JPH073256B2 - Cash-dust and its manufacturing method - Google Patents
Cash-dust and its manufacturing methodInfo
- Publication number
- JPH073256B2 JPH073256B2 JP9174586A JP9174586A JPH073256B2 JP H073256 B2 JPH073256 B2 JP H073256B2 JP 9174586 A JP9174586 A JP 9174586A JP 9174586 A JP9174586 A JP 9174586A JP H073256 B2 JPH073256 B2 JP H073256B2
- Authority
- JP
- Japan
- Prior art keywords
- friction
- dust
- cashew dust
- cashew
- friction material
- 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 - Lifetime
Links
- 239000000428 dust Substances 0.000 title claims description 25
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 244000226021 Anacardium occidentale Species 0.000 claims description 30
- 235000020226 cashew nut Nutrition 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 5
- 230000006378 damage Effects 0.000 claims description 4
- 239000004088 foaming agent Substances 0.000 claims description 4
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 3
- 239000002954 polymerization reaction product Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 239000002783 friction material Substances 0.000 description 26
- 230000002159 abnormal effect Effects 0.000 description 7
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 6
- 239000010425 asbestos Substances 0.000 description 5
- 229910052895 riebeckite Inorganic materials 0.000 description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 4
- 238000001723 curing Methods 0.000 description 4
- 239000003607 modifier Substances 0.000 description 4
- 229920001568 phenolic resin Polymers 0.000 description 4
- 239000005011 phenolic resin Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 1
- 239000004312 hexamethylene tetramine Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Landscapes
- Braking Arrangements (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はブレーキシューなどの摩擦材中に添加するカシ
ューダストと、その製造方法に関する。TECHNICAL FIELD The present invention relates to cashew dust to be added to a friction material such as a brake shoe and a method for producing the same.
ブレーキシュー、ブレーキパッド、制輪子などに用いる
摩擦材は従来より石綿、石綿糸の如き繊維物質にフェノ
ール樹脂や合成ゴムなどの結合剤と、摩擦改良剤とを添
加して加熱硬化せしめることにより製造されていた。Conventionally, friction materials used for brake shoes, brake pads, brake shoes, etc. are manufactured by adding a binder such as phenolic resin or synthetic rubber and a friction modifier to a fibrous substance such as asbestos or asbestos thread, and heating and curing. It had been.
摩擦材として要求される性能は、機械的強度を有するこ
とのほか、例えば摩擦係数が適当で、温度変化に対して
も安定であること、摩擦が少ないこと、被摩擦面を損傷
させないこと、作用時に異音を発しないこと等である。In addition to having mechanical strength, the performance required as a friction material is, for example, that the coefficient of friction is appropriate, that it is stable against temperature changes, that there is little friction, that it does not damage the surface to be rubbed, Sometimes it does not make noise.
これらの性能は主として摩擦材中に含まれる配合成分の
種類と添加量とによって決定される。当然ながら摩擦改
良剤は、摩擦材の摩擦性能に大きな影響を与える要素で
ある。例えば石綿とフェノール樹脂のみからなる摩擦材
は作用時の摩耗がはげしく、しかも摩擦係数の変化が大
きいために実用に供し難いが、この二成分に、硫酸バリ
ウム、カシューダスト等の摩擦改良剤を添加配合せしめ
ることにより、摩擦材の耐摩耗性と摩擦係数の安定性を
著しく向上できる。特にカシューダストの使用によるそ
の効果は顕著である。このために高性能を要求される摩
擦材には、摩擦改良剤としてカシューダストが用いられ
ているのは周知のとおりである。These performances are mainly determined by the type and addition amount of the compounding ingredients contained in the friction material. Of course, the friction modifier is an element that greatly affects the friction performance of the friction material. For example, a friction material consisting only of asbestos and phenolic resin is hard to put into practical use due to its high wear during operation and the large change in friction coefficient, but a friction modifier such as barium sulfate or cashew dust is added to these two components. By blending them, the wear resistance of the friction material and the stability of the friction coefficient can be remarkably improved. Especially, the effect of using cashew dust is remarkable. For this reason, it is well known that cashew dust is used as a friction modifier in friction materials that require high performance.
