KR20220052948A - wire rope - Google Patents

Abstract

A wire rope having a core and strands twisted around the outer periphery of the core, wherein at least one of the core and the strands is impregnated with a grease composition, the grease composition comprising: a biodegradable base oil; a thickener; and calcium sulfonate A wire rope comprising a rust inhibitor including a complex and a sorbitan fatty acid ester, wherein the total content of biodegradable organic substances in the grease composition is 75 mass % or more, and the content of the rust inhibitor is 2.5 to 30 mass %.

Description

wire rope

[0001] The present invention relates to a wire rope impregnated with a grease composition that has little influence on the environment and has rust-preventive properties against salt water.

In recent years, interest in the protection of water resources and the marine environment is increasing. For example, in the United States, with respect to equipment using oil for all ships entering a port, at the reception area where there is a possibility of oil leakage, biodegradable, non-toxic and The Vessel General Permit (VGP), which mandates the use of Environmentally Acceptable Lubricants (EAL), recognized for its non-bioaccumulative potential, has been implemented. From these circumstances, the development of biodegradable grease for the purpose of preventing pollution of the ocean, lakes, swamps, rivers, etc. is urgently needed.

Patent Document 1 describes a low-environment load type wire rope impregnated with a lubricant, but the biodegradability of the lubricant is not sufficient.

Patent Document 1 JP 2012-219401A

An object of the present invention is to provide a wire rope impregnated with a grease composition that has little influence on the environment and has excellent rust prevention properties against salt water such as seawater.

As a result of intensive research, the present inventors have found that a grease composition containing a biodegradable base oil, a thickener, and a rust preventive agent including a calcium sulfonate complex and a sorbitan fatty acid ester has excellent rust prevention properties against salt water. Moreover, it was discovered that it can be set as the grease composition suitable for manufacture of a wire rope by making melting|fusing point into a predetermined range, and this invention was completed.

That is, the present invention

[1] A wire rope comprising a core and a strand twisted around the outer periphery of the core, wherein at least one of the core and the strand is impregnated with a grease composition, the grease composition comprising: a biodegradable base oil; , a thickener, a rust inhibitor containing a calcium sulfonate complex and a sorbitan fatty acid ester, the total content of biodegradable organic substances in the grease composition is 75 mass % or more, and the content of the rust inhibitor is 2.5 to 30 mass % Wire rope characterized by

[2] The wire rope according to [1], wherein the content of the calcium sulfonate complex with respect to the sorbitan fatty acid ester (the content of the calcium sulfonate complex / the content of the sorbitan fatty acid ester) is 0.5 to 5.0;

[3] The wire rope according to [1] or [2], wherein the grease composition has a melting point of 45 to 100 ° C;

[4] The wire rope according to any one of [1] to [3], wherein the grease composition further contains a biodegradable wax;

[5] The wire rope according to [4], wherein the content of the biodegradable wax in the total amount of the biodegradable base oil and the biodegradable wax is 5.0 to 40 mass%;

[6] The wire rope according to any one of [1] to [5], wherein the content of the thickener in the grease composition is 1.0 to 25% by mass;

[7] A method for manufacturing a wire rope comprising a core steel and a strand twisted around the outer periphery of the core steel, comprising a biodegradable base oil, a thickener, and a rust inhibitor including a calcium sulfonate complex and a sorbitan fatty acid ester, heating the grease composition to a temperature at which a grease composition having a total content of biodegradable organic substances in the composition of 75% by mass or more and a content of a rust preventive agent of 2.5 to 30% by mass melts, and in the core steel and the strands A manufacturing method comprising the step of impregnating at least one of the grease compositions;

[8] The manufacturing method according to [7], wherein the heating temperature of the grease composition is 50 to 130°C.

The grease composition impregnated into the wire rope of the present invention has little influence on the environment and has excellent rust prevention properties against salt water such as seawater. In addition, since metal-based additives such as zinc and molybdenum used in general grease are not used, the risk of toxicity and accumulation to living organisms is low.

Moreover, by making melting|fusing point of a grease composition into a predetermined range, it can be set as the grease composition suitable for manufacture of a wire rope.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view (side view of the state which loosened a part) of the wire rope which concerns on one Embodiment of this invention.

