JP2003213063A - Seal composition and seal using the same and used for rotary shaft - Google Patents
Seal composition and seal using the same and used for rotary shaftInfo
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- JP2003213063A JP2003213063A JP2002019722A JP2002019722A JP2003213063A JP 2003213063 A JP2003213063 A JP 2003213063A JP 2002019722 A JP2002019722 A JP 2002019722A JP 2002019722 A JP2002019722 A JP 2002019722A JP 2003213063 A JP2003213063 A JP 2003213063A
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- seal
- weight
- rotary shaft
- carbon fiber
- graphite powder
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シール用組成物お
よびそれを用いた回転軸用シールに関する。TECHNICAL FIELD The present invention relates to a sealing composition and a rotary shaft seal using the same.
【０００２】[0002]
【従来の技術】従来より、冷凍機やエアコンディショナ
機のコンプレッサ、ポンプ、ギヤポンプなどにおいて
は、回転軸に当接させて流体（気体、液体）を密封する
ための回転軸用シールが使用されている。当該回転軸用
シールの形成材料としては、各種の充填材を配合してな
るフッ素樹脂、中でもポリテトラフルオロエチレン（Ｐ
ＴＦＥ）が汎用されている。2. Description of the Related Art Conventionally, in compressors, pumps, gear pumps, etc. of refrigerators and air conditioners, rotary shaft seals for contacting a rotary shaft to seal fluid (gas, liquid) have been used. ing. As a material for forming the rotary shaft seal, a fluororesin mixed with various fillers, especially polytetrafluoroethylene (P
TFE) is widely used.
【０００３】回転軸用シールの形成に際しＰＴＦＥに配
合する充填材としては、繊維状の充填材（ガラスファイ
バ、カーボンファイバなど）や粒状の充填材（カーボン
粉末、グラファイト粉末、ブロンズ粉末、耐熱性樹脂粉
末など）が多く用いられてきたが、カーボン粉末やグラ
ファイト粉末など、粒状の充填材のみを配合した回転軸
用シールは、補強性（機械的特性）に劣り、耐磨耗性が
不充分であった。As a filler to be added to PTFE when forming a seal for a rotary shaft, fibrous fillers (glass fiber, carbon fiber, etc.) and granular fillers (carbon powder, graphite powder, bronze powder, heat resistant resin) However, the seal for rotary shafts containing only granular fillers such as carbon powder and graphite powder has poor reinforcement (mechanical properties) and insufficient wear resistance. there were.
【０００４】特開平２−３８８３２号公報には、ＰＴＦ
Ｅに繊維系のカーボンファイバと粒状のグラファイト粉
末とを併用して配合した円板状のシール部材を備える軸
封装置が提案されている。しかしながら、このような軸
封装置のシール部材では、上述したような耐磨耗性は改
善されるものの、比較的大きな平均繊維長（平均繊維
長：０．１３ｍｍ）のカーボンファイバが使用されてい
るため、ガスが通過し得るようなパス（通路）が形成さ
れ易く、ガスバリア性が不充分であった。カーエアコン
用のコンプレッサなどにおける気体を密封対象とする回
転軸用シール（たとえば、ラジアルシールのシールリッ
プ部）においては、シール厚みが約１ｍｍ程度の薄い肉
厚でシールするものもあり、このように肉厚の薄いシー
ルでは特に、上記ガスバリア性が低下する傾向にあっ
た。上記カーエアコン用のコンプレッサなどにおいて
は、シールによってガスが充填されていなければ働きが
不充分となる（エアコンの効きが悪くなるなど）ことが
多く、ガスバリア性に優れることは極めて重要であり、
耐磨耗性に加えてガスバリア性についても優れる回転軸
用シールの開発が求められている。Japanese Patent Laid-Open No. 2-38832 discloses PTF.
A shaft sealing device has been proposed which is provided with a disk-shaped sealing member in which E is mixed with a fiber-based carbon fiber and granular graphite powder. However, in the seal member of such a shaft sealing device, although the above-mentioned abrasion resistance is improved, carbon fibers having a relatively large average fiber length (average fiber length: 0.13 mm) are used. Therefore, a path (passage) through which gas can pass is easily formed, and the gas barrier property is insufficient. Some rotary shaft seals (for example, seal lips of radial seals) for sealing gas in compressors for car air conditioners have a thin seal thickness of about 1 mm. Especially in the case of thin-walled seals, the gas barrier properties tended to deteriorate. In the above-mentioned car air conditioner compressor and the like, unless the seal is filled with gas, the function is often inadequate (the effect of the air conditioner becomes poor), and it is extremely important that the gas barrier property is excellent.
It is required to develop a seal for a rotating shaft that is excellent not only in abrasion resistance but also in gas barrier property.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上記課題を
解決するためになされたものであって、その目的とする
ところは、耐磨耗性およびガスバリア性に優れる回転軸
用シールを形成し得るシール用組成物を提供することで
ある。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to form a seal for a rotary shaft having excellent wear resistance and gas barrier properties. It is to provide a sealing composition to be obtained.
