WO2017014173A1 - Matériau de friction - Google Patents

Matériau de friction Download PDF

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Publication number
WO2017014173A1
WO2017014173A1 PCT/JP2016/070953 JP2016070953W WO2017014173A1 WO 2017014173 A1 WO2017014173 A1 WO 2017014173A1 JP 2016070953 W JP2016070953 W JP 2016070953W WO 2017014173 A1 WO2017014173 A1 WO 2017014173A1
Authority
WO
WIPO (PCT)
Prior art keywords
friction material
friction
material composition
fiber
weight
Prior art date
Application number
PCT/JP2016/070953
Other languages
English (en)
Japanese (ja)
Inventor
和秀 山本
卓也 松澤
Original Assignee
日清紡ブレーキ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2016001976A external-priority patent/JP6764216B2/ja
Application filed by 日清紡ブレーキ株式会社 filed Critical 日清紡ブレーキ株式会社
Priority to US15/876,201 priority Critical patent/US11448277B2/en
Priority to CN201680042568.7A priority patent/CN107849431B/zh
Priority to KR1020187004746A priority patent/KR20180032598A/ko
Priority to EP16827733.3A priority patent/EP3327099A4/fr
Publication of WO2017014173A1 publication Critical patent/WO2017014173A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • 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—Compositions of linings; Methods of manufacturing

