JP2005273054A - Electrically conductive fiber, raised fabric for electrically conductive brush, and electrically conductive brush - Google Patents
Electrically conductive fiber, raised fabric for electrically conductive brush, and electrically conductive brush Download PDFInfo
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本発明は、複写機やプリンター等の電子写真装置に用いられる導電性ブラシ、並びにそれを構成する導電性ブラシ用起毛布及び導電性繊維に関する。 The present invention relates to a conductive brush used for an electrophotographic apparatus such as a copying machine or a printer, and a brushed cloth for a conductive brush and a conductive fiber constituting the conductive brush.
複写機あるいはプリンター等における電子写真方式の画像形成プロセスにおいては、各種の導電性を有するブラシ、すなわち導電性ブラシが使用されている。
例えば、感光体のような静電潜像担持体の表面を帯電装置で帯電させる工程においては、導電性ブラシを用いることが知られている。
また、紙等へ転写しなかったトナーが、感光体等の表面に残存するため、これを除去するためにも導電性ブラシが使用されている。
このように、導電性ブラシは電子写真方式の画像形成プロセスにおいて使用されているが、多くの枚数を印刷すると、次第に導電性ブラシを構成する導電性繊維（パイル糸）にトナーや紙粉が付着して、導電性ブラシの体積固有抵抗値が部分的に変化して画像に乱れを生じさせたり、導電性繊維に付着したトナーの凝集体が脱落して印刷面を汚染する等の問題がある。
このような問題を克服するための方法として、例えば導電性ブラシの導電性繊維にトナーと同一極性の電荷を掛ける方法等が用いられているが、機械的に接触するトナーの付着を十分に抑制することはできていない。
In an electrophotographic image forming process in a copying machine or a printer, various conductive brushes, that is, conductive brushes are used.
For example, it is known to use a conductive brush in a process of charging the surface of an electrostatic latent image carrier such as a photoreceptor with a charging device.
Further, since the toner that has not been transferred to the paper or the like remains on the surface of the photoreceptor or the like, a conductive brush is also used to remove the toner.
In this way, conductive brushes are used in electrophotographic image forming processes, but when many sheets are printed, toner and paper dust gradually adhere to the conductive fibers (pile yarn) that make up the conductive brush. As a result, the volume specific resistance value of the conductive brush partially changes to cause the image to be distorted, or the toner aggregates attached to the conductive fibers fall off and contaminate the printing surface. .
As a method for overcoming such a problem, for example, a method of applying a charge having the same polarity as that of the toner to the conductive fiber of the conductive brush is used. However, adhesion of the mechanically contacting toner is sufficiently suppressed. I can't do it.
そこで、導電性ブラシを構成する導電性繊維の材質について幾つかの検討がなされている。特許文献１では、カーボンブラック等の導電性微粒子を混合したポリアミド等の熱可塑性重合体からなる導電性成分と、ポリアミド等の繊維形成性の熱可塑性重合体からなる非導電性成分とが接合されてなる複合繊維において、導電性成分が非導電性成分を完全に包み込むような芯鞘型の複合構造を有する導電性複合繊維を開示している。また、特許文献２では、２０℃、ＲＨ６５％での平衡吸湿率が０．６〜１．５％の脂肪族ポリアミド樹脂に導電性カーボンブラックが混合分散されてなる半導電性脂肪族ポリアミド繊維の有する体積抵抗率が、３５℃、ＲＨ８０％環境下で１．０桁以下にあることを特徴とする半導電性脂肪族ポリアミド繊維が開示されている。しかしながら、それらの繊維から構成される導電性ブラシにおいても、プリンター等で多くの枚数を印刷した場合におけるトナー付着の問題は解消していない。 Therefore, some studies have been made on the material of the conductive fibers constituting the conductive brush. In Patent Document 1, a conductive component made of a thermoplastic polymer such as polyamide mixed with conductive fine particles such as carbon black and a non-conductive component made of a fiber-forming thermoplastic polymer such as polyamide are joined. In this composite fiber, a conductive composite fiber having a core-sheath type composite structure in which the conductive component completely wraps the non-conductive component is disclosed. Patent Document 2 discloses a semiconductive aliphatic polyamide fiber in which conductive carbon black is mixed and dispersed in an aliphatic polyamide resin having an equilibrium moisture absorption of 0.6 to 1.5% at 20 ° C. and RH 65%. A semiconductive aliphatic polyamide fiber having a volume resistivity of 1.0 digit or less in an environment of 35 ° C. and RH 80% is disclosed. However, even in the conductive brush composed of these fibers, the problem of toner adhesion when a large number of sheets are printed by a printer or the like has not been solved.