【０００６】[0006]
【課題を解決するための手段】本発明者は、上記課題を
解決するため鋭意研究を行った結果、本発明を完成する
に至った。即ち、本発明は以下のとおりである。
（１）フッ素樹脂に、平均粒径１０μｍ〜５０μｍのグ
ラファイト粉末を１０重量％〜２５重量％、平均繊維長
５μｍ〜６０μｍのカーボンファイバを１重量％〜１０
重量％配合してなる、シール用組成物。
（２）フッ素樹脂が、ポリテトラフルオロエチレンであ
る上記（１）に記載のシール用組成物。
（３）上記（１）または（２）に記載の組成物を成形し
たものである回転軸用シール。The inventor of the present invention has completed the present invention as a result of intensive studies to solve the above-mentioned problems. That is, the present invention is as follows. (1) 10 wt% to 25 wt% of graphite powder having an average particle diameter of 10 μm to 50 μm, and 1 wt% to 10 wt% of carbon fiber having an average fiber length of 5 μm to 60 μm in a fluororesin.
A sealing composition which is blended by weight. (2) The sealing composition according to (1) above, wherein the fluororesin is polytetrafluoroethylene. (3) A seal for a rotating shaft, which is obtained by molding the composition described in (1) or (2) above.
【０００７】[0007]
【発明の実施の形態】以下、本発明を詳細に説明する。
本発明のシール用組成物は、フッ素樹脂と、特定範囲の
平均粒径のグラファイト粉末と、特定範囲の平均繊維長
のカーボンファイバとを、当該組成物中それぞれ特定範
囲の割合で配合してなるものである。本発明におけるフ
ッ素樹脂としては、特には限定されず、従来公知の種々
のフッ素樹脂を使用することができるが、融点が高く、
また相手部材（回転軸）との密着性（なじみ性）が良好
である（硬度が高すぎる材料をシールに用いると、相手
部材との密着性が悪い）という理由から、ポリテトラフ
ルオロエチレン（ＰＴＦＥ）、テトラフルオロエチレン
−パーフルオロアルキルビニルエーテルコポリマー（Ｐ
ＦＡ）が好ましく、ＰＴＦＥが特に好ましい。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
The sealing composition of the present invention comprises a fluororesin, a graphite powder having an average particle size in a specific range, and a carbon fiber having an average fiber length in a specific range, each being mixed in a specific range ratio in the composition. It is a thing. The fluororesin in the present invention is not particularly limited, and various conventionally known fluororesins can be used, but the melting point is high,
In addition, polytetrafluoroethylene (PTFE) has a good adhesion (compatibility) with the mating member (rotating shaft) (if a material having too high hardness is used for the seal, the adhesion with the mating member is poor). ), Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (P
FA) is preferred and PTFE is particularly preferred.
【０００８】本発明のシール用組成物においては、平均
粒径が１０μｍ〜５０μｍ、好ましくは２０μｍ〜３０
μｍのグラファイト粉末が配合される。平均粒径が１０
μｍ未満のグラファイト粉末を用いると、得られた回転
軸用シールにおいて、引張強さや伸びなど機械特性に劣
ってしまう不具合があり、結果的に優れた耐磨耗性が得
られなくなる。また平均粒径が５０μｍを超えたグラフ
ァイト粉末を用いると、ＰＴＦＥとの混合の際分散性が
不良となってしまい、得られた回転軸用シールごとに特
性がばらついてしまう。In the sealing composition of the present invention, the average particle diameter is 10 μm to 50 μm, preferably 20 μm to 30 μm.
μm graphite powder is blended. Average particle size is 10
When graphite powder having a particle size of less than μm is used, the resulting seal for a rotary shaft has a problem that mechanical properties such as tensile strength and elongation are inferior, and as a result, excellent wear resistance cannot be obtained. Further, if graphite powder having an average particle size of more than 50 μm is used, the dispersibility becomes poor when mixed with PTFE, and the characteristics vary depending on the obtained rotary shaft seals.
【０００９】グラファイト粉末の平均粒径は、たとえば
以下の手順にて測定できる。グラファイト粉末を水また
はエタノールなどの有機液体に投入し、３５ｋＨｚ〜４
０ｋＨｚ程度の超音波を付与した状態にて約２分間分散
処理して得た分散液を用い、かつその場合の粒状物の量
は該分散液のレーザ透過率（入射光量に対する出力光量
の比）が７０％〜９５％となる量とし、次いで該分散液
について、マイクロトラック粒度分析計にかけてレーザ
ー光の散乱により個々の粒状物の粒径（Ｄ１、Ｄ２、Ｄ
３、…）、および各粒径ごとの存在個数（Ｎ１、Ｎ２、
Ｎ３、…）を計測する（個々の粒状物の粒径（Ｄ）は、
マイクロトラック粒度分析形によれば種々の形状の粒状
物ごとに球相当径が自動的に測定される。）。視野内に
存在する個々の粒子の個数（Ｎ）と各粒径（Ｄ）とか
ら、下記式（１）にて平均粒径を算出する。
平均粒径＝（ΣＮＤ3／ΣＮ）1/3 （１）The average particle size of the graphite powder can be measured, for example, by the following procedure. Put the graphite powder into water or an organic liquid such as ethanol, 35kHz ~ 4
A dispersion liquid obtained by performing a dispersion treatment for about 2 minutes while applying an ultrasonic wave of about 0 kHz is used, and the amount of particles in this case is the laser transmittance of the dispersion liquid (ratio of output light amount to incident light amount). Of 70% to 95%, and then the dispersion is subjected to a Microtrac particle size analyzer to measure the particle size (D1, D2, D
3, ...) and the number of existing particles (N1, N2,
N3, ...) is measured (the particle size (D) of each granular material is
According to the Microtrac particle size analysis method, the sphere-equivalent diameter is automatically measured for each of various particle shapes. ). The average particle size is calculated by the following formula (1) from the number (N) of individual particles existing in the visual field and each particle size (D). Average particle size = (ΣND 3 / ΣN) 1/3 (1)
【００１０】本発明におけるグラファイト粉末として
は、人造または天然の鱗状黒鉛や鱗片状黒鉛、土状黒鉛
など従来公知の種々のグラファイト粉末を特に制限なく
使用することができるが、品質が安定していることから
人造の黒鉛が好ましく、中でも得られた回転軸用シール
が潤滑性に優れる点から人造の鱗状黒鉛が好ましい。As the graphite powder in the present invention, various conventionally known graphite powders such as artificial or natural scaly graphite, scaly graphite and earthy graphite can be used without particular limitation, but the quality is stable. Therefore, artificial graphite is preferable, and among them, artificial scaly graphite is preferable because the obtained seal for rotary shaft has excellent lubricity.
