WO2017014173A1 - Friction material - Google Patents
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- WO2017014173A1 WO2017014173A1 PCT/JP2016/070953 JP2016070953W WO2017014173A1 WO 2017014173 A1 WO2017014173 A1 WO 2017014173A1 JP 2016070953 W JP2016070953 W JP 2016070953W WO 2017014173 A1 WO2017014173 A1 WO 2017014173A1
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- friction material
- friction
- material composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
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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—Composition of linings ; Methods of manufacturing
Definitions
- the present invention relates to a friction material obtained by molding a friction material composition of NAO (Non-Asbestos-Organic) material used for a disc brake pad.
- NAO Non-Asbestos-Organic
- a disc brake is used as a braking device for a passenger car, and a disc brake pad in which a friction material is attached to a metal base member is used as the friction member.
- Friction materials used for disc brake pads are mainly classified into the following three types.
- the rust fixation is a phenomenon in which the disc rotor and the friction material are fixed by rust after the automobile is left for a long time in a parking brake state.
- a technique of adding a pH adjusting material such as an alkali metal salt or an alkaline earth metal salt to the friction material is known.
- Patent Literature 2 as a material effective in rust prevention of iron in a brake friction material made of a fiber base material, a friction adjusting material, and a binding material, an alkali metal alkaline earth metal hydroxide (calcium hydroxide or the like) is disclosed. ) And alkali metal alkaline earth metal carbonates (sodium carbonate, etc.).
- Patent Document 3 describes a friction material obtained by heat-pressing a friction material composition containing 0.2 to 5% by weight of an alkali metal salt (sodium carbonate, potassium carbonate) in the entire composition. ing. According to the friction material of patent document 2 and patent document 3, it is supposed that the pH of the contact surface of a friction material and a disk rotor can be maintained alkaline, and the rusting of a disk rotor can be suppressed.
- an alkali metal salt sodium carbonate, potassium carbonate
- Patent Document 4 discloses a non-asbestos disc brake pad for automobiles including a fiber base material, a binder, and a friction modifier.
- the binder includes at least a silicone-modified resin, and the friction modifier has an average particle size of 0.
- a non-asbestos disc brake pad for automobiles is described which contains an organic filler containing abrasives having a Mohs hardness of 7 to 5 ⁇ m and an average particle size of 250 ⁇ m or less.
- the present invention is a friction material obtained by molding a NAO material friction material composition used for a disc brake of an automobile or the like. Even when a vehicle in a parking brake state is left for a long time under high humidity, the effect of suppressing rusting is achieved. The friction material which can prevent rust fixation without decreasing is provided.
- the present inventors are adding a water-repellent raw material to the friction material composition in order to eliminate moisture that usually causes direct rusting.
- friction materials containing metal salts and alkaline earth metal salts conversely, by giving the friction materials themselves appropriate water absorption, rusting occurs even when a parking brake vehicle is left under high humidity for a long period of time. It has been found that the effect of suppressing the rust is not lowered and rust fixation can be prevented.
- the present invention has been completed on the knowledge that the effect is further improved by adding a specific metal sulfide as a lubricant, a specific porous particle as a friction modifier, and a specific titanate.
- the present invention is a friction material obtained by molding a friction material composition of NAO material used for a disc brake pad of an automobile or the like, and is based on the following technique.
- the friction material composition is a pH adjustment material.
- As an alkali metal salt and / or alkaline earth metal salt 2 to 6% by weight based on the total amount of the friction material composition, and fibrillated organic fiber as a fiber base material based on 1 to 7% by weight based on the total amount of the friction material composition
- a friction material having a water-repellent component content of 0 to 0.5% by weight based on the total amount of the friction material composition is a pH adjustment material.
- pH adjusting material comprises one or a combination of two or more selected from sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, and calcium hydroxide.
- fibrillated organic fiber comprises one or a combination of two or more selected from aramid fiber, cellulose fiber, and acrylic fiber.
- rusting occurs even when an automobile in a parking brake state is left for a long time under high humidity. It is possible to provide a friction material capable of preventing rust fixation without reducing the suppression effect.
- the present invention relates to a friction material formed by molding a friction material composition of NAO material including a binder, a fiber base material, a friction adjustment material, a lubricant, a pH adjustment material, and a filler. And / or 2 to 6% by weight of alkaline earth metal salt based on the total amount of the friction material composition, and 1 to 7% by weight of organic fiber fibrillated as the fiber base material based on the total amount of the friction material composition, and A friction material composition having a water repellent component content of 0 to 0.5% by weight based on the total amount of the friction material composition is used.
- the fibrillated organic fiber having water absorption as a fiber base material is contained with respect to the total amount of the friction material composition, and the content of the water-repellent component that inhibits water absorption is frictionally reduced.
- an appropriate water absorption is imparted to the friction material itself.
- alkali metal salts such as sodium carbonate, potassium carbonate, sodium hydrogen carbonate and potassium hydrogen carbonate
- alkaline earth metal salts such as calcium hydroxide.
- the fibrillated organic fiber one or a combination of two or more selected from aramid fiber, cellulose fiber, and acrylic fiber can be used.
- the content of the alkali metal salt or alkaline earth metal salt as the pH adjusting material is less than 2% by weight based on the total amount of the friction material composition, a sufficient rust prevention effect cannot be obtained, and the content exceeds 6% by weight. In the heat and pressure molding process of the friction material, it becomes a factor that hinders the curing reaction of the phenol resin that is the binder, resulting in a problem that the wear resistance of the friction material is reduced.
- the content of the fibrillated organic fiber is less than 1% by weight based on the total amount of the friction material composition, the friction material itself cannot be provided with appropriate water absorption, and thus the durability of the rust prevention effect is exhibited.
- it exceeds 7% by weight fiber balls are generated in the mixing step, and there is a problem that poor mixing tends to occur.
- 0.5 to 6% by weight of zinc sulfide is contained as a lubricant with respect to the total amount of the friction material composition.
- Zinc sulfide has the effect of imparting lubricity to the friction material and improving wear resistance, and has the property of being decomposed by frictional heat between the friction material and the disk rotor during braking to generate metallic zinc.
