JP3505190B2 - Non-asbestos friction material - Google Patents
Non-asbestos friction materialInfo
- Publication number
- JP3505190B2 JP3505190B2 JP11075691A JP11075691A JP3505190B2 JP 3505190 B2 JP3505190 B2 JP 3505190B2 JP 11075691 A JP11075691 A JP 11075691A JP 11075691 A JP11075691 A JP 11075691A JP 3505190 B2 JP3505190 B2 JP 3505190B2
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- friction material
- asbestos
- potassium titanate
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Braking Arrangements (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車のディスクブレ
ーキ，ドラムブレーキ，クラッチフェーシング等として
使用される摩擦材であって、繊維成分として石綿を含ま
ず、耐摩耗性及び高温時の強度が優れた非石綿系摩擦材
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material used as an automobile disc brake, a drum brake, a clutch facing, etc., which does not contain asbestos as a fiber component and is excellent in wear resistance and strength at high temperature. Non-asbestos friction material.
【０００２】[0002]
【従来の技術】従来、自動車のディスクブレーキ，ドラ
ムブレーキ，クラッチフェーシング等に使用される摩擦
材は、その基材として石綿が多く使用されていたが、石
綿はその粉塵が人体への有害性を指摘された結果、その
使用を規制されつつあり、石綿を使用しない摩擦材に対
する要求が強くなってきている。2. Description of the Related Art Conventionally, asbestos has been often used as a base material for friction materials used for automobile disc brakes, drum brakes, clutch facings, etc. However, asbestos is harmful to humans due to its dust. As a result of being pointed out, its use is being regulated, and there is a strong demand for friction materials that do not use asbestos.
【０００３】そこで、石綿を使用しない非石綿系摩擦材
について多くの提案がなされているが、それらの多くは
繊維成分として耐熱性有機繊維，ガラス繊維，金属繊維
を用い、結合材としてフェノール樹脂等の熱硬化性樹脂
を、充填材成分として黒鉛，硫酸バリウム，アルミナ等
を用いたものである。Therefore, many proposals have been made for non-asbestos-based friction materials that do not use asbestos, but most of them use heat-resistant organic fibers, glass fibers, and metal fibers as fiber components, and phenol resin as a binder. The above thermosetting resin is used as a filler component such as graphite, barium sulfate, and alumina.
【０００４】[0004]
【発明が解決しようとする課題】然し乍ら、結合材とし
て上記フェノール樹脂等の熱硬化性樹脂を使用した非石
綿系摩擦材は、高温下では前記樹脂が溶解または分解し
てガスが発生し、フェード現象を起こして摩擦係数が不
安定になるばかりでなく、強度も比較的低いという問題
がある。この問題を解決するために、前記樹脂成分を摩
擦材全量の１５〜２５体積％と少量に抑えているのが現
状であるが、有機結合材を減少させると摩擦材の耐摩耗
性及び強度の低下が大きくなる。However, a non-asbestos-based friction material using a thermosetting resin such as the above-mentioned phenol resin as a binder has a problem that the resin is dissolved or decomposed at a high temperature to generate gas and fade. Not only does this cause a phenomenon that the coefficient of friction becomes unstable, but also the strength is relatively low. In order to solve this problem, it is the current situation that the resin component is suppressed to a small amount of 15 to 25% by volume of the total amount of the friction material. However, if the organic binder is reduced, the wear resistance and strength of the friction material are improved. The drop is large.
【０００５】そこで、繊維成分中に金属繊維を多く含ま
せたり，充填材成分中に金属粉を多量に使用したものも
考えられたが、これらの摩擦材は高温時の耐摩耗性や強
度等には優れているものの、重量が重かったり，高温時
に発火しやすい等の問題点がある。Therefore, it has been considered that a large amount of metal fibers are contained in the fiber component or a large amount of metal powder is used in the filler component, but these friction materials have wear resistance and strength at high temperature. Although it is excellent, there are problems such as heavy weight and easy ignition at high temperature.
【０００６】従って本発明が解決しようとする課題は、
上記の非石綿系摩擦材において低温から高温までの摩擦
性能，耐フェード性等が良好で、耐摩耗性及び高温時の
強度が優れた非石綿系摩擦材を提供することである。Therefore, the problem to be solved by the present invention is
It is an object of the present invention to provide a non-asbestos-based friction material which has good friction performance from low temperature to high temperature, fade resistance, etc., and is excellent in wear resistance and strength at high temperature.