【００１１】本発明のシール用組成物において上記平均
粒径を有するグラファイト粉末は、１０重量％〜２５重
量％、好ましくは１０重量％〜２０重量％配合される。
グラファイト粉末が１０重量％未満しか配合されない
と、得られた回転軸用シールにおいて耐磨耗性が悪くな
る不具合があり、またグラファイト粉末が２５重量％を
超えて配合されると、得られた回転軸用シールにおいて
機械的特性、特に伸びが低下する不具合がある。In the sealing composition of the present invention, the graphite powder having the above-mentioned average particle size is blended in an amount of 10% by weight to 25% by weight, preferably 10% by weight to 20% by weight.
If the graphite powder is blended in less than 10% by weight, the resulting rotary shaft seal has a problem that the wear resistance is deteriorated, and if the graphite powder is blended in more than 25% by weight, the rotation The shaft seal has a problem that mechanical properties, especially elongation is reduced.
【００１２】また本発明のシール用組成物においては、
平均繊維長が５μｍ〜６０μｍ、好ましくは５μｍ〜３
０μｍのカーボンファイバが配合される。平均繊維長が
５μｍ未満のカーボンファイバを用いると、得られた回
転軸用シールにおいて耐磨耗性が悪くなってしまう。ま
た平均繊維長が６０μｍを超えたカーボンファイバを用
いると、得られた回転軸用シールにおいてガスバリア性
が悪くなってしまう。Further, in the sealing composition of the present invention,
Average fiber length is 5 μm to 60 μm, preferably 5 μm to 3
0 μm carbon fiber is blended. If a carbon fiber having an average fiber length of less than 5 μm is used, the resulting rotary shaft seal has poor wear resistance. Further, when a carbon fiber having an average fiber length of more than 60 μm is used, the gas barrier property of the obtained seal for a rotating shaft is deteriorated.
【００１３】カーボンファイバの平均繊維長は、たとえ
ば、当分野で通常行われる手法である画像解析法によっ
て測定できる。The average fiber length of the carbon fiber can be measured, for example, by an image analysis method which is a common method in the art.
【００１４】また、本発明に使用するカーボンファイバ
は、アスペクト比（繊維径あたりの繊維長の平均）が
０．５〜５であるのが好ましく、０．５〜３であるのが
より好ましい。The carbon fiber used in the present invention preferably has an aspect ratio (average fiber length per fiber diameter) of 0.5 to 5, and more preferably 0.5 to 3.
【００１５】本発明におけるカーボンファイバとして
は、特に制限はなく、ピッチ系カーボンファイバ、ＰＡ
Ｎ系カーボンファイバ、レーヨン系カーボンファイバな
ど、従来公知の種々のカーボンファイバを使用すること
ができるが、中でもピッチ系カーボンファイバ、特に
は、黒鉛化したピッチ系カーボンファイバが好適であ
る。ピッチ系カーボンファイバは、たとえば、不活性気
体中で２０００℃〜３０００℃の熱処理を行うことで黒
鉛化される。The carbon fiber in the present invention is not particularly limited, and pitch-based carbon fiber, PA
Various conventionally known carbon fibers such as N-based carbon fiber and rayon-based carbon fiber can be used. Among them, pitch-based carbon fiber, particularly graphitized pitch-based carbon fiber is preferable. The pitch-based carbon fiber is graphitized by performing heat treatment at 2000 ° C. to 3000 ° C. in an inert gas, for example.
【００１６】本発明のシール用組成物において上記平均
繊維長を有するカーボンファイバは、１重量％〜１０重
量％、好ましくは２重量％〜５重量％配合される。カー
ボンファイバが１重量％未満しか配合されないと、得ら
れた回転軸用シールにおいて耐磨耗性が低下する不具合
があり、またカーボンファイバが１０重量％を超えて配
合されると、得られた回転軸用シールにおいて潤滑性が
低下し、相手部材（回転軸）を磨耗させてしまうととも
に、ガスが透過しやすくなってしまう不具合がある。The carbon fiber having the above-mentioned average fiber length in the sealing composition of the present invention is blended in an amount of 1% by weight to 10% by weight, preferably 2% by weight to 5% by weight. If the carbon fiber content is less than 1% by weight, the resulting seal for a rotary shaft has a problem of reduced wear resistance. If the carbon fiber content is more than 10% by weight, the resulting rotation is There is a problem that the lubricity of the shaft seal is lowered, the mating member (rotating shaft) is abraded, and the gas easily permeates.
