JP2018177863A - Semi-solid lubricant composition and wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a semi-solid lubricant composition and a wire using the same, wherein the semisolid lubricant composition can improve heat resistance, lubricity and water resistance as compared with a conventional semi-solid lubricant composition.SOLUTION: The semi-solid lubricant composition according to the present invention is characterized by having petrolatum containing grease. The semi-solid lubricant composition can improve heat resistance by applying the composition to an inside and an outside of the wire composed of a metal stranded wire, such as a wire rope and a wire/cable, and making the composition hard to sag even under a high temperature environment. In addition, the semi-solid lubricant composition of the present invention can improve the lubricity and the water resistance of the wire and also can extend a life of the wire.SELECTED DRAWING: None

Description

  The present invention relates to a semisolid lubricating composition and a wire using the same.

  A semi-solid lubricating and anticorrosion protective agent is infiltrated and applied to the inside and the outside of a wire composed of metal twisted wires such as a wire rope, a wire / cable, etc. The anticorrosive agent is contained in the lubricating and antirust protective agent to improve the antirust property.

  For example, the invention described in Patent Document 1 below discloses a semi-solid composition having a high dropping point as compared with the prior art. The semi-solid composition described in Patent Document 1 is a wax obtained by mixing (A) a base oil, (B) an amide, (C) an ester, and (D) an oil and fat, and these are respectively mixed at a predetermined blending ratio Let me raise the drop point.

JP, 2014-9317, A

  However, conventionally, the heat resistance and lubricity of semisolid compositions applied to wire ropes and the like have not been considered.

  For example, in the invention described in Patent Document 1, the dropping point can be improved. However, the heat resistance to the temperature change in a high temperature environment and the lubricity are not particularly considered. Also, conventionally, no consideration is given to the water resistance of semi-solid compositions. As shown in the experiment described later, the results of low heat resistance (viscosity characteristics), lubricity and water resistance of the wax were all obtained.

  As described above, in the conventional semi-solid composition, good heat resistance, lubricity and water resistance can not be obtained, and the life of the wire can not be appropriately extended.

  Accordingly, the present invention has been made in view of the above problems, and provides a semi-solid lubricating composition capable of improving heat resistance, lubricity and water resistance as compared to the prior art, and a wire using the same. The purpose is

  The semisolid lubricating composition of the present invention is characterized in that the petrolatum contains a grease.

  In the present invention, the mixing ratio of petrolatum and grease is preferably in the range of petrolatum: grease = 95: 5 to 50:50 (weight ratio).

In the present invention, the viscosity of the semisolid lubricating composition at a shear rate of 10S ⁻¹ at 120 ° C. with respect to the viscosity (A) of the semisolid lubricating composition at a shear rate of 10S ⁻¹ at 70 ° C. The change rate of B) [{(A−B) / A)} × 100 (%)] is preferably 90 or less.

  In the present invention, the dropping point of the semi-solid lubricating composition is preferably 80 ° C. or more and 150 ° C. or less.

  In the present invention, the fusion load in the high-speed four-ball test of the semi-solid lubricating composition is preferably 1960 N or more.

  In the present invention, the reduction amount of the semi-solid lubricating composition in the water resistance test using the ultrasonic cleaner is preferably 19% or less.

  In the present invention, the thickener contained in the grease includes lithium soap, calcium soap, sodium soap, aluminum soap, lithium complex soap, calcium complex soap, aluminum complex soap, urea compound, organic bentonite, polytetrafluoroethylene, It is preferable to be selected from at least one of silica gel and sodium terephthalamate.

  In the present invention, the semisolid lubricating composition is preferably used by applying to a wire that is configured to have a metal stranded wire.

  The present invention is a wire comprising a metal stranded wire, wherein the above-mentioned semisolid lubricating composition is applied to the wire.

  The semisolid lubricating composition of the present invention can improve heat resistance, lubricity and water resistance as compared with the prior art.