- Zeolite, activated carbon, activated alumina, etc. can be used as the porous inorganic particles.
- activated carbon it is preferable to use activated carbon alone, and it is particularly preferable to use hydrophilic activated carbon that has been subjected to acid treatment with an acid such as hydrochloric acid or sulfuric acid to make the surface hydrophilic.
- magnesium potassium titanate is contained as an inorganic friction modifier.
- Magnesium potassium titanate has a higher alkali elution rate than 6-potassium titanate, 8-potassium titanate, and lithium-potassium titanate, so that the pH of the contact surface between the friction material and the disk rotor can be kept alkaline, and rusting occurs. Can be further improved.
- the friction material of the present invention includes the above-mentioned pH adjusting material, fibrillated organic fiber, zinc sulfide, porous inorganic particles having sulfate ion adsorbing ability, as well as a binding material and a fiber base material that are normally used for friction materials. And a friction material composition including a friction modifier, a lubricant, and a filler.
- binders straight phenol resin, phenol resin modified with cashew oil, various elastomers such as acrylic rubber and silicone rubber, aralkyl modified phenol obtained by reacting phenols, aralkyl ethers and aldehydes
- binders are usually used for friction materials such as thermosetting resins in which various elastomers and fluoropolymers are dispersed in resins and phenol resins. These may be used alone or in combination of two or more. it can.
- the content of the binder is preferably 9 to 15% by weight, more preferably 8 to 12% by weight, based on the total amount of the friction material composition in order to ensure sufficient mechanical strength and wear resistance. preferable.
- the fiber base material examples include non-ferrous metal fibers such as copper fibers, bronze fibers, brass fibers, aluminum fibers, and aluminum-zinc alloy fibers in addition to the above-described fibrillated organic fibers. It can be used alone or in combination of two or more.
- the content of the fiber base material is preferably 5 to 20% by weight, more preferably 7 to 15% by weight, based on the total amount of the friction material composition together with the fibrillated organic fiber.
- metal sulfide-based lubricants such as molybdenum disulfide, tin sulfide, iron sulfide, composite metal sulfide, artificial graphite, natural graphite, flake graphite, petroleum coke, Lubricants usually used for friction materials such as carbonaceous lubricants such as elastic graphitized carbon and oxidized polyacrylonitrile fiber pulverized powder, etc. are mentioned, and these should be used alone or in combination of two or more. Can do.
- the content of the lubricant is preferably 3 to 8% by weight, more preferably 4 to 6% by weight based on the total amount of the friction material composition together with the zinc sulfide.
- the inorganic friction modifier examples include various metals such as zirconium oxide, zirconium silicate, magnesium oxide, ⁇ -alumina, talc, mica, vermiculite, copper and brass in addition to the porous inorganic particles and magnesium potassium titanate. Particles, plate-like titanates other than magnesium potassium titanate, particulate inorganic friction modifiers such as irregularly shaped titanates having a plurality of convex portions, wollastonite, sepiolite, basalt fiber, glass fiber, Examples thereof include fibrous inorganic friction modifiers such as biosoluble ceramic fibers and rock wool, and these can be used alone or in combination of two or more.
- the content of the inorganic friction modifier is preferably 40 to 50% by weight, more preferably 43 to 47% by weight, based on the total amount of the friction material composition together with the porous inorganic particles.
- Organic friction modifiers are usually used for crushed powder of cashew dust, tire tread rubber, vulcanized rubber powder such as nitrile rubber, acrylic rubber, butyl rubber, silicone rubber, or unvulcanized rubber powder. These organic friction modifiers can be used, and these can be used alone or in combination of two or more.
- the content of the organic friction modifier is preferably 3 to 8% by weight, more preferably 4 to 7% by weight, based on the total amount of the friction material composition.
- a filler such as barium sulfate is used.
- those having water repellency are silicone rubber-modified phenolic resin, silicone rubber-dispersed phenolic resin, fluoropolymer-dispersed phenolic resin, silicone rubber powder, and various friction modifiers coated with silicone rubber or silicone oil.
- the total water-repellent components of the silicone rubber, silicone oil and fluoropolymer contained in the raw materials are 0 to 0.5% by weight based on the total amount of the friction material composition. Use to be.
- the friction material of the present invention comprises a mixing step in which a predetermined amount of the friction material composition is uniformly mixed using a mixer, and the resulting friction material raw material mixture is separately cleaned and surface-treated separately,
- the applied back plate is overlaid and put into a thermoforming mold, and heated and pressed to form by heating and pressing, the resulting molded product is heated to complete the curing reaction of the binder, spray coating, It is manufactured through a painting process in which paint is applied by electrostatic powder coating, a paint baking process in which paint is baked, and a polishing process in which a friction surface is formed by a rotating grindstone.
- the coating process, the heat treatment process also serving as paint baking, and the polishing process are performed in this order.
- granulation step for granulating the friction material raw material mixture kneading step for kneading the friction material raw material mixture, granulation obtained in the friction material raw material mixture or granulation step
- the preform and the kneaded product obtained in the kneading process are put into a preforming mold, and a preforming process for molding the preform is performed, and the scorch process is performed after the heat and pressure molding process.
- Friction material compositions having the compositions shown in Tables 1 to 3 were mixed for 5 minutes with a Redige mixer, and pre-molded by pressurizing at 30 MPa in a molding die for 10 seconds. This preform is placed on a steel back plate that has been washed, surface-treated, and coated with an adhesive, and molded in a thermoforming mold at a molding temperature of 150 ° C. and a molding pressure of 40 MPa for 10 minutes, and then 200 Heat treatment (post-curing) was carried out at 5 ° C. for 5 hours, and polishing was performed to form a friction surface, thereby producing disc brake pads for passenger cars (Examples 1 to 26, Comparative Examples 1 to 5).
