JPH08145098A - Brake friction material - Google Patents

Brake friction material

Info

Publication number
JPH08145098A
JPH08145098A JP28563894A JP28563894A JPH08145098A JP H08145098 A JPH08145098 A JP H08145098A JP 28563894 A JP28563894 A JP 28563894A JP 28563894 A JP28563894 A JP 28563894A JP H08145098 A JPH08145098 A JP H08145098A
Authority
JP
Japan
Prior art keywords
friction material
resin
added
brake friction
brake
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.)
Withdrawn
Application number
JP28563894A
Other languages
Japanese (ja)
Inventor
Shingo Miyake
信吾 三宅
Toshio Kobayashi
俊生 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokico Ltd
Original Assignee
Tokico Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokico Ltd filed Critical Tokico Ltd
Priority to JP28563894A priority Critical patent/JPH08145098A/en
Publication of JPH08145098A publication Critical patent/JPH08145098A/en
Withdrawn legal-status Critical Current

Links

Abstract

PURPOSE: To improve heat resistance by using thermosetting resin having specified thermal cracking beginning speed and residual ash factor in nitrogen atmosphere for binding material, and specifying the pH of a braking friction material itself. CONSTITUTION: Binding material is combined with components including base material at the beginning, and thermosetting resin having thermal cracking beginning temperature being higher higher than 250 deg.C and residual ash factor in nitrogen atmosphere being more than 60% is used as binding material, and the pH of braking friction material itself shall be more than 8. Copper fiber, ceramic fiber and aramid fiber are added as base material, and graphite and antimony trisulfide are added as lubricating material, and barium sulfate and calcium hydroxide are added as bulking agent, and further copnaresin having introduced phenol nucleus is added as friction adjusting material and the binding material, and resin having added hexamine is used as hardening agent. Thus, the brake friction material being excellent in heat resistance can be manufactured.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はブレーキに用いられる摩
擦材に係り、特に自動車等のブレーキパッドに用いて好
適なノンアスベスト系のブレーキ摩擦材に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material used for a brake, and more particularly to a non-asbestos type brake friction material suitable for a brake pad of an automobile or the like.

【0002】[0002]

【従来の技術】自動車等のブレーキパッドに用いられる
ノンアスベスト系ブレーキ用摩擦材は、例えば、スチー
ル、銅等の金属繊維、セラミック、カーボンファイバ等
の無機繊維、アラミド繊維等の強化繊維等からなる基材
に、黒鉛、三硫化アンチモン、二硫化モリブデン等の潤
滑材、硫酸バリウム、水酸化カルシウム等の充填材、お
よびカシューダスト、セラミック粉、金属粉末等の摩擦
調整材を配合し、かつこれらの成分に結合材を配合して
十分攪拌混合後、加熱しつつ圧縮成形を行うことにより
作製されている。また、上記結合材としては、例えばフ
ェノール樹脂等が使用される。
2. Description of the Related Art Non-asbestos type friction materials for brakes used in brake pads of automobiles are made of, for example, metal fibers such as steel and copper, ceramics, inorganic fibers such as carbon fibers, and reinforced fibers such as aramid fibers. Lubricants such as graphite, antimony trisulfide and molybdenum disulfide, fillers such as barium sulfate and calcium hydroxide, and friction modifiers such as cashew dust, ceramic powder and metal powder are blended with the base material, and It is produced by blending the components with a binder, thoroughly stirring and mixing, and then performing compression molding while heating. Further, as the binder, for example, phenol resin or the like is used.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記従
来のブレーキ摩擦材のうち、結合材としてフェノール樹
脂を使用したものは、250〜300℃付近から熱分解
ガスを発生し、フェード現象のような高温下における摩
擦計数μの低下を引き起こすという問題がある。
However, among the above-mentioned conventional brake friction materials, those using a phenol resin as a binding material generate a thermal decomposition gas from around 250 to 300 ° C. and generate a high temperature such as a fade phenomenon. There is a problem of causing a decrease in the friction coefficient μ below.

