JPS6223037B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a lubricant used for the sliding parts of rail point machines (hereinafter referred to as "points") of trains, diesel cars, freight cars, etc., and particularly for maintaining the operating function of points and cleaning services. The objective is to provide a lubricant that contributes to simplification and labor saving. Conventionally, lubricants, greases, etc. used for the sliding parts of various machines and instruments have been proposed and developed with various lubricating oils as the main ingredient and auxiliary ingredients added to and blended with it. At present, liquid lubricants such as machine oil are still used as lubricants. For example, in Japan National Railways, when cleaning points, dirt, rust, etc. stuck to the floorboards are removed using a gold brush or other means, and dirt is removed with a rag soaked in kerosene, and then the machine Oil is applied, but lubricating oil such as machine oil, which is liquid and has low adhesive strength, easily runs off and scatters from the sliding plate surface, resulting in a thin oil film and poor lubrication due to lack of oil film → galling → burning → rusting. The service life was short, and the problem was that replenishment of oil was required frequently to maintain the lubrication function. Moreover, most of the points are outdoors, and are subject to harsh environments such as being affected by the weather, temperature and temperature, and are easily covered with rainwater and dirt. Severe lubrication shortens the return of replenishment, generally once a day in areas where points are frequently used, such as once a day in main premises where the number of activations is approximately once every 1 to 3 minutes, and once every 5 to 20 minutes elsewhere. At these locations, it was necessary to apply oil about once every three days, and replenishment was required on the day after rain due to water being washed away. Therefore, the short return time for point lubrication and cleaning necessarily requires a large number of safety workers, and also significantly increases the consumption of materials such as lubricating oil, kerosene, and rags. It was hot. Moreover, this cleaning work is often carried out through the gaps between passing vehicles, making it difficult for track maintenance staff to perform their work safely.In addition to the increasing traffic volume, the current situation is such that the operation of points is being controlled remotely. There is a need for a lubricant that can extend the life of the lubricant and save resources and labor by extending the replenishment period, in order to ensure the safety of passing vehicles and workers. . In response to the above-mentioned demands, the present inventors conducted intensive research to improve the drawbacks of conventional lubricating oils and completed the present invention. That is, the present invention provides a lubricant composition containing mineral oil-based and/or synthetic-based lubricating oil as a main ingredient, wherein the lubricating oil has a kinematic viscosity of 6 to 39 centistokes (hereinafter abbreviated as CS) at 50°C and a viscosity index of 50. above, preferably below 150 and pour point -5℃
Consisting of mineral oil-based and/or synthetic lubricating oil (A) at a temperature between 37 and -60°C, and waxy substances (B) at a temperature between 37 and 60°C.
The present invention is a lubricant for a sliding plate of a track switch machine, which contains glyceride (C) of a C ₁₆ to _{C 18} saturated fatty acid as an essential component, and exhibits a thixotropic paste form at room temperature. As mentioned above, the present invention provides the specified mineral oil-based and/or synthetic lubricating oil (A), waxy substance (B) and C ₁₆ -
The gist of the present invention is a lubricant for point sliding plates, which requires _C18 saturated fatty acid glyceride (C) as an essential component and exhibits a thixotropic paste form at room temperature. The lubricant of the present invention exhibits a thixotropic paste form at room temperature as described above, but when left standing at room temperature, the lubricant of the present invention exhibits a paste form that is difficult to flow out, but when stirred, it becomes fluid and can be easily brushed. Point means that it is ready to be applied to the sliding plate. The features of the lubricant according to the present invention are that by satisfying the above-mentioned requirements, compared to conventional liquid lubricants such as machine oil, the lubricant maintains a long-term lubricating function through improved oil retention performance and is easier to clean and replenish. There is a significant improvement in That is, (1) due to thixotropy,
Point: It is less likely to stick to the sliding plate surface and leak out, and has excellent oil retention performance, so the lubrication life is long.
For example, a single application can operate for more than two weeks,