- ⁇ Abrasion resistance> In accordance with JASO C427 "Automobile-brake lining and disc brake pad-dynamometer wear test method", braking initial speed 50km / h, braking deceleration 0.3G, braking frequency as appropriate, brake temperature before braking 200 ° C, The amount of wear (mm) of the friction material was measured, converted into the amount of wear per 1000 times of braking, and then evaluated according to the following criteria. : Less than 0.15 ⁇ : 0.15 or more and less than 0.20 ⁇ : 0.20 or more and less than 0.50 ⁇ : 0.50 or more-: Not evaluated due to poor mixing
- a vehicle in a parking brake state can be used under high humidity while satisfying the regulations regarding the content of copper components. Even when left for a long period of time, the effect of suppressing rusting does not decrease, and a friction material capable of preventing rust fixation can be provided, which has extremely high practical value.
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Abstract
Description
本発明は、ディスクブレーキパッドに使用される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 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金属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 attached to a metal base member is used as the friction member.
ディスクブレーキパッドに使用される摩擦材は、主に次の３種に分類されている。
＜セミメタリック摩擦材＞
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て３０重量％以上６０重量％未満含有する摩擦材。
＜ロースチール摩擦材＞
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て３０重量％未満含有する摩擦材。
＜ＮＡＯ（Non-Asbestos-Organic）材＞
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摩擦材。
Friction materials used for disc brake pads are mainly classified into the following three types.
<Semi-metallic friction material>
A friction material containing steel fiber as a fiber base material in an amount of 30% by weight to less than 60% by weight based on the total amount of the friction material composition.
<Low steel friction material>
A friction material containing steel fibers as a part of a fiber base material and containing less than 30% by weight of steel fibers with respect to the total amount of the friction material composition.
<NAO (Non-Asbestos-Organic)>
Friction material that does not contain steel fibers such as steel fibers and stainless fibers as the fiber base material.
近年においてはブレーキの静寂性が求められており、ブレーキノイズの発生が少ないＮＡＯ材の摩擦材を使用した摩擦部材が広く使用されるようになってきている。 In recent years, quietness of brakes has been demanded, and friction members using NAO friction materials that generate less brake noise have been widely used.
ＮＡＯ材の摩擦材を、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に使用すると錆固着が発生しやすくなるという問題がある。 When the friction material of NAO material is used for a disk brake of a type in which an electric parking function is added to a fluid service brake device as in Patent Document 1, rust sticking is likely to occur.
錆固着とは、自動車がパーキングブレーキ状態で長期間放置された後に、ディスクロータと摩擦材が錆によって固着する現象である。
錆固着の原因となる発錆を抑制するため、摩擦材にはアルカリ金属塩やアルカリ土類金属塩等のｐＨ調整材を添加する技術が知られている。
The rust fixation is a phenomenon in which the disc rotor and the friction material are fixed by rust after the automobile is left for a long time in a parking brake state.
In order to suppress rusting that causes rust fixation, a technique of adding a pH adjusting material such as an alkali metal salt or an alkaline earth metal salt to the friction material is known.
特許文献２には、繊維基材、摩擦調整材及び結合材よりなるブレーキ用摩擦材において、鉄の防錆に効果がある材料として、アルカリ金属アルカリ土類金属の水酸化物（水酸化カルシウム等）やアルカリ金属アルカリ土類金属の炭酸塩（炭酸ナトリウム等）を有してなることを特徴とするブレーキ用摩擦材が記載されている。 In Patent Literature 2, as a material effective in rust prevention of iron in a brake friction material made of a fiber base material, a friction adjusting material, and a binding material, an alkali metal alkaline earth metal hydroxide (calcium hydroxide or the like) is disclosed. ) And alkali metal alkaline earth metal carbonates (sodium carbonate, etc.).
特許文献３には、全組成物中にアルカリ金属塩（炭酸ナトリウム、炭酸カリウム）を０．２～５重量％含有してなる摩擦材組成物を加熱加圧成形してなる摩擦材が記載されている。
特許文献２や特許文献３の摩擦材によれば、摩擦材とディスクロータの接触面のｐＨをアルカリ性に保つことができ、ディスクロータの発錆を抑制することができるとされている。
Patent Document 3 describes a friction material obtained by heat-pressing a friction material composition containing 0.2 to 5% by weight of an alkali metal salt (sodium carbonate, potassium carbonate) in the entire composition. ing.
According to the friction material of patent document 2 and patent document 3, it is supposed that the pH of the contact surface of a friction material and a disk rotor can be maintained alkaline, and the rusting of a disk rotor can be suppressed.
また、摩擦材に撥水性を持つ原料を添加することにより、発錆を抑制する方法も検討されている。 Also, a method of suppressing rusting by adding a water repellent raw material to the friction material has been studied.
特許文献４には、繊維基材、結合剤及び摩擦調整剤を含む自動車用非石綿ディスクブレーキパッドにおいて、該結合剤には少なくともシリコーン変性樹脂を含み、摩擦調整剤には平均粒径が０．５～５μｍでモース硬度７以上の研削材と平均粒径が２５０μｍ以下のカシューダストを含む有機充填剤を含有してなる自動車用非石綿ディスクブレーキパッドが記載されている。 Patent Document 4 discloses a non-asbestos disc brake pad for automobiles including a fiber base material, a binder, and a friction modifier. The binder includes at least a silicone-modified resin, and the friction modifier has an average particle size of 0. A non-asbestos disc brake pad for automobiles is described which contains an organic filler containing abrasives having a Mohs hardness of 7 to 5 μm and an average particle size of 250 μm or less.
特許文献４の自動車用非石綿ディスクブレーキパッドによれば、制動による摩擦によりディスクロータの摩擦面に発錆の原因となる水分を寄せ付けない撥水性の被膜を形成することができ、ディスクロータの発錆が抑制されるとされている。 According to the non-asbestos disc brake pad for automobiles of Patent Document 4, a water-repellent film that does not attract moisture that causes rusting on the friction surface of the disc rotor due to friction caused by braking can be formed. It is said that rust is suppressed.
このようなｐＨ調整材と撥水性原料を併用すると、それぞれの作用により、極めて良好なディスクロータの発錆の抑制効果を得ることが理解できる。 It can be understood that when such a pH adjusting material and a water-repellent raw material are used in combination, an extremely good effect of suppressing rusting of the disk rotor can be obtained by each action.
