WO2020255279A1 - Élément de frottement, composition de matériau de frottement, matériau de frottement et véhicule - Google Patents

Élément de frottement, composition de matériau de frottement, matériau de frottement et véhicule Download PDF

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Publication number
WO2020255279A1
WO2020255279A1 PCT/JP2019/024204 JP2019024204W WO2020255279A1 WO 2020255279 A1 WO2020255279 A1 WO 2020255279A1 JP 2019024204 W JP2019024204 W JP 2019024204W WO 2020255279 A1 WO2020255279 A1 WO 2020255279A1
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Prior art keywords
friction material
friction
sulfide
mass
material composition
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PCT/JP2019/024204
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English (en)
Japanese (ja)
Inventor
和樹 横尾
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昭和電工マテリアルズ株式会社
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Priority to PCT/JP2019/024204 priority Critical patent/WO2020255279A1/fr
Publication of WO2020255279A1 publication Critical patent/WO2020255279A1/fr

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    • 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
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/14—Anti-slip materials; Abrasives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing

Definitions

  • the present invention relates to friction members, friction material compositions, friction materials and vehicles.
  • a drum brake is, for example, a drum brake in which a brake lining (also called a brake shoe) is mounted inside a drum installed inside a wheel, and the braking force is exerted by crimping the brake lining from the inside to the outside. Is.
  • a friction material is provided on the brake pad of the disc brake (hereinafter referred to as the disc brake pad) and the brake lining of the drum brake (hereinafter referred to as the drum brake lining), and the friction material is a disc rotor, a drum, or the like. Braking is performed by rubbing against the facing material and converting the kinetic energy of the automobile or the like into heat energy. Therefore, the friction material is required to have a good friction coefficient, wear resistance (the life of the friction material is long), strength, vibration damping property (the brake squeal is unlikely to occur), and the like.
  • NAO material a friction material containing no or almost no steel fiber, that is, a non-asbestos friction material (hereinafter, may be abbreviated as NAO material)
  • this NAO material includes Copper (including copper alloy) and the like
  • the friction material containing copper contains a large amount of copper in the abrasion powder generated by braking, which causes pollution of rivers, lakes, the ocean, and the like. Therefore, in some parts of North America, a law was enacted prohibiting the sale of friction materials containing 5% by mass or more of copper after 2021 and 0.5% by mass or more of copper after 2023 and the installation in new cars. .. Therefore, in order to make a friction material that can be used in other countries such as the United States, it is required that it does not contain copper or that the copper content is significantly reduced.
  • Patent Document 1 is a friction material composition containing a binder, an organic filler, an inorganic filler, and a fiber base material, and does not contain copper as an element or has a copper content of 0. It does not exceed 5% by mass, contains potassium titanate, and further contains at least one of lithium potassium titanate and potassium magnesium titanate, and among the potassium titanate, the potassium potassium titanate, and potassium magnesium titanate.
  • a friction material composition having a total of at least one type of 10 to 35% by mass and a mass reduction rate of 5 to 20% when heated at 500 ° C. in an air atmosphere.
  • Patent Document 1 provides a transfer film (a film in which a friction material composition is transferred to the surface of a disc rotor) that is stable during light load braking while having a composition that is less harmful to the environment and human body. It has been achieved by providing a friction material composition which is formed and gives a friction material which exhibits a stable friction coefficient.
  • the invention described in Patent Document 2 is a friction material composition containing a binder, an organic filler, an inorganic filler and a fiber base material, and the friction material composition does not contain copper as an element.
  • the copper content is 0.5% by mass or less, and one or more metal sulfides selected from tin sulfide, bismuth sulfide, and molybdenum disulfide are contained in an amount of 8 to 30% by mass. It is a friction material composition.
  • the invention described in Patent Document 2 is a friction material that does not contain copper or has a copper content of 0.5% by mass or less, which deteriorates high-speed fade characteristics, and can maintain a sufficient friction coefficient under high-speed fade conditions. This was achieved with the task of providing a material composition.
  • a stable transfer film is formed and stable during "light load braking" (for example, when traveling at a speed of about 20 to 50 km / h and the disc rotor temperature is low (50 ° C.)).
  • "light load braking" for example, when traveling at a speed of about 20 to 50 km / h and the disc rotor temperature is low (50 ° C.)
  • the coefficient of friction Expresses the coefficient of friction.
  • in a normal driving state in an urban area [for example, when traveling at a speed of about 40 to 70 km / h and the disc rotor temperature at the start of braking becomes about 120 ° C. (for example, 100 to 140 ° C.). ].
  • the friction coefficient and its stability when decelerating at 3 to 4 m / s 2 is repeated (normal braking) are not an issue, and the solution to the issue is unknown.
