JPH073248A - Friction material composition and production of friction material - Google Patents
Friction material composition and production of friction materialInfo
- Publication number
- JPH073248A JPH073248A JP14476293A JP14476293A JPH073248A JP H073248 A JPH073248 A JP H073248A JP 14476293 A JP14476293 A JP 14476293A JP 14476293 A JP14476293 A JP 14476293A JP H073248 A JPH073248 A JP H073248A
- Authority
- JP
- Japan
- Prior art keywords
- friction material
- friction
- material composition
- present
- composition
- 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.)
- Pending
Links
Landscapes
- Braking Arrangements (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、摩擦材組成物及び摩擦
材の製造法に関するものであり、特に自動車、鉄道車両
及び各種産業機械用のブレーキやクラッチフェーシング
材として有用な摩擦材組成物及び摩擦材の製造法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material composition and a method for producing the friction material, and particularly to a friction material composition useful as a brake or clutch facing material for automobiles, railway vehicles and various industrial machines. The present invention relates to a method for manufacturing a friction material.
【０００２】[0002]
【従来の技術】自動車、鉄道車両及び各種産業機械に
は、その制動のために摩擦材が使用されている。この摩
擦材としては、従来、アスベストの代替繊維としてスチ
ール繊維を主構成繊維としたセミメタリック系摩擦材が
主流であった。しかし、近年の自動車産業界における軽
量化、高級化の動きと共にスチール繊維の代替繊維とし
てアラミド繊維、セラミック繊維などを使用したノンス
チール摩擦材への移行が急速に進んでいる。2. Description of the Related Art Friction materials are used for braking automobiles, railway vehicles and various industrial machines. Conventionally, as the friction material, a semi-metallic friction material having steel fibers as a main constituent fiber as a substitute fiber for asbestos has been mainly used. However, in recent years, along with the trend of weight reduction and upsizing in the automobile industry, the shift to non-steel friction materials using aramid fiber, ceramic fiber or the like as a substitute fiber of steel fiber is rapidly progressing.
【０００３】しかしながら、従来の摩擦材を用いた場合
には、摩擦材の制動時の鳴きの問題があった。この鳴き
性能を向上させるための一手法として、気孔率を上げる
ことは周知の手段である。そして、気孔率を上げるため
には、摩擦材に含有される結合剤樹脂量を減少したり、
気孔形成用物質の粒径や添加量を増加したり、材料の成
形圧力を下げる等の方法が採られている。しかし、これ
らの手法ではマトリックスの強度が低下したり、摩擦係
数が低下する等の問題があった。However, when the conventional friction material is used, there is a problem of squeaking when the friction material is braked. Increasing the porosity is a well-known means as one method for improving the squealing performance. Then, in order to increase the porosity, the amount of binder resin contained in the friction material is decreased,
Methods such as increasing the particle size and the amount of addition of the substance for forming pores and lowering the molding pressure of the material have been adopted. However, these methods have problems that the strength of the matrix is lowered and the friction coefficient is lowered.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記従来技
術の問題点を解消し、摩擦材マトリックスの強度を低下
することなく気孔率を増大して鳴き性能を向上すること
ができ、高い摩擦係数を有する摩擦材を得ることができ
る摩擦材組成物及び摩擦材の製造法を提供することを目
的とするものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, can increase the porosity and improve the squealing performance without lowering the strength of the friction material matrix, and has a high friction. An object of the present invention is to provide a friction material composition capable of obtaining a friction material having a coefficient and a method for producing the friction material.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、上記課題
を解決すべく鋭意研究を重ねた結果、繊維基材、摩擦調
整剤、結合剤及び必要に応じて添加される各種添加剤を
含有する摩擦材組成物において、従来、摩擦調整剤とし
て使用されたフリクションダストの代わりに特定量のカ
ルダノール１００％ダストで置換したものを添加し、組
成物を加圧成形した後、５５０〜６００℃で１〜３分間
熱処理することによって、他の材料や成形条件は従来と
同様でも上記課題を解決しうることを見出した。本発明
は、このような知見に基づいて完成したものである。As a result of intensive studies to solve the above problems, the present inventors have found that a fiber base material, a friction modifier, a binder and various additives to be added as necessary. In the friction material composition to be contained, instead of the friction dust conventionally used as a friction modifier, what was replaced with a specific amount of 100% cardanol dust was added, and the composition was pressure-molded, then at 550 to 600 ° C. It was found that the above-mentioned problems can be solved even if other materials and molding conditions are the same as the conventional ones by heat-treating for 1-3 minutes. The present invention has been completed based on such findings.