しかし、その効果は摩擦材の使用初期に限定されるものであり、パーキングブレーキ状態の自動車が高湿度下で長期間放置された場合、発錆の抑制効果が著しく低下し、最後には錆固着が発生することが明らかになった。 However, the effect is limited to the initial use of the friction material, and when a car with a parking brake is left for a long time under high humidity, the effect of suppressing rusting is significantly reduced, and finally the rust sticking It became clear that occurred.
本発明は、自動車等のディスクブレーキに使用される、ＮＡＯ材の摩擦材組成物を成型した摩擦材において、パーキングブレーキ状態の自動車が高湿度下で長期間放置された場合でも発錆の抑制効果が低下せず、錆固着を防止することができる摩擦材を提供する。 INDUSTRIAL APPLICABILITY The present invention is a friction material obtained by molding a NAO material friction material composition used for a disc brake of an automobile or the like. Even when a vehicle in a parking brake state is left for a long time under high humidity, the effect of suppressing rusting is achieved. The friction material which can prevent rust fixation without decreasing is provided.
本発明者等は鋭意検討の結果、通常は発錆の直接的な原因となる水分を排除するため、摩擦材組成物に撥水性を持つ原料を添加するところであるが、ｐＨ調整材としてのアルカリ金属塩やアルカリ土類金属塩を含む摩擦材においては、逆に摩擦材自体に適度な吸水性を付与することにより、パーキングブレーキ状態の自動車が高湿度下で長期間放置された場合でも発錆の抑制効果が低下せず、錆固着を防止できることを知見した。 As a result of intensive studies, the present inventors are adding a water-repellent raw material to the friction material composition in order to eliminate moisture that usually causes direct rusting. In friction materials containing metal salts and alkaline earth metal salts, conversely, by giving the friction materials themselves appropriate water absorption, rusting occurs even when a parking brake vehicle is left under high humidity for a long period of time. It has been found that the effect of suppressing the rust is not lowered and rust fixation can be prevented.
さらに、潤滑材として特定の金属硫化物、摩擦調整材として特定の多孔質粒子、特定のチタン酸塩を添加するとその効果がより向上することを知見して本発明を完成させた。 Further, the present invention has been completed on the knowledge that the effect is further improved by adding a specific metal sulfide as a lubricant, a specific porous particle as a friction modifier, and a specific titanate.
本発明は、自動車等のディスクブレーキパッドに使用される、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 used for a disc brake pad of an automobile or the like, and is based on the following technique.
（１）結合材、繊維基材、摩擦調整材、潤滑材、ｐＨ調整材、充填材を含むＮＡＯ材の摩擦材組成物を成型してなる摩擦材において、摩擦材組成物は、ｐＨ調整材としてアルカリ金属塩および／またはアルカリ土類金属塩を摩擦材組成物全量に対し２～６重量％と、繊維基材としてフィブリル化された有機繊維を摩擦材組成物全量に対し１～７重量％を含有し、且つ、撥水性成分の含有量が摩擦材組成物全量に対し０～０．５重量％である摩擦材。 (1) In a friction material formed by molding a friction material composition of NAO material including a binder, a fiber base material, a friction adjustment material, a lubricant, a pH adjustment material, and a filler, the friction material composition is a pH adjustment material. As an alkali metal salt and / or alkaline earth metal salt, 2 to 6% by weight based on the total amount of the friction material composition, and fibrillated organic fiber as a fiber base material based on 1 to 7% by weight based on the total amount of the friction material composition And a friction material having a water-repellent component content of 0 to 0.5% by weight based on the total amount of the friction material composition.
（２）ｐＨ調整材が炭酸ナトリウム、炭酸カリウム、炭酸水素ナトリウム、炭酸水素カリウム、水酸化カルシウムから選ばれる１種または２種以上の組合せからなる（１）の摩擦材。 (2) The friction material according to (1), wherein the pH adjusting material comprises one or a combination of two or more selected from sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, and calcium hydroxide.
（３）フィブリル化された有機繊維がアラミド繊維、セルロース繊維、アクリル繊維から選ばれる１種または２種以上の組合せからなる（１）または（２）の摩擦材。 (3) The friction material according to (1) or (2), wherein the fibrillated organic fiber comprises one or a combination of two or more selected from aramid fiber, cellulose fiber, and acrylic fiber.
（４）摩擦材組成物は潤滑材として硫化亜鉛を摩擦材組成物全量に対し０．５～６重量％含有する（１）ないし（３）の摩擦材。 (4) The friction material according to (1) to (3), wherein the friction material composition contains 0.5 to 6% by weight of zinc sulfide as a lubricant with respect to the total amount of the friction material composition.
（５）摩擦材組成物は摩擦調整材として硫酸イオンの吸着能を有する多孔質無機粒子を０．５～５重量％含有する（４）の摩擦材。 (5) The friction material composition according to (4), wherein the friction material composition contains 0.5 to 5% by weight of porous inorganic particles capable of adsorbing sulfate ions as a friction modifier.
（６）硫酸イオンの吸着能を有する多孔質無機粒子が親水性活性炭である（５）の摩擦材。 (6) The friction material according to (5), wherein the porous inorganic particles capable of adsorbing sulfate ions are hydrophilic activated carbon.
（７）摩擦材組成物は無機摩擦調整材としてチタン酸マグネシウムカリウムを含有する（１）ないし（６）の摩擦材。 (7) The friction material composition according to any one of (1) to (6), wherein the friction material composition contains magnesium potassium titanate as an inorganic friction modifier.
本発明によれば、自動車等のディスクブレーキに使用される、ＮＡＯ材の摩擦材組成物を成型した摩擦材において、パーキングブレーキ状態の自動車が高湿度下で長期間放置された場合でも発錆の抑制効果が低下せず、錆固着を防止することができる摩擦材を提供できる。 According to the present invention, in a friction material obtained by molding a friction material composition of NAO material used for a disc brake of an automobile or the like, rusting occurs even when an automobile in a parking brake state is left for a long time under high humidity. It is possible to provide a friction material capable of preventing rust fixation without reducing the suppression effect.
