JPH09157632A - Filler for wet-type frictional material - Google Patents
Filler for wet-type frictional materialInfo
- Publication number
- JPH09157632A JPH09157632A JP34655895A JP34655895A JPH09157632A JP H09157632 A JPH09157632 A JP H09157632A JP 34655895 A JP34655895 A JP 34655895A JP 34655895 A JP34655895 A JP 34655895A JP H09157632 A JPH09157632 A JP H09157632A
- Authority
- JP
- Japan
- Prior art keywords
- rubber powder
- rubber
- wet
- filler
- nbr
- 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
- 239000000945 filler Substances 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 title abstract description 5
- 229920001971 elastomer Polymers 0.000 claims abstract description 37
- 239000005060 rubber Substances 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 31
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 19
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 17
- 229920000800 acrylic rubber Polymers 0.000 claims abstract description 5
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 5
- 239000002131 composite material Substances 0.000 claims abstract 5
- 239000011347 resin Substances 0.000 claims abstract 2
- 229920005989 resin Polymers 0.000 claims abstract 2
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract 2
- 239000002783 friction material Substances 0.000 claims description 25
- 239000000835 fiber Substances 0.000 claims description 4
- 239000003607 modifier Substances 0.000 claims description 2
- 239000002174 Styrene-butadiene Substances 0.000 abstract description 14
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 abstract description 2
- 239000007864 aqueous solution Substances 0.000 abstract description 2
- 239000000701 coagulant Substances 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 6
- 239000010718 automatic transmission oil Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 244000226021 Anacardium occidentale Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 description 1
- 229910000020 calcium bicarbonate Inorganic materials 0.000 description 1
- 235000020226 cashew nut Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、湿式クラッチ、湿式ブ
レーキ等の摩擦材に用いられる充填剤に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filler used for friction materials such as wet clutches and wet brakes.
【０００２】[0002]
【従来の技術】自動変速機に用いられる湿式摩擦材は、
概ね次の工程によって製造されている。即ち、繊維、充
填剤、摩擦調整材を水に分散し、抄紙してペーパーを作
製し、前記ペーパーを所定の形状にカットしたものに結
合剤を含浸させ、乾燥硬化後、接着剤を塗布した芯金
に、このペーパーを接着させるというものである。Wet friction materials used in automatic transmissions are
It is generally manufactured by the following steps. That is, fibers, a filler, and a friction modifier are dispersed in water, paper is made to make paper, the paper cut into a predetermined shape is impregnated with a binder, dried and cured, and then an adhesive is applied. The paper is attached to the core metal.
【０００３】繊維には、コットン等の天然パルプ繊維、
アラミド等の有機合成繊維、ガラス等の無機繊維が用い
られ、充填剤にはクレー、シリカ、グラファイト、カシ
ューダスト、ゴム粉末等が用いられる。結合剤にはフェ
ノール樹脂、変性フェノール樹脂が使用されている。The fibers include natural pulp fibers such as cotton,
Organic synthetic fibers such as aramid and inorganic fibers such as glass are used, and as the filler, clay, silica, graphite, cashew dust, rubber powder and the like are used. A phenol resin or a modified phenol resin is used as the binder.
【０００４】充填剤の中でもゴム粉末は、他の充填剤と
比較して柔軟性に富むため、摩擦係数を上げることを期
待して湿式摩擦材に用いられている。Among the fillers, rubber powder is more flexible than other fillers and is therefore used in a wet friction material in the hope of increasing the friction coefficient.
【０００５】[0005]
【発明が解決しようとする課題】しかし、一般的に用い
られるゴム粉末であるニトリルゴム（以下：ＮＢＲ）や
スチレンブタジエンゴム（以下：ＳＢＲ）は、その構造
の中に二重結合を含むため、耐熱性に劣り、特に繰り返
しの熱履歴を受けると、ゴム粉末特有の柔軟性が損なわ
れ、湿式摩擦材に柔軟性を付与し、摩擦係数を増加させ
る本来の効果が失われる。However, since nitrile rubber (hereinafter: NBR) and styrene-butadiene rubber (hereinafter: SBR), which are generally used rubber powders, contain a double bond in their structure, It is inferior in heat resistance, and when subjected to repeated thermal history, the flexibility peculiar to the rubber powder is impaired, the flexibility is imparted to the wet friction material, and the original effect of increasing the friction coefficient is lost.
【０００６】また、構造の中に二重結合を含まないゴム
として、アクリルゴム（以下：ＡＣ）があり、耐熱性に
優れたゴムとして各種分野に用いられている。しかしこ
のゴムは耐油性に劣り、自動変速機油中で使用される間
に膨潤し、湿式摩擦材の摩擦係数を極めて不安定なもの
とする。Acrylic rubber (hereinafter referred to as AC) is a rubber having no double bond in its structure and is used in various fields as a rubber having excellent heat resistance. However, this rubber has poor oil resistance and swells during use in automatic transmission fluids, making the friction coefficient of the wet friction material extremely unstable.