本発明の目的は、プリンター等の帯電ブラシなどに用いた場合に、多数枚印刷時にもトナーの付着量が少なく、また抵抗値変化の小さい導電性ブラシ、並びにそれを構成する導電性起毛布及び導電性繊維を提供することにある。 An object of the present invention is to provide a conductive brush having a small amount of toner adhesion and a small resistance change even when printing on a large number of sheets when used for a charging brush of a printer or the like, and a conductive brushed cloth constituting the conductive brush and It is to provide a conductive fiber.
本発明者は、前記目的を達成するため、導電性繊維表面の汚染や印刷画質と、導電性繊維の材質との関係に着目して鋭意研究を進めた結果、ポリアミド系樹脂に、それよりも水に対する接触角の大きい樹脂と導電性物質とを含有させた導電性繊維を用いれば、それを有する導電性ブラシは、プリンター等の帯電ブラシなどに用いた場合に、多数枚印刷時に生じるトナーの付着や抵抗値変化等の問題が著しく改善できることを見出し、この知見に基づいて本発明を完成するに至った。 In order to achieve the above object, the present inventor has conducted earnest research focusing on the relationship between the conductive fiber surface contamination and the print image quality and the conductive fiber material. If conductive fibers containing a resin having a large contact angle with water and a conductive material are used, the conductive brush having the conductive fibers can be used to charge toner generated when printing a large number of sheets when used for a charging brush of a printer or the like. It has been found that problems such as adhesion and resistance value change can be remarkably improved, and the present invention has been completed based on this finding.
かくして、本発明によれば、以下の１〜７が提供される。
１． ポリアミド系樹脂（Ａ）１００重量部に対して、前記ポリアミド系樹脂（Ａ）よりも水に対する接触角の大きい樹脂（Ｂ）０．５〜２０重量部及び導電性物質（Ｃ）１０〜４０重量部を含有することを特徴とする導電性繊維。
２． 前記樹脂（Ｂ）が、フッ素系樹脂、シリコン系樹脂及びポリオレフィン系樹脂からなる群から選ばれる少なくとも１種である、１記載の導電性繊維。
３． 前記樹脂（Ｂ）が、フッ素系樹脂である、１記載の導電性繊維。
４． 体積固有抵抗値が１０３〜１０１０Ωｃｍであり、かつ太さが１〜５０デシテックス（ｄＴｅｘ）である、１〜３のいずれか１項に記載の導電性繊維。
５． 導電性物質（Ｃ）がカーボンブラックである、１〜４のいずれか１項に記載の導電性繊維。
６． 基布に１〜５のいずれか１項に記載の導電性繊維を起立してなる、導電性ブラシ用起毛布。
７． ６記載の導電性ブラシ用起毛布を有してなる、電子写真装置用導電性ブラシ。
Thus, according to the present invention, the following 1 to 7 are provided.
1. 0.5 to 20 parts by weight of the resin (B) having a larger contact angle with respect to water than the polyamide resin (A) and 10 to 40 parts by weight of the conductive substance (C) with respect to 100 parts by weight of the polyamide resin (A). A conductive fiber comprising a part.
2. 2. The conductive fiber according to 1, wherein the resin (B) is at least one selected from the group consisting of a fluorine-based resin, a silicon-based resin, and a polyolefin-based resin.
3. 2. The conductive fiber according to 1, wherein the resin (B) is a fluororesin.
4). The conductive fiber according to any one of 1 to 3, having a volume resistivity of 10 3 to 10 10 Ωcm and a thickness of 1 to 50 dtex (dTex).
5). Conductive fiber of any one of 1-4 whose electroconductive substance (C) is carbon black.
6). A brushed fabric for a conductive brush, wherein the conductive fiber according to any one of 1 to 5 is erected on a base fabric.
7). A conductive brush for an electrophotographic apparatus, comprising the brushed cloth for a conductive brush according to claim 6.
本発明の導電性繊維を基布に起立させた導電性起毛布を有してなる導電性ブラシをプリンター等の帯電ブラシとして用いると、多数枚印刷時にもトナーの付着量が少なく、また導電性ブラシの抵抗値変化が小さい。 When a conductive brush having a conductive raised fabric in which the conductive fiber of the present invention is erected on a base fabric is used as a charging brush for a printer or the like, the amount of toner attached is small even when printing a large number of sheets, and the conductive The resistance change of the brush is small.
本発明の導電性繊維は、ポリアミド系樹脂（Ａ）１００重量部に対して、前記ポリアミド系樹脂（Ａ）よりも水に対する接触角の大きい樹脂（Ｂ）０．５〜２０重量部及び導電性物質（Ｃ）１０〜４０重量部を含有することを特徴とする。 The conductive fiber of the present invention comprises 0.5 to 20 parts by weight of a resin (B) having a larger contact angle with respect to water than the polyamide resin (A) and 100 parts by weight of the polyamide resin (A) and conductive. It contains 10 to 40 parts by weight of the substance (C).