【００１７】上述したような、フッ素樹脂に平均粒径１
０μｍ〜５０μｍのグラファイト粉末を１０重量％〜２
５重量％、平均繊維長５μｍ〜６０μｍのカーボンファ
イバを１重量％〜１０重量％配合してなる本発明の組成
物を成形することで、優れた耐磨耗性およびガスバリア
性を同時に兼ね備える回転軸用シールを得ることができ
る。ここで、本明細書中でいう「優れた耐磨耗性」と
は、ピンオンディスク法により行った磨耗試験により、
測定された磨耗係数が２．０×１０-5ｍｍ／ｓ以下であ
ることをいう。また本明細書中でいう「優れたガスバリ
ア性」とは、ガス漏れ試験を行い、試験前後で質量の減
少がみられないことをいう。As described above, the fluororesin has an average particle size of 1
Graphite powder of 0 μm to 50 μm is added in an amount of 10% by weight to 2
A rotary shaft having excellent abrasion resistance and gas barrier properties at the same time by molding the composition of the present invention in which 5 wt% and carbon fiber having an average fiber length of 5 μm to 60 μm are blended in an amount of 1 wt% to 10 wt%. Can get a seal for. Here, the "excellent wear resistance" in the present specification means that the wear test conducted by the pin-on-disk method
It means that the measured wear coefficient is 2.0 × 10 −5 mm / s or less. The term "excellent gas barrier property" as used in the present specification means that a gas leak test is conducted and no decrease in mass is observed before and after the test.
【００１８】上記の組成物を用いることで、何故、耐磨
耗性およびガスバリア性に優れる回転軸用シールが得ら
れるか、詳細は不明であるが、本発明者は以下のように
考えている。まず、上述した特定範囲の割合にて繊維系
のカーボンファイバを配合したこと、ならびに上記特定
範囲内の平均粒径のカーボンファイバを使用したこと
で、従来より耐磨耗性が格段に向上された回転軸用シー
ルを実現することができるものと考えられる。It is not known in detail why a seal for a rotary shaft having excellent wear resistance and gas barrier properties can be obtained by using the above composition, but the present inventor thinks as follows. . First, by adding a fiber-based carbon fiber in a ratio of the above-mentioned specific range, and by using a carbon fiber having an average particle diameter within the above-mentioned specific range, the abrasion resistance was remarkably improved as compared with the conventional one. It is thought that a seal for a rotating shaft can be realized.
【００１９】また、上記特定範囲内の平均繊維長のカー
ボンファイバを使用したこと、さらに当該カーボンファ
イバおよびグラファイト粉末の配合割合を上記特定範囲
内としたことによって、ガスバリア性の向上された回転
軸用シールが実現できるものと考えられる。なお特開平
２−３８８３２号公報には、ＰＴＦＥに繊維系のカーボ
ンファイバと粒状のグラファイト粉末とを併用して配合
した円板状のシール部材を備える軸封装置が開示されて
いることは上述した。何故、かかる軸封装置におけるシ
ール部材ではガスバリア性が不充分であり、本願発明で
はガスバリア性に優れるのか、その理由はこのカーボン
ファイバの平均繊維長と配合割合にある。特開平２−３
８８３２号公報においては、ＰＴＦＥにグラファイト粉
末を３重量％〜１０重量％、カーボンファイバを３重量
％〜１５重量％配合するものであるが、本発明で規定す
る範囲よりも格段に大きな平均繊維長のカーボンファイ
バが使用されている。本発明の回転軸用シールにおいて
は、平均繊維長を比較的小さく、かつ、その配合割合を
比較的小さくすることで、上記の耐磨耗性を発現させつ
つも、ガスが通過し得るようなパス（すなわち、後述す
る回転軸用シールの厚み方向にガスを透過させるような
通路）を形成しにくく、優れたガスバリア性を発現させ
ることができるものと考えられる。Further, by using a carbon fiber having an average fiber length within the above specified range, and further by setting the blending ratio of the carbon fiber and the graphite powder within the above specified range, for a rotating shaft having an improved gas barrier property. It is thought that a seal can be realized. It has been mentioned above that JP-A-2-38832 discloses a shaft-sealing device including a disk-shaped sealing member in which PTFE is used together with fibrous carbon fibers and granular graphite powder. . The reason why the seal member in such a shaft sealing device has insufficient gas barrier property and the gas barrier property is excellent in the present invention is because of the average fiber length and the compounding ratio of the carbon fiber. Japanese Patent Laid-Open No. 2-3
According to JP-A 8832, 3% by weight to 10% by weight of graphite powder and 3% by weight to 15% by weight of carbon fiber are mixed with PTFE, but the average fiber length is significantly larger than the range specified in the present invention. Carbon fiber is used. In the rotary shaft seal of the present invention, by allowing the average fiber length to be relatively small and the compounding ratio thereof to be relatively small, it is possible to allow gas to pass while exhibiting the above-mentioned abrasion resistance. It is considered that it is difficult to form a path (that is, a passage that allows gas to pass therethrough in the thickness direction of the rotary shaft seal, which will be described later), and excellent gas barrier properties can be exhibited.
