WO2014115594A1 - Friction material - Google Patents
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- WO2014115594A1 WO2014115594A1 PCT/JP2014/050409 JP2014050409W WO2014115594A1 WO 2014115594 A1 WO2014115594 A1 WO 2014115594A1 JP 2014050409 W JP2014050409 W JP 2014050409W WO 2014115594 A1 WO2014115594 A1 WO 2014115594A1
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- friction material
- friction
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Classifications
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- 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
- F16D69/025—Compositions based on an organic binder
- F16D69/026—Compositions based on an organic binder containing fibres
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- 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
- F16D2200/00—Materials; Production methods therefor
- F16D2200/006—Materials; Production methods therefor containing fibres or particles
- F16D2200/0073—Materials; Production methods therefor containing fibres or particles having lubricating properties
Definitions
- the present invention relates to a friction material obtained by molding a friction material composition of NAO (Non-Asbestos-Organic) material that does not contain a copper component and is 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 bonded to a metal or resin base member such as steel is used as the friction member.
- the friction material includes a semi-metallic friction material containing 30% by weight or more and less than 60% by weight of steel fiber as a fiber base material, and steel fiber in a part of the fiber base material. Are classified into a low steel friction material containing less than 30% by weight with respect to the total amount of the friction material composition, and a NAO material that does not include steel fibers such as steel fibers and stainless fibers as a fiber base material.
- copper components such as copper or copper alloy fibers or particles are essential components in order to satisfy strict required performance. About 0 to 20.0% by weight is added.
- Friction mechanism and thermal conductivity characteristics of copper components such as copper and copper alloy fibers or particles are indispensable for friction materials used in disc brake pads, but exclude copper components from friction materials As a result, it has become clear that various problems that have not existed before, such as problems that the friction coefficient stability, fade resistance, and wear resistance at high speeds and high loads are reduced.
- a binder is 12 to 24% by volume
- a fiber is 2 to 10% by volume
- at least one lubricant is 5% by volume or less
- at least one or more abrasives are 15 to 30% by volume.
- a brake friction material containing 10 to 24% by volume of at least one titanate and substantially free of copper and asbestos, that is, a friction material of NAO material containing no copper component is disclosed.
- the present invention provides a friction material that can ensure required performances of wear resistance and rust-fixing property in a friction material molded from a friction material composition of NAO material not containing a copper component, which is used for a disc brake pad. For the purpose.
- a friction material formed from a friction material composition of a NAO material that does not contain a copper component used for a disc brake pad is a metal as a binder, organic fiber, or lubricant.
- a friction material containing a specific amount of an inorganic friction modifier, an organic friction modifier, a pH adjuster of less than 5, a substance having a Mohs hardness of 8.0 or more, a simple metal other than copper, and an alloy other than a copper alloy The inventors have found that the above problems can be solved by using the composition, and have completed the present invention.
- the present invention is a friction material obtained by molding a friction material composition of NAO material that does not contain a copper component and is used for a disc brake pad, and is based on the following technique.
- the friction material composition includes 9.0 to 12 binders based on the total amount of the friction material composition. 0.0 wt%, 2.0 to 8.0 wt% of organic fiber with respect to the total amount of the friction material composition, and 0.5 to 7. wt. Of metal sulfide type lubricant as the lubricant with respect to the total amount of the friction material composition.
- wollastonite is 1.0 to 3.0 wt% with respect to the total amount of the friction material
- the particulate inorganic friction modifier with Mohs hardness of 4.5 or more and less than 8.0 is the total amount of the friction material composition.
- Zirconium oxide having an average particle size of 1.0 ⁇ m to 5.0 ⁇ m contained in the particulate inorganic friction modifier having a Mohs hardness of 4.5 or more and less than 8.0 is 5 with respect to the total amount of the friction material composition.
- Zirconium silicate having an average particle size of 10.0 to 15.0 ⁇ m in an amount of 0.0 to 20.0 wt% is 0.5 to 1.5 wt% based on the total amount of the friction material composition ( 1) Friction material.
- a friction material that can ensure wear resistance and rust-resistance adhesion in a friction material molded from a friction material composition of a NAO material that does not contain a copper component and is used for a disc brake pad.
- the binding material in the friction material obtained by molding the friction material composition containing no copper component used for the disc brake pad, is 9.0 to 12.0% by weight with respect to the total amount of the friction material composition,
- the organic fiber is 2.0 to 8.0% by weight based on the total amount of the friction material composition, and the metal sulfide-based lubricant is 0.5 to 7.0% by weight based on the total amount of the friction material composition.
- the quality lubricant is 2.0 to 6.0% by weight with respect to the total amount of the friction material composition
- the titanate is 8.0 to 35.0% by weight with respect to the total amount of the friction material composition.
- a particulate inorganic friction modifier having a wollastonite of 1.0 to 3.0% by weight based on the total amount of the friction material and a Mohs hardness of 4.5 or more and less than 8.0 is 11.
- the organic friction modifier is 3.0 to 8.0% by weight with respect to the total amount of the friction material composition
- the pH adjuster is 2.0% with respect to the total amount of the friction material composition.
- a friction material composition containing ⁇ 6.0% by weight, having a Mohs hardness of 8.0 or more, a simple metal other than copper, and an alloy other than a copper alloy is used.
- Binder organic fiber, metal sulfide lubricant, carbonaceous lubricant, titanate, wollastonite, particulate inorganic friction modifier with Mohs hardness of 4.5 to less than 8.0, Mohs hardness Inorganic friction modifiers, organic friction modifiers, and pH modifiers of less than 4.5 are in the above range, and a material having a Mohs hardness of 8.0 or more, a simple metal other than copper, and an alloy other than copper alloy are not included.
