JP3978841B2 - Conductive sliding member composition - Google Patents

Description

で示される結晶性、熱可塑性樹脂である。またＰＰＳ樹脂の種類として架橋タイプ、半架橋タイプ、直鎖タイプ、分枝状タイプのいずれも使用または併用することが可能である。
【０００７】
本発明に於いて用いる導電性チタン酸カリウム繊維（Ａ）は、通常、単体で１０¹Ω以下の抵抗値を示すチタン酸カリウム繊維である。
【０００８】
本発明においては、導電性チタン酸カリウム繊維（Ａ）の平均繊維径は0.01〜１μｍ、平均繊維長１〜100μｍ、平均繊維長/平均繊維径（アスペクト比）が10以上のものである。その製造方法は特公平2-1092及び特公平7-111026等に開示されている。
【０００９】
かかる導電性チタン酸カリウム繊維（Ａ）としては大塚化学社から‘デントール’等の商標で市販されている一般式
Ｋ₂Ｏ・ｎ（ＴiＯ_2-X）
（式中ｎは８以下の実数。Ｘは２未満の実数。）
で示される組成の単結晶繊維を用いることができる。
【００１０】
組成物全量に対する導電性チタン酸カリウム繊維（Ａ）の添加量は１０〜３０ｗｔ％の範囲が適当であり、好ましい範囲は１５〜３０ｗｔ％である。添加量が１０ｗｔ％未満であると金属酸化物併用によっても所望する導電性や補強効果が得られず、添加量が３０ｗｔ％を超えて使用しても添加量に見合う導電性や補強効果の向上が認められず不経済であり好ましくない。
【００１１】
本発明で使用するＰＴＦＥ樹脂（Ｂ）は４フッ化エチレンの重合体であり、微粉末状、繊維状のものが好ましく、ＰＰＳ樹脂に添加することにより摩擦係数を著しく低下させる効果がある。組成物全体に対するＰＴＦＥ樹脂（Ｂ）の添加量は１０〜３０ｗｔ％の範囲であり、好ましい添加量は２０〜３０ｗｔ％である。ＰＴＦＥ樹脂（Ｂ）の添加量が１０ｗｔ％より少ない場合は得られる樹脂組成物の自己潤滑性向上効果が乏しく好ましくない。またＰＴＦＥ樹脂（Ｂ）の添加量が３０ｗｔ％より多い場合は得られる樹脂組成物の機械的強度、成形加工性が著しく劣ることになり好ましくない。
【００１２】
本発明で用いる酸化亜鉛（Ｃ）は耐摩擦摩耗性の改善を実現すると同時にＰＰＳ樹脂組成物の機械特性を悪化させずに導電助剤としての役割を持たせることができる。
【００１３】
組成物全量に対する酸化亜鉛（Ｃ）の添加量は３〜１０ｗｔ％の範囲であり、更に好ましくは６〜１０ｗｔ％の範囲である。
【００１４】
また、本発明に使用する酸化亜鉛（Ｃ）はＰＴＦＥ樹脂（Ｂ）との併用で樹脂組成物の耐摩擦摩耗特性を向上させる。特に軟質相手材に対してはその効果が顕著であり、なかでも酸化亜鉛（Ｃ）が、ＰＴＦＥ樹脂（Ｂ）の添加量に対し、1/4〜1/2の配合比であって、かつ、導電性チタン酸カリウム繊維（Ａ）の添加量に対して1/4〜1/2の配合比である場合に軟質相手材の摩耗を改善する効果が著しい。また同様に導電性付与材との併用により導電助剤として働き樹脂組成物の導電性を安定化させる効果を持つ。
【００１５】
組成物全量に対する酸化亜鉛（Ｃ）の添加量を３ｗｔ％より少なくすると前記ＰＴＦＥ樹脂（Ｂ）及び導電性チタン酸カリウム繊維（Ａ）との配合比が実現できず添加による耐摩擦摩耗性の向上が乏しく好ましくない。また導電助剤としての働きも安定しない。また酸化亜鉛（Ｃ）の添加量が１０ｗｔ％を超えると前記同様にＰＴＦＥ樹脂（Ｂ）及び導電性チタン酸カリウム繊維（Ａ）との配合比が実現できず樹脂組成物の機械特性を悪化させるため好ましくない。特に前記酸化亜鉛（Ｃ）を導電性チタン酸カリウム繊維（Ａ）に対する導電性助剤として効果的にその役割を実現させるためには酸化亜鉛（Ｃ）と導電性チタン酸カリウム繊維（Ａ）との合計添加量が２０〜４０ｗｔ％であることが好ましい。
【００１６】
また本発明に使用する芳香族ポリアミド繊維（Ｄ）は、一般式
【化２】