【０００６】すなわち、本発明は、カルダノール１００
％フリクションダストを７〜２５重量％含有してなるこ
とを特徴とする摩擦材組成物に関するものである。さら
に、本発明は、上記摩擦材組成物を加圧成形し、次いで
５５０〜６００℃で熱処理することを特徴とする摩擦材
の製造法に関するものである。That is, the present invention provides cardanol 100.
% Friction dust is contained in an amount of 7 to 25% by weight. Further, the present invention relates to a method for producing a friction material, characterized in that the friction material composition is pressure-molded and then heat-treated at 550 to 600 ° C.
【０００７】摩擦材組成物は、通常、繊維基材、摩擦調
整剤、結合剤及び必要に応じて添加される各種添加剤を
含有するものであるが、本発明においては、このような
全組成物中にカルダノール１００％フリクションダスト
を７〜２５重量％含有することが必要であり、諸性能の
バランスを考慮すると１０〜２０重量％含有することが
好ましい。カルダノール１００％フリクションダストの
含有量が７重量％未満であると、鳴き性能の改善効果が
得られず、２５重量％を超えると、摩擦材の摩耗量が極
端に大きくなる。[0007] The friction material composition usually contains a fiber base material, a friction modifier, a binder and various additives which are optionally added. In the present invention, such a total composition is used. It is necessary to contain 7 to 25% by weight of cardanol 100% friction dust in the product, and it is preferable to contain 10 to 20% by weight in consideration of the balance of various performances. If the content of cardanol 100% friction dust is less than 7% by weight, the effect of improving the squeal performance cannot be obtained, and if it exceeds 25% by weight, the abrasion amount of the friction material becomes extremely large.
【０００８】本発明の摩擦材組成物において、繊維基材
としては、特に制限はなく、各種のものを使用すること
ができ、例えば、銅、黄銅等の非鉄系金属繊維、セラミ
ック繊維、ガラス繊維、炭素繊維、ウォラスナイト、人
工鉱物質繊維等の無機質繊維、ポリイミド繊維、ポリア
ミド繊維、アラミド繊維等の有機質繊維などが挙げられ
る。これらのうち１種又は２種以上を使用することがで
きる。In the friction material composition of the present invention, the fiber base material is not particularly limited, and various materials can be used, for example, non-ferrous metal fibers such as copper and brass, ceramic fibers, glass fibers. , Inorganic fibers such as carbon fibers, wollastonite and artificial mineral fibers, organic fibers such as polyimide fibers, polyamide fibers and aramid fibers. Among these, 1 type (s) or 2 or more types can be used.
【０００９】また、摩擦調整剤としては、特に制限はな
く、各種のものを使用することができ、例えば、炭酸カ
ルシウム、炭酸マグネシウム、硫酸バリウム、クレー、
タルク、黒鉛、アルミナ、マイカ、螢石、ジルコニア、
ヘマタイト、シリカ、硫化アンチモン、硫化鉄、硫化モ
リブデン等の無機物の粉末、鉄、鉛、銅等の金属の粉
末、カシューダスト、ゴムダスト、各種樹脂硬化物の粉
末等の有機物の粉末が挙げられる。これらのうち１種又
は２種以上を使用することができる。The friction modifier is not particularly limited and various ones can be used, for example, calcium carbonate, magnesium carbonate, barium sulfate, clay,
Talc, graphite, alumina, mica, fluorite, zirconia,
Inorganic powders such as hematite, silica, antimony sulfide, iron sulfide and molybdenum sulfide, metal powders such as iron, lead and copper, cashew dust, rubber dust, and powders of organic substances such as cured resin powders can be used. Among these, 1 type (s) or 2 or more types can be used.
【００１０】本発明の摩擦材組成物において、結合剤と
しては、硬化物が５５０〜６００℃での熱処理に耐える
ものであれば、特に制限はなく、各種の熱硬化性樹脂組
成物及び／又はゴムラテックスを使用することができ
る。熱硬化性樹脂組成物としては、例えばフェノール樹
脂、メラミン樹脂、尿素樹脂、ポリアミドイミド樹脂、
ポリイミド樹脂、エポキシ樹脂等の樹脂組成物が挙げら
れ、これらのうちフェノール樹脂組成物、メチル化メラ
ミン樹脂組成物が好ましい。樹脂組成物の量は、一般
に、摩擦材にしたときに固形分として１０〜５０重量％
含有させるような量が好ましい。樹脂組成物の量が少な
いと、繊維基材と摩擦調整剤に対する結合力が弱くな
り、多すぎると、摩擦材の摩擦係数及び摩耗率の調整が
困難になる。また、ゴムラテックスとしては、架橋性ゴ
ムラテックスが用いられ、例えば、ニトリルブタジエン
ゴム、アクリルゴム、天然ゴム、クロロプレンゴムなど
が挙げられる。ゴムラテックスの量としては、一般に、
得られる摩擦材中に固形分として５〜２０重量％含有さ
せるような量が好ましい。In the friction material composition of the present invention, the binder is not particularly limited as long as the cured product can withstand the heat treatment at 550 to 600 ° C., and various thermosetting resin compositions and / or Rubber latex can be used. As the thermosetting resin composition, for example, phenol resin, melamine resin, urea resin, polyamideimide resin,
Examples thereof include resin compositions such as polyimide resins and epoxy resins, and among these, phenol resin compositions and methylated melamine resin compositions are preferable. The amount of the resin composition is generally 10 to 50% by weight as a solid content when used as a friction material.