- the friction material composition the required performance of wear resistance and rust resistance is ensured in the friction material molded from the friction material composition of NAO material that does not contain copper component, which is used for disc brake pads.
- the friction material which can be provided can be provided.
- binder straight phenol resin, resin obtained by modifying phenol resin with various elastomers such as cashew oil, silicone oil, acrylic rubber, aralkyl modified phenol resin obtained by reacting phenols, aralkyl ethers and aldehydes
- elastomers such as cashew oil, silicone oil, acrylic rubber
- aralkyl modified phenol resin obtained by reacting phenols, aralkyl ethers and aldehydes
- the binder generally used for friction materials such as thermosetting resins in which various elastomers, fluoropolymers and the like are dispersed in a phenol resin can be used, and these can be used alone or in combination of two or more. .
- organic fibers examples include organic fibers that are commonly used in friction materials such as aramid fibers, cellulose fibers, poly-paraphenylenebenzobisoxazole fibers, and acrylic fibers. These may be used alone or in combination of two or more. Can be used.
- metal sulfide lubricant molybdenum disulfide, zinc sulfide, tin sulfide, composite metal sulfide, etc.
- carbonaceous lubricant friction materials such as graphite, petroleum coke, activated carbon, oxidized polyacrylonitrile fiber pulverized powder, etc.
- Lubricants usually used can be mentioned, and these can be used alone or in combination of two or more.
- the titanate preferably has a plate-like shape or an irregular shape having a plurality of convex portions, and is usually used for friction materials such as potassium titanate, lithium potassium titanate, and magnesium potassium titanate.
- a titanate is mentioned, These can be used individually by 1 type or in combination of 2 or more types.
- particulate inorganic friction modifier with Mohs hardness of 4.5 or more and less than 8.0, friction of triiron tetroxide, zeolite, calcium silicate hydrate, glass beads, magnesium oxide, zirconium oxide, zirconium silicate, etc.
- Particulate inorganic friction modifiers usually used for the material can be mentioned, and these can be used alone or in combination of two or more.
- inorganic friction modifiers having a Mohs hardness of less than 4.5 include inorganic friction modifiers commonly used in friction materials such as mica, calcined vermiculite, unfired vermiculite, talc, dolomite, and kaolin. It can use individually or in combination of 2 or more types.
- zirconium oxide having an average particle diameter of 1.0 ⁇ m to 5.0 ⁇ m is 5.0 to 5.0% based on the total amount of the friction material composition.
- Organic friction modifiers are usually used for friction materials such as cashew dust, pulverized tire tread rubber, vulcanized rubber powder such as nitrile rubber, acrylic rubber, silicone rubber, butyl rubber, or unvulcanized rubber powder.
- An adjusting material is mentioned, These can be used individually by 1 type or in combination of 2 or more types.
- Calcium hydroxide can be used as a pH adjusting material.
- a filler such as barium sulfate or calcium carbonate is used.
- the friction material composition of the present invention is characterized by not containing a substance having a Mohs hardness of 8.0 or more, a metal simple substance other than copper, and an alloy other than a copper alloy. Because it does not contain a material with a Mohs hardness of 8.0 or more, such as alumina or silicon carbide, the dynamic friction coefficient during service braking does not become too large, and the balance of braking force distribution with the front wheel brake is good. become. In addition, since it does not contain a single metal or an alloy having a large specific gravity, the raw material is not segregated during conveyance of the friction material mixture, and a homogeneous product can be provided.
- the friction material used in the disc brake of the present invention is separately mixed with the friction material raw material mixture obtained by mixing the friction material composition mixed in a predetermined amount uniformly using a mixer.
- a mixer Surface treatment, heat-pressing molding process in which a back plate coated with an adhesive is stacked and placed in a thermoforming mold, and heated and pressed to mold, and the resulting molded product is heated to complete the curing reaction of the binder It is manufactured through a heat treatment step and a polishing step for forming a friction surface.
- granulation obtained by granulation step of granulating friction material raw material mixture, kneading step of kneading friction material raw material mixture, friction material raw material mixture or granulation step before heating and pressure molding step The pre-molding process in which the kneaded product obtained in the kneading process is put into a pre-molding mold and the pre-molded product is molded is performed. After the heat and pressure molding process, the painting / paint baking process and the scorch process are performed.
- Friction material compositions having the compositions shown in Table 1 were mixed for 5 minutes with a Redige mixer, and pre-molded by pressing for 1 minute at 10 MPa in a molding die. 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.
- a friction material which is used for a disc brake pad and which is obtained by molding a friction material composition of a NAO material not containing a copper component can satisfy the required performance of wear resistance and rust resistance adhesion. It can be obtained and is of very high practical value.
Abstract
The present invention addresses the problem of providing a friction material with which the requisite properties of abrasion resistance and rust fixation resistance can be ensured, said friction material being obtained by moulding a friction material composition comprising a Cu-free non-asbestos-organic (NAO) material. This problem is solved by employing a friction material composition including: 9.0-12.0 weight% of a binder; 2.0-8.0 weight% of organic fibres; 0.5-7.0 weight% of a metallic-sulfide-based lubricant; 2.0-6.0 weight% of a carbonaceous lubricant; 8.0-35.0 weight% of titanate; 1.0-3.0 weight% of wollastonite; 11.0-27.0 weight% of a particulate inorganic friction adjustor having a Mohs' hardness of at least 4.5 but less than 8.0; 2.0-11.0 weight% of an inorganic friction adjustor having a Mohs' hardness of less than 4.5; 3.0-8.0 weight% of an organic friction adjustor; and 2.0-6.0 weight% of a pH adjustor. The friction material composition does not include: substances having a Mohs' hardness of equal to or more than 8.0; an elemental metal other than copper; and an alloy other than a copper alloy.
