US20180355275A1 - Solid lubricant, lubricating coating agent for metal material, surface-treated metal material, and method for forming lubricating coating for metal material - Google Patents

Solid lubricant, lubricating coating agent for metal material, surface-treated metal material, and method for forming lubricating coating for metal material Download PDF

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Publication number
US20180355275A1
US20180355275A1 US15/569,215 US201615569215A US2018355275A1 US 20180355275 A1 US20180355275 A1 US 20180355275A1 US 201615569215 A US201615569215 A US 201615569215A US 2018355275 A1 US2018355275 A1 US 2018355275A1
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Prior art keywords
metal material
lubricating coating
solid lubricant
lubricating
mass
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US15/569,215
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English (en)
Inventor
Kenichiro Oshita
Shinobu Komiyama
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Nihon Parkerizing Co Ltd
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Nihon Parkerizing Co Ltd
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Application filed by Nihon Parkerizing Co Ltd filed Critical Nihon Parkerizing Co Ltd
Assigned to NIHON PARKERIZING CO., LTD. reassignment NIHON PARKERIZING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOMIYAMA, SHINOBU, OSHITA, KENICHIRO
Publication of US20180355275A1 publication Critical patent/US20180355275A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds only
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D201/00—Coating compositions based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C—CHEMISTRY; METALLURGY
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C09D5/033—Powdery paints characterised by the additives
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C09D7/66—Additives characterised by particle size
    • C—CHEMISTRY; METALLURGY
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    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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    • C10M101/02—Petroleum fractions
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    • C10M101/04—Fatty oil fractions
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    • C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
    • C10M103/06—Metal compounds
    • C—CHEMISTRY; METALLURGY
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/22—Carboxylic acids or their salts
    • C10M105/24—Carboxylic acids or their salts having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/40—Esters containing free hydroxy or carboxyl groups
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/74—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing phosphorus
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    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • C10M107/04—Polyethene
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    • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
    • C10M107/34—Polyoxyalkylenes
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    • C10N2020/06—Particles of special shape or size
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    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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    • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
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    • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
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    • C10N2040/241—Manufacturing joint-less pipes
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    • C10N2050/015—Dispersions of solid lubricants
    • C10N2050/02—Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
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    • C10N2050/08—Solids
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    • C10N2080/00—Special pretreatment of the material to be lubricated, e.g. phosphatising or chromatising of a metal
    • C10N2250/08—

Definitions

  • the present invention relates to a solid lubricant for imparting excellent lubricity to the surface of a metal material such as iron and steel, stainless steel, aluminum, and titanium, a lubricating coating agent including the solid lubricant, and a lubricating coating formed with the use thereof, as well as techniques related thereto. More particularly, the present invention is directed to a solid lubricant which can be used for plastic working such as forging, wire drawing, tube drawing, and heading of the metal material, for press molding of a plate material, and in sliding parts of various devices, and a lubricating coating agent including the solid lubricant, and further including no black-based lubricant such as molybdenum disulfide or graphite.
  • coatings that have lubricity and corrosion resistance are provided on the metal material surfaces.
  • Such coatings include two types: a reactive type of forming, on a metal material surface, a chemical conversion coating by chemical reaction, and then further forming a lubricant thereon; and a non-reactive type of physically forming a lubricant on a metal material surface.
  • Lubricating coatings that have a two-layer structure obtained by forming, on a metal material surface, a chemical conversion coating such as a phosphate coating or an oxalate coating that has a role as a carrier, and then further applying a lubricant such as a lime soap, a molybdenum disulfide, or an oil
  • lubricating coatings that have a three-layer structure (chemical conversion coating/metal soap coating/unreacted soap coating) obtained by applying a chemical conversion coating, and then reactive coating with a reactive soap such a sodium stearate are widely used in the case of the former reactive type.
  • the latter lubricating coatings that have the three-layer structure are known to be capable of producing stable and excellent lubricity even in heavy working regions.
  • Patent Literature 1 discloses a water-based lubricant for cold plastic working of metal materials, which includes: (A) at least one water-soluble inorganic salt selected from sodium tetraborate, borax, potassium tetraborate, and sodium sulfate; (B) at least one solid lubricant selected from metal soaps composed of calcium stearate, barium stearate, and zinc stearate, mica, and PTFE; (C) at least one oil component selected from a mineral oil, animal and plant oils, and an ester oil; (D) a surfactant for homogeneously emulsifying the oil component in water and homogeneously dispersing the solid lubricant in water; and (E) water, where the weight ratio (B/A) of the solid lubricant to the water-soluble inorganic salt is 0.05/1 to 2/1, and the weight ratio (C/(A+B)) of the oil component to the total amount
  • This lubricating coating agent is a non-reactive coating-type lubricant without the generation of sludge unlike the chemical conversion treatment with the chemical reaction and the reactive soap, and without solution deterioration.
  • the water-soluble inorganic salt which serves as a main constituent of a coating has the problem of possibly causing lubricity to be deteriorated through the moisture absorption from moisture vapor in the atmosphere, and there has been thus a need for re-drying before working or control for lowering humidity in the plant.
  • the lubricant included in the lubricating coating insufficiently follows to area expansions of metal surfaces under severe conditions on the degree of working, and has problems such as lubricity decreased, thereby leading to galling.
  • molybdenum disulfide has been used as a solid lubricant since a long time ago. This is due in large part to the low friction and favorable abrasion resistance of the lubricating coating containing molybdenum disulfide.
  • the lubricating coating agent containing molybdenum disulfide is black, which problematically contaminates working environments.
  • the expensiveness and poor economy of molybdenum disulfide are also reasons of demand for the development of non-black solid lubricants.
  • a main object of the present invention is to provide a solid lubricant that is non-black in color and capable of reducing industrial waste (environmental conservation), and further capable of achieving a balance among excellent lubricity, moisture absorption resistance, and corrosion resistance in a heavy working region, and a lubricating coating agent including the solid lubricant.
  • a solid lubricant characterized in that it includes carrier particles including therein a specific lipophilic lubricating component between particles of and/or between layers of a specific layered clay mineral, and a lubricating coating agent for a metal material, which uses the solid lubricant, thereby leading to the completion of the present invention.
  • a solid lubricant according to the present invention is a solid lubricant characterized in that it includes carrier particles including a lipophilic lubricating component that is at least one of an oil, an extreme-pressure agent, a soap, and a wax between particles of and/or between layers of at least one layered clay mineral selected from the group consisting of natural products and synthetic products of a smectite group, a vermiculite group, a mica group, a brittle mica group, a pyrophyllite group, and a kaolinite group.
  • carrier particles including a lipophilic lubricating component that is at least one of an oil, an extreme-pressure agent, a soap, and a wax between particles of and/or between layers of at least one layered clay mineral selected from the group consisting of natural products and synthetic products of a smectite group, a vermiculite group, a mica group, a brittle mica group, a pyrophyllite group, and a
  • the aspect ratio in a cross section of the layered clay mineral is 3 to 150, preferably 5 to 100, and further preferably 5 to 30.
  • the lipophilic lubricating component preferably has a solubility parameter (SP value) of 10 or less, further preferably 9 or less.
  • the layered clay mineral is preferably 40° or more, and further preferably 60° or more in water contact angle.
  • the layered clay mineral is preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less, and further preferably 10 ⁇ m or less in average particle size.
  • the solid lubricant is characterized in that the inclusion amount of the lipophilic lubricating component between the particles and/or between the layers is preferably 5 mass % or more, and further preferably 8 mass % or more in mass ratio to the total mass of the carrier particles.
  • the layered clay mineral preferably has Mohs hardness of 2 or less, and further preferably 1.