本発明は、結合材、繊維基材、摩擦調整材、潤滑材、ｐＨ調整材、充填材を含むＮＡＯ材の摩擦材組成物を成型してなる摩擦材において、ｐＨ調整材としてアルカリ金属塩および／またはアルカリ土類金属塩を摩擦材組成物全量に対し２～６重量％と、繊維基材としてフィブリル化された有機繊維を摩擦材組成物全量に対し１～７重量％を含有し、且つ、撥水性成分の含有量が摩擦材組成物全量に対し０～０．５重量％である摩擦材組成物を使用する。 The present invention relates to a friction material formed by molding a friction material composition of NAO material including a binder, a fiber base material, a friction adjustment material, a lubricant, a pH adjustment material, and a filler. And / or 2 to 6% by weight of alkaline earth metal salt based on the total amount of the friction material composition, and 1 to 7% by weight of organic fiber fibrillated as the fiber base material based on the total amount of the friction material composition, and A friction material composition having a water repellent component content of 0 to 0.5% by weight based on the total amount of the friction material composition is used.
上記の構成とすることにより、パーキングブレーキ状態の自動車が高湿度下で長期間放置された場合でも発錆の抑制効果が低下せず、錆固着を防止することができる。 By adopting the above-described configuration, even when a vehicle in a parking brake state is left for a long time under high humidity, the effect of suppressing rusting does not decrease, and rust fixation can be prevented.
ｐＨ調整材としてアルカリ金属塩および／またはアルカリ土類金属塩を摩擦材組成物全量に対し２～６重量％含有させることにより、摩擦材とディスクロータの接触面のｐＨがアルカリ性に保たれ、ディスクロータの発錆が抑制される。 By containing 2 to 6% by weight of an alkali metal salt and / or an alkaline earth metal salt as a pH adjusting material with respect to the total amount of the friction material composition, the pH of the contact surface between the friction material and the disk rotor is kept alkaline, and the disk Rotting of the rotor is suppressed.
パーキングブレーキ状態の自動車が高湿度下で長期間放置されると、摩擦材の表面に存在するｐＨ調整材は空気中の水分により溶出し、徐々に減少してゆく。 When a parking brake vehicle is left under high humidity for a long period of time, the pH adjusting material present on the surface of the friction material is eluted by moisture in the air and gradually decreases.
そこで本発明では、繊維基材として吸水性を持つフィブリル化された有機繊維を摩擦材組成物全量に対し１～７重量％を含有させ、且つ、吸水を阻害する撥水性成分の含有量を摩擦材組成物全量に対し０～０．５重量％に制限することで、摩擦材自体に適度な吸水性を付与する。 Therefore, in the present invention, 1 to 7% by weight of the fibrillated organic fiber having water absorption as a fiber base material is contained with respect to the total amount of the friction material composition, and the content of the water-repellent component that inhibits water absorption is frictionally reduced. By limiting to 0 to 0.5% by weight based on the total amount of the material composition, an appropriate water absorption is imparted to the friction material itself.
このようにすることで、摩擦材の内部に水分が浸入しやすくなり、摩擦材の内部に存在するｐＨ調整材が摩擦材の表面に染み出し、ｐＨ調整材による防錆効果を持続させることが可能となる。 By doing so, moisture easily enters the friction material, the pH adjusting material existing inside the friction material oozes out on the surface of the friction material, and the rust preventive effect by the pH adjusting material can be maintained. It becomes possible.
ｐＨ調整材としては、炭酸ナトリウム、炭酸カリウム、炭酸水素ナトリウム、炭酸水素カリウム等のアルカリ金属塩、水酸化カルシウム等のアルカリ土類金属塩から選ばれる１種または２種以上の組合せを使用することができる。 As the pH adjuster, use one or a combination of two or more selected from alkali metal salts such as sodium carbonate, potassium carbonate, sodium hydrogen carbonate and potassium hydrogen carbonate, and alkaline earth metal salts such as calcium hydroxide. Can do.
フィブリル化された有機繊維としては、アラミド繊維、セルロース繊維、アクリル繊維から選ばれる１種または２種以上の組合せを使用することができる。 As the fibrillated organic fiber, one or a combination of two or more selected from aramid fiber, cellulose fiber, and acrylic fiber can be used.
ｐＨ調整材としてのアルカリ金属塩、アルカリ土類金属塩の含有量が摩擦材組成物全量に対して２重量％未満であると充分な防錆効果を得ることができず、６重量％を超えると摩擦材の加熱加圧成型工程において結合材であるフェノール樹脂の硬化反応を阻害する要因となり、摩擦材の耐摩耗性が低下するという問題が生じる。 If the content of the alkali metal salt or alkaline earth metal salt as the pH adjusting material is less than 2% by weight based on the total amount of the friction material composition, a sufficient rust prevention effect cannot be obtained, and the content exceeds 6% by weight. In the heat and pressure molding process of the friction material, it becomes a factor that hinders the curing reaction of the phenol resin that is the binder, resulting in a problem that the wear resistance of the friction material is reduced.
また、フィブリル化された有機繊維の含有量が摩擦材組成物全量に対して１重量％未満であると摩擦材自体に適度な吸水性を付与することができないため防錆効果の持続性が発現されず、７重量％を超えると混合工程においてファイバーボールが生成され、混合不良が発生しやすくなるという問題が生じる。 In addition, if the content of the fibrillated organic fiber is less than 1% by weight based on the total amount of the friction material composition, the friction material itself cannot be provided with appropriate water absorption, and thus the durability of the rust prevention effect is exhibited. However, if it exceeds 7% by weight, fiber balls are generated in the mixing step, and there is a problem that poor mixing tends to occur.
さらに本発明では潤滑材として硫化亜鉛を摩擦材組成物全量に対し０．５～６重量％含有させる。 Furthermore, in the present invention, 0.5 to 6% by weight of zinc sulfide is contained as a lubricant with respect to the total amount of the friction material composition.
