JP2008174705A - Friction material composition and friction material using the same - Google Patents

Friction material composition and friction material using the same Download PDF

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JP2008174705A
JP2008174705A JP2007115497A JP2007115497A JP2008174705A JP 2008174705 A JP2008174705 A JP 2008174705A JP 2007115497 A JP2007115497 A JP 2007115497A JP 2007115497 A JP2007115497 A JP 2007115497A JP 2008174705 A JP2008174705 A JP 2008174705A
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friction material
material composition
weight
inorganic powder
mohs hardness
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Mitsuaki Unno
光朗 海野
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Showa Denko Materials Co Ltd
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Hitachi Chemical Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a friction material composition for making a friction material which exhibits a good friction coefficient and prevents the occurrence of metal catch and the roughening of the surface of a facing material and is friendly to the environment; and to provide the friction material using the friction material composition. <P>SOLUTION: The friction material composition which comprises a fiber substrate, a binding material, an organic filler and an inorganic powder, characterized in that it contains an inorganic powder having a Mohs hardness of 5 or more and less than 7 in an amount of 7 to 30% by weight relative to the total weight of the friction material composition, an inorganic powder having a Mohs hardness of more than 7 in an amount of 0.5 to 4% by weight relative to the total weight of the friction material composition, and tin sulfide in an amount of 2 to 10% by weight relative to the total weight of the friction material composition. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、摩擦材組成物及び摩擦材組成物を用いた摩擦材に関する。   The present invention relates to a friction material composition and a friction material using the friction material composition.

自動車などには、その制動のためディスクブレーキパッド、ブレーキライニング等の摩擦材が使用されている。   In automobiles, friction materials such as disc brake pads and brake linings are used for braking.

現在、使用されている摩擦材、例えば、ディスクブレーキパッドは、アラミド繊維、鉱物繊維等の繊維状物質、カシューダストなどの摩擦調整剤を用いて制動時の鳴きや異音の発生の少ないノン−アスベストス−オーガニック(Non−Asbestos−Organic)(以下、NAO材とする)系のディスクブレーキパッドが多く用いられている。また、従来、耐磨耗性を向上させるために黒鉛や二硫化モリブデンを摩擦材に配合することが行われている。また、高温域での耐摩耗性を向上するため三硫化アンチモン、硫化鉛、酸化アンチモン等の固体潤滑剤を摩擦材に配合することが行なわれている(例えば、特許文献1〜3参照)。三硫化アンチモン、硫化鉛、酸化アンチモンを用いた摩擦材は、高温域での潤滑性が高く、対面材攻撃性が少ないため、対面材の摩耗粉の還元反応によるメタルキャッチ発生やメタルキャッチに起因する対面材表面の荒れが少ない。しかし、これら鉛化合物及びアンチモン化合物は環境問題への取り組みから使用を抑制する動きが高まっている。   Currently used friction materials, for example, disc brake pads, are non--reducing squeaks and abnormal noises during braking using a friction modifier such as fibrous materials such as aramid fibers and mineral fibers, and cashew dust. Asbestos-organic (hereinafter referred to as NAO) disc brake pads are often used. Conventionally, graphite or molybdenum disulfide is blended in the friction material in order to improve wear resistance. In addition, solid lubricants such as antimony trisulfide, lead sulfide, and antimony oxide are blended in the friction material in order to improve wear resistance at high temperatures (see, for example, Patent Documents 1 to 3). Friction materials using antimony trisulfide, lead sulfide, and antimony oxide have high lubricity at high temperatures and little attack on the facing material. The surface of the facing material is less rough. However, these lead compounds and antimony compounds are increasingly used to suppress their use due to environmental efforts.

