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WO2016021690A1 - Tail seal composition for use in shield machine - Google Patents

Tail seal composition for use in shield machine Download PDF

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Publication number
WO2016021690A1
WO2016021690A1 PCT/JP2015/072377 JP2015072377W WO2016021690A1 WO 2016021690 A1 WO2016021690 A1 WO 2016021690A1 JP 2015072377 W JP2015072377 W JP 2015072377W WO 2016021690 A1 WO2016021690 A1 WO 2016021690A1
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WO
WIPO (PCT)
Prior art keywords
tail seal
shield machine
seal composition
fibers
oil
Prior art date
Application number
PCT/JP2015/072377
Other languages
French (fr)
Japanese (ja)
Inventor
荒井　孝
泰葉 徳毛
Original Assignee
Ｊｘ日鉱日石エネルギー株式会社
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Filing date
Publication date
Application filed by Ｊｘ日鉱日石エネルギー株式会社 filed Critical Ｊｘ日鉱日石エネルギー株式会社
Priority to JP2016540741A priority Critical patent/JP6574776B2/en
Publication of WO2016021690A1 publication Critical patent/WO2016021690A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
    • C09K8/34—Organic liquids
    • 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
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
    • C10M101/02—Petroleum fractions
    • 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
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • C10M107/08—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation containing butene
    • 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/10—Metal oxides, hydroxides, carbonates or bicarbonates
    • 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
    • C10M125/30—Clay
    • 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
    • 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
    • C10M169/04—Mixtures of base-materials and additives
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining

Definitions

  • the present invention relates to a tail seal composition for a shield machine.
  • the shield machine When excavating a tunnel into the ground with a shield machine, the shield machine advances while excavating ground in the direction of travel, and segments behind the shield machine are sequentially assembled as the inner wall of the tunnel. ing.
  • the outer diameter of the tunnel to be excavated (excavation opening diameter) is the outer diameter of the shield machine, but since the segment is assembled inside the shield machine, the outer diameter of the segment is less than the inner diameter of the shield machine. Become. For this reason, a gap is formed between the outer diameter of the tunnel and the outer diameter of the segment behind the shield machine, and this gap is filled with a backing agent as the shield machine advances.
  • tail seal compositions with sufficiently high water-stopping properties have high viscosities, which may make it difficult to pump and cause problems such as interruption of excavation by a shield machine.
  • a tail seal composition that can be easily pumped has a concern about water-stopping.
  • the present invention solves such problems, and provides a tail seal composition having high water-stopping properties and excellent pumpability.
  • the present inventors have surprisingly found that the use of a mixture of a predetermined ratio of mineral oil and polybutene as the lubricating base oil of the tail seal composition makes the fiber moderate. It has been found that the water-stopping property and the pumping property, which are problems that are contradictory to each other, can be remarkably improved at the same time, and that the water-stopping property and the pumping property can be further improved in a balanced manner by using a predetermined combination of fibers. .
  • the present invention has been made based on such knowledge and is as follows.
  • (2) The average length of the short fibers is 0.8 to 2.4 mm, and the average length of the long fibers is 1.5 to 10 times the average length of the short fibers contained.
  • the tail seal composition for a shield machine according to the present invention can simultaneously improve the water-stopping property and the pumpability, it is possible to perform excavation with a shield machine efficiently and safely.
  • the tail seal composition for a shield machine contains 15 to 60% by mass of a lubricating base oil, 30 to 70% by mass of inorganic powder, and 2 to 10% by mass of fiber.
  • it has a density of 1.1 to 1.8 g / cm 3 at 15 ° C. because of ease of pumping, water-stopping, stability when mixed with water, and oil retention at high temperatures. ⁇ 1.5 g / cm 3 is more preferred, and 1.1 to 1.3 g / cm 3 is even more preferred.
  • those having an immiscibility consistency of 150 to 350 are preferred, and 220 to 280 is more preferred.
  • the measurement of the immiscible penetration referred to in the present invention is based on a method based on JISK2220.
  • the tail seal composition for a shield machine of the present invention is substantially free of moisture.
  • the fact that it does not substantially contain water means that it does not exclude water inevitably mixed in, but the water content is preferably 5% by mass or less based on the total amount of the tail seal composition, More preferably, it is 1 mass% or less.
  • the lubricating base oil of the present invention contains mineral oil and polybutene in a mass ratio of 20: 1 to 1: 1. It is presumed that the adhesiveness of polybutene to the fiber, the fluidity of mineral oil, and the affinity of both improve the pumpability and water stoppage at the same time. When the content ratio of the mineral oil and polybutene is outside the above range, these effects are lowered.
  • the content ratio of mineral oil and polybutene is preferably 10: 1 to 2: 1, and more preferably 5: 1 to 3: 1.
  • the physical properties of the lubricating base oil are preferably those having a kinematic viscosity at 40 ° C.
  • the pour point is preferably ⁇ 10 ° C. or lower, and the flash point is preferably 150 ° C. or higher from the viewpoint of safety.
  • the content of the lubricating base oil is 15 to 60% by mass, preferably 25 to 58% by mass, more preferably 35 to 57% by mass, based on the total amount of the tail seal composition.
  • the mineral oil used as the lubricating base oil can be a commercially available mineral oil-based lubricating oil or a mineral oil-based lubricating base oil that is a base oil. These are usually obtained by subjecting a distillate obtained by subjecting crude oil to atmospheric distillation, or further distilling the distillation residue under reduced pressure, as a base oil as a base oil, Alternatively, it is prepared by blending various additives and the like.
  • the refining process includes hydrorefining, solvent extraction, solvent dewaxing, hydrodewaxing, sulfuric acid washing, clay treatment, etc., and these are combined in an appropriate order for treatment, thereby providing a mineral oil-based lubrication suitable for the present invention.
  • An oil base oil can be obtained.
  • a mixture of a plurality of refined oils having different properties obtained by using different crude oils or distillate oils by different process combinations and sequences can also be used as suitable mineral oils.
  • This mineral oil preferably has an aromatic content of 20% or less from the viewpoint of handling safety.