  • the invention described in Patent Document 2 is a friction material composition capable of maintaining a sufficient friction coefficient under high-speed fade conditions, but excellent friction
  • a copper spreading film is formed at the friction interface by braking, and the spreading film has an effect of preventing the friction material from being excessively worn when braking.
  • the friction coefficient and its stability were excellent.
  • a friction material that does not contain copper or has a low copper content is usually used.
  • a method of exhibiting an excellent friction coefficient and excellent stability of the friction coefficient when braking is repeated is desired.
  • antimony compounds such as antimony sulfide have been used for the purpose of suppressing wear of friction materials and wear of friction objects such as disc rotors by giving a lubricating action in a high temperature braking range.
  • antimony compounds has tended to be avoided from the viewpoint of environmental load and harmfulness to the human body. Therefore, it is required to exhibit an excellent friction coefficient and excellent stability of the friction coefficient when the normal braking is repeated by using a friction material using a material that does not have a concern about environmental load and harm to the human body.
  • an object of the present invention is to obtain a friction material composition capable of exhibiting an excellent friction coefficient and excellent stability of the friction coefficient when normal braking is repeated by using a material having a low environmental load and harm to the human body.
  • To provide to provide a friction member and a friction material using the friction material composition, and to provide the friction member or a vehicle equipped with the friction material.
  • the present inventors have been excellent in repeating normal braking by using a friction material composition containing a specific amount of two or more kinds of metal sulfides containing bismuth sulfide. It has been found that a friction coefficient can be obtained and the stability of the friction coefficient is also excellent, and the present invention has been completed. The present invention has been completed based on such findings.
  • the present invention relates to the following [1] to [17].
  • a friction member having a friction material and a back metal does not contain copper, or even if it contains copper, the content of copper is less than 0.5% by mass as a copper element, and two or more kinds of metal sulfides containing bismuth sulfide are totaled at 0.1.
  • the metal sulfide contains at least one selected from the group consisting of tin sulfide, molybdenum disulfide, iron sulfide, zinc sulfide, tungsten sulfide and manganese sulfide in addition to the bismuth sulfide.
  • the friction member described in. [3] The friction member according to the above [1] or [2], wherein the friction material further contains a titanate.
  • the titanate is at least one selected from the group consisting of potassium titanate, lithium titanate, magnesium magnesium titanate and sodium titanate.
  • the friction material further contains at least one selected from the group consisting of an organic filler, an inorganic filler (excluding the metal sulfide and the titanate), a fiber base material and a binder. , The friction member according to any one of the above [1] to [4].
  • the metal sulfide contains at least one selected from the group consisting of tin sulfide, molybdenum disulfide, iron sulfide, zinc sulfide, tungsten sulfide and manganese sulfide in addition to the bismuth sulfide.
  • the present invention using a material having a low environmental load and harm to the human body, an excellent friction coefficient can be obtained when normal braking is repeated, and a friction material composition having excellent stability of the friction coefficient, and , A friction member and a friction material using the friction material composition can be provided. Further, it is possible to provide the friction member or a vehicle equipped with the friction material.
  • the friction material of the present invention is used as a friction material for disc brake pads, brake linings, clutch facings, electromagnetic brakes, holding brakes, etc., it has a low environmental load and is less harmful to the human body.
  • the friction member the friction material composition, the friction material, and the vehicle according to the embodiment of the present invention will be described in detail.
  • the components are not essential unless otherwise specified.
  • the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
  • the content of each component in the friction material composition or in the friction material is, when a plurality of substances corresponding to each component are present, in the friction material composition or unless otherwise specified. It means the total content of the plurality of substances present in the friction material.
  • normal braking refers to braking in which the disc rotor temperature at the start of braking is 100 to 140 ° C. and decelerates at 3 to 4 m / s 2 .
  • the present invention also includes aspects in which the items described in the present specification are arbitrarily combined.
  • the friction member according to one aspect of the present invention is a friction member having a friction material and a back metal.
  • the friction material does not contain copper, or even if it contains copper, the content of copper is less than 0.5% by mass as a copper element, and two or more kinds of metal sulfides containing bismuth sulfide are totaled at 0.1. It is a friction member containing more than mass% and less than 8.0% by mass.
  • the material (friction material composition) used for the friction material will be described in detail.
  • Each component in the friction material composition and its content are synonymous with each component in the friction material and its content.
  • the friction material composition according to one aspect of the present invention is a friction material composition that does not contain copper, or even if it contains copper, the content of copper is less than 0.5% by mass as a copper element.
  • a preferred embodiment of the friction material composition is, in addition to the metal sulfide, at least one selected from the group consisting of an organic filler, an inorganic filler (excluding the metal sulfide), a fiber base material, and a binder. It is a friction material composition contained.
  • a more preferred embodiment is a friction material composition containing the metal sulfide, an organic filler, an inorganic filler (excluding the metal sulfide), a fiber base material, and a binder.