The amount contained is preferable. When the amount of the resin composition is small, the binding force between the fiber base material and the friction modifier becomes weak, and when the amount is too large, it becomes difficult to adjust the friction coefficient and wear rate of the friction material. As the rubber latex, a crosslinkable rubber latex is used, and examples thereof include nitrile butadiene rubber, acrylic rubber, natural rubber, and chloroprene rubber. As the amount of rubber latex,
The amount is preferably such that the obtained friction material has a solid content of 5 to 20% by weight.
【００１１】本発明の摩擦材組成物は、上記成分の他
に、必要に応じて各種の添加剤、例えば、分散剤、増粘
剤、可撓化剤、界面活性剤などを含有していてもよい。The friction material composition of the present invention contains, in addition to the above components, various additives such as a dispersant, a thickener, a flexibilizer, and a surfactant, if necessary. Good.
【００１２】本発明の摩擦材組成物は、上記のような各
成分を均一に混合し、乾燥し、粉砕することによって得
られる。このような摩擦材組成物を常法で加圧成形した
後、５５０〜６００℃で１〜３分間加熱することによっ
て、組成物中のカルダノール１００％ダストが揮発し、
これにより気孔率が増大した摩擦材を得ることができ
る。また、このとき発生したタール状物質が摩擦材表面
及び相手材表面に被膜を形成し、摩耗性や相手材への攻
撃性を良好にする。The friction material composition of the present invention is obtained by uniformly mixing the above components, drying and pulverizing. After press-molding such a friction material composition by a conventional method, by heating at 550 to 600 ° C. for 1 to 3 minutes, 100% of cardanol dust in the composition is volatilized,
As a result, a friction material having an increased porosity can be obtained. Further, the tar-like substance generated at this time forms a film on the surface of the friction material and the surface of the mating material, thereby improving the wear property and the attacking property to the mating material.
【００１３】次に、本発明を実施例によりさらに具体的
に説明するが、本発明はこれによって制限されるもので
はない。Next, the present invention will be described more specifically by way of examples, but the present invention is not limited thereto.
【００１４】なお、以下の実施例及び比較例で使用する
材料は、下記のとおりである。 カルダノール１００％ダスト：カシュー社製、Ｙ９３６
３ フリクションダスト：カシュー社製、Ｂ２００ フェノール樹脂：カシュー社製、Ｎｏ．２０２１ 黒鉛：日本黒鉛社製、ＣＢ１５０ 硫酸バリウム：堺化学社製、ＢＣ 研磨材：長瀬産業社製、ウォラストナイトＧ 金属繊維：日本製鋼社製、タフミックＣｕ 無機増量材：日立寒水石社製、炭酸カルシウムThe materials used in the following examples and comparative examples are as follows. Cardanol 100% dust: Y936 made by Cashew
3 Friction dust: made by Cashew, B200 Phenolic resin: made by Cashew, No. 3 2021 Graphite: Nippon Graphite Co., Ltd., CB150 Barium Sulfate: Sakai Chemical Co., BC Abrasive: Nagase Sangyo Co., Wollastonite G Metal Fiber: Nippon Steel Co., Ltd., Toughmic Cu Inorganic extender: Hitachi Suimizu Co., Ltd. Calcium carbonate
【００１５】実施例１及び２並びに比較例１及び２ 表１に示す成分を配合し、混合機で均一に混合した後、
７０℃で２時間乾燥し、その後、粉砕して摩擦材組成物
を得た。この組成物を成形粉として用いてタブレットを
形成し、次いで１８０±１０℃で圧力４．９×１０7 Ｐ
ａの条件で５分間加熱加圧成形した後、５５０℃〜６０
０で１〜３分熱処理して摩擦材パッドを得た。Examples 1 and 2 and Comparative Examples 1 and 2 The components shown in Table 1 were blended and uniformly mixed with a mixer,
It was dried at 70 ° C. for 2 hours and then pulverized to obtain a friction material composition. A tablet is formed using this composition as a molding powder, and then the pressure is 4.9 × 10 7 P at 180 ± 10 ° C.