ポリアミド系樹脂（Ａ）としては、主鎖にアミド結合（−ＣＯ−ＮＨ−）を有する重合体であれば特に限定されない。例としては、４，６−ナイロン、６−ナイロン、６，６−ナイロン、６，１０−ナイロン、６，１２−ナイロン、１１−ナイロン、１２−ナイロン等の脂肪族ポリアミド；ナイロンＭＸＤ６（商品名「ＭＸナイロン」：三菱ガス化学（株）社製）、商品名「アーレン」（三井化学（株）社製）等の芳香族ポリアミド；等が挙げられる。好ましいものとしては、６−ナイロン、６，６−ナイロン、６，１２−ナイロン、１２−ナイロンが挙げられる。これらの中でも吸水による寸法変化、物性変化が小さく、耐屈曲性に優れる点で６−ナイロン、１２−ナイロンがより好ましい。これらは１種類を単独で、又は２種類以上を組み合わせて用いることができる。
このようなポリアミド樹脂（Ａ）の水に対する接触角（以下、単に「接触角」という場合がある。：θ）は、一般的に６０°〜７５°の範囲である。例えば、６−ナイロンの接触角は６１°であり、６，６−ナイロンは６３°〜７０°であり、１１−ナイロンは７５°である。
The polyamide resin (A) is not particularly limited as long as it is a polymer having an amide bond (—CO—NH—) in the main chain. Examples include aliphatic polyamides such as 4,6-nylon, 6-nylon, 6,6-nylon, 6,10-nylon, 6,12-nylon, 11-nylon, 12-nylon; nylon MXD6 (trade name) "MX nylon": manufactured by Mitsubishi Gas Chemical Co., Ltd.) and aromatic polyamides such as trade name "Aalen" (manufactured by Mitsui Chemicals, Inc.). Preferable examples include 6-nylon, 6,6-nylon, 6,12-nylon, and 12-nylon. Among these, 6-nylon and 12-nylon are more preferable in that they are small in dimensional change and physical property change due to water absorption and are excellent in bending resistance. These can be used alone or in combination of two or more.
Such a polyamide resin (A) has a contact angle with water (hereinafter sometimes simply referred to as “contact angle”: θ) generally in a range of 60 ° to 75 °. For example, the contact angle of 6-nylon is 61 °, 6,6-nylon is 63 ° -70 °, and 11-nylon is 75 °.
前記ポリアミド樹脂（Ａ）よりも水に対する接触角の大きい樹脂（Ｂ）としては、特に限定されないが、通常、水に対する接触角（θ）が８０°以上のものが用いられる。そのような樹脂（Ｂ）としては、フッ素系樹脂、シリコン系樹脂およびポリオレフィン系樹脂から選ばれる少なくとも１種が好ましく用いられる。
フッ素系樹脂としては、例えばポリテトラフルオロエチレン（接触角１０８°〜１１３°）、エチレン−テトラフルオロエチレン共重合体（例えばダイキン工業（株）社製 ＲＰ−４０２０：接触角９６°、ダイキン工業（株）社製 ＲＰ−５０００：接触角９６°など）、ポリビニリデンフルオライド（接触角８２°）などが挙げられる。シリコン系樹脂としては、例えばポリジメチルシロキサン（同１０１°）などが挙げられる。ポリオレフィン系樹脂としては、例えばポリエチレン（同９２°〜９６°）、ポリプロピレン（同９５°〜９８°）、エチレン−プロピレン共重合体（同９２°〜９８°）などが挙げられる。これらの中でもフッ素系樹脂がより好ましい。このような樹脂（Ｂ）は１種類を単独で、又は２種以上を組み合わせて用いることができる。
The resin (B) having a larger contact angle with respect to water than the polyamide resin (A) is not particularly limited, but those having a contact angle (θ) with respect to water of 80 ° or more are usually used. As such a resin (B), at least one selected from a fluorine resin, a silicon resin, and a polyolefin resin is preferably used.
Examples of the fluorine-based resin include polytetrafluoroethylene (contact angle 108 ° to 113 °), ethylene-tetrafluoroethylene copolymer (for example, RP-4020 manufactured by Daikin Industries, Ltd .: contact angle 96 °, Daikin Industries ( Co., Ltd. RP-5000: contact angle 96 °, etc.), polyvinylidene fluoride (contact angle 82 °), and the like. Examples of the silicon-based resin include polydimethylsiloxane (101 °). Examples of the polyolefin resin include polyethylene (92 ° to 96 °), polypropylene (95 ° to 98 °), and ethylene-propylene copolymer (92 ° to 98 °). Among these, a fluorine resin is more preferable. Such resin (B) can be used individually by 1 type or in combination of 2 or more types.
前記ポリアミド樹脂（Ａ）よりも水に対する接触角の小さい樹脂、例えば、ポリアクリル酸メチル（接触角５２°）、ポリビニルアルコール（同３６°）などを使用すると、本発明の目的を達成することが困難である。 When a resin having a smaller contact angle with water than the polyamide resin (A), for example, polymethyl acrylate (contact angle 52 °), polyvinyl alcohol (36 °) is used, the object of the present invention can be achieved. Have difficulty.
