JPH11343493A - Aerosol lubricant composition for chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lubricant for a chain capable of excellently penetrating into gaps between pins and bushes, improving lubricating performances and preventing seizing and abrasion without troublesome routes such as removal of chain, decomposition, heating, etc., in a lubricant for a chain. SOLUTION: This aerosol lubricant composition for chain comprises 100 pts.wt. of a mineral oil or synthetic oil-based lubricant base oil, 5-10 pts.wt. of a petroleum resin, 10-20 pts.wt. of a polyolefin, 2-4 pts.wt. of a zinc dialkyldithiophosphate, 40-60 pts.wt. of an organic solvent and a propellant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant for improving the lubricating performance of a metal chain used in a transport machine such as an automobile or a motorcycle, and more particularly to a lubricant suitable for lubricating a drive chain of a forklift or a motorcycle. Agent composition.

[0002]

2. Description of the Related Art Chain-based power transmission has a high power transmission efficiency and a large degree of freedom with respect to speed and load fluctuation.
Since it can be used from low to high temperatures and is economical, it is widely used in general industrial machinery, automobile-related and the like.

[0003] The chain requires the use of a lubricant since it repeats violent reciprocating motion and rotational motion as it is driven.
If a lubricant is not used, the lubrication between the pin and bush, between the roller and bush, and between the inner and outer plates, etc., will deteriorate, causing them to wear, and furthermore, the chain will stretch, resulting in a reduction in power transmission efficiency and eventually chain damage. May be connected.

[0004] This indicates that the performance of the lubricant governs the performance or durability of the chain.
The use of a lubricant is essential. However, chain lubricants, unlike ordinary rust-preventive lubricants, require special requirements for use in chains.

One of the requirements is that in a chain, for example, the clearance between the pin and the bush is 0.05 mm or less, and the injection and supply can be sufficiently performed even in such a narrow space. Lubricant must be injected after the chain is assembled for reasons of the chain manufacturing process. In addition, it is often necessary to perform injection during maintenance, and it is necessary that injection can be easily performed at that time.

A second requirement is that the lubricant once injected does not easily flow out. The chain may be vibrated or centrifuged when driven, and the lubricant may scatter, fall off, or flow out. In addition, there is a possibility that the toner may fall off due to external factors such as dirt such as water and oil and rainwater. Chain grease must retain lubricant even in such cases. In order to respond to such requirements, it has been proposed to use a special structure for the pin and bush of the chain to physically confine the chain grease inside, but there is no versatility and the manufacturing cost is low. High and uncommon.

Further, when a lubricant is injected and supplied as a product at the time of manufacturing a chain, the chain can be immersed in a lubricant and injected into a lubricating portion such as between a pin and a bush by vacuum impregnation. Without removing the chain where it is used, such as the drive
When applying a lubricant, the above method cannot be adopted.

The chain is used at high speed and high load in a dusty atmosphere like a chain for a motorcycle.
The conditions of use are severe, and with low-consistency grease, the centrifugal force associated with high-speed operation causes grease to scatter early from the gaps in the bearing device, and the resulting contact between metals causes false adhesion of the bush and pin. In addition, the chain may be prevented from being used at an early stage by preventing smooth bending of the chain.

[0009]

It is preferable that a protective part is attached to a place where a chain is used, such as a driving part of an automobile. However, a part where the chain is barely used may fall off due to rainwater or the like. Grease is denatured by light and loses lubricity, and dust and dust adhere to it and mix with the lubricant to deteriorate lubrication performance.

[0010] For this reason, the chain supplied and manufactured has required operations such as applying a lubricant as daily maintenance. However, the clearance of the chain is very small and it is difficult to press-fit the lubricant.

A conventional chain lubricant composition is disclosed in, for example, JP-A-53-31706. The composition has an ASTM WW consistency at 50 ° C. of 50-200.
And a consistency at 80 ° C of 350 or more, specifically, 10 to 30 parts by weight of lubricating oil and / or lubricating grease, 10 to 50 parts by weight of solid paraffin having a melting point of 60 ° C or more. And average molecular weight 30
It is composed of 3 to 20 parts by weight of polyisobutylene of 000 or less. Once the lubricant is permeated into the chain, it has good non-outflow properties, but must be heated during supply, which complicates the lubricant application operation.