The manufacturing procedure of the wire rope including preparation of the grease composition which is one Embodiment of this invention is demonstrated in detail below. However, the following description is an example for explaining the present invention, and is not intended to limit the technical scope of the present invention to this description range. In addition, in this specification, when expressing a numerical range using "-", it shall include the numerical value at both ends.

<Grease composition>

The grease composition according to the present embodiment contains a biodegradable base oil, a thickener, and a rust preventive agent including a calcium sulfonate complex and a sorbitan fatty acid ester, and preferably contains a biodegradable wax, and is biodegradable in the composition. It is characterized in that the total content of organic substances having properties (particularly, biodegradable base oil, biodegradable wax, and sorbitan fatty acid ester) is 75% by mass or more. In addition, in the above VGP, in accordance with the OECD Test Guideline 301 series, a standard test method for measuring the reverse biodegradability of organic substances, a predetermined degree of biodegradability (for example, according to the OECD Test Guideline 301B, It is stipulated that the grease composition contains 75% by mass or more of organic substances having a biodegradability of 60% or more) in the grease composition, and the grease composition according to the present embodiment is also designed in this way to respond to VGP.

(base oil)

As the base oil, in accordance with the OECD Test Guideline 301 series, a base oil that has a predetermined degree of biodegradability and is judged to have biodegradability is very suitably used (hereinafter, in the present specification, such a base oil is simply referred to as “biodegradable”). It is also referred to as “base oil with”).

The base oil having biodegradability is not particularly limited, but includes vegetable oil, animal oil, synthetic ester oil, polyalkylene glycol, synthetic hydrocarbon oil, and the like. From the viewpoint of rust prevention and water resistance, synthetic ester oil and vegetable oil are preferable. . Moreover, synthetic ester oil is more preferable from a viewpoint of oxidation stability and storage stability under high temperature, and a vegetable oil is preferable from a viewpoint of safety, such as cost, a high biodegradation rate, and toxicity and accumulation|storage property.

In this specification, "vegetable oil" is a plant-derived oil, and is a concept including fats and oils. The vegetable oil that can be used in the present embodiment is not particularly limited, and for example, cocoa butter fat, corn oil, peanut oil, sunflower oil, soybean oil, palm oil, olive oil, camellia oil, safflower oil, tung oil (tung oil), flaxseed oil, coconut oil, confectionery oil, almond oil, anzu's human oil, castor oil, rapeseed oil, chaulmoogra oil, cinnamon oil, cottonseed oil, charm oil, palm oil, palm kernel oil, rice bran oil, These include Chinese wood oil, turpentine oil, kapok oil, and the like, corn oil, sunflower oil, bird flower oil, castor oil, flaxseed oil, soybean oil, rapeseed oil, cottonseed oil, olive oil, camellia oil. At least one selected from the group consisting of oil, paulownia oil, turpentine oil, palm oil and palm oil is preferable. Also, it may be a mixture of a plurality of these oils, oils and fats containing diglycerides or monoglycerides, and oils that have undergone denaturation such as oxidation, reduction, and the like.

As commercially available vegetable oil, For example, Marusho Company Limited's vegetable oil, such as soybean oil KT; Nissin Oilio Group Ltd. vegetable oil, such as soybean white kyo oil and flaxseed oil; Boso Oil & Fat Company Lippi, such as rice salad oil Vegetable oils manufactured by Cognis Japan Limited, such as TEXAPRINTSDCE manufactured by Ted; Vegetable oils manufactured by Atschi Company Limited, such as limonene oil, eucalyptus oil, and paulownia oil; Harima such as HARTALL SR-20, HARTALL SR-30, and HARTALL R-30 Vegetable oil manufactured by Chemicals Group, Inc.; Turpentine manufactured by Arakawa Chemical Industries Ltd. such as α-pinene, Toyo Matsujirushi, and Dipentene; Industrial No. 1 castor oil manufactured by Hokoku Corporation. It is not limited.