前記樹脂（Ｂ）の前記樹脂（Ａ）１００重量部に対する含有量は、通常、０．５〜２０重量部であり、好ましくは１〜１５重量部、より好ましくは２〜１０重量部である。添加量が上記範囲よりも少なすぎると導電性繊維にトナーが付着しやすくなり、一方、上記範囲よりも多すぎると導電性繊維が切断されやすくなり、いずれの場合も好ましくない。 The content of the resin (B) with respect to 100 parts by weight of the resin (A) is usually 0.5 to 20 parts by weight, preferably 1 to 15 parts by weight, and more preferably 2 to 10 parts by weight. If the amount added is less than the above range, the toner tends to adhere to the conductive fibers, whereas if it is more than the above range, the conductive fibers are likely to be cut, which is not preferable in either case.
本発明の導電性組成物に用いる導電性物質（Ｃ）は、無機導電性フィラーと有機導電性フィラーとに大別される。無機導電性フィラーとしては、鉄、コバルト、ニッケル、アルミニウムなどの金属紛；酸化チタン、酸化亜鉛、酸化鉄、酸化タングステンなどの金属酸化物；鱗片状グラファイトカーボン、カーボンブラック、炭素繊維、フラーレン、カーボンナノチューブなどの炭素質フィラー；などが挙げられる。また、有機導電性フィラーとしては、ポリアニリン、ポリピロールなどの導電性高分子；鉄フタロシアニン、フェロセンなどに代表される有機金属錯体；などが挙げられる。その中でも鱗片状グラファイトカーボン、カーボンブラックが好ましく、カーボンブラックがより好ましい。これらは１種類を単独で、又は２種以上を組み合わせて用いることができる。 The electroconductive substance (C) used for the electroconductive composition of this invention is divided roughly into an inorganic electroconductive filler and an organic electroconductive filler. Inorganic conductive fillers include metal powders such as iron, cobalt, nickel, and aluminum; metal oxides such as titanium oxide, zinc oxide, iron oxide, and tungsten oxide; scaly graphite carbon, carbon black, carbon fiber, fullerene, carbon And carbonaceous fillers such as nanotubes. Examples of the organic conductive filler include conductive polymers such as polyaniline and polypyrrole; organometallic complexes represented by iron phthalocyanine, ferrocene, and the like. Among these, scaly graphite carbon and carbon black are preferable, and carbon black is more preferable. These can be used alone or in combination of two or more.
前記カーボンブラックのさらに好ましいものの具体例としては、アセチレンブラック；ケッチェッンブラック；チャンネルブラック；ファーネスブラック；酸化カーボン等の変性カーボン；などが挙げられる。この中でもアセチレンブラックが、ストラクチャーが発達し少量の配合量で所望の半導電性が得られる点で特に好ましい。 Specific examples of more preferable carbon black include acetylene black; Ketchen black; channel black; furnace black; modified carbon such as oxidized carbon; Among these, acetylene black is particularly preferable in that the structure develops and a desired semiconductivity can be obtained with a small amount.
カーボンブラックの一次平均粒子径については特に制限はないが、好ましくは１０〜８０ｎｍの範囲である。 Although there is no restriction | limiting in particular about the primary average particle diameter of carbon black, Preferably it is the range of 10-80 nm.
前記導電性物質（Ｃ）の前記樹脂（Ａ）１００重量部に対する含有量は、通常、１０〜４０重量部、好ましくは２０〜３０重量部である。添加量が前記範囲よりも少なすぎると導電性繊維の体積固有抵抗値が高くなり過ぎて導電性繊維にトナーが付着しやすくなり、一方、前記範囲よりも多すぎると導電性繊維の体積固有抵抗値が低くなり過ぎて、これを用いてなる帯電ブラシが帯電機能を十分発揮することができなくなり、いずれの場合も好ましくない。 The content of the conductive substance (C) with respect to 100 parts by weight of the resin (A) is usually 10 to 40 parts by weight, preferably 20 to 30 parts by weight. If the amount added is too small than the above range, the volume specific resistance value of the conductive fiber becomes too high, and the toner tends to adhere to the conductive fiber. On the other hand, if the amount added is too large, the volume specific resistance of the conductive fiber will increase. The value becomes too low, and the charging brush using the same cannot sufficiently perform the charging function, which is not preferable in any case.
本発明の導電性繊維は、体積固有抵抗値が１０３〜１０１０Ωｃｍであり、かつ太さが１〜５０デシテックス（ｄＴｅｘ）であることが好ましい。 The conductive fiber of the present invention preferably has a volume resistivity of 10 3 to 10 10 Ωcm and a thickness of 1 to 50 dtex (dTex).
