WO2014112440A1 - Friction material - Google Patents
Friction material Download PDFInfo
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- WO2014112440A1 WO2014112440A1 PCT/JP2014/050350 JP2014050350W WO2014112440A1 WO 2014112440 A1 WO2014112440 A1 WO 2014112440A1 JP 2014050350 W JP2014050350 W JP 2014050350W WO 2014112440 A1 WO2014112440 A1 WO 2014112440A1
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- friction
- friction material
- material composition
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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.
- the binder is 12 to 24% by volume
- the fiber is 2 to 10% by volume
- the 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.
- Patent Document 1 satisfies the above-mentioned regulations in that it does not contain a copper component, the friction coefficient stability at high speed and high load, fading resistance, and wear resistance are satisfied. It cannot be said that the required performance is sufficiently secured.
- the present invention relates to a friction material obtained by molding a friction material composition of a NAO material not containing a copper component, which is used for a disc brake pad.
- the friction coefficient stability at high speed and high load, fade resistance, wear resistance An object of the present invention is to provide a friction material that can ensure the required performance.
- a friction material formed of 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.
- 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 4.0 to 8 binders based on the total amount of the friction material composition. 1.0 wt%, 1.0 to 4.0 wt% of organic fiber with respect to the total amount of the friction material composition, and 0.5 to 4. wt. Of metal sulfide lubricant as the lubricant with respect to the total amount of the friction material composition.
- carbonaceous lubricant is 2.0 to 7.0 wt% with respect to the total amount of the friction material composition
- titanate is 15.0 to 27.0 wt% with respect to the total amount of the friction material composition
- an inorganic friction modifier an inorganic friction modifier with a Mohs hardness of 4.5 or more is 23.0-38.0% by weight based on the total amount of the friction material composition, and an inorganic friction modifier with a Mohs hardness of less than 4.5 is rubbed.
- Friction material characterized by
- the friction material according to (1) characterized in that 7.0 wt% and alumina particles are 0.5 to 3.0 wt% with respect to the total amount of the friction material composition.
- Mica contained in an inorganic friction modifier having a Mohs hardness of less than 4.5 is 2.5 to 7.0% by weight based on the total amount of the friction material composition (1) or (2 ) Friction material.
- a friction material obtained by molding a friction material composition of a NAO material not containing a copper component used for a disc brake pad the friction coefficient stability at high speed and high load, fade resistance, A friction material capable of ensuring the required performance of wear resistance can be provided.
- the binder in a friction material obtained by molding a friction material composition containing no copper component, which is used for a disc brake pad, the binder is 4.0 to 8.0% by weight based on the total amount of the friction material composition, 1.0 to 4.0% by weight of organic fiber with respect to the total amount of the friction material composition, 0.5 to 4.0% by weight of metal sulfide type lubricant as the lubricant with respect to the total amount of the friction material composition, carbon As the inorganic friction modifier, the quality lubricant is 2.0 to 7.0% by weight with respect to the total amount of the friction material composition, and the titanate is 15.0 to 27.0% by weight with respect to the total amount of the friction material composition.
- Binder organic fiber, metal sulfide lubricant, carbonaceous lubricant, titanate, inorganic friction modifier with Mohs hardness of 4.5 or more, inorganic friction modifier with Mohs hardness of less than 4.5, organic
- the friction modifier and pH adjuster are in the above ranges, and by using a friction material composition that does not contain a simple metal other than copper and an alloy other than a copper alloy, it does not contain a copper component that is used in a disc brake pad.
- the friction material obtained by molding the NAO material friction material composition it is possible to provide a friction material capable of ensuring the required performance of stability of the friction coefficient, fade resistance, and wear resistance at high speed and high load.
- 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., and as carbonaceous lubricant, it is usually used for friction materials such as graphite, petroleum coke, pulverized powder of oxidized polyacrylonitrile fiber, etc. These can be used alone or in combination of two or more.