【０００７】本発明の目的は、耐熱性に優れ、繰り返し
の熱履歴にも経時変化を生じず、また、自動変速機油に
膨潤することによる、摩擦材からの脱落の生じないゴム
粉末を用いた摩擦材を得ることにある。The object of the present invention is to use a rubber powder which is excellent in heat resistance, does not change with time in repeated heat history, and does not fall off from the friction material due to swelling in automatic transmission oil. To get the friction material.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、前記の問
題を解決する手段として、ＡＣ、ＮＢＲ、ＳＢＲそれぞ
れの特長を利用することに着目した。そして、その方法
として、これら異種のゴムを一体化する方法を検討し
た。その結果、本発明者らは、ＡＣとＮＢＲ、ＡＣとＳ
ＢＲの一体化したゴム粉末が、耐熱性、耐油性に優れ、
これを用いた湿式摩擦材が、安定的に高い摩擦係数を発
現することを見出し、本発明をなすに至ったものであ
る。[Means for Solving the Problems] The present inventors have focused on utilizing the respective characteristics of AC, NBR and SBR as means for solving the above problems. Then, as a method thereof, a method of integrating these different kinds of rubber was examined. As a result, we have found that AC and NBR, AC and S
The rubber powder with integrated BR has excellent heat resistance and oil resistance,
The inventors have found that a wet friction material using this material stably exhibits a high friction coefficient, and have completed the present invention.
【０００８】[0008]
【作用】ＮＢＲ、ＳＢＲゴム粉末は、耐熱性が低く、繰
り返し熱履歴を受けると、ゴム本来の柔軟性を失い、こ
れを用いた湿式摩擦材は、使用回数の増加に伴い、その
摩擦係数が低下する。The NBR and SBR rubber powders have low heat resistance, and lose their original flexibility when subjected to repeated thermal history. A wet friction material using this has a friction coefficient that increases as the number of times of use increases. descend.
【０００９】前記のように、ＡＣゴム粉末は、耐油性、
特に自動変速機油への耐性が低く、これに膨潤するため
に、これを用いた湿式摩擦材の摩擦係数は、安定しな
い。As mentioned above, the AC rubber powder has oil resistance,
In particular, since the resistance to the automatic transmission oil is low and the automatic transmission oil swells, the friction coefficient of the wet friction material using the same is not stable.
【００１０】しかし、ＮＢＲとＡＣ、ＳＢＲとＡＣが一
体化されたゴム粉末では、ＡＣがＮＢＲ、ＳＢＲの構造
中の二重結合の反応による硬化を抑制し、また、ＮＢＲ
とＳＢＲの自動変速機油との親和性の低さにより、自動
変速機油が内部まで浸透し難くなるため、耐熱性にも耐
油性にも優れたゴム粉末となる。However, in the rubber powder in which NBR and AC and SBR and AC are integrated, AC suppresses the curing due to the reaction of the double bond in the structure of NBR and SBR, and also NBR.
Since the SBR has a low affinity with the automatic transmission oil, it becomes difficult for the automatic transmission oil to penetrate into the interior, so that the rubber powder has excellent heat resistance and oil resistance.
【００１１】そして、これを用いた湿式摩擦材は経時変
化が少なく、長期間の使用にも安定した高い摩擦係数を
発現する。A wet friction material using the same shows little change with time and exhibits a stable and high friction coefficient even after long-term use.
【００１２】ここで、前記の一体化ゴム粉末を製造する
方法について説明すると、それぞれのゴムのラテックス
を所要の比率で混合し、凝集剤を添加するという、比較
的簡便なものである。この際に凝集の核となる粉末状の
物質を添加してもよい。The method for producing the integrated rubber powder will be described below. It is a relatively simple method in which latexes of the respective rubbers are mixed in a required ratio and a coagulant is added. At this time, a powdery substance which becomes a nucleus of aggregation may be added.
【００１３】また、ＮＢＲまたはＳＢＲとＡＣの混合比
率は、１０〜９０重量％とするのが望ましい。その理由
は、この範囲外の混合比率では、それぞれのゴムの特長
が十分に発現できないからである。The mixing ratio of NBR or SBR and AC is preferably 10 to 90% by weight. The reason is that the characteristics of each rubber cannot be sufficiently exhibited at a mixing ratio outside this range.
【００１４】[0014]
【実施例】以下に本発明の実施例を示し、更に詳しく説
明する。EXAMPLES Examples of the present invention will be shown below and described in more detail.