  By applying the semi-solid lubricating composition of the present invention to the inside and the outside of a wire composed of metal strands, such as wire ropes, wires and cables, the semi-solid lubricating composition is less likely to sag even in a high temperature environment. Heat resistance can be improved. Also, the lubricity and water resistance of the wire can be improved, and the life of the wire can be extended.

It is a test result which evaluates the heat resistance of the semi-solid-like lubricating composition of a present Example, and the wax of a comparative example and a prior art example. It is a test result which evaluates the temperature-viscosity characteristic of the semisolid-like lubricating composition of a present Example, and the wax of a comparative example and a prior art example. It is a test result which evaluates the lubricity of the semisolid-like lubricating composition of a present Example, and the wax of a comparative example and a prior art example. It is a test result which evaluates the water resistance of the semi-solid-like lubricating composition of a present Example, and the wax of a comparative example and a prior art example.

  Hereinafter, an embodiment of the present invention (hereinafter, abbreviated as “embodiment”) will be described in detail. The present invention is not limited to the following embodiments, and can be variously modified and implemented within the scope of the invention.

  The semi-solid lubricating composition in the present embodiment is characterized in that the petrolatum contains a grease.

  "Petroleum" is a semisolid mixture obtained by mixing heavy fractions of lubricating oil with wax obtained from petroleum, and is mainly a purified mixture of methane-based semisolid carbohydrates. Petrolatum is not particularly limited. For example, about 40 to 60% of mineral oil, about 30 to 50% of petroleum wax, about 0 to 10% of synthetic wax, and 1 to 10% of polymer modifiers It contains about 10%.

Petrolatum has a melting point (based on JIS K 2235) of about 70 ° C., and a consistency (based on JIS K 2235) of about 80 to 120. Moreover, the kinematic viscosity (based on JIS K 2283) at 100 ° C. is about 15 to 40 mm ² / s.

  Greases include base oils and thickeners. The base oil is not particularly limited, but is selected from at least one of mineral oil, synthetic hydrocarbon oil, diester oil, polyol ester oil, ether oil, glycol oil, silicone oil, and fluorine oil. Is preferred.

  Moreover, as a thickener, lithium soap, calcium soap, sodium soap, aluminum soap, lithium compound soap, calcium compound soap, aluminum compound soap, urea compound, organic bentonite, polytetrafluoroethylene, silica gel, sodium terephthalamate It is preferable to be selected from at least any one of the above. As the thickening agent, lithium stearate and / or lithium 12-hydroxystearate are preferable from the viewpoints of lubricity and corrosion resistance, calcium complex soap, or shear stability.

  The base oil and the thickener can be separated by a solvent extraction method or a Soxhlet extraction method, which makes it possible to analyze grease components.

  In the present embodiment, a wax may be further included. As the petroleum wax, paraffin wax, microcrystalline wax and the like can be selected. Further, as the synthetic wax, hydrocarbon wax obtained by the Fischer-Tropsch method or ethylene polymerization method can be selected.

  In addition, an antioxidant, a rust inhibitor, a metal corrosion inhibitor, an oil agent, an antiwear agent, an extreme pressure agent, a solid lubricant and the like can be added to the grease, as necessary. The content of these additives is within the range of about 0.01 to 30 parts by weight with respect to the grease. The antioxidant can be selected from hindered phenol, alkylated diphenylamine, phenyl-α-naphthylamine and the like. The rust inhibitor may be selected from carboxylic acids such as stearic acid, dicarboxylic acids, metal soaps, carboxylic acid amine salts, metal salts of heavy sulfonic acids, and carboxylic acid partial esters of polyhydric alcohols. The metal corrosion inhibitor can be selected from benzotriazole or benzimidazole. The oil agent may be selected from amines such as laurylamine, higher alcohols such as myristyl alcohol, higher fatty acids such as palmitic acid, fatty acid esters such as methyl stearate, or amides such as oleylamide it can. The antiwear agent can be selected from zinc-based, sulfur-based, phosphorus-based, amine-based or ester-based. The extreme pressure agent may be selected from zinc dialkyl dithiophosphates, molybdenum dialkyl dithiophosphates, sulfurized olefins, sulfurized oils and fats, methyl trichlorostearate, chlorinated naphthalene, benzyl iodide, fluoroalkylpolysiloxane, or lead naphthenate, etc. Can. The solid lubricant can be selected from graphite, graphite fluoride, polytetrafluoroethylene, melamine cyanurate, molybdenum disulfide, antimony sulfide and the like.