  • the solid lubricant can be used in a preferred manner in a lubricating coating agent for plastic working of metallic materials, in particular, a lubricating coating agent for cold plastic working.
  • a lubricating coating agent for a metal material characterized in that the lubricating coating agent contains the solid lubricant mentioned previously.
  • the lubricating coating agent for a metal material according to the present invention is a water-based lubricating coating agent for a metal material, where a component including the solid lubricant is dispersed in water, and the lubricating coating agent is characterized in that the concentration of the solid lubricant is 5 mass % or more in mass ratio to the mass of the total solid content in the lubricating coating agent.
  • an oil-based lubricating coating agent for a metal material where a component including the solid lubricant is dispersed in an oil.
  • the concentration of the solid lubricant is 5 mass % or more in mass ratio to the mass of the total solid content in the lubricating coating agent.
  • the problem mentioned previously can be also solved by a powder-based lubricating coating agent for a metal material, which contains a component including the solid lubricant according to the present invention.
  • the concentration of the solid lubricant is 5 mass % or more in mass ratio to the mass of the total solid content in the lubricating coating agent.
  • the problem mentioned previously can be also solved by a surface-treated metal material characterized in that a coating obtained by using the previously mentioned lubricating coating agent for a metal material is formed on/over a metal material surface to be 0.5 g/m 2 or more as a dried coating amount.
  • a method for forming a lubricating coating and a method for manufacturing a surface-treated metal material have only to include a contact step of bringing a metal material into contact with the previously mentioned lubricating coating agent for a metal material.
  • a method for forming a lubricating coating for a metal material and a method for manufacturing a surface-treated metal material can be applied, which are characterized in that the methods include, before the contact step mentioned previously, a cleanup step of cleaning up the surface of a metal material by at least one cleanup means from the group of shot blasting, sandblasting, alkaline degreasing, and acid cleaning.
  • a chemical conversion treatment step of coating the surface of the metal material with a chemical conversion coating can be also further applied before the contact step.
  • the solid lubricant characterized in that it includes the carrier particles including the lipophilic lubricating component between the particles of and/or the layers of the layered clay mineral, the lubricating coating agent for a metal material, the surface-treated metal material, and the method for forming a lubricating coating for a metal material are applied, thereby achieving a non-black color and great environmental conservation, producing excellent lubricity in a stable manner even in a heavy working region, and thus making it possible to prevent seizure and galling, and further achieving excellent operability such as the moisture absorption resistance of the lubricating coating, and further, excellent corrosion resistance.
  • the present invention will be described in more detail.
  • Solid Lubrication Handbook Japanese Society of Tribologists: Yokendo Co., Ltd. (2009) 53
  • the solid lubricant refers to a matter interposed between two objects for purposes such as friction reduction, seizure prevention, and improved mold life when the objects cause relative movement.
  • the solid lubricant is used as one component of a lubricating coating for plastic working, sliding members, press molding, and the like, and specifically, layered clay minerals, inorganic salts, polymer materials, soft metals, and the like are applied as the solid lubricant.
  • the layered clay minerals and the inorganic salts preferably themselves have cleavage.
  • Molybdenum disulfide and graphite are typical examples thereof.
  • the cleavage refers to the property of splitting and fracturing at a crystal face with the weakest atomic bonding force when a load is applied to a solid lubricant. This property causes, in plastic working, the solid lubricant to follow effective to an area expansion of the worked surface during the working, thereby imparting slidability, and at the same time, preventing galling.
  • a first feature of the present invention is that a cleavage layered clay mineral includes a lipophilic lubricating component between particles and/or between layers corresponding to cleavage faces, thereby in addition to the action of the layered clay mineral, further causing a solid lubricant to take a role as carrier particles for causing the lipophilic lubricating component to follow to an area expansion of the worked surface during working.
  • the layered clay mineral refers to particles of two-dimensional layered crystals stacked parallel and bonded. According to the present invention, the spaces between surfaces of the layered crystals are defined as interlayer spaces.
  • multiple primary particles may further aggregate (agglomerate) into larger secondary particles (the layered clay mineral that folios the secondary particles is referred to as an “aggregated layered clay mineral”), and in this case, the spaces between the particles are defined as inter-particle spaces.
  • the interlayer spaces and the inter-particle spaces are loosely bonded in a layered form, which serve as cleavage faces that are capable of including a lipophilic lubricating component according to the present invention.
  • the inclusion of the lipophilic lubricating component between the particles of and/or between the layers of the cleavage layered clay mineral allows the layered clay mineral and the lipophilic lubricating component to follow at the same time, that is, to take a role as carrier particles, even in working which is high in working load and high in the area expansion factor of the worked surface, such as cold plastic working, thereby imparting slidability at the same time as the prevention of galling, and thus allowing for improved lubricity.
  • the previous techniques have never achieved such a role taken as carrier particles.
  • the “inclusion” herein means conditions that the lipophilic lubricating component is trapped between the particles of and/or between the layers of the layered clay mineral.
  • the lipophilic lubricating component when the layered clay mineral is not cleaved, the lipophilic lubricating component is held between the particles of and/or between the layers of the layered clay mineral, and this condition is referred to as an “inclusion” condition according to the present invention.
  • the lipophilic lubricating component included between the particles of and/or between the layers of the layered clay mineral exudes to the worked surface, and the exudation of the lipophilic lubricating component follows along with the layered clay mineral so as to wet the worked surface.
  • lubricating coating agents that use a layered clay mineral including no lipophilic lubricating component between particles and/or between the layers may cause coatings to follow poorly to area expansions during working, due to the shortage of slidability, thereby decreasing the lubricity, and thus causing galling.
  • problems may arise such as a short mold life.
  • layered clay minerals that are capable of including the lipophilic lubricating component can include a smectite group of natural products and synthetic products, a vermiculite group of natural products and synthetic products, a mica group of natural products and synthetic products, a brittle mica group of natural products and synthetic products, a pyrophyllite group of natural products and synthetic products, and a kaolinite group of natural products and synthetic products.
  • These layered clay minerals may be each used alone, or more than one thereof may be used in combination.
  • a layered clay mineral with an organic substance supported between layers of the layered clay mineral by the method described in the International Publication WO 2012/086564 A may be used as the layered clay mineral mentioned previously.
  • the organic substance can include at least one cationic organic compound (organic group+cationic group) selected from organic ammonium compounds, organic phosphonium compounds, and organic sulfonium compounds.
  • the organic group of the organic compound is not particularly limited, but preferred are straight-chain, branched-chain, and cyclic (having a cyclic group) saturated hydrocarbon or unsaturated hydrocarbon groups having 1 to 30 carbon atoms.
  • the hydrogen atoms bonded to the carbon atoms constituting the carbon chains or the carbon rings may be substituted with other substituent groups, some of the carbon atoms constituting the carbon chains or the carbon rings may be substituted with other atoms (such as O and S, for example), and furthermore, other linkages (for example, ester linkages, ether linkages) may be included between C—C chains.
  • Preferred is an organic ammonium compound composed of: an aliphatic hydrocarbon group (preferably having 1 to 30 carbon atoms) which is advantageous for friction reducing ability; and an ammonium group which is advantageous for interlayer fixing ability.
  • organic salts for use in the interlayer introduction of the organic compound.
  • Particularly preferred organic salts are quaternary ammonium chlorides from which by-product salts are easily removed by water rinsing (such as (capryl trimethyl ammonium chlorides, lauryl trimethyl ammonium chlorides, stearyl trimethyl ammonium chlorides, dicapryl dimethyl ammonium chlorides, dilauryl dimethyl ammonium chlorides, and distearyl dimethyl ammonium chlorides).