  • the friction material composition preferably does not contain copper, and when copper is contained, the content of copper in the friction material composition is set to less than 0.5% by mass as a copper element, so that it can be used as abrasion powder in the environment. Even if it is released, it can be considered not to cause pollution of rivers and the like.
  • the copper content indicates the content of copper element (Cu) contained in fibrous and powdery copper, copper alloys and copper compounds in the entire friction material composition.
  • the content of copper in the friction material composition is more preferably 0.2% by mass or less as a copper element, and further preferably 0.05% by mass or less.
  • the friction material composition of the present invention does not substantially contain antimony compounds such as antimony oxide and antimony sulfide from the viewpoint of environmental load and harmfulness to the human body.
  • antimony compounds such as antimony oxide and antimony sulfide from the viewpoint of environmental load and harmfulness to the human body.
  • substantially free (not included) and “substantially free of " are used to the extent that they do not affect the friction material composition (for example, 0.1% by mass or less). , Preferably 0.05% by mass or less, more preferably 0.01% by mass or less), or not at all (0% by mass), and so on.
  • the friction material composition of the present invention does not contain an iron-based metal, but even when an iron-based metal is contained, the friction material composition
  • the content of the iron-based metal in the friction material composition is more preferably 0.2% by mass or less, and further preferably 0.05% by mass or less as the iron element.
  • the iron-based metal is a metal containing iron as a main component and refers to general steel, and the iron content is that of iron, an iron element (Fe) contained in an iron alloy and an iron compound. The content in the entire friction material composition is shown.
  • the friction material composition of the present invention is classified as a NAO (Non-Asbestos-Organic) material, and is a so-called non-asbestos friction material composition (a friction material composition that does not contain asbestos, or when it is contained). Even if there is, it is a friction material composition with a very small amount of asbestos). The content of asbestos in the friction material composition is 0.2% by mass or less, and is substantially not contained.
  • NAO Non-Asbestos-Organic
  • the friction material composition of the present invention contains 0.1% by mass or more and 8.0% by mass of two or more kinds of metal sulfides containing bismuth sulfide from the viewpoint of the friction coefficient during repeated braking and the stability of the friction coefficient. Contains less than%.
  • metal sulfides other than bismuth sulfide include tin sulfide, molybdenum disulfide, iron sulfide, zinc sulfide, tungsten sulfide, manganese sulfide, and the like, and at least one selected from the group consisting of these. preferable.
  • antimony sulfide is substantially not contained as the metal sulfide (not to mention the friction material composition of the present invention).
  • the content of two or more kinds of metal sulfides including bismuth sulfide is the above-mentioned predetermined amount, copper is not contained, or even if it is contained, the copper content is less than 0.5% by mass as a copper element.
  • the friction material composition an excellent friction coefficient can be obtained, and the stability of the friction coefficient is also excellent.
  • the friction material composition of the present invention preferably further contains a titanate.
  • the content thereof is preferably 5% by mass or more, more preferably 10% by mass or more, and more preferably 13% by mass or more.
  • the upper limit of the content of titanate is not particularly limited, but is preferably 45% by mass or less, more preferably 30% by mass or less, still more preferably 20% by mass or less, and particularly preferably 17% by mass or less.
  • the content of the titanate is 5% by mass or more, the friction coefficient during repeated normal braking and the stability of the friction coefficient are further improved.
  • the titanate is not particularly limited, but for example, at least one selected from the group consisting of potassium titanate, lithium potassium titanate, magnesium potassium titanate, sodium titanate and the like can be used. .. Of these, potassium titanate is preferable from the viewpoint of the friction coefficient during repeated normal braking and the stability of the friction coefficient.
  • the shape of the titanate is not particularly limited, and examples thereof include fibrous, columnar, plate-like, particulate, and scaly shapes.
  • the shape of the titanate can be analyzed, for example, by observation with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the titanate is not particularly limited, but for example, a titanate having an average particle diameter of 1 to 50 ⁇ m and a specific surface area of 0.5 to 10 m 2 / g can be used.
  • the specific surface area can be determined by a BET method or the like using nitrogen gas as the adsorbed gas.
  • the average particle diameter means the value of d50 (median diameter of volume distribution, cumulative median value) measured by using the method of laser diffraction particle size distribution measurement.
  • a copper spreading film is formed at the friction interface by braking, and the spreading film has an effect of preventing the friction material from being excessively worn when braking at high speed.
  • the effect of copper cannot be substantially obtained. It is not always easy to obtain an excellent friction coefficient and to have excellent stability of the friction coefficient in a friction material that does not contain copper or has a low copper content, but the present invention According to the friction material composition, even a friction material containing no copper or a low content of copper exhibits an excellent friction coefficient and excellent stability of the friction coefficient when the normal braking is repeated.
  • the organic filler can exhibit a function as a friction modifier for improving vibration damping property, wear resistance and the like.
