DE112014003161T5 - Lubricant composition for chains, and chains - Google Patents

Abstract

A lubricant composition for a chain includes a base oil, a thickener and a corrosion inhibitor. The lubricant composition has a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1 mass%, and an aromatic content of not more than 1 mass%.

Description

FIELD OF TECHNOLOGY

 The present invention relates to a lubricant composition for a chain and a chain to which it is applied.

GENERAL PRIOR ART

 A lubricant composition for a chain containing a base oil and a thickening agent is known. For example, Patent Document 1 discloses a lubricant composition containing a wax as a thickener. The lubricant composition has a consistency of 60 to 475 and a dropping point of 60 ° C to 120 ° C when measured according to the measuring methods of Japanese Industrial Standard (JIS) K 2220.

DOCUMENT OF THE PRIOR ART

Patent document

• Patent Document 1: Japanese Patent Publication No. 2009-144005

SUMMARY OF THE INVENTION

THE PROBLEMS CONTAINED IN THE INVENTION

 The appearance of a warp is occasionally degraded by the fact that a lubricant composition applied to the warp turns black. If a blackened lubricant composition is splashed into the environment during use of the warp, it can easily be left behind by significant stains. Patent Document 1 teaches nothing to improve blackening of a chain.

 An object of the present invention is to provide a lubricant composition for a chain capable of suppressing blackening of a chain and a chain to which the lubricant composition is applied.

Means of solving the problem

According to another aspect of the present invention, a lubricant composition for a chain comprises a base oil, a thickener and a corrosion inhibitor, wherein the lubricant composition has a sulfur content of not more than 100 ppm, a phosphorus content of not more than 1 mass% and an aromatic content of not more than 1 mass%.

 The inventor has discovered that a lubricant composition containing sulfur and / or phosphorus and / or aromatic components in at least a predetermined concentration turns slightly black by heating. In other words, the blackening caused by the sulfur, phosphorus and aromatic components is suppressed when a lubricant composition has a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1 mass% and an aromatic content of not has more than 1 mass%.

 Preferably, the lubricant composition further comprises an oily agent, wherein the oily agent preferably comprises a compound having a sulfur content of not more than 100 ppm, a phosphorus content of not more than 1% by mass and an aromatic content of not more than 1% by mass.

 Preferably, the oily agent in the lubricant composition comprises at least one selected from a fatty acid ester and a lanolin fatty acid alcohol ester.

 The lubricant composition is preferably for use in a chain dipping vessel.

Thus, in another aspect of the present invention, there is provided a chain to which the lubricant composition is applied.

EFFECT OF THE INVENTION

 According to the present invention, blackening of a chain can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic exploded view of a portion of a chain in one embodiment.

2 is a schematic partial cross-sectional view of a chain.

MODES OF CARRYING OUT THE INVENTION

 An embodiment of the lubricant composition of the chain will be described below.

 The lubricant composition contains a base oil, a thickener and a corrosion inhibitor. The lubricant composition has a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1 mass%, and an aromatic content of not more than 1 mass%.

<Base Oil>

 Preferably, the base oil has a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1 mass%, and an aromatic content of not more than 1 mass%. The base oil is preferably at least one selected from a mineral oil and a synthetic oil. A mineral oil having a low sulfur content and substantially no phosphorus and no aromatic components is suitable. Such a mineral oil can be selected from commercially available process oils. Ingredients of the mineral oil may include a paraffinic hydrocarbon, such as liquid paraffin. The paraffinic hydrocarbon has a paraffinic carbon content (% CP) of 50 or more as determined by ring analysis using the n-d-M method.

 Examples of the synthetic oil include synthetic hydrocarbons (such as poly-α-olefins (PAOs), co-oligomers of ethylene and α-olefins and polybutene), esters, polyphenyl ethers, polyalkylene glycols, silicones and fluorohydrocarbons. Examples of the esters include hindered esters (such as dibasic acid esters and polyol esters), diesters and silicate esters.

