WO2015030252A1 - 潤滑被膜形成用組成物及び鋼管用ねじ継手 - Google Patents
潤滑被膜形成用組成物及び鋼管用ねじ継手 Download PDFInfo
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- WO2015030252A1 WO2015030252A1 PCT/JP2014/073010 JP2014073010W WO2015030252A1 WO 2015030252 A1 WO2015030252 A1 WO 2015030252A1 JP 2014073010 W JP2014073010 W JP 2014073010W WO 2015030252 A1 WO2015030252 A1 WO 2015030252A1
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/16—Paraffin waxes; Petrolatum, e.g. slack wax
- C10M2205/163—Paraffin waxes; Petrolatum, e.g. slack wax used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/283—Esters of polyhydroxy compounds
- C10M2207/2835—Esters of polyhydroxy compounds used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/34—Lubricating-sealants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/06—Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
- F16L15/004—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with axial sealings having at least one plastically deformable sealing surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/182—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for screw-threaded joints
Definitions
- the present invention relates to a composition for forming a lubricating coating and a threaded joint for steel pipes.
- Oil well pipes that are used in oil well drilling and that have a tube in which a fluid such as crude oil flows and a casing that surrounds the tube are generally fastened with a steel pipe having a length of about a dozen or so meters on the spot by a threaded joint. Assembled by.
- the depth of an oil well is 2000 m to 3000 m, but in a recent deep oil well such as an offshore oil field, it reaches 8000 m to 10,000 m.
- API American Petroleum Institute
- goling Even after tightening (make-up) and loosening back (breakout) 10 times for tubing joints and 3 times for casing joints. It does not happen and requires airtightness to be maintained.
- a pin-box threaded joint As a threaded joint for steel pipes with excellent sealing properties, there is a pin-box threaded joint, and a pin having a male threaded portion and a threadless metal contact portion (seal portion and shoulder portion) formed on the pipe end outer surface of the steel pipe.
- a coupling box of another member having an internal thread part formed on the inner surface and an unthreaded metal contact part (seal part and shoulder part)
- the seal parts of both unthreaded metal contact parts are fitted. Make contact.
- Grease lubrication called compound grease containing a large amount of heavy metal powders such as Pb and Zn prior to tightening, in order to improve lubricity and airtightness, in the threaded portion and the unthreaded metal contact portion that become the fitting portion Oil has been applied.
- surface treatment for example, phosphate treatment
- compound grease is also excellent in rust prevention, and can protect screw joints that can be exposed to harsh environments during storage from rust.
- OSPAR Ospearl Convention on the Prevention of Marine Pollution in the Northeast Atlantic
- This evaluation item for environmental impact is defined by OSPAR as HOCNF (Harmonized Offshore Chemical Notification Format), and is an evaluation of biochemical oxygen demand (BOD) which is one of biodegradability indicators. Is an important item.
- Patent Documents 1 to 3 propose compositions for forming a lubricating film on the fitting portion of a threaded joint for steel pipes without applying compound grease.
- composition for forming a lubricant film for threaded joints proposed in the following Patent Documents 1 to 3 considers lubricity and anticorrosion properties, but biodegradability has become an important evaluation item today. Is not taken into account.
- Japanese Unexamined Patent Publication No. 2002-173692 Japanese Unexamined Patent Publication No. 2004-53013 Japanese National Table 2004-507698 Japanese Unexamined Patent Publication No. 2008-95019
- a composition for forming a lubricant film for a threaded joint considering biodegradability is described in Patent Document 4 described above, but its biodegradability is not sufficient.
- Grease considering biodegradability (generally called biodegradable grease) is also known.
- conventional biodegradable grease is designed for the purpose of lubrication of bearings, etc., so it lacks lubricity against the severe sliding that occurs when fastening threaded joints for steel pipes, and is exposed at the site of use. Rust prevention is also insufficient.
- the steel pipe threaded joint may be subjected to copper plating to prevent seizure at the time of fastening, but there is a problem that the lubricating film component contained in the conventional biodegradable grease tends to corrode copper.
- the present invention has been made in view of the above circumstances, and has a lubricating film forming composition excellent in lubricity, rust resistance, biodegradability, stickiness resistance and corrosion resistance to copper, and formation of the lubricating film It aims at providing with the threaded joint for steel pipes which has the composition for water.
- the composition for forming a lubricating coating according to one aspect of the present invention comprises: 40-80% by mass of a base oil consisting of one or more selected from pentaerythritol fatty acid ester and trimethylolpropane fatty acid ester; 5 to 20% by mass of a drying agent comprising a wax; and 10 to 40% by mass of a solid lubricant comprising at least one selected from an alkali metal salt and an alkaline earth metal salt of hydroxystearic acid.
- the total content of the base oil, the drying agent, and the solid lubricant is 85% by mass or more and 100% by mass or less, and does not include heavy metals.
- the base oil is composed of one or more selected from pentaerythritol tetraoleate, trimethylolpropane trioleate, and trimethylolpropane triisostearate. May be.
- the solid lubricant comprises one or more selected from calcium hydroxystearate, lithium hydroxystearate, and sodium hydroxystearate. Also good.
- a threaded joint for steel pipes according to an aspect of the present invention is a threaded joint for steel pipes composed of a pin and a box each having a threaded portion and an unthreaded metal contact portion as a fitting portion. At least one of the fitting portions has a lubricating film formed from the lubricating film forming composition according to any one of the above (1) to (3).
- pentaerythritol fatty acid ester and “trimethylolpropane fatty acid ester” are the complete esters of the respective polyhydric alcohols, that is, “tetrafatty ester of pentaerythritol” and “trifatty acid ester of trimethylolpropane”. "Means.
- a lubricating film forming composition excellent in lubricity, rust prevention, biodegradability, stickiness resistance, and corrosion resistance to copper, and a threaded joint for steel pipes having the lubricating film forming composition. Can be provided.
- Biodegradability In order to evaluate the environmental impact on the ocean, one of the following methods generally adopted as a method for evaluating biodegradability in seawater should be adopted according to the evaluation of the specimen. To do.