【０００７】[0007]
【課題を解決するための手段】本発明は上記の課題を解
決することを目的としてなされたもので、その構成は、
石綿以外の有機繊維を含む繊維成分（アスペクト比８以
下のチタン酸カリウムは除く）と、熱硬化性樹脂成分
と、黒鉛，硫酸バリウムを含む充填材成分とを含有する
摩擦材において、前記繊維成分中のガラス繊維は摩擦材
全量に対し15体積％未満で、かつ、前記充填材成分にア
スペクト比８以下のチタン酸カリウム粉末を含むことを
特徴とするものである。The present invention has been made for the purpose of solving the above-mentioned problems, and its constitution is as follows.
A friction material comprising a fiber component containing organic fibers other than asbestos (excluding potassium titanate having an aspect ratio of 8 or less), a thermosetting resin component, and a filler component containing graphite and barium sulfate. The glass fiber therein is characterized in that it is less than 15% by volume with respect to the total amount of the friction material, and the filler component contains potassium titanate powder having an aspect ratio of 8 or less.
【０００８】チタン酸カリウム繊維を使用した摩擦材と
して特開昭５９−２０７９８０号、及び特開昭６３−６
２９２６号が開示されているが、チタン酸カリウム繊維
を含む摩擦材においては高温履歴後に強度が低下すると
いう現象が起こる。これを防止するためには摩擦材の気
孔率を小さくし、緻密な構造にして熱劣化を防止するこ
とが有効である。このように緻密な構造にするには、結
合材であるフェノール樹脂等の熱硬化性樹脂を増やすこ
とで可能であるが、この方法を用いると耐フェード性や
鳴き性能の悪化を招くことになる。As a friction material using potassium titanate fiber, JP-A-59-207980 and JP-A-63-6.
No. 2926 is disclosed, but in a friction material containing potassium titanate fibers, a phenomenon that the strength decreases after a high temperature history occurs. In order to prevent this, it is effective to reduce the porosity of the friction material so as to have a dense structure and prevent thermal deterioration. Such a dense structure can be obtained by increasing the amount of thermosetting resin such as phenol resin as a binder, but this method causes deterioration of fade resistance and squealing performance. .
【０００９】そこで、本発明の発明者らは、特に高温時
の耐摩耗性及び強度の優れた非石綿系摩擦材を得ること
を目的として研究を重ねた結果、充填材成分の一部にチ
タン酸カリウム粉末を含ませることにより上記の目的を
達成できることを知得し、本発明を成し遂げたのであ
る。Therefore, the inventors of the present invention have conducted extensive research for the purpose of obtaining a non-asbestos-based friction material having excellent wear resistance and strength especially at high temperatures, and as a result, titanium has been used as a part of the filler component. The inventors have realized that the above object can be achieved by including a potassium acid powder, and accomplished the present invention.
【００１０】尚、上記におけるチタン酸カリウム粉末の
含有量は摩擦材全量に対し１〜30体積％が望ましく、１
％以下では効果が少なく，30％以上では摩擦係数の安定
性が悪くなる。The content of the potassium titanate powder in the above is preferably 1 to 30% by volume with respect to the total amount of the friction material.
% Or less, the effect is small, and 30% or more results in poor stability of the friction coefficient.