しかしながら、カシューダストはフェノール樹脂、硫酸
バリウムなどに比べて粒子が粗く、摩擦材の組織中に混
入した場合に脱落分離して組織の均一化を図ることがむ
ずかしい。However, cashew dust has coarser particles than those of phenolic resin, barium sulfate, etc., and when mixed in the structure of the friction material, it is difficult to separate and separate the structure to make the structure uniform.
また、カシューダストは摩擦材の性能として要求される
耐摩耗性と摩擦係数の安定性改善には有効ではあるが、
摩擦作用時の異音の発生を抑制するという点についての
効果はあまり期待できないという欠点がある。Also, cashew dust is effective in improving the wear resistance and the stability of the friction coefficient required for the performance of friction materials,
There is a drawback in that the effect of suppressing the generation of abnormal noise during frictional action cannot be expected so much.
本発明の目的は摩擦材の組織中に均一に分散させ、しか
も作用時の異音発生防止に有効なカシューダストと、そ
の製造方法を提供することにある。It is an object of the present invention to provide cashew dust which is uniformly dispersed in the structure of the friction material and which is effective in preventing abnormal noise during operation, and a method for producing the same.
本発明はカシューナット殻液の重合反応物を含む発泡体
組織からなり、表面に発泡体組織の気泡の破壊によって
形成された不定形の突縁を有することを特徴とするカシ
ューダストおよび、このカシューダストを得る方法すな
わち、 重合させたカシューナット殻液に発泡剤を加えてアルデ
ヒド類と反応硬化させ、得られた発泡固形物を粉砕する
ことを特徴とするカシューダストの製造方法である。The present invention is composed of a foam structure containing a polymerization reaction product of cashew nut shell liquid, and has cashew dust characterized by having an irregular edge formed on the surface by destruction of bubbles of the foam structure, and the cashew dust. A method for obtaining dust, that is, a method for producing cashew dust, characterized by adding a foaming agent to polymerized cashew nut shell liquid, reacting and curing with an aldehyde, and crushing the obtained foamed solid matter.
カシューナット殻液の重合反応物を含む発泡体組織の粉
砕物はその表面に気泡の破壊による鋭利な不定形の突縁
が多数形成され、この突縁が摩擦材組織の石綿繊維に引
掛って脱落分離が抑えられ、また摩擦材組織中への発泡
体混入により組織の気孔率が増す。The crushed product of the foamed tissue containing the polymerization reaction product of cashew nut shell liquid has many sharp and irregular edges formed on the surface due to the destruction of bubbles, and these edges are caught on the asbestos fibers of the friction material structure. Fall-off separation is suppressed, and the porosity of the structure is increased due to the inclusion of foam in the structure of the friction material.
一般にノンポーラスな摩擦材ほど摩擦作用時に異音を発
しやすい傾向にあることが知られている（柿原健治氏ほ
かの報告；トヨタ技術,25（２）,166（1975））。It is generally known that non-porous friction materials tend to generate abnormal noise during frictional action (Kenji Kakihara et al. Report; Toyota Technology, 25 (2), 166 (1975)).
カシューナット殻液の重合体をアルデヒド類と反応硬化
させ、これを粉砕して得られた従来のカシューダストの
密度は1.04〜1.25g/cm2の範囲内である。これに対し、
本発明のカシューダストの密度は0.50g/cm3以下とな
る。したがって、各々のカシューダストを用いて同一条
件で摩擦材を製造する場合に、本発明のカシューダスト
は重量比で従来のカシューダストの半分以下を配合すれ
ばよい。本発明のカシューダストの添加によって摩擦材
組織の気孔率が高まり、摩擦作用時の異音の発生が防止
される。The density of conventional cashew dust obtained by reacting and curing the polymer of cashew nut shell liquid with aldehydes and crushing this is in the range of 1.04 to 1.25 g / cm 2 . In contrast,
The cashew dust of the present invention has a density of 0.50 g / cm 3 or less. Therefore, when the friction material is manufactured under the same conditions by using each cashew dust, the cashew dust of the present invention may be mixed in a weight ratio of half or less of the conventional cashew dust. By adding cashew dust of the present invention, the porosity of the structure of the friction material is increased, and the generation of abnormal noise during friction action is prevented.