In this specification, "animal oil" is an animal-derived oil, and is a concept including fats and oils. Examples of the animal oil that can be used in the present embodiment include fish oils obtained from the body of fish such as sardine oil, mackerel oil, herring oil, saury oil, tuna oil, and cord river oil; lard fat, chicken fat, butter fat, tallow, beef rib; There are deer fat, dolphin fat, horse fat, lard fat, bone oil, sheep fat, neat's foot oil, rat dolphin oil, shark oil, sperm whale oil, whale oil, etc., and fish oil , it is preferably at least one oil selected from the group consisting of tallow and lard, and may be a mixture of a plurality of these oils, oils and fats including diglycerides or monoglycerides, some of which have undergone denaturation such as oxidation or reduction.

As synthetic ester oil, fatty acid diester and fatty acid polyol ester are used suitably, and fatty acid polyol ester is more preferable. As a specific example of fatty acid diester, diisodecyl adipate, diisodecyl azeraic acid, dioctyl sebacate, etc. are mentioned, for example. As a specific example of fatty acid polyol ester, neopentyl glycol diester, trimethylol propane triester, trimethylol propane complex ester, pentaerythritol tetraester, dipentaerythritol hexaester, etc. are mentioned, for example. Among them, Synative ES TMP 05/140 and 05/320 (trimethylolpropane complex ester) manufactured by BASF Japan Limited, Croda Japan K.K. Takao degradable ester oils, such as Priolube 2089 (trimethylol propane oleate) manufactured by the product, and MINERASOL LB-601 (special castor oil type condensed fatty acid ester) manufactured by Ito Oil Chemicals Co., Ltd. are suitably used.

Examples of the polyalkylene glycol include polyethylene glycol, polypropylene glycol, polyethylene oxide-propylene oxide (a copolymer of ethylene oxide and propylene oxide), poly(methyl-ethylene) glycol, polybutylene glycol, and the like. there is. Moreover, as for polyalkylene glycol, the random copolymer of polyalkylene glycol obtained using 2 or more types using different alkylene oxide, an alternating copolymer, a block copolymer, and a mixture thereof can all be used.

As synthetic hydrocarbon oil, FT synthetic oil etc. are mentioned, for example. As used herein, "FT synthetic oil" is a liquid equivalent to naphtha, kerosene, or light oil obtained by applying a Fischer-Tropsch (FT) reaction to a mixed gas containing hydrogen and carbon monoxide as main components (also referred to as synthesis gas). It refers to a synthetic oil composed of an oil fraction, a hydrocarbon mixture obtained by hydrorefining and hydrocracking them, and a hydrocarbon mixture obtained by producing a liquid oil fraction and FT wax by FT reaction, and hydrorefining and hydrocracking this. In addition, as for FT synthetic oil, the name according to the raw material is used in many cases, for example, what uses natural gas as a raw material is called GTL, what uses coal as a raw material is called CTL, and what uses biomass as a raw material is called BTL.

As for the base oil having said biodegradability, any 1 type may be used individually in the thing of the said illustration, and may use 2 or more types together. Preferably, one or more types of synthetic ester oil or the base oil which mixed these with one or more types of vegetable oil is mentioned. When two or more types of biodegradable base oils are used in combination, an improvement in lubricity can be expected.

The content of the biodegradable base oil in the grease composition is preferably 60 mass % or more, more preferably 65 mass % or more, still more preferably 70 mass % or more, still more preferably 75 mass % or more, and 80 mass % or more. The above is particularly preferred.

Moreover, as a base oil, it is also possible to use together the base oil which is a normal base oil used for a grease composition for lubricity improvement, etc., and is judged not to have predetermined|prescribed biodegradability based on the OECD Test Guideline 301 series. However, in accordance with the OECD Test Guideline 301 series in the grease composition, it is necessary to make it less than 25% by mass based on the total amount of organic substances having a predetermined biodegradability.

230 degreeC or more is preferable and, as for the flash point of a base oil, 260 degreeC or more is more preferable. When the flash point of a base oil is 230 degreeC or more, it is hard to produce ignition to a grease composition. In addition, in this embodiment, the flash point of a base oil is computable by the Cleveland open type (COC) of JISK22654.