Description
本発明は、ディスクブレーキパッドに使用される、銅成分を含有しないＮＡＯ（Non-Asbestos-Organic）材の摩擦材組成物を成型した摩擦材に関する。
The present invention relates to a friction material obtained by molding a friction material composition of NAO (Non-Asbestos-Organic) material that does not contain a copper component and is used for a disc brake pad.
従来、乗用車の制動装置としてディスクブレーキが使用されており、その摩擦部材として鋼鉄等の金属製又は樹脂製のベース部材に摩擦材が貼り付けられたディスクブレーキパッドが使用されている。
Conventionally, a disc brake is used as a braking device for a passenger car, and a disc brake pad in which a friction material is bonded to a metal or resin base member such as steel is used as the friction member.
摩擦材は、繊維基材としてスチール繊維を摩擦材組成物全量に対し３０重量％以上６０重量％未満含有するセミメタリック摩擦材と、繊維基材の一部にスチール繊維を含み、且つ、スチール繊維を摩擦材組成物全量に対し３０重量％未満含有するロースチール摩擦材と、繊維基材としてスチール繊維やステンレス繊維等のスチール系繊維を含まないＮＡＯ材に分類されている。
The friction material includes a semi-metallic friction material containing 30% by weight or more and less than 60% by weight of steel fiber as a fiber base material, and steel fiber in a part of the fiber base material. Are classified into a low steel friction material containing less than 30% by weight with respect to the total amount of the friction material composition, and a NAO material that does not include steel fibers such as steel fibers and stainless fibers as a fiber base material.
ブレーキノイズの発生が少ない摩擦材が求められている近年においては、スチール系繊維を含まず、且つ、熱硬化性樹脂等の結合材、非鉄金属繊維、有機繊維などの繊維基材、潤滑材、無機摩擦調整材、有機摩擦調整材等の摩擦調整材から成る、ＮＡＯ材の摩擦材を使用したディスクブレーキパッドが広く使用されるようになってきている。
In recent years, there is a demand for friction materials that generate less brake noise.In addition, steel-based fibers are not included, and binders such as thermosetting resins, non-ferrous metal fibers, fiber base materials such as organic fibers, lubricants, Disc brake pads using a friction material such as an inorganic friction adjustment material, an organic friction adjustment material, or the like and using a friction material of NAO material have been widely used.
ディスクブレーキパッドに使用されるＮＡＯ材の摩擦材には、厳しい要求性能を満足するために銅や銅合金の繊維、又は粒子等の銅成分が必須成分として摩擦材組成物全量に対し、５．０～２０．０重量％程度添加されている。
In the friction material of NAO material used for a disc brake pad, copper components such as copper or copper alloy fibers or particles are essential components in order to satisfy strict required performance. About 0 to 20.0% by weight is added.
しかし近年、このような摩擦材は制動時に摩耗粉として銅を排出し、この排出された銅が河川、湖、海洋に流入することにより水域を汚染する可能性があることが示唆されている。
However, in recent years, it has been suggested that such friction materials may discharge copper as wear powder during braking, and the discharged copper may contaminate water areas by flowing into rivers, lakes, and oceans.
このような背景から、アメリカのカリフォルニア州、ワシントン州では、２０２１年以降、銅成分を５．０重量％以上含有する摩擦材を使用した摩擦部材の販売及び新車への組み付けを禁止し、２０２３年以降、銅成分を０．５重量％以上含有する摩擦材を使用した摩擦部材の販売及び新車への組み付けを禁止する法案が可決している。
Against this background, in California and Washington, USA, sales of friction materials using friction materials containing copper components of 5.0% by weight or more and assembly into new cars have been prohibited since 2021. Since then, there has been a bill that prohibits the sale of friction members using friction materials containing 0.5% by weight or more of copper components and the assembly into new cars.
そして、今後このような規制は世界中に波及するものと予想されることから、銅成分を含有しない摩擦材の開発が急務となっている。
And since such regulations are expected to spread all over the world in the future, it is urgent to develop friction materials that do not contain copper components.
銅や銅合金の繊維又は粒子等の銅成分が持つ摩擦メカニズム、熱伝導性等の特性はディスクブレーキパッドに使用される摩擦材には欠かせないものであるが、摩擦材から銅成分を排除することにより、これまでになかった様々な問題、例えば高速・高負荷時での摩擦係数の安定性、耐フェード性、耐摩耗性が低下するという問題が生じることが明らかとなってきた。
Friction mechanism and thermal conductivity characteristics of copper components such as copper and copper alloy fibers or particles are indispensable for friction materials used in disc brake pads, but exclude copper components from friction materials As a result, it has become clear that various problems that have not existed before, such as problems that the friction coefficient stability, fade resistance, and wear resistance at high speeds and high loads are reduced.
一方、近年では後輪のディスクブレーキとして特許文献１のような流体式サービスブレーキ装置に電動パーキング機能を付加したタイプのディスクブレーキが採用され始めている。このようなタイプのディスクブレーキにおいては、パーキングブレーキ時にディスクロータと摩擦材が錆によって固着する、所謂、錆固着の発生が問題となってきており、耐錆固着性も要求されてきている。
On the other hand, in recent years, a disc brake of a type in which an electric parking function is added to a fluid service brake device as in Patent Document 1 has begun to be adopted as a disc brake for a rear wheel. In such a type of disc brake, the so-called rust sticking, in which the disc rotor and the friction material stick together by rust at the time of parking brake, has become a problem, and rust-resistant sticking has also been required.