以下に本発明の実施例を示す。 Examples of the present invention will be shown below.
（１）カシューダストの製造 カシューナット殻液100部を反応缶中に投入し、240℃〜
260℃の温度条件の下で12時間重合反応をさせた後、40
℃以下に冷却し、その反応液に界面活性剤（東レ（株）
製，トーレシリコーンSH193）１部、発泡剤（三共化成
（株）製，セルマイクＨ）５部を添加、混合した。次い
でその混合液をニーダに移してヘキサメチレンテトラミ
ン10部を加えて十分に混合した。この混合液をバットに
薄くとり、80℃で８時間、150〜165℃で10時間加熱処理
して反応硬化させ、冷却後粉砕して40メッシュ以下の細
かい粒度のカシューダストを得た。(1) Manufacture of cashew dust 100 parts of cashew nut shell liquid is charged into a reaction vessel, and the temperature is 240 ° C
After the polymerization reaction for 12 hours under the temperature condition of 260 ℃, 40
Cool to below ℃, and add a surfactant (Toray Industries, Inc.) to the reaction solution.
Toray Silicone SH193) (1 part) and a foaming agent (Sankyo Kasei Co., Ltd., SELMIC H) (5 parts) were added and mixed. Then, the mixed solution was transferred to a kneader, and 10 parts of hexamethylenetetramine was added and mixed well. This mixed solution was thinly placed in a vat, heat-treated at 80 ° C. for 8 hours and at 150 to 165 ° C. for 10 hours for reaction curing, cooled and pulverized to obtain cashew dust having a fine particle size of 40 mesh or less.
（２）摩擦材の製造 前記（１）の処理によって得られたカシューダストを用
い、常法にしたがって摩擦材を製造した。あわせて比較
のため、界面活性剤および発泡剤を添加しないで前記
（１）の同様の処理により得られた従来のカシュタース
トを用いて摩擦材を製造した。材料の配合並びに製造条
件は以下のとおりである。すなわち、 ６クラス石綿短繊維 31.2cc フェノール樹脂 （東北化工（株）製PB−1280） 18.8cc カシューダスト 19.8cc 硫酸バリウム 3.3cc 上記配合物を混合した後、熱プレスを用いて150℃の下
で200kg/cm2に加圧し、10分間加熱硬化させ、次いで180
℃で４時間熱処理して板状の摩擦材（255×5.7×5mm）
を得た。(2) Manufacture of friction material Using the cashew dust obtained by the treatment of (1), a friction material was manufactured according to a conventional method. In addition, for comparison, a friction material was manufactured using the conventional Kastast obtained by the same treatment as the above (1) without adding a surfactant and a foaming agent. The composition of the materials and the manufacturing conditions are as follows. That is, 6 class asbestos short fiber 31.2cc phenolic resin (PB-1280 manufactured by Tohoku Kako Co., Ltd.) 18.8cc cashew dust 19.8cc barium sulfate 3.3cc After mixing the above-mentioned compounds, at 150 ° C using a hot press. Pressurize to 200kg / cm 2 , heat cure for 10 minutes, then 180
Plate-shaped friction material (255 x 5.7 x 5 mm) after heat treatment at ℃ for 4 hours
Got
（３）評価 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JIS D−4411に準拠して比較した結
果を第１図（ａ），（ｂ）に示す。第１図（ａ），
（ｂ）に明らかなとおり、本発明によれば摩擦材組織中
でのカシューダストの分散性改善により温度変化に対す
る摩擦係数の変動が少なく、高温下での摩耗率が著しく
改善された。(3) Evaluation The results of comparison of friction performance between the friction material according to the example of the present invention and the friction material according to the comparative example based on JIS D-4411 are shown in FIGS. 1 (a) and 1 (b). Figure 1 (a),
As is apparent from (b), according to the present invention, the dispersibility of cashew dust in the structure of the friction material was improved, and thus the variation of the friction coefficient with respect to the temperature change was small, and the wear rate at high temperature was significantly improved.