【００２０】また、本発明の上記配合によって、フッ素
樹脂中にカーボンファイバおよびグラファイト粉末が略
均一に分散された、換言すれば、分散性に優れた回転軸
用のシールを実現することができる。この良好な分散性
の発現は、上記の如き特定範囲の平均粒径のグラファイ
ト粉末の使用に、特に起因しているものと考えられる。
さらに上記配合で得られた回転軸用シールは、上記特定
範囲の割合にて粒状のグラファイト粉末が配合されてい
るため、潤滑性も良好であり、相手部材（回転軸）の表
面を磨耗させにくいという利点も有する。By the above composition of the present invention, the carbon fiber and the graphite powder are substantially uniformly dispersed in the fluororesin, in other words, it is possible to realize the seal for the rotating shaft which is excellent in dispersibility. It is considered that the manifestation of this good dispersibility is particularly due to the use of the graphite powder having the average particle diameter within the specific range as described above.
Further, since the rotary shaft seal obtained by the above-mentioned compounding contains the granular graphite powder in the ratio of the above-mentioned specific range, the lubricity is also good, and the surface of the mating member (rotating shaft) is not easily worn. It also has the advantage.
【００２１】本発明の組成物は、当分野において通常用
いられているヘンシェルミキサなどの装置を用いて混合
することによって調製できる。さらに、フッ素樹脂の成
形加工に通常用いられている圧縮成形、焼結、ラム成形
などの方法によって、所望の形状の回転軸用シールに成
形することができる。The composition of the present invention can be prepared by mixing using a device such as a Henschel mixer which is commonly used in the art. Further, a rotary shaft seal having a desired shape can be molded by a method such as compression molding, sintering, or ram molding that is usually used for molding fluororesin.
【００２２】本発明の回転軸用シールは、その形状や大
きさに特に制限はなく、フッ素樹脂製の回転軸用シール
としての従来公知の種々の形状で実現される。回転軸用
シールの典型的な例として、回転軸を挿通させるための
貫通孔が中央に形成された円板状物で実現された回転軸
用シールを挙げることができる。このような回転軸用シ
ールにおいて、通常、貫通孔径は回転軸の軸径よりも小
さく形成され、当該貫通孔に回転軸を挿通させると、貫
通孔の周囲部分が、貫通孔を中心として回転軸の挿通方
向に湾曲した形で回転軸に弾発的に当接するようになる
（この湾曲して回転軸に弾発的に当接するように形成さ
れた貫通孔の周囲部分を、「シールリップ部」と呼ぶこ
とがある。）。なお上記円板状で実現された回転軸用シ
ールでは、厚みが０．５ｍｍ〜２ｍｍ程度に形成される
のが通常であるが、本発明の組成物においては、上記平
均繊維長および割合のカーボンファイバが配合されるこ
とによって、上記特開平２−３８８３２号公報に開示さ
れたとは異なり繊維あるいは繊維同士の繋がりによって
上記の如きパスが形成されにくく、非常に有用である。
本発明の回転軸用シールは、このシールリップ部それの
みからなるものであってもよいし、また当該リップシー
ル部をゴム製のリップを組み合わせたり、補強用の金具
に適宜嵌め込んだものであってもよい。The shape and size of the rotary shaft seal of the present invention are not particularly limited, and can be realized in various conventionally known shapes as a rotary shaft seal made of a fluororesin. A typical example of the rotary shaft seal is a rotary shaft seal realized by a disc-shaped object having a through hole for inserting the rotary shaft formed in the center. In such a seal for a rotary shaft, the through hole diameter is usually formed smaller than the shaft diameter of the rotary shaft, and when the rotary shaft is inserted into the through hole, the peripheral portion of the through hole has the rotary shaft centered around the through hole. Is elastically abutted on the rotary shaft in a curved shape in the insertion direction of the seal (the surrounding portion of the through hole formed so as to be curved and elastically abuts on the rotary shaft is referred to as a "seal lip portion"). Sometimes called.). It should be noted that the disk-shaped seal for a rotary shaft is usually formed to have a thickness of about 0.5 mm to 2 mm, but in the composition of the present invention, the carbon having the above average fiber length and ratio is used. By mixing the fibers, unlike the one disclosed in JP-A-2-38832, it is difficult to form the above-mentioned paths due to the fibers or the connection between the fibers, which is very useful.
The seal for the rotating shaft of the present invention may be composed of only this seal lip portion, or the lip seal portion may be combined with a rubber lip or may be appropriately fitted to a metal fitting for reinforcement. It may be.
【００２３】本発明の組成物には、本発明の効果を阻害
しない範囲で、フッ素樹脂に添加され得るような従来公
知の各種の添加物が添加されていてもよい。このような
添加物としては、たとえば、二硫化モリブデン、ガラス
ファイバー、ブロンズ、金属酸化物、耐熱性樹脂などが
挙げられる。To the composition of the present invention, various conventionally known additives that can be added to the fluororesin may be added within a range that does not impair the effects of the present invention. Examples of such additives include molybdenum disulfide, glass fibers, bronze, metal oxides, heat resistant resins and the like.
【００２４】本発明の回転軸用シールにて密封し得る流
体としては、特に制限はなく、フロンガス（フロン１３
４ａなど）、窒素ガス、真空、水、油などが挙げられ、
冷凍機やエアコンディショナ機のコンプレッサ、ポン
プ、ギアポンプなど、特に制限なく適用することができ
る。The fluid that can be sealed with the rotary shaft seal of the present invention is not particularly limited, and is a chlorofluorocarbon (fluorocarbon 13).
4a), nitrogen gas, vacuum, water, oil, etc.,
The invention can be applied to compressors, pumps, gear pumps, etc. of refrigerators and air conditioners without any particular limitation.
