JP5411465B2 - Lubricant composition - Google Patents

Description

  The present invention relates to a lubricant composition containing tricalcium phosphate.

It is known that a lubricant composition containing tricalcium phosphate as a thickener is excellent in, for example, heat resistance (see Patent Document 1).
JP 05-093193 A

  By the way, although the lubricant composition containing tricalcium phosphate as a thickener has an advantage of excellent heat resistance and the like, depending on the kind of additive to be blended, for example, it is easily discolored when irradiated with sunlight. There is a problem. Even if the lubricating performance as the lubricant composition is maintained, such discoloration deteriorates the quality in appearance, and in addition, the lubricant composition adheres to, for example, the painted surface around the sliding portion. If left in a state, it may lead to discoloration of the painted surface.

  This invention is made | formed by finding the structure by which light resistance is exhibited in the lubricant composition containing tricalcium phosphate. An object of the present invention is to provide a lubricant composition that easily exhibits light resistance in a lubricant composition containing tricalcium phosphate.

In order to achieve the above object, the lubricant composition of the invention according to claim 1 comprises at least one base oil selected from mineral oil and synthetic oil, 0.2 to 18% by mass of a surfactant, and In the lubricant composition containing calcium triphosphate, the lubricant composition contains at least one organic compound selected from a first component and a second component, and the first component is 3,5-bis (1,1-dimethyl). -Ethyl) -4-hydroxy-benzenepropionic acid is a C7 to C9 branched alkyl ester, the second component is 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2-hydroxy-4 -n- octyloxy benzophenone, and selected from tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3,4-butane tetracarboxylate At least one type is, and summarized in that for use in equipment subjected to irradiation of sunlight or ultraviolet light that.

The invention according to claim 2, in the lubricating composition of claim 1, wherein the base oil is a synthetic oil, wherein the organic compound is pre Symbol a first component, before Symbol second component Including the above.

The invention described in claim 3 is the lubricant composition according to claim 1 or claim 2, the content of the organic compound is summarized in that a 0.1 to 10 mass%.

  According to the present invention, there is provided a lubricant composition that can easily exhibit light resistance when tricalcium phosphate is contained as a thickener.

  Hereinafter, embodiments embodying the lubricant composition of the present invention will be described in detail. The lubricant composition in the present embodiment contains at least one base oil selected from mineral oil and synthetic oil, and tricalcium phosphate as a thickener. This lubricant composition contains at least one organic compound selected from phenolic compounds, benzotriazole compounds, benzophenone compounds, and hindered amine compounds in order to enhance light resistance.

As the base oil, at least one selected from mineral oil and synthetic oil can be appropriately selected according to physical properties such as consistency required for the lubricant composition. The kinematic viscosity of the base oil is preferably in the range of ^{2 to} 40 mm ² / s at 100 ° C., for example.

  Mineral oil is obtained by further refining a lubricating oil fraction obtained by atmospheric distillation of crude oil. Examples of the purification means include solvent purification, hydrorefining, dewaxing, hydrocracking and the like. Examples of the mineral oil include paraffinic mineral oil and naphthenic mineral oil. Specifically, at least one selected from mineral oils belonging to Group 1, Group 2, and Group 3 in a base oil category defined by API (American Petroleum Institute) can be used.

  Specific examples of the synthetic oil include polyolefin oil, synthetic ester oil, synthetic ether oil, alkylbenzene oil, alkylnaphthalene oil, fluorine-containing compounds (perfluoropolyether, fluorinated polyolefin, etc.), silicone oil and the like. Examples of the polyolefin oil include polymers of various olefins or hydrogenated products of the polymers. Examples of the olefin constituting the polyolefin oil include ethylene, propylene, 1-butene, and α-olefins having 5 or more carbon atoms.