  • quaternary ammonium chlorides from which by-product salts are easily removed by water rinsing such as (capryl trimethyl ammonium chlorides, lauryl trimethyl ammonium chlorides, stearyl trimethyl ammonium chlorides, dicapryl dimethyl ammonium chlorides, dilauryl dimethyl ammonium chlorides, and distearyl dimethyl ammonium chlorides).
  • Clay minerals are main-constituent minerals constituting clay, layered silicate minerals (phyllosilicate minerals), calcite, dolomite, feldspars, quartz, boiling stones (zeolite), and others, minerals that have chain-like structures (such as attapulgite, sepiolite), minerals that have no clearly crystal structure (allophane), and the like are referred to as clay minerals, and in general, layered silicate minerals among the clay minerals are referred to as layered clay minerals.
  • the layered clay mineral forms a crystal structure that has two-dimensional layers of positive and negative ions stacked parallel and bonded, and this layered structure has therein two structural units: one unit of a tetrahedral layer composed of Si 4+ and O 2 ⁇ surrounding the Si 4+ ; the other of an octahedral layer composed of Al 3+ (or Mg 2+ , Fe 2+ , or the like) and (OH) ⁇ surrounding the Al 3+ .
  • tetrahedral layer In the tetrahedral layer, O located at four vertexes of the tetrahedron and Si located in the center form tetrahedrons of Si—O, which are linked to each other at the three vertexes to spread two-dimensionally, thereby forming a layer lattice that has a composition of Si 4 O 10 .
  • the Si 4+ is often substituted with Al 3+ .
  • octahedral layer octahedrons formed by (OH) or O located at six vertexes of the octahedron and Al, Mg, Fe, or the like located in the center are linked at each vertex to spread two-dimensionally, thereby forming a layer lattice that has a composition of Al 2 (OH) 6 , Mg 3 (OH) 6 , or the like.
  • the octahedral layers include: a 3-octahedral type that has lattice points all occupied with a divalent cation (such as Mg 2+ ) at the lattice point of cation surrounded by six anions; and a 2-octahedral type that has 2 ⁇ 3 lattice points occupied with a trivalent cation (such as Al 3+ ) at the lattice point of cation, and 1 ⁇ 3 lattice points remaining vacant.
  • a divalent cation such as Mg 2+
  • 2-octahedral type that has 2 ⁇ 3 lattice points occupied with a trivalent cation (such as Al 3+ ) at the lattice point of cation, and 1 ⁇ 3 lattice points remaining vacant.
  • one of the combinations is a 2:1 type structure that has, as a unit, a linkage of two tetrahedral layers and one octahedral layer sandwiched therebetween; and the other is a 1:1 type structure that has, as a unit, a linkage of one tetrahedral layer and one octahedral layer.
  • the smectite group, vermiculite group, mica group, and pyrophyllite group mentioned previously refer to layered clay minerals that have the 2:1 type structure
  • the kaolinite group refers to layered clay minerals that have the 1:1 type structure.
  • the layered clay mineral has the 1:1 crystal structure, which is believed to exhibit hydrophilicity due to the orientation of octahedrons with hydrophilic groups (such as OH) at the surface.
  • hydrophilic groups such as OH
  • the 2:1 crystal structure there is believed to be a strong tendency to be lower in hydrophilicity than the 1:1 structure, because of the orientation of tetrahedrons having hydrophobic groups (SiO) at the surface.
  • the smectite group includes montmorillonite, beidellite, nontronite, saponite, iron saponite, hectorite, sauconite, and stevensite
  • the vermiculite group includes di.vermiculite and tri.vermiculite
  • the mica group includes muscovite, palagonite, illite, phlogopite, biotite, lepidolite, and lepidolite
  • the brittle mica group includes margarite and clintonite
  • the pyrophyllite group includes pyrophyllite and talc
  • the kaolinite group includes kaolinite, dickite, nacrite, halloysite, chrysotile, lizardite, and antigorite.
  • These layered clay minerals can be all used for a lubricating coating agent for metal materials according to the present invention, but among these minerals, particularly preferred is at least one selected from the two layered clay minerals that belong to the pyrophyllite group mentioned above. The reason is because the layered clay minerals that belong to the pyrophyllite group are low in Mohs hardness and excellent in lipophilicity.
  • the lipophilic lubricating component included between the particles of and/or between the layers of the layered clay mineral mentioned previously is at least one selected from an oil, an extreme-pressure agent, a soap, and a wax.
  • At least one selected from the group consisting of mineral oils, animal and plant oils, and synthetic oils can be used as the oil. More specifically, for example, naphthenic mineral oil or paraffinic mineral oil-based machine oils, turbine oils, spindle oils, and the like can be used as the mineral oils. For example, palm oils, rapeseed oils, coconut oils, castor oils, beef tallow, pork oils, whale oils, fish oils, or these components with ethylene oxide added thereto (for example, polyoxyethylene castor oils (ethylene oxide adducts)) can be used as the animal and plant oils.
  • Ester oils for example, esters of polyhydric alcohols such as ethylene glycol and trimethylolpropane and fatty acids such as stearic acid, oleic acid, and linoleic acid (e.g., trimethylolpropane trioleate)
  • silicone oils for example, polydimethylsiloxane and polydiphenylsiloxane
  • Hydrophobic organic compounds for example, organic ammonium compounds, organic phosphonium compounds, organic sulfonium compounds, organic amine compounds
  • the naphthenic mineral oils are preferred as the mineral oils; the palm oils and the castor oils of the plant oils, and the oils with ethylene oxide added thereto (polyoxyethylene plant oils (ethylene oxide adducts)) are preferred as the animal and plant oils; and the ester oils (trimethylolpropane trioleate) are preferred as the synthetic oils.
  • an agent that effectively develops an extreme-pressure effect at the friction surface between a metal material and a tool during working is preferred as the extreme-pressure agent.
  • an extreme-pressure agent can include sulphurized olefins, sulfurized esters, sulphites, thiocarbides, phosphate esters, phosphite esters, molybdenum dithiocarbamate (MoDTC), molybdenum dithiophosphate (MoDTP), zinc dithiophosphate (ZnDTP), and tricresyl phosphate, and the phosphates (tricresyl phosphate) are preferred.
  • the oil and the extreme-pressure agent are each included alone in the layered clay mineral, it is preferable to use the oil and the extreme-pressure agent in combination in order to achieve higher lubricity.
  • the ratio between the oil and the extreme-pressure agent preferably falls within the range of 1: 0.03 to 1:1 in mass ratio.
  • the ratio between the oil and the extreme-pressure agent is 1:0.03 to 1:1 in mass ratio, the lubricity is further improved with an extreme-pressure action imparted.
  • the ratio between the oil and the extreme-pressure agent exceeds 1:1, the extreme-pressure action is nearly saturated.
  • an alkali metal salt of a fatty acid such as stearic acid, myristic acid, palmitic acid
  • a metal soap obtained by reacting a fatty acid (such as stearic acid, myristic acid, palmitic acid) having 12 to 26 carbon atoms and at least one metal selected from zinc, calcium, barium, aluminum, and magnesium.
  • the soap preferably has a melting point of 100 to 250° C.
  • An alkali metal salt of a stearic acid and a metal soap (zinc stearate) obtained by reacting a fatty acid having 12 to 26 carbon atoms and zinc are more preferred as the soap.
  • the wax is not to be considered particularly specified in terms of structure and type, but preferably has a melting point of 70 to 150° C., because the wax is melted by heat generated during working, thereby developing lubricity.
  • Waxes that have a melting point in this range include, for example, microcrystalline waxes, polyethylene waxes, polypropylene waxes, and carnauba waxes, and polyethylene waxes are preferred.