前記導電性繊維の体積固有抵抗値は、１０３〜１０１０Ωｃｍが好ましく、１０５〜１０８Ωｃｍがより好ましい。体積固有抵抗値がこの範囲内にあることにより、前記導電性繊維へのトナーの付着が抑えられ、また前記導電性繊維を用いてなる帯電ブラシが帯電機能を十分発揮することができる。 The volume resistivity value of the conductive fiber is preferably 10 3 to 10 10 Ωcm, and more preferably 10 5 to 10 8 Ωcm. When the volume specific resistance value is within this range, toner adhesion to the conductive fibers can be suppressed, and the charging brush using the conductive fibers can sufficiently exhibit the charging function.
前記導電性繊維の太さは、１〜５０デシテックス（ｄＴｅｘ）であることが好ましく、１〜１０デシテックスであることがより好ましい。前記導電性繊維の太さがこの範囲内にあることにより、導電性繊維の切断が起こりにくく、かつ適度な柔軟性を有することで帯電ドラム等を傷つけない導電性ブラシを構成することができる。 The thickness of the conductive fiber is preferably 1 to 50 dtex, and more preferably 1 to 10 dtex. When the thickness of the conductive fiber is within this range, it is possible to form a conductive brush that does not easily cut the conductive fiber and that does not damage the charging drum or the like by having an appropriate flexibility.
前記導電性繊維には、所望により、酸化防止剤、紫外線吸収剤、紫外線安定剤、架橋反応抑制剤、可塑剤、分散剤、非導電性充填剤などの公知の各種添加剤を、本発明の効果を損なわない程度に配合することができる。 If necessary, the conductive fiber may be added with various known additives such as an antioxidant, an ultraviolet absorber, an ultraviolet stabilizer, a crosslinking reaction inhibitor, a plasticizer, a dispersant, and a nonconductive filler. It can mix | blend to such an extent that an effect is not impaired.
前記導電性繊維を製造する方法は、特に限定されない。一例としては、下記の方法が挙げられる。前記ポリアミド系樹脂（Ａ）、前記樹脂（Ｂ）、前記導電性物質（Ｃ）及び前記各種添加剤を、ヘンシェルミキサーやタンブラー等の混合機を用いて混合し、それをペレット用押出機に供給して溶融混練した後に線状に押出し、３〜５ｍｍ長さに切断してペレットを得る。このペレットを、溶融紡糸機に供給し、所定の太さの繊維に加工することにより前記導電性繊維とする。 The method for producing the conductive fiber is not particularly limited. The following method is mentioned as an example. The polyamide-based resin (A), the resin (B), the conductive material (C), and the various additives are mixed using a mixer such as a Henschel mixer or a tumbler and supplied to a pellet extruder. Then, after being melt-kneaded, it is extruded in a linear shape and cut to a length of 3 to 5 mm to obtain pellets. This pellet is supplied to a melt spinning machine and processed into a fiber having a predetermined thickness to obtain the conductive fiber.
本発明の導電性ブラシ用起毛布は、基布に前記導電性繊維を起立してなる。 The raised fabric for conductive brushes of the present invention is formed by raising the conductive fibers on a base fabric.
前記基布は特に限定されず、導電性のものでも、非導電性のものでも良い。その中においても、ポリエステル等の繊維を綾織してなるものが、柔軟性を有する点や、導電性繊維を起立しやすい点などにおいて優れているため好ましい。 The base fabric is not particularly limited, and may be conductive or non-conductive. Among them, those obtained by twilling a fiber such as polyester are preferable because they are excellent in flexibility and easy to stand up conductive fibers.
前記基布に前記導電性繊維を起立する方法は、特に限定されないが、前記基布に前記導電性繊維を毛ばさみ織りすることで起立する方法が好ましい。 The method of raising the conductive fibers on the base fabric is not particularly limited, but a method of standing up by weaving the conductive fibers on the base fabric is preferred.
前記導電性ブラシ用起毛布の製造方法は特に限定されないが、前記基布に前記導電性繊維を起立した起毛布に、前記導電性繊維を起立した面と反対の面（導電性繊維の起立していない方の面）から水系導電性コーティング剤を塗布・浸透させ、その後乾燥することで好適に得ることができる。 The method for producing the conductive brush raising cloth is not particularly limited, but the surface of the raised cloth opposite to the surface on which the conductive fibers are raised (the standing up of the conductive fibers) is provided on the raised cloth. The water-based conductive coating agent can be applied and infiltrated from the other side), and then dried to obtain it suitably.
本発明の導電性ブラシは、前記導電性ブラシ用起毛布を有してなる。 The conductive brush of this invention has the said brush raising cloth for conductive brushes.