で表され、優れた耐熱性、耐薬品性及び強靱性を有し、更に低摩擦性、非粘着性を兼ね備えている有機物繊維である。ＰＰＳ樹脂に添加混合することにより補強効果を発現すると共に摺動特性を安定化させる効果を発現する。
【００１７】
また芳香族ポリアミド繊維はガラス繊維や炭素繊維に見られるような摺動時に相手材を摩滅させることはない。特に、軟質相手材に対してこの効果が顕著である。
【００１８】
この様な芳香族ポリアミド繊維（Ｄ）として具体的にはデュポン社の“ケブラー”が挙げられる。組成物全量に対する芳香族ポリアミド繊維（Ｄ）の添加量は２〜２０ｗｔ％の範囲が適当であり、好ましくは４ｗｔ％〜１５ｗｔ％の範囲である。芳香族ポリアミド繊維の添加量が２ｗｔ％より少ないと得られる樹脂組成物に対する補強効果、摺動特性の安定化が認められない。また添加量が２０ｗｔ％を超えると成形性が著しく劣り、材料混練収率の低下、射出成形加工時の流動性低下、表面外観の低下を引き起こす為好ましくない。
【００１９】
以上本発明における樹脂組成物に於いては、前記した全ての添加材を添加することにより所望する効果が実現できる。つまり、導電性チタン酸カリウム繊維が添加されると必要な導電性と補強効果は得られ、ＰＴＦＥ樹脂を添加ことにより耐摩擦摩耗特が向上する。また、金属酸化物を添加することによりアルミなど軟質相手材に対する耐摩耗性と安定した導電性が得られ、芳香族ポリアミド繊維を添加することによりアルミなど軟質相手材に対する安定した摺動特性の向上が望める。
【００２０】
上記（Ａ）〜（Ｄ）成分をＰＰＳ樹脂と混合する方法は特に限定するものではなくドライブレンドする方法、溶融押出機を用いて溶融したＰＰＳ樹脂に混入する方法など公知の配合方法を自由に採用することができる。
【００２１】
またこの発明による樹脂組成物を成形するにあたっても特にその方法を限定するものではなく、圧縮成形、押出成形、射出成形などの通常の方法を自由に採用することができる。
【００２２】
かくして得られる成形品は、軸受け材等の摺動部品、なかでもアルミなど軟質材と摺動するような摺動部品として極めて有用である。また、２００℃以上の環境下で用いても相手材を損傷することなく良好な摺動特性を示すという特徴を有し、このような環境下で用いられる摺動部品として特に有用である。
【００２３】
【実施例】
以下に実施例を挙げ発明の具体化例及び具体的効果について記述する。
実施例１〜９，比較例１〜９
ＰＰＳ樹脂（東レ（株）製：ＰＰＳ原末Ｍ−２９００）、ＰＴＦＥ樹脂（三幸商事：ＳＧ−１０００）、亜鉛華（丸尾カルシウム製：亜鉛華ＺＡ−１００）、芳香族ポリアミド繊維（デュポン東レ製：ＫＣ−２０）、導電性チタン酸カリウム繊維（大塚化学製：“デントール”ＢＫ−３００）を下表−１に示す配合組成で配合し、まず原材料全てをヘンシェルミキサーにより混合した後シリンダ温度３００℃に設定された二軸押出機に供給し毎分７０〜１００回転で溶融混練し押出造粒した。次に得られた組成物をインラインスクリュウ式射出成形機を用いて金型温度１４０℃、成形温度３１０℃の成形条件下に於いて図１に示す形状の軸受け試験片及び物性測定用テストピースを作製した。
【００２４】
図１は軸受け試験片の斜視図であり、図２は軸受け摩耗試験機の概念図である。 摩耗試験機において、摩擦力検出軸３に取り付けられた軸受け成形品１は、回転軸６に挿入される。軸受け成形品１に対する負荷荷重は、負荷用エアシリンダー５を介して加圧ローラー７により加えられる。軸受け成形品１と回転軸６との摩擦力は、摩擦力検出軸３を通して摩擦力検出ロードセル４により検出される。
【００２５】
得られた各試験片について機械的強度、電気特性及び図２に示す試験機により軸受け摩耗試験を行った。その結果を表−１、２、３に示す。
【００２６】
体積固有抵抗：１０⁴Ω未満は４端子法により、１０⁴Ω以上のものについては
ＡＳＴＭ Ｄ−２５７に準拠して測定した。
【００２７】
引張強度 ：ＡＳＴＭ Ｄ−６３８に準拠して測定した
曲げ弾性率 ：ＡＳＴＭ Ｄ−７９０に準拠して測定した。
【００２８】
軸受け摩耗試験の試験条件は次の通りである。
【００２９】
試 験 機：ラジアル軸受け摩耗試験機
荷 重 ：５kg/cｍ² 、１０kg/cｍ²
すべり速度：１０m/分
試験時間 ：２００時間、５０時間
軸 材：Ａｌ５０５６
軸・軸受け間隙：０．５mm
摩擦係数 ：軸受け成形品と回転軸の摩擦力を負荷荷重で割った値。図２に示す４の摩擦力検出ロードセルから得られる摩擦力と５の負荷シリンダーによる負荷荷重より算出する。
【００３０】
摩耗深さ ：所定試験時間終了後の軸受け成形品の内径寸法変化量。
【００３１】
軸面粗度変化：所定試験時間経過後の回転軸表面（軸受け成形品との接触面）の中心線平均粗さ（Ｒａ）と試験前の回転軸表面の中心線平均粗さ（Ｒａ）の差を求めた。
【００３２】
【表１】

