JP2007070537A - Thermoplastic resin composition - Google Patents

Thermoplastic resin composition Download PDF

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JP2007070537A
JP2007070537A JP2005260911A JP2005260911A JP2007070537A JP 2007070537 A JP2007070537 A JP 2007070537A JP 2005260911 A JP2005260911 A JP 2005260911A JP 2005260911 A JP2005260911 A JP 2005260911A JP 2007070537 A JP2007070537 A JP 2007070537A
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ptfe
mass
thermoplastic resin
resin composition
molecular weight
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Mitsugi Ota
貢 太田
Yoshihito Kizara
嘉仁 木皿
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Unitika Ltd
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Unitika Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition which provides good productivity and continuous productivity in molding and gives a molding capable of having excellent sliding properties and mechanical properties such as impact resistance and suitable as a sliding member. <P>SOLUTION: The thermoplastic resin composition comprises (A) 50 to 75 mass% polytetrafluoroethylene of a number-average molecular weight of 10,000,000 to 20,000,000 and an average particle diameter of 50 to 200 μm, (B) 50 to 25 mass% polytetrafluoroethylene of a number-average molecular weight of 10,000 to 200,000 and an average particle diameter of 3 to 35 μm, and (C) 95 to 60 mass%, based on the total weight of (A) and (B) of 5-40 mass%, polyamide resin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、摺動部材用として好適な成形材料に関するものであり、さらに詳しくは、ポリアミド樹脂に特定の数平均分子量と平均粒径を有する2種のポリテトラフルオロエチレン(以下、PTFEと略称することがある。)粉末を分散させた熱可塑性樹脂組成物に関するものである。   The present invention relates to a molding material suitable for a sliding member. More specifically, the present invention relates to two types of polytetrafluoroethylene (hereinafter abbreviated as PTFE) having a specific number average molecular weight and average particle size in a polyamide resin. The present invention relates to a thermoplastic resin composition in which powder is dispersed.

熱可塑性樹脂を用いた摺動部材は、コストパフォーマンスに優れ、良好な機械的特性と成形性などを有するため広く用いられていが、単独で摺動部材として用いるには必ずしも充分な特性を有するとはいえない。
熱可塑性樹脂を用いた摺動部材の摩擦特性や摩耗特性を改良するため、二硫化モリブデン、PTFE、黒鉛などのいわゆる固体潤滑剤の粉末、及び必要により炭素繊維、ガラス繊維などの強化用繊維を配合したり、あるいは液状シリコーンなどを含浸させた含油タイプの成形材料の開発が行われてきた。
A sliding member using a thermoplastic resin is widely used because it has excellent cost performance and good mechanical properties and moldability, but has sufficient characteristics to be used alone as a sliding member. I can't say that.
In order to improve the friction and wear characteristics of sliding members using thermoplastic resin, so-called solid lubricant powders such as molybdenum disulfide, PTFE, and graphite, and reinforcing fibers such as carbon fibers and glass fibers, if necessary, are used. Oil-containing molding materials that have been blended or impregnated with liquid silicone have been developed.

しかし、熱可塑性樹脂の場合、高速かつ高荷重という使用条件下では、溶融により摺動特性、特に限界PV値は決して満足できる値ではない。また、特に含油タイプでは汚れ、ブリードが生じるので好ましくない。     However, in the case of a thermoplastic resin, under the use conditions of high speed and high load, the sliding characteristics, particularly the limit PV value, are never satisfactory due to melting. In particular, the oil-impregnated type is not preferable because dirt and bleeding occur.

このため、従来より摺動部材用樹脂組成物の添加剤として、PTFE粉を利用する試みもなされている。     For this reason, the trial which utilizes PTFE powder as an additive of the resin composition for sliding members conventionally is also made | formed.