  Examples of the synthetic ester oil include hindered ester oil (polyol ester oil), dibasic acid diester oil, and polyoxyalkylene glycol ester oil. Hindered ester oil is an ester of a polyhydric alcohol and a fatty acid. Specific examples of the polyhydric alcohol forming the hindered ester oil include neopentyl glycol, trimethylol propane, pentaerythritol, dipentaerythritol and the like. Specific examples of the fatty acid forming the hindered ester include saturated or unsaturated fatty acids having 7 to 18 carbon atoms, oleic acid and the like. A dibasic acid diester oil is an ester of an aliphatic dibasic acid and a monohydric alcohol. Specific examples of the aliphatic dibasic acid forming the dibasic acid diester oil include adipic acid, azelaic acid, sebacic acid, dodecanoic acid, phthalic acid, and dimer acid. Specific examples of the monohydric alcohol forming the dibasic acid diester oil include octyl alcohol, 2-ethylhexyl alcohol, isononyl alcohol, isodecyl alcohol, and tridecyl alcohol. Specific examples of such dibasic acid diester oils include dioctyl sebacate (DOS), dioctyl azelate (DOZ), dioctyl adipate (DOA), and the like. Specific examples of the polyoxyalkylene glycol ester include polyoxyethylene sorbitan fatty acid ester and polyoxyethylene glycerin fatty acid ester.

Examples of the synthetic ether oil include polyoxyalkylene glycol ether oil, polyphenyl ether oil, and dialkyl diphenyl ether oil.
Among the mineral oils and synthetic oils, from the viewpoint that the light resistance can be further improved, the base oil preferably includes a polyolefin oil, and more preferably includes a poly α-olefin oil.

The content of the base oil in the lubricant composition is preferably 30% by mass or more, more preferably 40% by mass or more.
Ca ₃ (PO ₄ ) ₂ can be used as the tricalcium phosphate. In addition, a compound having a hydroxyapatite chemical structure represented by [Ca ₃ (PO ₄ ) ₂ ] ₃ · Ca (OH) ₂ is preferably used.

  The content of tricalcium phosphate in the lubricant composition can be appropriately adjusted so as to have a consistency suitable for the use of the lubricant composition. The content of tricalcium phosphate in the lubricant composition is preferably 2 to 68% by mass, more preferably 5 to 60% by mass, and still more preferably 8 to 55% by mass. When the content of tricalcium phosphate in the lubricant composition is 2 to 68% by mass, it is easy to adjust the consistency.

Next, the organic compound contained in the lubricant composition will be described.
Examples of the phenol compound include C5-C9 branched alkyl ester of 3,5-bis (1,1-dimethyl-ethyl) -4-hydroxy-benzenepropionic acid, 2-t-butylphenol, 2-t-butyl-4. -Methylphenol, 2-t-butyl-5-methylphenol, 2,4-di-t-butylphenol, 2,4-dimethyl-6-t-butylphenol, 2-t-butyl-4-methoxyphenol, 3- t-butyl-4-methoxyphenol, 2,5-di-t-butylhydroquinone, 2,6-di-t-butyl-4-alkylphenol, 2,6-di-t-butyl-4-alkoxyphenol, 3 , 5-Di-tert-butyl-4-hydroxybenzyl mercaptooctyl acetate, alkyl-3- (3,5-di-tert-butyl-4-hydro Ciphenyl) propionate, 2,6-di-t-butyl-α-dimethylamino-p-cresol, 2,2′-methylenebis (4-alkyl-6-t-butylphenol), bisphenol, polyphenol, p-t-butylphenol -Formaldehyde condensates and pt-butylphenol-acetaldehyde condensates.

  Examples of 2,6-di-t-butyl-4-alkylphenol include 2,6-di-t-butylphenol, 2,6-di-t-butyl-4-methylphenol and 2,6-di-t-phenol. And butyl-4-ethylphenol.

  Examples of 2,6-di-t-butyl-4-alkoxyphenol include 2,6-di-t-butyl-4-methoxyphenol and 2,6-di-t-butyl-4-ethoxyphenol. .

  Examples of alkyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate include n-octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, n -Butyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate and 2'-ethylhexyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate .

  Examples of 2,2′-methylenebis (4-alkyl-6-tert-butylphenol) include 2,2′-methylenebis (4-methyl-6-tert-butylphenol) and 2,2′-methylenebis (4-ethyl- 6-t-butylphenol).