- the titanate preferably has a plate 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.
- An acid salt is mentioned, These can be used individually by 1 type or in combination of 2 or more types.
- Particulate inorganic such as iron trioxide, zeolite, calcium silicate hydrate, glass beads, magnesium oxide, zirconium oxide, zirconium silicate, alumina, silicon carbide, etc.
- Examples include friction modifiers, wollastonite, sepiolite, basalt fibers, glass fibers, biosoluble artificial mineral fibers, and fibrous inorganic friction modifiers such as rock wool. These are used alone or in combination of two or more. Can be used.
- inorganic friction modifiers having a Mohs hardness of less than 4.5 include inorganic friction modifiers commonly used in friction materials such as mica, vermiculite, talc, dolomite, kaolin, and calcium fluoride. Or two or more types can be used in combination.
- the inorganic friction modifier having a Mohs hardness of 4.5 or more at least one fibrous inorganic friction modifier selected from biologically soluble artificial mineral fibers and wollastonite is added to the total amount of the friction material composition. 5 to 8.0% by weight, zirconium oxide particles 20.0 to 27.0% by weight based on the total amount of the friction material composition, and zirconium silicate particles 0.2 to 7.0 based on the total amount of the friction material composition Addition of 0.5% to 3.0% by weight of alumina particles with respect to the total amount of the friction material composition is preferable because the stability of the friction coefficient at high speed and high load and the fade resistance are further improved. .
- mica is added at 2.5 to 7.0% by weight based on the total amount of the friction material composition. It is preferable because stability and fade resistance are further improved.
- Organic friction modifiers are usually used for friction materials such as cashew dust, crushed powder of 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 simple metal other than copper and an alloy other than a copper alloy. Since it does not contain a single metal or alloy having a large specific gravity, the raw material is not segregated during the 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 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 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.
Abstract
The present invention addresses the problem of providing a friction material capable of ensuring required performance at high speed and under high load, in relation to stability of the friction coefficient, feed resistance, and wear resistance, said friction material being a molded friction material composition of a NAO material not containing a copper component. The problem is solved by using a friction material composition that does not contain metal units other than copper or alloys other than copper alloys, and does contain: 4.0-8.0 wt% of a bonding material; 1.0-4.0 wt% of an organic fiber; 0.5-4.0 wt% of a metal sulfide lubricant as a lubricant; 2.0-7.0 wt% of a carbonaceous lubricant; 15.0-27.0 wt% of titanate; 23.0-38.0 wt% of an inorganic friction adjustment material having a hardness, as an inorganic friction adjustment material, of at least 4.5 on the Mohs scale of hardness; 2.0-10.0 wt% of an inorganic friction adjustment material having a hardness of less than 4.5 on the Mohs scale of hardness; 3.0-7.0 wt% of an organic friction adjustment material; and 2.0-3.0 wt% of a pH adjustment material.
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 backdrop, California in the United States has banned the sale of friction materials using friction materials containing 5.0% by weight or more of copper components and assembly into new cars since 2021. There is a bill that prohibits the sale of friction members that use friction materials containing more than 0.5% by weight of components and their 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.
特許文献１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種又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 1, the binder is 12 to 24% by volume, the fiber is 2 to 10% by volume, the 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１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、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 1 satisfies the above-mentioned regulations in that it does not contain a copper component, the friction coefficient stability at high speed and high load, fading resistance, and wear resistance are satisfied. It cannot be said that the required performance is sufficiently secured.
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、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 relates to a friction material obtained by molding a friction material composition of a NAO material not containing a copper component, which is used for a disc brake pad. The friction coefficient stability at high speed and high load, fade resistance, wear resistance An object of the present invention is to provide a friction material that can ensure the required performance.