  • the parameters of the lipophilic lubricating component include a solubility parameter (SP value, unit (cal/cm 3 ) 1/2 ).
  • the solubility parameter refers to a parameter for solubility or compatibility in a two-component system.
  • the solubility or compatibility is supposed to be better as the solubility parameters of the components are closer in value to each other.
  • Various methods are disclosed for the measurement method.
  • the SP value of the lipophilic lubricating component can be evaluated by dissolving the lipophilic lubricating component in a good solvent with a known SP value, and carry out turbidimetric titration with a poor solvent that is higher in SP value than the good solvent and a poor solvent that is lower in SP value than the good solvent.
  • the SP value of water is approximately 23, and as the SP value of a target component is lower than that of water, the lipophilicity is higher.
  • the lipophilic lubricating component for use in the present invention preferably has an SP value of 10 or less, and further preferably 9 or less.
  • the SP value of the lipophilic lubricating component exceeds 10
  • the amount of the lipophilic lubricating component included between the layers of the layered clay mineral may be decreased due to decreased lipophilicity, thereby decreasing the lubricity.
  • the barrier properties against corrosive factors such as water and chlorine may be decreased, thereby decreasing the corrosion resistance.
  • the lower limit of the SP value of the lipophilic lubricating component is not to be considered particularly specified, but for example, 7 or more.
  • the solid lubricant according to the present invention has preferably lipophilic properties between layers of and on the surface of the layered clay mineral.
  • Parameters therefor include a water contact angle.
  • the water contact angle at the surface of the layered clay mineral alone may be preferably 40° or more, further preferably 60° or more.
  • the upper limit of the water contact angle at the layered clay mineral is not to be considered particularly specified, but for example, 150° or less.
  • the water contact angle at the layered clay mineral alone is 40° or more
  • the previously mentioned lipophilic lubricating component has an SP value of 10 or less.
  • the inclusion of the lipophilic lubricating component between the particles and/or between the layers can be achieved in a more efficient manner, because of high mutual lipophilicity and affinity.
  • the inclusion amount of the lipophilic lubricating component is preferably 5 mass % or more, and further preferably 8 mass % or more in mass ratio to the total mass of the carrier particles. When the inclusion amount falls below 5 mass %, the lubricity during working may be decreased, thereby causing galling. In addition, the corrosion resistance may be also decreased.
  • the upper limit of the inclusion amount of the lipophilic lubricating component is not to be considered particularly limited, but for example, 50 mass % or lower.
  • the layered clay mineral for use in the solid lubricant according to the present invention preferably has Mohs hardness of 2 or less from the perspective of lubricity. Further preferred Mohs hardness is 1. The reason is because while the solid lubricant is broken to follow in the direction of area expansion at the surface worked in plastic working or press working, there is a tendency to achieve a lower friction coefficient and a better carrier property for the lipophilic lubricating component as the layered clay mineral is lower in Mohs hardness, and as a result, better lubricity is achieved.
  • the “carrier property” herein means that as a result of decreasing the friction coefficient of the layered clay mineral, the layered clay mineral is made more likely to follow in the direction of area expansion, and the lipophilic lubricating component is thus made likely to follow, along with the layered clay mineral, in the direction of area expansion at the worked surface.
  • Mohs hardness can be measured with a Mohs scale. More specifically, 10 types (10-level Mohs hardness from 1 to 10:1 for the softest and 10 for the hardest) of minerals that differ in hardness are adopted as reference materials, thereby evaluating whether the surface of the target material is scratched by a reference material or not.
  • the reference material with higher hardness is used and evaluated until being scratched.
  • the surface is scratched, it is confirmed that the surface of the reference material is reversely scratched by the target material, thereby determining the Mohs hardness of the substance. This is because the materials can scratch each other as long as the materials have the same hardness.
  • the solid lubricant including the lipophilic lubricating component according to the present invention can be used as a solid lubricant for any lubricating coating agent of: water-based lubricating coating agent; oil-based lubricating coating agent; powder-based lubricating coating agent.
  • the solid lubricant according to the present invention may be dispersed in water with a surfactant or the like.
  • concentration of the solid lubricant is adjusted to be 5 mass % or more, more preferably 20 mass % or more in mass ratio to the mass of the total solid content (coating component) in the lubricating coating agent.
  • the solid lubricant concentration of 5 mass % or more can enhance the lubricity dramatically, and the concentration of 20 mass % or more can further enhance the lubricity.
  • the upper limit of the concentration of the solid lubricant is not to be considered particularly limited, but for example, 95 mass % or lower, preferably 80 mass % or lower.
  • the concentration of the total solid content (coating component) including the solid lubricant is that the concentration is adjusted appropriately such that the dried coating amount is 0.5 g/m 2 or more.
  • the appropriate total solid content concentration in the lubricating coating agent may possibly vary depending on the condition (such as roughness) of the metal surface and the required degree of working, but typically, the concentration of the total solid content (coating component) including the solid lubricant in the lubricating coating agent is preferably 3 mass % or more when the total mass (also including water) of the lubricating coating agent is regarded as 100 mass %.
  • the concentration lower than the foregoing concentration reduces the dried coating amount, thereby leading to failure to achieve expected lubricity in some cases.
  • the upper limit of the concentration of the total solid content is not to be considered particularly limited, but for example, 70 mass % or lower, more preferably 50 mass % or lower.
  • the concentration of the total solid content (coating component) with respect to the total mass (also including water) of the lubricating coating agent can be measured by the following method. More specifically, the lubricating coating agent is collected in a defined amount into a container made of Teflon (registered trademark), and the collection amount is weighed accurately. Thereafter, volatile components such as water are evaporated in an oven at 110° C. for 2 hours, and the amount of residue (non-volatile component) is weighed accurately. The total solid content concentration is calculated from the following formula with the respective weighing values. It is to be noted that the weighing value after drying in the following formula corresponds to “the mass of the total solid content (coating component)” in calculating the concentration of the solid lubricant in the water-based lubricating coating agent.
  • total solid content concentration (mass %) [(weighing value after drying)/(weighing value before drying)] ⁇ 100
  • the components of the previously mentioned water-based lubricating coating agent other than the solid lubricant include a base component for a lubricating coating and/or a binder component. Specifically, at least one selected from a water-soluble inorganic salt, a water-soluble organic salt, a water-based resin, an oil-based resin, an oil, an extreme-pressure agent, a soap, and a wax can be applied.
  • a base component for a lubricating coating and/or a binder component Specifically, at least one selected from a water-soluble inorganic salt, a water-soluble organic salt, a water-based resin, an oil-based resin, an oil, an extreme-pressure agent, a soap, and a wax can be applied.
  • the combination of the solid lubricant according to the present invention with the foregoing components can form the solid lubricant more strongly to metal material surfaces, thereby making it possible to produce lubricity even in severer worked regions.
  • the water-soluble inorganic salt and the water-soluble organic salt, as well as the water-based resin have moisture absorption properties, and have the property of being likely to decrease the lubricity.
  • the solid lubricant composed of the carrier particles including the lipophilic lubricating component between the layers of and/or between the particles of the layered clay mineral makes a large contribution on lubricity, and the moisture absorption of the component added as a base component for a lubricating coating and/or a binder component, such as the water-soluble inorganic salt, the water-soluble organic salt, and the water-based resin has substantially no problem.
  • the water-soluble inorganic salt has at least one selected from the group consisting of sulfates, silicates, borates, molybdates, vanadates, tungstates, phosphates, and condensed phosphates.
  • the water-soluble organic salt has at least one selected from the group consisting of malates, succinates, citrates, and tartrates.
  • the cations of these salts have at least one selected from the group consisting of a sodium ion, a potassium ion, a lithium ion, an ammonium ion, amines (such as ethylamine), and alkanolamines (such as monoethanolamine and diethanolamine).