 The lubricant composition may contain one or more base oils.

 The proportion of the base oil in the lubricant composition is preferably 70 mass% or more.

<Thickeners>

 The thickener is at a normal temperature (25 ° C) in the solid state. When the thickener is dispersed or dissolved in the base oil, it increases the viscosity of the base oil. The thickening agent preferably comprises a compound having a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1% by mass, and an aromatic content of not more than 1% by mass. Preferably, at least one selected from a polymerized polyethylene wax and a polymer is used as the thickening agent. Examples of the polymer include polymethacrylate and polyisobutylene.

 The lubricant composition may contain one or more thickeners.

 The proportion of the thickening agent in the lubricant composition is preferably 1 mass% or more. The proportion of the thickening agent in the lubricant composition is preferably 25 mass% or less.

<Corrosion protection>

The anticorrosion agent preferably comprises a compound having a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1% by mass and an aromatic content of not more than 1% by mass. Examples of the anti-corrosion agent which can be used with advantage include a sorbitan-based corrosion inhibitor, a lanolin-based corrosion inhibitor, a succinic acid-based anticorrosion agent, an amine-based anticorrosive agent, and a metal soap.

 Examples of the sorbitan-based corrosion inhibitor include sorbitan fatty acid esters (such as sorbitan monooleate and sorbitan tristearate).

 Examples of the lanolin-based corrosion inhibitor include lanolin fatty alcohols and lanolin fatty acid alcohol esters.

 Examples of the succinic acid-based corrosion inhibitor include alkylsuccinic acid derivatives such as alkylsuccinic anhydrides.

 Examples of the amine-based anticorrosive agent include amine salts of organic acids and amine salts of fatty acids.

 Examples of the metal soap include a lanolin fatty acid soap.

 The lubricant composition may contain one or more corrosion inhibitors. The corrosion inhibitor preferably contains a sorbitan fatty acid ester.

 The proportion of the anticorrosion agent in the lubricant composition is preferably 1 mass% or more. The proportion of the anticorrosion agent in the lubricant composition is preferably 10 mass% or less.

<Other ingredients>

An oily agent may be added to the lubricant composition.

 The oily active ingredient preferably comprises a compound having a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1% by mass and an aromatic content of not more than 1% by mass.

Examples of the oily active ingredient include fatty acid esters, lanolin fatty acid alcohol esters, long-chain fatty acids, long-chain fatty acid salts, organic alcohols and alkylamines. The fatty acid esters can be represented by the following general formula (1). R ¹ COOR ² (1) wherein R ^{1 is} a saturated or unsaturated C ₇ to C ₁₈ alkyl group and R ^{2 is} a C ₁ to C ₄ alkyl group.

 Examples of the lanolin fatty acid alcohol ester include lanolin fatty acid lanolin alcohol ester (trade name: ECOLANO LY, LC, manufactured by Nippon Fine Chemical Co., Ltd.) and lanolin fatty acid pentaerythritol ester (trade name: NEOCOAT EPS-2, EPS-24, manufactured by Nippon Fine Chemical Co., Ltd.) , The lanolin fatty acid alcohol ester also serves to enhance the anti-corrosion effect.

Examples of the long-chain fatty acid include saturated or unsaturated C ₇ to C ₁₇ fatty acids. Examples of the long-chain fatty acid include stearic acid and oleic acid. Examples of the organic alcohol include lauryl alcohol. Examples of the alkylamine include stearylamine.

 The lubricant composition may contain one or more oily agents.

 The lubricant composition preferably contains the oily agent. More preferably, the oily agent comprises at least one selected from a fatty acid ester and a lanolin fatty acid alcohol ester.

The proportion of the oily agent in the lubricant composition is preferably in a range between 1 mass% and 10 mass%. More preferably, the lubricant composition contains a fatty acid ester in a range between 1 mass% and 10 mass%.

 If necessary, a high pressure active, an antioxidant and a defoamer may be added to the lubricant composition.