  • Polybutene is a copolymer having a long-chain hydrocarbon molecular structure in which normal butene is partially reacted with isobutene as a main component. Those having a number average molecular weight of 2,000 to 50,000, particularly 5,000 to 20,000 are preferably used.
  • the content of polybutene is preferably 2 to 30% by mass, more preferably 5 to 15% by mass based on the total amount of the tail seal composition.
  • Synthetic base oils include, for example, polymer polymers such as poly- ⁇ -olefin (PAO) and low molecular weight ethylene / ⁇ -olefin copolymers, silicone oils, fatty acid esters, fluorinated oils, alkylnaphthalene, etc. Or in combination.
  • Animal and vegetable oil-based lubricating base oils include milk fat, beef tallow, lard (pig tallow), sheep fat, whale oil, coconut oil, bonito oil, herring oil, coconut oil, soybean oil, rapeseed oil, sunflower Oil, safflower oil, peanut oil, corn oil, cottonseed oil, rice bran oil, sesame oil, olive oil, linseed oil, castor oil, cocoa butter, palm oil, palm oil, hemp seed oil, rice oil, tea seed oil, etc. it can.
  • Inorganic powder As the inorganic powder of the present invention, oxides such as silicon, aluminum, magnesium and calcium, hydroxides, carbonates, sulfates and the like can be used, and a mixture thereof and a naturally produced powder can be used. Ore powders containing these compounds as main components can also be used. Specifically, talc, calcium carbonate, magnesium carbonate, calcium sulfate, aluminum hydroxide, magnesium oxide, calcium oxide, aluminum oxide, silica, bentonite, diatomaceous earth, and the like, particularly talc or calcium carbonate powder are suitable. These inorganic powders may be used alone or as a mixture of a plurality of types.
  • the inorganic powder preferably has an average particle size of 0.5 to 500 ⁇ m, more preferably 5 to 50 ⁇ m.
  • the content of the inorganic powder is 30 to 70% by mass, preferably 35 to 60% by mass, based on the total amount of the tail seal composition.
  • the tail seal composition it is necessary to adjust the tail seal composition to a suitable consistency, and it is used as a thickener in grease, etc., as a thickening agent for metal soap, urea thickener, organic polymer. It is preferable to use a thickener in combination.
  • the content of the thickener is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, based on the total amount of the tail seal composition.
  • the metal soap thickener is composed of a metal carboxylate, and the carboxylic acid may be an aliphatic carboxylic acid such as stearic acid or azelaic acid, or an aromatic carboxylic acid such as terephthalic acid. Aliphatic carboxylic acids having 6 to 20 carbon atoms are preferred.
  • the metal may be an alkali metal such as lithium or sodium, an alkaline earth metal such as calcium, or an amphoteric metal such as aluminum, but is preferably an alkali metal, particularly lithium.
  • Such carboxylic acid metal salts may be used singly or in combination.
  • urea-based thickener a diurea compound obtained by reaction of diisocyanate and monoamine, a polyurea compound obtained by reaction of diisocyanate and monoamine, diamine, and the like are suitable, and as an organic polymer thickener, PTFE (polytetrafluoroethylene) and the like are suitable.
  • the thickeners such as metal soap, urea, and organic polymer used in combination with the inorganic powder may be used alone or in combination of two or more.
  • the fiber is entangled with a brush that bundles metal nets and metal wires in the tail seal part of the shield machine, and is used to form a filter cloth layer having water-stopper together with a lubricant base oil and a thickener.
  • the fiber content is 2 to 10% by mass, preferably 3 to 8% by mass, based on the total amount of the tail seal composition.
  • This fiber contains short fibers and long fibers in order to improve the water-stopping property and pumpability in a balanced manner.
  • the average length of the short fibers is 0.8 to 2.4 mm, preferably 1.0 to 2.0 mm.
  • the average length of the long fibers is 1.5 to 10 times the average length of the short fibers used, and preferably 1.6 to 7 times.
  • the mass ratio of long fibers to short fibers contained is 1: 4 to 4: 1, preferably 1: 2 to 2: 1.
  • the average thickness (diameter) of the short fibers is preferably 5 to 100 ⁇ m, more preferably 10 to 50 ⁇ m.
  • the average thickness (diameter) of the long fibers is preferably 10 to 500 ⁇ m, more preferably 15 to 200 ⁇ m.
  • fibers can be either naturally derived natural fibers or organically synthesized synthetic fibers.
  • naturally occurring natural fibers include cellulose, cotton fibers, and wool fibers. , Polypropylene, polyester and the like.
  • inorganic fibers, such as carbon fiber and glass fiber can be used, asbestos fiber is not preferable in terms of environmental safety.
  • the short fiber is a natural fiber and the long fiber is a synthetic fiber or a natural fiber because the water stoppage and the pumpability can be further improved in a balanced manner.
  • the tail seal composition of the present invention contains detergents, dispersants, antiwear agents, oxidation agents, etc., which are generally used in lubricating oils and greases as necessary. Inhibitors, rust inhibitors, corrosion inhibitors, and the like can be added as appropriate. In particular, it is preferable to add 0.2 to 2% by mass of a fatty acid polyol ester or the like as a rust inhibitor, based on the total amount of the tail seal composition.
  • the tail seal composition was prepared by mixing at the ratio (mass%) shown in Table 1, and the density (g / Cm 3 ) and immiscible penetration. The results are shown in Table 1.
  • Base oil A2 polybutene, average molecular weight; 15,000 The kinematic viscosity (mm 2 / s) at 40 ° C. of each base oil is shown in Table 1.
  • Fiber Fiber C1 Cotton fiber, average length: 1.8 mm, average diameter: 18 ⁇ m
  • Fiber C2 Polystyrene terephthalate fiber, average length: 5 mm, average diameter: 20 ⁇ m
  • Fibrous C3 cellulose fiber, average length: 3.0 mm, average diameter: 43 ⁇ m
  • Tail Seal Composition 1 Water Resistant
  • a water pressure resistance test was performed under the following conditions to measure the presence or absence of effluent water.
  • a stainless steel pressure vessel having an inner diameter of 52 mm and a total of 16 openings (diameter 3 mm) was used at the center of the bottom part in 4 rows vertically and horizontally with a center interval of 5 mm.
