WO2023085286A1 - Matériau de frottement - Google Patents

Matériau de frottement Download PDF

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Publication number
WO2023085286A1
WO2023085286A1 PCT/JP2022/041612 JP2022041612W WO2023085286A1 WO 2023085286 A1 WO2023085286 A1 WO 2023085286A1 JP 2022041612 W JP2022041612 W JP 2022041612W WO 2023085286 A1 WO2023085286 A1 WO 2023085286A1
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WO
WIPO (PCT)
Prior art keywords
friction material
friction
mass
hexametaphosphate
less
Prior art date
Application number
PCT/JP2022/041612
Other languages
English (en)
Japanese (ja)
Inventor
博司 山本
素行 宮道
裕太 渡辺
健太郎 大輪
健太 木村
Original Assignee
曙ブレーキ工業株式会社
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
Application filed by 曙ブレーキ工業株式会社 filed Critical 曙ブレーキ工業株式会社
Publication of WO2023085286A1 publication Critical patent/WO2023085286A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • 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 materials used in automobiles, railway vehicles, industrial machinery, and the like.
  • Patent Document 1 discloses the use of porous inorganic particles that have the ability to adsorb sulfate ions, which are the cause of rust adhesion, as a friction modifier.
  • the present invention has been made in view of the above-mentioned conventional circumstances, and the problem to be solved is to provide a friction material that can sufficiently suppress rust adhesion.
  • rust adhesion can be sufficiently suppressed by including cashew particles and hexametaphosphate having an eluted sulfate ion amount of 500 ppm or less in the friction material.
  • the present invention has been completed.
  • the present invention relates to the following ⁇ 1> to ⁇ 3>.
  • a friction material containing a friction modifier, a binder and a fiber base material A friction material containing cashew particles having an eluted sulfate ion amount of 500 ppm or less and hexametaphosphate as the friction modifier.
  • ⁇ 3> The friction material according to ⁇ 1> or ⁇ 2>, wherein the hexametaphosphate is sodium hexametaphosphate.
  • the friction material of this embodiment can sufficiently suppress rust adhesion.
  • the friction material of this embodiment includes a friction modifier, a binder and a fibrous base material. Each component will be described in detail below.
  • the friction material of the present embodiment contains cashew particles having an eluted sulfate ion amount of 500 ppm or less and hexametaphosphate as friction modifiers.
  • Cashew particles are obtained by pulverizing polymerized and hardened cashew nut shell oil, and are sometimes called cashew dust.
  • the amount of eluted sulfate ions in the cashew particles used in this embodiment is 500 ppm or less.
  • cashew particles having an eluted sulfate ion amount of 500 ppm or less are included in the friction material of the present embodiment, the amount of sulfate ions eluted in water, which is the cause of rust adhesion, can be reduced, and as a result, rust adhesion is suppressed. be done.
  • the amount of eluted sulfate ions in the cashew particles used in this embodiment is preferably 400 ppm or less, more preferably 300 ppm or less, and even more preferably 200 ppm or less, from the viewpoint of rust adhesion suppression.
  • ppm means “mass ppm”.
  • amount of eluted sulfate ions in cashew particles can be measured according to, for example, "JIS K 0102:2019 Annex 1 Barium sulfate turbidimetric method for sulfate ions”.
  • the cashew particles having the predetermined amount of eluted sulfate ions can be obtained, for example, by adjusting the amount of acid catalyst remaining in the cashew particles. Moreover, you may use a commercial item.
  • the content of cashew particles in the entire friction material is preferably 1.0 to 7.0% by mass, more preferably 1.0 to 6.0% by mass, and still more preferably 1.0% by mass, from the viewpoint of suppressing rust adhesion. ⁇ 5.0% by mass.
  • content of cashew particles is 1.0% by mass or more, flexibility can be imparted to the friction material while maintaining the effect of suppressing rust adhesion.
  • content of cashew particles is 7.0% by mass or less, the heat resistance of the friction material is improved and the amount of eluted sulfate ions in the friction material is reduced, making it easier to obtain the effect of inhibiting rust adhesion.
  • the average particle size of the cashew particles is preferably 10-500 ⁇ m, more preferably 100-300 ⁇ m. If the cashew particles have an average particle size of 10 ⁇ m or more, they can be uniformly dispersed in the friction material, form an appropriate transfer film, and stabilize the friction coefficient. If the cashew particles have an average particle size of 500 ⁇ m or less, the strength and durability of the friction material will be good.
  • the friction material of this embodiment contains hexametaphosphate as a friction modifier.
  • the wear powder agglomerates to form a wear powder agglomerate. Agglomerates of the abrasion powder are the starting points to generate rust and increase the fixing force. It is presumed that the inclusion of hexametaphosphate in the friction material of the present embodiment suppresses the formation of wear powder aggregates, and thus suppresses rust adhesion.
  • hexametaphosphate examples include sodium hexametaphosphate, potassium hexametaphosphate, and ammonium hexametaphosphate.
  • sodium hexametaphosphate is preferable from the viewpoint of suppressing rust adhesion.
  • the content of the hexametaphosphate in the entire friction material is preferably 0.1 to 2.0% by mass, more preferably 0.3 to 1.7% by mass, and still more preferably 0.1% to 2.0% by mass, from the viewpoint of suppressing rust adhesion. It is 5 to 1.5% by mass.
  • the average particle size of hexametaphosphate is preferably 1-200 ⁇ m, more preferably 5-100 ⁇ m. If the average particle size of the hexametaphosphate is 1 ⁇ m or more, the reaction with moisture will be good. When the average particle size of the hexametaphosphate is 200 ⁇ m or less, the moldability of the friction material is improved, and the mechanical strength can be improved.