特許文献２には、結合材を１２～２４体積％、繊維を２～１０体積％、少なくとも１種の潤滑材を５体積％以下、少なくとも１種またはそれ以上の研削材を１５～３０体積％、少なくとも１種のチタン酸塩を１０～２４体積％含有し、銅と石綿を実質的に含有しないブレーキ用摩擦材、即ち、銅成分を含有しないＮＡＯ材の摩擦材が開示されている。
In Patent Document 2, a binder is 12 to 24% by volume, a fiber is 2 to 10% by volume, at least one lubricant is 5% by volume or less, and at least one or more abrasives are 15 to 30% by volume. A brake friction material containing 10 to 24% by volume of at least one titanate and substantially free of copper and asbestos, that is, a friction material of NAO material containing no copper component is disclosed.
しかし、特許文献２に記載の摩擦材は銅成分を含有しないという点で上記の法規を満足しているが、耐摩耗性、耐錆固着性の要求性能を十分に確保しているとは言えない。
However, although the friction material described in Patent Document 2 satisfies the above-mentioned laws and regulations in that it does not contain a copper component, it can be said that the required performance of wear resistance and rust-resistant adhesion is sufficiently ensured. Absent.
本発明は、ディスクブレーキパッドに使用される、銅成分を含有しないＮＡＯ材の摩擦材組成物を成型した摩擦材において、耐摩耗性、耐錆固着性の要求性能を確保できる摩擦材を提供することを目的とする。
The present invention provides a friction material that can ensure required performances of wear resistance and rust-fixing property in a friction material molded from a friction material composition of NAO material not containing a copper component, which is used for a disc brake pad. For the purpose.
本発明者らは、鋭意検討を重ねた結果、ディスクブレーキパッドに使用される、銅成分を含有しないＮＡＯ材の摩擦材組成物を成型した摩擦材において、結合材、有機繊維、潤滑材として金属硫化物系潤滑材，炭素質系潤滑材、チタン酸塩、無機摩擦調整材としてウォラストナイト，モース硬度が４．５以上で８．０未満の粒子状無機摩擦調整材，モース硬度が４．５未満の無機摩擦調整材、有機摩擦調整材、ｐＨ調整材を特定量含有し、モース硬度が８．０以上の物質と、銅以外の金属単体と、銅合金以外の合金を含有しない摩擦材組成物を使用することにより上記課題を解決できることを知見し、本発明を完成した。
As a result of intensive studies, the present inventors have found that a friction material formed from a friction material composition of a NAO material that does not contain a copper component used for a disc brake pad is a metal as a binder, organic fiber, or lubricant. Sulfide lubricant, carbonaceous lubricant, titanate, inorganic friction modifier as wollastonite, particulate inorganic friction modifier with Mohs hardness of 4.5 or more and less than 8.0, Mohs hardness of 4. A friction material containing a specific amount of an inorganic friction modifier, an organic friction modifier, a pH adjuster of less than 5, a substance having a Mohs hardness of 8.0 or more, a simple metal other than copper, and an alloy other than a copper alloy The inventors have found that the above problems can be solved by using the composition, and have completed the present invention.
本発明は、ディスクブレーキパッドに使用される、銅成分を含有しないＮＡＯ材の摩擦材組成物を成型した摩擦材であって、以下の技術を基礎とするものである。
The present invention is a friction material obtained by molding a friction material composition of NAO material that does not contain a copper component and is used for a disc brake pad, and is based on the following technique.
（１）ディスクブレーキパッドに使用される、銅成分を含有しない摩擦材組成物を成型した摩擦材において、前記摩擦材組成物は、結合材を摩擦材組成物全量に対して９．０～１２．０重量％、有機繊維を摩擦材組成物全量に対して２．０～８．０重量％、潤滑材として金属硫化物系潤滑材を摩擦材組成物全量に対して０．５～７．０重量％，炭素質系潤滑材を摩擦材組成物全量に対して２．０～６．０重量％、チタン酸塩を摩擦材組成物全量に対して８．０～３５．０重量％、無機摩擦調整材としてウォラストナイトを摩擦材全量に対して１．０～３．０重量％，モース硬度が４．５以上で８．０未満の粒子状無機摩擦調整材を摩擦材組成物全量に対して１１．０～２７．０重量％，モース硬度が４．５未満の無機摩擦調整材を摩擦材組成物全量に対して２．０～１１．０重量％、有機摩擦調整材を摩擦材組成物全量に対して３．０～８．０重量％、ｐＨ調整材を摩擦材組成物全量に対して２．０～６．０重量％を含有し、モース硬度が８．０以上の物質と、銅以外の金属単体と、銅合金以外の合金を含有しないことを特徴とする摩擦材。
(1) In a friction material obtained by molding a friction material composition that does not contain a copper component and is used for a disc brake pad, the friction material composition includes 9.0 to 12 binders based on the total amount of the friction material composition. 0.0 wt%, 2.0 to 8.0 wt% of organic fiber with respect to the total amount of the friction material composition, and 0.5 to 7. wt. Of metal sulfide type lubricant as the lubricant with respect to the total amount of the friction material composition. 0% by weight, 2.0 to 6.0% by weight of the carbonaceous lubricant based on the total amount of the friction material composition, and 8.0 to 35.0% by weight of titanate based on the total amount of the friction material composition, As the inorganic friction modifier, wollastonite is 1.0 to 3.0 wt% with respect to the total amount of the friction material, and the particulate inorganic friction modifier with Mohs hardness of 4.5 or more and less than 8.0 is the total amount of the friction material composition. 11.0 to 27.0% by weight of inorganic friction modifier with Mohs hardness of less than 4.5 2.0 to 11.0% by weight with respect to the total amount, 3.0 to 8.0% by weight of the organic friction modifier with respect to the total amount of the friction material composition, and 2% of the pH adjuster with respect to the total amount of the friction material composition. A friction material containing 0.0 to 6.0% by weight, having a Mohs hardness of 8.0 or more, a simple metal other than copper, and an alloy other than a copper alloy.