<Contents of Sulfur, Phosphorus and Aromatic Compounds on the Lubricant Composition>

 The sulfur content of the lubricant composition can be determined quantitatively, for example, by the method given in JIS K2541. The phosphorus content of the lubricant composition can be determined quantitatively, for example by plasma emission spectrometry. The aromatic content of the lubricant composition can be determined quantitatively, for example by ring analysis using the n-d-M method.

<Method for producing the lubricant composition>

The lubricant composition is prepared by mixing a base oil, a thickening agent and a corrosion inhibitor with a known stirring device. The oily agent, etc. may be added to the lubricant composition at the same time as needed. The preparation of the lubricant composition is preferably carried out at or above the melting temperature of the thickener.

<Structure of the chain>

As in 1 is shown is a chain 11 the embodiment, a roller chain, which is designed such that an inner member 21 and an outer link 31 which are adjacent to each other, are rotatably connected to each other.

The inner link 21 indicates: two inner plates 22 . 23 facing each other, cylindrical bushings 24 . 25 which are the inner plates 22 . 23 wear, and cylindrical rollers 26 . 27 which rotate around the sockets 24 . 25 are arranged around.

The inner plates 22 . 23 be due to the connection with the jacks 24 . 25 kept apart.

The inner plate 22 has through holes 22a . 22b at both ends in the longitudinal direction of the chain 11 on. Likewise, the inner plate 23 through holes 23a . 23b at both ends. The bore of the socket 24 passes through the through holes 22a . 23a and opens to the outer surfaces facing the facing surfaces of the inner plates 22 . 23 are opposite. Likewise, the bore of the socket runs 25 through the through holes 22b . 23b and opens to the outer surfaces facing the facing surfaces of the inner plates 22 . 23 are opposite.

The outer limb 31 has two facing outer plates 32 . 33 and two massive cylindrical pins 34 . 35 on, the outer plates 32 . 33 connect. The outer plates 32 . 33 be due to the connection with the pins 34 . 35 kept apart.

The cones 34 . 35 be in the socket 25 of the inner limb 21 or the socket 24 another inner member 21 adjacent to the former inner member 21 is arranged, introduced. In this way are the adjacent inner links 21 over an outer link 31 connected with each other.

As in 2 are shown are gaps between the outer peripheries of the pins 34 . 35 and the inner circumferences of the sockets 24 . 25 educated. The chain 11 can be formed for example of a steel material.

<Use and Effect of Lubricating Composition>

The lubricant composition becomes, for example, thereby on the chain 11 applied that chain 11 is dipped in the lubricant composition to the lubricant composition between the outer peripheries of the pins 34 . 35 and the inner circumferences of the sockets 24 . 25 bring to. The lubricant composition is preferably maintained at or above the thickening temperature of the thickener during dipping. The lubricant composition becomes, for example, thereby on the chain 11 applied that chain 11 is dipped in the lubricant composition to the lubricant composition between the outer peripheries of the pins 34 . 35 and the inner circumferences of the sockets 24 . 25 bring to.

For immersion, a chain dipping vessel is used. In the vessel, the lubricant composition is maintained in a heated state. After being dipped in the heated lubricant composition for a predetermined period of time, the chain becomes 11 transported from the vessel, and then a new chain 11 immersed in the lubricant composition in the vessel. In this way, the application of the lubricant composition to the chain 11 , that is the lubrication, repeated in the chain dipping vessel. Fresh lubricant composition will vary depending on the amount of lubricant composition that is applied by the chains 11 is consumed, filled up.

 The lubricant composition of the embodiment contains substantially no or only a very low concentration of sulfur, phosphorus and aromatic components which can cause blackening. Therefore, even if the lubricant composition is held in the chain dipping vessel for a long period of time, blackening of the lubricant composition is suppressed. In other words, a lubricant composition of the embodiment in a heated state can easily maintain its original color (for example, brown or light brown).