  The semi-solid lubricating composition according to the present embodiment is constituted by making the petrolatum as a main component additionally contain a grease. Specifically, the mixing ratio of petrolatum and grease is preferably in the range of petrolatum: grease = 95: 5 to 50:50 (weight ratio). More preferably, it is 90:10 to 60:40 (weight ratio), still more preferably 85:15 to 65:35 (weight ratio). Thereby, each characteristic (heat resistance, lubricity, and water resistance) of the semisolid lubricating composition can be appropriately improved.

  By the way, in the past, petrolatum was applied to the inside and the outside of the wire rope. Petrolatum is excellent in corrosion resistance. Therefore, the corrosion resistance of the wire rope can be improved by applying petrolatum. However, as described above, petrolatum has a low melting point, and fluidization may occur under high temperature environments. Further, as the semi-solid composition applied to the wire rope, in order to effectively extend the life of the wire rope, it is preferable that not only heat resistance but also lubricity and water resistance are good.

  Therefore, the present inventors mixed grease as an additive into petrolatum as a main component. As a result, a semi-solid lubricating composition capable of effectively improving the heat resistance, the lubricity and the water resistance as compared to petrolatum (wax) has been obtained.

In the present embodiment, the semisolid lubricating composition having a shear rate of 10S ⁻¹ at 120 ° C. and a viscosity (A) of the semisolid lubricating composition at a shear rate of 10S ⁻¹ at 70 ° C. The change rate of the viscosity (B) [{(A−B) / A)} × 100 (%)] is preferably 90 or less. More preferably, it is 87% or less, more preferably 85% or less.

  As described above, in the present embodiment, the change in viscosity can be suppressed to be small with respect to the change in temperature under a high temperature environment. For this reason, even if the wire rope to which the semisolid lubricating composition of the present embodiment is applied is exposed to a high temperature environment, it is possible to suppress the problem of the semisolid lubricating composition becoming fluidized and dropping.

  Moreover, in the present embodiment, it is possible to adjust the dropping point of the semisolid lubricating composition to 80 ° C. or more and 150 ° C. or less. Thus, in the present embodiment, the dropping point of the semisolid lubricating composition can be made higher than the melting point of petrolatum. Also, if the dropping point becomes too high, the moderate fluidity of the semisolid lubricating composition is lost, and the semisolid lubricating composition can not be properly infiltrated into the wire rope. For this reason, the upper limit of the dropping point was set to 150 ° C. The dropping point increases as the mixing ratio of the grease in the semisolid lubricating composition increases. Therefore, as a mixing ratio of grease, it is preferable to adjust with the above-mentioned weight ratio.

  As described above, in the present embodiment, the heat resistance of the semisolid lubricating composition was evaluated based on the viscosity change with respect to the temperature change in the high temperature environment and the dropping point. The dropping point is also disclosed in the invention described in Patent Document 1. However, the viscosity change is an effect obtained by mixing appropriate grease with petrolatum as in the present embodiment, that is, an effect unique to the present embodiment. And, as in the present embodiment, the viscosity change to the temperature change under the high temperature environment is small, and further, it has a high dropping point compared to the petrolatum (without containing grease) as the comparative example and the conventional example. The heat resistance of the semisolid lubricating composition can be effectively improved.