近年では鉛化合物及びアンチモン化合物に代わる固体潤滑材として、鉛及びアンチモン以外の金属硫化物を用いた摩擦材が提案されている(例えば、特許文献4〜12参照)。しかし、これらの提案でも300℃以上、特に400℃以上の高温域でのメタルキャッチ発生や対面材表面の荒れを良好に防止し得ないという問題がある。一方、高温域でのメタルキャッチ発生を抑制する従来の手法として硫化チタン、硫化鉛、三硫化アンチモン及び金属複合硫化物を除く金属硫化物を3種以上含有したアンチモン及び鉛化合物を含まない摩擦材が提案されている(例えば、特許文献13参照)。特許文献13で具体的に開示されている摩擦材は金属硫化物の配合量が5体積%と多く、このような金属硫化物の添加量が多い摩擦材組成ではメタルキャッチ発生が抑制されるが、良好な摩擦係数を示す摩擦材が得られない。そこで、摩擦係数を向上するために研削効果の高い硬質の無機粉を摩擦材に添加すると、メタルキャッチ発生や対面材表面の荒れが発生し易くなるという問題があった。
特開平08−291223号公報 特開平06−129455号公報 特開平06−306185号公報 欧州特許出願第0654616B1号明細書 特開2005−024005号公報 特開2002−226834号公報 特開2003−301878号公報 特開昭54−000160号公報 特開昭54−109013号公報 特開平04−311789号公報 特開平07−083256号公報 特表平10−511732号公報 特開2003−313312号公報
In recent years, friction materials using metal sulfides other than lead and antimony have been proposed as solid lubricants in place of lead compounds and antimony compounds (see, for example, Patent Documents 4 to 12). However, these proposals also have a problem that it is not possible to satisfactorily prevent the occurrence of metal catch and the roughening of the facing material surface in a high temperature range of 300 ° C. or higher, particularly 400 ° C. or higher. On the other hand, as a conventional method for suppressing the occurrence of metal catch in a high temperature range, a friction material not containing antimony and lead compounds containing three or more metal sulfides excluding titanium sulfide, lead sulfide, antimony trisulfide and metal composite sulfide. Has been proposed (see, for example, Patent Document 13). The friction material specifically disclosed in Patent Document 13 has a large amount of metal sulfide as 5% by volume. In such a friction material composition with a large amount of addition of metal sulfide, the occurrence of metal catch is suppressed. Thus, a friction material exhibiting a good friction coefficient cannot be obtained. Therefore, when hard inorganic powder having a high grinding effect is added to the friction material in order to improve the friction coefficient, there is a problem that metal catching or roughening of the facing material surface is likely to occur.
Japanese Patent Laid-Open No. 08-291223 Japanese Patent Laid-Open No. 06-129455 Japanese Patent Laid-Open No. 06-306185 European Patent Application No. 0654616B1 JP 2005-024005 A Japanese Patent Laid-Open No. 2002-226834 Japanese Patent Laid-Open No. 2003-301878 JP-A-54-000160 Japanese Patent Laid-Open No. 54-109013 Japanese Patent Laid-Open No. 04-311789 Japanese Patent Application Laid-Open No. 07-083256 Japanese National Patent Publication No. 10-511732 JP 2003-313312 A

本発明は、良好な摩擦係数を示し、かつ高温域でもメタルキャッチ発生や対面材表面の荒れを防止し、環境負荷の少ない摩擦材を得るための摩擦材組成物及び摩擦材組成物を用いた摩擦材を提供することを目的とするものである。   The present invention uses a friction material composition and a friction material composition that exhibit a good friction coefficient, prevent occurrence of metal catch and rough surface of a facing material even in a high temperature range, and obtain a friction material with a low environmental load. The object is to provide a friction material.

本発明は、(1)繊維基質、結合材、有機充填材及び無機粉を含む摩擦材組成物において、モース硬度5以上7未満の無機粉を摩擦材組成物全重量に対して7〜30重量%、モース硬度7以上の無機粉を摩擦材組成物全重量に対して0.5〜4重量%及び硫化錫を摩擦材組成物全重量に対して2〜10重量%含むことを特徴とする摩擦材組成物に関する。   In the friction material composition including (1) a fiber substrate, a binder, an organic filler, and an inorganic powder, the present invention provides an inorganic powder having a Mohs hardness of 5 or more and less than 7 based on the total weight of the friction material composition. %, An inorganic powder having a Mohs hardness of 7 or more is contained in an amount of 0.5 to 4% by weight based on the total weight of the friction material composition, and tin sulfide is contained in an amount of 2 to 10% by weight based on the total weight of the friction material composition. The present invention relates to a friction material composition.

また、本発明は、(2)前記モース硬度5以上7未満の無機粉が、酸化ジルコニウム、四三酸化鉄の少なくとも1種以上であることを特徴とする前記(1)記載の摩擦材組成物に関する。   Further, the present invention provides (2) the friction material composition according to (1), wherein the inorganic powder having a Mohs hardness of 5 or more and less than 7 is at least one of zirconium oxide and iron trioxide. About.