- OECD Guidelines for testing of chemicals-1992 OECD 306 Biodegradability in Seawater, Closed Bottle Method.
- the BOD value after 28 days may be 20% or more in any of the above methods.
- the BOD is an index indicating biodegradability by seawater.
- BOD requirements vary depending on the country or region, but if BOD 28 is 20% or more, the minimum requirement level that can be used in offshore rigs even in the Norwegian standards that set the strictest standards (Red) can be satisfied. In order to satisfy the standard of a higher compatibility level (yellow), it is necessary that the BOD 28 is substantially 60% or more.
- Examples of lubricating oils having a BOD 28 exceeding 60% include vegetable oils, that is, polyhydric alcohol fatty acid esters.
- those having particularly excellent lubricity are pentaerythritol fatty acid ester, trimethylolpropane fatty acid ester, and glycerin fatty acid ester.
- pentaerythritol tetraoleate, trimethylolpropane trioleate, and trimethylolpropane triisostearate is good.
- the lubricity of the coating can be enhanced by adding a solid lubricant in addition to the lubricating oil.
- the solid lubricant is preferably an alkali metal salt or an alkaline earth metal salt of hydroxystearic acid. Of these, calcium hydroxystearate, lithium hydroxystearate, and sodium hydroxystearate are preferable.
- Lubricating coatings composed of solid coatings generally do not cause stickiness on the surface, and it is difficult for foreign matter to adhere to them.
- the solid film does not have the self-repair function of the liquid lubricant film described later, it is remarkable that the metal under the film is exposed due to small scratches on the lubricant film when tightened or loosened. Seizure occurs in a short time.
- the liquid lubricating film made of liquid even if a minute scratch occurs, the liquid lubricating film immediately covers the damaged part, so that intense seizure does not occur.
- a self-repair function of the liquid lubricant is called a self-repair function of the liquid lubricant.
- the lubricity of the liquid lubricant is influenced by the superiority or inferiority of the self-repair function as well as the lubricity of the lubricant itself.
- Base oil In the composition of this embodiment, a fatty acid ester of pentaerythritol and a fatty acid ester of trimethylolpropane represented by the following formula 1 can be used as the base oil that is the main component of the lubricity improving component.
- R is a fatty acid residue, that is, a saturated or unsaturated linear or branched aliphatic group. That is, the R group may contain one or more double bonds or triple bonds. If the carbon number of the R group is too short, the ratio of polar groups in the molecule increases and the miscibility or dispersibility with other oily components deteriorates. On the other hand, if the carbon number of the R group is too short, the viscosity of the base oil becomes too low, the film strength of the formed film is low, and the lubricity may be poor. Also. The stickiness resistance also deteriorates.
- the carbon number of the R group may be in the range of 3-20, preferably 12-18, more preferably 16-18, and most preferably 17.
- oleic acid is preferable as the fatty acid combined with pentaerythritol
- oleic acid and isostearic acid are preferable as the fatty acid combined with trimethylolpropane. It is considered that the base oil is oriented and adsorbed on the screw surface at the polar group portion to form an adsorption layer. At this time, if there is a double bond such as oleic acid, the movement is restrained at the double bond portion of the R group, so that the load resistance is high and the entry of water can be prevented.
- isostearic acid is divided into two carbon chains, each carbon chain is short, but when it is adsorbed, it is densely oriented, so it has high load resistance and can prevent water from entering. . Therefore, oleic acid or isostearic acid is considered good for the fatty acid part of the base oil.
- Pentaerythritol tetraoleate is obtained by combining pentaerythritol and oleic acid.
- Trimethylolpropane trioleate can be obtained by combining trimethylpropane and oleic acid.
- Trimethylolpropane triisostearate is obtained by combining trimethylpropane and isostearic acid.
- the fatty acid ester constituting the base oil is excellent in biodegradability, and also has good lubricity, rust prevention, and corrosion resistance to copper.
- the composition for forming a lubricating coating according to this embodiment contains paraffin wax as a compound for increasing the stickiness resistance of the coating.
- Other waxes can be used as long as they are dried, but paraffin wax is preferred in view of biodegradability and drying performance.
- a paraffin wax having a melting point of 45 ° C. or higher and 60 ° C. or lower is preferable as the paraffin wax used in the present embodiment.
- the form is preferably a powder as described later.
- Solid lubricant A solid lubricant having high biodegradability is added to the composition for forming a lubricant film of the present embodiment as an auxiliary compound for improving lubricity.
- an alkali metal salt or an alkaline earth metal salt of hydroxystearic acid is used as the solid lubricant. Of these, calcium hydroxystearate, lithium hydroxystearate, and sodium hydroxystearate are preferred.
- These solid lubricants are soaps, and they are considered to improve the biodegradability by hydrolyzing the fatty acid portion of the base oil while at the same time exhibiting lubricity while deforming against shear in oil.
- the composition for forming a lubricating coating of the present embodiment has other components as long as it is small in order to improve lubricity, rust prevention, and other performances. May be added.
- the degree of biodegradation of the mixture as a lubricating coating is additive in the relationship between the degree of biodegradation of individual components and the mass fraction, so that other biodegradability of the entire composition does not fall below 60%. Ingredients may be added.
- the total content of the base oil, the drying agent, and the solid lubricant in the composition for forming a lubricant film of the present embodiment is less than 85% by mass in the total composition by adding other components
- the biodegradability of the entire composition may be less than 60%. Therefore, the total content of the base oil, the drying agent, and the solid lubricant in the composition for forming a lubricant film of the present embodiment needs to be 85% by mass or more and 100% by mass or less in the entire composition. It is.
- the biodegradability of the entire composition is a biodegradable value taking into account the proportion of each component constituting the composition, i.e., the product of the biodegradable value for each component multiplied by its content. It is obtained as the sum of products of all components.
- Examples of other components that can be used in this embodiment include basic oils such as basic sulfonates, basic salicylates, basic phenates, and basic carboxylates that have been used in the prior art, various extreme pressure additives, metals Examples include soaps, waxes other than paraffin wax, oily agents, liquid polymers, organic fine powders such as PTFE and polyethylene, SiO 2 and carbon-based nanoparticles.