硫化亜鉛は、摩擦材に潤滑性を付与し、耐摩耗性を向上させる効果を有するとともに、制動時の摩擦材とディスクロータとの摩擦熱により分解し、金属亜鉛を生成させる特性を有する。 Zinc sulfide has the effect of imparting lubricity to the friction material and improving wear resistance, and has the property of being decomposed by frictional heat between the friction material and the disk rotor during braking to generate metallic zinc.
ディスクロータの摩擦面に金属亜鉛を含む被膜が形成されると、この金属亜鉛が犠牲陽極となり、ディスクロータの発錆が抑制される。 When a coating containing metallic zinc is formed on the friction surface of the disc rotor, this metallic zinc becomes a sacrificial anode, and rusting of the disc rotor is suppressed.
しかし、この硫化亜鉛は吸水すると徐々に酸化され硫酸亜鉛に変化し、発錆の原因となる硫酸イオンを生成する。 However, when this zinc sulfide absorbs water, it is gradually oxidized to change into zinc sulfate, and sulfate ions that cause rusting are generated.
そこで本発明では硫酸イオンを吸着する多孔質無機粒子を摩擦材組成物全量に対し０．５～５重量％含有させることにより、硫化亜鉛から生成される硫酸イオンによる発錆を抑制する。 Therefore, in the present invention, by containing 0.5 to 5% by weight of porous inorganic particles adsorbing sulfate ions with respect to the total amount of the friction material composition, rusting due to sulfate ions generated from zinc sulfide is suppressed.
多孔質無機粒子としてはゼオライト、活性炭、活性アルミナ等を使用することができる。 Zeolite, activated carbon, activated alumina, etc. can be used as the porous inorganic particles.
活性炭を単独で使用するのが好ましく、塩酸や硫酸等の酸で酸処理を施し表面が親水性となった親水性活性炭を使用するのが特に好ましい。 It is preferable to use activated carbon alone, and it is particularly preferable to use hydrophilic activated carbon that has been subjected to acid treatment with an acid such as hydrochloric acid or sulfuric acid to make the surface hydrophilic.
さらに本発明では無機摩擦調整材としてチタン酸マグネシウムカリウムを含有する。チタン酸マグネシウムカリウムは６チタン酸カリウム、８チタン酸カリウム、チタン酸リチウムカリウムと比較してアルカリ溶出率が大きいため、摩擦材とディスクロータの接触面のｐＨをアルカリ性に保つことができ、発錆の抑制効果をより向上させることができる。 Furthermore, in the present invention, magnesium potassium titanate is contained as an inorganic friction modifier. Magnesium potassium titanate has a higher alkali elution rate than 6-potassium titanate, 8-potassium titanate, and lithium-potassium titanate, so that the pH of the contact surface between the friction material and the disk rotor can be kept alkaline, and rusting occurs. Can be further improved.
本発明の摩擦材は、上記のｐＨ調整材、フィブリル化された有機繊維、硫化亜鉛、硫酸イオン吸着能を有する多孔質無機粒子の他に、通常摩擦材に使用される結合材、繊維基材、摩擦調整材、潤滑材、充填材を含む摩擦材組成物からなる。 The friction material of the present invention includes the above-mentioned pH adjusting material, fibrillated organic fiber, zinc sulfide, porous inorganic particles having sulfate ion adsorbing ability, as well as a binding material and a fiber base material that are normally used for friction materials. And a friction material composition including a friction modifier, a lubricant, and a filler.
結合材としては、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、アクリルゴムやシリコーン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やフルオロポリマー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 binders, straight phenol resin, phenol resin modified with cashew oil, various elastomers such as acrylic rubber and silicone rubber, aralkyl modified phenol obtained by reacting phenols, aralkyl ethers and aldehydes Examples of the binders are usually used for friction materials such as thermosetting resins in which various elastomers and fluoropolymers are dispersed in resins and phenol resins. These may be used alone or in combination of two or more. it can.
結合材の含有量は、充分な機械的強度、耐摩耗性を確保するため、摩擦材組成物全量に対して９～１５重量％とするのが好ましく、８～１２重量％とするのがより好ましい。 The content of the binder is preferably 9 to 15% by weight, more preferably 8 to 12% by weight, based on the total amount of the friction material composition in order to ensure sufficient mechanical strength and wear resistance. preferable.
繊維基材としては、上記のフィブリル化された有機繊維の他に、銅繊維、青銅繊維、真鍮繊維、アルミニウム繊維、アルミニウム―亜鉛合金繊維などの非鉄金属繊維等が挙げられ、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。 Examples of the fiber base material include non-ferrous metal fibers such as copper fibers, bronze fibers, brass fibers, aluminum fibers, and aluminum-zinc alloy fibers in addition to the above-described fibrillated organic fibers. It can be used alone or in combination of two or more.
繊維基材の含有量は上記フィブリル化された有機繊維と合わせて摩擦材組成物全量に対して５～２０重量％とするのが好ましく、７～１５重量％とするのがより好ましい。 The content of the fiber base material is preferably 5 to 20% by weight, more preferably 7 to 15% by weight, based on the total amount of the friction material composition together with the fibrillated organic fiber.
潤滑材としては、上記の硫化亜鉛の他に、二硫化モリブデン、硫化スズ、硫化鉄、複合金属硫化物等の金属硫化物系潤滑材や、人造黒鉛、天然黒鉛、薄片状黒鉛、石油コークス、弾性黒鉛化カーボン、酸化ポリアクリロニトリル繊維粉砕粉等の炭素質系潤滑材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使用することができる。 As the lubricant, in addition to the above zinc sulfide, metal sulfide-based lubricants such as molybdenum disulfide, tin sulfide, iron sulfide, composite metal sulfide, artificial graphite, natural graphite, flake graphite, petroleum coke, Lubricants usually used for friction materials such as carbonaceous lubricants such as elastic graphitized carbon and oxidized polyacrylonitrile fiber pulverized powder, etc. are mentioned, and these should be used alone or in combination of two or more. Can do.
潤滑材の含有量は上記硫化亜鉛と合わせて摩擦材組成物全量に対して３～８重量％とするのが好ましく、４～６重量％とするのがより好ましい。 The content of the lubricant is preferably 3 to 8% by weight, more preferably 4 to 6% by weight based on the total amount of the friction material composition together with the zinc sulfide.