【0004】そこで、本発明者らは、上記ブレーキ摩擦
材の耐熱性等を始めとする諸特性を向上させる目的で、
先に、特願昭62−9556号、あるいは特願昭63−
97410号において、結合材として、例えば縮合多環
芳香族炭化水素からなる樹脂(以下、コプナ樹脂と略称
する。)、あるいはピッチ系コプナ樹脂を使用したもの
を考案した。ちなみに、コプナ樹脂は、熱分解開始速度
が250℃以上、かつ窒素雰囲気中における残灰率が6
0%以上という、優れた耐熱性を有している。
Therefore, the present inventors have aimed to improve various characteristics such as heat resistance of the above-mentioned brake friction material,
First, Japanese Patent Application No. 62-9556 or Japanese Patent Application No. 63-
No. 97410, a resin using a condensed polycyclic aromatic hydrocarbon (hereinafter, abbreviated as "copna resin") or a pitch-based coplanar resin was devised as a binder. By the way, Copna resin has a thermal decomposition initiation rate of 250 ° C or higher and a residual ash ratio of 6 in a nitrogen atmosphere.
It has excellent heat resistance of 0% or more.

【0005】しかしながら、結合材としてコプナ樹脂や
ピッチ系コプナ樹脂を使用したものは、硬化反応に酸触
媒が必要なため、ブレーキ摩擦材をアルカリ性とするこ
とが困難で、その結果、ブレーキ摩擦材と接触するブレ
ーキ部品における錆の発生原因となるという問題があ
る。
However, in the case of using the coplanar resin or the pitch type coplanar resin as the binder, it is difficult to make the brake friction material alkaline because the acid catalyst is required for the curing reaction, and as a result, the brake friction material There is a problem that it causes rust in the brake parts that come into contact.

【0006】また、異音の防止を目的にスチール繊維を
配合しないブレーキ摩擦材のうち、フェノール樹脂を結
合材に使用したものでは、特に300℃付近の高温にお
ける接着強度の低下が問題となっている。
Further, among the brake friction materials containing no steel fiber for the purpose of preventing abnormal noise, those using a phenol resin as a binder material have a problem that the adhesive strength is lowered particularly at a high temperature of about 300 ° C. There is.

【0007】[0007]

【課題を解決するための手段】本発明は、上記問題を解
決するためになされたもので、基材を始めとする成分に
結合材を配合して得られるブレーキ摩擦材において、上
記結合材に、熱分解開始速度が250℃以上で、窒素雰
囲気中における残灰率が60%以上である熱硬化性樹脂
を用い、かつ上記ブレーキ用摩擦材自身のpHが8以上
であることを特徴とするものである。
DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and in a brake friction material obtained by blending a component such as a base material with a binder, A thermosetting resin having a thermal decomposition initiation rate of 250 ° C. or higher and a residual ash ratio of 60% or higher in a nitrogen atmosphere, and having the pH of the brake friction material itself of 8 or higher. It is a thing.

【0008】この場合、本発明者らは、特に結合材とし
てのコプナ樹脂の特性と、その硬化反応とに着目し、コ
プナ樹脂にフェノール核を導入することにより、ヘキサ
ミンによる熱硬化を可能とした。すなわち、コプナ樹脂
にフェノール核を導入し、コプナ樹脂の硬化反応をフェ
ノール樹脂と同様の硬化反応に変化させることにより、
上記条件を満たす熱硬化性樹脂を得るに至った。
In this case, the present inventors have paid special attention to the characteristics of the copuna resin as a binder and its curing reaction, and by introducing a phenol nucleus into the copuna resin, the thermosetting with hexamine is possible. . That is, by introducing a phenol nucleus into the Copuna resin and changing the curing reaction of the Copuna resin into a curing reaction similar to that of the phenol resin,
A thermosetting resin satisfying the above conditions has been obtained.

【0009】[0009]

【作用】本発明によれば、耐熱性は上記従来のコプナ樹
脂と同等で、かつアルカリ性でも硬化可能な結合材が得
られる。
According to the present invention, a binder having a heat resistance equivalent to that of the above-mentioned conventional COPNA resin and being curable even in alkaline can be obtained.