また、本発明は、(3)前記モース硬度5以上7未満の無機粉が、平均粒径7μm以下の酸化ジルコニウムであることを特徴とする前記(1)又は(2)記載の摩擦材組成物に関する。   The present invention also provides (3) the friction material composition according to (1) or (2), wherein the inorganic powder having a Mohs hardness of 5 or more and less than 7 is zirconium oxide having an average particle size of 7 μm or less. About.

また、本発明は、(4)前記モース硬度7以上の無機粉が、珪酸ジルコニウムであることを特徴とする前記(1)〜(3)のいずれか一項に記載の摩擦材組成物に関する。   The present invention also relates to (4) the friction material composition according to any one of (1) to (3), wherein the inorganic powder having a Mohs hardness of 7 or more is zirconium silicate.

また、本発明は、(5)前記珪酸ジルコニウムの平均粒径が、1〜3μmであることを特徴とする前記(4)記載の摩擦材組成物に関する。   The present invention also relates to (5) the friction material composition according to (4), wherein the zirconium silicate has an average particle diameter of 1 to 3 μm.

また、本発明は、(6)コークスを摩擦材組成物全重量に対して1〜10重量%含むことを特徴とする前記(1)〜(5)のいずれか一項に記載の摩擦材組成物に関する。   Moreover, this invention contains 1-10 weight% of (6) coke with respect to friction material composition total weight, The friction material composition as described in any one of said (1)-(5) characterized by the above-mentioned. Related to things.

また、本発明は、(7)前記(1)〜(6)のいずれか一項に記載の摩擦材組成物を加熱加圧成形してなる摩擦材に関する。   The present invention also relates to (7) a friction material obtained by heat-pressing the friction material composition according to any one of (1) to (6).

本発明によれば、良好な摩擦係数を示し、かつ高温域でもメタルキャッチ発生や対面材表面の荒れを防止し、高温摩耗に優れ、環境負荷の少ない摩擦材組成物及び摩擦材組成物を用いた摩擦材を提供することができる。   According to the present invention, a friction material composition and a friction material composition exhibiting a good friction coefficient, preventing occurrence of metal catches and roughening of the facing material surface even in a high temperature range, excellent in high temperature wear, and having a low environmental load are used. It is possible to provide a friction material.

以下に、発明を実施するための最良の形態について、詳しく説明する。   Hereinafter, the best mode for carrying out the invention will be described in detail.

本発明の摩擦材組成物は、繊維基質、結合材、有機充填材及び無機粉を含む摩擦材組成物において、モース硬度5以上7未満の無機粉を摩擦材組成物全重量に対して7〜30重量%、モース硬度7以上の無機粉を摩擦材組成物全重量に対して0.5〜4重量%及び硫化錫を摩擦材組成物全重量に対して2〜10重量%含むことを特徴とする。   The friction material composition of the present invention is a friction material composition including a fiber substrate, a binder, an organic filler, and inorganic powder, wherein 7 to 7 inorganic powders having a Mohs hardness of 5 or more and less than 7 are included with respect to the total weight of the friction material composition. 30% by weight of inorganic powder having a Mohs hardness of 7 or more is contained in an amount of 0.5 to 4% by weight based on the total weight of the friction material composition and tin sulfide is contained in an amount of 2 to 10% by weight based on the total weight of the friction material composition. And