無機系の摩擦調整材としては、上記多孔質無機粒子、チタン酸マグネシウムカリウムの他に、酸化ジルコニウム、ケイ酸ジルコニウム、酸化マグネシウム、α－アルミナ、タルク、マイカ、バーミキュライト、銅や真鍮等の各種金属粒子、チタン酸マグネシウムカリウム以外の板状のチタン酸塩や、複数の凸部を有する不定形状のチタン酸塩等の粒子状無機摩擦調整材や、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、生体溶解性セラミック繊維、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。 Examples of the inorganic friction modifier include various metals such as zirconium oxide, zirconium silicate, magnesium oxide, α-alumina, talc, mica, vermiculite, copper and brass in addition to the porous inorganic particles and magnesium potassium titanate. Particles, plate-like titanates other than magnesium potassium titanate, particulate inorganic friction modifiers such as irregularly shaped titanates having a plurality of convex portions, wollastonite, sepiolite, basalt fiber, glass fiber, Examples thereof include fibrous inorganic friction modifiers such as biosoluble ceramic fibers and rock wool, and these can be used alone or in combination of two or more.
無機系の摩擦調整材の含有量は上記多孔質無機粒子と合わせて摩擦材組成物全量に対して４０～５０重量％とするのが好ましく、４３～４７重量％とするのがより好ましい。 The content of the inorganic friction modifier is preferably 40 to 50% by weight, more preferably 43 to 47% by weight, based on the total amount of the friction material composition together with the porous inorganic particles.
有機系の摩擦調整材としては、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、ブチルゴム、シリコーン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 crushed powder of cashew dust, tire tread rubber, vulcanized rubber powder such as nitrile rubber, acrylic rubber, butyl rubber, silicone rubber, or unvulcanized rubber powder. These organic friction modifiers can be used, and these can be used alone or in combination of two or more.
有機系の摩擦調整材の含有量は摩擦材組成物全量に対して３～８重量％とするのが好ましく、４～７重量％とするのがより好ましい。
摩擦材組成物の残部としては、硫酸バリウム等の充填材を使用する。
The content of the organic friction modifier is preferably 3 to 8% by weight, more preferably 4 to 7% by weight, based on the total amount of the friction material composition.
As the balance of the friction material composition, a filler such as barium sulfate is used.
上記した原料のうち撥水性を持つのは、シリコーンゴム変性フェノール樹脂、シリコーンゴム分散フェノール樹脂、フルオロポリマー分散フェノール樹脂、シリコーンゴムの粉末や、シリコーンゴムやシリコーンオイルでコーティングした各種摩擦調整材等であり、これらの撥水性を持つ原料を使用する場合は、原料に含まれるシリコーンゴム、シリコーンオイルやフルオロポリマーの撥水性成分の合計が摩擦材組成物全量に対して０～０．５重量％となるように使用する。 Among the raw materials mentioned above, those having water repellency are silicone rubber-modified phenolic resin, silicone rubber-dispersed phenolic resin, fluoropolymer-dispersed phenolic resin, silicone rubber powder, and various friction modifiers coated with silicone rubber or silicone oil. When using these water-repellent raw materials, the total water-repellent components of the silicone rubber, silicone oil and fluoropolymer contained in the raw materials are 0 to 0.5% by weight based on the total amount of the friction material composition. Use to be.
また、摩擦材に含まれる銅成分に関しては、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ことから、銅を含む繊維や粒子等の銅成分はこれらの法規に適合するよう摩擦材組成物に添加するのが好ましく、銅成分は摩擦材組成物に添加しないことがより好ましい。 As for copper components contained in friction materials, sales of friction materials using friction materials containing 5.0% by weight or more of copper components in California and Washington State in the United States and assembly into new vehicles since 2021 Since 2023, there is a bill that prohibits the sale of friction materials using friction materials containing 0.5% by weight or more of copper components and their assembly into new cars. It is preferable to add the copper component such as to the friction material composition so as to conform to these regulations, and it is more preferable not to add the copper component to the friction material composition.
本発明の摩擦材は、所定量配合した摩擦材組成物を、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、表面処理し、接着材を塗布したバックプレートと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、スプレー塗装や静電粉体塗装により塗料を塗装する塗装工程、塗料を焼き付ける塗装焼き付け工程、回転砥石により摩擦面を形成する研磨工程を経て製造される。なお、加熱加圧成型工程の後、塗装工程、塗料焼き付けを兼ねた熱処理工程、研磨工程の順で製造する場合もある。 The friction material of the present invention comprises a mixing step in which a predetermined amount of the friction material composition is uniformly mixed using a mixer, and the resulting friction material raw material mixture is separately cleaned and surface-treated separately, The applied back plate is overlaid and put into a thermoforming mold, and heated and pressed to form by heating and pressing, the resulting molded product is heated to complete the curing reaction of the binder, spray coating, It is manufactured through a painting process in which paint is applied by electrostatic powder coating, a paint baking process in which paint is baked, and a polishing process in which a friction surface is formed by a rotating grindstone. In some cases, after the heat and pressure molding process, the coating process, the heat treatment process also serving as paint baking, and the polishing process are performed in this order.
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 preform and the kneaded product obtained in the kneading process are put into a preforming mold, and a preforming process for molding the preform is performed, and the scorch process is performed after the heat and pressure molding process.
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。 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.
［実施例１～２６・比較例１～５の摩擦材の製造方法］
表１～表３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３０ＭＰaにて１０秒間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、研磨して摩擦面を形成し、乗用車用ディスクブレーキパッドを作製した（実施例１～２６、比較例１～５）。
[Methods for producing friction materials of Examples 1 to 26 and Comparative Examples 1 to 5]
Friction material compositions having the compositions shown in Tables 1 to 3 were mixed for 5 minutes with a Redige mixer, and pre-molded by pressurizing at 30 MPa in a molding die for 10 seconds. This preform is placed on a steel back plate that has been washed, surface-treated, and coated with an adhesive, and molded in a thermoforming mold at a molding temperature of 150 ° C. and a molding pressure of 40 MPa for 10 minutes, and then 200 Heat treatment (post-curing) was carried out at 5 ° C. for 5 hours, and polishing was performed to form a friction surface, thereby producing disc brake pads for passenger cars (Examples 1 to 26, Comparative Examples 1 to 5).