  • the tungstates, the borates, and the condensed phosphates are particularly superior as a base component for a lubricating coating and a binder, thereby making it possible to achieve high lubricity.
  • the water-based resin that is, water-soluble or water-dispersible polymer resin
  • at least one can be selected from polymer resins of 1,000 to 1,000,000 in weight average molecular weight.
  • the water-dispersible polymer resin is preferably 0.5 to 50 ⁇ m in average particle size (volumetric basis).
  • the type of the polymer resin is not particularly limited as long as the polymer resin has coating formability, and stable solubility or dispersibility, but for example, polymer resins can be used, such as acrylic resins, urethane resins, epoxy resins, phenolic resins, hydroxyethyl cellulose, carboxymethyl cellulose, and polyvinyl alcohol. It is to be noted that the weight average molecular weight of the polymer resin can be measured by a gel permeation chromatography method (GPC method).
  • the oil, the extreme-pressure agent, the soap, and the wax are also intended to serve as lipophilic lubricating components, and according to the present invention, serves as components to be included between the particles of and/or between the layers of the layered clay mineral, but can be also used as a base component for a coating.
  • the same as those included between the particles of and/or between the layers of the layered clay mineral may be used for the oil, the extreme-pressure agent, the soap, and the wax that can be used as a base component for a lubricating coating or a binder.
  • the lubricity is enhanced more when the oil is used in combination with the extreme-pressure agent.
  • the ratio between the oil and the extreme-pressure agent preferably falls within the range of 1:0.03 to 1:1 in mass ratio.
  • any of non-ionic surfactants, anionic surfactants, amphoteric surfactants, and cationic surfactants can be used as a surfactant that disperses, in water, the solid lubricant according to the present invention and the oil and the extreme-pressure agent as base components.
  • the non-ionic surfactants include, but not particularly limited thereto, for example, polyoxyethylene alkyl esters obtained from polyoxyethylene alkyl ether, polyoxyalkylene (ethylene and/or propylene) alkyl phenyl ether, or polyethylene glycol (or ethylene oxide) and a higher fatty acid (for example, 12 to 18 carbon atoms); and polyoxyethylene sorbitan alkyl esters composed of obtained from sorbitan, polyethylene glycol, and a higher fatty acid (for example, 12 to 18 carbon atoms).
  • the anionic surfactants include, but not particularly limited thereto, for example, fatty acid salts, sulfates, sulfonates, phosphates, and dithiophosphates.
  • amphoteric surfactants include, but not particularly limited thereto, for example, amino acid-type and betaine-type carboxylates, sulfates, sulfonates, and phosphates.
  • the cationic surfactants include, but not particularly limited thereto, for example, aliphatic amine salts and quaternary ammonium salts. These surfactants can be each used alone, or two or more of the surfactants can be used in combination.
  • the concentration of the surfactant is preferably 0.5 to 20 mass % in mass ratio to the mass of the total solid content (coating component) in the lubricating coating agent.
  • the proportion of the surfactant exceeds 20 mass %, the dispersibility of the solid lubricant is improved, while the lubricating coating may become fragile, thereby decreasing the lubricity.
  • the proportion falls below 0.5 mass %, the dispersibility of the solid lubricant is worsened, thereby making it impossible to form any uniform lubricating coating.
  • the oil and the extreme-pressure agent included in the layered clay mineral, or the oil and the extreme-pressure agent as a base component for a lubricating coating may be blended with a viscosity index improver for the purpose of achieving higher lubricity.
  • a viscosity index improver selected from polymethacrylates, olefin copolymers, and polyisobutylenes can be used.
  • the viscosity index (JIS K2283) is preferably 100 or more, and more preferably 200 or more.
  • the concentration of the viscosity index improver is 1 to 10 mass %, more preferably 1 to 5 mass % in mass ratio to the total amount of the oil and/or the extreme-pressure agent.
  • the addition of the viscosity index improver can suppress the decrease in oil viscosity due to a temperature increase during working. Thus, the amounts of the oil and extreme-pressure agent that can follow along with the solid lubricant are increased, thereby making it possible to make a further improvement in lubricity.
  • the oil alone, the extreme-pressure agent alone, or the oil and the extreme-pressure agent combined at 1:0.03 to 1:1 in mass ratio may be used as a base oil.
  • the concentration of the solid lubricant is 5 mass % or more, more preferably 20 mass % or more, and further preferably 30 mass % or more in mass ratio to the mass of the total solid content in the lubricating coating agent.
  • the lubricity can be further enhanced as the concentration of the solid lubricant is increased to 5 mass % or more, 20 mass % or more, and 30 mass % or more.
  • the upper limit of the concentration of the solid lubricant is not to be considered particularly limited, but for example, 95 mass % or lower, preferably 80 mass % or lower.
  • the same as those used for the water-based lubricating coating agent mentioned previously may be applied for the oil, the extreme-pressure agent, the soap, the wax, the oil-based resin, and the viscosity index improver as a base component.
  • an oil-based resin that is dissoluble or dispersible in an oil may be added as a binder.
  • a resin of 1,000 to 1,000,000 in weight average molecular weight selected from the group consisting of acrylic resins, urethane resins, epoxy resins, phenolic resins, and the like can be used as a binder.
  • the additive concentration is not particularly limited, but preferably falls within the range of 3 to 50 mass % in mass ratio to the total solid content of the lubricating coating.
  • the solid lubricant may be used in a way that the concentration of the solid lubricant is adjusted to 5 mass % or more, more preferably 30 mass % or more in mass ratio to the total solid content mass in the lubricating coating agent.
  • concentration of the solid lubricant is adjusted to 5 mass % or more, more preferably 30 mass % or more in mass ratio to the total solid content mass in the lubricating coating agent.
  • the adjustment of the solid lubricant concentration to 5 mass % or more can enhance the lubricity dramatically, and the adjustment thereof to 30 mass % or more can further increase the lubricity.
  • the solid lubricant itself may be applied directly to a metal material by an electrostatic powder coating or the like, and used (in this case, the concentration of the solid lubricant is 100 mass %), and a polymer resin may be used as a binder for the solid lubricant.
  • the type of such a polymer resin is not particularly limited, but a powder resin of 1,000 to 1,000,000 in weight average molecular weight and 0.5 to 30 ⁇ m in average particle size can be applied, such as an acrylic resin, a urethane resin, an epoxy resin, a phenolic resin, a hydroxyethyl cellulose, a carboxymethyl cellulose, and a polyvinyl alcohol.
  • a surface-treated metal material according to the present invention is characterized in that the above-described lubricating coating agent for metal materials according to the present invention is provided on/over a metal material surface to achieve a coating amount of 0.5 g/m 2 or more as a dry coating amount.
  • the set coating amount may be determined appropriately depending on the working level required. However, when the coating amount falls below 0.5 g/m 2 , the lubricating coating may fail to fully coat a metal material surface depending on the roughness of the surface, and attention is thus required in terms of lubricity and corrosion resistance.
  • the upper limit of the coating amount is not particularly specified, but even when the coating is formed in excess of 40 g/m 2 , lubricity improved enough to meet the formation can be no longer expected, which is not economical, and problems may be even caused, such as defectively even application, defective adhesion, and the production of indentation by the remaining coating.
  • a method for forming a lubricating coating for a metal material according to the present invention and a method for manufacturing a surface-treated metal material according to the present invention are characterized by including a contact step of bringing a metal material into contact with the lubricating coating agent for metal materials according to the present invention.
  • an immersion method, a flow coating method, a spray method, brush coating, a liquid electrostatic coating method, and the like can be applied in the case of the water-based lubricating coating agent and the oil-based lubricating coating agent.