  • the organic filler does not include those having a fiber shape (for example, organic fibers described later).
  • the organic filler one type may be used alone, or two or more types may be used in combination.
  • an organic filler generally used in a friction material composition can be used, and examples thereof include cashew particles, rubber, and melamine particles. Among these, cashew particles and rubber are preferable from the viewpoint of improving the stability and wear resistance of the friction coefficient and suppressing squeal.
  • cashew particles and rubber may be used in combination, or cashew particles coated with rubber may be used.
  • the cashew particles are obtained by crushing a cured cashew nut shell oil, and are also generally referred to as cashew dust.
  • Cashew particles are generally classified into brown-based, brown-black-based, black-based, and the like according to the type of curing agent used in the curing reaction.
  • the average particle size of the cashew particles is not particularly limited, but from the viewpoint of dispersibility, it is preferably 850 ⁇ m or less, more preferably 750 ⁇ m or less, and further preferably 600 ⁇ m or less.
  • the lower limit of the average particle size of the cashew particles is not particularly limited, and may be 200 ⁇ m or more, 300 ⁇ m or more, or 400 ⁇ m or more. Commercially available products can be used as the cashew particles. One type of cashew particles may be used alone, or two or more types may be used in combination.
  • the content thereof is preferably 1 to 20% by mass, more preferably 3 to 15% by mass, and further preferably 5 to 15% by mass with respect to the friction material composition. %.
  • Examples of the rubber include rubber usually used in a friction material composition.
  • Examples of the rubber include natural rubber and synthetic rubber.
  • Examples of the synthetic rubber include acrylonitrile-butadiene rubber (NBR), acrylic rubber, isoprene rubber, polybutadiene rubber (BR), styrene-butadiene rubber (SBR), silicone rubber, and crushed powder of tire tread rubber.
  • NBR acrylonitrile-butadiene rubber
  • NBR acrylonitrile-butadiene rubber
  • NBR acrylonitrile-butadiene rubber
  • crushed powder of tire tread rubber are preferable from the viewpoint of the balance between heat resistance, flexibility and manufacturing cost.
  • the content thereof is preferably 1 to 30% by mass, more preferably 2 to 15% by mass, and 2 to 8% by mass in the friction material composition. It is more preferably%, and particularly preferably 2 to 5% by mass.
  • the elastic modulus of the friction material tends to be high, and it is possible to avoid deterioration of vibration damping properties such as squealing, and deterioration of heat resistance and heat resistance. There is a tendency to avoid a decrease in strength due to heat history.
  • the friction material composition may contain an inorganic filler.
  • the inorganic filler does not contain the metal sulfide and the titanate to avoid duplication.
  • the inorganic filler can exhibit a function as a friction adjusting material for avoiding deterioration of heat resistance, wear resistance, stability of friction coefficient and the like of the friction material.
  • the inorganic filler does not include those having a fiber shape (for example, inorganic fibers described later).
  • the inorganic filler one type may be used alone, or two or more types may be used in combination.
  • the inorganic filler is not particularly limited, and an inorganic filler usually used as a friction material can be used.
  • the inorganic filler examples include mica, graphite, coke, calcium hydroxide, calcium oxide, magnesium oxide, sodium carbonate, calcium carbonate, magnesium carbonate, barium sulfate, dolomite, coke, mica, vermiculite, calcium sulfate, talc, and clay.
  • the inorganic filler preferably does not contain copper, and more preferably does not contain copper or an iron-based metal.
  • at least one selected from the group consisting of zinc, graphite, alumina, zirconium silicate (zircon), calcium hydroxide, magnesium oxide and barium sulfate is preferable, and zinc, graphite, alumina and zirconium silicate (zircon) are preferable.
  • Calcium hydroxide, magnesium oxide and barium sulfate are more preferable in combination.
  • calcium hydroxide, calcium oxide, sodium carbonate and zinc oxide are preferable from the viewpoint of suppressing the generation of rust on the friction material.
  • calcium hydroxide, calcium oxide, and sodium carbonate increase the pH of the friction material, and the aramid fiber tends to be easily decomposed. Therefore, when used together with the aramid fiber, the amount used should not be too high.
  • the content of calcium hydroxide is preferably 0.5 to 10% by mass, more preferably 0.5 to 10% by mass, based on the friction material composition. It is 1 to 8% by mass, more preferably 1 to 5% by mass.
  • the graphite is not particularly limited, and any known graphite, that is, natural graphite or artificial graphite can be used.
  • the average particle size of graphite is preferably 1 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, further preferably 5 to 30 ⁇ m, and particularly preferably 10 to 20 ⁇ m.
  • the content thereof is preferably 2 to 20% by mass, more preferably 3 to 15% by mass, still more preferably 3 to 10% by mass, based on the friction material composition. Particularly preferably, it is 3 to 8% by mass.