70 mm<2>/s or more is preferable and, as for the kinematic viscosity (40 degreeC) of a base oil, 90 mm<2>/s or more is more preferable. Moreover, 1000 mm<2>/s or less is preferable and, as for the kinematic viscosity (40 degreeC) of a base oil, 600 mm<2>/s or less is more preferable. When the kinematic viscosity of the base oil is within the above range, the flash point of the base oil is easily maintained at a high temperature, and the grease composition has good fluidity (pressure-feeding property). In addition, in this embodiment, the kinematic viscosity of a base oil is computable by JISK2283.

(thickener)

The thickener that can be used in the present embodiment is not particularly limited, and those commonly used for lubricating greases, such as polybutene, isobutene, polyisobutylene, and α-olefin copolymer, can be appropriately selected. The thickener may be a thickener judged to have biodegradability (eg, polyisobutylene, etc.) having a predetermined degree of biodegradability in accordance with the OECD Test Guideline 301 series.

The thickener is preferably at least 1.0 mass%, more preferably at least 3.0 mass%, still more preferably at least 5.0 mass%, particularly preferably at least 7.0 mass% in the grease composition. Moreover, as for content of a thickener, 25 mass % or less is preferable, 20 mass % or less is more preferable, 15 mass % or less is still more preferable, 12 mass % or less is especially preferable. When content of a thickener is in the said range, there exists an advantage of improving adhesiveness, without affecting a press-feeding property.

(rust inhibitor)

Calcium sulfonate complex and sorbitan fatty acid ester are used suitably as a rust preventive agent in this embodiment. By using the calcium sulfonate complex and the sorbitan fatty acid ester together, a synergistic rust prevention effect can be obtained.

The calcium sulfonate complex contains calcium sulfonate, (i) calcium carbonate, (ii) calcium dibehenate, calcium distearate, calcium dihydroxystearate, and other higher fatty acid calcium salts, (iii) calcium acetate, etc. A calcium salt (calcium soap) selected from lower fatty acid calcium salt, (iv) calcium borate, and the like is combined. Among them, calcium sulfonate and calcium carbonate as essential components, and at least two selected from the group consisting of calcium dibehenate, calcium distearate, calcium dihydroxystearate, calcium borate and calcium acetate It is preferable to mix. Specific examples of the calcium sulfonate complex include those marketed under trade names such as Daphne Multilex WR manufactured by Idemitsu Kosan Co., Ltd., RENOLIT CXI 1 manufactured by Hooks Japan Ltd., and Calfores EP manufactured by Nipepco Ltd., for example.

Moreover, from the viewpoint of the thickening effect, calcium sulfonate preferably has a base value of 50 mgKOH/g or more and 500 mgKOH/g or less, and more preferably 300 mgKOH/g or more and 500 mgKOH/g or less. Specifically, a calcium salt of dialkylbenzenesulfonic acid is particularly preferable.

As sorbitan fatty acid ester, For example, sorbitan monooleate, sorbitan trioleate, sorbitan monolaurate, sorbitan tristearate, sorbitan monostearate, sorbitan monopalmitate, polyoxyethylene Sorbitan monolaurate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc. are mentioned. As the sorbitan fatty acid ester, for example, a sorbitan fatty acid ester marketed under the trade name of Emazole by Kao Corporation or the like can be used. In addition, sorbitan fatty acid ester is an organic substance having biodegradability in accordance with the OECD Test Guideline 301 series. In particular, since sorbitan monooleate is a substance prescribed by the rule "FDA21CFR178.3570", it has high safety for the human body as long as the prescribed prescribed value is observed. The sorbitan fatty acid ester preferably has a saponification value of 145 to 160 and a hydroxyl value of 193 to 210. When saponification and hydroxyl value are out of the range of 193 to 210, it becomes difficult to ensure safety as a food ingredient. In addition, sorbitan fatty acid ester is an organic substance having biodegradability in accordance with the OECD Test Guideline 301 series. In particular, since sorbitan monooleate is a substance prescribed by the rule "FDA21CFR178.3570", it has high safety for the human body as long as the prescribed prescribed value is observed. The sorbitan fatty acid ester preferably has a saponification value of 145 to 160 and a hydroxyl value of 193 to 210. When saponification and hydroxyl value are out of the range of 193 to 210, it becomes difficult to ensure safety as a food ingredient.