  • a stainless steel mesh (No. 50, thickness 0.85 mm) was placed on the opening, and 50 g of the tail seal composition prepared above was introduced.
  • Tail Seal Composition 2 Pumpability
  • the pumpability was evaluated by an apparent viscosity test defined in JISK2220. 300 g or more of the tail seal composition prepared above is packed in a cylinder, extruded through a capillary tube by hydraulic pressure, and the pressure generated in the system at this time is measured. The apparent viscosity was calculated using the Poiseuille equation and evaluated by the apparent viscosity at a shear rate of 1 sec ⁇ 1 (apparent viscosity of 10,000 Pa ⁇ s or less; ⁇ , 10,000 to 20,000 Pa ⁇ s; ⁇ , 20 1,000 Pa ⁇ s or more; x). The lower the value of the apparent viscosity, the smaller the pressure loss and the better the pumpability.
  • Examples 1 to 7 containing polybutene at a predetermined ratio satisfy both the pumpability and water-stopping property at the same time, and among these, Examples 1 to 5 containing short fibers and long fibers at a predetermined ratio are particularly preferable. This composition is excellent in balance between pumpability and water stoppage.
  • the tail seal composition of the present invention can sufficiently prevent water from entering the brush seal portion of the shield machine tail and can be easily pumped to the brush seal portion. It is useful as a tail seal composition.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
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  • Geology (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
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  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Lubricants (AREA)
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Abstract

Provided is a tail seal composition exhibiting excellent cut-off performance and pumpability. A tail seal composition for use in a shield machine and containing 15-60 mass% of a lubricant base oil, 30-70 mass% of an inorganic powder, and 2-10 mass% of a fiber material containing short and long fibers, wherein the lubricant base oil contains mineral oil and polybutene in a mass ratio of 20:1-1:1.

Description

シールド掘進機用テールシール組成物Tail seal composition for shield machine
　本発明は、シールド掘進機用のテールシール組成物に関するものである。 The present invention relates to a tail seal composition for a shield machine.
　シールド掘進機により、地中にトンネルを掘削する場合、進行方向の地山を掘削しながら、シールド掘進機は前進し、シールド掘進機の後方には、順次、トンネルの内壁となるセグメントが組み上げられている。この場合、掘削されるトンネルの外径（掘削開孔径）は、シールド掘進機の外径となるが、セグメントはシールド掘進機内部で組み上げられるため、セグメントの外径はシールド掘進機の内径以下となる。このため、シールド掘進機の後方ではトンネル外径とセグメント外径との間に隙間が生じ、この隙間には、シールド掘進機の前進にともない、裏込剤が充填される。
　一方、シールド掘進機の後端で、未だ裏込剤が充填されていないトンネル内の空隙へは、地下水等が浸みだしており、この地下水のシールド掘進機内への侵入を防ぐため、シールド掘進機の末端にはシールド掘進機内のセグメントの外周とシールド掘進機の内周の間を止水するブラシシールが複数列、シールド掘進機の内周に設けられている。そして、その止水性を維持するために、これらのブラシシールの間にテールシール組成物が充填されている（例えば、特許文献１参照）。シールド掘進機の進行に伴い、ブラシシールのテールシール組成物は地山へ放散するため、ブラシシール部へのテールシール組成物の補充が必要となり、配管を通してテールシール組成物がポンプを用いて圧送される。 When excavating a tunnel into the ground with a shield machine, the shield machine advances while excavating ground in the direction of travel, and segments behind the shield machine are sequentially assembled as the inner wall of the tunnel. ing. In this case, the outer diameter of the tunnel to be excavated (excavation opening diameter) is the outer diameter of the shield machine, but since the segment is assembled inside the shield machine, the outer diameter of the segment is less than the inner diameter of the shield machine. Become. For this reason, a gap is formed between the outer diameter of the tunnel and the outer diameter of the segment behind the shield machine, and this gap is filled with a backing agent as the shield machine advances.
On the other hand, in the tunnel at the rear end of the shield machine that has not yet been filled with the backfill agent, groundwater and the like have oozed out. A plurality of rows of brush seals for stopping water between the outer circumference of the segment in the shield machine and the inner circumference of the shield machine are provided on the inner circumference of the shield machine. And in order to maintain the water stop, a tail seal composition is filled between these brush seals (see, for example, Patent Document 1). As the shield machine progresses, the tail seal composition of the brush seal diffuses to the ground, so it is necessary to replenish the brush seal with the tail seal composition, and the tail seal composition is pumped through the pipe using a pump. Is done.
　このテールシール組成物としては、鉱油系、合成系の潤滑油基油に、増ちょう剤としての鱗片状、その他無機充填剤、有機粉末、繊維質等を混合したものが用いられている（特許文献１～５参照）。 As this tail seal composition, a mixture of mineral oil-based or synthetic-based lubricating base oil and scale-like thickener, other inorganic fillers, organic powder, fiber, etc. is used (patent) Reference 1-5).
特公平７‐６３５０公報Japanese Patent Publication No. 7-6350 特開平３‐１９７７９８号公報Japanese Patent Laid-Open No. 3-197798 特開平５‐１８７１９４号公報JP-A-5-187194 特開平７‐１０９８９３号公報JP-A-7-109893 特開平９‐２０８９４３号公報Japanese Patent Laid-Open No. 9-208943
　従来、止水性を十分に高めたテールシール組成物は、粘性が高いため、圧送が困難な場合があり、シールド掘進機による掘削が中断するなどの問題があった。他方、圧送が容易なテールシール組成物は止水性に懸念があった。本発明は、このような問題点を解決するもので、止水性が高く、圧送性にも優れるテールシール組成物を提供するものである。 Conventionally, tail seal compositions with sufficiently high water-stopping properties have high viscosities, which may make it difficult to pump and cause problems such as interruption of excavation by a shield machine. On the other hand, a tail seal composition that can be easily pumped has a concern about water-stopping. The present invention solves such problems, and provides a tail seal composition having high water-stopping properties and excellent pumpability.