【００２５】[0025]
【実施例】以下に実施例を示し、本発明を具体的に説明
するが、本発明は下記の実施例に制限されるものではな
い。実施例１
ＰＴＦＥを８１重量％、平均粒径が２０μｍのグラファ
イト粉末を１２重量％、平均繊維長が７μｍ（アスペク
ト比：０．６）のカーボンファイバを７重量％配合して
なるフッ素樹脂組成物をヘンシェルミキサで攪拌混合
し、金型で加圧成形した後、３７０℃の温度で焼成し
て、回転軸用シールのサンプルを作製した。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples. Example 1 A fluororesin composition obtained by blending 81% by weight of PTFE, 12% by weight of graphite powder having an average particle size of 20 μm, and 7% by weight of carbon fiber having an average fiber length of 7 μm (aspect ratio: 0.6). Was stirred and mixed with a Henschel mixer, pressure-molded with a mold, and then baked at a temperature of 370 ° C. to prepare a sample of a rotary shaft seal.
【００２６】実施例２
ＰＴＦＥを８２重量％、平均粒径が４６μｍのグラファ
イト粉末を１５重量％、平均繊維長が７μｍのカーボン
ファイバを３重量％配合してなるフッ素樹脂組成物を用
いた以外は、実施例１と同様にして回転軸用シールのサ
ンプルを作製した。 Example 2 A fluororesin composition was used except that 82% by weight of PTFE, 15% by weight of graphite powder having an average particle size of 46 μm and 3% by weight of carbon fiber having an average fiber length of 7 μm were used. A sample of the rotary shaft seal was prepared in the same manner as in Example 1.
【００２７】実施例３
ＰＴＦＥを７７重量％、平均粒径が２０μｍのグラファ
イト粉末を２０重量％、平均繊維長が２０μｍ（アスペ
クト比：１．６）のカーボンファイバを３重量％配合し
てなるフッ素樹脂組成物を用いた以外は、実施例１と同
様にして回転軸用シールのサンプルを作製した。 Example 3 Fluorine containing 77% by weight of PTFE, 20% by weight of graphite powder having an average particle size of 20 μm, and 3% by weight of carbon fiber having an average fiber length of 20 μm (aspect ratio: 1.6). A rotary shaft seal sample was prepared in the same manner as in Example 1 except that the resin composition was used.
【００２８】実施例４
ＰＴＦＥを８２重量％、平均粒径が２０μｍのグラファ
イト粉末を１５重量％、平均繊維長が５０μｍ（アスペ
クト比：５．６）のカーボンファイバを３重量％配合し
てなるフッ素樹脂組成物を用いた以外は、実施例１と同
様にして回転軸用シールのサンプルを作製した。 Example 4 Fluorine containing 82% by weight of PTFE, 15% by weight of graphite powder having an average particle size of 20 μm, and 3% by weight of carbon fiber having an average fiber length of 50 μm (aspect ratio: 5.6). A rotary shaft seal sample was prepared in the same manner as in Example 1 except that the resin composition was used.
【００２９】比較例１
ＰＴＦＥを８２重量％、平均粒径が８０μｍのグラファ
イト粉末を１５重量％、平均繊維長が７μｍのカーボン
ファイバを３重量％配合してなるフッ素樹脂組成物を用
いた以外は、実施例１と同様にして回転軸用シールのサ
ンプルを作製した。 Comparative Example 1 Except that a fluororesin composition was used, in which 82 wt% PTFE, 15 wt% graphite powder having an average particle size of 80 μm and 3 wt% carbon fiber having an average fiber length of 7 μm were used. A sample of the rotary shaft seal was prepared in the same manner as in Example 1.
【００３０】比較例２
ＰＴＦＥを８２重量％、平均粒径が２０μｍのグラファ
イト粉末を１５重量％、平均繊維長が１３０μｍ（アス
ペクト比：１０．４）のカーボンファイバを３重量％配
合してなるフッ素樹脂組成物を用いた以外は、実施例１
と同様にして回転軸用シールのサンプルを作製した。 Comparative Example 2 Fluorine containing 82% by weight of PTFE, 15% by weight of graphite powder having an average particle size of 20 μm, and 3% by weight of carbon fiber having an average fiber length of 130 μm (aspect ratio: 10.4). Example 1 except that the resin composition was used
A sample of a seal for a rotating shaft was prepared in the same manner as in.
【００３１】比較例３
ＰＴＦＥを８０重量％、平均粒径が２０μｍのグラファ
イト粉末を２０重量％配合してなるフッ素樹脂組成物を
用いた以外は、実施例１と同様にして回転軸用シールの
サンプルを作製した。 Comparative Example 3 A rotary shaft seal was prepared in the same manner as in Example 1 except that a fluororesin composition containing 80% by weight of PTFE and 20% by weight of graphite powder having an average particle size of 20 μm was used. A sample was prepared.
【００３２】比較例４
ＰＴＦＥを７５重量％、平均粒径が２０μｍのグラファ
イト粉末を２５重量％配合してなるフッ素樹脂組成物を
用いた以外は、実施例１と同様にして回転軸用シールの
サンプルを作製した。 Comparative Example 4 A rotary shaft seal was prepared in the same manner as in Example 1 except that a fluororesin composition containing 75% by weight of PTFE and 25% by weight of graphite powder having an average particle size of 20 μm was used. A sample was prepared.