前記導電性ブラシの形状及び製造方法は、共に特に限定されない。一例として、円筒状の金属製基板の上に、前記導電性ブラシ用起毛布を、前記導電性繊維を起立した面と反対の面に導電性接着剤等を塗り、前記基板に貼り付ける事で円筒状の前記導電性ブラシを製造することができる。本発明の導電性ブラシは、電子写真装置用の帯電ブラシ等に好適に用いられる。 The shape and manufacturing method of the conductive brush are not particularly limited. As an example, on a cylindrical metal substrate, the conductive brush brushed fabric, a conductive adhesive or the like on the surface opposite to the surface on which the conductive fibers are raised, and affixed to the substrate The cylindrical conductive brush can be manufactured. The conductive brush of the present invention is suitably used for a charging brush for an electrophotographic apparatus.
以下に実施例を挙げて本発明を更に詳細に説明する。実施例中における部及び％は、特に言及がない限り、重量基準である。 Hereinafter, the present invention will be described in more detail with reference to examples. Parts and percentages in the examples are by weight unless otherwise specified.
なお、本発明において、ポリアミド系樹脂（Ａ）及び樹脂（Ｂ）の水に対する接触角の測定には純水を用い、装置は、接触角計ＣＡ−ＤＳ型（協和界面科学（株）社製）を用いた。
また、体積固有抵抗値は、測定器として、極超絶縁計ＳＭ８２１３型（東亜電波工業（株）社製）を使用して測定した。長さ７ｃｍの導電性繊維の両端１ｃｍの部分にそれぞれ導電性ペースト（ドータイト：藤倉化成（株）社製）を塗り１時間乾燥させ、その後、導電性繊維の両端部の導電性ペーストを塗った部分を測定器に接続して抵抗値を測定した。得られた抵抗値に導電性繊維の断面積を掛けて体積固有抵抗値とした。なお測定は、温度２３℃、相対湿度５５％にて行った。
In the present invention, pure water is used for measuring the contact angles of the polyamide-based resin (A) and the resin (B) with respect to water, and the apparatus is a contact angle meter CA-DS type (manufactured by Kyowa Interface Science Co., Ltd.). ) Was used.
Further, the volume resistivity value was measured using a hyper insulation meter SM8213 type (manufactured by Toa Denpa Kogyo Co., Ltd.) as a measuring instrument. A conductive paste (Dotite: manufactured by Fujikura Kasei Co., Ltd.) was applied to each 1 cm portion of both ends of a 7 cm long conductive fiber and dried for 1 hour, and then the conductive paste at both ends of the conductive fiber was applied. The part was connected to a measuring instrument and the resistance value was measured. The obtained resistance value was multiplied by the cross-sectional area of the conductive fiber to obtain a volume specific resistance value. The measurement was performed at a temperature of 23 ° C. and a relative humidity of 55%.
〔導電性繊維の製造〕
ポリアミド系樹脂（Ａ）として９８％硫酸相対粘度（９８％硫酸相対粘度とは、繊維２５ｇを９８％硫酸２５ｍｌに溶解し、オストワルド粘度計を用いて２５℃で測定した値である。）が２．６である６−ナイロン（接触角６１°）１００重量部、前記ポリアミド系樹脂（Ａ）よりも水に対する接触角の大きい樹脂（Ｂ）としてフッ素系樹脂（ネオフロン ＲＰ−４０２０：ダイキン化学工業（株）社製、接触角９６°）１重量部、導電性物質（Ｃ）としてカーボンブラックの１種であるアセチレンブラック（デンカブラック：電気化学工業（株）社製）２６重量部、酸化防止剤としてイルガノックスＢ１１７１（チバスペシャリティーケミカルス（株）社製）０．２重量部を、二軸同方向押出機を用いて混練し、ペレットを作製した。このペレットを、押出機を用いて溶融紡糸法により太さ５デシテックス、体積固有抵抗値１×１０６Ωｃｍの導電性繊維を得た。
[Manufacture of conductive fibers]
The polyamide-based resin (A) has a 98% sulfuric acid relative viscosity (98% sulfuric acid relative viscosity is a value obtained by dissolving 25 g of fiber in 25 ml of 98% sulfuric acid and measuring at 25 ° C. using an Ostwald viscometer). .6 Nylon (contact angle 61 °) 100 parts by weight, fluorine resin (Neofuron RP-4020: Daikin Chemical Industries, Ltd.) as a resin (B) having a larger contact angle with water than the polyamide resin (A) Co., Ltd., contact angle 96 °) 1 part by weight, 26 parts by weight of acetylene black (DENKA BLACK: manufactured by Denki Kagaku Kogyo Co., Ltd.), which is one type of carbon black as the conductive substance (C), antioxidant As a result, 0.2 part by weight of Irganox B1171 (manufactured by Ciba Specialty Chemicals Co., Ltd.) was kneaded using a twin-screw co-directional extruder to produce pellets. From the pellet, conductive fibers having a thickness of 5 dtex and a volume resistivity of 1 × 10 6 Ωcm were obtained by melt spinning using an extruder.