Definitions

  • the present invention relates to a friction material obtained by molding a friction material composition of NAO (Non-Asbestos-Organic) material used for a disc brake pad.
  • NAO Non-Asbestos-Organic
  • a disc brake is used as a braking device for a passenger car, and a disc brake pad in which a friction material is attached to a metal base member is used as the friction member.
  • Friction materials used for disc brake pads are mainly classified into the following three types.
  • the rust fixation is a phenomenon in which the disc rotor and the friction material are fixed by rust after the automobile is left for a long time in a parking brake state.
  • a technique of adding a pH adjusting material such as an alkali metal salt or an alkaline earth metal salt to the friction material is known.
  • Patent Literature 2 as a material effective in rust prevention of iron in a brake friction material made of a fiber base material, a friction adjusting material, and a binding material, an alkali metal alkaline earth metal hydroxide (calcium hydroxide or the like) is disclosed. ) And alkali metal alkaline earth metal carbonates (sodium carbonate, etc.).
  • Patent Document 3 describes a friction material obtained by heat-pressing a friction material composition containing 0.2 to 5% by weight of an alkali metal salt (sodium carbonate, potassium carbonate) in the entire composition. ing. According to the friction material of patent document 2 and patent document 3, it is supposed that the pH of the contact surface of a friction material and a disk rotor can be maintained alkaline, and the rusting of a disk rotor can be suppressed.
  • an alkali metal salt sodium carbonate, potassium carbonate
  • Patent Document 4 discloses a non-asbestos disc brake pad for automobiles including a fiber base material, a binder, and a friction modifier.
  • the binder includes at least a silicone-modified resin, and the friction modifier has an average particle size of 0.
  • a non-asbestos disc brake pad for automobiles is described which contains an organic filler containing abrasives having a Mohs hardness of 7 to 5 ⁇ m and an average particle size of 250 ⁇ m or less.
  • the present invention is a friction material obtained by molding a NAO material friction material composition used for a disc brake of an automobile or the like. Even when a vehicle in a parking brake state is left for a long time under high humidity, the effect of suppressing rusting is achieved. The friction material which can prevent rust fixation without decreasing is provided.
  • the present inventors are adding a water-repellent raw material to the friction material composition in order to eliminate moisture that usually causes direct rusting.
  • friction materials containing metal salts and alkaline earth metal salts conversely, by giving the friction materials themselves appropriate water absorption, rusting occurs even when a parking brake vehicle is left under high humidity for a long period of time. It has been found that the effect of suppressing the rust is not lowered and rust fixation can be prevented.
  • the present invention has been completed on the knowledge that the effect is further improved by adding a specific metal sulfide as a lubricant, a specific porous particle as a friction modifier, and a specific titanate.
  • the present invention is a friction material obtained by molding a friction material composition of NAO material used for a disc brake pad of an automobile or the like, and is based on the following technique.
  • the friction material composition is a pH adjustment material.
  • As an alkali metal salt and / or alkaline earth metal salt 2 to 6% by weight based on the total amount of the friction material composition, and fibrillated organic fiber as a fiber base material based on 1 to 7% by weight based on the total amount of the friction material composition
  • a friction material having a water-repellent component content of 0 to 0.5% by weight based on the total amount of the friction material composition is a pH adjustment material.
  • pH adjusting material comprises one or a combination of two or more selected from sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, and calcium hydroxide.
  • fibrillated organic fiber comprises one or a combination of two or more selected from aramid fiber, cellulose fiber, and acrylic fiber.
  • rusting occurs even when an automobile in a parking brake state is left for a long time under high humidity. It is possible to provide a friction material capable of preventing rust fixation without reducing the suppression effect.
  • the present invention relates to a friction material formed by molding a friction material composition of NAO material including a binder, a fiber base material, a friction adjustment material, a lubricant, a pH adjustment material, and a filler. And / or 2 to 6% by weight of alkaline earth metal salt based on the total amount of the friction material composition, and 1 to 7% by weight of organic fiber fibrillated as the fiber base material based on the total amount of the friction material composition, and A friction material composition having a water repellent component content of 0 to 0.5% by weight based on the total amount of the friction material composition is used.
  • the fibrillated organic fiber having water absorption as a fiber base material is contained with respect to the total amount of the friction material composition, and the content of the water-repellent component that inhibits water absorption is frictionally reduced.
  • an appropriate water absorption is imparted to the friction material itself.
  • alkali metal salts such as sodium carbonate, potassium carbonate, sodium hydrogen carbonate and potassium hydrogen carbonate
  • alkaline earth metal salts such as calcium hydroxide.
  • the fibrillated organic fiber one or a combination of two or more selected from aramid fiber, cellulose fiber, and acrylic fiber can be used.
  • the content of the alkali metal salt or alkaline earth metal salt as the pH adjusting material is less than 2% by weight based on the total amount of the friction material composition, a sufficient rust prevention effect cannot be obtained, and the content exceeds 6% by weight. In the heat and pressure molding process of the friction material, it becomes a factor that hinders the curing reaction of the phenol resin that is the binder, resulting in a problem that the wear resistance of the friction material is reduced.
  • the content of the fibrillated organic fiber is less than 1% by weight based on the total amount of the friction material composition, the friction material itself cannot be provided with appropriate water absorption, and thus the durability of the rust prevention effect is exhibited.
  • it exceeds 7% by weight fiber balls are generated in the mixing step, and there is a problem that poor mixing tends to occur.
  • 0.5 to 6% by weight of zinc sulfide is contained as a lubricant with respect to the total amount of the friction material composition.
  • Zinc sulfide has the effect of imparting lubricity to the friction material and improving wear resistance, and has the property of being decomposed by frictional heat between the friction material and the disk rotor during braking to generate metallic zinc.
  • Zeolite, activated carbon, activated alumina, etc. can be used as the porous inorganic particles.
  • activated carbon it is preferable to use activated carbon alone, and it is particularly preferable to use hydrophilic activated carbon that has been subjected to acid treatment with an acid such as hydrochloric acid or sulfuric acid to make the surface hydrophilic.