（２）モース硬度が４．５以上で８．０未満の粒子状無機摩擦調整材に含まれる、平均粒子径が１．０μｍ～５．０μｍの酸化ジルコニウムを摩擦材組成物全量に対して５．０～２０．０重量％、平均粒子径が１０．０μｍ～１５．０μｍのケイ酸ジルコニウムを摩擦材組成物全量に対して０．５～１．５重量％とすることを特徴とする（１）の摩擦材。
(2) Zirconium oxide having an average particle size of 1.0 μm to 5.0 μm contained in the particulate inorganic friction modifier having a Mohs hardness of 4.5 or more and less than 8.0 is 5 with respect to the total amount of the friction material composition. Zirconium silicate having an average particle size of 10.0 to 15.0 μm in an amount of 0.0 to 20.0 wt% is 0.5 to 1.5 wt% based on the total amount of the friction material composition ( 1) Friction material.
本発明によれば、ディスクブレーキパッドに使用される、銅成分を含有しないＮＡＯ材の摩擦材組成物を成型した摩擦材において、耐摩耗性、耐錆固着性を確保できる摩擦材を提供できる。
According to the present invention, it is possible to provide a friction material that can ensure wear resistance and rust-resistance adhesion in a friction material molded from a friction material composition of a NAO material that does not contain a copper component and is used for a disc brake pad.
本発明においては、ディスクブレーキパッドに使用される、銅成分を含有しない摩擦材組成物を成型した摩擦材において、結合材を摩擦材組成物全量に対して９．０～１２．０重量％、有機繊維を摩擦材組成物全量に対して２．０～８．０重量％、潤滑材として金属硫化物系潤滑材を摩擦材組成物全量に対して０．５～７．０重量％，炭素質系潤滑材を摩擦材組成物全量に対して２．０～６．０重量％、チタン酸塩を摩擦材組成物全量に対して８．０～３５．０重量％、無機摩擦調整材としてウォラストナイトを摩擦材全量に対して１．０～３．０重量％，モース硬度が４．５以上で８．０未満の粒子状無機摩擦調整材を摩擦材組成物全量に対して１１．０～２７．０重量％，モース硬度が４．５未満の無機摩擦調整材を摩擦材組成物全量に対して２．０～１１．０重量％、有機摩擦調整材を摩擦材組成物全量に対して３．０～８．０重量％、ｐＨ調整材を摩擦材組成物全量に対して２．０～６．０重量％を含有し、モース硬度が８．０以上の物質と、銅以外の金属単体と、銅合金以外の合金を含有しない摩擦材組成物を使用する。
In the present invention, in the friction material obtained by molding the friction material composition containing no copper component used for the disc brake pad, the binding material is 9.0 to 12.0% by weight with respect to the total amount of the friction material composition, The organic fiber is 2.0 to 8.0% by weight based on the total amount of the friction material composition, and the metal sulfide-based lubricant is 0.5 to 7.0% by weight based on the total amount of the friction material composition. As the inorganic friction modifier, the quality lubricant is 2.0 to 6.0% by weight with respect to the total amount of the friction material composition, and the titanate is 8.0 to 35.0% by weight with respect to the total amount of the friction material composition. A particulate inorganic friction modifier having a wollastonite of 1.0 to 3.0% by weight based on the total amount of the friction material and a Mohs hardness of 4.5 or more and less than 8.0 is 11. Inorganic friction modifier with 0-27.0% by weight and Mohs hardness of less than 4.5 2.0 to 11.0% by weight, the organic friction modifier is 3.0 to 8.0% by weight with respect to the total amount of the friction material composition, and the pH adjuster is 2.0% with respect to the total amount of the friction material composition. A friction material composition containing ˜6.0% by weight, having a Mohs hardness of 8.0 or more, a simple metal other than copper, and an alloy other than a copper alloy is used.
結合材、有機繊維、金属硫化物系潤滑材、炭素質系潤滑材、チタン酸塩、ウォラストナイト、モース硬度が４．５以上で８．０未満の粒子状無機摩擦調整材、モース硬度が４．５未満の無機摩擦調整材、有機摩擦調整材、ｐＨ調整材を上記の範囲とし、モース硬度が８．０以上の物質と、銅以外の金属単体と、銅合金以外の合金を含有しない摩擦材組成物を使用することにより、ディスクブレーキパッドに使用される、銅成分を含有しないＮＡＯ材の摩擦材組成物を成型した摩擦材において、耐摩耗性、耐錆固着性の要求性能を確保できる摩擦材を提供することができる。
Binder, organic fiber, metal sulfide lubricant, carbonaceous lubricant, titanate, wollastonite, particulate inorganic friction modifier with Mohs hardness of 4.5 to less than 8.0, Mohs hardness Inorganic friction modifiers, organic friction modifiers, and pH modifiers of less than 4.5 are in the above range, and a material having a Mohs hardness of 8.0 or more, a simple metal other than copper, and an alloy other than copper alloy are not included. By using the friction material composition, the required performance of wear resistance and rust resistance is ensured in the friction material molded from the friction material composition of NAO material that does not contain copper component, which is used for disc brake pads. The friction material which can be provided can be provided.
結合材として、ストレートフェノール樹脂や、フェノール樹脂をカシューオイルやシリコーンオイル、アクリルゴム等の各種エラストマーで変性した樹脂、フェノール類とアラルキルエーテル類とアルデヒド類とを反応させて得られるアラルキル変性フェノール樹脂、フェノール樹脂に各種エラストマー、フッ素ポリマー等を分散させた熱硬化性樹脂等の摩擦材に通常用いられる結合材が挙げられ、これらは１種を単独で又は２種以上を組み合わせて使用することができる。
As a binder, straight phenol resin, resin obtained by modifying phenol resin with various elastomers such as cashew oil, silicone oil, acrylic rubber, aralkyl modified phenol resin obtained by reacting phenols, aralkyl ethers and aldehydes, Examples of the binder generally used for friction materials such as thermosetting resins in which various elastomers, fluoropolymers and the like are dispersed in a phenol resin can be used, and these can be used alone or in combination of two or more. .