The content of the calcium sulfonate complex with respect to the sorbitan fatty acid ester (content of the calcium sulfonate complex/content of the sorbitan fatty acid ester) is preferably in the range of 0.5 to 5.0, more preferably in the range of 0.7 to 3.0, and more preferably in the range of 1.0 to A range of 2.0 is more preferable. When less than 0.5 or more than 5.0, there exists a tendency for the synergistic effect of rust prevention property to weaken.

The rust preventive agent may contain other rust preventive agents other than said calcium sulfonate complex and sorbitan fatty acid ester suitably. Other rust inhibitors include, for example, sulfonic acid salts, carboxylic acids, carboxylates, ester rust inhibitors, and amine rust inhibitors. Any one of the other rust inhibitors from those exemplified above may be used alone, or two or more. may be used in combination.

The sulfonate salts include sulfonic acid metal salts such as alkali metal sulfonic acid salts and sulfonic acid alkaline earth metal salts, sulfonic acid amine salts, and the like. A sulfonate can be prepared by making an alkali metal, an alkaline-earth metal, or an amine and a sulfonic acid react.

As the sulfonic acid constituting the sulfonic acid salt, petroleum sulfonic acid and dinonylnaphthalenesulfonic acid are preferable. Examples of the alkali metal constituting the sulfonate include sodium and potassium. Examples of the alkaline earth metal include magnesium, calcium, barium and the like. Among these, as a metal salt, a sodium salt, a potassium salt, a calcium salt, or a barium salt is preferable, and a calcium salt is more preferable. Moreover, when a sulfonate is an amine salt, monoamine, a polyamine, an alkanolamine, etc. are illustrated as for an amine.

Among the sulfonates, amine sulfonate, calcium sulfonate, or barium sulfonate is preferably included, calcium sulfonate is more preferable, and petroleum sulfonic acid calcium salt is still more preferable. In addition, any 1 type may be used individually from the thing of the said illustration, and a sulfonate may use 2 or more types together.

Examples of the carboxylic acid include monocarboxylic acids such as stearic acid, alkyl succinic acid and its derivatives, alkenyl succinic acid and its derivatives, naphthenic acid, abietic acid, and lanolin fatty acid. As a carboxylate, the metal salt (calcium, barium, magnesium, aluminum, zinc, lead, etc.) of the said carboxylic acid is mentioned.

Examples of the ester-based rust inhibitor include carboxylic acid partial esters such as polyoxyethylene laurate, polyoxyethylene oleate, polyoxyethylene stearate, pentaerythritol monooleate, and succinic acid half ester. . The ester-based rust inhibitor is suitably used because it has good biodegradability.

As an amine-type rust preventive agent, amine derivatives, such as an alkoxyphenylamine, dialkaline carboxylic acid partial amide, etc. are mentioned, for example.

Content of a rust preventive agent is 2.5 mass % or more in a grease composition, 3.0 mass % or more is preferable, and 4.0 mass % or more is more preferable. When content of a rust preventive agent is less than 2.5 mass %, there exists a tendency for the rust prevention property with respect to salt water to fall. On the other hand, from the viewpoint of reducing non-biodegradable organic substances, the content of the rust inhibitor is 30 mass % or less, preferably 25 mass % or less, more preferably 20 mass % or less, and still more preferably 15 mass % or less.

(wax)

As the wax, in accordance with the OECD Test Guideline 301 series, a wax that has a predetermined degree of biodegradability and is judged to have biodegradability is very suitably used (hereinafter, in this specification, such a wax is simply referred to as “biodegradability”). It is sometimes referred to as “wax with”). The biodegradable wax can be used as a substitute for a thickener, and can contain an appropriate amount in order to adjust the melting point of the grease composition, which will be described later.