  • the average particle size means a volume-based cumulative 50% equivalent particle size (median size) measured by a laser diffraction particle size distribution analyzer.
  • the average particle size can also be measured by a sieving method.
  • Examples of other friction modifiers include inorganic fillers, organic fillers, abrasives, solid lubricants, and metal powders.
  • inorganic fillers include inorganic materials such as titanate, barium sulfate, calcium carbonate, calcium hydroxide, vermiculite, and mica. These may be used alone or in combination of two or more.
  • the inorganic filler, together with the hexametaphosphate, is preferably used in an amount of 3 to 40% by mass, more preferably 5 to 30% by mass, of the total friction material.
  • organic fillers examples include various rubber powders (raw rubber powder, tire powder, etc.), cashew dust, tire tread, melamine dust, and the like. These may be used alone or in combination of two or more.
  • the organic filler is preferably used in an amount of 1 to 20 mass%, more preferably 3 to 15 mass% of the total friction material together with the cashew particles.
  • abrasives examples include alumina, silica, magnesium oxide, zirconia, zirconium silicate, chromium oxide, triiron tetraoxide (Fe 3 O 4 ), and chromite. These may be used alone or in combination of two or more.
  • the abrasive is preferably used in an amount of 1 to 20 mass%, more preferably 3 to 15 mass% of the total friction material.
  • Solid lubricants include graphite, coke, antimony trisulfide, molybdenum disulfide, tin sulfide, and polytetrafluoroethylene (PTFE). These may be used alone or in combination of two or more.
  • the solid lubricant is preferably used in an amount of 5 to 40% by mass, more preferably 10 to 30% by mass, based on the total friction material.
  • metal powders examples include powders of aluminum, tin, and zinc. These are used singly or in combination of two or more.
  • the metal powder is preferably used in an amount of 1 to 10% by mass, more preferably 1 to 5% by mass, based on the total friction material.
  • the friction modifier is preferably used in an amount of 40 to 80% by mass, more preferably 50 to 70% by mass, of the total friction material.
  • binders various commonly used binders can be used. Specific examples include thermosetting resins such as phenolic resins, various modified phenolic resins such as elastomers, melamine resins, epoxy resins and polyimide resins.
  • elastomer-modified phenol resins examples include acrylic rubber-modified phenol resins, silicone rubber-modified phenol resins, and nitrile rubber (NBR)-modified phenol resins. These may be used alone or in combination of two or more.
  • the binder is preferably used in an amount of 1 to 20% by mass, more preferably 3 to 15% by mass, based on the total friction material.
  • fiber base material various commonly used fiber base materials can be used. Specific examples include organic fibers, inorganic fibers, and metal fibers.
  • organic fibers examples include aromatic polyamide (aramid) fibers and flame-resistant acrylic fibers.
  • inorganic fibers examples include biosoluble inorganic fibers, ceramic fibers, glass fibers, carbon fibers, and rock wool.
  • biosoluble inorganic fibers include biosoluble ceramic fibers such as SiO 2 —CaO—MgO fiber, SiO 2 —CaO—MgO—Al 2 O 3 fiber, SiO 2 —MgO—SrO fiber, and biosoluble ceramic fibers. Dissolving rock wool etc. are mentioned.
  • metal fibers examples include steel fibers. These may be used alone or in combination of two or more.
  • the fiber base material preferably accounts for 3 to 50% by mass, more preferably 5 to 40% by mass of the total friction material.
  • the friction material of the present invention preferably does not contain a copper component.
  • does not contain a copper component means that it does not contain a copper component as an effective component for exhibiting functions such as wear resistance. It does not mean that it does not contain any copper component as an impurity or the like. From the viewpoint of environmental load, it is preferable that the content of the copper component mixed as an impurity or the like is 0.5% by mass or less.
  • the friction material of the present embodiment can be manufactured by a known manufacturing process.
  • the above components are blended, and the blend is subjected to preforming, thermoforming, heating, polishing, etc. according to a normal manufacturing method to form a friction material. can be manufactured.
  • a method of manufacturing a brake pad with a friction material generally includes the following steps.
  • thermoforming process in which the plate and the plate are fixed together by applying a predetermined temperature and pressure (molding temperature 130 to 180 ° C., molding pressure 30 to 80 MPa, molding time 2 to 10 minutes) (e) After-curing (150 to 300°C, 1 to 5 hours), and finally finishing treatment such as polishing, scorching, and painting
  • Examples 1 to 10 Comparative Examples 1 to 15
  • the compounding materials shown in Tables 1 and 2 were collectively put into a mixing stirrer and mixed at room temperature for 5 minutes to obtain a mixture.
  • the resulting mixture was subjected to the following steps of preforming (i), thermoforming (ii), heating and scorching (iii) to produce a friction material.
  • the average particle sizes of cashew particles and sodium hexametaphosphate used as raw materials were 300 ⁇ m and 100 ⁇ m, respectively.
  • the rust adhesion strength (N) of each example obtained in the evaluation test was evaluated based on the following criteria. Tables 3 and 4 show the results. ⁇ : 0 N (no rust adhesion) to less than 5 N ⁇ : 5 N or more and less than 30 N ⁇ : 30 N or more and less than 60 N ⁇ : 60 N or more