しかし、添加用のPTFEとして高分子量のものを用いると、溶融混練時にフィブリル化により分散不良が生じたり、溶融粘度が高くなり成形性が低下するという問題があり、また、平均粒径が大きいものを用いると、溶融混練時にサージング(脈動)を起こして生産性が低下するという問題があり、樹脂組成物に用いるPTFEは平均分子量1000万以下(特に30万以下)のものを添加するというのが常套手段であった。また、このPTFEを40質量%以上添加し、摩擦特性と耐摩耗性を改良する提案もなされている(特許文献1参照)が、この組成物を用いたものでも、機械的特性や摩擦特性において、なお充分なものとはいえない。     However, when a high molecular weight PTFE is used as the additive PTFE, there is a problem in that poor dispersion occurs due to fibrillation during melt-kneading, or the melt viscosity increases and the moldability decreases, and the average particle size is large. Is used, there is a problem that surging (pulsation) occurs during melt-kneading and productivity is lowered, and PTFE used for the resin composition has an average molecular weight of 10 million or less (particularly 300,000 or less). It was a conventional means. In addition, there is a proposal to improve the friction characteristics and wear resistance by adding 40% by mass or more of this PTFE (see Patent Document 1). However, even in the case of using this composition, the mechanical characteristics and the friction characteristics are improved. Still, not enough.

一方、成形用のPTFEは、数平均分子量1000万以上の高分子量のものが微粒子や粉末の形態で市販され、耐熱性、耐寒性、難燃性、摺動性、非粘着性、防汚性、耐薬品性、耐候性、電気特性などの特徴を活かして利用されている。しかし、PTFE単独や、PTFEに補助充填剤を加えた摺動部材の場合、通常、加工生産性の低い圧縮成形で成形され、また、寸法安定性や耐クリープ性が不充分であるため、生産性並びに前記特性の両方に対して改善の要望がある。
特開昭63−251448号公報
On the other hand, high-molecular weight PTFE having a number average molecular weight of 10 million or more is commercially available in the form of fine particles or powder, and heat resistance, cold resistance, flame resistance, slidability, non-adhesiveness, and antifouling properties It is used by taking advantage of its characteristics such as chemical resistance, weather resistance and electrical characteristics. However, in the case of PTFE alone or a sliding member obtained by adding an auxiliary filler to PTFE, it is usually formed by compression molding with low processing productivity, and dimensional stability and creep resistance are insufficient. There is a need for improvement in both properties and the above properties.
JP-A-63-251448

本発明は、上記の問題を解決し、単に良好な分散性や成形性だけでなく、生産性がよくて連続生産が容易であり、しかも得られる成形品に優れた摺動特性、耐衝撃性などの機械的特性を付与することが可能であり、摺動部材用として好適な熱可塑性樹脂組成物を提供することを技術的な課題とするものである。   The present invention solves the above-mentioned problems, not only good dispersibility and moldability, but also has good productivity and easy continuous production, and the resulting molded product has excellent sliding characteristics and impact resistance. It is an object of the present invention to provide a thermoplastic resin composition that is suitable for a sliding member.

本発明者らは、上記の課題を解決するために、特定の分子量と粒径を有するPTFEをポリアミド樹脂に一定量の割合で配合し、成形性と摺動特性の改良を試みた。これらPTFEの添加により、従来技術に比べて成形性と摺動特性の向上は認められたものの、わずかにフィブリル化による分散不良とサージングが発生し、連続生産性に関しては、必ずしも良好とはいえなかった。本発明は、上記知見に基づき、さらに鋭意研究の結果、分子量と粒径の異なる2種のPTFEを組み合わせることで、成形品の摺動特性を損なうことなく連続生産性を向上させることができることを見出し、本発明に到達した。 In order to solve the above-mentioned problems, the present inventors tried to improve moldability and sliding characteristics by blending PTFE having a specific molecular weight and particle size in a polyamide resin at a constant ratio. Although the addition of PTFE has improved moldability and sliding properties compared to the prior art, slight dispersion failure and surging occur due to fibrillation, and continuous productivity is not necessarily good. It was. The present invention is based on the above findings, and as a result of further earnest research, by combining two types of PTFE having different molecular weights and particle sizes, it is possible to improve continuous productivity without impairing the sliding properties of the molded product. The headline, the present invention has been reached.

すなわち、本発明は、(A)数平均分子量1000万〜2000万、平均粒径50〜200μmであるポリテトラフルオロエチレン50〜75質量%、(B)数平均分子量1万〜20万、平均粒径3〜35μmであるポリテトラフルオロエチレン50〜25質量%、(C)前記(A)及び(B)成分の合計量5〜40質量%に対して95〜60質量%のポリアミド樹脂からなる熱可塑性樹脂組成物を要旨とするものである。   That is, the present invention comprises (A) 50-75% by mass of polytetrafluoroethylene having a number average molecular weight of 10 million to 20 million and an average particle diameter of 50 to 200 μm, and (B) number average molecular weight of 10,000 to 200,000, average particle Heat comprising 95 to 60% by mass of polyamide resin with respect to 50 to 25% by mass of polytetrafluoroethylene having a diameter of 3 to 35 μm and (C) 5 to 40% by mass of the total amount of the components (A) and (B). The gist of the present invention is a plastic resin composition.