  • the surface has only to be covered sufficiently with the lubricating coating agent according to the present invention, and there is no particular limit on the application time.
  • the agent may be left at room temperature, but preferably at 60 to 150° C. for 1 to 30 minutes.
  • the water-based lubricating coating agent in order to enhance drying characteristics, it is preferable to warm the metal material to 60 to 100° C., and bring the warmed metal material into contact with the water-based lubricating coating agent. It is to be noted that the metal material may be brought into contact with the water-based lubricating coating agent warmed to 50° C. to 90° C. Thus, the drying characteristics are improved significantly, thereby making drying possible at room temperature in some cases, and thus making it possible to reduce the thermal energy loss.
  • the method for applying the powder-based lubricating coating agent is not particularly limited, but it is preferable to apply an electrostatic powder coating method from the perspective of ease of controlling the even application and coating thickness.
  • the cleanup is intended to remove oxide scale grown by annealing or the like, and various types of contamination (e.g., oil).
  • contamination e.g., oil
  • reduced wastewater treatment burdens have been desired due to environmental concerns. In this case, the absence of wastewater can be achieved just by cleaning up the metal material surface by shot blasting, and then carrying out the contact step with the use of the lubricating coating agent according to the present invention.
  • the lubricating coating agent for metal materials according to the present invention is a non-reactive lubricating coating agent that involves no chemical conversion reaction, but after forming a chemical conversion coating in advance on the metal material surface (chemical conversion treatment step), the lubricating coating according to the present invention can be formed thereon, and used.
  • Components for such a chemical conversion coating include: a phosphate of at least one selected from Zn, Fe, Mn, Ni, Co, Ca, Mg, and Al (metal material: iron and steel, aluminum, magnesium, and the like); an iron oxalate (metal material: stainless steel); an aluminum fluoride (metal material: aluminum); and a zirconium oxide (metal material: iron and steel, aluminum, magnesium, and the like).
  • the application of the chemical conversion treatment further improves the lubricity, thereby making it possible to maintain excellent lubricity, for example, even in poor environments such as high-humidity environments.
  • parameters for efficiently including the lipophilic lubricating component between particles of and/or between layers of the layered clay mineral include three of: (1) the lipophilicity of the layered clay mineral and the SP value of the lipophilic lubricating component; (2) inclusion method; and (3) the average particle size and aspect ratio of the layered clay mineral.
  • the lipophilicity (water contact angle) of the layered clay mineral and the SP value of the lipophilic lubricating component are adapted as mentioned previously.
  • the inclusion method examples include, as an example, in the case of an oil and an extreme-pressure agent that are liquid at room temperature, an method of adding the oil and the extreme-pressure agent in predetermined amounts to a powder of the layered clay mineral, and causing the mineral to include therein the oil and the agent while stirring.
  • a so-called reduced-pressure impregnation method of, not simply the addition/stirring, but mixing the layered clay mineral, the oil, and the extreme-pressure agent in a decompression tank, and then returning the pressure to the atmospheric pressure, a method of inclusion with the oil warmed and thus reduced in viscosity, or the like.
  • methods for the inclusion of a soap or a wax that is solid at room temperature include a method of turning the soap or the wax into a liquid at a temperature equal to or higher than the melting point thereof, and then mixing the liquid with the layered clay mineral, thereby causing the layers to include the liquid therebetween, and a method of applying the lubricant to a metal material surface, and then putting the material in an oven kept at a temperature equal to or higher than the melting point, thereby causing the layers to include the soap or the wax therebetween during the drying.
  • mixing with the lipophilic lubricating component in an amount equal to or larger than the amount includable between the layers can interpose the lipophilic lubricating component not only between the layers, but also between the particles.
  • the layered clay mineral is preferably 0.5 to 30 ⁇ m, more preferably 1 to 20 ⁇ m, and further preferably 1 to 10 urn in average particle size.
  • the average particle size of 30 ⁇ m or less makes the lipophilic lubricating component likely to be included between the layers, thus improving the lubricity and the corrosion resistance.
  • the lubricity is further improved. Even when the average particle size is less than 0.5 ⁇ m, the lubricity and the corrosion resistance are favorable, and the average particle size is selected from the perspective of cost (manufacturing cost) ⁇ effectiveness (lubricity and corrosion resistance).
  • the aspect ratio in a cross section of the layered clay mineral preferably falls within the range of 3 to 150, more preferably 5 to 100, further preferably 5 to 30.
  • the aspect ratio in excess of 150 reduces the inclusion amount of the lipophilic lubricating amount, thereby possibly decreasing the lubricity and the corrosion resistance in some cases.
  • the lubricity is further improved as the aspect ratio is reduced to 150 or less, 100 or less, and 30 or less.
  • the aspect ratio falls below 3
  • the inclusion amount of the lipophilic lubricating component has no problem, but due to the layered clay mineral particles increased in thickness, the following performance of the lubricating coating may be decreased, thereby deteriorating the lubricity.
  • the average particle sizes of the water-dispersible polymer resin and layered clay mineral can be measured by a laser diffraction method (volumetric basis).
  • the average particle size of the layered clay mineral according to the present invention is intended for primary particles, and in order to keep as much as possible from being affected by secondary particles as aggregates of the primary particles, particle sizes are measured after enhancing redispersion (breaking secondary particles of the primary particles aggregated, thereby separating the secondary particles again into primary particles) with ultrasonic for approximately 3 to 5 minutes in advance.
  • the average particle size for substantially primary particles can be measured by eliminating as much as possible the influence of secondary particles of the primary particles aggregated. Therefore, the average particle size of the layered clay mineral according to the present invention refers to an average value on a volumetric basis for the particle sizes of the primary particles of the layered clay mineral.
  • the aspect ratio according to the present invention is supposed to be defined as an aspect ratio in a cross section of the layered clay mineral, and obtained from the following formula.
  • the layered clay mineral for use in the present invention have plate-like or scale-like particles of two-dimensionally layered crystals stacked parallel and bonded as mentioned previously, and the proportion of the length of a planar part (that is, a crystal face parallel to a cleavage face) to the thickness of the particle (the length in a direction perpendicular to the cleavage face) corresponds to the aspect ratio in a cross section of the layered clay mineral.
  • the thickness of the layered clay mineral particle and the length of the planar part can be measured at a magnification on the order of 3000 times with a scanning electron microscope (SEM). It is to be noted that the thickness of the layered clay mineral particle refers to a thickness that can be observed in the case of observation at approximately 3000-fold magnification with a SEM, but is not necessarily considered to mean the thickness of a unit lattice.
  • SEM scanning electron microscope
  • aspect ratio length of planar part of particle/thickness of particle
  • the lipophilicity of the layered clay mineral and the SP value of the lipophilic lubricating component as well as the average particle size and aspect ratio of the layered clay mineral are adapted to fall within the specific ranges, thereby making it possible to ensure, in a more reliable manner, that the inclusion amount of the lipophilic lubricating component into the layered clay mineral is 5 mass % or more.
  • the reduced-pressure impregnation method the method of mixing, with the layered clay mineral, a soap or a wax turned into a liquid at a temperature equal to or higher than the melting point thereof, thereby causing the particles and the layers to include the soap or the wax therebetween, or a method of applying the lubricant to a metal material surface, and then putting the material in an oven kept at a temperature equal to or higher than the melting point, thereby causing the particles and layers to include the soap or the wax therebetween during the drying is used, thereby making it possible to further increase the inclusion amount of the lipophilic lubricating component.
  • the average particle size of the layered clay mineral was measured by a laser diffraction method on a volumetric basis under the following conditions after the redispersion of the layered clay mineral into primary particles with ultrasonic in water for 3 minutes in advance.