  • the thermal conductivity of the friction material can be easily improved, and if it is 20% by mass or less, the decrease in the cohesive force of the friction material composition can be suppressed and the decrease in the friction coefficient tends to be easily suppressed. is there.
  • the content thereof is preferably 0.5 to 10% by mass, more preferably 0.5 to 8% by mass, and further, based on the friction material composition. It is preferably 1 to 6% by mass. Since zinc is more easily oxidized than iron, it tends to be possible to suppress the occurrence of rust within the above range without affecting the frictional characteristics.
  • the content thereof is preferably 0.1 to 10% by mass, more preferably 0.1 to 5% by mass, and further preferably 0. It is 5 to 3% by mass. Within the above range, it tends to be easy to impart appropriate grindability without excessively wearing the friction object.
  • the friction material composition contains zirconium silicate (zircon)
  • the content thereof is preferably 1 to 15% by mass, more preferably 1 to 10% by mass, still more preferably 3 with respect to the friction material composition. ⁇ 8% by mass. Within the above range, it tends to be easy to impart appropriate grindability without excessively wearing the friction object.
  • the content thereof is preferably 1 to 35% by mass, more preferably 5 to 30% by mass, and further preferably 10 to 30% by mass with respect to the friction material composition. Is. Within the above range, the friction coefficient during repeated normal braking and the stability of the friction coefficient tend to be excellent.
  • Barium sulphate serves as a mere filler for adjusting the volume of the friction material composition. That is, the content of barium sulfate depends on the content of other components, and the balance for adjusting the friction material composition to a predetermined amount can be replenished with barium sulfate. By containing barium sulfate, the bulk density of the friction material composition tends to increase, and the handleability tends to be good.
  • the friction material composition contains an inorganic filler
  • the total content of the inorganic filler (excluding the metal sulfide and the titanate), the metal sulfide and the titanate is contained. It is preferable to adjust the amount so as to be preferably 40 to 85% by mass, more preferably 50 to 85% by mass, and further preferably 60 to 85% by mass with respect to the friction material composition. Within this range, deterioration of heat resistance tends to be easily avoided.
  • the fiber base material exhibits a reinforcing action in the friction material.
  • the friction material composition preferably contains organic fibers as a fiber base material, and preferably contains inorganic fibers.
  • the fiber base material one type may be used alone, or two or more types may be used in combination.
  • the organic fiber is a fibrous material containing an organic substance as a main component.
  • the inorganic fiber is a fibrous material containing an inorganic substance other than a metal or a metal alloy as a main component.
  • the organic fiber examples include hemp, cotton, aramid fiber, cellulose fiber, acrylic fiber, phenol resin fiber (having a crosslinked structure) and the like.
  • One type of organic fiber may be used alone, or two or more types may be used in combination.
  • an aramid fiber is preferable from the viewpoint of heat resistance.
  • the fibrillated organic fiber is a fibrillated and fluffy organic fiber, and fibrillated aramid fiber, fibrillated acrylic fiber, fibrillated cellulose fiber and the like are commercially available.
  • the friction material composition may contain other organic fibers together with the fibrillated organic fibers.
  • the content thereof is preferably 1 to 8% by mass, preferably 2 to 7% by mass, based on the friction material composition. More preferably, it is 1 to 5% by mass. If it is 1% by mass or more, good shear strength, crack resistance and wear resistance tend to be exhibited, and if it is 8% by mass or less, it is different from the organic fiber (fibrillated organic fiber) in the friction material composition. There is a tendency that deterioration of shear strength and crack resistance due to uneven distribution of other materials can be effectively suppressed.
  • the -Inorganic fiber- Inorganic fibers can exhibit the effect of improving the mechanical strength and wear resistance of the friction material.
  • the inorganic fiber include glass fiber, metal fiber, mineral fiber, carbon fiber, ceramic fiber, biodegradable ceramic fiber, sepiolite (for example, ⁇ -type sepiolite and ⁇ -type sepiolite), attapulsite, potassium titanate fiber, and silica alumina. At least one selected from the group consisting of fibers, flame-resistant fibers and the like can be used.
  • the glass fiber refers to a fiber produced by melting and spinning glass.
  • the glass fiber those whose raw materials are E glass, C glass, S glass, D glass and the like can be used, and among these, glass containing E glass or S glass from the viewpoint of particularly high strength. It is preferable to use fiber. Further, from the viewpoint of improving the affinity with the binder, the glass fiber whose surface is treated with aminosilane, epoxysilane or the like is preferable.
  • the metal fiber is a fiber in the form of an alloy containing a single metal such as aluminum, iron, zinc, tin, titanium, nickel, magnesium, or at least one of the metals composed of these; a metal such as cast iron as a main component.