Since less lubricant is washed away due to rain, there is no need to apply oil the next day as in the past, making it less likely that the oil film will run out, and making it possible to extend the lubrication function. (2) The work efficiency of cleaning and replenishment has been improved, and it can be easily applied with a brush by simply stirring, which is easier than applying with a conventional rag, and it also prevents the risk of getting your hands caught in the points. This reduces loss of lubricant, and when cleaning, there is no need for conventional cleaning fluid (kerosene) and it can be easily wiped off with a rag, greatly reducing work time. (3) Improved oil retention performance prevents rust on the floorboard surface, and reduces surface hardening and drying due to dust adhesion. It goes without saying that (4) extending the cleaning cycle and improving cleaning work efficiency contributes to saving materials, protecting the safety of security personnel, and saving labor. The lubricating oil (A) in the present invention is the main ingredient of the lubricant according to the present invention, and penetrates into the details of the lubricated area to reduce the coefficient of friction and adjust the appearance of the product.
Kinematic viscosity at °C is 6~39C.S. Preferably 20~
36C.S., the viscosity index is 50 or more, preferably 150 or less, and the pour point is -5℃ to -
Consists of a single or mixture of mineral oil and synthetic lubricating oils at 60°C. If the kinematic viscosity is less than 6C.S. at 50℃, the flash point is low and product storage is likely to be restricted, and because of the low viscosity, (B) the amount of waxy substances used increases, making it impractical; If it is larger than .S., the viscosity is high and not only does the application process take time,
Wiping becomes difficult. If the viscosity index is less than 50, there will be a large change in the product appearance due to differences in temperature.On the other hand, products with a viscosity index of 150 can be used, but there are restrictions on raw materials, the cost will be high, and it is not practical. The following is preferable, and 70 to 130 is particularly preferable. If the pour point is -5°C, it is not preferable because the increase in viscosity, especially in winter, will significantly reduce workability. On the other hand, there are some that can be used at temperatures below -60°C, but there are few that have the desired preferred viscosity, and they tend to be subject to restrictions because they are expensive. Typical examples that meet these conditions include JISK2210 spindle oil, JISK2211 refrigeration oil, JISK2212 dynamo oil, JISK2213 turbine oil, JISK2214 machine oil, JISK2231 liquid paraffin, as well as synthetic lubricating oils such as polyolefin, diester, and polyol. There are esters, etc.
These can be used alone or as a mixture of two or more. The viscosity index varies slightly depending on the oil.
Paraffin-based neutral oil (Example (A-1) below)
refers to ) is preferably 70 to 110, particularly 90 to 105, and 50 to 90, particularly preferably 75 to 85 in the mixture (A-2) of paraffinic and naphthenic neutral oils. In addition, in synthetic neutral oil (A-3)
It is preferably 110 to 130, and preferably 100 to 120 for the mixture (A-4) of synthetic oil and paraffinic oil. Furthermore, regarding the pour point, (A-1) is around -15℃, (A-2) is around -20℃, (A-
3) is around -55℃, and (A-4) is -30℃.
A temperature around ℃ is suitable. The (B) waxy substance in the present invention is blended to convert the liquid (A) lubricating oil into a paste, and is the main component that enables formation of an oil film and maintenance of thixotropy, and has a melting point of 37 to 60. ℃ solid or semi-solid waxy materials can be used. Those with a melting point higher than 60°C are undesirable because they have a strong solidifying effect, have no thixotropic effect, and are difficult to apply and wipe off.
If it is less than that, the solidifying effect will be weak, the oil retaining ability will be lowered, and the lubrication life will be shortened, so it is not preferable. Representative waxes suitable for the present invention include vegetable waxes such as hazel wax, animal waxes such as spermaceti wax, petroleum waxes such as paraffin wax, microcrystalline wax, mineral waxes such as ozokerite, and synthetic waxes such as carbo wax. etc., and any one of these or an appropriate mixture of these can be used. Next, (C) is the third essential component in the present invention.
As the glyceride of C ₁₆ to _{C 18} saturated fatty acids, it is possible to use either monoglyceride monoglyceride or a mixture of this monoglyceride and diglyceride and/or triglyceride, which is well known as a polyhydric alcohol-based nonionic surfactant. Stearic acid monoglyceride (usually contains diglyceride)
is suitable. These glycerides are insoluble in water and serve as oil-soluble emulsifiers to prevent separation of both components (A) and (B) in the present invention, and (B)