  • the aspect ratio was calculated from the thickness of the particle (the length in a direction perpendicular to a cleavage face) and the length of the planar part (that is, the crystal face parallel to the cleavage face) by observation of the layered clay mineral at a magnification of 3000 times with a scanning electron microscope.
  • the layered clay mineral was subjected to an organic treatment in accordance with the method described in International Publication WO 2012/086564 A.
  • the water contact angle was measured with a bed of layered clay mineral powder between two copper plates (50 ⁇ 50 mm), which was pressed at a tightening force of 100 kgf into the form of a coating.
  • An automatic contact angle meter DM-501 from Kyowa Interface Science Co., Ltd. was used for the measurement.
  • A-1 kaolinite average particle size 3 ⁇ m, water contact angle 20°, Mohs hardness 2
  • A-2 organic treated kaolinite average particle size 3 ⁇ m, water contact angle 40°, Mohs hardness 2
  • A-3 organic treated kaolinite average particle size 3 ⁇ m, water contact angle 60°, Mohs hardness 2
  • A-4 organic treated kaolinite average particle size 3 ⁇ m, water contact angle 110°, Mohs hardness 2
  • A-5 talc average particle size 3 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-6 synthetic mica average particle size 3 ⁇ m, water contact angle 110°, Mohs hardness 3
  • A-7 talc average particle size 0.5 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-8 talc average particle size 10 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-9 talc average particle size 20 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-10 talc average particle size 30 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-11 talc average particle size 40 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-12 talc average particle size 10 ⁇ m, water contact angle 110°, Mohs
  • A-13 talc average particle size 10 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-14 talc average particle size 10 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-15 talc average particle size 10 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-16 talc average particle size 10 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-17 talc average particle size 10 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-18 talc average particle size 10 ⁇ m, water contact angle 110°, Mohs hardness 1
  • A-19 molybdenum disulfide average particle size 3 ⁇ m, water contact angle 120°, Mohs hardness 1
  • B-1 plant oil palm oil, SP value 8.5
  • B-2 plant oil castor oil, SP value 9.0
  • B-3 plant oil polyoxyethylene castor oil (product with 0.5 mol of ethylene oxide added), SP value 10.0
  • B-4 plant oil polyoxyethylene castor oil (product with 1 mol of ethylene oxide added), SP value 11.6
  • B-5 mineral oil naphthenic mineral oil, SP value 8.3
  • C-7 acrylic resin copolymerization product of methylmethacrylate and n-butylacrylate, subjected to emulsion polymerization with polyoxyethylene alkyl phenyl ether (molecular weight: 150000 or more), average particle size 0.5 ⁇ m, solid content concentration 40 mass %
  • the oil and extreme-pressure agent that are liquid at room temperature
  • the oil and the extreme-pressure agent were added to the layered clay mineral in proportions equal to or larger than an includable amount (1:1 in mass ratio), and mixed with the use of a mortar until being homogeneous in whole, thereby resulting in the lubricating component included between particles and/or between layers. Thereafter, the excess oil and extreme-pressure adhering to the surface of the layered clay mineral were removed by immersion in boiling water for 10 minutes, and the layered clay mineral was left to dry at room temperature for 24 hours.
  • the lubricating component turned into a liquid at a temperature equal to or higher than the melting points was added to the layered clay mineral (1:1 in mass ratio), and mixed therewith in a mortar until becoming fully homogeneous, thereby resulting in the lubricating component included between particles and/or between layers. Thereafter, the wax (or zinc stearate) adhering to particle surfaces was removed by immersion for 10 minutes in an oil bath warmed to a temperature equal to the melting point of the wax (or zinc stearate) or higher, thereafter, the oil on the particle surfaces was removed by immersion in boiling water for 10 minutes, and thereafter, the layered clay mineral was left to dry at room temperature for 24 hours.
  • the inclusion amount of the lipophilic lubricating component was measured with the use of a total organic carbon meter (TOC-5000/SSM-5000A from Shimadzu Corporation) equipped with a solid sample burning system.
  • TOC-5000/SSM-5000A total organic carbon meter
  • the measuring method will be mentioned in detail below.
  • a lipophilic lubricating component alone (lipophilic lubricating component itself) to be included was used and burned completely at a furnace temperature of 700° C., thereby creating a calibration curve of carbon intensity-lubricating component amount.
  • measured is the carbon intensity in carrier particles with the lipophilic lubricating component included between particles of and/or between layers of the layered clay mineral by the previously mentioned method under the same condition, and the obtained value is converted to the lubricating component amount.
  • inclusion amount (%) (mass of lipophilic lubricating component/total mass of carrier particle) ⁇ 100
  • coating amount (g/m 2 ) (test piece mass before removing ⁇ test piece mass after removing)/surface area of test piece
  • degreasing a test piece (metal material) was immersed for 10 minutes in a commercially available degreasing agent (registered trademark: FINECLEANER E6400 from Nihon Parkerizing Co., Ltd., concentration: 20 g/L) warmed to 60° C.
  • a commercially available degreasing agent registered trademark: FINECLEANER E6400 from Nihon Parkerizing Co., Ltd., concentration: 20 g/L
  • shot blasting a test piece (metal material) was subjected to a shot blasting treatment for 5 minutes with the use of shot balls of ⁇ 0.5 mm (from SUS).
  • degreasing a test piece (metal material) was immersed for 10 minutes in a commercially available degreasing agent (registered trademark: FINECLEANER E6400 from Nihon Parkerizing Co., Ltd., concentration: 20 g/L) warmed to 60° C.
  • a commercially available degreasing agent registered trademark: FINECLEANER E6400 from Nihon Parkerizing Co., Ltd., concentration: 20 g/L
  • shot blasting a test piece (metal material) was subjected to a shot blasting treatment for 5 minutes with the use of shot balls of ⁇ 0.5 mm (from SUS).
  • degreasing a test piece (metal material) was immersed for 10 minutes in a commercially available degreasing agent (registered trademark: FINECLEANER E6400 from Nihon Parkerizing Co., Ltd., concentration: 20 g/L) warmed to 60° C.
  • a commercially available degreasing agent registered trademark: FINECLEANER E6400 from Nihon Parkerizing Co., Ltd., concentration: 20 g/L
  • test piece subjected to the chemical conversion treatment was immersed for 30 seconds in tap water warmed to 60° C.
  • lubrication treatment contact step: the test piece washed with the water was immersed for 30 seconds in the lubricating coating agent for metal materials (see Table 1), warmed to 60° C.
  • Table 1 shows test standards for the water-based lubricating coating agents for metal materials.
  • composition of lubricating coating agent for metal material 1000 g in total) solid lubricant base component layered lipophilic inclusion blending solid content blending clay lubricating amount amount concentration base amount mineral component (mass %) (g) (mass %) component (g)
  • Example 1 A-1 B-12 4.3 100 50 B-12 95
  • Example 2 A-2 B-12 5.0 100 50 B-12 95
  • Example 3 A-3 B-12 8.0 100 50 B-12 95
  • Example 5 A-5 B-12 8.2 100 50 B-12 95
  • Example 6 A-6 B-12 8.1 100 50 B-12 95
  • Example 9 A-9 B-12 6.4 100 50 B-12 95
  • Example 10 A-10 B-12 5.1 100 50 B-12 95
  • Example 11 A-11 B-12 4.1 100 50 B-12 95
  • Example 12 A-12 B-12 8.2 100 50 B-12 95
  • Example 13 A-13 B-12 8.1 100 50
  • Table 2 shows test standards for the oil-based lubricating coating agents for metal materials.
