 1 to 6, a static friction coefficient of 0.13 to 0.17 and a dynamic friction coefficient of 0.14 to 0.16 in the SRV friction test, the static friction coefficient and the dynamic friction coefficient of the individual samples were the same value or almost the same value, The trace is as small as 0.31 to 0.36 mm and excellent in abrasion resistance.

On the other hand, in the liquid samples of Comparative Examples 1 and 2 using the base oil A at room temperature, both the static friction coefficient and the dynamic friction coefficient were 0.16. The width of the abrasion is 0.38 to 0.37 mm, which is slightly larger than that of the embodiment, but is excellent in abrasion resistance. However, Comparative Example 3 using base oil C and Comparative Example 4 of general-purpose lubricant showed a coefficient of friction of 0.10 and a coefficient of dynamic friction of 0.07, respectively, which were generally lower than those of the Examples. The abrasion shrinkage of the test specimens was as small as 0.36 mm in Comparative Example 3, but as 0.45 mm in Comparative Example 4, abrasion was observed.

It can be seen that the evaporation loss amounts of the semi-solid phase Examples 1 to 6 are much smaller than those of Comparative Examples 1 to 3. Despite the fact that the grease of Comparative Example 4 was semisolid, the amount of evaporation was the largest, and oil and thickener were separated at 120 DEG C for 200 hours.

From the above results, it can be seen from the above results that even a very small amount of lubricant exhibits a high dynamic friction coefficient and is excellent in abrasion resistance, and even if it is applied in a thin film form, it is difficult to evaporate under high temperature, .

As is apparent from the above, the lubricant composition, which is a semi-solid phase at room temperature according to the present invention, forms a thin film state with a very small amount of use and exhibits a high dynamic friction coefficient and excellent abrasion resistance and is hardly evaporated and lost, have. Particularly, a high coefficient of dynamic friction can be suitably applied to a mechanical system having an electric element mechanism such as a gear, a belt, a chain, a wire rope, a hinge, and a mechanical type continuously variable transmission, and is excellent in abrasion resistance, The loss is expected to contribute to the longevity of the mechanical system.

Claims (6)

At least one hydrocarbon base oil selected from alkyl naphthenes and alkylbenzenes having a% Cp of 70 or less at 70 to 93 mass%, at least one alkali metal selected from Ca sulphonate and Ca salicylate having 50 to 400 mg KOH / Wherein the lubricant composition is used in an electroluminescent element mechanism comprising 2 to 10 mass% of a earth metal salt and 5 to 20 mass% of at least one amide compound represented by the following formula (2), and being semi-solid at room temperature. (2) R ³ -CO-NH-A ¹ -NH-CO-R ⁴ (Wherein R ³ and R ⁴ are each independently a saturated or unsaturated straight chain hydrocarbon group having 12 to 20 carbon atoms and A ¹ is an alkylene group having 1 to 10 carbon atoms) The method according to claim 1, Wherein the amide compound represented by the general formula (2) is ethylene bis-oleic acid amide or ethylene bis-stearic acid amide. 3. The method according to claim 1 or 2, Wherein the electromechanical element mechanism is a hinge or a mechanical continuously variable transmission. delete delete delete