【００１１】而して、本発明において繊維成分として使
用されるものには、アラミド繊維等の有機繊維、ガラス
繊維，ロックウール，セラミックス繊維，チタン酸カリ
ウム繊維等の無機繊維、銅，青銅，アルミニウム，黄銅
等の金属繊維が挙げられる。また結合材としては、フェ
ノール樹脂，尿素樹脂，メラミン樹脂またはそれらの変
性樹脂のような熱硬化性樹脂やポリアセタール、芳香族
ポリイミド樹脂，フッ素樹脂等の耐熱性樹脂が挙げら
れ、充填材成分としてはチタン酸カリウム粉末の他、黒
鉛，金属粉，二硫化モリブデン，カシューダストのよう
な潤滑作用のあるものや、硫酸バリウム，炭酸カルシウ
ム等が挙げられる。なお、上記の繊維成分中にガラス繊
維を配合する場合は、ガラス繊維は摩擦材全量に対し15
体積％未満とする。The fibers used in the present invention include organic fibers such as aramid fibers, glass fibers, rock wool, ceramic fibers, inorganic fibers such as potassium titanate fibers, copper, bronze and aluminum. , Metal fibers such as brass. Examples of the binder include thermosetting resins such as phenolic resin, urea resin, melamine resin and modified resins thereof, and heat resistant resins such as polyacetal, aromatic polyimide resin, and fluororesin. In addition to potassium titanate powder, graphite, metal powder, molybdenum disulfide, cashew dust, etc. having a lubricating action, barium sulfate, calcium carbonate and the like can be mentioned. When glass fiber is mixed in the above fiber component, the glass fiber is 15 with respect to the total amount of friction material.
It is less than volume%.
【００１２】[0012]
【発明の作用】本発明摩擦材は非石綿系摩擦材であっ
て、充填材成分の少なくとも一部にチタン酸カリウム粉
末を用いることにより、耐摩耗性及び高温時の強度が向
上する。The friction material of the present invention is a non-asbestos friction material. By using potassium titanate powder as at least a part of the filler component, wear resistance and strength at high temperature are improved.
【００１３】[0013]
【実施例】次に本発明の実施例について説明する。繊維
成分としてアラミド繊維，ロックウール，銅繊維，チタ
ン酸カリウム繊維を、結合材としてフェノール樹脂を、
充填材成分としてチタン酸カリウム粉末の他、黒鉛，硫
酸バリウム，カシューダストを、その他の成分として摩
擦調整剤を用いてこれらを均一に混合し、室温，圧力４
００kg／cm2 で予備成型した後、温度１５０℃，圧力４
００kg／cm2 で１０分間加熱加圧成型し次いで温度１８
０℃で５時間熱処理して表１に示す組成の実施例Ａ〜Ｃ
の非石綿系摩擦材を得た。同様にしてチタン酸カリウム
粉末を除いた比較例ａ〜ｃの非石綿系摩擦材を得た。
尚，表中の数値は体積％を表す。EXAMPLES Next, examples of the present invention will be described. Aramid fiber, rock wool, copper fiber, potassium titanate fiber as the fiber component, phenol resin as the binder,
In addition to potassium titanate powder as a filler component, graphite, barium sulfate, and cashew dust are uniformly mixed using a friction modifier as another component, and the mixture is kept at room temperature and pressure of 4
After pre-molding with 00kg / cm 2 , temperature 150 ℃, pressure 4
Heat and pressure molding at 00 kg / cm 2 for 10 minutes, then temperature 18
Examples A to C having the compositions shown in Table 1 after heat treatment at 0 ° C. for 5 hours
A non-asbestos-based friction material was obtained. Similarly, non-asbestos-based friction materials of Comparative Examples a to c from which potassium titanate powder was removed were obtained.
The numerical values in the table represent volume%.
【００１４】これらの非石綿系摩擦材につき摩擦性能試
験 (JASO C406-82) , 耐摩耗試験 (JASO C427-83) 及び
耐摩耗試験後の剪断強度試験 (JASO C444-78) を行なっ
た結果を表２に示す。A friction performance test (JASO C406-82), an abrasion resistance test (JASO C427-83), and a shear strength test (JASO C444-78) after the abrasion resistance test were performed on these non-asbestos friction materials. It shows in Table 2.