  Examples of the bisphenol include 4,4′-butylidenebis (3-methyl-6-tert-butylphenol), 4,4′-methylenebis (2,6-di-tert-butylphenol), 4,4′-bis (2, 6-di-t-butylphenol), 2,2- (di-p-hydroxyphenyl) propane, 2,2-bis (3,5-di-t-butyl-4-hydroxyphenyl) propane, 4,4 ′ -Cyclohexylidenebis (2,6-t-butylphenol), hexamethylene glycol-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], triethylene glycol bis [3- ( 3-tert-butyl-4-hydroxy-5-methylphenyl) propionate], 2,2′-thio- [diethyl-3- (3,5-di-tert-butyl-4-hydro Xylphenyl) propionate], 3,9-bis {1,1-dimethyl-2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl} 2,4,8,10 -Tetraoxaspiro [5,5] undecane, 4,4'-thiobis (3-methyl-6-tert-butylphenol) and 2,2'-thiobis (4,6-di-tert-butylresorcinol) .

  Examples of the polyphenol include tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane, 1,1,3-tris (2-methyl-4-hydroxy-5-t). -Butylphenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, bis- [3,3'-bis (4 '-Hydroxy-3'-t-butylphenyl) butyric acid] glycol ester, 2- (3', 5'-di-t-butyl-4-hydroxyphenyl) methyl-4- (2 ", 4" -di- t-butyl-3 "-hydroxyphenyl) methyl-6-t-butylphenol and 2,6-bis (2'-hydroxy-3'-t-butyl-5'-methylbenzyl) -4-methylphenol. The

  A phenol type compound may be contained independently and may be contained in combination of multiple types. Among phenolic compounds, C7-C9 branched alkyl esters of 3,5-bis (1,1-dimethyl-ethyl) -4-hydroxy-benzenepropionic acid are preferred.

  Examples of the benzotriazole compound include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3', 5'-di-tert-butyl-5'-methylphenyl) -5 -Chlorobenzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butyl-5'-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3', 5 '-Di-tert-butyl-5'-amylphenyl) benzotriazole, 2- [2'-hydroxy-3'-(3 ", 4", 5 ", 6" -tetrahydrophthalimidome ) -5'-methylphenyl] benzotriazole, 3- (5-chloro-2H-benzotriazol-2-yl) -5- (1,1-dimethylethyl) -4-hydroxy-benzenepropanol, 3- ( 2H-benzotriazol-2-yl) -4-hydroxy-benzeneethanol, 3- (5-methyl-2H-benzotriazol-2-yl) -5- (1-methylethyl) -4-hydroxy-benzenepropanol, And 1,1-bis- [2-hydroxy-3- (2H-benzotriazol-2-yl) -5- (2-hydroxyethyl) -phenyl] methane.

A benzotriazole type compound may be contained independently and may be contained in combination of multiple types.
Examples of the benzophenone compound include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, Bis (5-benzoyl-4-hydroxy-2-methoxyphenyl) methane and 1,4-bis (4-benzoyl-3-hydroxyphenone) -butane.

A benzotriazole type compound may be contained independently and may be contained in combination of multiple types.
Examples of the hindered amine compound include 3-dodecyl-1- (2,2,6,6-tetramethyl-4-piperidinyl) pyrrolidine-2,5-dione, N-methyl-3-dodecyl-1- (2, 2,6,6-tetramethyl-4-piperidinyl) pyrrolidine-2,5-dione, N-acetyl-3-dodecyl-1- (2,2,6,6-tetramethyl-4-piperidinyl) pyrrolidine-2 , 5-dione, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, tetrakis (2, 2,6,6-tetramethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3 4 Butanetetracarboxylate, 1,2,3,4-butanetetracarboxylic acid and 2,2,6,6-tetramethyl-piperidinol and tridecanol condensate, 1,2,3,4-butanetetracarboxylic acid and 1,2,2,6,6-pentamethyl-4-piperidinol and tridecanol condensate, 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro [4 , 5] decane-2,4-dione, 1,2,3,4-butanetetracarboxylic acid and 1,2,2,6,6-pentamethyl-4-piperidinol and β, β, β ′, β′- Condensates with tetramethyl-3,9- (2,4,8,10-tetraoxaspiro [5,5] undecane) diethanol, and 1,2,3,4-butanetetracarboxylic acid with 2,2, 6,6-pentame And a condensation product of ru-4-piperidinol and β, β, β ′, β′-tetramethyl-3,9- (2,4,8,10-tetraoxaspiro [5,5] undecane) diethanol. .