  • magnesium potassium titanate is contained as an inorganic friction modifier.
  • Magnesium potassium titanate has a higher alkali elution rate than 6-potassium titanate, 8-potassium titanate, and lithium-potassium titanate, so that the pH of the contact surface between the friction material and the disk rotor can be kept alkaline, and rusting occurs. Can be further improved.
  • the friction material of the present invention includes the above-mentioned pH adjusting material, fibrillated organic fiber, zinc sulfide, porous inorganic particles having sulfate ion adsorbing ability, as well as a binding material and a fiber base material that are normally used for friction materials. And a friction material composition including a friction modifier, a lubricant, and a filler.
  • binders straight phenol resin, phenol resin modified with cashew oil, various elastomers such as acrylic rubber and silicone rubber, aralkyl modified phenol obtained by reacting phenols, aralkyl ethers and aldehydes
  • binders are usually used for friction materials such as thermosetting resins in which various elastomers and fluoropolymers are dispersed in resins and phenol resins. These may be used alone or in combination of two or more. it can.
  • the content of the binder is preferably 9 to 15% by weight, more preferably 8 to 12% by weight, based on the total amount of the friction material composition in order to ensure sufficient mechanical strength and wear resistance. preferable.
  • the fiber base material examples include non-ferrous metal fibers such as copper fibers, bronze fibers, brass fibers, aluminum fibers, and aluminum-zinc alloy fibers in addition to the above-described fibrillated organic fibers. It can be used alone or in combination of two or more.
  • the content of the fiber base material is preferably 5 to 20% by weight, more preferably 7 to 15% by weight, based on the total amount of the friction material composition together with the fibrillated organic fiber.
  • metal sulfide-based lubricants such as molybdenum disulfide, tin sulfide, iron sulfide, composite metal sulfide, artificial graphite, natural graphite, flake graphite, petroleum coke, Lubricants usually used for friction materials such as carbonaceous lubricants such as elastic graphitized carbon and oxidized polyacrylonitrile fiber pulverized powder, etc. are mentioned, and these should be used alone or in combination of two or more. Can do.
  • the content of the lubricant is preferably 3 to 8% by weight, more preferably 4 to 6% by weight based on the total amount of the friction material composition together with the zinc sulfide.
  • the inorganic friction modifier examples include various metals such as zirconium oxide, zirconium silicate, magnesium oxide, ⁇ -alumina, talc, mica, vermiculite, copper and brass in addition to the porous inorganic particles and magnesium potassium titanate. Particles, plate-like titanates other than magnesium potassium titanate, particulate inorganic friction modifiers such as irregularly shaped titanates having a plurality of convex portions, wollastonite, sepiolite, basalt fiber, glass fiber, Examples thereof include fibrous inorganic friction modifiers such as biosoluble ceramic fibers and rock wool, and these can be used alone or in combination of two or more.
  • the content of the inorganic friction modifier is preferably 40 to 50% by weight, more preferably 43 to 47% by weight, based on the total amount of the friction material composition together with the porous inorganic particles.
  • Organic friction modifiers are usually used for crushed powder of cashew dust, tire tread rubber, vulcanized rubber powder such as nitrile rubber, acrylic rubber, butyl rubber, silicone rubber, or unvulcanized rubber powder. These organic friction modifiers can be used, and these can be used alone or in combination of two or more.
  • the content of the organic friction modifier is preferably 3 to 8% by weight, more preferably 4 to 7% by weight, based on the total amount of the friction material composition.
  • a filler such as barium sulfate is used.
  • those having water repellency are silicone rubber-modified phenolic resin, silicone rubber-dispersed phenolic resin, fluoropolymer-dispersed phenolic resin, silicone rubber powder, and various friction modifiers coated with silicone rubber or silicone oil.
  • the total water-repellent components of the silicone rubber, silicone oil and fluoropolymer contained in the raw materials are 0 to 0.5% by weight based on the total amount of the friction material composition. Use to be.
  • the friction material of the present invention comprises a mixing step in which a predetermined amount of the friction material composition is uniformly mixed using a mixer, and the resulting friction material raw material mixture is separately cleaned and surface-treated separately,
  • the applied back plate is overlaid and put into a thermoforming mold, and heated and pressed to form by heating and pressing, the resulting molded product is heated to complete the curing reaction of the binder, spray coating, It is manufactured through a painting process in which paint is applied by electrostatic powder coating, a paint baking process in which paint is baked, and a polishing process in which a friction surface is formed by a rotating grindstone.
  • the coating process, the heat treatment process also serving as paint baking, and the polishing process are performed in this order.
  • granulation step for granulating the friction material raw material mixture kneading step for kneading the friction material raw material mixture, granulation obtained in the friction material raw material mixture or granulation step
  • the preform and the kneaded product obtained in the kneading process are put into a preforming mold, and a preforming process for molding the preform is performed, and the scorch process is performed after the heat and pressure molding process.
  • Friction material compositions having the compositions shown in Tables 1 to 3 were mixed for 5 minutes with a Redige mixer, and pre-molded by pressurizing at 30 MPa in a molding die for 10 seconds. This preform is placed on a steel back plate that has been washed, surface-treated, and coated with an adhesive, and molded in a thermoforming mold at a molding temperature of 150 ° C. and a molding pressure of 40 MPa for 10 minutes, and then 200 Heat treatment (post-curing) was carried out at 5 ° C. for 5 hours, and polishing was performed to form a friction surface, thereby producing disc brake pads for passenger cars (Examples 1 to 26, Comparative Examples 1 to 5).
  • ⁇ Abrasion resistance> In accordance with JASO C427 "Automobile-brake lining and disc brake pad-dynamometer wear test method", braking initial speed 50km / h, braking deceleration 0.3G, braking frequency as appropriate, brake temperature before braking 200 ° C, The amount of wear (mm) of the friction material was measured, converted into the amount of wear per 1000 times of braking, and then evaluated according to the following criteria. : Less than 0.15 ⁇ : 0.15 or more and less than 0.20 ⁇ : 0.20 or more and less than 0.50 ⁇ : 0.50 or more-: Not evaluated due to poor mixing
  • a vehicle in a parking brake state can be used under high humidity while satisfying the regulations regarding the content of copper components. Even when left for a long period of time, the effect of suppressing rusting does not decrease, and a friction material capable of preventing rust fixation can be provided, which has extremely high practical value.