【表２】

【表３】

次に上記実施例に対する比較例として表−１に示す配合組成より成る樹脂材料を使用して前記実施例同様に試験片を作製し、同一条件下で機械的強度、電気特性及び軸受け摩耗試験を実施した。
【００３３】
比較例１〜９においては表１より明らかなように、導電チタン酸カリウム繊維、亜鉛華が所定量添加されていない比較例４は弾性率が劣り、かつ導電性がない。フッ素樹脂や芳香族ポリアミド繊維の添加量が多いと造粒できない（比較例６，７）。また、表２および表３から明らかなように、フッ素樹脂の添加量の少ない物は摺動特性が劣り（比較例８，９）、芳香族ポリアミド繊維と金属酸化物のいずれかを添加しないものは摩耗量が大きくなる（比較例１，２，３，５）。一方、導電性チタン酸カリウム繊維、ＰＴＦＥ樹脂、芳香族ポリアミド繊維および特定の金属酸化物をすべて所定量配合した実施例１〜９においては、優れた導電性が得られかつ充分な強度・剛性を実現し、さらに摺動時に軟質材に対する攻撃と摩耗を抑えることのできる組成物が得られた。
【００３４】
【発明の効果】
以上述べたように本発明による樹脂組成物より成る成形品は低摩擦係数、低摩耗量であり機械的強度も充分あり極めて優秀な摺動部品である。さらに10²Ω・cmという低い体積固有抵抗が安定した導電性を実現し、耐摩耗性と導電性の２つの機能を同時に要求される用途、例えば複写機やプリンターのアースや導電ベアリング、ＯＡ機器類のキャリッジベアリングなどの素材として最適であるといえる。また本発明による樹脂組成物は通常の軸受け材料としても優れている為あらゆる軸受けに利用でき、かつ摩耗粉の付着や軸受けへのゴミや埃また複写機やプリンターに使用されるトナーの付着を防止でき安定した摺動性が望める。さらにアルミなどの軟質相手材を摺動時に傷つけないという特性がＯＡ機器類の摺動部材として最適であることから本発明の意義は極めて重要であると言える。本発明は導電性を具備しかつ軟質相手材を傷つけることなく高温・高負荷条件下に於いても実用可能な摺動部材を提供し得る。
【図面の簡単な説明】
【図１】 ラジアル軸受け摩耗試験用軸受け成形品である。
【図２】 ラジアル軸受け摩耗試験機の概念図である。
【符号の説明】
１．軸受け成形品
２．高温槽
３．摩擦力検出軸
４．摩擦力検出ロードセル
５．負荷用エアシリンダー
６．回転軸
７．加圧ローラー[0001]
BACKGROUND OF THE INVENTION
The present invention is composed of polyphenylene sulfide resin (hereinafter referred to as PPS resin) as a main component, and has stable conductivity from room temperature to high temperature, and has excellent mechanical strength, friction wear resistance and other mechanical properties. The present invention relates to a member composition.
[0002]
[Prior art]
Conventionally, graphite as the sliding member by the PPS resin, polytetrafluoride ii ethylene resin (PTFE resin), aromatic polyamide fibers, inorganic compounds, solid lubricant, the composition according to any combination of such metal oxides and lubricants Are known. For example, a composition in which potassium titanate fiber is added to a PPS resin in JP-A-59-215353, a composition in which potassium titanate fiber and mineral oil are added to a PPS resin in JP-A-58-152051, A resin composition comprising aramid fiber and / or potassium titanate fiber and PTFE resin, molybdenum sulfide, ultrahigh molecular weight polyethylene in PPS resin, PTFE resin, metal oxide, aromatic polyamide fiber in PPS resin in JP-B-60-11061, A resin composition comprising a metal powder, a resin composition comprising a fluororesin and an aromatic polyamide fiber in a PPS resin in JP-B-4-65866 are known.
[0003]
Further, as a conductive resin material, a method by adding carbon fiber, carbon black, and an inorganic compound or inorganic fiber imparted with conductivity is known. For example, a resin composition in which conductive potassium titanate fiber and conductive carbon black are added to a thermoplastic resin in JP-A-2-67358, and conductive potassium titanate fiber and conductive carbon black in a thermoplastic resin in JP-B-4-68348 And a resin composition containing glass fiber and / or carbon fiber, mica whose surface is coated with nickel on PPS resin in Japanese Patent Publication No. 5-61306, wollastonite or potassium titanate fiber whose surface is coated with nickel, carbon fiber , PTFE resin, the resin composition or the like obtained by adding two vulcanization molybdenum is known.