As the biodegradable wax, known plant waxes, animal waxes, petroleum waxes and the like can be used. Examples of the plant wax include rice wax, carnauba wax, and candy lira wax. Examples of the animal wax include beeswax, lanolin, and spermaceti wax. As a petroleum wax, microcrystalline wax, paraffin wax, etc. are mentioned, for example. Also, synthetic waxes having biodegradability can be used.

The total content of the biodegradable base oil and the biodegradable wax is preferably 60 mass % or more, more preferably 65 mass % or more, more preferably 70 mass % or more, and 75 mass % or more in the grease composition. This is more preferable, and 80 mass % or more is especially preferable.

The content of the biodegradable wax in the total amount of the biodegradable base oil and the biodegradable wax is preferably 5.0 mass % or more, more preferably 6.0 mass % or more, still more preferably 7.0 mass % or more, 10 % by mass or more is particularly preferred. Moreover, 40 mass % or less is preferable, as for the said content, 35 mass % or less is more preferable, 30 mass % or less is still more preferable, and its 25 mass % or less is especially preferable.

(Other ingredients)

The grease composition of the present embodiment may contain components (other components) other than the above-described base oil, thickener, rust preventive agent, and wax as long as the effects of the present embodiment are not impaired. The other components are not particularly limited, and examples thereof include thickeners, anti-wear agents, antioxidants, extreme pressure additives, dyes, color stabilizers, structural stabilizers, metal deactivators, and viscosity index improvers.

When a thickener is contained, as a thickener, Metal soaps, such as lithium soap, calcium soap, sodium soap, aluminum soap, lithium complex soap, calcium complex soap, aluminum complex soap, a urea type compound, sodium terephthalamate, poly Although tetrafluoroethylene (PTFE), organic bentonite, silica gel, etc. are mentioned, Lithium soap is used suitably from a viewpoint of having no major drawbacks and a good performance balance (eg, water resistance, shear stability, etc.).

When a thickener (especially aluminum complex soap) is contained, the content thereof in the grease composition is preferably less than 1.0 mass%, more preferably less than 0.5 mass%, still more preferably less than 0.1 mass%, and no thickener. Especially preferred. When the content of the thickener is 1.0% by mass or more, repeated heating and melting and cooling makes it impossible to maintain the state as grease, such as softening of grease or separation of oil, and there is a possibility that the additive may deteriorate and rust prevention properties may be lowered. It is preferable not to contain an aluminum composite soap.

When an anti-wear agent is contained, examples of the anti-wear agent include methylenebisdithiocarbamate, a sulfur-based anti-wear agent, and a phosphorus-based anti-wear agent. An antiwear agent may be used individually by any 1 type from the thing of the said illustration, and may use 2 or more types together. In addition, the grease composition of the present embodiment can exhibit excellent wear resistance even when no anti-wear agent is incorporated.

The phosphorus-based antiwear agent includes phosphites typified by tributylphosphite and trioleyl phosphite; phosphates typified by tricresidyl phosphate and dilauryl acid phosphate; dibutyloctylamine phosphate and dira phosphate. Amine phosphates typified by uryloctylamine salts; Phosphorothionates typified by triphenyl phosphorothionate and alkylated phosphorothionate; Solid lubricants typified by calcium phosphate; And diphenyl Hydrogen phosphite etc. are illustrated.

When an anti-wear agent is contained, the content of the anti-wear agent is not particularly limited. For example, 0.1 mass % or more is preferable in a grease composition, and, as for an abrasion resistance agent, 0.5 mass % or more is more preferable. Moreover, 5 mass % or less is preferable and, as for an abrasion resistance, 3 mass % or less is more preferable. When the content of the anti-wear agent is within the above range, the obtained grease composition can be imparted with excellent wear resistance.

When antioxidant is contained, an amine antioxidant etc. are illustrated as antioxidant. It is preferable that an amine antioxidant is an aromatic amine compound. Aromatic amine compounds include diphenylamine, alkylated diphenylamine, phenothiazine, N-phenyl-α-naphthylamine, p,p′-diaminodiphenylmethane, aldol-α-naphthylamine, and p-dode. Sylphenyl-1-naphthylamine etc. are illustrated.