A hindered amine-type compound may be contained independently and may be contained in combination of multiple types.
The lubricant composition preferably includes a first component composed of a phenol compound and a second component composed of at least one selected from a benzotriazole compound, a benzophenone compound, and a hindered amine compound. The phenolic compound as the first component is contained in the lubricant composition containing the synthetic oil as the base oil and the tricalcium phosphate as the thickener, thereby oxidizing the lubricant composition. Suppress. By including the second component in such a lubricant composition, the light resistance of the lubricant composition can be further improved.

  The content of the organic compound in the lubricant composition is preferably 0.1 to 10% by mass, more preferably 1 to 10% by mass, when the entire lubricant composition is 100% by mass. When the content of the organic compound in the lubricant composition is 0.1 to 10% by mass, it is easy to exhibit excellent light resistance, and the organic compound affects physical properties other than light resistance. Can be suppressed as much as possible.

  The lubricant composition preferably contains a surfactant from the viewpoint of enhancing its water resistance. The water resistance of the lubricant composition is enhanced by the action of the hydrophilic group of the surfactant adsorbing water. Surfactants are classified into anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. Surfactants may be contained alone or in combination of two or more.

  Among the surfactants, nonionic surfactants are preferable, and fatty acid ester surfactants are more preferable. The fatty acid ester-based surfactant tends to hardly inhibit the action and effect due to the inclusion of the organic compound.

  The fatty acid ester surfactant is preferably at least one selected from glycerin fatty acid ester, sorbitan fatty acid ester and sucrose fatty acid ester, more preferably from the viewpoint that affinity for the above base oil and tricalcium phosphate is easily obtained. Sorbitan fatty acid ester.

As the fatty acid of the fatty acid ester surfactant, a saturated fatty acid having 12 to 22 carbon atoms or an unsaturated fatty acid having 12 to 22 carbon atoms is preferable.
Examples of the glycerin fatty acid ester include stearic acid monoglyceride, oleic acid monoglyceride, stearic acid, and mono-diglyceride of oleic acid. Examples of the sorbitan fatty acid ester include sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan tristearate, sorbitan trioleate and the like. Examples of the sucrose fatty acid ester include sucrose palmitate ester and sucrose stearate ester.

  The surfactant content in the lubricant composition is preferably 0.2 to 18% by mass, more preferably 1 to 15% by mass, and still more preferably 2 to 10% by mass. When the content of the surfactant in the lubricant composition is less than 18% by mass, the consistency adjustment becomes easy and economically advantageous. Further, the content of the surfactant in the lubricant composition is preferably 1 to 40 parts by mass, more preferably 2 to 30 parts by mass, and further preferably 5 to 20 parts by mass with respect to 100 parts by mass of the tricalcium phosphate. Part. When the content of the surfactant in the lubricant composition is 1 to 40 parts by mass with respect to 100 parts by mass of tribasic calcium phosphate, the consistency adjustment is easy and economically advantageous.

  In the lubricant composition, rust preventives, extreme pressure agents, antiwear agents, solid lubricants, antibacterial agents, additives other than the above organic compounds, etc., as necessary, may be used as long as the effects of the present embodiment are not impaired. It can be included.

  In addition, it is preferable not to contain organic amine compounds other than a hindered amine type compound in a lubricant composition from a viewpoint of maintaining the light resistance of the composition. Examples of organic amine compounds include naphthylamine compounds, phenylenediamine compounds, diphenylamine compounds, and phenothiazine compounds.

  The lubricant composition can be prepared by mixing the base oil, tricalcium phosphate, and the organic compound according to a conventional method. When preparing the lubricant composition, it may be appropriately heated. Moreover, when preparing a lubricant composition, it is suitable to mix using a roll mill etc. from a viewpoint of disperse | distributing tribasic calcium phosphate efficiently. The lubricant composition thus configured is in a semi-solid state and is used for various machines having sliding parts such as bearings.

  Here, the lubricant composition may turn brown when irradiated with sunlight, for example. Even if the lubricating performance as a lubricant composition is maintained, such browning deteriorates the quality in appearance, and in addition, the lubricant composition adheres to, for example, the painted surface around the sliding portion. If left in a state, it may cause discoloration of the painted surface. Such browning and defects based thereon are easily affected by various additives. In particular, a lubricant composition containing tricalcium phosphate may be easily affected by various additives. In this regard, the lubricant composition of the present embodiment contains the organic compound. For this reason, the light resistance of the lubricant composition containing the base oil and tricalcium phosphate can be exhibited.