本発明で用いる繊維基質としては、特に制限はなく、例えば、無機繊維、有機繊維、金属繊維等の繊維物が挙げられる。具体的には、アラミド繊維、セルロース繊維、アクリル繊維等の有機繊維;銅繊維、青銅繊維、黄銅繊維等の金属繊維;チタン酸カリウム繊維、鉱物繊維、セラミック繊維、生分解性セラミック繊維等の無機繊維;等が挙げられる。これらの繊維基質は、単独で又は2種以上を組み合わせて使用される。また、これらの繊維基質は、繊維状、粉末状で用いられる。繊維基質の含有量は、摩擦材組成物全重量に対して5〜50重量%であることが好ましく、10〜30重量%であることがより好ましい。前記繊維基質の含有量が5重量%未満である場合は、摩擦材の欠損、クラックに対する強度低下及び耐磨耗性の低下の傾向にあり、一方、50重量%を超える場合は、摩擦材として成形する際に成形性に劣る傾向にある。
本発明で用いる結合材としては、特に制限はなく、摩擦材に通常用いられる熱硬化性樹脂を用いることができる。熱硬化性樹脂としては、例えば、フェノール樹脂、アクリル変性フェノール樹脂、シリコーン変性フェノール樹脂、カシュー変性フェノール樹脂、エポキシ変性フェノール樹脂、アルキルベンゼン変性フェノール樹脂等の各種変性フェノール樹脂又は未変性フェノール樹脂などが挙げられ、これらは単独で又は2種以上を組み合わせて使用される。結合材の含有量は、摩擦材組成物全重量に対して5〜20重量%であることが好ましく、6〜12重量%であることがより好ましい。前記結合材の含有量が5重量%未満である場合は、摩擦材として成形する際に成形性に劣る傾向にあり、一方、20重量%を超える場合は、柔軟性が低くなり、鳴き等の音振性能が悪くなる傾向にある。
There is no restriction | limiting in particular as a fiber substrate used by this invention, For example, fiber goods, such as an inorganic fiber, an organic fiber, and a metal fiber, are mentioned. Specifically, organic fibers such as aramid fiber, cellulose fiber and acrylic fiber; metal fibers such as copper fiber, bronze fiber and brass fiber; inorganic such as potassium titanate fiber, mineral fiber, ceramic fiber and biodegradable ceramic fiber Fiber; and the like. These fiber substrates are used alone or in combination of two or more. Further, these fiber substrates are used in the form of fibers or powders. The content of the fiber substrate is preferably 5 to 50% by weight, more preferably 10 to 30% by weight, based on the total weight of the friction material composition. When the content of the fiber substrate is less than 5% by weight, there is a tendency for the friction material to be deficient, the strength against cracks and the wear resistance to be decreased, and when the content exceeds 50% by weight, the friction material When molding, the formability tends to be inferior.
There is no restriction | limiting in particular as a binder used by this invention, The thermosetting resin normally used for a friction material can be used. Examples of the thermosetting resin include various modified phenol resins such as phenol resin, acrylic modified phenol resin, silicone modified phenol resin, cashew modified phenol resin, epoxy modified phenol resin, alkylbenzene modified phenol resin, or unmodified phenol resin. These are used alone or in combination of two or more. The content of the binder is preferably 5 to 20% by weight and more preferably 6 to 12% by weight with respect to the total weight of the friction material composition. When the content of the binder is less than 5% by weight, it tends to be inferior in moldability when molded as a friction material, while when it exceeds 20% by weight, the flexibility becomes low and squealing, etc. Sound vibration performance tends to deteriorate.

本発明で用いる有機充填材は、特に制限はなく、例えば、カシューダスト、タイヤゴム粉、アクリルゴム粉等が挙げられ、これらは単独で又は2種以上を組み合わせて使用される。有機充填材の含有量は、摩擦材組成物全重量に対して2〜20重量%であることが好ましく、4〜10重量%であることがより好ましい。前記有機充填材の含有量が、2重量%未満である場合は、柔軟性が低くなり、鳴き等の音振性能が悪くなる傾向にあり、一方、20重量%を超える場合は、圧縮変形量が増加し、引きずり、効きフィーリングが悪くなる傾向にある。   There is no restriction | limiting in particular in the organic filler used by this invention, For example, cashew dust, tire rubber powder, acrylic rubber powder etc. are mentioned, These are used individually or in combination of 2 or more types. The content of the organic filler is preferably 2 to 20% by weight and more preferably 4 to 10% by weight with respect to the total weight of the friction material composition. When the content of the organic filler is less than 2% by weight, flexibility tends to be low and sound vibration performance such as squeal tends to deteriorate, whereas when it exceeds 20% by weight, the amount of compression deformation Tends to increase, drag, and feel poor.

本発明で用いる無機粉は、モース硬度5以上7未満の無機粉、モース硬度7以上の無機粉及び硫化錫を含むものであり、摩擦材組成物全重量に対するそれらの含有量が重要である。   The inorganic powder used in the present invention contains an inorganic powder having a Mohs hardness of 5 or more and less than 7, an inorganic powder having a Mohs hardness of 7 or more, and tin sulfide, and their content relative to the total weight of the friction material composition is important.