有機繊維として、アラミド繊維、セルロース繊維、ポリ-パラフェニレンベンゾビスオキサゾール繊維、アクリル繊維等の摩擦材に通常使用される有機繊維が挙げられ、これらは１種を単独で又は２種以上を組み合わせて用いることができる。
Examples of organic fibers include organic fibers that are commonly used in friction materials such as aramid fibers, cellulose fibers, poly-paraphenylenebenzobisoxazole fibers, and acrylic fibers. These may be used alone or in combination of two or more. Can be used.
金属硫化物系潤滑材として、二硫化モリブデン、硫化亜鉛、硫化錫、複合金属硫化物等や、炭素質系潤滑材として、グラファイト、石油コークス、活性炭、酸化ポリアクリロニトリル繊維粉砕粉等の摩擦材に通常使用される潤滑材が挙げられ、これらは１種を単独で又は２種以上を組み合わせて用いることができる。
As a metal sulfide lubricant, molybdenum disulfide, zinc sulfide, tin sulfide, composite metal sulfide, etc., and as a carbonaceous lubricant, friction materials such as graphite, petroleum coke, activated carbon, oxidized polyacrylonitrile fiber pulverized powder, etc. Lubricants usually used can be mentioned, and these can be used alone or in combination of two or more.
炭素質系潤滑材として、発錆の要因となる硫酸イオンを吸着する特性を持つ活性炭を摩擦材組成物全量に対し０．５～２．０重量％添加すると、耐錆固着性がより向上するので好ましい。
Addition of 0.5 to 2.0% by weight of activated carbon, which has the property of adsorbing sulfate ions, which cause rusting, as a carbonaceous lubricant, improves the rust-proof adhesion more when added to the friction material composition by 0.5 to 2.0 wt%. Therefore, it is preferable.
チタン酸塩としては、板状の形状や、複数の凸部を有する不定形の形状をしたものが好ましく、チタン酸カリウム、チタン酸リチウムカリウム、チタン酸マグネシウムカリウム等の摩擦材に通常使用されるチタン酸塩が挙げられ、これらは１種を単独で又は２種以上を組み合わせて用いることができる。
The titanate preferably has a plate-like shape or an irregular shape having a plurality of convex portions, and is usually used for friction materials such as potassium titanate, lithium potassium titanate, and magnesium potassium titanate. A titanate is mentioned, These can be used individually by 1 type or in combination of 2 or more types.
モース硬度が４．５以上で８．０未満の粒子状無機摩擦調整材として、四三酸化鉄、ゼオライト、ケイ酸カルシウム水和物、ガラスビーズ、酸化マグネシウム、酸化ジルコニウム、ケイ酸ジルコニウム等の摩擦材に通常使用される粒子状無機摩擦調整材が挙げられ、これらは１種を単独で又は２種以上を組み合わせて用いることができる。
As a particulate inorganic friction modifier with Mohs hardness of 4.5 or more and less than 8.0, friction of triiron tetroxide, zeolite, calcium silicate hydrate, glass beads, magnesium oxide, zirconium oxide, zirconium silicate, etc. Particulate inorganic friction modifiers usually used for the material can be mentioned, and these can be used alone or in combination of two or more.
モース硬度が４．５未満の無機摩擦調整材として、マイカ、焼成バーミキュライト、未焼成バーミキュライト、タルク、ドロマイト、カオリン等の摩擦材に通常使用される無機摩擦調整材が挙げられ、これらは１種を単独で又は２種以上を組み合わせて用いることができる。
Examples of inorganic friction modifiers having a Mohs hardness of less than 4.5 include inorganic friction modifiers commonly used in friction materials such as mica, calcined vermiculite, unfired vermiculite, talc, dolomite, and kaolin. It can use individually or in combination of 2 or more types.
特に、モース硬度が４．５以上で８．０未満の粒子状無機摩擦調整材として、平均粒子径が１．０μｍ～５．０μｍの酸化ジルコニウムを摩擦材組成物全量に対して５．０～２０．０重量％と、平均粒子径が１０．０μｍ～１５．０μｍのケイ酸ジルコニウムを摩擦材組成物全量に対して０．５～１．５重量％添加することにより、耐摩耗性、耐錆固着性がより向上するので好ましい。
In particular, as a particulate inorganic friction modifier having a Mohs hardness of 4.5 or more and less than 8.0, zirconium oxide having an average particle diameter of 1.0 μm to 5.0 μm is 5.0 to 5.0% based on the total amount of the friction material composition. By adding 0.5 to 1.5% by weight of zirconium silicate having an average particle diameter of 20.0% by weight and an average particle size of 10.0 to 15.0 μm with respect to the total amount of the friction material composition, wear resistance, It is preferable because rust adhesion is further improved.
なお、本発明においては、平均粒子径として、レーザー回折粒度分布法により測定した５０％粒径の数値を用いた。
In the present invention, a numerical value of 50% particle diameter measured by the laser diffraction particle size distribution method was used as the average particle diameter.
有機摩擦調整材として、カシューダスト、タイヤトレッドゴムの粉砕粉や、ニトリルゴム、アクリルゴム、シリコーンゴム、ブチルゴム等の加硫ゴム粉末または未加硫ゴム粉末等の摩擦材に通常使用される有機摩擦調整材が挙げられ、これらは１種を単独で又は２種以上を組み合わせて用いることができる。
Organic friction modifiers are usually used for friction materials such as cashew dust, pulverized tire tread rubber, vulcanized rubber powder such as nitrile rubber, acrylic rubber, silicone rubber, butyl rubber, or unvulcanized rubber powder. An adjusting material is mentioned, These can be used individually by 1 type or in combination of 2 or more types.