〔導電性ブラシの製造〕
前述の方法で得られた導電性繊維を用いて、太さ８０番のポリエステル繊維を綾織してなる基布に、植毛密度６０，０００本／平方インチになるように、毛ばさみ織りで織布して起立し、長さ６ｍｍの導電性繊維を有する起毛布を得た。この起毛布の導電性繊維の起立していない方の面から、ロールコーターで体積固有抵抗値が７５Ωｃｍの水系コーティング剤を、起毛布１ｍ２当たり固形分で６０ｇ塗布した。６０℃の乾燥機で８時間乾燥し、導電性ブラシ用起毛布を得た。
得られた導電性ブラシ用起毛布を用いて、外径８ｍｍの金属棒に巻き付けて外径１６ｍｍ、起毛布を巻き付けた部分の長さ２５ｃｍの導電性ブラシを得た。
[Manufacture of conductive brush]
Using the conductive fibers obtained by the above-mentioned method, a base fabric formed by twilling polyester fiber having a thickness of 80 is used with a hair shear weave so that the flocking density is 60,000 pieces / square inch. A raised fabric having conductive fibers having a length of 6 mm was obtained. From the surface of the raised fabric where the conductive fibers were not raised, 60 g of a water-based coating agent having a volume resistivity of 75 Ωcm was applied in a solid content per 1 m 2 of the raised fabric using a roll coater. It dried for 8 hours with the dryer of 60 degreeC, and the brushed cloth for conductive brushes was obtained.
Using the resulting brushed cloth for conductive brushes, a conductive brush having an outer diameter of 16 mm and a length of 25 cm of the portion wound with the brushed cloth was obtained by winding the metal brush with an outer diameter of 8 mm.
〔トナーとの接触試験〕
内寸幅３ｃｍ、内寸長さ２５ｃｍ、内寸高さ５ｃｍの金属製の箱に、直径３ｃｍ、長さ２５ｃｍの金属棒及び前記導電性ブラシを入れ、長さ方向にて金属棒と導電性ブラシとを接触させた。そのとき、金属棒の中心と導電性ブラシの金属軸の中心との距離は２２ｍｍであった。その状態で、導電性ブラシを１２０ｒｐｍで回転させながら、さらにトナー（平均粒子径８μｍ、ポリエステル系粉砕トナー）と接触させた。トナーは５ｇを用いた。１０時間経過後の導電性ブラシへのトナー付着の様子を観察した。
また、導電性ブラシの抵抗値の変化率を、
（抵抗値の変化率）＝｛（試験後の抵抗値）−（試験前の抵抗値）｝÷（試験前の抵抗値）×１００
の式から求めた。ここで、試験前後の各抵抗値は、導電性ブラシの中心から１２ｍｍ離れた１０ｍｍφの金属棒と、導電性ブラシの金属軸との間の抵抗値を測定することで求めた。抵抗値の測定には、測定器として、極超絶縁計ＳＭ８２１３型（東亜電波工業（株）社製）を使用した。また、測定は、温度２０℃、相対湿度５５％下で行った。
また、試験終了後（１０時間経過後）の導電性ブラシの導電性繊維を観察した。結果を表１に示す。
[Contact test with toner]
Put a metal rod with a diameter of 3 cm and a length of 25 cm and the conductive brush in a metal box with an inner dimension width of 3 cm, an inner dimension length of 25 cm, and an inner dimension height of 5 cm. The brush was brought into contact. At that time, the distance between the center of the metal rod and the center of the metal axis of the conductive brush was 22 mm. In this state, the conductive brush was further brought into contact with the toner (average particle size 8 μm, polyester-based pulverized toner) while rotating the conductive brush at 120 rpm. 5 g of toner was used. The state of toner adhesion to the conductive brush after 10 hours was observed.
Also, the rate of change in resistance value of the conductive brush
(Change rate of resistance value) = {(resistance value after test) − (resistance value before test)} ÷ (resistance value before test) × 100
It was obtained from the formula of Here, each resistance value before and after the test was obtained by measuring a resistance value between a 10 mmφ metal rod 12 mm away from the center of the conductive brush and the metal shaft of the conductive brush. For the measurement of resistance value, a hyperinsulation meter SM8213 type (manufactured by Toa Radio Industry Co., Ltd.) was used as a measuring instrument. The measurement was performed at a temperature of 20 ° C. and a relative humidity of 55%.
Moreover, the conductive fiber of the conductive brush after completion | finish of a test (after 10-hour progress) was observed. The results are shown in Table 1.
フッ素系樹脂の使用量を５重量部に変更した以外は、実施例１と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。結果を表１に示す。 A conductive fiber, a brushed fabric for a conductive brush, and a conductive brush were prepared in the same manner as in Example 1 except that the amount of the fluororesin was changed to 5 parts by weight. The test was performed in the same manner as in Example 1. went. The results are shown in Table 1.