In addition to being the main component that makes the product thixotropic, it is also an indispensable compounding agent that makes the product of the present invention easier to wipe off.As a result, the product of the present invention has significantly improved oil retention performance and retains its lubricating function for a long period of time. Not only that, but it can be applied with a brush simply by stirring, and it can be easily wiped off with a rag without the need for cleaning fluid, which greatly reduces the labor involved in cleaning. The present invention comprises the above-mentioned (A) lubricating oil, (B) waxy substance and
(C) The desired product can be obtained by appropriately melting and mixing saturated fatty acid glycerides. auxiliary ingredients of
(D) can be appropriately mixed, and may be preferable in some cases. The additives used as these auxiliary components (D) are illustrated below. In other words, there are various compounds as antioxidants, including (a) phenol type;
(b) amine type, (c) sulfur-containing special type, and (d) organic phosphite type, etc. For example, (a) is 2,
6-di-tert-butyl-4-methylphenol (DBPC), 4,4'methylenebis(2,6-
Tertiarybutylphenol. ), (b) is an aniline derivative such as phenyl-α-naphthylamine or phenyl-β-naphthylamine, (C) is a sulfur compound such as dibenzyl disulfide, and (d) is tricresyl. Although any phosphorus compounds such as phosphate-based compounds can be used, phenol-based compounds are preferred. Rust inhibitors include carboxylic acid, basic nitrogen compound, sulfonic acid, ester, organic sulfur, and phosphorus compounds, but sorbitan monooleate, an ester inhibitor, is most suitable. Antistatic agents include alkyl phosphates, amine derivatives, polyoxyethylenes, polyhydric alcohols, etc., but phosphoric diesters can also be used to have the effect of an oiliness imparting agent. As extreme pressure agents, organic sulfide compounds, organic chlorine phosphorus compounds such as tricresyl phosphate, sulfurized fats and oils, and naphthenic acid metal salts are used, and as low-temperature property modifiers, (B) wax Paraffin-based polymers that can prevent the growth of crystals, such as paraffin wax and naphthalene condensates, phenoltetra wax condensates, or microcrystalline waxes, are effective. The auxiliary components (D) in the present invention can be added as desired, but if some of these components are already commercially available in (A) lubricating oil, the amount added may be reduced. Of course, it is not necessary to add it. The lubricant of the present invention, which is in the form of a thixotropic paste at room temperature, is prepared by adjusting the mixing ratio of (B) waxy substances, (C) fatty acid glycerides, and (D) auxiliary components to (A) lubricating oil according to the properties of each raw material. However, a lubricant exhibiting the desired thixotropy is obtained at a ratio of approximately (A) to (B) + (C) + (D) of 70 to 90/30 to 10, and (B ), (C) and (D) are preferably (3-20), (3-10) and (0-7)% by weight, respectively. EXAMPLES Hereinafter, the present invention will be described with reference to Examples and comparative examples, but these are merely illustrative and do not limit the present invention. In the present invention, there is no particular restriction on the method of blending each component, and the product of the present invention can be obtained by heating and melting each raw material using a known mixing device. Display with others. The paraffinic neutral oil used has a viscosity of 50℃.
22C.S, viscosity index 105, pour point -15℃, naphthenic neutral oil has a viscosity of 21.6CS at 50℃, viscosity index 40.5,
At pour point -27.5℃, that of synthetic oil is 20.9CS, 117
and −55°C.

【table】

【table】

[Table] As is clear from the above results, the point floor lubricant according to the present invention has a higher number of days of use, that is, cleaning regression, than conventional commercially available products and lubricants that do not contain stearic acid monoglyceride, which is component (C). Significant improvements were observed in stretching, reduction in the amount of lubricant applied, and reduction in the number of wipings and cleaning time required for cleaning. In addition to saving resources and lowering costs, the time required for cleaning and coating was shortened, and the number of times of replenishment was reduced, resulting in labor savings and a significant reduction in human danger to workers.

Claims (1)

[Claims] 1. In a lubricant composition based on mineral oil and/or synthetic lubricating oil, the lubricating oil has a kinematic viscosity of 6 to 39 centistokes at 50°C and a viscosity index of 50.
or more, preferably 150 or less and pour point -
Consisting of a mineral oil-based and/or synthetic lubricating oil (A) with a temperature of 5°C to -60°C, and a waxy substance (B) with a melting point of 37 to 60°C and a glyceride of a saturated fatty acid of _C16 to _C18 .
A lubricant for a sliding plate of a rail switch machine, which contains (C) as an essential component and exhibits a thixotropic paste form at room temperature.