本発明の熱可塑性樹脂組成物を用いて成形すれば、生産性がよくて連続生産が容易であり、また、得られる成形品は機械的特性とともに特に摺動特性が優れており、摺動部材、例えば自動車、産業機器分野の軸受、ガイド部材、チェーン、歯車、摺動シール材のような良好な機械的特性と摩擦摩耗特性が要求される摺動部材として好適な成形品を得ること
が可能となり、産業上の利用価値は極めて高い。
If the thermoplastic resin composition of the present invention is molded, the productivity is good and the continuous production is easy, and the obtained molded product has excellent sliding characteristics as well as mechanical characteristics. It is possible to obtain molded products suitable as sliding members that require good mechanical properties and friction and wear properties, such as bearings, guide members, chains, gears, and sliding seals in the automotive and industrial equipment fields. The industrial utility value is extremely high.

以下、本発明について詳細に説明する。
本発明の熱可塑性樹脂組成物は、マトリックスとなるポリアミド樹脂と、数平均分子量と平均粒径の異なる2種のPTFEとで形成されているが、まず、PTFEについて説明する。
本発明で用いるPTFEは、数平均分子量が1000万〜2000万、平均粒径が50〜200μmのもの(PTFE―A)と、数平均分子量が1万〜20万、平均粒径が3〜35μmのもの(PTFE―B)である。
上記のようなPTFE粉末は、乳化重合法又は懸濁重合法により得ることができ、重合により得られたPTFE粉末を、乾燥後粉砕機にて50〜200μm、あるいは3〜35μmの粒径に微粉砕して得ることができる。
なお、本発明で用いるPTFEは、1質量%未満の割合で共重合されたPTFEを含む。共重合成分としては、たとえばヘキサフルオロプロピレン、パーフルオロアルキルエーテル、パーフルオロアルキル(炭素数1〜10)エチレン、パーフルオロアルキル(炭素数1〜10)アリルエーテル、及び式:CF2 =CF[OCF3 CFX(CF2)m ]n OCF2 (CF2 )p Y[式中、Xはフッ素原子又はトリフルオロメチル基、Yはハロゲン原子、mは0又は1(ただし、mが1の場合、Xはフッ素原子である)、nは0又は1〜5の整数、pは1又は2を表わす]で示される化合物が挙げられる。
Hereinafter, the present invention will be described in detail.
The thermoplastic resin composition of the present invention is formed of a polyamide resin as a matrix and two types of PTFE having different number average molecular weights and average particle diameters. First, PTFE will be described.
PTFE used in the present invention has a number average molecular weight of 10 to 20 million and an average particle diameter of 50 to 200 μm (PTFE-A), a number average molecular weight of 10,000 to 200,000 and an average particle diameter of 3 to 35 μm. (PTFE-B).
The PTFE powder as described above can be obtained by an emulsion polymerization method or a suspension polymerization method. After drying, the PTFE powder obtained by polymerization is finely reduced to a particle size of 50 to 200 μm or 3 to 35 μm with a pulverizer. It can be obtained by grinding.
In addition, PTFE used by this invention contains PTFE copolymerized in the ratio of less than 1 mass%. Examples of the copolymer component include hexafluoropropylene, perfluoroalkyl ether, perfluoroalkyl (carbon number 1 to 10) ethylene, perfluoroalkyl (carbon number 1 to 10) allyl ether, and the formula: CF 2 = CF [OCF 3 CFX (CF 2 ) m] n OCF 2 (CF 2 ) p Y [wherein X is a fluorine atom or trifluoromethyl group, Y is a halogen atom, m is 0 or 1 (provided that m is 1; X is a fluorine atom), n is 0 or an integer of 1 to 5, and p is 1 or 2.].