【００３３】比較例５
ＰＴＦＥを９７重量％、平均繊維長が２０μｍ（アスペ
クト比：１．６）のカーボンファイバを３重量％配合し
てなるフッ素樹脂組成物を用いた以外は、実施例１と同
様にして回転軸用シールのサンプルを作製した。 Comparative Example 5 Example 1 was repeated except that a fluororesin composition prepared by mixing 97% by weight of PTFE and 3% by weight of carbon fiber having an average fiber length of 20 μm (aspect ratio: 1.6) was used. Similarly, a sample of a rotary shaft seal was prepared.
【００３４】比較例６
ＰＴＦＥを８２重量％、平均粒径が５μｍのグラファイ
ト粉末を１５重量％、平均繊維長が２０μｍ（アスペク
ト比：１．６）のカーボンファイバを３重量％配合して
なるフッ素樹脂組成物を用いた以外は、実施例１と同様
にして回転軸用シールのサンプルを作製した。 Comparative Example 6 Fluorine containing 82% by weight of PTFE, 15% by weight of graphite powder having an average particle size of 5 μm, and 3% by weight of carbon fiber having an average fiber length of 20 μm (aspect ratio: 1.6). A rotary shaft seal sample was prepared in the same manner as in Example 1 except that the resin composition was used.
【００３５】比較例７
ＰＴＦＥを９２重量％、平均粒径が４６μｍのグラファ
イト粉末を５重量％、平均繊維長が２０μｍ（アスペク
ト比：１．６）のカーボンファイバを３重量％配合して
なるフッ素樹脂組成物を用いた以外は、実施例１と同様
にして回転軸用シールのサンプルを作製した。 Comparative Example 7 Fluorine prepared by mixing 92% by weight of PTFE, 5% by weight of graphite powder having an average particle diameter of 46 μm, and 3% by weight of carbon fiber having an average fiber length of 20 μm (aspect ratio: 1.6). A rotary shaft seal sample was prepared in the same manner as in Example 1 except that the resin composition was used.
【００３６】比較例８
ＰＴＦＥを７０重量％、平均粒径が４６μｍのグラファ
イト粉末を３０重量％配合してなるフッ素樹脂組成物を
用いた以外は、実施例１と同様にして回転軸用シールの
サンプルを作製した。 Comparative Example 8 A rotary shaft seal was prepared in the same manner as in Example 1 except that a fluororesin composition containing 70% by weight of PTFE and 30% by weight of graphite powder having an average particle size of 46 μm was used. A sample was prepared.
【００３７】比較例９
ＰＴＦＥを８４．５重量％、平均粒径が２０μｍのグラ
ファイト粉末を１５重量％、平均繊維長が２０μｍ（ア
スペクト比：１．６）のカーボンファイバを０．５重量
％配合してなるフッ素樹脂組成物を用いた以外は、実施
例１と同様にして回転軸用シールのサンプルを作製し
た。 Comparative Example 9 84.5% by weight of PTFE, 15% by weight of graphite powder having an average particle size of 20 μm, and 0.5% by weight of carbon fiber having an average fiber length of 20 μm (aspect ratio: 1.6) A rotary shaft seal sample was prepared in the same manner as in Example 1 except that the fluororesin composition prepared as above was used.
【００３８】比較例１０
ＰＴＦＥを８５重量％、平均繊維長が２０μｍ（アスペ
クト比：１．６）のカーボンファイバを１５重量％配合
してなるフッ素樹脂組成物を用いた以外は、実施例１と
同様にして回転軸用シールのサンプルを作製した。COMPARATIVE EXAMPLE 10 Example 1 was repeated except that a fluororesin composition containing 85% by weight of PTFE and 15% by weight of carbon fiber having an average fiber length of 20 μm (aspect ratio: 1.6) was used. Similarly, a sample of a rotary shaft seal was prepared.
【００３９】比較例１１
ＰＴＦＥを７０重量％、平均粒径が４６μｍのグラファ
イト粉末を１５重量％、平均繊維長が２０μｍ（アスペ
クト比：１．６）のカーボンファイバを１５重量％配合
してなるフッ素樹脂組成物を用いた以外は、実施例１と
同様にして回転軸用シールのサンプルを作製した。 Comparative Example 11 Fluorine prepared by mixing 70% by weight of PTFE, 15% by weight of graphite powder having an average particle size of 46 μm, and 15% by weight of carbon fiber having an average fiber length of 20 μm (aspect ratio: 1.6). A rotary shaft seal sample was prepared in the same manner as in Example 1 except that the resin composition was used.
【００４０】〔評価試験〕（１）磨耗試験
実施例１〜４および比較例１〜１１の各サンプルから、
切削加工によって径が５ｍｍ、長さが１２ｍｍの円柱ピ
ン状の試料をそれぞれ作製し、ピンオンディスク法によ
って各試料について磨耗試験を行い、時間あたりの磨耗
量から磨耗係数（×１０-5ｍｍ／ｓ）を算出した。磨耗
試験は、以下の条件で行った。
・圧力：２ＭＰａ
・速度：５ｍ／ｓ
・温度：１３０℃
・相手材：Ｓ４５Ｃディスク[Evaluation Test] (1) Abrasion Test From the samples of Examples 1 to 4 and Comparative Examples 1 to 11,
Cylindrical pin-shaped samples with a diameter of 5 mm and a length of 12 mm were prepared by cutting, and a wear test was performed on each sample by the pin-on-disk method. From the amount of wear per hour, the wear coefficient (× 10 −5 mm / s) was calculated. The abrasion test was performed under the following conditions.・ Pressure: 2 MPa ・ Velocity: 5 m / s ・ Temperature: 130 ° C ・ Mating material: S45C disc
【００４１】（２）ガス漏れ試験
実施例１〜４および比較例１〜１１の各サンプルから、
切削加工によって径が３０ｍｍ、長さが１ｍｍの円板状
の試料をそれぞれ作製し、ステンレスチューブ（容量：
４００ｃｃ）にＨＣＦＣ１３４ａを２００ｇ入れ、上記
試料で密封した後、９０℃で４時間加熱を行い、加熱前
後での質量の減少の有無をみた。質量の減少がみられな
かったものを○、質量の減少がみられたものを×と評価
した。 (2) Gas Leakage Test From each sample of Examples 1 to 4 and Comparative Examples 1 to 11,
A disk-shaped sample having a diameter of 30 mm and a length of 1 mm was prepared by cutting, and a stainless steel tube (capacity:
After putting 200 g of HCFC134a in 400 cc) and sealing with the above sample, heating was performed at 90 ° C. for 4 hours, and it was checked whether or not there was a decrease in mass before and after heating. The case where the decrease in mass was not observed was evaluated as ◯, and the case where the decrease in mass was observed was evaluated as ×.