モース硬度5以上7未満の無機粉の含有量は、摩擦材組成物全重量に対して7〜30重量%であり、好ましくは15〜28重量%である。前記モース硬度5以上7未満の無機粉の含有量が7重量%未満である場合は、低速から高速まで効力が大きく低下し、良好な摩擦係数が得られない。一方、前記モース硬度5以上7未満の無機粉の含有量が30重量%を超える場合は、メタルキャッチ発生及び対面材の荒れの程度が急激に大きくなる。   The content of the inorganic powder having a Mohs hardness of 5 or more and less than 7 is 7 to 30% by weight, preferably 15 to 28% by weight, based on the total weight of the friction material composition. When the content of the inorganic powder having a Mohs hardness of 5 or more and less than 7 is less than 7% by weight, the effectiveness is greatly reduced from a low speed to a high speed, and a good friction coefficient cannot be obtained. On the other hand, when the content of the inorganic powder having a Mohs hardness of 5 or more and less than 7 exceeds 30% by weight, the occurrence of metal catch and the roughness of the facing material increase rapidly.

モース硬度7以上の無機粉の含有量は、摩擦材組成物全重量に対して0.5〜4重量%であり、好ましくは1〜3重量%である。前記モース硬度7以上の無機粉の含有量が0.5未満である場合は、
である。一方、前記モース硬度7以上の無機粉の含有量が4重量%を超える場合は、メタルキャッチ発生及び対面材の荒れの程度が急激に大きくなる。
The content of the inorganic powder having a Mohs hardness of 7 or more is 0.5 to 4% by weight, preferably 1 to 3% by weight, based on the total weight of the friction material composition. When the content of the inorganic powder having a Mohs hardness of 7 or more is less than 0.5,
It is. On the other hand, when the content of the inorganic powder having a Mohs hardness of 7 or more exceeds 4% by weight, the degree of occurrence of metal catch and the roughness of the facing material increase rapidly.

硫化錫の含有量は、摩擦材組成物全重量に対して2〜10重量%であり、好ましくは3〜8重量%である。の範囲とされ、前記硫化錫の含有量が2重量%未満である場合は、メタルキャッチ発生及び対面材の荒れの程度が大きくなる。一方、前記硫化錫の含有量が10重量%を超える場合は、低速から高速まで効力が大きく低下し、良好な摩擦係数が得られない。   The content of tin sulfide is 2 to 10% by weight, preferably 3 to 8% by weight, based on the total weight of the friction material composition. When the content of the tin sulfide is less than 2% by weight, the occurrence of metal catch and the roughness of the facing material increase. On the other hand, when the content of the tin sulfide exceeds 10% by weight, the effectiveness is greatly reduced from low speed to high speed, and a good friction coefficient cannot be obtained.

モース硬度5以上7未満の無機粉としては、酸化ジルコニウム(モース硬度:6)、四三酸化鉄(モース硬度:6.5)、酸化マグネシウム(モース硬度:6.5)、酸化チタン(モース硬度:6.5)などが例示される。これらのなかでも、酸化ジルコニウム及び/又は四三酸化鉄は、メタルキャッチ発生の防止及び対面材の荒れの防止を向上し、良好な摩擦係数を示すという点でより好ましい。また、メタルキャッチ発生の防止及び対面材の荒れの防止を向上する点で、酸化ジルコニウムの平均粒径は7μm以下であることが好ましい。   Examples of inorganic powders having a Mohs hardness of 5 or more and less than 7 include zirconium oxide (Mohs hardness: 6), triiron tetroxide (Mohs hardness: 6.5), magnesium oxide (Mohs hardness: 6.5), and titanium oxide (Mohs hardness). : 6.5). Among these, zirconium oxide and / or triiron tetroxide are more preferable in terms of improving the prevention of metal catch and the roughening of the facing material and exhibiting a good coefficient of friction. Moreover, it is preferable that the average particle diameter of a zirconium oxide is 7 micrometers or less at the point which improves prevention of metal catch generation | occurrence | production and roughening of a facing material.

モース硬度が7以上の無機粉としては、珪酸ジルコニウム(モース硬度:7.5)、酸化アルミニウム(モース硬度:9)、炭化珪素(モース硬度:10)、シリカ(モース硬度:7)などが例示される。これらのなかでも、メタルキャッチ発生を防止し易い点で、珪酸ジルコニウムが好ましい。また、対面材への攻撃性が少ない点で、珪酸ジルコニウムの平均粒径は1〜3μmであることが好ましい。   Examples of inorganic powders having a Mohs hardness of 7 or more include zirconium silicate (Mohs hardness: 7.5), aluminum oxide (Mohs hardness: 9), silicon carbide (Mohs hardness: 10), silica (Mohs hardness: 7), and the like. Is done. Among these, zirconium silicate is preferable because it is easy to prevent the occurrence of metal catch. Moreover, it is preferable that the average particle diameter of a zirconium silicate is 1-3 micrometers in the point with few aggression property to a facing material.