ｐＨ調整材として水酸化カルシウムを使用することができる。
Calcium hydroxide can be used as a pH adjusting material.
摩擦材組成物の残部としては、硫酸バリウム、炭酸カルシウム等の充填材を使用する。
As the balance of the friction material composition, a filler such as barium sulfate or calcium carbonate is used.
また、本発明の摩擦材組成物は、モース硬度が８．０以上の物質と、銅以外の金属単体と、銅合金以外の合金を含有しないことを特徴とする。アルミナや、炭化ケイ素等のモース硬度が８．０以上の物質を含有しないので、サービスブレーキ時の動的な摩擦係数が大きくなり過ぎることがなく、前輪のブレーキとの制動力配分のバランスが良好になる。また、比重の大きな金属単体および合金を含有しないので、摩擦材原料混合物の搬送時において、原料が偏析することがなく、均質な製品を提供できる。
Further, the friction material composition of the present invention is characterized by not containing a substance having a Mohs hardness of 8.0 or more, a metal simple substance other than copper, and an alloy other than a copper alloy. Because it does not contain a material with a Mohs hardness of 8.0 or more, such as alumina or silicon carbide, the dynamic friction coefficient during service braking does not become too large, and the balance of braking force distribution with the front wheel brake is good. become. In addition, since it does not contain a single metal or an alloy having a large specific gravity, the raw material is not segregated during conveyance of the friction material mixture, and a homogeneous product can be provided.
本発明のディスクブレーキに使用される摩擦材は、所定量配合した上記の摩擦材組成物を、混合機を用いて均一に混合する混合工程、得られた摩擦材原料混合物と、別途、予め洗浄、表面処理、接着材を塗布したバックプレートを重ねて熱成形型に投入し、加熱加圧して成型する加熱加圧成型工程、得られた成型品を加熱して結合材の硬化反応を完了させる熱処理工程、摩擦面を形成する研磨処理工程を経て製造される。
The friction material used in the disc brake of the present invention is separately mixed with the friction material raw material mixture obtained by mixing the friction material composition mixed in a predetermined amount uniformly using a mixer. , Surface treatment, heat-pressing molding process in which a back plate coated with an adhesive is stacked and placed in a thermoforming mold, and heated and pressed to mold, and the resulting molded product is heated to complete the curing reaction of the binder It is manufactured through a heat treatment step and a polishing step for forming a friction surface.
必要に応じて、加熱加圧成型工程の前に、摩擦材原料混合物を造粒する造粒工程、摩擦材原料混合物を混練する混練工程、摩擦材原料混合物または造粒工程で得られた造粒物、混練工程で得られた混練物を予備成型型に投入し、予備成型物を成型する予備成型工程が実施され、加熱加圧成型工程の後に、塗装・塗装焼き付け工程、スコーチ工程が実施される。
If necessary, granulation obtained by granulation step of granulating friction material raw material mixture, kneading step of kneading friction material raw material mixture, friction material raw material mixture or granulation step before heating and pressure molding step The pre-molding process in which the kneaded product obtained in the kneading process is put into a pre-molding mold and the pre-molded product is molded is performed. After the heat and pressure molding process, the painting / paint baking process and the scorch process are performed. The
以下、実施例及び比較例を示し、本発明を具体的に説明するが、本発明は下記の実施例に制限されるものではない。
［実施例１～８・比較例１～３の摩擦材の製造方法］
表１に示す組成の摩擦材組成物をレディゲミキサーにて５分間混合し、成型金型内で１０ＭＰaにて１分加圧して予備成型をした。この予備成型物を、予め洗浄、表面処理、接着材を塗布した鋼鉄製のバックプレート上に重ね、熱成型型内で成型温度１５０℃、成型圧力４０ＭＰaの条件下で１０分間成型した後、２００℃で５時間熱処理（後硬化）を行い、研磨して乗用車用ディスクブレーキパッドを作製した（実施例１～８、比較例１～３）。
得られた摩擦材において、耐摩耗性、耐錆固着性を評価した。評価結果を表２に、評価基準を表３に示す。 EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.
[Methods for producing friction materials of Examples 1 to 8 and Comparative Examples 1 to 3]
Friction material compositions having the compositions shown in Table 1 were mixed for 5 minutes with a Redige mixer, and pre-molded by pressing for 1 minute at 10 MPa in a molding die. 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, followed by polishing to produce passenger car disc brake pads (Examples 1 to 8, Comparative Examples 1 to 3).
The obtained friction material was evaluated for wear resistance and rust-resistant adhesion. The evaluation results are shown in Table 2, and the evaluation criteria are shown in Table 3.
［実施例１～８・比較例１～３の摩擦材の製造方法］
表１に示す組成の摩擦材組成物をレディゲミキサーにて５分間混合し、成型金型内で１０ＭＰaにて１分加圧して予備成型をした。この予備成型物を、予め洗浄、表面処理、接着材を塗布した鋼鉄製のバックプレート上に重ね、熱成型型内で成型温度１５０℃、成型圧力４０ＭＰaの条件下で１０分間成型した後、２００℃で５時間熱処理（後硬化）を行い、研磨して乗用車用ディスクブレーキパッドを作製した（実施例１～８、比較例１～３）。
得られた摩擦材において、耐摩耗性、耐錆固着性を評価した。評価結果を表２に、評価基準を表３に示す。 EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.
[Methods for producing friction materials of Examples 1 to 8 and Comparative Examples 1 to 3]
Friction material compositions having the compositions shown in Table 1 were mixed for 5 minutes with a Redige mixer, and pre-molded by pressing for 1 minute at 10 MPa in a molding die. 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, followed by polishing to produce passenger car disc brake pads (Examples 1 to 8, Comparative Examples 1 to 3).