  • a single metal such as aluminum, iron, zinc, tin, titanium, nickel, magnesium, or at least one of the metals composed of these; a metal such as cast iron as a main component.
  • Examples include fibers to be used.
  • alloy fibers alloy fibers (alloy fibers) include iron alloy fibers and aluminum alloy fibers.
  • One type of metal fiber may be used alone, or two or more types may be used in combination.
  • the friction material composition may not contain metal fibers. From the viewpoint of improving crack resistance and abrasion resistance, copper fibers, copper alloy fibers, iron fibers and iron alloy fibers are generally preferred as the metal fibers.
  • the content of copper in the friction material composition is preferably less than 0.5% by mass, more preferably 0.3% by mass, as a copper element for the above-mentioned reasons.
  • the embodiment is more preferably 0.1% by mass or less, and particularly preferably substantially free of copper.
  • the copper alloy fiber include copper fiber, brass fiber, bronze fiber and the like.
  • the content of iron in the friction material composition may be less than 0.5% by mass as an iron element from the viewpoint of suppressing deterioration of durability due to rust. It is preferably 0.3% by mass or less, more preferably 0.1% by mass or less, and particularly preferably substantially iron-free.
  • the mineral fiber examples include natural mineral fiber; blast furnace slag such as slag wool, basalt such as basalt fiber, and artificial mineral fiber melt-spun with other natural rocks as main components.
  • the artificial mineral fiber examples include artificial mineral fiber containing SiO 2 , Al 2 O 3 , CaO, MgO, FeO, Na 2 O and the like, or artificial mineral fiber containing one or more of these compounds. Can be mentioned.
  • an artificial mineral fiber containing an aluminum element is preferable, an artificial mineral fiber containing Al 2 O 3 is more preferable, and an artificial mineral fiber containing Al 2 O 3 and SiO 2 is further preferable.
  • the mineral fiber is preferably biosoluble from the viewpoint of harm to the human body.
  • the biosoluble mineral fiber referred to here is a mineral fiber having a characteristic that it is partially decomposed in a short time and discharged to the outside of the body even when it is taken into the human body.
  • the chemical composition is such that the total amount of alkaline oxides and alkaline earth oxides (total amount of oxides of sodium, potassium, calcium, magnesium and barium) is 18% by mass or more, and (a) short-term inhalation.
  • biodegradable mineral fibers examples include SiO 2- Al 2 O 3 -CaO-MgO-FeO (-K 2 O-Na 2 O) -based fibers, and SiO 2 , Al 2 O 3 , and CaO.
  • MgO, FeO include mineral fibers containing at least two kinds in any combination is selected from K 2 O and Na 2 O or the like.
  • examples of commercially available products include the Rolex series manufactured by LAPINUS FIBERS BV. “Roxul” includes SiO 2 , Al 2 O 3 , CaO, MgO, FeO and the like, and may further include at least one selected from the group consisting of K 2 O and Na 2 O.
  • Examples of the carbon fiber include flame-resistant fiber, pitch-based carbon fiber, PAN-based carbon fiber, activated carbon fiber and the like.
  • One type of carbon fiber may be used alone, or two or more types may be used in combination.
  • the content thereof is preferably 3 to 50% by mass, more preferably 3 to 30% by mass, and further preferably 3 to 20% by mass with respect to the friction material composition. %, Especially preferably 5 to 15% by mass.
  • the binder has a function of binding and integrating an organic filler, an inorganic filler, a fiber base material, and the like to give a predetermined shape and strength.
  • the binder contained in the friction material composition is not particularly limited, but a thermosetting resin generally used as a binder for the friction material can be used.
  • the thermosetting resin include phenol resin, modified phenol resin, elastomer-dispersed phenol resin, epoxy resin, polyimide resin, melamine resin and the like.
  • examples of the modified phenolic resin include acrylic-modified phenolic resin, silicone-modified phenolic resin, cashew-modified phenolic resin, epoxy-modified phenolic resin, and alkylbenzene-modified phenolic resin.
  • the elastomer-dispersed phenolic resin examples include acrylic elastomer-dispersed phenolic resin and silicone elastomer-dispersed phenolic resin.
  • the thermosetting resin a phenol resin, an acrylic-modified phenol resin, a silicone-modified phenol resin, and an alkylbenzene-modified phenol resin are preferable, and a phenol resin is more preferable, from the viewpoint of providing good heat resistance, moldability, and friction coefficient.
  • the binder one type may be used alone, or two or more types may be used in combination.
  • the content thereof is preferably 5 to 25% by mass, more preferably 5 to 20% by mass, still more preferably 6 to 18% by mass, based on the friction material composition. , Particularly preferably 6 to 13% by mass.
  • the friction material composition contains the above-mentioned other materials, the contents include an organic filler, an inorganic filler (here, the metal sulfide and the titanate are included), a fiber base material and a bond.