In general, a rust preventive lubricant having good permeability generally has good fluidity and easily penetrates into the chain clearance, so that it easily flows out at the time of use. In addition, the lubricant is applied only to the surface for maintenance. There were many things that could not penetrate inside.

[0013]

Accordingly, as a result of intensive studies as chain lubricants having the above-mentioned disadvantages improved, 100 parts by weight of mineral or synthetic oil-based lubricating base oil, petroleum resin
10 parts by weight, polyolefin 10-20 parts by weight, zinc dialkyldithiophosphate 2-4 parts by weight, organic solvent 40-6
An aerosol lubricant composition for chain lubrication comprising 0 parts by weight and a propellant has been obtained. In a preferred embodiment of the aerosol lubricant composition of the present invention, more excellent one can be obtained by selecting isohexane as an organic solvent and further selecting polybutene as a polyolefin.

As the lubricating base oil used in the present composition, known lubricating oils such as mineral lubricating oils and polyolefin-based synthetic lubricating oils can be used alone or in combination.

The mineral base oil is obtained from a raw material such as, for example, a paraffinic hydrocarbon oil or a naphthenic hydrocarbon oil by a method such as de-recognition, solvent refining, dewaxing, hydrorefining, and hydrocracking. .

The polyolefin-based synthetic lubricating oil is a synthetic lubricant composed of an oligomer of olefin, preferably α
-Olefin oligomers, ethylene-α-olefin oligomers and the like. This olefin has 2 carbon atoms
To 20 are desirable, and specific examples thereof include 1-decene trimer to hexamer, ethylene-α-olefin copolymer and the like. This synthetic oil may be a mixture of various polyolefin oligomer synthetic oils.

The petroleum resins used in the present composition are classified into aliphatic, aromatic and copolymer petroleum resins for convenience depending on the monomer source and molecular structure. Aliphatic petroleum resins are obtained by polymerizing chain aliphatic unsaturated hydrocarbons of the C5 fraction, and the main components of the polymerization are isoprene, piperylene, pentene, methylbutene and the like. The aromatic petroleum resin is obtained by polymerizing aromatic unsaturated hydrocarbons of C9 to 11 fractions such as methylstyrenes and indenes. The alicyclic petroleum resin is obtained by polymerizing dicyclopentadiene, and the copolymerized petroleum resin is obtained by copolymerizing these fractions at various ratios. These petroleum resins are obtained by polymerizing the above fraction by a radical polymerization reaction, a cationic polymerization reaction or an anionic polymerization reaction. These petroleum resins are Escolets (manufactured by Tonen Petrochemical), Heylets (manufactured by Mitsui Petrochemical), Tackiroll (manufactured by Sumitomo Chemical), Quinton (manufactured by Nippon Zeon) as aliphatics, and petrozion (Mitsui as an aromatics). Chemical Co., Ltd.), Neopolymer (Nisseki Resin Chemical Co., Ltd.), High Resin (Toho Petrochemical Co., Ltd.) as a copolymer, and Alcon (Arakawa Chemical Co., Ltd.) as an alicyclic group are available.

The petroleum resin to be added to the lubricant composition of the present invention may be any of aliphatic type, aromatic type, alicyclic type and copolymer type, but is preferably aliphatic type. Generally, the solubility of petroleum resins in mineral oil and synthetic oil is good.
It is excellent in chemical resistance and heat stability to general acids and alkalis, and has almost no acid value, so there is no fear of corroding equipment and the like. The average molecular weight is usually 400 to
It is about 2,000, and has excellent shearing properties, and does not cause a decrease in viscosity during use when added to lubricating oil or hydraulic oil.