[0004]
[Problems to be solved by the invention]
The required properties of the conductive sliding member are good friction and wear resistance, stable conductivity and good mechanical strength. In the prior art, materials that satisfy a certain degree of sliding material properties with respect to steel have been supplied. However, in the OA equipment field, which is expanding the market due to the recent trend of OA, it is still not enough for sliding with aluminum materials widely used for mechanical parts for the purpose of reducing the size and weight. There was no material. As is well known, an aluminum material is softer than a steel material and easily wears during sliding. In the application of the prior art, there was no conductive sliding member satisfying good sliding characteristics, stable conductivity, and mechanical strength from room temperature to high temperature for this soft aluminum. That is, if a normal inorganic compound or carbon fiber is used as a filler, the soft partner material is damaged and cannot be used. When graphite is used, the friction coefficient decreases, but the wear is large and the reinforcing effect on the resin is small. In particular, in the case of conductive carbon black, it is necessary to add 10 wt% or more in order to give stable conductivity, but with this addition amount, it becomes impossible to maintain the mechanical strength of the resin molded product. In addition, the addition of lubricating oil has the disadvantage that its sliding characteristics cannot be maintained for a long time in a high temperature atmosphere.
[0005]
[Means for Solving the Problems]
That is, the present invention
(1) Polyphenylene sulfide resin is used as a base resin, and (A) conductive potassium titanate whisker is 10 to 30 wt% based on the entire composition, and (B) polytetrafluoroethylene resin is 10 to 10% based on the entire composition. 30 wt%, the addition of (C) 10 wt%. 3 to on the whole composition of zinc oxide and (D) an aromatic polyamide fiber containing. 2 to 20 wt% relative to the total composition, of zinc oxide (C) The amount is 1/4 to 1/2 with respect to the addition amount of the polytetrafluoroethylene resin (B) and 1/4 to 1/2 with respect to the addition amount of the conductive potassium titanate fiber (A). A conductive sliding member composition characterized by that.
(2) The above (1), wherein the total amount of the conductive potassium titanate fiber (A) and the metal oxide (C) is in the range of 20 to 40 wt% with respect to the entire composition. The conductive sliding member composition according to the description,
(3) A sliding component comprising the conductive sliding member composition according to any one of (1) to (2) above,
(4) The sliding component according to (3) above, wherein the sliding component is used in an environment of 200 ° C. or higher, and [0006]
DETAILED DESCRIPTION OF THE INVENTION
The PPS resin used as the base resin in the present invention has the general formula:

It is a crystalline and thermoplastic resin represented by Moreover, as a kind of PPS resin, any of a crosslinked type, a semi-crosslinked type, a linear type, and a branched type can be used or used together.
[0007]
The conductive potassium titanate fiber (A) used in the present invention is usually a potassium titanate fiber that exhibits a resistance value of 10 ¹ Ω or less as a single substance.
[0008]
In the present invention, the conductive potassium titanate fiber (A) has an average fiber diameter of 0.01 to 1 μm, an average fiber length of 1 to 100 μm, and an average fiber length / average fiber diameter (aspect ratio) of 10 or more. The manufacturing method is disclosed in Japanese Patent Publication No. 2-1092 and Japanese Patent Publication No.7-111026.
[0009]
Such conductive potassium titanate fibers (A) are commercially available from Otsuka Chemical Co., Ltd. under the trademark “Dentol”, etc., and have the general formula K ₂ O · n (TiO _2−X ).
(In the formula, n is a real number of 8 or less. X is a real number of less than 2.)
A single crystal fiber having a composition represented by the following can be used.
[0010]
The amount of the conductive potassium titanate fiber (A) added to the total amount of the composition is suitably in the range of 10 to 30 wt%, and preferably in the range of 15 to 30 wt%. If the added amount is less than 10 wt%, the desired conductivity and reinforcing effect cannot be obtained even when the metal oxide is used in combination, and even if the added amount exceeds 30 wt%, the conductivity and reinforcing effect corresponding to the added amount can be obtained. An improvement is not recognized and it is uneconomical and not preferable.
[0011]
The PTFE resin (B) used in the present invention is a polymer of ethylene tetrafluoride, preferably in the form of fine powder or fiber, and has the effect of remarkably reducing the friction coefficient when added to the PPS resin. The addition amount of PTFE resin (B) with respect to the whole composition is in the range of 10 to 30 wt%, and the preferred addition amount is 20 to 30 wt%. When the amount of the PTFE resin (B) added is less than 10 wt%, the effect of improving the self-lubricity of the resulting resin composition is poor, which is not preferable. Moreover, when there is more addition amount of PTFE resin (B) than 30 wt%, the mechanical strength of the resin composition obtained and the moldability will become remarkably inferior, and it is not preferable.
[0012]
Zinc oxide (C) used in the present invention can improve frictional wear resistance and at the same time serve as a conductive auxiliary agent without deteriorating the mechanical properties of the PPS resin composition .
[0013]
The addition amount of zinc oxide (C) with respect to the total amount of the composition is in the range of 3 to 10 wt%, more preferably in the range of 6 to 10 wt%.
[0014]
Moreover, the zinc oxide (C) used for this invention improves the friction-and-wear characteristic of a resin composition by using together with PTFE resin (B). In particular, the effect is remarkable for soft mating materials, and zinc oxide (C) has a blending ratio of 1/4 to 1/2 with respect to the added amount of PTFE resin (B), and When the blending ratio is 1/4 to 1/2 with respect to the added amount of the conductive potassium titanate fiber (A), the effect of improving the wear of the soft mating material is remarkable. Similarly, when used in combination with a conductivity-imparting material, it acts as a conductive assistant and has the effect of stabilizing the conductivity of the resin composition.
[0015]
If the amount of zinc oxide (C) added to the total amount of the composition is less than 3 wt%, the blending ratio of the PTFE resin (B) and the conductive potassium titanate fiber (A) cannot be realized, and the frictional wear resistance is improved by the addition. It is not preferable because of lack of. In addition, the function as a conductive aid is not stable. Moreover, when the addition amount of zinc oxide (C) exceeds 10 wt%, the blending ratio of PTFE resin (B) and conductive potassium titanate fiber (A) cannot be realized as above, and the mechanical properties of the resin composition are deteriorated. This is not preferable. In particular, in order to effectively realize the role of the zinc oxide (C) as a conductive auxiliary agent for the conductive potassium titanate fiber (A), the zinc oxide (C) and the conductive potassium titanate fiber (A) It is preferable that the total addition amount of 20 to 40 wt%.
[0016]
The aromatic polyamide fiber (D) used in the present invention has the general formula:

It is an organic fiber having excellent heat resistance, chemical resistance and toughness, and also having low friction and non-adhesiveness. Addition and mixing to the PPS resin produces a reinforcing effect and an effect of stabilizing the sliding characteristics.
[0017]
In addition, the aromatic polyamide fiber does not wear the mating material during sliding as seen in glass fiber or carbon fiber. In particular, this effect is remarkable for soft mating materials.
[0018]
Specific examples of such aromatic polyamide fiber (D) include “Kevlar” manufactured by DuPont. The amount of the aromatic polyamide fiber (D) added to the total amount of the composition is suitably in the range of 2 to 20 wt%, preferably in the range of 4 to 15 wt%. When the amount of the aromatic polyamide fiber added is less than 2 wt%, the reinforcing effect and the sliding property stabilization for the resin composition obtained are not recognized. On the other hand, if the addition amount exceeds 20 wt%, the moldability is remarkably inferior, which causes a decrease in material kneading yield, a decrease in fluidity during injection molding, and a decrease in surface appearance.
[0019]
Or In the resin composition of the present invention, the desired effect by adding all the additives mentioned above are ∎ You can in realization. That is, when the conductive potassium titanate fiber is added, necessary conductivity and reinforcing effect can be obtained, and by adding the PTFE resin, the friction wear resistance is improved. Addition of metal oxide provides wear resistance and stable conductivity for soft mating materials such as aluminum, and addition of aromatic polyamide fiber improves stable sliding characteristics for soft mating materials such as aluminum. Can be expected.
[0020]
The method of mixing the above components (A) to (D) with the PPS resin is not particularly limited, and a known blending method such as a dry blending method or a method of mixing with a melted PPS resin using a melt extruder can be freely used. Can be adopted.
[0021]
Also, the method for molding the resin composition according to the present invention is not particularly limited, and ordinary methods such as compression molding, extrusion molding, and injection molding can be freely employed.
[0022]
The molded product thus obtained is extremely useful as a sliding component such as a bearing material, especially as a sliding component that slides with a soft material such as aluminum. Further, even when used in an environment of 200 ° C. or higher, it has a feature of showing good sliding characteristics without damaging the counterpart material, and is particularly useful as a sliding component used in such an environment.
[0023]
【Example】
Examples of the invention and specific effects will be described below with reference to examples.
Examples 1-9, Comparative Examples 1-9
PPS resin (manufactured by Toray Industries, Inc .: PPS bulk powder M-2900), PTFE resin (Sanko Shoji: SG-1000), zinc white (manufactured by Maruo Calcium: zinc white ZA-100), aromatic polyamide fiber (manufactured by DuPont Toray) : KC-20), conductive potassium titanate fiber (Otsuka Chemical Co., Ltd .: “Dentor” BK-300) was blended with the blending composition shown in Table 1 below. First, all the raw materials were mixed with a Henschel mixer, and then the cylinder temperature 300 The mixture was supplied to a twin screw extruder set at ° C., melt kneaded at 70 to 100 revolutions per minute, and extruded and granulated. Next, using the inline screw type injection molding machine, the obtained composition was subjected to molding of a bearing test piece having the shape shown in FIG. 1 and a test piece for measuring physical properties under molding conditions of a mold temperature of 140 ° C. and a molding temperature of 310 ° C. Produced.
[0024]
FIG. 1 is a perspective view of a bearing test piece, and FIG. 2 is a conceptual diagram of a bearing wear tester. In the wear tester, the bearing molded product 1 attached to the frictional force detection shaft 3 is inserted into the rotary shaft 6. The load applied to the bearing molded product 1 is applied by the pressure roller 7 through the load air cylinder 5. The frictional force between the bearing molded product 1 and the rotating shaft 6 is detected by the frictional force detection load cell 4 through the frictional force detection shaft 3.
[0025]
Each of the obtained test pieces was subjected to a bearing wear test using a mechanical strength, electrical characteristics, and a testing machine shown in FIG. The results are shown in Tables 1, 2, and 3.
[0026]
Volume resistivity: Less than 10 ⁴ Ω was measured in accordance with ASTM D-257 for those with 10 ⁴ Ω or more by the 4-terminal method.
[0027]
Tensile strength: Flexural modulus measured according to ASTM D-638: Measured according to ASTM D-790.
[0028]
The test conditions for the bearing wear test are as follows.
[0029]
Test machine: Radial bearing wear test machine Load: 5kg / cm ² , 10kg / cm ²
Sliding speed: 10 m / min Test time: 200 hours, 50 hours Shaft material: Al5056
Bearing / bearing gap: 0.5mm
Friction coefficient: Value obtained by dividing the friction force between the bearing molded product and the rotating shaft by the load. It is calculated from the friction force obtained from the friction force detection load cell 4 shown in FIG. 2 and the load applied by the load cylinder 5.
[0030]
Wear depth: The amount of change in the inner diameter of the bearing molded product after the end of the specified test time.
[0031]
Shaft surface roughness change: between the centerline average roughness (Ra) of the surface of the rotating shaft (contact surface with the bearing molded product) after the lapse of a predetermined test time and the centerline average roughness (Ra) of the rotating shaft surface before the test. The difference was determined.
[0032]
[Table 1]