The chain 11 is used, for example, for transporting an object or for transmitting power. The chain 11 For example, it is used in a state where it is wound around a plurality of pinions. In this case, for example, the lubricant composition lubricates the spaces between the outer peripheries of the pins 34 . 35 and the inner circumferences of the sockets 24 . 25 ,

• (1) Die Schmiermittelzusammensetzung enthält ein Basisöl ein Verdickungsmittel und ein Korrosionsschutzmittel und weist einen Massenanteil von Schwefel von nicht mehr als 100 ppm, einen Phosphoranteil von nicht mehr als 1 Massen% und einen Aromatenanteil von nicht mehr als 1 Massen% auf. Mit dieser Beschaffenheit kann eine Schwärzung der Schmiermittelzusammensetzung, wie sie durch Schwefel-, Phosphor- und aromatische Bestandteile bewirkt wird, unterdrückt werden. Daher kann ein Schwärzung der Kette 11, auf die die Schmiermittelzusammensetzung aufgebracht wird, unterdrückt werden, und die Kette 11 mit einem vorteilhaften Erscheinungsbild kann erhalten werden.
• (2) Die Schmiermittelzusammensetzung enthält ferner einen öligen Wirkstoff, der vorzugsweise eine Verbindung mit einem Massenanteil von Schwefel von nicht mehr als 100 ppm, einem Phosphoranteil von nicht mehr als 1 Massen% und einem Aromatenanteil von nicht mehr als 1 Massen% umfasst. Mit dieser Beschaffenheit kann beispielsweise auch dann, wenn der ölige Wirkstoff zu der Schmiermittelzusammensetzung zugegeben wird, um die Haltbarkeit der Kette zu verbessern, ein Schwärzung der Kette 11 unterdrückt werden. Es ist günstig, wenn der ölige Wirkstoff beispielsweise einen Fettsäureester und/oder einen Lanolinfettsäurealkoholester enthält.
• (3) Das Korrosionsschutzmittel, das der Schmiermittelzusammensetzung zugegeben werden soll, enthält vorzugsweise einen Sorbitanfettsäureester. Unter anderen Korrosionsschutzmitteln kann ein Sorbitanfettsäureester eine Korrosionsschutzwirkung in einer relativ kleinen Menge zeigen. Da ein Sorbitanfettsäureester im Wesentlichen keine Schwefel-, Phosphor- und aromatischen Bestandteile enthält, kann eine Schwärzung der Schmiermittelzusammensetzung, wie sie durch Schwefel-, Phosphor- und aromatische Bestandteile bewirkt wird, unterdrückt werden.
• (4) Ein Sorbitanfettsäureester eines Lanolinfettsäurealkoholesters dient dazu, eine Kristallisierung des Verdickungsmittels in der Schmiermittelzusammensetzung zu hemmen. Auch wenn das Verdickungsmittel in der Schmiermittelzusammensetzung zum Teil fest wird, bleibt das fest gewordene Verdickungsmittel kaum sichtbar, und somit wird das Erscheinungsbild der Kette 11 verbessert.
• (5) Die hohe Temperatur im Kettentauchgefäß ist eine, die bewirkt, dass sich eine Schwärzung der Schmiermittelzusammensetzung entwickelt. Die Schmiermittelzusammensetzung der Ausführungsform ist von besonderem Vorteil, da sie gegenüber einer Schwärzung in einem Kettentauchgefäß, das eine solch hohe Temperatur aufweist, beständig ist. Im Falle einer Schmiermittelzusammensetzung, die nicht beständig ist gegenüber einer Schwärzung, ist es beispielsweise nötig, die Schmiermittelzusammensetzung gegen eine frisch hergestellte auszutauschen, wenn die Schmiermittelzusammensetzung in dem Kettentauchgefäß schwarz wird. Je öfter ausgetauscht wird, desto höher sind der Arbeitsaufwand und die Kosten für das Austauschen. Da die Schmiermittelzusammensetzung der Ausführungsform gegenüber einer Schwärzung beständig ist, kann jedoch die Häufigkeit, mit der die Schmiermittelzusammensetzung wegen der Schwärzung ausgetauscht wird, verringert werden.