The addition ratio of petroleum resin to lubricating base oil is
It is 5 to 10 parts by weight based on 100 parts by weight of the base oil. If the addition ratio of petroleum resin is small, detachment from the chain is likely to occur depending on the use environment when applied to the chain, and if it is more than 10 parts by weight, it will not easily penetrate into the details of the chain.

The polyolefin added to the present invention is a substance which has been known for adjusting the viscosity index of a lubricating base oil. The polyolefin has a low solubility in a high molecular weight lubricating base oil and is suspended in a colloidal form, or a part of the polyolefin dissolved in the form of a coil is coiled to reduce the apparent size of the molecule. From this, the viscosity index (thixotropic property) is improved by adding a small amount of polyolefin to the lubricating base oil. However, in the present application, by blending a specific amount of polyolefin into a system in which a specific amount of a lubricating base oil and an organic solvent are mixed, the difference in solubility of the polyolefin between the lubricating base oil and the organic solvent and the degree of change in the viscosity index at that time are used for chains. It becomes an excellent lubricant. That is, it is suitable for satisfying the above-mentioned effects for use in the chain.

Examples of the polyolefin include polyethylene, polypropylene, polyisobutylene, polybutene, polymethylpentene and polypentene, and the average molecular weight is preferably about 10,000 to 20,000. Particularly in the present invention, polybutene is preferred.

It is necessary to add zinc dialkyldithiophosphate to the composition. It is known that this component is usually added to a lubricant composition as an antiwear agent and an extreme pressure agent, and it is conceivable to improve lubrication performance. When the aerosol lubricant composition is applied for use as a lubricant, it has good permeability to details, and cannot be expected to have an effect of reducing leakage from a penetration portion during use.

As the zinc dialkyldithiophosphate to be added to the present invention, conventionally known zinc dialkyldithiophosphates can be used, but an isopropyl group is particularly preferable as the alkyl group.

The addition amount of zinc dialkyldithiophosphate is preferably 2 to 4 parts by weight based on 100 parts by weight of the lubricating base oil.
If the amount is less than 2 parts by weight or more than 4 parts by weight, the permeability to details is poor and the lubricating performance is reduced.

In the present invention, the above-mentioned lubricant composition is used in the form of an aerosol. Conventional propellants for aerosols can be used. The composition of the present invention contains an organic solvent and is used after evaporating the organic solvent. However, the composition azeotropizes with the aerosol propellant and evaporates quickly. As described above, the chain must penetrate the small clearance, but can penetrate between the pin and the bush by the interaction between the injection pressure of the propellant and the excellent permeability of the composition of the present invention.

Further, an additive for improving the anti-wear function can be added to the present lubricant composition, if necessary. As the additive, an anti-frictional agent and an extreme pressure additive which are added to ordinary lubricating oils for the same purpose can be applied. Specifically, sulfurized fats and oils, dibenzyl sulfide, organic polysulfide, polyphenylene polysulfide, thiocarbonate, phosphonate, phosphite, metal naphthenate, fatty acid salt, thiocarbamate, dihydrated molybdenum, zinc oxide, graphite , Polytetratrifluoroethylene, and the like. However, the use of these additives does not improve the permeability to extremely small details, and the lubricating performance between the pins and bushes of the chain does not change much.

[0027]

The aerosol lubricant composition of the present invention is obtained by mixing a petroleum resin, a polyolefin and zinc dialkylene dithiophosphate in a specific ratio with a base oil and adding an organic solvent and a propellant to form an aerosol lubricant composition. In such a case, the lubricant having improved permeability due to dissolution in the organic solvent easily penetrates into the details of the lubricated portion. In addition, the lubricating performance lasts for a long time without leaking during use even though the permeability is good at the time of aerosol spraying, that is, at the time of application.

This action must be at a specific ratio according to the present invention, and other compounding ratios and compounds do not exhibit excellent permeability. On the contrary, the infiltrated lubricating composition tends to leak during use, resulting in markedly poor lubricating performance.

[0029]

The aerosol lubricant composition of the present invention is suitable as a lubricant for a chain, and removes the chain and does not require a troublesome process such as disassembly or heating. It penetrates well to improve lubrication performance and does not cause seizure or wear. Therefore, the chain does not stretch or break.