【００１５】[0015]
【発明の効果】以上の様に繊維基材として石綿を含まな
い本発明非石綿系摩擦材は実施例に示した様にアラミド
繊維等の有機繊維や、ロックウール等の無機繊維、銅繊
維等の金属繊維、フェノール樹脂等の結合材及び黒鉛，
硫酸バリウム等の充填材成分とからなるもので、前記充
填材成分の少なくとも一部にチタン酸カリウム粉末を含
ませた結果、耐摩耗性及び高温時の強度が向上するので
自動車のディスクブレーキ，ドラムブレーキ，クラッチ
フェーシング等に使用する摩擦材として好適である。As described above, the non-asbestos-based friction material of the present invention containing no asbestos as a fiber base material has organic fibers such as aramid fibers, inorganic fibers such as rock wool, and copper fibers as shown in the examples. Metal fiber, binder such as phenolic resin and graphite,
It is composed of a filler component such as barium sulfate, and as a result of including potassium titanate powder in at least a part of the filler component, abrasion resistance and strength at high temperature are improved. It is suitable as a friction material used for brakes, clutch facings, etc.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【表２】 [Table 2]
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−62926（ＪＰ，Ａ) 特開 平１−294553（ＪＰ，Ａ) 特開 平４−57922（ＪＰ，Ａ) 特開 平４−290621（ＪＰ，Ａ) 特開 平４−57923（ＪＰ，Ａ) 特開 平４−73218（ＪＰ，Ａ) 特許2879364（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) C09K 3/14 F16D 69/02 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-63-62926 (JP, A) JP-A 1-294553 (JP, A) JP-A 4-57922 (JP, A) JP-A 4- 290621 (JP, A) JP 4-57923 (JP, A) JP 4-73218 (JP, A) Patent 2879364 (JP, B2) (58) Fields investigated (Int.Cl. 7 , DB name) ) C09K 3/14 F16D 69/02
Claims (3)
スペクト比８以下のチタン酸カリウムは除く）と、熱硬
化性樹脂成分と、黒鉛，硫酸バリウムを含む充填材成分
とを含有する摩擦材において、前記繊維成分中のガラス
繊維は摩擦材全量に対し15体積％未満で、かつ、前記充
填材成分にアスペクト比８以下のチタン酸カリウム粉末
を含むことを特徴とする非石綿系摩擦材。1. A friction material containing a fiber component containing organic fibers other than asbestos (excluding potassium titanate having an aspect ratio of 8 or less), a thermosetting resin component, and a filler component containing graphite and barium sulfate. In the non-asbestos friction material, the glass fiber in the fiber component is less than 15% by volume based on the total amount of the friction material, and the filler component contains potassium titanate powder having an aspect ratio of 8 or less.
粉末の含有量が摩擦材全量に対して１〜30体積％である
ことを特徴とする請求項１に記載の非石綿系摩擦材。2. The non-asbestos friction material according to claim 1, wherein the content of the potassium titanate powder having an aspect ratio of 8 or less is 1 to 30% by volume based on the total amount of the friction material.
有機繊維がアラミド繊維であり、無機繊維がガラス繊
維，ロックウール，セラミックス繊維，アスペクト比が
８より大きいチタン酸カリウム繊維のうち１種以上を含
み、金属繊維が銅，青銅，アルミニウム，黄銅のうち１
種以上を含むことを特徴とする請求項１に記載の非石綿
系摩擦材。3. A fiber component containing an organic fiber other than asbestos,
The organic fiber is an aramid fiber, the inorganic fiber includes one or more of glass fiber, rock wool, ceramic fiber, and potassium titanate fiber having an aspect ratio of more than 8, and the metal fiber is copper, bronze, aluminum, or brass. 1
The non-asbestos-based friction material according to claim 1, comprising at least one kind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11075691A JP3505190B2 (en) | 1991-04-17 | 1991-04-17 | Non-asbestos friction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11075691A JP3505190B2 (en) | 1991-04-17 | 1991-04-17 | Non-asbestos friction material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04318093A JPH04318093A (en) | 1992-11-09 |
| JP3505190B2 true JP3505190B2 (en) | 2004-03-08 |
Family
ID=14543771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11075691A Expired - Fee Related JP3505190B2 (en) | 1991-04-17 | 1991-04-17 | Non-asbestos friction material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3505190B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5962551A (en) * | 1997-01-31 | 1999-10-05 | Kubota Corporation | Powder of titanium compounds |
| JP2007277418A (en) * | 2006-04-07 | 2007-10-25 | Advics:Kk | Friction material |
| JP2020050881A (en) * | 2019-12-02 | 2020-04-02 | 日本ブレーキ工業株式会社 | Friction material composition, friction material and friction member using friction material composition |
-
1991
- 1991-04-17 JP JP11075691A patent/JP3505190B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04318093A (en) | 1992-11-09 |
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