【0010】[0010]

【実施例】以下、図面に基づき、本発明の実施例につい
て説明する。 (1)基材として銅繊維、セラミック繊維、アラミッド
繊維を用い、潤滑材として黒鉛、三硫化アンチモン、充
填材として硫酸バリウム、水酸化カルシウムをそれぞれ
添加し、更に、フェノール核が導入された例えば図1に
示すような構造を有するコプナ樹脂を摩擦調整材および
結合材としてそれぞれ加し、かつ硬化剤としてヘキサミ
ンを添加した樹脂を用意した。
Embodiments of the present invention will be described below with reference to the drawings. (1) Copper fiber, ceramic fiber, or aramid fiber is used as a base material, graphite, antimony trisulfide is added as a lubricant, barium sulfate or calcium hydroxide is added as a filler, and a phenol nucleus is further introduced. A resin was prepared by adding a coplanar resin having a structure as shown in 1 as a friction modifier and a binder and adding hexamine as a curing agent.

【0011】(2)次いで、上記材料を図2中実施例
の欄に示すような比率で配合し、レーディゲミキサを用
い充分に混合撹拌した後、室温にて圧力500kgf/cm2
で予備成形した。
(2) Next, the above materials were blended in a ratio as shown in the column of Example in FIG. 2, thoroughly mixed and stirred using a Rödege mixer, and then a pressure of 500 kgf / cm 2 at room temperature.
It was preformed with.

【0012】この予備成形品を、所定の金型を用い、1
75℃,400kgf/cm2,4分の条件で加熱圧縮成形
後、常圧にて200℃,5時間の熱処理を行い、ブレー
キ摩擦材(実施例)を得た。
This preformed product is used in a predetermined mold to
After heat compression molding under the conditions of 75 ° C., 400 kgf / cm 2 and 4 minutes, heat treatment was carried out at normal pressure at 200 ° C. for 5 hours to obtain a brake friction material (Example).

【0013】一方、比較例として、結合材として例えば
図3に示すような構造を有するフェノール樹脂を使用し
た比較例、フェノール核が導入されないコプナ樹脂を
結合材に用いた比較例、結合材にフェノール樹脂を使
用し、かつ繊維材の一部にスチール繊維を使用した比較
例をそれぞれ図2に示すような比率で配合し、更に実
施例と同様の手順でブレーキ摩擦材を作製した。
On the other hand, as comparative examples, a comparative example using a phenol resin having a structure as shown in FIG. 3 as a binder, a comparative example using a copuna resin in which a phenol nucleus is not introduced as a binder, and a phenol binder Comparative examples in which a resin was used and steel fibers were used as a part of the fiber material were mixed at the ratios shown in FIG. 2, and a brake friction material was produced in the same procedure as in the example.

【0014】そして、上記のように作製した各ブレーキ
摩擦材の接着強度を、「社団法人自動車技術会規格C−
444」に従って試験し、また摩擦特性を「同試験法C
−406」に従って試験した。また、ブレーキ摩擦材の
pHは、粉砕したブレーキ摩擦材を300℃にて1時間
熱処理したもの10gを水100cm3に入れて2日間放
置した後、30分煮沸し、更に室温まで冷却してから、
ガラス電極製pHメータにて測定した。これらの結果を
図4に示す。
Then, the adhesive strength of each brake friction material produced as described above is determined according to the "Japan Society of Automotive Engineers Standard C-
444 ", and the frictional properties are determined by" Test Method C "
-406 ". Regarding the pH of the brake friction material, 10 g of crushed brake friction material heat-treated at 300 ° C. for 1 hour was put in 100 cm 3 of water, left for 2 days, boiled for 30 minutes, and further cooled to room temperature. ,
It measured with the pH meter made from a glass electrode. The results are shown in FIG.