　本発明者らは上記課題を解決するために鋭意研究を進めた結果、驚くべきことに、テールシール組成物の潤滑油基油に所定割合の鉱油とポリブテンの混合物を用いることにより繊維質を適度に纏めて相反する課題である止水性と圧送性を同時に著しく高めることができ、また含有する繊維質を所定の組み合わせとすることにより、この止水性と圧送性をさらにバランスよく向上できることを見出した。 As a result of diligent research to solve the above-mentioned problems, the present inventors have surprisingly found that the use of a mixture of a predetermined ratio of mineral oil and polybutene as the lubricating base oil of the tail seal composition makes the fiber moderate. It has been found that the water-stopping property and the pumping property, which are problems that are contradictory to each other, can be remarkably improved at the same time, and that the water-stopping property and the pumping property can be further improved in a balanced manner by using a predetermined combination of fibers. .
　本発明は、かかる知見に基づきなされたもので、次の通りのものである。
（１）潤滑油基油１５～６０質量％、無機粉体３０～７０質量％および短繊維と長繊維とを含む繊維質２～１０質量％を含有し、前記潤滑油基油が鉱油とポリブテンを質量比２０：１～１：１の割合で含有するシールド掘進機用テールシール組成物。
（２）短繊維の平均長さが０.８～２.４ｍｍで、長繊維の平均長さが含有する短繊維の平均長さの１.５～１０倍であり、長繊維と短繊維の質量比が１：４～４：１である上記（１）に記載のシールド掘進機用テールシール組成物。
（３）鉱油の４０℃における動粘度が１００～３０００ｍｍ２／ｓで、ポリブテンの数平均分子量が５,０００～２０,０００である上記（１）に記載のシールド掘進機用テールシール組成物。
（４）無機粉体がタルクまたは炭酸カルシウムの少なくとも一種を含むものである上記（１）に記載のシールド掘進機用テールシール組成物。
（５）短繊維が天然繊維であり、長繊維が合成繊維または天然繊維である上記（１）に記載のシールド掘進機用テールシール組成物。 The present invention has been made based on such knowledge and is as follows.
(1) 15 to 60% by weight of a lubricating base oil, 30 to 70% by weight of inorganic powder, and 2 to 10% by weight of a fiber containing short fibers and long fibers, wherein the lubricating base oil contains mineral oil and polybutene Is a tail seal composition for a shield machine containing a mass ratio of 20: 1 to 1: 1.
(2) The average length of the short fibers is 0.8 to 2.4 mm, and the average length of the long fibers is 1.5 to 10 times the average length of the short fibers contained. The tail seal composition for a shield machine according to (1) above, wherein the mass ratio is 1: 4 to 4: 1.
(3) The tail seal composition for a shield machine according to (1) above, wherein the mineral oil has a kinematic viscosity at 40 ° C. of 100 to 3000 mm 2 / s and the polybutene has a number average molecular weight of 5,000 to 20,000.
(4) The tail seal composition for a shield machine according to the above (1), wherein the inorganic powder contains at least one of talc and calcium carbonate.
(5) The tail seal composition for a shield machine according to (1), wherein the short fibers are natural fibers and the long fibers are synthetic fibers or natural fibers.
　本発明のシールド掘進機用テールシール組成物は、止水性と圧送性を同時に向上できるため、シールド掘進機による掘削を効率的にかつ安全に行うことが可能となる。 Since the tail seal composition for a shield machine according to the present invention can simultaneously improve the water-stopping property and the pumpability, it is possible to perform excavation with a shield machine efficiently and safely.
　本発明のシールド掘進機用テールシール組成物は、潤滑油基油１５～６０質量％、無機粉体３０～７０質量％、繊維質２～１０質量％を含有するものであるが、この組成物は、圧送の容易性、止水性、水分混入時の安定性、高温時での油保持力のため、１５℃における密度が１.１～１.８ｇ／ｃｍ３のものが好ましく、１.１～１.５ｇ／ｃｍ３がより好ましくは、１.１～１.３ｇ／ｃｍ３がさらに好ましい。また、同様の理由により、不混和ちょう度が１５０～３５０のものが好ましく、２２０～２８０がより好ましい。なお、本発明にいう不混和ちょう度の測定は、ＪＩＳＫ２２２０に準拠する方法による。
　さらに、本発明のシールド掘進機用テールシール組成物は実質的に水分を含まないものが好ましい。実質的に水分を含まないとは、不可避的に混入する水分を排除するものではないことを意味するが、水分含有量としては、テールシール組成物全量基準で、好ましくは、５質量％以下、より好ましくは、１質量％以下である。 The tail seal composition for a shield machine according to the present invention contains 15 to 60% by mass of a lubricating base oil, 30 to 70% by mass of inorganic powder, and 2 to 10% by mass of fiber. Preferably, it has a density of 1.1 to 1.8 g / cm 3 at 15 ° C. because of ease of pumping, water-stopping, stability when mixed with water, and oil retention at high temperatures. ˜1.5 g / cm 3 is more preferred, and 1.1 to 1.3 g / cm 3 is even more preferred. For the same reason, those having an immiscibility consistency of 150 to 350 are preferred, and 220 to 280 is more preferred. In addition, the measurement of the immiscible penetration referred to in the present invention is based on a method based on JISK2220.
Furthermore, it is preferable that the tail seal composition for a shield machine of the present invention is substantially free of moisture. The fact that it does not substantially contain water means that it does not exclude water inevitably mixed in, but the water content is preferably 5% by mass or less based on the total amount of the tail seal composition, More preferably, it is 1 mass% or less.
［潤滑油基油］
　本発明の潤滑油基油は、鉱油とポリブテンを２０：１～１：１の質量比で含有するものである。ポリブテンの繊維質に対する接着性と鉱油の流動性およびこの両者の親和性が相俟って圧送性と止水性を同時に向上させるものと推測される。この鉱油とポリブテンの含有割合が、前記範囲外であるとこれらの効果が低くなる。鉱油とポリブテンの含有割合は１０：１～２：１が好ましく、５：１～３：１がより好ましい。
　この潤滑油基油の物性としては、４０℃における動粘度が１００～３,０００ｍｍ２／ｓのものが好ましく、５５０～１,５００ｍｍ２／ｓがさらに好ましい。さらに、流動点は－１０℃以下が好ましく、安全性の観点から、引火点は１５０℃以上が好ましい。
　この潤滑油基油の含有量は、テールシール組成物全量基準で、１５～６０質量％であるが、好ましくは２５～５８質量％、より好ましくは３５～５７質量％である。 [Lubricant base oil]
The lubricating base oil of the present invention contains mineral oil and polybutene in a mass ratio of 20: 1 to 1: 1. It is presumed that the adhesiveness of polybutene to the fiber, the fluidity of mineral oil, and the affinity of both improve the pumpability and water stoppage at the same time. When the content ratio of the mineral oil and polybutene is outside the above range, these effects are lowered. The content ratio of mineral oil and polybutene is preferably 10: 1 to 2: 1, and more preferably 5: 1 to 3: 1.