本発明に用いられる無機粉は、前述したモース硬度5以上7未満の無機粉、モース硬度7以上の無機粉及び硫化錫以外の無機粉を含んでいてもよく、例えば、コークス、硫酸カルシウム、硫酸バリウム、黒鉛、マイカ、バーミキュライト、水酸化カルシウム、酸化カルシウム、ゼオライト、炭酸カルシウム、リン酸カルシウム、銅粉、亜鉛粉等が挙げられ、これらは単独で又は2種以上を組み合わせて使用される。これらのなかでも、メタルキャッチ発生の防止及び対面材の荒れの防止をより向上するために、コークスが好ましく、摩擦材組成物全重量に対して1〜10重量%を含むことが好ましい。   The inorganic powder used in the present invention may contain the inorganic powder having a Mohs hardness of 5 to less than 7, the inorganic powder having a Mohs hardness of 7 or more, and an inorganic powder other than tin sulfide, such as coke, calcium sulfate, sulfuric acid. Examples thereof include barium, graphite, mica, vermiculite, calcium hydroxide, calcium oxide, zeolite, calcium carbonate, calcium phosphate, copper powder, and zinc powder, and these are used alone or in combination of two or more. Among these, in order to further improve prevention of occurrence of metal catch and prevention of roughening of the facing material, coke is preferable, and it is preferable to include 1 to 10% by weight with respect to the total weight of the friction material composition.

また、本発明の摩擦材組成物は、環境への負荷を低減するために三硫化アンチモン、硫化鉛、酸化アンチモンを含まないことが好ましい。
本発明の摩擦材組成物における無機粉の含有量は、摩擦材組成物全重量に対して10〜80重量%であることが好ましく、20〜70重量%であることがより好ましい。
Further, the friction material composition of the present invention preferably contains no antimony trisulfide, lead sulfide, or antimony oxide in order to reduce the environmental load.
The content of the inorganic powder in the friction material composition of the present invention is preferably 10 to 80% by weight and more preferably 20 to 70% by weight with respect to the total weight of the friction material composition.

本発明の摩擦材は、本発明の摩擦材組成物を加熱加圧成形してなるものである。具体的には、本発明の摩擦材組成物をレディーゲミキサー、加圧ニーダー等の混合機を用いて均一に混合し、この混合した配合粉を予備成形し、得られた予備成形物を成形温度130〜160℃、成形圧力20〜50MPaで3〜12分間成形し、得られた成形品を150℃〜250℃で2〜10時間熱処理し、必要に応じて塗装、スコーチ処理、研磨処理を行って得られる。   The friction material of the present invention is obtained by heat-pressing the friction material composition of the present invention. Specifically, the friction material composition of the present invention is uniformly mixed by using a mixer such as a Readyge mixer or a pressure kneader, the mixed powder is preformed, and the resulting preform is molded. Molding is performed at a temperature of 130 to 160 ° C. and a molding pressure of 20 to 50 MPa for 3 to 12 minutes, and the obtained molded product is heat-treated at 150 to 250 ° C. for 2 to 10 hours, and coating, scorch treatment, and polishing treatment are performed as necessary. Obtained by going.

以下、実施例により、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するものではない。   EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to the following examples.

実施例1〜8
表1に示す組成に従って各成分を配合し、レディーゲミキサーを用いて10分間均一に混合して摩擦材組成物を得た。この摩擦材組成物を予備成形し、得られた予備成形物を成形温度145℃、成形圧力30MPaの条件で5分間熱圧成形した。次いで、得られた成形物を200℃で4.5時間熱処理し、研磨処理、スコーチ処理を行ってブレーキパッドを作製した。
Examples 1-8
Each component was blended according to the composition shown in Table 1, and mixed uniformly for 10 minutes using a Readyge mixer to obtain a friction material composition. This friction material composition was preformed, and the obtained preform was hot-press molded for 5 minutes under the conditions of a molding temperature of 145 ° C. and a molding pressure of 30 MPa. Next, the obtained molded product was heat-treated at 200 ° C. for 4.5 hours, and subjected to polishing treatment and scorch treatment to produce a brake pad.