【００１５】（実施例１） ＡＣとＮＢＲのラテックス
をそれぞれ５０重量部と、重炭酸カルシウム２０重量部
とを撹拌しながら、硫酸アルミニウム１０％水溶液を添
加し、ゴムを凝集造粒し、粗粉末とした。Example 1 While stirring 50 parts by weight of each of AC and NBR latex and 20 parts by weight of calcium bicarbonate, a 10% aqueous solution of aluminum sulfate was added to agglomerate and granulate rubber to obtain a coarse powder. And
【００１６】この粗粉末を１５０℃×１２時間乾燥し、
上記配合物を十分に混合した後、１５０℃で２４時間硬
化させた。この硬化物を４２５μｍの篩を通過するまで
粉砕し、ＡＣとＮＢＲが一体化したゴム粉末を得た。こ
のゴム粉末を用い、表１に示した配合で、常法に従い湿
式摩擦材を作製した。The crude powder is dried at 150 ° C. for 12 hours,
The above formulation was mixed well and then cured at 150 ° C. for 24 hours. This cured product was ground until it passed through a sieve of 425 μm to obtain a rubber powder in which AC and NBR were integrated. Using this rubber powder, a wet friction material having the composition shown in Table 1 was prepared by an ordinary method.
【００１７】（実施例２） 実施例１に於けるＮＢＲを
ＳＢＲとした他は、実施例１とまったく同様にして、Ａ
ＣとＳＢＲが一体化したゴム粉末を得た。このゴム粉末
についても、実施例１と同様にして、評価用の湿式摩擦
材を作製した。(Embodiment 2) Except for using the SBR as the NBR in the embodiment 1, the same procedure as in the embodiment 1 is carried out.
A rubber powder in which C and SBR were integrated was obtained. Also for this rubber powder, a wet friction material for evaluation was prepared in the same manner as in Example 1.
【００１８】（比較例） ＡＣ、ＮＢＲ、ＳＢＲのそれ
ぞれについて、単独で実施例１と同様にしてゴム粉末を
作製し、やはり実施例１と同様にして、評価用の湿式摩
擦材を作製した。Comparative Example A rubber powder was prepared for each of AC, NBR and SBR in the same manner as in Example 1, and a wet friction material for evaluation was prepared in the same manner as in Example 1.
【００１９】[0019]
【表１】 [Table 1]
【００２０】前記の実施例１、実施例２及び比較例で作
製した５種類の湿式摩擦材を所定形状に打ち抜き、これ
をメタノールで固形分３５％に調整されたフェノール樹
脂槽に浸漬し、８０℃×１．０時間、更に１５０℃×
２．０時間乾燥硬化させた。この摩擦材を芯金に接着
し、性能比較を行った。The five types of wet friction materials prepared in Examples 1 and 2 and Comparative Example were punched out into a predetermined shape and immersed in a phenol resin tank adjusted to a solid content of 35% with methanol, ℃ × 1.0 hours, further 150 ℃ ×
It was dried and cured for 2.0 hours. This friction material was adhered to a core metal to compare the performance.
【００２１】本発明の実施例による摩擦材と比較例によ
る摩擦材との摩擦性能について慣性吸収式摩擦試験機に
よりテストした。その結果を図１から図５に示した。The friction performance between the friction material according to the example of the present invention and the friction material according to the comparative example was tested by an inertia absorption friction tester. The results are shown in FIGS. 1 to 5.
【００２２】これらの結果から、本発明の摩擦材用充填
剤を用いた摩擦材では、従来の物よりも摩擦係数が大き
く、経時変化が極めて少ないことが明らかである。From these results, it is clear that the friction material using the filler for friction material of the present invention has a larger friction coefficient than the conventional one and has a very small change with time.
【００２３】[0023]
【発明の効果】以上に詳しく説明したように、本発明に
よるＡＣとＮＢＲ、ＡＣとＳＢＲが一体化したゴム粉末
は、耐熱性、耐油性に優れ、安定的に高い摩擦係数を発
現する効果を有する。これが摩擦材の信頼性向上に寄与
するところは非常に大きく、工業上極めて有益である。Industrial Applicability As described in detail above, the rubber powder in which AC and NBR and AC and SBR are integrated according to the present invention is excellent in heat resistance and oil resistance and has the effect of stably exhibiting a high friction coefficient. Have. The fact that this contributes to the improvement of the reliability of the friction material is very large and is extremely useful in industry.
【図１】実施例１に於ける試験サイクル数とμｓの関係
を示した図である。ここでμｓとは、完全に係合したク
ラッチを強制的に回転させた場合の最大摩擦係数であ
る。FIG. 1 is a diagram showing the relationship between the number of test cycles and μ s in Example 1. Here, μ s is the maximum friction coefficient when the completely engaged clutch is forcibly rotated.
【図２】実施例２に於ける試験サイクル数とμｓの関係
を示した図である。FIG. 2 is a diagram showing the relationship between the number of test cycles and μ s in Example 2.