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と炭素質系潤滑材、チタン酸塩、無機摩擦調整材としてモース硬度が４．５以上の無機摩擦調整材とモース硬度が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、銅以外の金属単体及び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 of 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 lubricants and carbonaceous lubricants, titanates, inorganic friction modifiers with an Mohs hardness of 4.5 or higher, inorganic friction modifiers with a Mohs hardness of less than 4.5, organic friction modifiers It was discovered that the above problems can be solved by using a friction material composition containing a specific amount of a material and a pH adjusting material and containing no metal other than copper and an alloy other than a copper alloy, thereby completing 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４．０～８．０重量％、有機繊維を摩擦材組成物全量に対して１．０～４．０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０．５～４．０重量％、炭素質系潤滑材を摩擦材組成物全量に対して２．０～７．０重量％、チタン酸塩を摩擦材組成物全量に対して１５．０～２７．０重量％、無機摩擦調整材としてモース硬度が４．５以上の無機摩擦調整材を摩擦材組成物全量に対して２３．０～３８．０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２．０～１０．０重量％、有機摩擦調整材を摩擦材組成物全量に対して３．０～７．０重量％、ｐＨ調整材を摩擦材組成物全量に対して２．０～３．０重量％を含有し、銅以外の金属単体及び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 4.0 to 8 binders based on the total amount of the friction material composition. 1.0 wt%, 1.0 to 4.0 wt% of organic fiber with respect to the total amount of the friction material composition, and 0.5 to 4. wt. Of metal sulfide lubricant as the lubricant with respect to the total amount of the friction material composition. 0 wt%, carbonaceous lubricant is 2.0 to 7.0 wt% with respect to the total amount of the friction material composition, titanate is 15.0 to 27.0 wt% with respect to the total amount of the friction material composition, As an inorganic friction modifier, an inorganic friction modifier with a Mohs hardness of 4.5 or more is 23.0-38.0% by weight based on the total amount of the friction material composition, and an inorganic friction modifier with a Mohs hardness of less than 4.5 is rubbed. 2.0 to 10.0% by weight based on the total amount of the material composition, and organic friction modifier based on the total amount of the friction material composition 3.0 to 7.0% by weight, pH adjusting material is contained in an amount of 2.0 to 3.0% by weight with respect to the total amount of the friction material composition, and does not contain simple metals other than copper and alloys other than copper alloys. Friction material characterized by
（２）モース硬度が４．５以上の無機摩擦調整材に含まれる、生体溶解性人造鉱物繊維、ウォラストナイトから選ばれる少なくとも１種の繊維状無機摩擦調整材を摩擦材組成物全量に対して０．５～８．０重量％、酸化ジルコニウム粒子を摩擦材組成物全量に対して２０．０～２７．０重量％、ケイ酸ジルコニウム粒子を摩擦材組成物全量に対して０．２～７．０重量％、アルミナ粒子を摩擦材組成物全量に対して０．５～３．０重量％とすることを特徴とする（１）の摩擦材。
(2) At least one fibrous inorganic friction modifier selected from biosoluble artificial mineral fibers and wollastonite contained in an inorganic friction modifier with a Mohs hardness of 4.5 or more with respect to the total amount of the friction material composition 0.5 to 8.0% by weight, zirconium oxide particles with respect to the total amount of the friction material composition 20.0 to 27.0% by weight, zirconium silicate particles with respect to the total amount of the friction material composition 0.2 to The friction material according to (1), characterized in that 7.0 wt% and alumina particles are 0.5 to 3.0 wt% with respect to the total amount of the friction material composition.
（３）モース硬度が４．５未満の無機摩擦調整材に含まれるマイカを摩擦材組成物全量に対して２．５～７．０重量％とすることを特徴とする（１）又は（２）の摩擦材。
(3) Mica contained in an inorganic friction modifier having a Mohs hardness of less than 4.5 is 2.5 to 7.0% by weight based on the total amount of the friction material composition (1) or (2 ) 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、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。
According to the present invention, in a friction material obtained by molding a friction material composition of a NAO material not containing a copper component used for a disc brake pad, the friction coefficient stability at high speed and high load, fade resistance, A friction material capable of ensuring the required performance of wear resistance can be provided.
