JP2009271158A5

JP2009271158A5 -

Info

Publication number: JP2009271158A5
Application number: JP2008119511A
Authority: JP
Filing date: 2008-05-01
Publication date: 2011-06-23

Description

中間転写ベルト方式でカラープリントを行う画像形成装置は、図２に示したように、ブラックＢ、イエローＹ、マゼンタＭ、シアンＣの４色でそれぞれ現像を行う４台の現像器１ａ〜１ｄで、各感光ドラム２ａ〜２ｄにそれぞれの色でトナー像を形成し、各感光ドラム２ａ〜２ｄに接して張設された中間転写ベルト３に転写ローラ５から電圧を印加して、各感光ドラム２ａ〜２ｄに形成された各色（ブラックＢ、イエローＹ、マゼンタＭ、シアンＣ）のトナー像を中間転写ベルト３の表面に転写して該中間転写ベルト３の表面にカラー画像を形成し、二次転写ローラ７でこの中間転写ベルト３に接触した記録用紙（記録メディア）４に電圧を印加して、中間転写ベルト３表面のカラー像を転写し、これを定着器６で加熱して定着させるようになっている。 As shown in FIG. 2, an image forming apparatus that performs color printing using an intermediate transfer belt system includes four developing devices 1a to 1d that perform development with four colors of black B, yellow Y, magenta M, and cyan C, respectively. A toner image is formed in each color on each of the photosensitive drums 2a to 2d, and a voltage is applied from the transfer roller 5 to the intermediate transfer belt 3 stretched in contact with each of the photosensitive drums 2a to 2d. The toner images of the respective colors (black B, yellow Y, magenta M, cyan C) formed in 2d are transferred onto the surface of the intermediate transfer belt 3 to form a color image on the surface of the intermediate transfer belt 3, and the secondary image A voltage is applied to the recording paper (recording medium) 4 in contact with the intermediate transfer belt 3 by the transfer roller 7 to transfer the color image on the surface of the intermediate transfer belt 3 , and this is heated and fixed by the fixing device 6. In You have me.

しかしながら、合成ゴムや液状ポリウレタン等から得られたソリッド材は、反発弾性が高く乾燥環境下での摩擦係数も高いため、プーリー通過時のスティックスリップ振動によって所謂ビビリ音が発生しやすく、またせり上がりによる脱線が発生する場合もある。また、ミラブルシリコーンや発泡ウレタン等の低反発材の場合は、引き裂き強度に劣り、また耐磨耗性も必ずしも十分ではなく、特に磨耗粉の発生により画質劣化を招く場合がある。更に、ウレタン材料の場合、用いられる硬化剤に含まれるアミンに発癌性が指摘されており、環境負荷低減のために使用をさけることが望ましい。 However, solid materials obtained from synthetic rubber, liquid polyurethane, etc. have high resilience and a high coefficient of friction in dry environments. Derailment due to may occur. In addition, in the case of a low resilience material such as millable silicone or foamed urethane, the tear strength is inferior and the wear resistance is not always sufficient, and the image quality may be deteriorated due to the generation of abrasion powder. Furthermore, in the case of a urethane material, carcinogenicity is pointed out to the amine contained in the curing agent used, and it is desirable to avoid use for reducing the environmental load.

本発明者は、上記目的を達成するため鋭意検討を行った結果、無端ベルトの一面側に周方向に沿ったガイドリブを突設して、中間転写ベルトなどの導電性エンドレスベルトを製造する場合に、上記ガイドリブをミラブルウレタンゴムを用いて形成することにより、低反発弾性で、柔軟性に優れると共に、耐磨耗性にも優れるガイドリブを形成することができ、かつ摩擦係数の低減化によりスティックスリップによるビビリ音の発生も防止することが可能であり、しかも液状ポリウレタンを用いる場合のようにアミン系の硬化剤を必要とすることもないので、環境負荷も低減することができ、良好な走行安定性、耐久性及び走行静粛性を有する導電性エンドレスベルトが得られることを見出し、本発明を完成したものである。 As a result of intensive studies to achieve the above object, the present inventors have produced a conductive endless belt such as an intermediate transfer belt by projecting a guide rib along the circumferential direction on one surface side of an endless belt. By forming the above guide ribs using millable urethane rubber, it is possible to form guide ribs with low rebound resilience, excellent flexibility, and excellent wear resistance, and by reducing the friction coefficient, stick slip It is also possible to prevent chatter noises caused by squeezing, and since no amine-based curing agent is required as in the case of using liquid polyurethane, environmental impact can be reduced and good running stability can be achieved. The present invention has been completed by finding that a conductive endless belt having high performance, durability and running quietness can be obtained.

本発明導電性エンドレスベルトのガイドリブ３２は、上記ミラブルウレタンゴムを用いて形成したことにより、低反発弾性化を図りながら摩擦係数を低減化することができる。即ち、液状ウレタンなどの従来の材料を用いた場合は磨耗による磨耗粉の発生を防止するため摩擦係数を低減化しようとすると、ゴムが硬くなって反発弾性が高くなり、せり上がりやビビリ音の発生などの走行不良が発生し、両性能を同時に満足させることは到底困難であるが、本発明ではこの二律背反的課題を同時に解決し得るものである。 Since the guide rib 32 of the conductive endless belt of the present invention is formed using the millable urethane rubber, the friction coefficient can be reduced while achieving low rebound resilience. In other words, when using conventional materials such as liquid urethane, if you try to reduce the friction coefficient in order to prevent the generation of abrasion powder due to wear, the rubber becomes harder and the resilience becomes higher, causing rise and chatter noise. However, it is difficult to satisfy both performances at the same time. However, in the present invention, this contradictory problem can be solved at the same time.