【0015】試験の結果、実施例のブレーキ摩擦材は
(非鉄繊維材を用いても)、高温(300℃)下におい
ても接着強度の低下がなく充分な強度を確保しており、
摩擦特性も安定している。更に、pHも11.5とアル
カリ性を示しており、ブレーキの裏金の接着面やディス
クロータへの防錆効果も高い。
As a result of the test, the brake friction material of the example (even if the non-ferrous fiber material is used) has sufficient adhesive strength without deterioration of the adhesive strength even at high temperature (300 ° C.),
Friction characteristics are also stable. Furthermore, the pH is 11.5, which is alkaline, and the effect of rust prevention on the adhesive surface of the back metal of the brake and the disc rotor is high.

【0016】更に、図4の結果から、実施例のブレー
キ摩擦材に使用した、フェノール樹脂が導入されたコプ
ナ樹脂の熱分解開始速度が250℃以上であることは明
白である。また、更なる研究の結果、実施例のブレー
キ摩擦材に結合材として使用したコプナ樹脂の、窒素雰
囲気中における残灰率は60%以上であった。すなわ
ち、このコプナ樹脂は、上記従来のコプナ樹脂と同等、
優れた耐熱性を有している。
Further, from the results shown in FIG. 4, it is clear that the thermal decomposition initiation rate of the Copuna resin containing the phenolic resin used in the brake friction material of the example is 250 ° C. or higher. Further, as a result of further studies, the residual ash ratio in the nitrogen atmosphere of the Copna resin used as the binder in the brake friction material of the example was 60% or more. That is, this Copuna resin is equivalent to the above-mentioned conventional Copuna resin,
Has excellent heat resistance.

【0017】これに対し、比較例のブレーキ摩擦材は
高温での強度が低下し、フェード現象により摩擦係数μ
も低下している。
On the other hand, the brake friction material of the comparative example has a reduced strength at high temperature and the friction coefficient μ due to the fade phenomenon.
Is also declining.

【0018】また、比較例のブレーキ摩擦材は、強
度、摩擦特性は実施例と同等であるが、pHが6.5
と酸性を示しており、上記裏金の接着面における発錆の
防止効果がない。
The brake friction material of the comparative example has the same strength and friction characteristics as those of the example, but has a pH of 6.5.
And shows acidity, and there is no effect of preventing rusting on the adhesive surface of the back metal.

【0019】一方、比較例のブレーキ摩擦材は、スチ
ール繊維の存在により、比較例より高温での強度低下
は少ないが、フェード現象により摩擦係数μが低下して
いる。
On the other hand, the brake friction material of the comparative example has less strength decrease at high temperature than the comparative example due to the presence of the steel fiber, but the friction coefficient μ is decreased due to the fade phenomenon.

【0020】[0020]

【発明の効果】本発明によれば、耐熱性に優れたブレー
キ摩擦材をpH8以上で作製できる。そのため、 (1)基材を非鉄繊維材料としても強度を確保でき、か
つスチール繊維の使用に伴うるロータの肉厚変動を防止
できる。 (2)長期にわたる発錆を防止しながら、安定的な摩擦
係数を維持できる。という優れた効果が得られる。
According to the present invention, a brake friction material having excellent heat resistance can be produced at a pH of 8 or higher. Therefore, (1) the strength can be ensured even when the base material is a non-ferrous fiber material, and fluctuations in the wall thickness of the rotor due to the use of steel fibers can be prevented. (2) A stable friction coefficient can be maintained while preventing rusting for a long period of time. That is an excellent effect.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明のブレーキ摩擦材に結合材として使用さ
れる、フェノールが導入されたコプナ樹脂の構造の例を
示す構造式である。
FIG. 1 is a structural formula showing an example of a structure of a phenol-incorporated coplanar resin used as a binder in the brake friction material of the present invention.

【図2】本発明の一実施例および比較例のブレーキ摩擦
材の組成を示す表である。
FIG. 2 is a table showing compositions of brake friction materials of one example and a comparative example of the present invention.

【図3】従来のブレーキ摩擦材に結合材として使用され
るフェノール樹脂の構造の例を示す構造式である。
FIG. 3 is a structural formula showing an example of a structure of a phenol resin used as a binder in a conventional brake friction material.