The embodiment described above exhibits the following effects.

• (1) The lubricant composition contains a base oil, a thickener and a corrosion inhibitor, and has a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1 mass% and an aromatic content of not more than 1 mass%. With this constitution, blackening of the lubricant composition caused by sulfur, phosphorus and aromatic components can be suppressed. Therefore, a blackening of the chain 11 to which the lubricant composition is applied, are suppressed, and the chain 11 with a favorable appearance can be obtained.
• (2) The lubricant composition further contains an oily agent, which preferably comprises a compound having a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1 mass% and an aromatic content of not more than 1 mass%. With this constitution, for example, even if the oily agent is added to the lubricant composition to improve the durability of the chain, blackening of the chain may be caused 11 be suppressed. It is favorable if the oily active substance contains, for example, a fatty acid ester and / or a lanolin fatty acid alcohol ester.
• (3) The anticorrosive agent to be added to the lubricant composition preferably contains a sorbitan fatty acid ester. Among other anticorrosion agents, a sorbitan fatty acid ester may exhibit a corrosion inhibiting effect in a relatively small amount. Since a sorbitan fatty acid ester contains substantially no sulfur, phosphorus and aromatic components, blackening of the lubricant composition as caused by sulfur, phosphorus and aromatic components can be suppressed.
• (4) A sorbitan fatty acid ester of a lanolin fatty acid alcohol ester serves to inhibit crystallization of the thickening agent in the lubricant composition. Although the thickening agent in the lubricant composition becomes partially solid, the solidified thickener remains barely visible, and thus the appearance of the warp 11 improved.
• (5) The high temperature in the chain dipping vessel is one which causes a blackening of the lubricant composition to develop. The lubricant composition of the embodiment is particularly advantageous because it is resistant to blackening in a chain dipping vessel having such a high temperature. For example, in the case of a lubricant composition that is not resistant to blackening, it is necessary to replace the lubricant composition with a fresh one when the lubricant composition in the chain dipping vessel turns black. The more often exchanged, the higher the labor and the cost of replacement. However, since the lubricant composition of the embodiment is resistant to blackening, the frequency with which the lubricant composition is replaced due to blackening can be reduced.

Modified embodiments

The embodiment described above may be modified as follows.

 The sulfur content in the base oil added to the lubricant composition may exceed 100 ppm by weight. In this case, the sulfur content of the lubricant composition can be adjusted to a mass fraction of 100 ppm or less, for example, by using substantially sulfur-free compounds as thickeners and corrosion inhibitors. In other words, at least one of the proportions of sulfur, phosphorus, and aromatics in the components of the lubricant composition may exceed the levels specified for the lubricant composition.

The chain to which the lubricant composition is applied is not limited to a roller chain but may, for example, be a chain of rollers without rollers 26 . 27 be.

The lubricant composition of the above embodiment is used for the purpose of so-called pre-lubrication on the chain 11 applied. However, the lubricant composition may also be for the purpose of maintaining the chain 11 be applied when the chain 11 in use, that is, when the chain 11 is outside of the chain dipping vessel. Even in such a case, the blackening of the chain 11 caused, for example, by heat generation due to the use of the chain 11 or the heating of the environment in which it is used arises, be suppressed.

Examples

Blackening tests on base oils, thickeners, corrosion inhibitors and other ingredients were performed as described below.

(Blackening tests on base oils)

The base oils shown in Table 1 were kept at 150 ° C, and the blackness was evaluated according to the following criteria:
no blackening after 2000 hours: excellent (A);
Blackening occurred between 1000 hours (exclusive) and 2000 hours (inclusive): good (B);
Blackening occurred between 100 hours (exclusive) and 1000 hours (inclusive): not quite sufficient (C);
Blackening occurred within 100 hours (inclusive): insufficient (D).