また、本発明の熱可塑性樹脂組成物において用いられるポリアミド樹脂としては、アミノ酸、ラクタムあるいはジアミンとジカルボン酸(それらの一対の塩も含まれる)とから形成されるアミド結合を有する重合体である。このようなポリアミド樹脂の例としては、ポリカプラミド(ナイロン6)、ポリテトラメチレンアジパミド (ナイロン46)、ポリヘキサメチレンアジパミド(ナイロン66)、ポリヘキサメチレンセバカミド(ナイロン 610)、ポリヘキサメチレンドデカミド(ナイロン 612)、ポリウンデカメチレンアジパミド(ナイロン 116)、ポリウンデカミド(ナイロン11)、ポリドデカミド(ナイロン12)、ポリトリメチルヘキサメチレンテレフタルアミド(ナイロンTMDT)、ポリヘキサメチレンイソフタルアミド(ナイロン6I)、ポリヘキサメチレンテレフタル/イソフタルアミド(ナイロン6T/6I)、ポリビス(4−アミノシクロヘキシル)メタンドデカミド(ナイロンPACM12)、ポリビス(3−メチル−4−アミノシクロヘキシル)メタンドデカミド(ナイロンジメチルPACM12)、ポリメタキシリレンアジパミド(ナイロンMXD6)、ポリノナメチレンテレフタルアミド(ナイロン9T)、ポリウンデカメチレンテレフタルアミド(ナイロン 11T)、ポリウンデカメチレンヘキサヒドロテレフタルアミド〔ナイロン11T(H)〕又はこれらの共重合ポリアミド、混合ポリアミドなどが挙げられ、中でもナイロン6又はこれらの共重合ポリアミド、ナイロン66又はこれらの共重合ポリアミドが好ましく、ナイロン6及びナイロン66が最適である。     The polyamide resin used in the thermoplastic resin composition of the present invention is a polymer having an amide bond formed from an amino acid, lactam or diamine and a dicarboxylic acid (including a pair of salts thereof). Examples of such polyamide resins include polycapramide (nylon 6), polytetramethylene adipamide (nylon 46), polyhexamethylene adipamide (nylon 66), polyhexamethylene sebacamide (nylon 610), poly Hexamethylene dodecamide (nylon 612), polyundecamethylene adipamide (nylon 116), polyundecamide (nylon 11), polydodecamide (nylon 12), polytrimethylhexamethylene terephthalamide (nylon TMDT), polyhexamethylene isophthalamide ( Nylon 6I), polyhexamethylene terephthalate / isophthalamide (nylon 6T / 6I), polybis (4-aminocyclohexyl) methane dodecamide (nylon PACM12), polybis (3-methyl- -Aminocyclohexyl) methane dodecamide (nylon dimethyl PACM12), polymetaxylylene adipamide (nylon MXD6), polynonamethylene terephthalamide (nylon 9T), polyundecamethylene terephthalamide (nylon 11T), polyundecamethylene hexa Hydroterephthalamide [Nylon 11T (H)] or a copolymerized polyamide thereof, a mixed polyamide or the like can be mentioned, among which nylon 6 or a copolymerized polyamide thereof, nylon 66 or a copolymerized polyamide thereof is preferable, and nylon 6 and nylon 66 Is the best.

本発明の熱可塑性樹脂組成物におけるPTFE―AとPTFE―Bの割合は、PTFE―Aが50〜75質量%に対してPTFE―Bが50〜25質量%の範囲とすることが必要である。     The ratio of PTFE-A and PTFE-B in the thermoplastic resin composition of the present invention needs to be in the range of 50-25% by mass of PTFE-B with respect to 50-75% by mass of PTFE-A. .

PTFE―Aの含有量が50質量%未満になると所望の摺動特性が得られず、75質量%を超えると、溶融混練時にフィブリル化により分散不良が生じたり、溶融粘度が高くなり成形性が低下する。     When the content of PTFE-A is less than 50% by mass, desired sliding characteristics cannot be obtained. When the content exceeds 75% by mass, poor dispersion occurs due to fibrillation during melt kneading, and the melt viscosity becomes high and the moldability becomes high. descend.