［比較例１］
液状ウレタン（日本ポリウレタン社製「コロネート４０７６」）１００質量部に、硬化剤として芳香族アミン（４，４’メチレン−ビスジクロロアニリン）７．４質量部を添加し、６０℃に加熱して２時間硬化させて、長さ７００ｍｍ、幅３００ｍｍのシート状サンプルを作製し、このサンプルから実施例１〜９と同様寸法のガイドリブ部材を切り出した。上記実施例１〜９と同様に摩擦係数、ビビリ音の発生、耐磨耗性、硬度、圧縮永久歪、反発弾性率を評価した。結果を表２に示す。 [Comparative Example 1]
Liquid urethane (“Coronate 4076” manufactured by Nippon Polyurethane Co., Ltd.) 7.4 parts by mass of an aromatic amine (4,4′methylene-bisdichloroaniline ) as a curing agent is added to 100 parts by mass, heated to 60 ° C. and 2 A sheet-like sample having a length of 700 mm and a width of 300 mm was produced by time curing, and a guide rib member having the same dimensions as in Examples 1 to 9 was cut out from this sample. In the same manner as in Examples 1 to 9, the friction coefficient, generation of chatter noise, wear resistance, hardness, compression set, and impact resilience were evaluated. The results are shown in Table 2.

［比較例２］
天然ゴム（ＲＳＳ＃１）１００質量部、ＳＲＦカーボン１５質量部、亜鉛華５質量部、ステアリン酸１質量部、ジオクチルフタレート（ＤＯＰ）１０質量部、加硫促進剤：テトラメチルチウラムモノスルフィド（ＴＭＴＭ）１．５質量部、加硫促進剤：Ｎ−シクロヘキシル−２−ベンゾチアゾリルスルフェンアミド（ＣＺ）２質量部、炭酸カルシウム１０質量部、硫黄０．５質量部を混合し、１６０℃で２０分プレス加硫して、実施例１〜９と同様寸法のガイドリブ部材を作製した。上記実施例１〜９と同様に摩擦係数、ビビリ音の発生、耐磨耗性、硬度、圧縮永久歪、反発弾性率を評価した。結果を表２に示す。 [Comparative Example 2]
Natural rubber (RSS # 1) 100 parts by mass, SRF carbon 15 parts by mass, zinc white 5 parts by mass, stearic acid 1 part by mass, dioctyl phthalate (DOP) 10 parts by mass, vulcanization accelerator: tetramethylthiuram monosulfide (TMTM ) 1.5 parts by mass, vulcanization accelerator: 2 parts by mass of N-cyclohexyl-2-benzothiazolylsulfenamide (CZ), 10 parts by mass of calcium carbonate, 0.5 parts by mass of sulfur are mixed at 160 ° C. A guide rib member having the same dimensions as those of Examples 1 to 9 was produced by press vulcanization for 20 minutes. In the same manner as in Examples 1 to 9, the friction coefficient, generation of chatter noise, wear resistance, hardness, compression set, and impact resilience were evaluated. The results are shown in Table 2.

［比較例３］
アクリルゴム（ＪＳＲ社製「ＡＲＥＸ４１１」）１００質量部、ＳＲＦカーボン１５質量部、ステアリン酸１質量部、老化防止剤（ノックラックＣＤ）２質量部、ステアリン酸ナトリウム２．５質量部、炭酸カルシウム１０質量部、硫黄（鶴見化学工業（株）製「サルファックスＰＭＣ」）０．３質量部を混合し、１０Ｌのニーダで混練し、６００ｍｍ×３００ｍｍ×１５ｍｍの金型を用いて１６０℃，１５分の条件で加硫成形し、実施例１〜９と同様寸法のガイドリブ部材を作製した。上記実施例１〜９と同様に摩擦係数、ビビリ音の発生、耐磨耗性、硬度、圧縮永久歪、反発弾性率を評価した。結果を表２に示す。 [Comparative Example 3]
100 parts by weight of acrylic rubber (“AREX411” manufactured by JSR), 15 parts by weight of SRF carbon, 1 part by weight of stearic acid, 2 parts by weight of anti-aging agent (Nocklac CD), 2.5 parts by weight of sodium stearate, 10 parts of calcium carbonate Part by mass, 0.3 part by mass of sulfur (“Sulfax PMC” manufactured by Tsurumi Chemical Co., Ltd.) are mixed, kneaded with a 10 L kneader, and 160 ° C. for 15 minutes using a 600 mm × 300 mm × 15 mm mold. The guide rib member having the same dimensions as those of Examples 1 to 9 was produced by vulcanization molding under the conditions described above. In the same manner as in Examples 1 to 9, the friction coefficient, generation of chatter noise, wear resistance, hardness, compression set, and impact resilience were evaluated. The results are shown in Table 2.

（ビビリ音の発生）
上記（摩擦係数）測定の際と同様にしてローラとガイドリブ部材とを摺動させ、摩擦係数を測定する際の摩擦音を高速フーリエ解析機（ＦＦＴ）を用いて周波数分析し、◎，○，△，×の４段階で評価した。 (Generation of chatter noise)
The (coefficient of friction) slide the roller and the guide rib member in the same manner as the time of measurement, the friction sound when measuring the friction coefficient frequency analysis using fast Fourier analysis machine (FFT), ◎, ○, Evaluation was made in four stages, Δ and ×.

表１，２の結果から、本発明導電性エンドレスベルトのガイドリブを形成するゴム組成物が、良好な性能を有するものであることが確認された。
From the results of Tables 1 and 2, the rubber composition forming the guide ribs of the present invention the conductive endless belt, it was confirmed that those having a good good performance.