また、JIS定速式摩擦試験機により40分間連続して摩擦
した場合の摩擦特性と異音発生の有無を比較した結果を
第２図（ａ），（ｂ）に示す。摩擦時間に対する摩擦温
度の変化は実施例と、比較例に殆ど差はないが、本発明
によれば摩擦係数の変動が少なく、異音はわずかに発生
したのみであった。なお、実施例と比較例とによる摩擦
材の特性を第１表に示す。The results of comparing the frictional characteristics and the presence or absence of abnormal noise when continuously rubbed by the JIS constant speed friction tester for 40 minutes are shown in FIGS. 2 (a) and 2 (b). Although there is almost no difference in the change of the friction temperature with respect to the friction time between the example and the comparative example, according to the present invention, the variation of the friction coefficient is small, and the abnormal noise is slightly generated. Table 1 shows the characteristics of the friction materials according to the example and the comparative example.
〔発明の効果〕 以上のように本発明によるときには発泡組織の特徴を有
効に生かして摩擦材を構成する繊維組織中に均一に分散
させて耐摩耗性並びに摩擦係数の安定性向上を図り、あ
わせて組織中の気孔率を上げて摩擦作用時の異音の発生
を抑制できる効果を有するものである。 [Advantages of the Invention] As described above, according to the present invention, the characteristics of the foamed structure are effectively used to uniformly disperse in the fiber structure constituting the friction material to improve wear resistance and stability of the friction coefficient. It has the effect of increasing the porosity in the tissue and suppressing the generation of abnormal noise during frictional action.
【図面の簡単な説明】 第１図は本発明の実施例で得られた摩擦材の温度−摩擦
係数の特性及び摩擦温度−摩擦率の変化特性を示す図、
第２図は摩擦時間−摩擦温度特性及び摩擦時間−摩擦係
数特性を示す図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing temperature-friction coefficient characteristics and friction temperature-friction coefficient change characteristics of friction materials obtained in Examples of the present invention,
FIG. 2 is a diagram showing friction time-friction temperature characteristics and friction time-friction coefficient characteristics.
Claims (2)
泡体組織からなり、表面に発泡体組織の気泡の破壊によ
って形成された不定形の突縁を有することを特徴とする
カシューダスト。1. A cashew dust comprising a foam structure containing a polymerization reaction product of cashew nut shell liquid, and having an irregular edge formed on the surface by destruction of bubbles of the foam structure.
加えてアルデヒド類と反応硬化させ、得られた発泡固形
物を粉砕することを特徴とするカシューダストの製造方
法。2. A method for producing cashew dust, which comprises adding a foaming agent to polymerized cashew nut shell liquid, reacting and curing with an aldehyde, and crushing the obtained foamed solid matter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9174586A JPH073256B2 (en) | 1986-04-21 | 1986-04-21 | Cash-dust and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9174586A JPH073256B2 (en) | 1986-04-21 | 1986-04-21 | Cash-dust and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6372927A JPS6372927A (en) | 1988-04-02 |
| JPH073256B2 true JPH073256B2 (en) | 1995-01-18 |
Family
ID=14035067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9174586A Expired - Lifetime JPH073256B2 (en) | 1986-04-21 | 1986-04-21 | Cash-dust and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073256B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6366232A (en) * | 1986-09-05 | 1988-03-24 | Aisin Chem Co Ltd | Wet friction material |
| CN103741542B (en) * | 2013-12-19 | 2016-04-06 | 陕西科技大学 | A kind of boron carbide strengthens paper friction material and preparation method thereof |
-
1986
- 1986-04-21 JP JP9174586A patent/JPH073256B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6372927A (en) | 1988-04-02 |
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