また、本発明の熱可塑性樹脂組成物における前記各成分の配合割合は、PTFE―AとPTFE―Bの合計量5〜40質量%と、ポリアミド樹脂95〜60質量%である。PTFE―AとPTFE―Bの合計量が5重量%未満になると所望の摺動特性が得られず、40重量%を超えると溶融混練時にサージングを起こし、あるいは著しく流動性が低下して溶融成形性が損なわれる。     The blending ratio of each component in the thermoplastic resin composition of the present invention is 5 to 40% by mass of the total amount of PTFE-A and PTFE-B and 95 to 60% by mass of the polyamide resin. If the total amount of PTFE-A and PTFE-B is less than 5% by weight, desired sliding characteristics cannot be obtained, and if it exceeds 40% by weight, surging occurs during melt-kneading, or the fluidity is remarkably lowered and melt molding is performed. Sexuality is impaired.

また、成形品の摺動性と機械的強度、成形性を両立させる点から、PTFE―AとPTFE―Bの合計量10〜30質量%に対してポリアミド樹脂が90〜70質量%とするのがさらに好ましい。     Moreover, from the point which balances the slidability of a molded article, mechanical strength, and a moldability, a polyamide resin shall be 90-70 mass% with respect to the total amount 10-30 mass% of PTFE-A and PTFE-B. Is more preferable.

なお、本発明の熱可塑性樹脂組成物中には、その特性を大きく損なわない範囲で、顔料、離型剤、熱安定剤、酸化防止剤、難燃剤、可塑剤などを添加することができる。   In addition, a pigment, a mold release agent, a heat stabilizer, an antioxidant, a flame retardant, a plasticizer, and the like can be added to the thermoplastic resin composition of the present invention as long as the characteristics are not significantly impaired.

本発明の熱可塑性樹脂組成物の調製には、公知の混合方法が適用できる。たとえば、タンブラー、V型ブレンダー、ナウターミキサー、バンバリーミキサー、混練ロール、押出機などの混練機により混合して製造することができ、より好ましくは押出機、特に2軸押出機により溶融混練して組成物を製造することである。     A known mixing method can be applied to the preparation of the thermoplastic resin composition of the present invention. For example, it can be produced by mixing with a kneader such as a tumbler, V-type blender, Nauta mixer, Banbury mixer, kneading roll, or extruder, and more preferably melt-kneaded with an extruder, particularly a twin-screw extruder. It is to produce a composition.

このようにして得られる熱可塑性樹脂組成物のペレットは、通常用いられる熱可塑性樹脂を成形する機械、たとえば射出成形機、圧縮成形機、押出成形機などによって所望形状の成形物、たとえばシート状、パイプ状、板状などに成形することができる。また、補強のため、本発明で用いられた熱可塑性樹脂やそれ以外の樹脂を積層することも可能である。     The pellets of the thermoplastic resin composition thus obtained are molded into a desired shape, such as a sheet, by a machine that molds a commonly used thermoplastic resin, such as an injection molding machine, a compression molding machine, or an extrusion molding machine. It can be formed into a pipe shape, a plate shape, or the like. For reinforcement, the thermoplastic resin used in the present invention or other resins can be laminated.

本発明の、ポリアミド樹脂をマトリックスとして用いた熱可塑性樹脂組成物を成形すれば、ポリアミド樹脂が本来有する機械的特性や成形性などと、PTFEが本来有する摺動特性、耐熱性、耐寒性、難燃性、非粘着性、耐薬品性、耐候性、電気的特性、表面特性などを兼ね備えた成形品を得ることができるのにとどまらず、数平均分子量と平均粒径を特定した2種のPTFEを配合することにより、成形時の連続生産性や成形品の機械的特性を相乗的に向上させることができる。     If the thermoplastic resin composition using the polyamide resin as a matrix of the present invention is molded, the mechanical properties and moldability inherent in the polyamide resin, the sliding properties inherent in PTFE, heat resistance, cold resistance, difficulty, etc. Not only can we obtain molded products that combine flammability, non-adhesiveness, chemical resistance, weather resistance, electrical properties, surface properties, etc., but two types of PTFE that specify number average molecular weight and average particle size By blending, it is possible to synergistically improve the continuous productivity during molding and the mechanical properties of the molded product.

このため、本発明の熱可塑性樹脂組成物は、成形性、機械的特性だけでなく特に摺動特性の優れた摺動部材、たとえば自動車、産業機器分野の軸受、ガイド部材(ローラー、すべり板)、チェーン、歯車(ギア、スクリュー)、摺動シール材などの摺動部材の成形用として好適なものである。
For this reason, the thermoplastic resin composition of the present invention is a sliding member having not only moldability and mechanical properties but also particularly excellent sliding properties, for example, bearings and guide members (rollers and sliding plates) in the field of automobiles and industrial equipment. It is suitable for molding sliding members such as chains, gears (gears, screws), and sliding sealing materials.