The evaluation results are shown in Table 1. [Table 1] (Table 1) base oils classification component trade name Manufacturer Schwärzungstest mineral oil Petroleum hydrocarbon Vitrea Oil 10, 22, 32, 46, 68, 100, 150, 220, 320 Showa Shell Sekiyu KK D Valvata Oil 460, 680, 1000 Showa Shell Sekiyu KK D Shell Morlina S1 BJ Showa Shell Sekiyu KK D Super Oil M10, 12, 22, 32, 46, 68, 100, 150, 460 JX Nippon Oil & Energy Corporation D Super Oil N7, 22, 32, 46, 56, 68, 100, 150, 320, 460, 1000 JX Nippon Oil & Energy Corporation D Diana Fresia P32, 90, 150, 180, 430 Idemitsu Kosan Co., Ltd. D SUNPAR OILs 110, 115, 150, 2100, 2280 Japan Sun Oil Company, Ltd. D Highly purified mineral oil Petroleum hydrocarbon Sunpure LW70, P22, P32, P100 Japan Sun Oil Company, Ltd. B Shell Ondina Oil Showa Shell Sekiyu KK B High White 70, 350, 22S JX Nippon Oil & Energy Corporation B Daphne Oil CP, KP Idemitsu Kosan Co., Ltd. B Diana Process Oil PW32, 90, 150, 380 Idemitsu Kosan Co., Ltd. MORESCO WHITE P-40, 55, 60, 70, 80, 100, 120, 150, 200, 260, 350P MORESCO B MORESCO VIOLESS U-6, 7, 8 MORESCO B Synthetic hydrocarbon Cooligomer of ethylene and α-olefin LUCANT HC-40, 100, 600, 1100, 2000 Mitsui Chemicals, Inc. A Poly-α-olefin Durasyn 125, 126, 127, 128, 145, 146, 147, 148, 162, 164, 166, 168, 170, 174I, 180I, 180R INEOS A

 The highly purified mineral oil contains essentially no phosphorus and aromatic constituents. The sulfur content of the highly purified mineral oil is a few tens ppm or less by mass. The synthetic hydrocarbon contains essentially no sulfur, phosphorus and aromatic components.

(Blackening tests on thickeners)

The same blackening test and evaluation as described above for the base oils were performed on the thickeners shown in Table 2. The results are shown in Table 2. [Table 2] (Table 2) Thickener classification component trade name Manufacturer Schwärzungstest polymer polymethacrylate Aclube Sanyo Chemical Industries, Ltd. B polyisobutylene TETRAX JX Nippon Oil & Energy Corporation B polyethylene wax Polymerized polyethylene MITSUI Hi-WAX 100P, 200P, 400P, 800P Mitsui Chemicals, Inc. B MITSUI Hi-WAX 110P, 210P, 220P, 320P, 410P, 420P, 720P Mitsui Chemicals, Inc. B EXCEREX 10500, 20700, 40800, 30200B, 30050B, 48070B Mitsui Chemicals, Inc. B Licowax PE 130, 190, 520, 810, 820, 830, 840 Clariant B Degraded polyethylene MITSUI Hi-WAX NL100, NL200, NL500, NL800 Mitsui Chemicals, Inc. C SANWAX 171-P, 151-P, 131-P, 161-P, 161, 165-P Sanyo Chemical Industries, Ltd. C Oxidized polyethylene wax Oxidized polyethylene SANWAX LEL-250, LEL-800, LEL-400P, E-310, E-330, E-250P Sanyo Chemical Industries, Ltd. C EXCEREX 15341PA Mitsui Chemicals, Inc. C PED-121, 153, 136, 521, 821, 522, 822, 191, 192, 1101 Clariant C

(Blackening tests on anti-corrosion agents)

The same blackening test and evaluation as described above for the base oils were performed on the anticorrosion agents shown in Table 3. The results are shown in Table 3. [Table 3] (Table 3) Corrosion inhibitors

(Blackening tests on other components)