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４．０～８．０重量％、有機繊維を摩擦材組成物全量に対して１．０～４．０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０．５～４．０重量％、炭素質系潤滑材を摩擦材組成物全量に対して２．０～７．０重量％、チタン酸塩を摩擦材組成物全量に対して１５．０～２７．０重量％、無機摩擦調整材としてモース硬度が４．５以上の無機摩擦調整材を摩擦材組成物全量に対して２３．０～３８．０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２．０～１０．０重量％、有機摩擦調整材を摩擦材組成物全量に対して３．０～７．０重量％、ｐＨ調整材を摩擦材組成物全量に対して２．０～３．０重量％を含有し、銅以外の金属単体及び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 a friction material obtained by molding a friction material composition containing no copper component, which is used for a disc brake pad, the binder is 4.0 to 8.0% by weight based on the total amount of the friction material composition, 1.0 to 4.0% by weight of organic fiber with respect to the total amount of the friction material composition, 0.5 to 4.0% by weight of metal sulfide type lubricant as the lubricant with respect to the total amount of the friction material composition, carbon As the inorganic friction modifier, the quality lubricant is 2.0 to 7.0% by weight with respect to the total amount of the friction material composition, and the titanate is 15.0 to 27.0% by weight with respect to the total amount of the friction material composition. 23.0 to 38.0% by weight of an inorganic friction modifier with a Mohs hardness of 4.5 or more based on the total amount of the friction material composition, and an inorganic friction modifier with a Mohs hardness of less than 4.5 as the total amount of the friction material composition 2.0 to 10.0% by weight with respect to the total amount of the friction material composition. -7.0 wt%, friction material composition containing 2.0 to 3.0 wt% of pH adjusting material with respect to the total amount of the friction material composition, and containing no metal other than copper and alloy other than 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、モース硬度が４．５以上の無機摩擦調整材、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、銅以外の金属単体及び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、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, inorganic friction modifier with Mohs hardness of 4.5 or more, inorganic friction modifier with Mohs hardness of less than 4.5, organic The friction modifier and pH adjuster are in the above ranges, and by using a friction material composition that does not contain a simple metal other than copper and an alloy other than a copper alloy, it does not contain a copper component that is used in a disc brake pad. In the friction material obtained by molding the NAO material friction material composition, it is possible to provide a friction material capable of ensuring the required performance of stability of the friction coefficient, fade resistance, and wear resistance at high speed and high load.
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、炭素質系潤滑材として、グラファイト、石油コークス、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 metal sulfide lubricant, molybdenum disulfide, zinc sulfide, tin sulfide, composite metal sulfide, etc., and as carbonaceous lubricant, it is usually used for friction materials such as graphite, petroleum coke, pulverized powder of oxidized polyacrylonitrile fiber, etc. These can be used alone or in combination of two or more.
チタン酸塩として、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 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. An acid salt 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以上の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、アルミナ、炭化ケイ素等の粒子状無機摩擦調整材、ウォラストナイト、セピオライト、バサルト繊維、ガラス繊維、生体溶解性人造鉱物繊維、ロックウール等の繊維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。
Particulate inorganic such as iron trioxide, zeolite, calcium silicate hydrate, glass beads, magnesium oxide, zirconium oxide, zirconium silicate, alumina, silicon carbide, etc. Examples include friction modifiers, wollastonite, sepiolite, basalt fibers, glass fibers, biosoluble artificial mineral fibers, and fibrous inorganic friction modifiers such as rock wool. These are used alone or in combination of two or more. Can be used.
モース硬度が４．５未満の無機摩擦調整材として、マイカ、バーミキュライト、タルク、ドロマイト、カオリン、フッ化カルシウム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, vermiculite, talc, dolomite, kaolin, and calcium fluoride. Or two or more types can be used in combination.