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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

La présente invention concerne un matériau de frottement comprenant un modificateur de frottement, un liant et un matériau de base fibreux, le matériau de frottement contenant, en tant que modificateur de frottement, des particules de cajou et un hexamétaphosphate ayant des ions sulfate de lixiviation en une quantité de 500 ppm ou moins.
PCT/JP2022/041612 2021-11-10 2022-11-08 Matériau de frottement WO2023085286A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021183691 2021-11-10
JP2021-183691 2021-11-10

Publications (1)

Publication Number Publication Date
WO2023085286A1 true WO2023085286A1 (fr) 2023-05-19

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016125892A1 (fr) * 2015-02-06 2016-08-11 日本ブレーキ工業株式会社 Matériau de frottement et élément de frottement
CN106763366A (zh) * 2017-01-13 2017-05-31 安徽丰汇车业配件有限公司 一种品质稳定的刹车片摩擦块
WO2021079831A1 (fr) * 2019-10-25 2021-04-29 曙ブレーキ工業株式会社 Matériau de frottement
JP2021095487A (ja) * 2019-12-17 2021-06-24 住友ベークライト株式会社 樹脂材料、摩擦材、および樹脂材料の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016125892A1 (fr) * 2015-02-06 2016-08-11 日本ブレーキ工業株式会社 Matériau de frottement et élément de frottement
CN106763366A (zh) * 2017-01-13 2017-05-31 安徽丰汇车业配件有限公司 一种品质稳定的刹车片摩擦块
WO2021079831A1 (fr) * 2019-10-25 2021-04-29 曙ブレーキ工業株式会社 Matériau de frottement
JP2021095487A (ja) * 2019-12-17 2021-06-24 住友ベークライト株式会社 樹脂材料、摩擦材、および樹脂材料の製造方法

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