The same blackening test and evaluation as described above for the base oils were performed on the oily and high pressure actives shown in Table 4. The results are shown in Table 4. [Table 4] (Table 4) Other Ingredients classification component Name of the connection Schwärzungstest Oily substance Long-chain fatty acid oleic acid B fatty acid ester butyl stearate B Organic alcohol lauryl B Amin stearylamine C High-pressure drug Sulfur-containing olefin sulfur-containing isobutylene D sulfide dibenzyl D phosphite tributyl C phosphate tricresyl C amine phosphate C dialkyldithiophosphate Zn-dialkyldithiophosphate D Dialkalidithiocarbamat Methylene-bis (dibutyldithiocarbamate) D

 Now examples will be described.

(Examples 1 and 2)

The lubricant composition of each example was prepared by mixing the respective ingredients according to the composition shown in Table 5. In Table 5, the base oil is a highly purified mineral oil (trade name: Sunpure P100, manufactured by Japan Sun Oil Company, Ltd.), and the thickener is a polyethylene wax (MITSUI Hi-WAX 200P, manufactured by Mitsui Chemicals, Inc.). In Table 5, the anticorrosion agent is a sorbitan fatty acid ester and the oily agent is a fatty acid ester. The lubricant composition of each example was prepared so that the mass fraction of sulfur was not more than 100 ppm, the phosphorus content was not more than 1 mass%, and the aromatic content was not more than 1 mass%.

(Comparative Examples 1 and 2)

The lubricant composition of each Comparative Example was prepared by mixing the respective ingredients according to the composition shown in Table 5. As the high pressure active ingredient in Table 5, in Comparative Example 1, a sulfur-containing olefin was used, and in Comparative Example 2, a dialkyl dithiophosphate was used. The sulfur content of the lubricant composition of each comparative example was more than 100 ppm by weight. [Table 5] (Table 5) Chain Lubricant Compositions Base oil (parts by mass) Thickener (parts by mass) Corrosion inhibitor (mass parts) Oily substance (parts by mass) High pressure active ingredient (parts by mass) example 1 82 15 3 0 0 Example 2 75 15 3 7 0 Comparative Example 1 84.9 15 0 0 0.1 Comparative Example 2 84.5 15 0 0 0.5

 Each of the obtained lubricant compositions of Examples and Comparative Examples was placed in a chain dipping vessel and kept therein at 150 ° C for 1000 hours. As a result, no blackening was observed in the lubricant composition of Examples. On the other hand, in the lubricant compositions of Comparative Examples, blackening was observed within 100 hours.

Then the in 1 and 2 shown chain 11 immersed in each of the lubricant compositions of Examples and Comparative Examples. At the end of 10 minutes the chain became 11 taken out of the vessel. The chains 11 to which the lubricant compositions of Examples were applied had a good appearance without blackening. The chains 11 to which the lubricant compositions of Comparative Examples were applied had a poor appearance with conspicuous blackening.

DESCRIPTION OF REFERENCE SIGNS

• 11 ...Chain, 21 ... inner limb, 22 . 23 ... inner plate, 22a . 22b . 23a . 23b ... through hole, 24 . 25 ...Rifle, 26 . 27 ...Role, 31 ... outer limb, 32 . 33 ... outer plate, 34 . 35 ... pin

Claims (5)

 A lubricant composition for a chain comprising a base oil, a thickener and a corrosion inhibitor, the lubricant composition having a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1 mass% and an aromatic content of not more than 1 mass% ,  The lubricant composition according to claim 1, further comprising an oily agent, wherein the oily agent comprises a compound having a mass fraction of sulfur of not more than 100 ppm, a phosphorus content of not more than 1 mass% and an aromatic content of not more than 1 mass%.  A lubricant composition according to claim 2, wherein the oily agent comprises at least one selected from a fatty acid ester and a lanolin fatty acid alcohol ester.  A lubricant composition according to any one of claims 1 to 3 for use in a chain dipping vessel.  Chain to which the lubricant composition according to any one of claims 1 to 4 is applied.

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