得られたブレーキパッドについて以下の評価方法により温度別摩耗試験及び効力試験を行った。結果を表1に示す。   The obtained brake pads were subjected to a temperature-specific wear test and efficacy test according to the following evaluation methods. The results are shown in Table 1.

また、使用した各成分の詳細は表2に示す。   Details of each component used are shown in Table 2.

比較例1〜5
表2に示す組成に従って各成分を配合し、実施例1〜8と同様に操作してブレーキパッドを作製した。
Comparative Examples 1-5
Each component was blended according to the composition shown in Table 2, and the same operation as in Examples 1 to 8 was performed to prepare a brake pad.

得られたブレーキパッドについて実施例1〜8と同様の評価方法により温度別摩耗試験及び効力試験を行った。結果を表2に示す。   About the obtained brake pad, the abrasion test according to temperature and the efficacy test were done by the same evaluation method as Examples 1-8. The results are shown in Table 2.

また、使用した各成分の詳細は表3に示す。   Details of each component used are shown in Table 3.

評価方法
温度別摩耗試験:JASO C427に従い、34.2kg・mの慣性モーメントで試験を行った。制動前ブレーキ温度100℃、200℃、300℃、400℃及び500℃試験時のパッド摺動面のメタルキャッチ発生度合い及びロータ表面の荒れ度合いを評価した。パッド摺動面のメタルキャッチ発生度合い及びロータ表面の荒れ度合いに関しては、以下の基準にて評価した。
Evaluation method Wear test according to temperature: According to JASO C427, the test was conducted with an inertia moment of 34.2 kg · m 2 . Brake temperature before braking 100 ° C., 200 ° C., 300 ° C., 400 ° C. and 500 ° C. The degree of occurrence of metal catch on the sliding surface of the pad and the degree of roughness of the rotor surface were evaluated. The degree of occurrence of metal catch on the pad sliding surface and the roughness of the rotor surface were evaluated according to the following criteria.

・パッド摺動面のメタルキャッチ発生度合い
◎:メタルキャッチが無い。
○:直径3mm以下のメタルキャッチが1個ある。
△:直径3mm以下のメタルキャッチが2個以上ある。
×:直径3mm以上のメタルキャッチがある。
・ロータ表面の荒れ度合い
◎:表面の荒れが無い。
○:表面に1〜3本の線傷がある。
△:表面に4本以上の線傷がある。
×:ロータ表面の金属光沢部の面積が、ロータ表面の全面積に対し、30%以上ある。
・ Degree of metal catch on pad sliding surface ◎: No metal catch.
○: There is one metal catch having a diameter of 3 mm or less.
Δ: There are two or more metal catches having a diameter of 3 mm or less.
X: There is a metal catch having a diameter of 3 mm or more.
・ Roughness of rotor surface ◎: There is no surface roughness.
◯: There are 1 to 3 flaws on the surface.
Δ: There are four or more flaws on the surface.
X: The area of the metallic luster part on the rotor surface is 30% or more with respect to the total area of the rotor surface.

効力試験:JASO C406に従い、34.2kg・mの慣性モーメントで試験を行った。第2効力での初速50km/h、100km/h、130km/h及び減速度0.3Gでの摩擦係数を評価した。

Figure 2008174705
Figure 2008174705
Figure 2008174705
Efficacy test: The test was conducted according to JASO C406 at a moment of inertia of 34.2 kg · m 2 . The coefficient of friction was evaluated at an initial speed of 50 km / h, 100 km / h, 130 km / h and a deceleration of 0.3 G with the second efficacy.
Figure 2008174705
Figure 2008174705
Figure 2008174705

表1に示されるように、実施例1〜8のブレーキパッドは、良好な摩擦係数を示し、かつメタルキャッチ発生や対面材表面の荒れを防止し、環境負荷の少ないことが明らかである。これに対し、表2に示されるように、比較例1〜5のブレーキパッドは、摩擦係数が劣る、メタルキャッチ発生や対面材表面の荒れが多い、環境負荷が多いなど、いずれかに欠点があることが明らかである。   As shown in Table 1, it is clear that the brake pads of Examples 1 to 8 show a good coefficient of friction, prevent the occurrence of metal catches and the surface of the facing material, and have a low environmental load. On the other hand, as shown in Table 2, the brake pads of Comparative Examples 1 to 5 have inferior coefficients of friction, there are many occurrences of metal catch and surface roughness of the facing material, and there are many environmental loads. It is clear that there is.