The physical properties of the lubricating base oil are preferably those having a kinematic viscosity at 40 ° C. of 100 to 3,000 mm 2 / s, and more preferably 550 to 1,500 mm 2 / s. Further, the pour point is preferably −10 ° C. or lower, and the flash point is preferably 150 ° C. or higher from the viewpoint of safety.
The content of the lubricating base oil is 15 to 60% by mass, preferably 25 to 58% by mass, more preferably 35 to 57% by mass, based on the total amount of the tail seal composition.
　潤滑油基油となる鉱油は、一般に市販されている鉱油系潤滑油あるいはこのベースオイルである鉱油系潤滑油基油を用いることができる。これらは、通常、原油を常圧蒸留し、あるいはさらに、この蒸留残渣油を減圧蒸留して得られる留出油を各種の精製プロセスで精製した潤滑油留分を基油とし、これをそのまま、或いはこれに各種の添加剤等を調合して調製される。前記精製プロセスは、水素化精製、溶剤抽出、溶剤脱ろう、水素化脱ろう、硫酸洗浄、白土処理などであり、これらを適宜の順序で組み合わせて処理して、本発明に好適な鉱油系潤滑油基油を得ることができる。異なる原油あるいは留出油を、異なるプロセスの組合せ、順序により得られた、性状の異なる複数の精製油の混合物も好適な鉱油として用いることができる。
　この鉱油は、取り扱いの安全上の観点から芳香族分が２０％以下のものが好ましい。 The mineral oil used as the lubricating base oil can be a commercially available mineral oil-based lubricating oil or a mineral oil-based lubricating base oil that is a base oil. These are usually obtained by subjecting a distillate obtained by subjecting crude oil to atmospheric distillation, or further distilling the distillation residue under reduced pressure, as a base oil as a base oil, Alternatively, it is prepared by blending various additives and the like. The refining process includes hydrorefining, solvent extraction, solvent dewaxing, hydrodewaxing, sulfuric acid washing, clay treatment, etc., and these are combined in an appropriate order for treatment, thereby providing a mineral oil-based lubrication suitable for the present invention. An oil base oil can be obtained. A mixture of a plurality of refined oils having different properties obtained by using different crude oils or distillate oils by different process combinations and sequences can also be used as suitable mineral oils.
This mineral oil preferably has an aromatic content of 20% or less from the viewpoint of handling safety.
　ポリブテンは、イソブテンを主成分として一部ノルマルブテンが反応した長鎖状炭化水素の分子構造を持った共重合物質である。数平均分子量が、２,０００～５０,０００、特には５,０００～２０,０００のものが好ましく用いられる。ポリブテンの含有量は、テールシール組成物全量基準で、２～３０質量％が好ましく、５～１５質量％がより好ましい。 Polybutene is a copolymer having a long-chain hydrocarbon molecular structure in which normal butene is partially reacted with isobutene as a main component. Those having a number average molecular weight of 2,000 to 50,000, particularly 5,000 to 20,000 are preferably used. The content of polybutene is preferably 2 to 30% by mass, more preferably 5 to 15% by mass based on the total amount of the tail seal composition.
　鉱油とポリブテン以外の潤滑油基油として、ポリブテン以外の合成油系や動植物油系の潤滑油基油を含有させることができる。合成系基油としては、例えば、ポリ‐α‐オレフィン（ＰＡＯ）、低分子量エチレン・α‐オレフィン共重合体、などの高分子ポリマー、シリコーン油、脂肪酸エステル、フッ素化油、アルキルナフタレンなどを単独であるいは組み合わせて用いることができる。また、動植物油系の潤滑油基油としては、牛乳脂、牛脂、ラード(豚脂)、羊脂、鯨油、鮭油、かつお油、にしん油、鱈油、さらには大豆油、菜種油、ひまわり油、サフラワー油、落花生油、とうもろこし油、綿実油、米ぬか油、ゴマ油、オリーブ油、アマニ油、ヒマシ油、カカオ脂、パーム油、ヤシ油、麻実油、米油、茶種油などを用いることができる。 As a lubricating base oil other than mineral oil and polybutene, a synthetic base oil or animal and vegetable oil base oil other than polybutene can be contained. Synthetic base oils include, for example, polymer polymers such as poly-α-olefin (PAO) and low molecular weight ethylene / α-olefin copolymers, silicone oils, fatty acid esters, fluorinated oils, alkylnaphthalene, etc. Or in combination. Animal and vegetable oil-based lubricating base oils include milk fat, beef tallow, lard (pig tallow), sheep fat, whale oil, coconut oil, bonito oil, herring oil, coconut oil, soybean oil, rapeseed oil, sunflower Oil, safflower oil, peanut oil, corn oil, cottonseed oil, rice bran oil, sesame oil, olive oil, linseed oil, castor oil, cocoa butter, palm oil, palm oil, hemp seed oil, rice oil, tea seed oil, etc. it can.