- basic oils such as basic sulfonates, basic salicylates, basic phenates, and basic carboxylates
- various extreme pressure additives, metals Examples include soaps, waxes other than paraffin wax, oily agents, liquid polymers, organic fine powders such as PTFE and polyethylene, SiO 2 and carbon-based nanoparticles.
- the composition for forming a lubricating coating of the present embodiment contains at least the above base oil, a drying agent, and a solid lubricant.
- the content of these components is 40 to 80% by mass of the base oil, 5 to 20% by mass of the drying agent, and 10 to 40% by mass of the solid lubricant with respect to the entire composition for forming a lubricant film (100%).
- the composition for forming a lubricating film of the present embodiment can be obtained by simply mixing the above base oil, a drying agent, and a solid lubricant, and stirring well to homogenize.
- the drying agent paraffin wax
- the particle diameter of this powder is smaller than the film thickness at the time of forming into a film mentioned later.
- a known mixing method may be used depending on the properties of the components.
- the composition for forming the lubricant film in which the components are uniformly mixed is heated to a temperature equal to or higher than the melting point of the paraffin wax to be used, and the paraffin wax is liquefied to form a base oil. And the liquefied paraffin wax may be mixed and cooled.
- This temperature increase may be carried out in a storage container before application, or it is applied to a screw joint in a mixed state, and then the surface application is heated with a heater or the like to be dissolved and then cooled. May be.
- a lubricating film in which paraffin wax is distributed in a substantially uniform concentration in the film is formed.
- the composition for forming a lubricating film of the present embodiment can be a two-component composition comprising a mixture of components other than paraffin wax as a drying agent and paraffin wax.
- a coating is formed by applying a mixture other than paraffin wax.
- the formed film is sticky.
- the upper layer of the coating increases the paraffin wax concentration. That is, a lubricating coating in which the paraffin wax concentration changes in the thickness direction of the coating is obtained, and the stickiness resistance is further improved.
- the composition for forming a lubricating coating of the present embodiment is applied to the surface of at least one fitting portion of the pin 1 and the box 2 in the threaded joint for steel pipes.
- the pin 1 and the box 2 of the threaded joint for steel pipes have the threaded portions 3 and 4 and the unthreaded metal contact portion 5 as fitting portions, respectively.
- Steel threaded joints are typically shipped in the state shown in FIG. That is, the product is shipped in a state in which a coupling B in which a box 2 having an internal thread portion 4 is formed on an inner surface is fastened in advance to one pin 1 of an oil well pipe A in which pins 1 having an external thread portion 3 are formed at both ends. .
- unthreaded metal contacts are omitted to simplify the drawing.
- the structure of the threaded joint for steel pipes is not limited to the structure shown in FIG.
- An integral type threaded joint for steel pipes in which a pin 1 having a male thread portion 3 is formed on the outer surface of one end of the oil well pipe and a box 2 having a female thread portion 4 is formed on the inner surface of the other end is also used.
- the coupling B is unnecessary for fastening. It is also possible to form the box 2 on the oil well A and the pin 1 on the coupling B.
- FIG. 2 is an explanatory view schematically showing a cross section of a tightening portion of the threaded joint for steel pipes of FIG.
- the fitting parts of the threaded joint for steel pipe are the male thread part 3 and the female thread part 4 and the unthreaded metal contact part 5.
- the lubricating film forming composition is applied to at least one of the fitting portions of the pin 1 and the box 2 (that is, the screw portion 3 or 4 and the unthreaded metal contact portion 5) to form a grease-like semi-solid.
- a lubricating coating is formed.
- the pin 1 and the box 2 have a shape that fits each other. However, when observed minutely, as shown in FIG. 3, there is a very small amount between the male screw portion 3 of the pin 1 and the female screw portion 4 of the box 2. There is a gap 6. A slightly larger gap 6 is also provided between the screwless metal contact portion 5 and the screw portion 3. Without such a gap 6, the tightening operation is substantially impossible. Lubricating components accumulate in the gap 6 and ooze out to the surroundings by the pressure during tightening, so that seizure is prevented and the gap 6 contributes to lubrication. Since the lubricating film formed from the composition for forming a lubricating film of this embodiment is semi-solid like the film of compound grease, it can be leached out, and provides excellent lubricity and airtightness.
- composition for forming a lubricating film of the present embodiment is excellent in rust resistance as well as compound grease, the composition for forming a lubricating film was applied even after being shipped in the state shown in FIG. The fitting portion can be protected from rusting.
- the composition for forming a lubricant film needs to be applied in an amount necessary to fill the minute gap 6 in the fitting portion such as between the threads shown in FIG. If the coating amount is small, it will not be possible to expect an action in which the oil agent oozes out on the friction surface due to the hydrostatic pressure generated at the time of tightening or an action in which the lubricity imparting component wraps around from other gaps. Therefore, the thickness of the lubricating coating is preferably 10 ⁇ m or more.
- the lubricating coating is only one of the fitting portions of the pin 1 and the box 2 in order to ensure lubricity. It is enough to process. However, in order to ensure rust prevention, it is necessary to form a lubricating film on the fitting portion of both the pin 1 and the box 2. Since the minimum film thickness required for the rust prevention is also 10 ⁇ m, it is preferable to form a lubricating film with a thickness of 10 ⁇ m or more on both fitting portions. However, as shown in FIG.
- the lubricating film formed from the lubricating film forming composition of this embodiment has high lubricity, it is not necessary to make the lubricating film thicker than necessary. If the thickness is too large, not only is the material wasted, but it also goes against the prevention of environmental pollution, which is one of the purposes of this embodiment. Therefore, the upper limit of the film thickness is not particularly defined, but is preferably about 200 ⁇ m. A more preferable film thickness of the lubricating coating is 30 to 150 ⁇ m. However, as will be described below, when it is desired to increase the surface roughness of the fitting portion to be applied, it is preferable that the thickness of the lubricating coating be larger than the surface roughness Rmax of the fitting surface. When the surface roughness is present, the thickness of the lubricating coating is an intermediate value between the maximum and minimum portions of the film thickness.