フッ素系樹脂の使用量を１５重量部に変更した以外は、実施例１と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。結果を表１に示す。 A conductive fiber, a brushed fabric for a conductive brush, and a conductive brush were produced in the same manner as in Example 1 except that the amount of the fluororesin was changed to 15 parts by weight. The test was performed in the same manner as in Example 1. went. The results are shown in Table 1.
［比較例１］
フッ素系樹脂を使用しなかった以外は、実施例１と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。結果を表１に示す。
[Comparative Example 1]
A conductive fiber, a brushed fabric for a conductive brush, and a conductive brush were produced in the same manner as in Example 1 except that the fluororesin was not used, and the test was performed in the same manner as in Example 1. The results are shown in Table 1.
［比較例２］
フッ素系樹脂の使用量を４０重量部に変更した以外は、実施例１と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。結果を表１に示す。
[Comparative Example 2]
Except for changing the amount of the fluororesin used to 40 parts by weight, conductive fibers, a conductive brush raising cloth, and a conductive brush were produced in the same manner as in Example 1, and the test was performed in the same manner as in Example 1. went. The results are shown in Table 1.
［比較例３］
フッ素系樹脂１重量部に変えて、ポリアクリル酸メチル（アルドリッチ（株）社製、接触角５２°）５重量部を使用した以外は、実施例１と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。結果を表１に示す。
[Comparative Example 3]
Conductive fibers and conductive brushes in the same manner as in Example 1 except that 5 parts by weight of polymethyl acrylate (Aldrich Co., Ltd., contact angle 52 °) was used instead of 1 part by weight of the fluororesin. A brushed fabric for use and a conductive brush were prepared and tested in the same manner as in Example 1. The results are shown in Table 1.
フッ素系樹脂を使用しなかった比較例１では、試験終了後の導電性ブラシの導電性繊維にトナーが多く付着しているのが観察された。また、フッ素系樹脂を４０重量部使用した比較例２では、試験終了後の導電性ブラシの導電性繊維の先端部が一部切断していた。また、フッ素系樹脂に変えて、６−ナイロンよりも水に対する接触角の小さいポリアクリル酸メチルを使用した比較例３では、試験終了後の導電性ブラシの導電性繊維にトナーが多く付着しているのが観察された。 In Comparative Example 1 in which no fluororesin was used, it was observed that a large amount of toner adhered to the conductive fibers of the conductive brush after the test was completed. Moreover, in the comparative example 2 which used 40 weight part of fluororesins, the front-end | tip part of the conductive fiber of the conductive brush after completion | finish of a test was partially cut | disconnected. Further, in Comparative Example 3 in which polymethyl acrylate having a smaller contact angle with respect to water than 6-nylon was used instead of fluorine resin, a large amount of toner adhered to the conductive fibers of the conductive brush after the test was completed. Was observed.
これに対し、６−ナイロンよりも水に対する接触角の大きいフッ素系樹脂を本発明の範囲内の量使用した実施例１〜３では、試験終了後の導電性ブラシの導電性繊維を観察したところ変化はなく、トナー付着量も少なかった。 On the other hand, in Examples 1 to 3, in which fluorine resin having a larger contact angle with water than 6-nylon was used within the scope of the present invention, the conductive fibers of the conductive brush after the test was observed. There was no change and the amount of toner adhered was small.
Claims (7)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008186012A (en) * | 2007-01-29 | 2008-08-14 | Toshiba Corp | Cleaning device and image forming apparatus using the same |
| JP2008257227A (en) * | 2007-03-15 | 2008-10-23 | Ricoh Co Ltd | Image forming method and process cartridge |
| JP2009198568A (en) * | 2008-02-19 | 2009-09-03 | Seiko Epson Corp | Fixing device and image forming apparatus using it |
| JP2012217730A (en) * | 2011-04-12 | 2012-11-12 | Kb Seiren Ltd | Core-in-sheath conductive fiber for cosmetic brush |
| JP2021001406A (en) * | 2019-06-19 | 2021-01-07 | Dic株式会社 | Conductive fiber and method for producing the same |
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- 2004-03-24 JP JP2004086112A patent/JP2005273054A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008186012A (en) * | 2007-01-29 | 2008-08-14 | Toshiba Corp | Cleaning device and image forming apparatus using the same |
| JP2008257227A (en) * | 2007-03-15 | 2008-10-23 | Ricoh Co Ltd | Image forming method and process cartridge |
| JP2009198568A (en) * | 2008-02-19 | 2009-09-03 | Seiko Epson Corp | Fixing device and image forming apparatus using it |
| JP2012217730A (en) * | 2011-04-12 | 2012-11-12 | Kb Seiren Ltd | Core-in-sheath conductive fiber for cosmetic brush |
| JP2021001406A (en) * | 2019-06-19 | 2021-01-07 | Dic株式会社 | Conductive fiber and method for producing the same |
| JP7358796B2 (en) | 2019-06-19 | 2023-10-11 | Dic株式会社 | Conductive fiber and its manufacturing method |
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