  Further, the semisolid lubricating composition according to the present embodiment has a fusion load in the high speed four-ball test of at least 1960 N or more. Further, in the present embodiment, the fusion load in the high-speed four-ball test can be 2450 N or more. According to the present embodiment, the fusion load is higher than that of petrolatum (without containing grease) as the comparative example and the conventional example. The fusion load is an index for evaluating the lubricity, and the higher the value, the better the load resistance and the superior lubricity. Therefore, the semisolid lubricating composition according to the present embodiment has superior lubricity compared to the prior art.

  Further, in the present embodiment, the reduction amount in the water resistance test using the ultrasonic cleaning machine for the semi-solid lubricating composition can be suppressed to 19% or less. Further, in the present embodiment, the reduction amount can be preferably 16% or less, more preferably 15% or less, and still more preferably 13% or less. Specific conditions of the water resistance test will be described in detail later. According to the present embodiment, the reduction amount by the water resistance test can be made smaller compared to petrolatum (without containing grease) as the comparative example and the conventional example, and therefore, the water resistance is superior to that of the conventional example. ing.

  As described above, the heat resistance, the lubricity and the water resistance of the wire rope are improved by applying the semisolid lubricating composition excellent in the heat resistance, the lubricity and the water resistance as well as the rust resistance to the wire rope. It can be done. The semisolid lubricating composition of the present embodiment has appropriate fluidity, so that the semisolid lubricating composition can be appropriately distributed to the inside and the outside of the wire rope. By the above, it is possible to improve the life of the wire rope as compared with the prior art.

  The wire rope to which the semisolid lubricating composition of the present embodiment is applied is not particularly limited in application, such as for elevators and cranes. In addition, the wire rope has a core net and a plurality of strands (a large number of wire strands twisted together), and each strand is twisted around the core net, or the core There is no mesh, and the structure is not particularly limited, such as a structure in which a plurality of strands are twisted together.

  In addition, the semi-solid lubricating composition of the present embodiment is not limited to application to a wire rope, and a wire used for electronic devices etc. as long as it is a wire configured to have a metal stranded wire.・ The application is not particularly limited, such as cables and transmission lines.

  Hereinafter, the present invention will be described in detail by examples implemented to clarify the effects of the present invention. The present invention is not limited at all by the following examples.

  The following Examples 1 to 6 and Comparative Examples 1 to 3 and Conventional Examples 1 to 2 were prepared. The raw materials used are as follows.

Example 1
Petrolatum A: 85%
(Consistency (25 ° C): 90 Dynamic viscosity (100 ° C): 25 mm / s)
Grease: 5%
(Calcium complex soap worked consistency (25 ° C): 280)
Synthetic wax: 10%
(Viscosity (190 ° C) 1200 mPa · s)

Example 2
Petrolatum A: 80%
(Consistency (25 ° C): 90 Dynamic viscosity (100 ° C): 25 mm / s)
Grease: 20%
(Calcium complex soap worked consistency (25 ° C): 280)

[Example 3]
Petrolatum A: 75%
(Consistency (25 ° C): 90 Dynamic viscosity (100 ° C): 25 mm / s)
Grease: 20%
(Calcium complex soap worked consistency (25 ° C): 280)
Synthetic wax: 5%
(Viscosity (190 ° C) 1200 mPa · s)

Example 4
Petrolatum A: 65%
(Consistency (25 ° C): 90 Dynamic viscosity (100 ° C): 25 mm / s)
Grease: 30%
(Calcium complex soap worked consistency (25 ° C): 280)
Synthetic wax: 5%
(Viscosity (190 ° C) 1200 mPa · s)

[Example 5]
Petrolatum A: 45%
(Consistency (25 ° C): 90 Dynamic viscosity (100 ° C): 25 mm / s)
Grease: 45%
(Lithium soap mixture consistency (25 ° C): 285)
Oil wax: 10%
(Melting point: 58.9 ° C)

[Example 6]
Petrolatum B: 50%
(Consistency (25 ° C): 115 kinematic viscosity (100 ° C): 21 mm / s)
Grease: 50%
(Lithium soap mixture consistency (25 ° C): 285)