- the composition for forming a lubricating coating of the present embodiment may contain a dissolving base in order to facilitate application.
- the composition itself is not semi-solid, but can be made into a liquid having excellent coating properties.
- the dissolved base generally has volatility, so that the dissolved base is evaporated and removed from the formed lubricating coating, resulting in a semi-solid lubricating coating. become.
- a general organic solvent can be used as the dissolving base
- examples of the dissolving base suitable for use in the present embodiment include petroleum solvents such as mineral spirits.
- an appropriate method may be selected according to the properties of the composition for forming a lubricating film of the present embodiment.
- the composition for forming a lubricating coating contains a dissolving base and is liquid at room temperature
- general coating methods such as spray coating, dipping, and brush coating can be employed.
- a coating apparatus equipped with a heating mechanism for example, a spray gun for hot melt coating
- Application can be performed in a state in which paraffin wax as a drying agent is melted.
- a pre-heated composition for forming a lubricating film is applied to a preheated fitting part from a spray gun with a heat retaining device capable of maintaining a constant temperature. It is preferable to do.
- a surface roughness of 3 to 5 ⁇ m is obtained by cutting. It is done. If this surface roughness is increased by an appropriate method, the lubricity is further improved. This is because the oil agent confined in the minute unevenness of the surface roughness has the effect that the oil agent oozes out to the friction surface by the hydrostatic pressure action of the fitting portion described above and the effect that the lubricity imparting component wraps around from other gaps. This is because it occurs.
- the surface roughness preferable for improving the lubricity is 5 to 40 ⁇ m in Rmax. If the surface roughness exceeds 40 ⁇ m in Rmax, the periphery of the recess cannot be sufficiently sealed, and hydrostatic pressure action does not occur and sufficient lubricity cannot be obtained.
- a more preferable range of Rmax is in the range of 10 to 30 ⁇ m.
- ⁇ Roughness application method> The method for imparting the surface roughness is not particularly defined, but the following methods can be mentioned.
- Projection of sand or grid The surface roughness can be changed according to the size of the abrasive grains to be projected.
- Corrosion by acid A method of immersing in a strong acid solution such as sulfuric acid, hydrochloric acid, nitric acid or hydrofluoric acid.
- Phosphate treatment coating treatment with manganese phosphate, zinc phosphate, iron manganese phosphate, zinc calcium phosphate, etc. (the roughness of the crystal surface increases with the growth of the crystals produced).
- Electroplating copper plating, iron plating (because the convex portions are preferentially plated, the surface is rough but rough). As described above, copper plating may be applied for the purpose of improving the lubricity of a threaded joint for steel pipes.
- Dry impact plating A method in which particles, such as zinc blast and zinc-iron alloy blast, coated with a plating material on an iron core are projected using centrifugal force or air pressure to be plated.
- the methods (3) to (5) are methods for forming a base coating film having a large surface roughness, when the oil film is cut, the coating prevents the metal-to-metal contact. It is preferable at the point which the improvement of rust prevention property is acquired simultaneously.
- the manganese phosphate coating is more suitable because the surface particles are rough and the oil retaining property of the oil agent is good.
- the material of the oil well A it may not be phosphating because it is a high alloy. In such a case, after performing the iron plating shown in the above (4), phosphating can be performed.
- the thickness of the undercoat film it is preferable that the thickness of the undercoat film is larger than the surface roughness imparted thereby, because the retention of the oil agent and the adhesion of the undercoat film are improved. . Therefore, the film thickness of the base treatment film is preferably 5 to 40 ⁇ m.
- Lubricating film forming compositions of Examples 1 to 6 and Comparative Examples 1 to 9 as shown in Table 1 were prepared. % Is mass% as described above. Among the components used, paraffin wax was Paraffin Wax 155 manufactured by Nippon Seiwa Co., Ltd., Ca sulfonate was Calcinate (registered trademark) C-400W manufactured by Chemtura, and petrolatum wax was OX-1749 manufactured by Nippon Seiwa Co., Ltd. It was. Other ingredients were industrial chemicals.
- the commercially available compound grease of Comparative Example 2 was Type 3 manufactured by Showa Shell Sekiyu KK, and the commercially available biodegradable grease of Comparative Example 3 was Biotemp PL manufactured by Kyodo Yushi Co., Ltd.
- the mineral oil of Example 6 and Comparative Example 9 was a refined mineral oil raw material (viscosity grade: VG32) manufactured by Idemitsu Kosan Co., Ltd., and the graphite was AGB-5 manufactured by Ito Graphite Industries Co., Ltd.
- lubricating film forming compositions were applied to the surface of a substrate suitable for each performance test to form a lubricating film. Application was performed by brushing. The formed lubricant film was examined for biodegradability, lubricity, rust prevention, stickiness resistance, and corrosiveness to copper by the following methods. The test results are summarized in Table 2.
- the biodegradability of the composition for forming a lubricant film was evaluated by the OECD301D Closed Bottle method, which is generally adopted as a method for evaluating biodegradability, for the purpose of evaluating the environmental impact on the ocean. Specifically, for each component in the composition, the biodegradability (BOD 28 ) after 28 days in water was measured according to the above test method, and the BOD 28 of the entire composition taking into account the blending ratio of the corresponding component. The value was determined. ⁇ where BOD 28 values thus obtained composition is less than 20%, the case of less than 20% ⁇ 60% ⁇ , the case of less than 60% ⁇ 80% ⁇ , the case of more than 80% Evaluated as. The acceptance is ⁇ and ⁇ with a BOD 28 value of 60% or more.
- the lubricity was evaluated by a friction test simulating the tightening / loosening of a threaded joint for steel pipes shown in FIG.
- a friction test simulating the tightening / loosening of a threaded joint for steel pipes shown in FIG.
- a cylindrical test piece (Pin, pin) was pressed from above while rotating a conical test piece (Disk, equivalent to a box) coated with a lubricating coating to be tested.
- the load was increased from 1.0 ton in increments of 0.1 ton, and the lubricity was evaluated by the maximum load at which seizure did not occur (hereinafter referred to as “OK load”).