次に、本発明を実施例により具体的に説明するが、本発明は実施例のみに限定されるものではない。なお、実施例で用いた原料、及び物性試験の測定法は次の通りである。
1.原料
(1)ポリアミド樹脂〔商品名:A1030BRL、ユニチカ社製〕
(2)PTFE−A:三幸ファインマテリアル社製 エースフロン SK45(分子量 1500万 平均粒径200μm)
(3)PTFE-B1:三幸ファインマテリアル社製 エースフロン SK3(分子量 3万 平均粒径3μm)
(4)PTFE-B2:三幸ファインマテリアル社製 エースフロン SG―1000(分子量 15万 平均粒径32μm)
2.測定法
(a)曲げ強度:ASTM D790に準拠して測定した。75MPa以上が好ましい。
(b)曲げ弾性率:ASTM D790に準拠して測定した。2.0GPa以上が好ましい。
(c)衝撃強さ:ASTM D256に準拠して測定した。45J/m以上が好ましい。
(d)摩擦係数:樹脂組成物を用いて、外径25.6mm、内径20mm、厚み15mmの円筒形の試験片を作製した。次いで、鈴木式摩擦摩耗試験機(東洋測器社製 C-M型)の摩擦力検出器を用いて、荷重40kgf/cmの条件で、1時間後の摩擦係数を測定した。摩擦係数は0.25以下が好ましい。
(e)連続生産性:溶融混練押出時、10kg生産する間にフィブリル化による分散不良とサイジングが発生しなかった場合を○、フィブリル化による分散不良とサージングが発生した場合を×と評価した。

(実施例1)
まず、PTFE―A 50質量%とPTFE―B1 50質量%を予備混合した。次に、このPTFE混合粉末10質量%とポリアミド樹脂90質量%とを二軸押出機(東芝機械社製、TEM37−BS)にて樹脂温度260℃で溶融混練押出し、ペレット化した。
EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited only to an Example. In addition, the raw material used in the Example and the measuring method of a physical property test are as follows.
1. Raw material (1) Polyamide resin [Brand name: A1030BRL, manufactured by Unitika Ltd.]
(2) PTFE-A: Ace Flon SK45 (molecular weight: 15 million, average particle size: 200 μm) manufactured by Sanko Fine Materials
(3) PTFE-B1: Ace Flon SK3 (molecular weight 30,000 average particle size 3 μm) manufactured by Sanko Fine Materials
(4) PTFE-B2: Ace Flon SG-1000 (Molecular weight 150,000 average particle size 32 μm) manufactured by Sanko Fine Materials
2. Measurement method (a) Bending strength: Measured according to ASTM D790. 75 MPa or more is preferable.
(B) Flexural modulus: measured in accordance with ASTM D790. 2.0 GPa or more is preferable.
(C) Impact strength: Measured according to ASTM D256. 45 J / m or more is preferable.
(D) Friction coefficient: A cylindrical test piece having an outer diameter of 25.6 mm, an inner diameter of 20 mm, and a thickness of 15 mm was produced using the resin composition. Next, the friction coefficient after 1 hour was measured under the condition of a load of 40 kgf / cm 2 by using a friction force detector of Suzuki type friction wear tester (CM type manufactured by Toyo Keiki Co., Ltd.). The friction coefficient is preferably 0.25 or less.
(E) Continuous productivity: During melt-kneading extrusion, the case where no poor dispersion due to fibrillation and sizing occurred during 10 kg production was evaluated as ◯, and the case where poor dispersion due to fibrillation and surging occurred was evaluated as x.

Example 1
First, 50% by mass of PTFE-A and 50% by mass of PTFE-B1 were premixed. Next, 10% by mass of this PTFE mixed powder and 90% by mass of polyamide resin were melt-kneaded and extruded at a resin temperature of 260 ° C. with a twin-screw extruder (Toshiki Machine Co., Ltd., TEM37-BS), and pelletized.