When antioxidant is contained, content of antioxidant is not specifically limited. For example, 0.1 mass % or more is preferable in a grease composition, and, as for antioxidant, 0.5 mass % or more is more preferable. Moreover, 5 mass % or less is preferable and, as for antioxidant, 3 mass % or less is more preferable. When the content of the antioxidant is within the above range, the obtained grease composition can be imparted with excellent oxidation stability.

When the extreme pressure additive is contained, examples of the extreme pressure additive include molybdenum dithiocarbamate, molybdenum dithiophosphate, thiophosphoric acid ester, sulfurized oil, dibenzyl sulfide, and dibutyl disulfide. Among them, sulfurized oils and fats are preferable. The extreme pressure additive may be used individually by any 1 type of the thing of the said illustration, and may use 2 or more types together.

When the extreme pressure additive is contained, the content of the extreme pressure additive is not particularly limited. For example, 0.1 mass % or more is preferable in a grease composition, and, as for an extreme pressure additive, 0.5 mass % or more is more preferable. Moreover, 5 mass % or less is preferable and, as for an extreme-pressure additive, 3 mass % or less is more preferable. When the content of the extreme pressure additive is within the above range, the obtained grease composition can be provided with excellent load resistance.

The melting point of the grease composition is preferably 45°C or higher, more preferably 50°C or higher, still more preferably 55°C or higher, and particularly preferably 60°C or higher, from the viewpoint of preventing grease from sagging from the wire rope. Further, the melting point of the grease composition is preferably 100° C. or less, more preferably 95° C. or less, and more preferably 90° C. or less, from the viewpoint of preventing deterioration of the grease composition and preventing difficult application in the wire rope production line. It is more preferable, and 85 degrees C or less is especially preferable.

The grease composition according to the present embodiment has low bioaccumulation properties even when accidentally leaked into the sea or river, and is safe for the human body. In addition, it has the same or higher rust prevention, water resistance, water repellency and adhesion properties as industrial lubricants.

<wire rope>

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view (side view of the state which loosened a part) of the wire rope which concerns on one Embodiment of this invention. The wire rope 1 has a core 2 and a strand 3 twisted around the outer periphery of the core. In addition, at least one of the core cavity and the strand is impregnated with a grease composition.

The core steel 2 is made of metal (eg, steel, etc.), synthetic resin fibers (eg, polypropylene, polyester, polyethylene, etc.), or a plurality of strands (eg, hemp, etc.) 21) is twisted. The grease composition may be impregnated by pressing, heating, or heating under pressure when twisting the plurality of strands 21 , or may be impregnated after twisting the plurality of strands 21 . Although the heating temperature is not particularly limited as long as it is a temperature at which the grease composition dissolves, it is usually in the range of 50 to 130°C, and preferably 70 to 100°C.

The strand 3 is formed by twisting a plurality of strands 31 made of metal (eg, steel or the like). A plurality of the strands 3 are usually twisted around the outer periphery of the core 2 . The grease composition may be impregnated by pressing, heating, or heating under pressure when twisting the plurality of strands 31 , or may be impregnated after twisting the plurality of strands 31 . Although the heating temperature is not particularly limited as long as it is a temperature at which the grease composition dissolves, it is usually in the range of 50 to 130°C, and preferably 70 to 100°C.

Since the wire rope according to the present embodiment has excellent rust prevention properties against salt water such as seawater, a parachute connecting cable, a boat pole, a guy rope, a tow line, a cargo pole, a wire rope for ships such as a topping lift; Wire ropes for fisheries such as ropes, trawl nets, and girder wire ropes; Wire ropes in contact with water, such as sluice wire ropes, and quay walls such as unloaders and gantry cranes It is very suitably used as a wire rope for cranes used in (岸壁).

The corrosion resistance of the wire rope which concerns on this embodiment can be evaluated by the salt spray test of JISZ2371:2015, for example.

(Example)

Hereinafter, the present invention will be described in more detail by way of Examples. The present invention is not limited in any way to these Examples.

Hereinafter, various materials used for Examples and Comparative Examples are summarized and shown.