特に、モース硬度が４．５以上の無機摩擦調整材として、生体溶解性人造鉱物繊維、ウォラストナイトから選ばれる少なくとも１種の繊維状無機摩擦調整材を摩擦材組成物全量に対して０．５～８．０重量％、酸化ジルコニウム粒子を摩擦材組成物全量に対して２０．０～２７．０重量％、ケイ酸ジルコニウム粒子を摩擦材組成物全量に対して０．２～７．０重量％、アルミナ粒子を摩擦材組成物全量に対して０．５～３．０重量％を添加することにより高速・高負荷時での摩擦係数の安定性、耐フェード性がより向上するので好ましい。
In particular, as the inorganic friction modifier having a Mohs hardness of 4.5 or more, at least one fibrous inorganic friction modifier selected from biologically soluble artificial mineral fibers and wollastonite is added to the total amount of the friction material composition. 5 to 8.0% by weight, zirconium oxide particles 20.0 to 27.0% by weight based on the total amount of the friction material composition, and zirconium silicate particles 0.2 to 7.0 based on the total amount of the friction material composition Addition of 0.5% to 3.0% by weight of alumina particles with respect to the total amount of the friction material composition is preferable because the stability of the friction coefficient at high speed and high load and the fade resistance are further improved. .
また、モース硬度が４．５未満の無機摩擦調整材として、マイカを摩擦材組成物全量に対して２．５～７．０重量％添加することにより、高速・高負荷時での摩擦係数の安定性、耐フェード性がより向上するので好ましい。
In addition, as an inorganic friction modifier with a Mohs hardness of less than 4.5, mica is added at 2.5 to 7.0% by weight based on the total amount of the friction material composition. It is preferable because stability and fade resistance are further improved.
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又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, crushed powder of 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、銅以外の金属単体及び銅合金以外の合金を含有しないことを特徴とする。比重の大きな金属単体及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 simple metal other than copper and an alloy other than a copper alloy. Since it does not contain a single metal or alloy having a large specific gravity, the raw material is not segregated during the 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、摩擦材原料混合物又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, before the heat and pressure molding step, 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 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、摩擦係数の安定性、耐フェード性、耐摩耗性を評価した。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 stability of friction coefficient, fade resistance, and wear resistance. 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、摩擦係数の安定性、耐フェード性、耐摩耗性を評価した。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 stability of friction coefficient, fade resistance, and wear resistance. 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、高速・高負荷時での摩擦係数の安定性、耐フェード性、耐摩耗性の要求性能を確保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, in a friction material obtained by molding a friction material composition of a NAO material not containing a copper component used for a disc brake pad, the friction coefficient stability at high speed and high load, fade resistance, A friction material capable of ensuring the required performance of wear resistance can be obtained, and has extremely high practical value.
According to the present invention, in a friction material obtained by molding a friction material composition of a NAO material not containing a copper component used for a disc brake pad, the friction coefficient stability at high speed and high load, fade resistance, A friction material capable of ensuring the required performance of wear resistance can be obtained, and has extremely high practical value.