Abstract

La présente invention aborde le problème de la production d'un matériau de friction utilisé dans un frein à disque d'un véhicule automobile ou similaire et moulé à partir d'une composition de matériau de friction NAO, sans déclin de l'effet de suppression de la rouille même lorsqu'une automobile est laissée pendant une durée prolongée dans une condition d'humidité élevée dans un état dans lequel un frein de stationnement est enclenché, et l'adhérence de la rouille peut être empêchée. Le problème susmentionné est résolu au moyen d'un matériau de friction obtenu par moulage d'une composition de matériau de friction NAO comprenant un matériau de liaison, un matériau de base fibreux, un matériau d'ajustement de friction, un matériau lubrifiant, un matériau d'ajustement du pH, et une charge, la composition de matériau de friction étant conçue de sorte à comporter de 2 à 6 % en poids d'un sel de métal alcalin et/ou d'un sel de métal alcalino-terreux en tant que matériau d'ajustement du pH par rapport à la quantité totale de composition de matériau de friction, de 1 à 7 % en poids de fibres organiques fibrillées en tant que matériau de base fibreux par rapport à la quantité totale de composition de matériau de friction, et la teneur en constituants hydrophobes étant de 0 à 0,5 % en poids par rapport à la quantité totale de composition de matériau de friction.
PCT/JP2016/070953 2015-07-22 2016-07-15 Matériau de friction WO2017014173A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US15/876,201 US11448277B2 (en) 2015-07-22 2016-07-15 Friction material
CN201680042568.7A CN107849431B (zh) 2015-07-22 2016-07-15 摩擦材料
KR1020187004746A KR20180032598A (ko) 2015-07-22 2016-07-15 마찰재
EP16827733.3A EP3327099A4 (fr) 2015-07-22 2016-07-15 Matériau de friction

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2015145046 2015-07-22
JP2015-145046 2015-07-22
JP2016001976A JP6764216B2 (ja) 2015-07-22 2016-01-07 摩擦材
JP2016-001976 2016-07-01

Publications (1)

Publication Number Publication Date
WO2017014173A1 true WO2017014173A1 (fr) 2017-01-26

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Application Number Title Priority Date Filing Date
PCT/JP2016/070953 WO2017014173A1 (fr) 2015-07-22 2016-07-15 Matériau de friction