- Lubricant means a lubricating coating.
- the test conditions for this friction test are as follows. Contact method: Line contact of cylinder (pin) and cone (disk); Material: Nippon Steel & Sumitomo Metal Co., Ltd. SM95TS (low alloy carbon steel for threaded joints); Surface treatment: Manganese phosphate treatment only on the disk surface; Lubricant coating: formed by applying a composition for forming a lubricating coating to be tested by brushing on the manganese phosphate coating on the disk surface: the coating thickness is 50 ⁇ m; Test load: 5 tons maximum; Disk rotation speed: 20 rpm.
- the case where the OK load is less than 2.0 tons the case where the load is not less than 2.0 tons and less than 3.0 tons, the case where the load is not less than 3.0 tons and less than 4.0 tons, and The case of 0 tons or more was marked as ⁇ . ⁇ and ⁇ with an OK load of 3.0 tons or more are acceptable.
- the case where the amount of powder adhering after air blowing is 5 g or more is ⁇
- the case where it is 2.5 g or more to less than 5 g is ⁇
- the case where it is 1 g or more to less than 2.5 g is ⁇
- the case where it is less than 1 g is ⁇ .
- This amount is less than 2.5 g, and ⁇ and ⁇ are acceptable.
- the amount of adhesion is less than 2.5 g that passes in this test, even in the film formed on the actual pipe, the adhered foreign matter is similarly removed by a general air blow (static pressure 10 kPa, flow rate 2.0 m 3). / Min).
- the corrosiveness to copper is determined by applying a lubricating film forming composition to be tested to a pure copper plate to form a lubricating film having a thickness of 50 ⁇ m, exposing the copper plate to the atmosphere at 80 ° C. for 2 hours, and then allowing to stand at room temperature for 4 weeks. did. Corrosion to copper was evaluated by discoloration of the copper plate after standing for 4 weeks. In the evaluation, a case where there was a slight discoloration was evaluated as x, a case where no discoloration was observed was evaluated as ⁇ , and a case where discoloration was not observed was acceptable.
- the lubricant film formed from the composition for forming a lubricant film according to the present embodiment has all test items for biodegradability, lubricity, rust resistance, stickiness resistance, and corrosiveness to copper. The performance which passed in was shown. On the other hand, the comparative example showed inadequate results for any of the test items.
- a lubricating film forming composition excellent in lubricity, rust prevention, biodegradability, stickiness resistance, and corrosion resistance to copper, and a threaded joint for steel pipes having the lubricating film forming composition, Can be provided.
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Abstract
Description
本願は、2013年9月2日に、日本に出願された特願2013-181623号に基づき優先権を主張し、その内容をここに援用する。
生分解性を考慮したグリス(一般に生分解性グリスと呼ばれる)も知られている。しかし、従来の生分解性グリスは軸受けの潤滑などを目的として設計されているので、鋼管用ねじ継手の締結時にみられる厳しい摺動に対しては潤滑性が不足し、使用現場などでの暴露に対する防錆性も不足している。
また、鋼管用ねじ継手には、締結時の焼き付き防止のために銅めっきを施す場合があるが、従来の生分解性グリスに含まれる潤滑皮膜成分は銅を腐食しやすいという問題があった。