Comparative Example 1
Petrolatum A: 97%
(Consistency (25 ° C): 90 Dynamic viscosity (100 ° C): 25 mm / s)
Grease: 3%
(Calcium complex soap worked consistency (25 ° C): 280)

Comparative Example 2
Petrolatum A: 90%
(Consistency (25 ° C): 90 Dynamic viscosity (100 ° C): 25 mm / s)
Synthetic wax: 10%
(Viscosity (190 ° C) 1200 mPa · s)

Comparative Example 3
Petrolatum B: 85%
(Consistency (25 ° C): 115 kinematic viscosity (100 ° C): 21 mm / s)
Petroleum wax: 15%
Melting point: 58.9 ° C

Conventional Example 1
Petrolatum calcium based rust inhibitor

[Conventional example 2]
Petrolatum Barium-based rust inhibitor

[Testing method etc.]
The consistency of petrolatum was measured according to JIS K 2235. The kinematic viscosity of petrolatum was measured according to JIS K 2283. The consistency of the grease was measured according to JIS K 2220.

  In Table 1 below, test results of Examples 1 to 6, Comparative Examples 1 to 3 and Conventional Examples 1 and 2 are shown. The various tests will be described.

[Heat resistance evaluation Drop point test]
Based on JIS K 2220, the drop point test was performed on the above-mentioned Examples 1 to 6 and Comparative Examples 1 to 3 and Conventional Examples 1 and 2. The experimental results are shown in FIG.

  As shown in FIG. 1, in this example, it was found that the dropping point was in the range of 80 ° C. to 150 ° C. On the other hand, in the comparative example and the conventional example, the dropping point was lower than 80 ° C., and it was found that the dropping point can be appropriately improved in the present embodiment in which the grease is mixed with petrolatum. In addition, it was found that when the mixing ratio of grease was increased, the dropping point increased. As shown in FIG. 1, in Example 6 in which 50% of the grease was added, the dropping point increased to about 150 ° C. However, even if the dropping point becomes too high, adequate fluidity of the semisolid lubricating composition can not be obtained, and it becomes difficult to spread the semisolid lubricating composition to the gap inside the wire. The upper limit of the dropping point was set to 150 ° C.

[Heat resistance evaluation temperature-viscosity characteristic test]
Next, a temperature-viscosity characteristic test was conducted using a rheometer. The test conditions are: gap: 300 μm, 25 mm parallel plate, shear rate 10 s ⁻¹ , temperature −20 ° C. to 130 ° C., Examples 1 to 6 and Comparative Examples 1 to 3 and Conventional Examples 1 to 3 The relationship between temperature and viscosity in Conventional Example 2 was examined. The experimental results are shown in FIG.

  As shown in FIG. 2, although the example, the comparative example, and the conventional example have substantially the same viscosity characteristics from -20 ° C to about 30 ° C, when the temperature is about 30 ° C or more, the comparative example and the conventional example It was found that the viscosity was significantly reduced compared to the examples.

Therefore, the viscosity (A) of the example, the comparative example and the conventional example at a shear rate of 10S- ¹ at 70 ° C., and the viscosity of the example, the comparative example and the conventional example at a shear rate of 10S- ¹ at 120 ° C I examined B) respectively.

  As a result, in the example, it is understood that the viscosity change rate [{(A−B) / A)} × 100 (%)] in a high temperature environment (70 ° C. to 120 ° C.) can be suppressed to 90% or less The

[Lubricity evaluation]
Next, the lubricity evaluation was performed by a high speed four-ball test. In the high-speed four-ball test, the fusion load was measured using the samples of Examples, Comparative Examples, and Conventional Examples under the test conditions of 1700 rpm for shaft rotation and 10 seconds of test time according to ASTM D2596. The experimental results are shown in FIG.

  As shown in FIG. 3, the fusion load was higher in the example than in the comparative example and the conventional example. The higher the fusion load, the better the lubricity.