The obtained friction material was evaluated for wear resistance and rust-resistant adhesion. The evaluation results are shown in Table 2, and the evaluation criteria are shown in Table 3.
本発明によれば、ディスクブレーキパッドに使用される、銅成分を含有しないＮＡＯ材の摩擦材組成物を成型した摩擦材において、耐摩耗性、耐錆固着性の要求性能を満足できる摩擦材を得ることができ、きわめて実用的価値の高いものである。
According to the present invention, a friction material which is used for a disc brake pad and which is obtained by molding a friction material composition of a NAO material not containing a copper component, can satisfy the required performance of wear resistance and rust resistance adhesion. It can be obtained and is of very high practical value.
According to the present invention, a friction material which is used for a disc brake pad and which is obtained by molding a friction material composition of a NAO material not containing a copper component, can satisfy the required performance of wear resistance and rust resistance adhesion. It can be obtained and is of very high practical value.
Claims (2)
- ディスクブレーキパッドに使用される、銅成分を含有しない摩擦材組成物を成型した摩擦材において、
前記摩擦材組成物は、
結合材を摩擦材組成物全量に対して９．０～１２．０重量％、
有機繊維を摩擦材組成物全量に対して２．０～８．０重量％、
潤滑材として
金属硫化物系潤滑材を摩擦材組成物全量に対して０．５～７．０重量％，
炭素質系潤滑材を摩擦材組成物全量に対して２．０～６．０重量％、
チタン酸塩を摩擦材組成物全量に対して８．０～３５．０重量％、
無機摩擦調整材として
ウォラストナイトを摩擦材全量に対して１．０～３．０重量％，
モース硬度が４．５以上で８．０未満の粒子状無機摩擦調整材を摩擦材組成物全量に対して１１．０～２７．０重量％，
モース硬度が４．５未満の無機摩擦調整材を摩擦材組成物全量に対して２．０～１１．０重量％、
有機摩擦調整材を摩擦材組成物全量に対して３．０～８．０重量％、
ｐＨ調整材を摩擦材組成物全量に対して２．０～６．０重量％を含有し、
モース硬度が８．０以上の物質と、銅以外の金属単体と、銅合金以外の合金を含有しないことを特徴とする摩擦材。 In a friction material molded from a friction material composition that does not contain a copper component used for a disc brake pad,
The friction material composition is
The binder is 9.0 to 12.0% by weight based on the total amount of the friction material composition,
2.0 to 8.0% by weight of organic fiber based on the total amount of the friction material composition,
As a lubricant, a metal sulfide-based lubricant is 0.5 to 7.0% by weight based on the total amount of the friction material composition,
The carbonaceous lubricant is 2.0 to 6.0% by weight based on the total amount of the friction material composition,
The titanate is 8.0 to 35.0% by weight based on the total amount of the friction material composition,
As an inorganic friction modifier, wollastonite is 1.0 to 3.0% by weight with respect to the total amount of friction material.
11.0 to 27.0% by weight of a particulate inorganic friction modifier having a Mohs hardness of 4.5 or more and less than 8.0, based on the total amount of the friction material composition,
An inorganic friction modifier having a Mohs hardness of less than 4.5 to 2.0 to 11.0% by weight based on the total amount of the friction material composition;
The organic friction modifier is 3.0 to 8.0% by weight based on the total amount of the friction material composition,
The pH adjuster is contained in an amount of 2.0 to 6.0% by weight based on the total amount of the friction material composition,
A friction material characterized by not containing a substance having a Mohs hardness of 8.0 or more, a simple metal other than copper, and an alloy other than a copper alloy. - モース硬度が４．５以上で８．０未満の粒子状無機摩擦調整材に含まれる、
平均粒子径が１．０μｍ～５．０μｍの酸化ジルコニウムを摩擦材組成物全量に対して５．０～２０．０重量％、
平均粒子径が１０．０μｍ～１５．０μｍのケイ酸ジルコニウムを摩擦材組成物全量に対して０．５～１．５重量％
とすることを特徴とする請求項１に記載の摩擦材。 Included in the particulate inorganic friction modifier having a Mohs hardness of 4.5 or more and less than 8.0,
Zirconium oxide having an average particle size of 1.0 μm to 5.0 μm is 5.0 to 20.0% by weight based on the total amount of the friction material composition,
Zirconium silicate having an average particle size of 10.0 μm to 15.0 μm is 0.5 to 1.5% by weight based on the total amount of the friction material composition.
The friction material according to claim 1, wherein:
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| WO2016017488A1 (en) * | 2014-08-01 | 2016-02-04 | 日清紡ブレーキ株式会社 | Friction material |
| WO2017014173A1 (en) * | 2015-07-22 | 2017-01-26 | 日清紡ブレーキ株式会社 | Friction material |
| JP2017025286A (en) * | 2015-07-22 | 2017-02-02 | 日清紡ブレーキ株式会社 | Friction material |
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| JP6753649B2 (en) * | 2015-02-06 | 2020-09-09 | 日本ブレーキ工業株式会社 | Friction materials and members |
| JP6753650B2 (en) * | 2015-02-20 | 2020-09-09 | 日本ブレーキ工業株式会社 | Friction materials and members |
| JP6596956B2 (en) * | 2015-06-12 | 2019-10-30 | 日立化成株式会社 | Friction material composition, and friction material and friction member using the same |
| US11448277B2 (en) | 2015-07-22 | 2022-09-20 | Nisshinbo Brake, Inc. | Friction material |
| JP2017141351A (en) * | 2016-02-10 | 2017-08-17 | 日立化成株式会社 | Friction material composition, friction material and friction member using the friction material composition |
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| WO2016017488A1 (en) * | 2014-08-01 | 2016-02-04 | 日清紡ブレーキ株式会社 | Friction material |
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