Further, even though the lubricant penetrates well into the gap between the pin and the bush, even when the chain is used under a high load and a high rotation speed, the lubricant does not scatter or desorb, and the lubricating performance is improved. Does not decrease.

The lubricant composition is stable without change even when used in direct sunlight, in a high-temperature atmosphere, or in a place where there is a lot of dust or rainwater.

Even when the present lubricant composition adheres to an undesired portion or when it is excessively applied to a chain, the present composition has a low viscosity and can be easily wiped off. Because there is no dust, it is less likely that dirt will adhere and become dirty.

Furthermore, even at low temperatures, the performance of the chain can be maintained without impairing the flexibility and followability of the coating film. Due to the above performance, it is particularly useful as a lubricant for industrial chains such as forklifts, motorcycles, bicycles and agricultural equipment. Can be used.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION

EXAMPLES Preparation of aerosol lubricants, Examples 1 to 14,
Comparative Examples 1 to 12 The formulations shown in Table 1 were mixed in the amounts as described, and 150 mL of each component and 350 mL of liquefied propane as a propellant were used to fill an aerosol can. Also,
As shown in Table 2, the composition of the comparative example was mixed to prepare a composition as a comparative example, and filled in an aerosol can in the same manner as described above.

[0035]

[Table 1]

[0036]

[Table 2]

Lubricity test using chain Chain # 50 25 links, rotation speed 2300 rpm,
Sprocket 15T × 43T, tensile load 150kg ×
A test on the lubricity of the chain was performed under the conditions according to No. 2. The method of application to the chain is to degrease, wash and dry the above chain,
The chain was hung and the compositions prepared from four directions were sprayed evenly and allowed to stand still at 25 ° C. for 10 minutes. The chain was set and rotated, and the length of the chain was measured periodically. In addition, 72 hours, 96 hours, 12 hours
After the elapse of 0 hours, the elongation of the chain is measured, and the lubricating composition is sprayed by spraying a further prepared composition in a state where the chain is set without performing degreasing or washing, and the lubricating composition is permeated, and left as it is for 10 minutes to rotate. Continued. Table 3 shows the results. The experiment was stopped when the elongation exceeded 1%.

[0038]

[Table 3]

[0039]

[Brief description of the drawings]

FIG. 1 is a graph showing Examples 1, 2, and 3 as time on the X axis and elongation of the chain on the Y axis.

FIG. 2 is a graph in which the X axis represents time and the Y axis represents chain elongation for Examples 4, 5, and 6;

FIG. 3 is a graph showing Examples 7, 8, and 9 as time on the X-axis and elongation of the chain on the Y-axis.

FIG. 4 is a graph in which the X axis represents time and the Y axis represents chain elongation in Examples 10, 11, and 12.

FIG. 5 is a graph in which the X-axis represents time and the Y-axis represents chain elongation in Examples 13 and 14.

FIG. 6 is a graph in which the X axis represents time and the Y axis represents chain elongation in Comparative Examples 1, 2, and 3;

FIG. 7 is a graph in which the X axis represents time and the Y axis represents chain elongation for Comparative Examples 4, 5, and 6;

FIG. 8 is a graph in which the X axis represents time and the Y axis represents chain elongation for Comparative Examples 7, 8, and 9;

FIG. 9 is a graph in which the X axis represents time and the Y axis represents chain elongation for Comparative Examples 10, 11, and 12;

Claims (3)

[Claims] 1. 100 parts by weight of a mineral or synthetic lubricating base oil, 5 to 10 parts by weight of a petroleum resin, 10 to 2 parts of a polyolefin.
0 parts by weight, 2 to 4 parts by weight of zinc dialkyldithiophosphate,
An aerosol lubricant composition for chains comprising 40 to 60 parts by weight of an organic solvent and a propellant. 2. The aerosol lubricant composition according to claim 1, wherein the organic solvent is isohexane. 3. The aerosol lubricant composition for a chain according to claim 1, wherein said polyolefin is polybutene.