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Country Link
WO (1) WO2017014173A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109723740A (zh) * 2019-01-18 2019-05-07 北京浦然轨道交通科技有限公司 一种耐高温的合成制动闸片及其制备方法
CN110382654A (zh) * 2017-03-06 2019-10-25 日立化成株式会社 摩擦材料组合物、摩擦材料以及摩擦构件
WO2021246213A1 (fr) * 2020-06-02 2021-12-09 住友ベークライト株式会社 Composition de résine phénolique pour matériau de friction

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JPH09144792A (ja) * 1995-11-24 1997-06-03 Aisin Chem Co Ltd 摩擦材
JPH10121033A (ja) * 1996-10-18 1998-05-12 Nisshinbo Ind Inc 摩擦材
JP2004352738A (ja) * 2003-05-27 2004-12-16 Gun Ei Chem Ind Co Ltd 微細フェノール樹脂系繊維を用いた摩擦材
WO2014115594A1 (fr) * 2013-01-23 2014-07-31 日清紡ブレーキ株式会社 Matériau de frottement
JP2015074716A (ja) * 2013-10-09 2015-04-20 日本ブレーキ工業株式会社 摩擦材組成物、摩擦材組成物を用いた摩擦材及び摩擦部材
WO2015072440A1 (fr) * 2013-11-12 2015-05-21 曙ブレーキ工業株式会社 Matériau de friction
WO2016121748A1 (fr) * 2015-01-29 2016-08-04 日本ブレーキ工業株式会社 Composition de matériau de friction et matériau de friction et élément de friction utilisant la composition de matériau de friction
JP2016145274A (ja) * 2015-02-06 2016-08-12 日本ブレーキ工業株式会社 摩擦材および摩擦部材

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JPH09144792A (ja) * 1995-11-24 1997-06-03 Aisin Chem Co Ltd 摩擦材
JPH10121033A (ja) * 1996-10-18 1998-05-12 Nisshinbo Ind Inc 摩擦材
JP2004352738A (ja) * 2003-05-27 2004-12-16 Gun Ei Chem Ind Co Ltd 微細フェノール樹脂系繊維を用いた摩擦材
WO2014115594A1 (fr) * 2013-01-23 2014-07-31 日清紡ブレーキ株式会社 Matériau de frottement
JP2015074716A (ja) * 2013-10-09 2015-04-20 日本ブレーキ工業株式会社 摩擦材組成物、摩擦材組成物を用いた摩擦材及び摩擦部材
WO2015072440A1 (fr) * 2013-11-12 2015-05-21 曙ブレーキ工業株式会社 Matériau de friction
WO2016121748A1 (fr) * 2015-01-29 2016-08-04 日本ブレーキ工業株式会社 Composition de matériau de friction et matériau de friction et élément de friction utilisant la composition de matériau de friction
JP2016145274A (ja) * 2015-02-06 2016-08-12 日本ブレーキ工業株式会社 摩擦材および摩擦部材

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* Cited by examiner, † Cited by third party
Title
See also references of EP3327099A4 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110382654A (zh) * 2017-03-06 2019-10-25 日立化成株式会社 摩擦材料组合物、摩擦材料以及摩擦构件
US11649869B2 (en) 2017-03-06 2023-05-16 Resonac Corporation Friction material composition, friction material, and friction member
CN109723740A (zh) * 2019-01-18 2019-05-07 北京浦然轨道交通科技有限公司 一种耐高温的合成制动闸片及其制备方法
CN109723740B (zh) * 2019-01-18 2020-06-26 北京浦然轨道交通科技有限公司 一种耐高温的合成制动闸片及其制备方法
WO2021246213A1 (fr) * 2020-06-02 2021-12-09 住友ベークライト株式会社 Composition de résine phénolique pour matériau de friction
JPWO2021246213A1 (fr) * 2020-06-02 2021-12-09
JP7131713B2 (ja) 2020-06-02 2022-09-06 住友ベークライト株式会社 摩擦材用フェノール樹脂組成物

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