(1)本発明の一態様に係る潤滑被膜形成用組成物は、組成として:ペンタエリスリトール脂肪酸エステルおよびトリメチロールプロパン脂肪酸エステルから選ばれた1種以上からなる基油40~80質量%と;パラフィンワックスからなるドライ化剤5~20質量%と;ヒドロキシステアリン酸のアルカリ金属塩およびアルカリ土類金属塩から選ばれた1種以上からなる固体潤滑剤10~40質量%と;を含有する。前記基油、前記ドライ化剤、および前記固体潤滑剤の合計含有量が85質量%以上100質量%以下であり、重金属を含まない。
海洋への環境影響を評価するために、海水中での生分解性の評価方法として一般に採用されている下記の何れかの方法のうち、その試験体の評価に応じて、適切な方法を採用する。
(b) Modified seawater variant of ISO TC/147, SC5/WG4 N141 1990: BOD test for insoluble substances.
上記のいずれの試験方法においても、試験結果は、通常は溶存酸素の減少量に基づき、パーセントで表示され(例、BOD=15%)、その値が高いほど、生分解性が良く、環境への影響が小さい。
従来のセミドライ被膜では、塩基性スルホネート、塩基性サリシレート、塩基性フェネートおよび塩基性カルボキシレートが、潤滑油成分として使用されている。これらの化合物の潤滑性は非常に高い。
JIS Z2371に規定される塩水噴霧試験により防錆性を評価したところ、従来のセミドライ被膜で使用される潤滑油成分である、塩基性スルホネート、塩基性サリシレート、塩基性フェネートおよび塩基性カルボキシレートは防錆性にも優れる。
上記の多価アルコール脂肪酸エステルの多くも防錆性はよくないが、そのなかでは、ペンタエリスリトールの脂肪酸エステル、トリメチロールプロパンの脂肪酸エステルの防錆性が高いことが判明した。多くの多価アルコール脂肪酸エステルでは、脂肪酸エステルが加水分解して、水分を透過しやすい状態になるので、防錆性が低下する。しかしながら、ペンタエリスリトールの脂肪酸エステル、トリメチロールプロパンの脂肪酸エステルは耐加水分解性が高い、つまり耐水性が高いため、防錆性が高いと考えられる。
油井管のリグでの締結においては、油井管を直立させる際に、管内面に付着している錆または、錆を除去するために投入したブラスト砥粒などが落下し、錆またはブラスト砥粒がねじ部やねじ無し金属接触部に付着した状態で、ピンとボックスとの締付けが行われることがある。このため、ねじ部の表面に塗布された潤滑被膜は異物が付着しないようベトツキを生じないことが求められる。
鋼管用ねじ継手には、締結時の焼き付き防止のために銅めっきを施す場合がある。この場合、潤滑被膜成分によって活性の高い銅が腐食する可能性がある。生分解性グリスや生分解性の高い多価アルコール脂肪酸エステルは銅に対する腐食性が高い傾向にある。しかし、ペンタエリスリトールの脂肪酸エステルやトリメチロールプロパンの脂肪酸エステルは、銅に対する腐食性が低いことが判明した。これは、脂肪酸エステルによる銅の腐食は、まず脂肪酸エステルが加水分解して、分解した脂肪酸が銅と反応して脂肪酸銅を形成することによって腐食が進行するためである。従って、前述のように耐加水分解性が高い、ペンタエリスリトールの脂肪酸エステルやトリメチロールプロパンの脂肪酸エステルは、銅に対する腐食性も低い。
最初に、本実施形態の潤滑被膜形成用組成物を構成する各成分について説明する。
本実施形態の組成物においては、潤滑性向上成分の主剤である基油として、次式1で示されるペンタエリスリトールの脂肪酸エステルおよびトリメチロールプロパンの脂肪酸エステルが使用できる。
一方、R基の炭素数が長すぎると逆に分子内の極性比率が低くなりすぎ、水性成分の混合性あるいは分散性が悪くなる。また、R基の炭素数が長すぎると基油の粘度が高くなりすぎ、他の成分の配合が困難になることがあり、また塗布が極端に難しくなることがある。更には、R基の炭素数が長すぎると、被膜の粘度が高くなりすぎて自己補修機能が低下し潤滑性が悪くなる。
以上の理由により、R基の炭素数は3~20の範囲内でよく、好ましくは12~18であり、より好ましくは16~18であり、最も好ましくは17である。
基油は極性基の部分でねじ表面に配向吸着して吸着層を形成すると考えられる。このとき、オレイン酸のように二重結合があるとR基の二重結合部で動きが拘束されるため、荷重に対する耐力が高く、かつ水の侵入を阻止できる。また、イソステアリン酸は炭素鎖が2つに分かれているため、1つ1つの炭素鎖は短いが、その分、吸着したとき密に配向するため荷重に対する耐力が高く、かつ水の侵入も阻止できる。
これらにより基油の脂肪酸部はオレイン酸あるいはイソステアリン酸が良好と考えられる。なお、理由は定かではないが、イソステアリン酸とペンタエリスリトールとの組み合わせでは配向吸着する際に立体的な問題があり、イソステアリン酸とトリメチロールプロパンとの組み合わせに比べ劣るのではないかと推測される。
ペンタエリスリトールとオレイン酸とを組み合わせることによりペンタエリスリトールテトラオレエートが得られる。トリメチルプロパンとオレイン酸とを組み合わせることにより、トリメチロールプロパントリオレエートが得られる。トリメチルプロパンとイソステアリン酸とを組み合わせることにより、トリメチロールプロパントリイソステアレートが得られる。
本実施形態の潤滑被膜形成用組成物は、被膜の耐ベトツキ性を高めるための化合物として、パラフィンワックスを含有する。ドライ化させるだけであれば他のワックス類も使用できるが、生分解性及びドライ化性能を考慮すると、パラフィンワックスが好適である。本実施形態で使用するパラフィンワックスとして好ましいのは、融点が45℃以上60℃以下のパラフィンワックスである。その形態は、後述するように粉末であることが好ましい。
本実施形態の潤滑被膜形成用組成物には、潤滑性を向上させるための補助的な化合物として、生分解性の高い固体潤滑剤を添加する。この固体潤滑剤としては、ヒドロキシステアリン酸のアルカリ金属塩あるいはアルカリ土類金属塩を使用する。中でもヒドロキシステアリン酸カルシウム、ヒドロキシステアリン酸リチウム、およびヒドロキシステアリン酸ナトリウムが好ましい。これらの固体潤滑剤は石鹸類であり、油中でもせん断に対して変形しながら潤滑性を発揮すると同時に、基油の脂肪酸部分をヒドロキシ化することによって生分解性を高めていると考えられる。
本実施形態の潤滑被膜形成用組成物は、潤滑性、防錆性その他の性能の向上を目的として、上記の基油、ドライ化剤、固体潤滑剤に加えて、少量であれば他の成分を添加しても良い。潤滑被膜としての混合物の生分解度は、個々の成分の生分解度と質量分率の関係において加成性が成立するので、組成物全体の生分解性が60%を下回らない範囲において他の成分を添加しても良い。
他の成分を添加することにより、本実施形態の潤滑被膜形成用組成物中における上記の基油、ドライ化剤、固体潤滑剤の合計含有率が、全組成物中の85質量%を下回る場合には、組成物全体の生分解性が60%を下回ってしまう可能性がある。そのため、本実施形態の潤滑被膜形成用組成物中における上記の基油、ドライ化剤、固体潤滑剤の合計含有量は、全組成物中の85質量%以上100質量%以下とすることが必要である。
なお、組成物全体の生分解性とは、組成物を構成する各成分の割合を加味した生分解性の値、すなわち、成分ごとにその生分解性の値にその含有率を乗じた積を求め、全成分の積の総和として求められる。
ただし、本実施形態の潤滑被膜形成用組成物が重金属を含むと、洗浄時に重金属が周囲に流出し、環境汚染を引き起こしてしまう。そのため、本実施形態の潤滑被膜形成用組成物は重金属を含まない。