［無機粉体］
　本発明の無機粉体としては、珪素、アルミニウム、マグネシウム、カルシウム等の酸化物、水酸化物、炭酸塩、硫酸塩等の粉体を用いることができ、さらにこれらの混合物、及び、天然に産するこれらの化合物を主成分とする鉱石の粉体等も用いることができる。具体的には、タルク、炭酸カルシウム、炭酸マグネシウム、硫酸カルシウム、水酸化アルミニウム、酸化マグネシウム、酸化カルシウム、酸化アルミニウム、シリカ、ベントナイト、珪藻土など、特にはタルクまたは炭酸カルシウムの粉体が好適である。これらの無機粉体は、一種類でも複数の種類を混合して用いてもよい。
　上記無機粉体は、平均粒径が０.５～５００μｍのものが好ましく、５～５０μｍのものがより好ましい。この無機粉体の含有量は、テールシール組成物全量基準で、３０～７０質量％であり、３５～６０質量％が好ましい。 [Inorganic powder]
As the inorganic powder of the present invention, oxides such as silicon, aluminum, magnesium and calcium, hydroxides, carbonates, sulfates and the like can be used, and a mixture thereof and a naturally produced powder can be used. Ore powders containing these compounds as main components can also be used. Specifically, talc, calcium carbonate, magnesium carbonate, calcium sulfate, aluminum hydroxide, magnesium oxide, calcium oxide, aluminum oxide, silica, bentonite, diatomaceous earth, and the like, particularly talc or calcium carbonate powder are suitable. These inorganic powders may be used alone or as a mixture of a plurality of types.
The inorganic powder preferably has an average particle size of 0.5 to 500 μm, more preferably 5 to 50 μm. The content of the inorganic powder is 30 to 70% by mass, preferably 35 to 60% by mass, based on the total amount of the tail seal composition.
　さらには、テールシール組成物を圧送するのに適したちょう度に調整する必要があり、グリース等で増ちょう剤として用いられている金属石けん系増ちょう剤、ウレア系増ちょう剤、有機ポリマー系増ちょう剤を併用することが好ましい。
　この増ちょう剤の含有量は、テールシール組成物全量基準で、０.１～１０質量％が好ましく、０.２～５質量％がより好ましい。 Furthermore, it is necessary to adjust the tail seal composition to a suitable consistency, and it is used as a thickener in grease, etc., as a thickening agent for metal soap, urea thickener, organic polymer. It is preferable to use a thickener in combination.
The content of the thickener is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, based on the total amount of the tail seal composition.
　金属石けん系増ちょう剤は、金属カルボン酸塩からなり、カルボン酸がステアリン酸、アゼライン酸などの脂肪族カルボン酸でも、テレフタル酸などの芳香族カルボン酸でもよく、特には１価または２価の脂肪族カルボン酸で、炭素数６～２０の脂肪族カルボン酸のものが好ましい。また、金属は、リチウム、ナトリウムなどのアルカリ金属、カルシウムなどのアルカリ土類金属、アルミニウムのような両性金属でもよいが、アルカリ金属、特にはリチウムが好ましい。このようなカルボン酸金属塩は、一種類でも複数の種類を混合して用いてもよい。 The metal soap thickener is composed of a metal carboxylate, and the carboxylic acid may be an aliphatic carboxylic acid such as stearic acid or azelaic acid, or an aromatic carboxylic acid such as terephthalic acid. Aliphatic carboxylic acids having 6 to 20 carbon atoms are preferred. The metal may be an alkali metal such as lithium or sodium, an alkaline earth metal such as calcium, or an amphoteric metal such as aluminum, but is preferably an alkali metal, particularly lithium. Such carboxylic acid metal salts may be used singly or in combination.
　ウレア系増ちょう剤としては、ジイソシアネートとモノアミンとの反応で得られるジウレア化合物やジイソシアネートとモノアミン、ジアミンとの反応で得られるポリウレア化合物等が好適であり、また、有機ポリマー系増ちょう剤としては、ＰＴＦＥ（ポリテトラフルオロエチレン）などが好適である。なお、上記無機粉体に併用する、金属石けん系、ウレア系、有機ポリマー系等の増ちょう剤は、単独でも、２種類以上を併用しても良い。 As the urea-based thickener, a diurea compound obtained by reaction of diisocyanate and monoamine, a polyurea compound obtained by reaction of diisocyanate and monoamine, diamine, and the like are suitable, and as an organic polymer thickener, PTFE (polytetrafluoroethylene) and the like are suitable. In addition, the thickeners such as metal soap, urea, and organic polymer used in combination with the inorganic powder may be used alone or in combination of two or more.
［繊維質］
　繊維質は、シールド掘進機のテールシール部にある金属網や金属線を束ねたブラシに絡みつき、潤滑油基油、増ちょう剤とともに止水性のある濾布層を形成するために用いられる。繊維質は、テールシール組成物全量基準で、２～１０質量％、好ましくは３～８質量％含有する。
　この繊維質は、止水性と圧送性をバランスよく向上させるために、短繊維と長繊維とを含むものである。短繊維の平均長さが０.８～２.４ｍｍであり、好ましくは１.０～２.０ｍｍである。長繊維の平均長さは、使用する短繊維の平均長さの１.５～１０倍であり、好ましくは１.６～７倍のものである。含有する長繊維と短繊維の質量比は１：４～４：１であり、好ましくは１：２～２：１である。短繊維の平均太さ（直径）は５～１００μｍのものが好ましく、１０～５０μｍがより好ましい。長繊維の平均太さ（直径）は１０～５００μｍが好ましく、１５～２００μｍがより好ましい。 [Fiber]
The fiber is entangled with a brush that bundles metal nets and metal wires in the tail seal part of the shield machine, and is used to form a filter cloth layer having water-stopper together with a lubricant base oil and a thickener. The fiber content is 2 to 10% by mass, preferably 3 to 8% by mass, based on the total amount of the tail seal composition.
This fiber contains short fibers and long fibers in order to improve the water-stopping property and pumpability in a balanced manner. The average length of the short fibers is 0.8 to 2.4 mm, preferably 1.0 to 2.0 mm. The average length of the long fibers is 1.5 to 10 times the average length of the short fibers used, and preferably 1.6 to 7 times. The mass ratio of long fibers to short fibers contained is 1: 4 to 4: 1, preferably 1: 2 to 2: 1. The average thickness (diameter) of the short fibers is preferably 5 to 100 μm, more preferably 10 to 50 μm. The average thickness (diameter) of the long fibers is preferably 10 to 500 μm, more preferably 15 to 200 μm.