  • organic additives such as fluorine-based polymers such as polytetrafluoroethylene (PTFE) from the viewpoint of improving wear resistance and heat fade characteristics.
  • PTFE polytetrafluoroethylene
  • It is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, further preferably 5 parts by mass or less, particularly preferably 3 parts by mass or less, and contains other materials with respect to 100 parts by mass of the total amount of the material. It does not have to be.
  • the present invention also provides a friction material containing the friction material composition.
  • the friction material may be formed only from the friction material composition of the present invention, or is a friction material having an upholstery material and an underlay material, and at least one of the upholstery material and the underlay material has the friction. It may be a friction material formed from a material composition.
  • the friction material is a friction material having an upholstery material and an underlaying material
  • the friction material composition of the present invention is preferably used as the upholstery material. Further, the friction material having the upholstery material and the underlaying material will be described with reference to FIG. 1.
  • the friction material composition of the present invention can obtain an excellent friction coefficient when normal braking is repeated, and the friction coefficient It is preferable to use it as the overlay material 1 of the friction member in order to improve the stability of the friction member.
  • the upholstery material 1 is a friction material that serves as a friction surface of the friction member
  • the underlay material 2 is a shear strength in the vicinity of the adhesive portion between the friction material and the back metal, which is interposed between the upholstery material 1 and the back metal 3. It is a layer for the purpose of improving crack resistance.
  • the friction material can be produced, preferably by molding the friction material composition by heat and pressure molding.
  • the friction material composition for the upholstery material and the friction material composition for the underlaying material are separately separated from each other, and the Radige mixer (“Radige” is a registered trademark) Mix using a mixer such as a pressurized kneader and an Erich mixer (“Erich” is a registered trademark), and premold the mixture for the upholstery material and the mixture for the underlaying material integrally with a molding die, and then premold.
  • the obtained premolded product is molded in 2 to 10 minutes under the conditions of, for example, a molding temperature of 130 to 160 ° C.
  • the obtained molded product is heat-treated at, for example, 150 to 250 ° C. for 2 to 10 hours.
  • painting, scorch treatment, and polishing treatment may be performed.
  • the preforming step may be omitted and the mixture may be directly thermoformed.
  • the friction material is useful as a friction material for disc brake pads of automobiles and the like, and as a friction material for drum brake linings of automobiles and the like. Further, it is also useful as a friction material for clutch facing, electromagnetic brake, holding brake, etc. by performing steps such as molding, processing, and pasting the friction material composition into a target shape.
  • the friction material of the present invention is suitable as a friction material for vehicles, especially for automobiles, because an excellent friction coefficient can be obtained when braking is repeated and the stability of the friction coefficient is also excellent. Is.
  • the back metal is usually used as a friction member in order to improve the mechanical strength of the friction member, and a metal, fiber reinforced plastic, or the like can be used as the material.
  • a metal, fiber reinforced plastic, or the like can be used as the material.
  • the back metal include iron, stainless steel, inorganic fiber reinforced plastic, carbon fiber reinforced plastic and the like.
  • the primer layer and the adhesive layer may be those usually used for friction members such as brake pads and brake linings.
  • the friction member 6 in FIG. 1 it is also possible to provide a friction member having a shim 4 on the side of the back metal 3 opposite to the side having the underlaying material 2.
  • the shim 4 is a spacer generally used for improving the vibration damping property of the friction member.
  • the present invention also provides a vehicle equipped with the friction member of the present embodiment.
  • a vehicle or the like in which the friction member of the present invention is used for a disc brake pad, a brake lining, a clutch facing, an electromagnetic brake, a holding brake, or the like can be mentioned.
  • the vehicle include various automobiles including motorcycles and motorcycles, such as large automobiles, medium-sized automobiles, ordinary automobiles, large special automobiles, small special automobiles, large motorcycles and ordinary motorcycles.
  • the reason why the friction coefficient up to the 49th brake is not considered is that the surface of a new or near-new friction material is not acclimated and the contact area is small, so the friction coefficient is low, which is used for evaluation of the friction coefficient. This is because it is not suitable for inclusion.
  • the order of excellent friction coefficient is A>B> C. (Evaluation criteria for the average value of the coefficient of friction during each braking) A: The average value is 0.37 or more and less than 0.46. B: The average value is 0.34 or more and less than 0.37, or 0.46 or more and less than 0.48. C: The average value is less than 0.34 or 0.48 or more.
  • [Making disc brake pads] In producing the disc brake pad, the following components of the friction material composition were prepared. Each component described in Table 1 is as follows. (Binder) ⁇ Phenolic resin (organic filler) ⁇ NBR: Acrylonitrile-butadiene rubber ⁇ Crushed powder of tire tread rubber ⁇ Cashew particles (inorganic filler) ⁇ Zinc, graphite, alumina, zircon, bismuth sulfide, tin sulfide, potassium titanate, calcium hydroxide, magnesium oxide, barium sulfate (fiber base material) ⁇ Aramid fiber: Fibrilized aramid fiber ⁇ Mineral fiber
  • Examples 1 to 3 and Comparative Examples 1 to 5 (Production of disc brake pads) Each component was blended according to the blending amount (part by mass) shown in Table 1 to obtain each friction material composition.