本実施形態の潤滑被膜形成用組成物は、少なくとも上記の基油、ドライ化剤、および固体潤滑剤を含有する。これらの成分の含有量は、潤滑被膜形成用組成物全体(100%)に対して、基油が40~80質量%、ドライ化剤が5~20質量%、固体潤滑剤が10~40質量%の範囲内とすることが好ましい。より好ましくは、潤滑被膜形成用組成物全体(100%)に対して、基油40~65質量%、ドライ化剤5~10質量%、固体潤滑剤10~25質量%である。
本実施形態の潤滑被膜形成用組成物は、上記の基油、ドライ化剤、固体潤滑剤を単純に混合し、良く撹拌して均一化することによって得られる。この場合、ドライ化剤(パラフィンワックス)は粉末化した状態で供給することが好ましい。また、この粉末の粒径は、後述する被膜化した時の膜厚より小さいことが好ましい。固体潤滑剤の粒径も同様である。
また、上記の基油、ドライ化剤、固体潤滑剤に加え、他の成分を混合する際には、その成分の性質に応じて公知の混合方法を用いればよい。
本実施形態の潤滑被膜形成用組成物は、鋼管用ねじ継手におけるピン1とボックス2との少なくとも一方の嵌合部表面に塗布される。ここで、鋼管用ねじ継手のピン1及びボックス2は、それぞれ嵌合部としてねじ部3,4及びねじ無し金属接触部5をそれぞれ有する。
組立の不具合に伴う鋼管用ねじ継手の偏芯、傾き、異物の混入などにより、鋼管用ねじ継手を締結する際に、局部的に面圧が過大となり、塑性変形を伴う場合がある。鋼管用ねじ継手に潤滑被膜を形成する目的は、このような過酷な潤滑条件下でも、焼付きを防止することである。そのためには、潤滑性付与成分の摩擦面への導入および維持が不可欠となる。
本実施形態の潤滑被膜形成用組成物で被膜処理した鋼管用ねじ継手の、ねじ部3,4やねじ無し金属接触部5といった嵌合部では、切削加工によって3~5μmの表面粗さが得られる。この表面粗さを適当な方法でより大きくすると、潤滑性がさらに向上する。これは、表面粗さの微小な凹凸に閉じ込められた油剤により、前述した嵌合部の静水圧作用で摩擦面に油剤が浸み出す作用、および他の隙間から潤滑性付与成分が回り込む作用が発生するためである。この作用は、表面粗さを付与する方法に関係なく表面粗さに依存して得られる。潤滑性の向上に好ましい表面粗さはRmaxで5~40μmである。表面粗さがRmaxで40μmを越えると、凹部の周囲が十分に密封できなくなり、静水圧作用が発生しなくなって十分な潤滑性が得られなくなる。Rmaxのより好ましい範囲は10~30μmの範囲である。
表面粗さの付与方法は特に規定しないが、次のような方法が挙げられる。
(1)サンドあるいはグリッドの投射:投射する砥粒の大きさにより表面粗さを変更できる。
(2)酸による腐食:硫酸、塩酸、硝酸、フッ酸などの強酸液に浸漬する方法。
(3)リン酸塩処理:リン酸マンガン、リン酸亜鉛、リン酸鉄マンガン、リン酸亜鉛カルシウムなどの被膜処理(生成される結晶の成長に伴い結晶表面の粗さが増す)。
(4)電気めっき:銅めっき、鉄めっき(凸部が優先してめっきされるため、僅かであるが表面が粗くなる)。銅めっきは前述したように、鋼管用ねじ継手の潤滑性を向上させる目的で施されることがある。
(5)乾式衝撃めっき:亜鉛ブラスト、亜鉛-鉄合金ブラストなど鉄芯にめっき材を被覆した粒子を遠心力あるいはエアー圧を利用して投射しめっきする方法。
比較例2の市販コンパウンドグリスは昭和シェル石油(株)製のType3であり、比較例3の市販生分解性グリスは協同油脂(株)製バイオテンプPLであった。
実施例6及び比較例9の鉱物油は出光興産(株)製の精製鉱物油原料(粘度グレード:VG32)であり、黒鉛は伊藤黒鉛工業(株)製のAGB-5であった。
潤滑被膜形成用組成物の生分解性は、海洋への環境影響を評価するという目的から、生分解性の評価方法として一般的に採用されているOECD301D Closed Bottle法により評価した。具体的には、組成物中の各成分について、水中での28日経過後の生分解性(BOD28)を上記試験法に従って測定し、該当成分の配合割合を加味した組成物全体のBOD28の値を求めた。こうして得られた組成物のBOD28値が20%未満である場合を×、20%以上~60%未満の場合を△、60%以上~80%未満の場合を○、80%以上の場合を◎と評価した。合格は、BOD28値が60%以上である○と◎である。
潤滑性は、図4に示す鋼管用ねじ継手の締付け/緩め戻しを模擬した摩擦試験により評価した。試験は、まず、試験する潤滑被膜を表面に塗布した円錐形試験片(Disk、ボックスに相当)を回転させながら、上から円筒試験片(Pin、ピン)を押し当てた。荷重を1.0トンから0.1トン刻みで増大させていき、焼付きが発生しない最大の荷重(以下、OK荷重)により潤滑性を評価した。図4中、Lubricantは潤滑被膜を意味する。
接触方式:円筒(ピン)と円錐(ディスク)の線接触;
材質:新日鐡住金(株)製SM95TS(ねじ継手用低合金炭素鋼);
表面処理:ディスク表面のみリン酸マンガン処理;
潤滑被膜:ディスク表面のリン酸マンガン被膜上に刷毛塗りにより試験する潤滑被膜形成用組成物を塗布することにより形成:被膜厚みは50μm;
試験荷重:最大5トン;
ディスクの回転速度:20rpm。
防錆性の評価はJIS Z2371に規定される塩水噴霧試験(防錆試験)により実施した。上記摩擦試験と同一材質の鋼板(50mm×100mm、厚さ2mm)の表面処理を施していない研削後の表面に、潤滑被膜を30μm厚さで形成して、試験片として使用した。塗布は刷毛塗りにより行った。塩水噴霧試験は500時間行い、錆の発生の有無を確認した。評価は500時間の試験後に僅かでも錆が発生した場合を×、錆が発生しなかった場合を○とした。錆が発生しなかった○が合格である。
耐ベトツキ性の評価は、図5に示す異物付着性試験(ベトツキ試験)により実施した。研削後の炭素鋼製試験片(50×50mm)の片面に、試験する潤滑被膜形成用組成物を刷毛塗りにより塗布して潤滑被膜を形成した。この潤滑被膜面を下に向けて、粉末(4号珪砂)を敷き詰めたシャーレ上に30秒間静置し、この静置前後の試験片の重量差から粉末の付着量を求めた。さらに、試験片を直立させ、粉末が付着した潤滑被膜に向けて150mm離れた距離から0.4MPaのエアーブローを10秒間当てた。このエアーブロー後に残存する粉末付着量を重量差から求めた。
なお、本試験で合格となる付着量2.5g未満であれば、実パイプに成膜された被膜においても、同様に付着した異物を一般的なエアーブロー(静圧10kPa、流量2.0m3/min)で除去できることを確認している。
銅に対する腐食性は、試験する潤滑被膜形成用組成物を純銅板に塗布して厚み50μmの潤滑被膜を形成し、この銅板を80℃の大気中に2時間曝した後、常温で4週間放置した。4週間の放置後の銅板の変色により銅に対する腐食性を評価した。評価は、僅かでも変色があった場合を×、変色が認められなかった場合を○とし、変色が認められなかった○が合格である。
一方、比較例は、いずれかの試験項目で不十分な結果を示していた。
2 ボックス
3 雄ねじ
4 雌ねじ
5 ねじ無し金属接触部
6 ねじ山間など接触部の微小隙間
A 油井管
B カップリング
Claims (4)
- 組成として:
ペンタエリスリトール脂肪酸エステルおよびトリメチロールプロパン脂肪酸エステルから選ばれた1種以上からなる基油40~80質量%と;
パラフィンワックスからなるドライ化剤5~20質量%と;
ヒドロキシステアリン酸のアルカリ金属塩およびアルカリ土類金属塩から選ばれた1種以上からなる固体潤滑剤10~40質量%と;
を含有し、
前記基油、前記ドライ化剤、および前記固体潤滑剤の合計含有量が85質量%以上100質量%以下であり、
重金属を含まない、
ことを特徴とする、潤滑被膜形成用組成物。 - 前記基油が、ペンタエリスリトールテトラオレエート、トリメチロールプロパントリオレエートおよびトリメチロールプロパントリイソステアレートから選ばれる1種以上からなることを特徴とする請求項1に記載の潤滑被膜形成用組成物。
- 前記固体潤滑剤が、ヒドロキシステアリン酸カルシウム、ヒドロキシステアリン酸リチウム、およびヒドロキシステアリン酸ナトリウムから選ばれる1種以上からなることを特徴とする請求項1または2に記載の潤滑被膜形成用組成物。
- 嵌合部としてねじ部とねじ無し金属接触部とをそれぞれ有するピン及びボックスから構成される鋼管用ねじ継手であって、前記ピンと前記ボックスの少なくとも一方の前記嵌合部の表面に、請求項1~3のいずれか1項に記載の潤滑被膜形成用組成物から形成された潤滑被膜を有することを特徴とする、鋼管用ねじ継手。
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NO14839947A NO3042945T3 (ja) | 2013-09-02 | 2014-09-02 | |
CA2922387A CA2922387C (en) | 2013-09-02 | 2014-09-02 | Lubricant film-forming composition and screw joint for steel pipe |
RU2016107388A RU2627704C1 (ru) | 2013-09-02 | 2014-09-02 | Смазочная пленкообразующая композиция и резьбовое соединение для стальных труб |
EP14839947.0A EP3042945B1 (en) | 2013-09-02 | 2014-09-02 | Composition for forming lubricating coating film, and threaded joint for steel pipe |
JP2015534368A JP6025994B2 (ja) | 2013-09-02 | 2014-09-02 | 潤滑被膜形成用組成物及び鋼管用ねじ継手 |
MX2016002519A MX2016002519A (es) | 2013-09-02 | 2014-09-02 | Composicion para formar pelicula de revestimiento lubricante y junta roscada para tuberia de acero. |
US14/915,059 US9725671B2 (en) | 2013-09-02 | 2014-09-02 | Lubricant film-forming composition and screw joint for steel pipe |
CN201480047758.9A CN105492585B (zh) | 2013-09-02 | 2014-09-02 | 润滑被膜形成用组合物及钢管用螺纹接头 |
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EP (1) | EP3042945B1 (ja) |
JP (1) | JP6025994B2 (ja) |
CN (1) | CN105492585B (ja) |
CA (1) | CA2922387C (ja) |
MX (1) | MX2016002519A (ja) |
NO (1) | NO3042945T3 (ja) |
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WO2021039363A1 (ja) * | 2019-08-30 | 2021-03-04 | 日本グリース株式会社 | ワイヤロープ |
WO2022255166A1 (ja) * | 2021-05-31 | 2022-12-08 | Jfeスチール株式会社 | 固体潤滑被膜形成用の薬剤、油井管、及び油井管ねじ継手 |
WO2024043133A1 (ja) * | 2022-08-25 | 2024-02-29 | Jfeスチール株式会社 | 油井管、油井管ねじ継手、及び塗料 |
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UA112576C2 (uk) * | 2012-06-07 | 2016-09-26 | Ніппон Стіл Енд Сумітомо Метал Корпорейшн | Нарізне з'єднання для сталевої труби |
CN109002569A (zh) * | 2018-01-12 | 2018-12-14 | 哈尔滨理工大学 | 一种建立静压油膜运动层边界条件的方法 |
JP7348894B2 (ja) * | 2018-03-06 | 2023-09-21 | 日本グリース株式会社 | グリース組成物 |
CN111394164B (zh) * | 2020-04-30 | 2022-04-08 | 杭州得润宝油脂股份有限公司 | 一种真空密封润滑脂及其制备方法 |
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Also Published As
Publication number | Publication date |
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NO3042945T3 (ja) | 2018-07-21 |
JP6025994B2 (ja) | 2016-11-16 |
RU2627704C1 (ru) | 2017-08-10 |
EP3042945A1 (en) | 2016-07-13 |
CA2922387C (en) | 2017-09-26 |
CN105492585A (zh) | 2016-04-13 |
US20160208194A1 (en) | 2016-07-21 |
MX2016002519A (es) | 2016-06-16 |
CN105492585B (zh) | 2018-08-03 |
EP3042945A4 (en) | 2017-04-26 |
US9725671B2 (en) | 2017-08-08 |
CA2922387A1 (en) | 2015-03-05 |
EP3042945B1 (en) | 2018-02-21 |
JPWO2015030252A1 (ja) | 2017-03-02 |
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