【図4】本発明の一実施例および比較例のブレーキ摩擦
材に対する試験結果を示す表である。
FIG. 4 is a table showing test results for brake friction materials of one example and a comparative example of the present invention.

【符号の説明】[Explanation of symbols]

なし None

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 基材を始めとする成分に結合材を配合し
て得られるブレーキ摩擦材において、 上記結合材に、熱分解開始速度が250℃以上で、窒素
雰囲気中における残灰率が60%以上である熱硬化性樹
脂を用い、かつ上記ブレーキ用摩擦材自身のpHが8以
上であることを特徴とするブレーキ摩擦材。
1. A brake friction material obtained by incorporating a binder into a component including a base material, wherein the binder has a thermal decomposition initiation rate of 250 ° C. or higher and a residual ash ratio in a nitrogen atmosphere of 60. % Of the thermosetting resin, and the pH of the brake friction material itself is 8 or more.
【請求項2】 上記熱硬化性樹脂が、縮合多環芳香族炭
化水素からなる樹脂にフェノール核が導入され、かつヘ
キサミンにより熱硬化される樹脂であることを特徴とす
る請求項1記載のブレーキ摩擦材。
2. The brake according to claim 1, wherein the thermosetting resin is a resin comprising a condensed polycyclic aromatic hydrocarbon in which a phenol nucleus is introduced and which is thermoset by hexamine. Friction material.
【請求項3】 上記基材が、非鉄繊維材料であることを
特徴とする請求項1または2記載のブレーキ摩擦材。
3. The brake friction material according to claim 1, wherein the base material is a non-ferrous fiber material.
JP28563894A 1994-11-18 1994-11-18 Brake friction material Withdrawn JPH08145098A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28563894A JPH08145098A (en) 1994-11-18 1994-11-18 Brake friction material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28563894A JPH08145098A (en) 1994-11-18 1994-11-18 Brake friction material

Publications (1)

Publication Number Publication Date
JPH08145098A true JPH08145098A (en) 1996-06-04

Family

ID=17694129

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28563894A Withdrawn JPH08145098A (en) 1994-11-18 1994-11-18 Brake friction material

Country Status (1)

Country Link
JP (1) JPH08145098A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2006330A2 (en) 2007-06-22 2008-12-24 Akebono Brake Industry CO., LTD. Thermosetting resin material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2006330A2 (en) 2007-06-22 2008-12-24 Akebono Brake Industry CO., LTD. Thermosetting resin material
EP2006330A3 (en) * 2007-06-22 2009-06-03 Akebono Brake Industry CO., LTD. Thermosetting resin material
US7687570B2 (en) 2007-06-22 2010-03-30 Akebono Brake Industry Co., Ltd. Thermosetting resin material

Similar Documents

Publication Publication Date Title
US5670231A (en) Clutch facing
US5344854A (en) Friction material for brake
JP2003313312A (en) Non-asbestos friction material
US4954536A (en) Brake-friction material
JP2000144104A (en) Friction material
JP2806499B2 (en) Friction material
US6080230A (en) Friction material composition
JPH08145098A (en) Brake friction material
US5411773A (en) Friction material
JPH10330732A (en) Friction material composition and friction material made therefrom
JPH04106183A (en) Non-asbestos friction material
JP2661704B2 (en) Brake friction material
JP2827136B2 (en) Non-asbestos friction material
JP2710366B2 (en) Brake friction material
JPH05320373A (en) Resin composition for frictional material
JP3392255B2 (en) Brake friction material
JP2000026839A (en) Friction material composition, production of same, and friction material made from same
JP3865265B2 (en) Friction material
JPH05320372A (en) Resin composition for frictional material
JPH08254236A (en) Brake frictional material
JPH10130627A (en) Friction material composition and production of friction material therefrom
JPH0931213A (en) Frictional material
JPH04151036A (en) Brake frictional member
JPH0625650A (en) Friction material
JPH10330731A (en) Friction material

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20020205