【００４２】（３）分散性の評価
実施例１〜４および比較例１〜１１の各サンプルから、
切削加工によって厚み１．０ｍｍの試験片を作製し、こ
れらを光学顕微鏡を使用して拡大観察することで、分散
性の評価を行った。拡大観察によって均一に分散されて
いたものを○、０．３ｍｍ以上の充填材の凝集のあった
ものを×とした。上記（１）〜（３）の結果を、表１、
表２に示す。 (3) Evaluation of Dispersibility From each sample of Examples 1 to 4 and Comparative Examples 1 to 11,
A 1.0 mm-thick test piece was produced by cutting, and the dispersibility was evaluated by magnifying and observing these using an optical microscope. What was uniformly dispersed by magnifying observation was marked with ◯, and when there was aggregation of the filler of 0.3 mm or more, it was marked with x. The results of (1) to (3) above are shown in Table 1.
It shows in Table 2.
【００４３】[0043]
【表１】 [Table 1]
【００４４】[0044]
【表２】 [Table 2]
【００４５】[0045]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、耐磨耗性およびガスバリア性に優れる回転軸用
シールを形成し得るシール用組成物を提供することがで
きる。As is apparent from the above description, according to the present invention, it is possible to provide a sealing composition capable of forming a rotary shaft seal having excellent wear resistance and gas barrier properties.
Claims (3)
μｍのグラファイト粉末を１０重量％〜２５重量％、平
均繊維長５μｍ〜６０μｍのカーボンファイバを１重量
％〜１０重量％配合してなる、シール用組成物。1. A fluororesin having an average particle size of 10 μm to 50 μm.
A sealing composition comprising 10% by weight to 25% by weight of graphite powder having a particle diameter of 5 μm and 1% by weight to 10% by weight of carbon fiber having an average fiber length of 5 μm to 60 μm.
レンである請求項１に記載のシール用組成物。2. The sealing composition according to claim 1, wherein the fluororesin is polytetrafluoroethylene.
したものである回転軸用シール。3. A rotary shaft seal formed by molding the composition according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002019722A JP3733074B2 (en) | 2002-01-29 | 2002-01-29 | Rotating shaft seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002019722A JP3733074B2 (en) | 2002-01-29 | 2002-01-29 | Rotating shaft seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003213063A true JP2003213063A (en) | 2003-07-30 |
| JP3733074B2 JP3733074B2 (en) | 2006-01-11 |
Family
ID=27654282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002019722A Expired - Lifetime JP3733074B2 (en) | 2002-01-29 | 2002-01-29 | Rotating shaft seal |
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| JP (1) | JP3733074B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005281446A (en) * | 2004-03-29 | 2005-10-13 | Mitsubishi Cable Ind Ltd | Tetrafluoroethylene resin composition and sliding member produced by using the same |
| WO2020111491A1 (en) * | 2018-11-30 | 2020-06-04 | 주식회사 포스코 | Composition for sealing member of apparatus for continuously passing steel plate, and apparatus for continuously passing steel plate comprising same |
| US20210206946A1 (en) * | 2018-05-22 | 2021-07-08 | Daikin Industries, Ltd. | Polytetrafluoroethylene composition |
| CN114163816A (en) * | 2021-12-31 | 2022-03-11 | 金发科技股份有限公司 | Wear-resistant reinforced PPS composition and preparation method and application thereof |
-
2002
- 2002-01-29 JP JP2002019722A patent/JP3733074B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005281446A (en) * | 2004-03-29 | 2005-10-13 | Mitsubishi Cable Ind Ltd | Tetrafluoroethylene resin composition and sliding member produced by using the same |
| US20210206946A1 (en) * | 2018-05-22 | 2021-07-08 | Daikin Industries, Ltd. | Polytetrafluoroethylene composition |
| WO2020111491A1 (en) * | 2018-11-30 | 2020-06-04 | 주식회사 포스코 | Composition for sealing member of apparatus for continuously passing steel plate, and apparatus for continuously passing steel plate comprising same |
| CN114163816A (en) * | 2021-12-31 | 2022-03-11 | 金发科技股份有限公司 | Wear-resistant reinforced PPS composition and preparation method and application thereof |
| CN114163816B (en) * | 2021-12-31 | 2023-08-29 | 金发科技股份有限公司 | Wear-resistant reinforced PPS composition and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3733074B2 (en) | 2006-01-11 |
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