  The lubricant composition of the present embodiment can be suitably used as a lubricant for various machines installed or used outdoors because light resistance is exhibited by the above-described configuration. Outdoor applications include, for example, automobiles, civil engineering machinery, chain saws, outdoor windmills, movable parts of solar cells, outboard motors, agricultural machinery (tractors, rice transplanters, tillers, combines, etc.), railways (branches, railcars) Movable parts, etc.). Note that the lubricant composition of the present embodiment is not limited to outdoor use, and can be suitably used as a lubricant in, for example, an ultraviolet sterilizer and semiconductor manufacturing equipment, even indoors.

The effects exhibited by this embodiment will be described below.
(1) The lubricant composition of the present embodiment contains at least one organic compound selected from phenolic compounds, benzotriazole compounds, benzophenone compounds, and hindered amine compounds. According to this structure, light resistance can be exhibited. Therefore, in the lubricant composition of this embodiment, since the malfunction that the same composition browns, for example with irradiation of sunlight, is suppressed, the quality on the external appearance of the same composition comes to be maintained. In addition, even when the lubricant composition is left in a state where it adheres to the painted surface around the sliding site, for example, it is possible to suppress the problem that the painted surface changes color due to the browning of the composition.

  (2) When oxidation of the lubricant composition proceeds, physical properties such as consistency may change. In this respect, the phenolic compound as the first component is contained in the lubricant composition containing the synthetic oil as the base oil and the tricalcium phosphate as the thickener, Oxidation is suppressed. Therefore, the malfunction which arises based on the oxidation of a lubricant composition can be suppressed. Furthermore, the light resistance of the lubricant composition can be further improved by adding the second component to the lubricant composition.

  (3) The lubricant composition contains a C7 to C9 branched alkyl ester of 3,5-bis (1,1-dimethyl-ethyl) -4-hydroxy-benzenepropionic acid as a phenolic compound. preferable. In this case, oxidation of the lubricant composition can be suppressed and light resistance can be exhibited.

  (4) The content of the organic compound in the lubricant composition is preferably 0.1 to 10% by mass. When comprised in this way, it is easy to obtain the outstanding light resistance, and it can suppress as much as possible that an organic compound influences on physical properties other than light resistance.

The technical idea that can be grasped from the above embodiment will be described below.
A lubricant composition that does not contain an organic amine compound other than the hindered amine compound.

  The lubricant composition, wherein the organic amine compound is at least one compound selected from naphthylamine compounds, phenylenediamine compounds, diphenylamine compounds, and phenothiazine compounds.

Next, the embodiment will be described more specifically with reference to examples and comparative examples.
(Examples 1-4)
A base oil, tribasic calcium phosphate, an organic compound, and the like were charged into a prototype kettle, heated to 100 ° C. and stirred in the trial kettle, and then kneaded in a three-roll mill to prepare a lubricant composition. Table 1 shows the content of each component contained in the lubricant composition in mass%. The details of each component shown in Table 1 are as follows.

Mineral oil is a solvent refined base oil of paraffinic mineral oil, and its properties are as follows. The kinematic viscosity at 40 ° C. is 472.6 mm ² / s, the kinematic viscosity at 100 ° C. is 31.24 mm ² / s, the viscosity index is 96, and the pour point is −15 ° C.

Tricalcium phosphate has a chemical structure of hydroxyapatite represented by [Ca ₃ (PO ₄ ) ₂ ] ₃ · Ca (OH) ₂ .
The phenolic compound is a hindered phenol compound 3,5-bis (1,1-dimethyl-ethyl) -4-hydroxy-benzenepropionic acid, C7 to C9 branched alkyl ester (Ciba Specialty Chemicals, trade name: Irganox L135).

The benzotriazole-based compound is 2- (2′-hydroxy-5′-methylphenyl) benzotriazole (manufactured by ADEKA Corporation, trade name: ADK STAB LA-32).
The benzophenone compound is 2-hydroxy-4-n-octyloxybenzophenone (trade name: ADK STAB 1413, manufactured by ADEKA Corporation).

  The hindered amine compound is tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate (manufactured by ADEKA Corporation, trade name: ADK STAB LA-52). is there.