  • This friction material composition was mixed with a Ladyge mixer (manufactured by Matsubo Co., Ltd., trade name: Ladyge mixer M20) to obtain a mixture.
  • the obtained mixture was integrally premolded with a molding press (manufactured by Oji Kikai Kogyo Co., Ltd.).
  • the obtained premolded product is heated with an iron backing metal (manufactured by Hitachi Automotive Systems Co., Ltd.) using a molding press (manufactured by Sanki Seiko Co., Ltd.) under the conditions of a molding temperature of 145 ° C., a molding pressure of 35 MPa, and a molding time of 5 minutes. It was pressure molded.
  • the obtained molded product was heat-treated at 200 ° C. for 4.5 hours, polished using a rotary polishing machine, and scorch-treated at 500 ° C. to obtain a disc brake pad.
  • the disc brake pads obtained in each of the examples and the comparative examples have a friction material thickness of 9 mm. From the obtained disc brake pads, test pieces having a size of 20 mm ⁇ 45 mm square were produced by a cutting machine, and each measurement and evaluation was performed according to the above method. The results are shown in Table 1.
  • the friction material of the example is a friction material having less harmfulness to the human body and environmental load, and as compared with the friction material of the comparative example, an excellent friction coefficient can be obtained when normal braking is repeated, and the friction coefficient of the friction material can be obtained. It can be seen that it is also excellent in stability.
  • the friction member and the friction material of the present invention have low environmental load and harmfulness to the human body, and can obtain an excellent friction coefficient when normal braking is repeated, and are also excellent in stability of the friction coefficient. Therefore, it is particularly suitable as a friction member and a friction material for vehicles and the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Braking Arrangements (AREA)

Abstract

L'invention concerne une composition de matériau de frottement qui peut permettre d'obtenir un excellent coefficient de frottement pendant un freinage normal répété et qui présente une excellente stabilité du coefficient de frottement grâce à l'utilisation d'un matériau présentant un faible impact environnemental et se révélant sans danger pour l'organisme humain. L'invention concerne également un élément de frottement et un matériau de frottement qui utilisent la composition de matériau de frottement et un véhicule équipé de l'élément de frottement ou du matériau de frottement. En particulier, l'élément de frottement est un élément de frottement comportant un matériau de frottement et un métal de base, le matériau de frottement ne contenant pas de cuivre ou bien présentant une teneur en cuivre inférieure à 0,5 % en masse d'élément cuivre et contenant, au total, de 0,1 % en masse à moins de 8,0 % en masse d'au moins deux sulfures métalliques, dont le sulfure de bismuth.
PCT/JP2019/024204 2019-06-19 2019-06-19 Élément de frottement, composition de matériau de frottement, matériau de frottement et véhicule WO2020255279A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114702843A (zh) * 2022-05-10 2022-07-05 西南交通大学 一种改善大气环境下二硫化钼涂层摩擦磨损性能的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003503555A (ja) * 1999-06-29 2003-01-28 アライドシグナル インコーポレイテッド ブレーキライニングに用いるための硫化ビスマス含有固体潤滑剤
JP2003313312A (ja) * 2002-04-24 2003-11-06 Nisshinbo Ind Inc 非石綿系摩擦材
US20170082168A1 (en) * 2015-09-23 2017-03-23 Akebono Brake Industry Co., Ltd Friction material
WO2017090633A1 (fr) * 2015-11-27 2017-06-01 曙ブレーキ工業株式会社 Matériau de friction
US20180291974A1 (en) * 2017-04-06 2018-10-11 Akebono Brake Industry Co., Ltd Ferrous based friction material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003503555A (ja) * 1999-06-29 2003-01-28 アライドシグナル インコーポレイテッド ブレーキライニングに用いるための硫化ビスマス含有固体潤滑剤
JP2003313312A (ja) * 2002-04-24 2003-11-06 Nisshinbo Ind Inc 非石綿系摩擦材
US20170082168A1 (en) * 2015-09-23 2017-03-23 Akebono Brake Industry Co., Ltd Friction material
WO2017090633A1 (fr) * 2015-11-27 2017-06-01 曙ブレーキ工業株式会社 Matériau de friction
US20180291974A1 (en) * 2017-04-06 2018-10-11 Akebono Brake Industry Co., Ltd Ferrous based friction material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114702843A (zh) * 2022-05-10 2022-07-05 西南交通大学 一种改善大气环境下二硫化钼涂层摩擦磨损性能的方法

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