  • composition of lubricating coating agent for metal material 1000 g in total
  • Example 48 A-1 B-12 4.3 300 30 B-12 700 100 Step C 25 water
  • Example 49 A-2 B-12 5.0 300 30 B-12 700 100 Step C 25 contact
  • Example 50 A-3 B-12 8.0 300 30 B-12 700 100 Step C 25 angle
  • Example 51 A-4 B-12 8.2 300 30 B-12 700 100 Step C 25 Example 52 A-5 B-12 8.2 300 30 B-12 700 100 Step C 25 Mohs
  • Example 54 A-7 B-12 8.1 300 30 B-12 700 100 Step C 25 average
  • Example 55 A-8 B-12 8.1 300 30 B-12 700 100 Step C 25 particle
  • Example 56 A-9 B
  • Table 3 shows test standards for the powder-based lubricating coating agents for metal materials.
  • composition of lubricating coating agent for metal material 1000 g in total
  • Example 82 A-1 B-12 4.3 700 70 C-8 300 100 Step D 10 water
  • Example 84 A-3 B-12 8.0 700 70 C-8 300 100 Step D 10 angle
  • degreasing a test piece (metal material) was immersed for 10 minutes in a commercially available degreasing agent (registered trademark: FINECLEANER E6400 from Nihon Parkerizing Co., Ltd., concentration: 20 g/L) warmed to 60° C.
  • a commercially available degreasing agent registered trademark: FINECLEANER E6400 from Nihon Parkerizing Co., Ltd., concentration: 20 g/L
  • test piece subjected to the phosphate treatment was immersed for 30 seconds in tap water at room temperature.
  • reactive soap treatment the test piece rinsed with the water was immersed for 5 minutes in a commercially available reactive soap treatment solution (registered trademark: PALUBE 235 from Nihon Parkerizing Co., Ltd., concentration: 70 g/L) warmed to 80° C.
  • a commercially available reactive soap treatment solution registered trademark: PALUBE 235 from Nihon Parkerizing Co., Ltd., concentration: 70 g/L
  • Patent Literature 1 JP 3517522 B2
  • the water-based lubricant listed below was prepared, and applied to a test piece by the method in accordance with the step A such that the dried coating amount was 10 g/m 2 .
  • sodium tetraborate 10.0 weight %
  • palm oil 5.0 weight %
  • polyoxyethylene alkyl ether 1.0 weight %
  • the following water-based lubricating coating agent was prepared with the use of the talc (A-5) including no lipophilic lubricating component.
  • the agent was applied to a test piece by the method in accordance with the step A such that the dried coating amount was 10 g/m 2 .
  • the following oil-based lubricant including no solid lubricant was used and applied to a test piece in accordance with the step C such that the coating amount was 25 g/m 2 .
  • the following powder-based lubricating coating agent was prepared with the use of the talc (A-5) including no lipophilic lubricating component.
  • the agent was applied to a test piece by the method in accordance with the step D such that the dried coating amount was 10 g/m 2 .
  • the following water-based lubricating coating agent was prepared with the use of molybdenum disulfide.
  • the agent was applied to a test piece by the method in accordance with the step A such that the dried coating amount was 10 g/m 2 .
  • solid lubricant A-19 (molybdenum disulfide) 100 g
  • test material S45C material (25 mm ⁇ 30 mm) subjected to spheroidizing annealing
  • test method Test was carried out in accordance with the invention in JP 3227721 B2 for the evaluation.
  • the lubricating coatings following protrusions of the test pieces were evaluated visually.
  • the lubricity was compared between a case of completely drying the lubricating coating under the condition of 80° C. for 3 minutes and a case of moisture absorption by the lubricating coating under the condition of 30° C. and relative humidity 80% for 5 hours after the complete drying.
  • evaluation criteria It is to be noted that the level B or higher corresponds to a practical level.
  • test material S45C, ⁇ 3.0 mm, 50000 mm in length
  • test method wire drawing was made under the condition of a reduction of area from 5 to 20% with the use of an R die The limited reduction of area capable of stable wire drawing without any scratch or chatter was evaluated in accordance with the following evaluation criteria. It is to be noted that the level B or higher corresponds to a practical level.
  • test material STKM17A, ⁇ 25.4 mm ⁇ 2.5 mmt, 2000 mm in length
  • test method Test was carried out under the condition of tube drawing speed 20 m/min with the use of an R die and a cylindrical plug in a draw bench The limited reduction of area capable of stable tube drawing without any scratch or chatter was evaluated in accordance with the following evaluation criteria. It is to be noted that the level B or higher corresponds to a practical level.
  • test material SPCC-SD, 70 mm ⁇ 150 mm ⁇ 0.8 mint
  • a Bowden test was carried out mainly as performance evaluation of sliding coatings (in the case of a water-soluble inorganic salt, a water-soluble organic salt, or a water-based resin for the base component of the lubricating coating). This test is carried out by sliding a plate test piece with the lubricating coating formed, with the test piece in contact with a steel ball under constant load, and measuring the friction coefficient and the sliding frequency. When the coating was fractured, and then seizured, the friction coefficient reached 0.25, and thus, the slidability was evaluated with the sliding frequency achieved until the friction coefficient reached 0.25. It is to be noted that the level B or higher corresponds to a practical level in the following evaluation criteria.
  • test temperature 60° C.
  • A 200 times or more, and less than 250 times
  • test material SPCC-SD, 70 mm ⁇ 150 mm ⁇ 0.8 mmt
  • test method for the corrosion resistance test, the plate test piece with the lubricating coating formed was left for 1 month in the plant in the Hiratsuka district, and evaluated with the rust area ratio. In the plant, the average temperature was 27.6° C., and the average humidity was 75%. It is to be noted that the level B or higher corresponds to a practical level in the following evaluation criteria.
  • the L value was measured as appearance evaluation after the formation of the lubricating coating.
  • test material SPCC-SD, 70 mm ⁇ 150 mm ⁇ 0.8 mmt
  • evaluation criteria here are evaluation criteria.
  • the degree of blackness is higher as the L value is lower, which is determined to mean a worse working environment.
  • the level B or higher corresponds to a practical level.
  • Table 4 shows the evaluation results for the water-based lubricating coating agents for metal materials.
  • Table 5 shows the evaluation results for the oil-based lubricating coating agents for metal materials.
  • Table 6 shows the evaluation results for the powder-based lubricating coating agents for metal materials.
  • Table 7 shows the evaluation results for comparative examples.
  • the lubricating coating agents for metal materials according to the examples of the present invention have achieved performance equal to or higher than the practical level (rated as B or higher) in all of the evaluation tests.
  • comparative example 1 subjected to the phosphate+reactive soap treatment has achieved lubricity at the practical level, but operability rated as C.
  • comparative example 2 has achieved corrosion resistance, operability, and an appearance at the practical levels, but lubricity rated as C in the condition of moisture absorption.
  • comparative examples 3 to 5 the lubricants including no solid lubricant according to the present invention, have failed to reach the practical levels, with all of the lubricity tests and the corrosion resistance rated as C or lower.
  • comparative example 6 has achieved excellent lubricity, corrosion resistance, and operability, but the black appearance of the coating was rated as C. From the foregoing results, the present invention can be considered to have a greater deal of potential in industry, as compared with the prior art.
US15/569,215 2015-04-27 2016-03-04 Solid lubricant, lubricating coating agent for metal material, surface-treated metal material, and method for forming lubricating coating for metal material Abandoned US20180355275A1 (en)

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CN114606041A (zh) * 2022-03-16 2022-06-10 四川大学 一种基于改性埃洛石的抗磨润滑剂及其制备方法
CN115232660A (zh) * 2022-06-24 2022-10-25 佛山科学技术学院 一种再制造成形层表面加工强化材料及其制备方法和应用
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