Claims (3)
- 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４．０～８．０重量％、
有機繊維を摩擦材組成物全量に対して１．０～４．０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０．５～４．０重量％、
炭素質系潤滑材を摩擦材組成物全量に対して２．０～７．０重量％、
チタン酸塩を摩擦材組成物全量に対して１５．０～２７．０重量％、
無機摩擦調整材として
モース硬度が４．５以上の無機摩擦調整材を摩擦材組成物全量に対して２３．０～３８．０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２．０～１０．０重量％、
有機摩擦調整材を摩擦材組成物全量に対して３．０～７．０重量％、
ｐＨ調整材を摩擦材組成物全量に対して２．０～３．０重量％を含有し、
銅以外の金属単体及び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
4.0 to 8.0% by weight of the binder with respect to the total amount of the friction material composition,
1.0 to 4.0% by weight of organic fiber with respect to the total amount of the friction material composition,
As a lubricant, a metal sulfide-based lubricant is 0.5 to 4.0% by weight with respect to the total amount of the friction material composition,
The carbonaceous lubricant is 2.0 to 7.0% by weight with respect to the total amount of the friction material composition,
15.0 to 27.0% by weight of titanate with respect to the total amount of the friction material composition,
As an inorganic friction modifier, an inorganic friction modifier with a Mohs hardness of 4.5 or more is 23.0-38.0% by weight 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 10.0% by weight based on the total amount of the friction material composition;
The organic friction modifier is 3.0 to 7.0% by weight based on the total amount of the friction material composition,
The pH adjusting material contains 2.0 to 3.0% by weight with respect to the total amount of the friction material composition,
A friction material characterized by not containing a simple metal other than copper and an alloy other than a copper alloy. - モース硬度が４．５以上の無機摩擦調整材に含まれる、
生体溶解性人造鉱物繊維、ウォラストナイトから選ばれる少なくとも１種の繊維状無機摩擦調整材を摩擦材組成物全量に対して０．５～８．０重量％、
酸化ジルコニウム粒子を摩擦材組成物全量に対して２０．０～２７．０重量％、
ケイ酸ジルコニウム粒子を摩擦材組成物全量に対して０．２～７．０重量％、
アルミナ粒子を摩擦材組成物全量に対して０．５～３．０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 inorganic friction modifiers with Mohs hardness of 4.5 or more,
0.5 to 8.0 wt% of at least one fibrous inorganic friction modifier selected from biosoluble artificial mineral fibers and wollastonite based on the total amount of the friction material composition,
20.0 to 27.0% by weight of zirconium oxide particles with respect to the total amount of the friction material composition,
0.2 to 7.0% by weight of zirconium silicate particles based on the total amount of the friction material composition,
0.5 to 3.0% by weight of alumina particles based on the total amount of the friction material composition
The friction material according to claim 1, wherein: - モース硬度が４．５未満の無機摩擦調整材に含まれるマイカを摩擦材組成物全量に対して２．５～７．０重量％とすることを特徴とする請求項１又は２に記載の摩擦材。
3. The friction according to claim 1, wherein mica contained in the inorganic friction modifier having a Mohs hardness of less than 4.5 is 2.5 to 7.0% by weight based on the total amount of the friction material composition. Wood.
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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 |
| WO2017090633A1 (en) * | 2015-11-27 | 2017-06-01 | 曙ブレーキ工業株式会社 | Friction material |
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| JP6753579B2 (en) * | 2014-10-14 | 2020-09-09 | 日本ブレーキ工業株式会社 | Friction material composition, friction material and friction member |
| JP6301997B2 (en) * | 2016-04-19 | 2018-03-28 | 日清紡ブレーキ株式会社 | Friction material |
| JP2019151854A (en) * | 2019-05-17 | 2019-09-12 | 日本ブレーキ工業株式会社 | Friction material composition, friction material, and friction member |
| KR102512421B1 (en) * | 2021-07-22 | 2023-03-22 | 주식회사 제이비앤아이 | Friction Material for Drum Brake Lining |
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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 |
| JP2016035005A (en) * | 2014-08-01 | 2016-03-17 | 日清紡ブレーキ株式会社 | Friction material |
| WO2017090633A1 (en) * | 2015-11-27 | 2017-06-01 | 曙ブレーキ工業株式会社 | Friction material |
| JP2017095646A (en) * | 2015-11-27 | 2017-06-01 | 曙ブレーキ工業株式会社 | Friction material |
| CN108291133A (en) * | 2015-11-27 | 2018-07-17 | 曙制动器工业株式会社 | Friction material |
| US10584757B2 (en) | 2015-11-27 | 2020-03-10 | Akebono Brake Industry Co., Ltd. | Friction material |
| CN108291133B (en) * | 2015-11-27 | 2021-10-26 | 曙制动器工业株式会社 | Friction material |
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