これらのディスクブレーキパッドの錆固着について下記の条件で評価を行った。評価結果を表４～表６に示す。
＜評価＞
＜錆固着＞
以下に示した操作により実車（パーキングブレーキ内蔵リアブレーキ）で評価した。なお、ディスクロータは鋳鉄材（ＦＣ２５０）を使用した。
（１）すり合わせ
（２）水掛け
（３）制動（規定回数）
（４）パーキングブレーキをかけた状態で屋外に放置
上記（２）～（４）の操作を毎日繰り返し、試験７日目と試験１４日目における動き出しトルクを計測した。評価基準を以下に示す。
◎：５０Ｎｍ未満
○：５０Ｎｍ以上 ８０Ｎｍ未満
△：８０Ｎｍ以上 １５０Ｎｍ未満
×：１５０Ｎｍ以上
－：混合不良のため未評価
The rust adhesion of these disc brake pads was evaluated under the following conditions. The evaluation results are shown in Tables 4 to 6.
<Evaluation>
<Rust adhesion>
Evaluation was performed on an actual vehicle (rear brake with a built-in parking brake) by the following operations. The disc rotor was made of cast iron (FC250).
(1) Riding (2) Watering (3) Braking (specified number of times)
(4) Leaving outdoors with the parking brake applied The above operations (2) to (4) were repeated every day, and the starting torque on the 7th and 14th day of the test was measured. The evaluation criteria are shown below.
◎: Less than 50 Nm ○: 50 Nm or more, less than 80 Nm Δ: 80 Nm or more, less than 150 Nm ×: 150 Nm or more-: Not evaluated due to poor mixing
＜耐摩耗性＞
ＪＡＳＯ Ｃ４２７ 「自動車－ブレーキライニング及びディスクブレーキパッド－ダイナモメータ摩耗試験方法」に準拠し、制動初速度５０ｋｍ／ｈ、制動減速度０．３Ｇ、制動回数適宜、制動前ブレーキ温度２００℃の条件で、摩擦材の摩耗量（ｍｍ）を測定し、制動回数１０００回あたりの摩耗量に換算後、下記基準にて評価した。
◎ ： ０．１５未満
○ ： ０．１５以上 ０．２０未満
△ ： ０．２０以上 ０．５０未満
× ： ０．５０以上
－ ： 混合不良のため未評価
<Abrasion resistance>
In accordance with JASO C427 "Automobile-brake lining and disc brake pad-dynamometer wear test method", braking initial speed 50km / h, braking deceleration 0.3G, braking frequency as appropriate, brake temperature before braking 200 ° C, The amount of wear (mm) of the friction material was measured, converted into the amount of wear per 1000 times of braking, and then evaluated according to the following criteria.
: Less than 0.15
○: 0.15 or more and less than 0.20 △: 0.20 or more and less than 0.50 ×: 0.50 or more-: Not evaluated due to poor mixing
＜混合品の状態＞
摩擦材原料混合品の混合状態を目視にて確認した。
○：ファイバーボールの生成無し
×：ファイバーボールの生成有り
<State of mixed product>
The mixed state of the friction material raw material mixture was visually confirmed.
○: No generation of fiber balls ×: Generation of fiber balls
各表より看てとれるように、本発明の組成を満足するものは、良好な評価結果が得られている。パーキングブレーキ状態の自動車が高湿度下で長期間放置されても発錆の抑制効果が低下せず、錆固着を防止できていた。また、耐摩耗性が低下することなく、混合品の状態も良好であった。 As can be seen from each table, those satisfying the composition of the present invention have good evaluation results. Even if a car with a parking brake was left under high humidity for a long period of time, the effect of suppressing rusting did not decrease and rust sticking could be prevented. Moreover, the state of the mixed product was good without deteriorating the wear resistance.
本発明によれば、ディスクブレーキパッドに使用される、ＮＡＯ材の摩擦材組成物を成型した摩擦材において、銅成分の含有量に関する法規を満足しながら、パーキングブレーキ状態の自動車が高湿度下で長期間放置された場合でも発錆の抑制効果が低下せず、錆固着を防止することができる摩擦材を提供することができ、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 NAO material used for a disc brake pad, a vehicle in a parking brake state can be used under high humidity while satisfying the regulations regarding the content of copper components. Even when left for a long period of time, the effect of suppressing rusting does not decrease, and a friction material capable of preventing rust fixation can be provided, which has extremely high practical value.
Claims (7)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/876,201 US11448277B2 (en) | 2015-07-22 | 2016-07-15 | Friction material |
| KR1020187004746A KR20180032598A (en) | 2015-07-22 | 2016-07-15 | Friction material |
| CN201680042568.7A CN107849431B (en) | 2015-07-22 | 2016-07-15 | Friction material |
| EP16827733.3A EP3327099B1 (en) | 2015-07-22 | 2016-07-15 | Friction material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015145046 | 2015-07-22 | ||
| JP2015-145046 | 2015-07-22 | ||
| JP2016001976A JP6764216B2 (en) | 2015-07-22 | 2016-01-07 | Friction material |
| JP2016-001976 | 2016-01-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2017014173A1 true WO2017014173A1 (en) | 2017-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2016/070953 Ceased WO2017014173A1 (en) | 2015-07-22 | 2016-07-15 | Friction material |
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| WO (1) | WO2017014173A1 (en) |
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| CN110382654A (en) * | 2017-03-06 | 2019-10-25 | 日立化成株式会社 | Friction material composition, friction material, and friction member |
| JPWO2021246213A1 (en) * | 2020-06-02 | 2021-12-09 | ||
| FR3158548A1 (en) * | 2024-01-24 | 2025-07-25 | Stellantis Auto Sas | FRICTION MEMBER PROVIDED WITH LUMINESCENT MARKERS AND ASSOCIATED MANUFACTURING METHOD |
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