　これらの繊維質は、天然由来の天然繊維または有機合成された合成繊維のいずれをも用いることができ、例えば、天然由来の天然繊維としては、セルロース、綿繊維、羊毛繊維が、合成繊維としては、ポリプロピレン、ポリエステル等が挙げられる。また、炭素繊維やガラス繊維等の無機繊維も用いることができるが、アスベスト繊維は環境安全上好ましくない。
　なお、短繊維が天然繊維で、長繊維が合成繊維または天然繊維であると、さらに止水性と圧送性をバランスよく向上させることができ好ましい。 These fibers can be either naturally derived natural fibers or organically synthesized synthetic fibers. For example, naturally occurring natural fibers include cellulose, cotton fibers, and wool fibers. , Polypropylene, polyester and the like. Moreover, although inorganic fibers, such as carbon fiber and glass fiber, can be used, asbestos fiber is not preferable in terms of environmental safety.
In addition, it is preferable that the short fiber is a natural fiber and the long fiber is a synthetic fiber or a natural fiber because the water stoppage and the pumpability can be further improved in a balanced manner.
[D] 他の添加剤
　本発明のテールシール組成物には、上記成分以外に、必要に応じて、一般に潤滑油やグリースなどに用いられている、清浄剤、分散剤、摩耗防止剤、酸化防止剤、さび止め剤、腐食防止剤などを適宜添加することができる。特には、さび止め剤として、脂肪酸ポリオールエステルなどを、テールシール組成物全量基準で、０.２～２質量％添加することが好ましい。 [D] Other Additives In addition to the above components, the tail seal composition of the present invention contains detergents, dispersants, antiwear agents, oxidation agents, etc., which are generally used in lubricating oils and greases as necessary. Inhibitors, rust inhibitors, corrosion inhibitors, and the like can be added as appropriate. In particular, it is preferable to add 0.2 to 2% by mass of a fatty acid polyol ester or the like as a rust inhibitor, based on the total amount of the tail seal composition.
　次に示す潤滑油基油、無機粉体、増ちょう剤、および繊維質を用いて、表１に示す割合（質量％）で混合してテールシール組成物を調製し、１５℃における密度（ｇ／ｃｍ３）および不混和ちょう度を測定した。この結果を表１に示す。
〔テールシール組成物の成分〕
Ａ．潤滑油基油
　基油Ａ１：鉱油（ＪＸ日鉱日石エネルギー社製、溶剤精製潤滑油基油、１５℃の密度０.９０ｇ／ｃｍ３、４０℃の動粘度が５００ｍｍ２／ｓ）
　基油Ａ２：ポリブテン、平均分子量；１５,０００
　なお、上記各基油の４０℃における動粘度（ｍｍ２／ｓ）を表１に示した。
Ｂ．無機粉体、増ちょう剤
　無機粉体Ｂ１：タルク、平均粒径；２０μｍ
　無機粉体Ｂ２：炭酸カルシウム、平均粒径；１０μｍ
　増ちょう剤Ｂ３：Ｌｉステアリン酸石けん（関東化学社製試薬） Using the following lubricating base oil, inorganic powder, thickener, and fiber, the tail seal composition was prepared by mixing at the ratio (mass%) shown in Table 1, and the density (g / Cm 3 ) and immiscible penetration. The results are shown in Table 1.
[Components of tail seal composition]
A. Lubricating base oil Base oil A1: Mineral oil (manufactured by JX Nippon Oil & Energy, solvent refined lubricating base oil, density of 0.90 g / cm 3 at 15 ° C., kinematic viscosity at 40 ° C. of 500 mm 2 / s)
Base oil A2: polybutene, average molecular weight; 15,000
The kinematic viscosity (mm 2 / s) at 40 ° C. of each base oil is shown in Table 1.
B. Inorganic powder, thickener Inorganic powder B1: Talc, average particle size: 20 μm
Inorganic powder B2: calcium carbonate, average particle size: 10 μm
Thickener B3: Li stearic acid soap (reagent manufactured by Kanto Chemical Co., Inc.)
Ｃ．繊維質
　繊維質Ｃ１：綿繊維、平均長さ；１.８ｍｍ、平均直径；１８μｍ
　繊維質Ｃ２：ポリエスチレンテレフタレート繊維、平均長さ；５ｍｍ、平均直径；２０μｍ
　繊維質Ｃ３：セルロース繊維、平均長さ；３.０ｍｍ、平均直径；４３μｍ C. Fiber Fiber C1: Cotton fiber, average length: 1.8 mm, average diameter: 18 μm
Fiber C2: Polystyrene terephthalate fiber, average length: 5 mm, average diameter: 20 μm
Fibrous C3: cellulose fiber, average length: 3.0 mm, average diameter: 43 μm
〔テールシール組成物の評価１：止水性〕
　次に示す条件で耐水圧試験を行い、流出水の有無を測定した。
　底部中央部に、中心間隔５ｍｍで縦横に４列、合計１６個の開口（直径３ｍｍ）を有する内径５２ｍｍのステンレス製の圧力容器を用いた。開口上にステンレス製のメッシュ（５０番、厚み０.８５ｍｍ）を載せ、上記で調製したテールシール組成物５０ｇを導入した。テールシール組成物上に水（１０ｇ）を置き、空気で３５ｋｇｆ／ｃｍ２の圧力で５分間加圧し、その際の底部開口からの水の流出有無により止水性の評価（水の流出、無し；○、僅か有り；△、かなり有り；×）を行った。この結果を表１に示した。
　この結果、無機粉体が少ない比較例３は、止水性がないことが分かる。 [Evaluation of Tail Seal Composition 1: Water Resistant]
A water pressure resistance test was performed under the following conditions to measure the presence or absence of effluent water.
A stainless steel pressure vessel having an inner diameter of 52 mm and a total of 16 openings (diameter 3 mm) was used at the center of the bottom part in 4 rows vertically and horizontally with a center interval of 5 mm. A stainless steel mesh (No. 50, thickness 0.85 mm) was placed on the opening, and 50 g of the tail seal composition prepared above was introduced. Water (10 g) was placed on the tail seal composition, pressurized with air at a pressure of 35 kgf / cm 2 for 5 minutes, and the water stoppage was evaluated by the presence or absence of water outflow from the bottom opening (no outflow of water; no; ○, slight presence; Δ, considerable presence; x). The results are shown in Table 1.