次いで、このペレットを乾燥した後、射出成形機(東芝機械社製、IS100E−3A)を用いて、シリンダー温度260℃、金型温度100℃の条件で射出成形することにより、各種試験片を作製した。これらの試験片を曲げ強度、曲げ弾性率、摩擦係数の測定に供した。

(実施例2〜4、比較例1〜4)
ポリアミド樹脂の配合割合とPTFEの種類及び配合割合を表1のように変更した以外は、実施例1と同様にして試験片を作製し、それぞれ物性試験に供した。

実施例1〜4及び比較例1〜4で得られた試験片の評価結果を併せて表1に示す。
Next, after drying this pellet, various test pieces were prepared by injection molding under the conditions of a cylinder temperature of 260 ° C. and a mold temperature of 100 ° C. using an injection molding machine (Toshiba Machine Co., Ltd., IS100E-3A). did. These test pieces were subjected to measurement of bending strength, bending elastic modulus, and friction coefficient.

(Examples 2-4, Comparative Examples 1-4)
Test pieces were prepared in the same manner as in Example 1 except that the blending ratio of the polyamide resin, the kind of PTFE, and the blending ratio were changed as shown in Table 1, and each specimen was subjected to a physical property test.

Table 1 shows the evaluation results of the test pieces obtained in Examples 1 to 4 and Comparative Examples 1 to 4.

表1から明らかなように、実施例1〜4はいずれもポリアミド樹脂とPTFEとが本発明の範囲でブレンドされているため、連続生産性が良好であり、その試験片はいずれも良好な機械特性と摩擦係数を有し、摺動性に優れたものであった。 As is clear from Table 1, in Examples 1 to 4, since polyamide resin and PTFE are blended within the scope of the present invention, continuous productivity is good, and the test pieces are all good machines. It had characteristics and a coefficient of friction, and was excellent in sliding properties.

一方、比較例1〜2は、PTFE―Aの配合割合が本発明の上限より多かったため、連続生産性が低いものであった。また、比較例3は、PTFE―Aの配合割合が本発明の下限より少なかったため、試験片の摩擦係数が大きくて摺動性が劣っていた。さらに、比較例4は、ポリアミドの配合割合が本発明の下限より少なかったため、機械特性に劣るものとなった。
On the other hand, Comparative Examples 1 and 2 had a low continuous productivity because the blending ratio of PTFE-A was larger than the upper limit of the present invention. In Comparative Example 3, since the blending ratio of PTFE-A was less than the lower limit of the present invention, the friction coefficient of the test piece was large and the slidability was inferior. Further, Comparative Example 4 was inferior in mechanical properties because the blending ratio of polyamide was less than the lower limit of the present invention.

Claims (1)

(A)数平均分子量1000万〜2000万、平均粒径50〜200μmであるポリテトラフルオロエチレン50〜75質量%、(B)数平均分子量1万〜20万、平均粒径3〜35μmであるポリテトラフルオロエチレン50〜25質量%、(C)前記(A)及び(B)成分の合計量5〜40質量%に対して95〜60質量%のポリアミド樹脂からなる熱可塑性樹脂組成物。 (A) Number average molecular weight of 10 to 20 million, polytetrafluoroethylene having an average particle size of 50 to 200 μm, 50 to 75 mass%, (B) Number average molecular weight of 10,000 to 200,000, and average particle size of 3 to 35 μm A thermoplastic resin composition comprising 95 to 60% by mass of a polyamide resin with respect to 50 to 25% by mass of polytetrafluoroethylene and (C) 5 to 40% by mass of the total amount of the components (A) and (B).
JP2005260911A 2005-09-08 2005-09-08 Thermoplastic resin composition Pending JP2007070537A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015513953A (en) * 2012-03-31 2015-05-18 コーディス・コーポレイションCordis Corporation Smooth medical tubing
CN114381113A (en) * 2021-12-30 2022-04-22 昆山科运新型工程材料科技有限公司 Preparation method of self-lubricating high-wear-resistance fluorine-containing polymer alloy
WO2023182154A1 (en) * 2022-03-22 2023-09-28 Agc株式会社 Resin composition and molded body

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015513953A (en) * 2012-03-31 2015-05-18 コーディス・コーポレイションCordis Corporation Smooth medical tubing
CN114381113A (en) * 2021-12-30 2022-04-22 昆山科运新型工程材料科技有限公司 Preparation method of self-lubricating high-wear-resistance fluorine-containing polymer alloy
WO2023182154A1 (en) * 2022-03-22 2023-09-28 Agc株式会社 Resin composition and molded body

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