  From the experimental results shown in FIG. 3, it was found that the fusion load in this example can be made higher than 1570N. Specifically, in this example, it was found that the fusion load can be at least 1960 N which is the next load condition of 1570 N or more.

[Rust prevention evaluation]
The steel spray test was performed by applying the samples of the respective examples, the respective comparative examples and the respective conventional examples to a steel plate. The salt spray test conforms to JIS Z 2371 and JIS K 2246. In the experiment, salt water (5% concentration) was sprayed in a specified amount for a specified time, and the number of rusts generated was counted. The test time was evaluated at 500 h.

  As a result, in each Example, while being superior to the prior art example 1, it turned out that the rust prevention property comparable to the prior art example 2 is shown. In addition, D grade and E grade which are shown in Table 1 are evaluation of the rust based on JISZ2371 and JISK2246.

[Water resistance test]
The water resistance test of each Example, each comparative example, and each conventional example was done. In the test, a commercially available wire rope coated with each sample was immersed in water, and then the wire rope was pulled up after applying an ultrasonic cleaner (38 MHz) for 60 minutes. Subsequently, the wire rope was dried to measure the reduction of the sample. The amount of decrease was determined by [(C−D) / C] × 100 (%), where C is the coating amount, and D is the remaining amount after completion of the test. The experimental results are shown in FIG.

  As shown in FIG. 4, while the sample reduction amount (absolute value) is about 20% in each comparative example and each conventional example, the sample reduction amount (absolute value) is 19% or less in each example. I found that I could do it. In the examples, it was found that the amount of sample reduction (absolute value) can be preferably 16% or less, more preferably 15% or less, and still more preferably 13% or less.

  From the above experiments, it was found that the heat resistance (temperature viscosity change), the lubricity, the rust prevention, and the water resistance are excellent in the present example as compared with the comparative example and the conventional example.

Heat resistance, lubricity and water resistance can be improved by applying the semi-solid lubricating composition of the present invention to a wire constituted of metal wires. Therefore, the semisolid lubricating composition of the present invention can be preferably applied to wire ropes, wire cables and the like.

Claims (9)

  A semisolid lubricating composition characterized in that grease is contained in petrolatum.   The semisolid lubricating composition according to claim 1, wherein the mixing ratio of petrolatum to grease is in the range of petrolatum: grease = 95: 5 to 50:50 (weight ratio). Change in viscosity (B) of the semisolid lubricating composition at a shear rate of 10S ⁻¹ at 120 ° C. relative to the viscosity (A) of the semisolid lubricating composition at a shear rate of 10S ⁻¹ at 70 ° C. The semisolid lubricating composition according to claim 1 or 2, wherein the ratio [{(AB) / A)} x 100 (%)] is 90 or less.   The dropping point of the said semisolid lubricating composition is 80 degreeC or more and 150 degrees C or less, The semisolid lubricating composition in any one of the Claims 1-3 characterized by the above-mentioned.   The fusion load in the high-speed four-ball test of the said semi-solid-like lubricating composition is 1960 N or more, The semi-solid-like lubricating composition in any one of the Claims 1-4 characterized by the above-mentioned.   The semisolid lubricant according to any one of claims 1 to 4, wherein a reduction amount in a water resistance test using the ultrasonic cleaner of the semisolid lubricant composition is 19% or less. Composition.   The thickeners contained in the grease include lithium soap, calcium soap, sodium soap, aluminum soap, lithium complex soap, calcium complex soap, aluminum complex soap, urea compound, organic bentonite, polytetrafluoroethylene, silica gel, sodium telefu The semisolid lubricating composition according to any one of claims 1 to 6, which is selected from at least one of taramates.   The semi-solid lubricating composition according to any one of claims 1 to 7, wherein the semi-solid lubricating composition is used by being applied to a wire comprising a metal stranded wire. . A wire comprising metal strands, wherein
A wire in which the semisolid lubricating composition according to any one of claims 1 to 7 is applied to the wire.

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