Claims (7)

繊維基質、結合材、有機充填材及び無機粉を含む摩擦材組成物において、モース硬度5以上7未満の無機粉を摩擦材組成物全重量に対して7〜30重量%、モース硬度7以上の無機粉を摩擦材組成物全重量に対して0.5〜4重量%及び硫化錫を摩擦材組成物全重量に対して2〜10重量%含むことを特徴とする摩擦材組成物。   In a friction material composition including a fiber substrate, a binder, an organic filler, and inorganic powder, the inorganic powder having a Mohs hardness of 5 or more and less than 7 is 7 to 30% by weight, based on the total weight of the friction material composition, and having a Mohs hardness of 7 or more. A friction material composition comprising 0.5 to 4% by weight of inorganic powder and 2 to 10% by weight of tin sulfide based on the total weight of the friction material composition. 前記モース硬度5以上7未満の無機粉が、酸化ジルコニウム、四三酸化鉄の少なくとも1種以上であることを特徴とする請求項1記載の摩擦材組成物。   The friction material composition according to claim 1, wherein the inorganic powder having a Mohs hardness of 5 or more and less than 7 is at least one of zirconium oxide and iron trioxide. 前記モース硬度5以上7未満の無機粉が、平均粒径7μm以下の酸化ジルコニウムであることを特徴とする請求項1又は2記載の摩擦材組成物。   The friction material composition according to claim 1, wherein the inorganic powder having a Mohs hardness of 5 or more and less than 7 is zirconium oxide having an average particle diameter of 7 μm or less. 前記モース硬度7以上の無機粉が、珪酸ジルコニウムであることを特徴とする請求項1〜3のいずれか一項に記載の摩擦材組成物。   The friction material composition according to any one of claims 1 to 3, wherein the inorganic powder having a Mohs hardness of 7 or more is zirconium silicate. 前記珪酸ジルコニウムの平均粒径が、1〜3μmであることを特徴とする請求項4記載の摩擦材組成物。   The friction material composition according to claim 4, wherein the zirconium silicate has an average particle diameter of 1 to 3 μm. コークスを摩擦材組成物全重量に対して1〜10重量%含むことを特徴とする請求項1〜5のいずれか一項に記載の摩擦材組成物。   The friction material composition according to any one of claims 1 to 5, wherein coke is contained in an amount of 1 to 10% by weight based on the total weight of the friction material composition. 請求項1〜6のいずれか一項に記載の摩擦材組成物を加熱加圧成形してなる摩擦材。   The friction material formed by heat-press-molding the friction material composition as described in any one of Claims 1-6.
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Cited By (5)

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JP2012255052A (en) * 2011-06-07 2012-12-27 Hitachi Chemical Co Ltd Non-asbestos friction material composition
JP2016188378A (en) * 2016-06-22 2016-11-04 日立化成株式会社 Non-asbestos friction material composition
US20170030426A1 (en) * 2014-04-17 2017-02-02 Nisshinbo Brake, Inc. Friction material
JP2019206627A (en) * 2018-05-28 2019-12-05 株式会社アドヴィックス Friction material and friction material composition
JP2020117726A (en) * 2020-04-09 2020-08-06 日立化成株式会社 Friction material, and friction member

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012255052A (en) * 2011-06-07 2012-12-27 Hitachi Chemical Co Ltd Non-asbestos friction material composition
US20170030426A1 (en) * 2014-04-17 2017-02-02 Nisshinbo Brake, Inc. Friction material
US9689449B2 (en) * 2014-04-17 2017-06-27 Nisshinbo Brake, Inc. Friction material
JP2016188378A (en) * 2016-06-22 2016-11-04 日立化成株式会社 Non-asbestos friction material composition
JP2019206627A (en) * 2018-05-28 2019-12-05 株式会社アドヴィックス Friction material and friction material composition
WO2019230673A1 (en) * 2018-05-28 2019-12-05 株式会社アドヴィックス Friction material and friction material composition
JP2020117726A (en) * 2020-04-09 2020-08-06 日立化成株式会社 Friction material, and friction member
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