The surfactant is sorbitan trioleate.
(Comparative Examples 1 and 2)
In Comparative Examples 1 and 2, a lubricant composition was prepared in the same manner as in each Example except that the composition was changed to the composition shown in Table 1.

(Examples 5-7)
In Examples 5 to 7, lubricant compositions were prepared in the same manner as in Examples 1 to 4 except that the compositions shown in Table 2 were changed. Table 2 shows the content of each component contained in the lubricant composition in mass%. In addition, the synthetic oil in Table 2 is a poly alpha olefin oil (PAO40), and the property is as follows. The kinematic viscosity at 40 ° C. is 400 mm ² / s, the kinematic viscosity at 100 ° C. is 40 mm ² / s, the viscosity index is 152, and the pour point is −39 ° C.

Details of the organic compounds and surfactants shown in Table 2 are the same as those described in Examples 1-4.
<Discoloration test of composition and painted surface>
A coated plate was prepared by subjecting a steel plate to acrylic baking coating. The lubricant composition of each example was placed on the coated surface of the coated plate so as to form a disk shape having a diameter of about 8 mm and a thickness of 2 mm. Artificial sunlight was irradiated to the composition on the painted surface for 7 days using an artificial solar illuminating lamp (manufactured by Celick, model: SXL-5004V4S type). The illuminance of natural sunlight is about 30,000 lux on average per day. The illuminance of artificial sunlight irradiated from the artificial solar lighting lamp exceeds 30,000 lux, and the spectral distribution of the artificial sunlight is very close to the spectral distribution of natural sunlight.

Thus, after irradiating artificial sunlight, the discoloration degree of a composition was evaluated in four steps according to the following evaluation criteria.
(Evaluation criteria)
Almost no discoloration: Rating “3”
Slight discoloration observed: Rating “2”
Discoloration observed: Rating “1”
Strong discoloration (black discoloration) is recognized: Evaluation “0”
Next, after the composition subjected to the above-described discoloration test was completely wiped off with absorbent cotton and removed, the degree of discoloration of the painted surface was evaluated in four stages according to the above evaluation criteria.

  The composition of each example and the evaluation results of the painted surface are also shown in each table.

表１及び表２の結果から明らかなように、各実施例では組成物及び塗装面のいずれについても、変色試験の結果は“２”又は“３”である。これに対して、比較例１及び２では、各実施例と同様に第三リン酸カルシウムを増ちょう剤として含有する潤滑剤組成物であるものの、組成物の変色試験の結果は“０”であった。こうした結果から、各実施例の潤滑剤組成物では耐光性が発揮されることがわかる。

As is clear from the results in Tables 1 and 2, in each Example, the result of the discoloration test is “2” or “3” for both the composition and the painted surface. On the other hand, in Comparative Examples 1 and 2, the lubricant composition containing tricalcium phosphate as a thickening agent was used as in each Example, but the result of the discoloration test of the composition was “0”. . From these results, it can be seen that the lubricant composition of each example exhibits light resistance.

  Moreover, in Examples 5-7, the 1st component which consists of a phenolic compound and the 2nd component which consists of at least 1 type chosen from a benzotriazole type compound, a benzophenone type compound, and a hindered amine type compound are included. . It turns out that the lubricant composition of Examples 5-7 is excellent in the effect which suppresses discoloration of a coating surface.

Claims (3)

In a lubricant composition comprising at least one base oil selected from mineral oil and synthetic oil, 0.2 to 18% by mass of a surfactant , and tricalcium phosphate,
Containing at least one organic compound selected from the first component and the second component;
The first component is a C7-C9 branched alkyl ester of 3,5-bis (1,1-dimethyl-ethyl) -4-hydroxy-benzenepropionic acid,
The second component comprises 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2-hydroxy-4-n-octyloxybenzophenone, and tetrakis (1,2,2,6,6-pentamethyl -4-piperidyl) A lubricant composition that is at least one selected from 1,2,3,4-butanetetracarboxylate , and is used in equipment that is irradiated with sunlight or ultraviolet light . Wherein the base oil is a synthetic oil, wherein the organic compound is pre Symbol lubricant composition according to claim 1, characterized in that it comprises a first component, and a pre-Symbol second component. The organic compound lubricant composition according the content is 0.1 to 10% in any one of claims 1 or claim 2, wherein the.