As a result, it can be seen that Comparative Example 3 with a small amount of inorganic powder has no water-stopping property.
〔テールシール組成物の評価２：圧送性〕
　ＪＩＳＫ２２２０に定められている見掛け粘度試験にて圧送性を評価した。上記で調製したテールシール組成物３００ｇ以上をシリンダに詰め、油圧によって毛管を通して押し出し、このとき系統内に発生する圧力を測定する。ポアズイユの式を用いて見掛け粘度を算出し、せん断率１ｓｅｃ－１のときの見掛け粘度で評価した（見かけ粘度１０,０００Pa・s以下；○、１０,０００～２０,０００Pa・s；△、２０,０００Pa・s以上；×）。この見かけ粘度の数値は低いほど、圧力損失が少なく、圧送性に優れる。この結果を表１に示した。
　この結果、所定の割合でポリブテンを含有する実施例１～７は圧送性と止水性を同時に満足するが、このうちでも特に、短繊維と長繊維を所定の割合で含有する実施例１～５の組成物は、圧送性と止水性ともにバランスよく優れている。 [Evaluation of Tail Seal Composition 2: Pumpability]
The pumpability was evaluated by an apparent viscosity test defined in JISK2220. 300 g or more of the tail seal composition prepared above is packed in a cylinder, extruded through a capillary tube by hydraulic pressure, and the pressure generated in the system at this time is measured. The apparent viscosity was calculated using the Poiseuille equation and evaluated by the apparent viscosity at a shear rate of 1 sec −1 (apparent viscosity of 10,000 Pa · s or less; ○, 10,000 to 20,000 Pa · s; Δ, 20 1,000 Pa · s or more; x). The lower the value of the apparent viscosity, the smaller the pressure loss and the better the pumpability. The results are shown in Table 1.
As a result, Examples 1 to 7 containing polybutene at a predetermined ratio satisfy both the pumpability and water-stopping property at the same time, and among these, Examples 1 to 5 containing short fibers and long fibers at a predetermined ratio are particularly preferable. This composition is excellent in balance between pumpability and water stoppage.
Figure JPOXMLDOC01-appb-T000001
  
Figure JPOXMLDOC01-appb-T000001
  
　本発明のテールシール組成物は、シールド掘進機テールのブラシシール部への水の侵入を十分に防ぐことができ、また、そのブラシシール部へ容易に圧送することが可能となり、シールド掘進機用のテールシール組成物として有用である。  The tail seal composition of the present invention can sufficiently prevent water from entering the brush seal portion of the shield machine tail and can be easily pumped to the brush seal portion. It is useful as a tail seal composition.

Claims (5)

  1. 　潤滑油基油１５～６０質量％、無機粉体３０～７０質量％、および短繊維と長繊維とを含む繊維質２～１０質量％を含有し、前記潤滑油基油が鉱油とポリブテンを質量比２０：１～１：１で含有するシールド掘進機用テールシール組成物。 Lubricant base oil 15 to 60% by mass, inorganic powder 30 to 70% by mass, and fiber containing 2 to 10% by mass including short fibers and long fibers, and the lubricant base oil contains mineral oil and polybutene A tail seal composition for a shield machine containing a ratio of 20: 1 to 1: 1.
  2. 　短繊維の平均長さが０.８～２.４ｍｍで、長繊維の平均長さが含有する短繊維の平均長さの１.５～１０倍であり、長繊維と短繊維の質量比が１：４～４：１である請求項１に記載のシールド掘進機用テールシール組成物。 The average length of the short fibers is 0.8 to 2.4 mm, the average length of the long fibers is 1.5 to 10 times the average length of the short fibers contained, and the mass ratio of the long fibers to the short fibers is The tail seal composition for a shield machine according to claim 1, wherein the ratio is 1: 4 to 4: 1.
  3. 　鉱油の４０℃における動粘度が１００～３０００ｍｍ２／ｓで、ポリブテンの数平均分子量が５,０００～２０,０００である請求項１に記載のシールド掘進機用テールシール組成物。 Kinematic viscosity at 40 ° C. in mineral oil is 100 ~ 3000mm 2 / s, a shield machine for tail sealing composition according to claim 1 the number average molecular weight of polybutene of 5,000 to 20,000.
  4. 　無機粉体がタルクまたは炭酸カルシウムの少なくとも一種を含むものである請求項１に記載のシールド掘進機用テールシール組成物。 The tail seal composition for a shield machine according to claim 1, wherein the inorganic powder contains at least one of talc and calcium carbonate.
  5. 　短繊維が天然繊維であり、長繊維が合成繊維または天然繊維である請求項１に記載のシールド掘進機用テールシール組成物。  The tail seal composition for a shield machine according to claim 1, wherein the short fibers are natural fibers and the long fibers are synthetic fibers or natural fibers.
PCT/JP2015/072377 2014-08-07 2015-08-06 Tail seal composition for use in shield machine WO2016021690A1 (en)

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WO2016175258A1 (en) * 2015-04-30 2016-11-03 出光興産株式会社 Grease, mechanical component, and method for producing grease
CN106906031A (en) * 2017-03-09 2017-06-30 中铁第五勘察设计院集团有限公司 A kind of high water pressure resistant shield tail seal grease of shield and preparation method thereof
CN107312588A (en) * 2017-05-27 2017-11-03 中昊(大连)化工研究设计院有限公司 A high-stability shield machine main bearing sealing grease and preparation method thereof
JP2017200981A (en) * 2016-05-06 2017-11-09 株式会社ジェイテクト Grease composition and rolling bearing
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CN108913306A (en) * 2018-07-23 2018-11-30 中国石油化工股份有限公司 A kind of shield tail sealant with enhanced water resistance
CN109135882A (en) * 2017-06-16 2019-01-04 上海滏兴工贸有限公司 A kind of main shaft seals of shield machine grease and preparation method thereof
CN109207234A (en) * 2017-06-30 2019-01-15 江苏惠丰润滑材料股份有限公司 A kind of environment-friendly type shield machine shield tail seal grease and preparation method thereof
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CN109135882A (en) * 2017-06-16 2019-01-04 上海滏兴工贸有限公司 A kind of main shaft seals of shield machine grease and preparation method thereof
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