After heat and pressure molding for 5 minutes under the condition of a, 550 ° C to 60
Heat treatment was performed for 1 to 3 minutes at 0 to obtain a friction material pad.
【００１６】得られた摩擦材パッドについてロックウェ
ル硬度及び気孔率を測定し、さらに相手材との摩擦試験
を実施し、その際の摩擦係数の変化、摩擦材パッドの摩
耗量、相手材摩耗量及び鳴きを調べ、それらの結果を表
２に示した。The Rockwell hardness and the porosity of the obtained friction material pad were measured, and a friction test with the mating material was further conducted. The change in the friction coefficient at that time, the wear amount of the friction material pad, and the mating material wear amount And squeaking were examined, and the results are shown in Table 2.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】表２に示した結果から、本発明の実施例で
作製した摩擦材は、いずれも気孔率が大きく、硬度も低
い。また、本発明の実施例で作製した摩擦材は、比較例
のものと比べると、フェード前摩擦係数において０．０
５〜０．０６、フェード最低摩擦係数において０．０
５、フェード後の摩擦係数において０．０８の差がある
ことが明らかである。さらに、本発明の実施例で作製し
た摩擦材は、パッド摩耗量で０．０５mm少なく、相手材
摩耗量で３．０μｍ大きく、鳴き性能についても優れて
いることが判る。From the results shown in Table 2, each of the friction materials produced in the examples of the present invention has a large porosity and a low hardness. Further, the friction materials produced in the examples of the present invention have a pre-fade friction coefficient of 0.0 compared with those of the comparative examples.
5 to 0.06, 0.0 at the lowest fade coefficient
5. It is clear that there is a difference of 0.08 in the friction coefficient after fading. Furthermore, it can be seen that the friction materials produced in the examples of the present invention have a pad wear amount of 0.05 mm less and a mating material wear amount of 3.0 μm greater, and are excellent in squealing performance.
【００２０】[0020]
【発明の効果】本発明の摩擦材組成物を用いれば、気孔
率が増大したことにより、鳴き性能、高速効力、フェー
ドの摩擦係数が改善された摩擦材が得られる。同時に、
カルダノール１００％ダストを５５０〜６００℃で加熱
することによって発生したタール状物質が、摩擦材表面
及び相手材表面に被膜を形成し、摩耗性や相手材への攻
撃性を良好にする。したがって、本発明の摩擦材組成物
は、自動車、鉄道車両及び各種産業機械用の摩擦材に好
適である。また、本発明によって得られる摩擦材は、高
い摩擦係数を有するとともに、摩耗量が従来品より低減
し、鳴きが著しく改善されている。By using the friction material composition of the present invention, a friction material having improved squealing performance, high-speed effect, and fade friction coefficient can be obtained by increasing the porosity. at the same time,
The tar-like substance generated by heating 100% cardanol dust at 550 to 600 ° C. forms a film on the surface of the friction material and the surface of the mating material, and improves the wear property and the aggressiveness to the mating material. Therefore, the friction material composition of the present invention is suitable for friction materials for automobiles, railway vehicles, and various industrial machines. In addition, the friction material obtained by the present invention has a high friction coefficient, the amount of wear is reduced as compared with the conventional product, and the squeaking is remarkably improved.
Claims (2)
トを７〜２５重量％含有してなることを特徴とする摩擦
材組成物。1. A friction material composition comprising 7 to 25% by weight of cardanol 100% friction dust.
し、次いで５５０〜６００℃で熱処理することを特徴と
する摩擦材の製造法。2. A method for producing a friction material, which comprises subjecting the friction material composition according to claim 1 to pressure molding and then heat treating at 550 to 600 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14476293A JPH073248A (en) | 1993-06-16 | 1993-06-16 | Friction material composition and production of friction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14476293A JPH073248A (en) | 1993-06-16 | 1993-06-16 | Friction material composition and production of friction material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH073248A true JPH073248A (en) | 1995-01-06 |
Family
ID=15369818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14476293A Pending JPH073248A (en) | 1993-06-16 | 1993-06-16 | Friction material composition and production of friction material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073248A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008069314A (en) * | 2006-09-15 | 2008-03-27 | Akebono Brake Ind Co Ltd | Method for producing friction material |
-
1993
- 1993-06-16 JP JP14476293A patent/JPH073248A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008069314A (en) * | 2006-09-15 | 2008-03-27 | Akebono Brake Ind Co Ltd | Method for producing friction material |
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