[Table 2]

[Table 3]

Next, as a comparative example with respect to the above example, a test piece was prepared in the same manner as in the above example using a resin material having the composition shown in Table 1, and mechanical strength, electrical characteristics and bearing wear test were performed under the same conditions. Carried out.
[0033]
As is clear from Table 1 in Comparative Examples 1 to 9, Comparative Example 4 in which a predetermined amount of conductive potassium titanate fiber and zinc white is not added has inferior elastic modulus and is not conductive. If the amount of fluororesin or aromatic polyamide fiber added is large, granulation cannot be performed (Comparative Examples 6 and 7). Further, as is apparent from Tables 2 and 3, those having a small amount of fluororesin added have poor sliding characteristics (Comparative Examples 8 and 9) and do not add any of aromatic polyamide fibers and metal oxides. Increases the amount of wear (Comparative Examples 1, 2, 3, and 5). On the other hand, in Examples 1 to 9 in which predetermined amounts of conductive potassium titanate fiber, PTFE resin, aromatic polyamide fiber and specific metal oxide were blended, excellent conductivity was obtained and sufficient strength and rigidity were obtained. A composition that can be realized and that can suppress attack and wear against the soft material when sliding is obtained.
[0034]
【The invention's effect】
As described above, the molded article made of the resin composition according to the present invention is a very excellent sliding part having a low coefficient of friction, a low amount of wear and sufficient mechanical strength. Furthermore, low volume resistivity of 10 ² Ω · cm realizes stable conductivity, and applications that require both wear resistance and conductivity simultaneously, such as copier and printer grounds, conductive bearings, and office automation equipment. It can be said that it is most suitable as a material for the carriage bearings. In addition, the resin composition according to the present invention is excellent as a normal bearing material, so it can be used for any bearings, and prevents the adhesion of abrasion powder, dust and dirt on the bearings, and toner used in copiers and printers. Stable slidability can be expected. Furthermore, since the characteristic of not damaging a soft mating material such as aluminum when sliding is optimal as a sliding member for OA equipment, it can be said that the significance of the present invention is extremely important. INDUSTRIAL APPLICABILITY The present invention can provide a sliding member that has electrical conductivity and can be practically used even under high temperature and high load conditions without damaging a soft mating material.
[Brief description of the drawings]
FIG. 1 is a bearing molded product for a radial bearing wear test.
FIG. 2 is a conceptual diagram of a radial bearing wear tester.
[Explanation of symbols]
1. 1. Bearing molded product 2. High temperature bath 3. Friction force detection shaft 4. Friction force detection load cell 5. Air cylinder for load Rotating shaft7. Pressure roller

Claims (5)

The polyphenylene sulfide resin as a base resin, to which (A) the whole conductive potassium titanate whiskers composition to 10~ 30 wt%, (B) to polytetrafluoroethylene resin on total composition. 10 to 30 wt% , (C) zinc oxide 3 to 10 wt% with respect to the entire composition and (D) aromatic polyamide fiber 2 to 20 wt% with respect to the entire composition, and the amount of zinc oxide (C) added is It is 1/4 to 1/2 with respect to the addition amount of the polytetrafluoroethylene resin (B) and 1/4 to 1/2 with respect to the addition amount of the conductive potassium titanate fiber (A). A conductive sliding member composition. Conductive potassium titanate fiber (A) and zinc oxide (C) a conductive claim 1 Symbol mounting, characterized in that in the range of 20 to 40 wt% total addition amount of the total composition of A sliding member composition. A sliding component comprising the conductive sliding member composition according to claim 1 . The sliding component according to claim 3 , wherein the sliding component is used in an environment of 200 ° C or higher. The sliding component according to claim 3 , wherein the sliding component is a bearing component for a sliding bearing.

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