【図３】比較例のＡＣゴム粉末に於ける試験サイクル数
とμｓの関係を示した図である。FIG. 3 is a diagram showing the relationship between the number of test cycles and μ s in the AC rubber powder of Comparative Example.
【図４】比較例のＮＢＲゴム粉末に於ける試験サイクル
数とμｓの関係を示した図である。FIG. 4 is a diagram showing the relationship between the number of test cycles and μ s in the NBR rubber powder of Comparative Example.
【図５】比較例のＳＢＲゴム粉末に於ける試験サイクル
数とμｓの関係を示した図である。FIG. 5 is a graph showing the relationship between the number of test cycles and μ s in the SBR rubber powder of Comparative Example.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｊ 5/14 ＣＥＱ Ｃ０８Ｊ 5/14 ＣＥＱ ＣＦＢ ＣＦＢ Ｆ１６Ｄ 13/62 Ｆ１６Ｄ 13/62 Ａ (72)発明者 西村 幹夫 東京都品川区西五反田７丁目９番４号 東 北化工株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Internal reference number FI Technical indication C08J 5/14 CEQ C08J 5/14 CEQ CFB CFB F16D 13/62 F16D 13/62 A (72) Invention Mikio Nishimura 7-9-4 Nishigotanda, Shinagawa-ku, Tokyo Tohoku Kako Co., Ltd.
Claims (2)
及びゴム粉末を主成分とする摩擦材用充填剤からなる湿
式摩擦材に於いて、該ゴム粉末がアクリルゴムとニトリ
ルゴム、またはアクリルゴムとスチレンブタジエンゴム
からなる、複合化ゴム粉末であることを特徴とする湿式
摩擦材用充填剤1. A fiber component, a thermosetting resin, a friction modifier,
And a wet friction material comprising a friction material filler containing rubber powder as a main component, wherein the rubber powder is a composite rubber powder comprising acrylic rubber and nitrile rubber, or acrylic rubber and styrene-butadiene rubber. Characteristic wet friction material filler
アクリルゴムを含有することを特徴とする、請求項１に
記載の湿式摩擦材用充填剤2. The filler for a wet friction material according to claim 1, wherein the composite rubber powder contains 10 to 90% by weight of acrylic rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34655895A JPH09157632A (en) | 1995-12-04 | 1995-12-04 | Filler for wet-type frictional material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34655895A JPH09157632A (en) | 1995-12-04 | 1995-12-04 | Filler for wet-type frictional material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09157632A true JPH09157632A (en) | 1997-06-17 |
Family
ID=18384244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34655895A Pending JPH09157632A (en) | 1995-12-04 | 1995-12-04 | Filler for wet-type frictional material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09157632A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6596789B2 (en) * | 1998-08-26 | 2003-07-22 | Nisshinbo Industries, Inc. | Non-asbestos friction materials |
-
1995
- 1995-12-04 JP JP34655895A patent/JPH09157632A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6596789B2 (en) * | 1998-08-26 | 2003-07-22 | Nisshinbo Industries, Inc. | Non-asbestos friction materials |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4256801A (en) | Carbon fiber/flame-resistant organic fiber sheet as a friction material | |
| JP3535579B2 (en) | Unsaturated friction material containing powdered silicone resin and powdered phenolic resin and method for producing the same | |
| JPH0276935A (en) | Friction material | |
| US4320823A (en) | Friction members formed from compositions containing aramid fibers and an aqueous heat-hardenable cement comprising a water soluble phenolic resin and a heat-curable elastomer | |
| KR950006122A (en) | Friction material comprising powdered phenolic resin and method for preparing same | |
| US20050039872A1 (en) | High torque capacity wet paper friction member | |
| CN101835867A (en) | Wet friction material | |
| US3307969A (en) | Friction material | |
| JP2822512B2 (en) | Friction material composition | |
| JP2009062514A (en) | Wet friction material | |
| US8431629B2 (en) | Wet friction material including an inorganic filler | |
| JPH09132769A (en) | Filler for fraction material | |
| JPS6051773A (en) | Particulate friction adjustor | |
| JPH06129455A (en) | Nonasbestine friction matrial | |
| JP3865265B2 (en) | Friction material | |
| RU2009149C1 (en) | Composition for asbestosless friction materials | |
| JP2009263449A (en) | Wet friction material | |
| JP2879382B2 (en) | Friction material without fiber component | |
| JP2963605B2 (en) | Friction material | |
| JPH0643502B2 (en) | Friction material | |
| JPH0310815B2 (en) | ||
| JPH05247444A (en) | Nonasbestos friction material | |
| JPH0987613A (en) | Filler for friction material and its production | |
| JPH11210791A (en) | Wet friction material | |
| JP2858968B2 (en) | Non-asbestos friction material |