Synthetic ester oil: Synative ES TM P05/320 manufactured by BASF Japan Limited (trimethylolpropane complex ester, kinematic viscosity (40°C): 326 mm2/s)

Wax: Paraffin Wax 155F manufactured by Nippon Seiro Company Limited

Thickener: Idemitsu Polybutene 2000H manufactured by Idemitsu Kosan Co., Ltd.

Calcium sulfonate complex: Daphne Multilex WR manufactured by Idemitsu Kosan Co., Ltd.

Sorbitan fatty acid ester 1: Emazol O-10V (sorbitan monooleate) manufactured by Kao Corporation

Sorbitan fatty acid ester 2: Emazol O-30V (sorbitan trioleate) manufactured by Kao Corporation

(Examples 1 to 8 and Comparative Examples 1 to 4)

According to the prescription described in Table 1, a grease composition was prepared. The following evaluation was performed about the obtained grease composition. An evaluation result is shown in Table 1.

<Measurement of melting point>

In accordance with JIS K 2235, the melting point of the grease composition was measured.

<Neutral salt spray test>

In accordance with JIS K 22466.35, a test piece coated with a test grease composition (film preparation method conforms to JIS K 222021) under an environment of 35 ° C., in an apparatus sprayed with neutral salt water for a specified period of time, the degree of rust was investigated. . Table 1 shows the spraying times of salt water with a degree of rust generation of 0%. 240 hours or more is set as the performance target value.

From the results in Table 1, it can be seen that the grease composition impregnated in the wire rope of the present invention has excellent rust prevention properties against salt water.

<Production of wire rope>

As the core steel 2, a braid of 49 steel wires 21 was used, and as the strand 3, a braid of 36 steel wires 31 was used. The said grease composition was respectively apply|coated to the said core steel 2 and the said strand 3 produced by twisting a strand by heating to 80 degreeC with a heater and melting|fusing. Thereafter, the six strands 3 impregnated with the grease composition were twisted around the outer periphery of the core 2 to prepare a wire rope.

The wire rope impregnated with the grease composition of the present invention is particularly useful as a wire rope in contact with water because it has little influence on the environment and has excellent rust prevention properties against salt water such as seawater.

One; wire rope, 2; heart cavity, 3; strand,
21; Small gland (cardiac cavity), 31; strands (strands).

Claims (8)

In a wire rope comprising a core and a strand twisted around the outer periphery of the core,
At least one of the core and the strand is impregnated with a grease composition,
The grease composition contains a biodegradable base oil, a thickener, and a rust preventive agent including a calcium sulfonate complex and a sorbitan fatty acid ester,
A wire rope characterized in that the total content of biodegradable organic substances in the grease composition is 75% by mass or more, and the content of the rust preventive agent is 2.5 to 30% by mass. The method according to claim 1,
The wire rope whose content of calcium sulfonate complex with respect to sorbitan fatty acid ester (content of a calcium sulfonate complex / content of sorbitan fatty acid ester) is 0.5-5.0. The method according to claim 1 or 2,
A wire rope, wherein the melting point of the grease composition is 45 to 100°C. 4. The method according to any one of claims 1 to 3,
A wire rope, wherein the grease composition further contains a wax having biodegradability. 5. The method according to claim 4,
The content of the biodegradable wax in the total amount of the biodegradable base oil and the biodegradable wax is 5.0-40 mass %, the wire rope. 6. The method according to any one of claims 1 to 5,
The content of the thickener in the grease composition is 1.0-25 mass %, The wire rope. In the manufacturing method of a wire rope having a core and a strand twisted on the outer periphery of the core,
It contains a biodegradable base oil, a thickener, and a rust inhibitor including a calcium sulfonate complex and a sorbitan fatty acid ester, and the total content of biodegradable organic substances in the composition is 75% by mass or more, and the content of the rust inhibitor is 2.5 to heating the grease composition to a temperature at which 30 mass % of the grease composition melts, and
A manufacturing method including a step of impregnating at least one of the core cavity and the strand with a grease composition. 8. The method of claim 7,
The heating temperature of the grease composition is 50 to 130 ℃, the manufacturing method.

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