JP2005002169A - Thermosetting polyurethane composition and roll or belt for oa equipment obtained using the same - Google Patents
Thermosetting polyurethane composition and roll or belt for oa equipment obtained using the same Download PDFInfo
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は圧縮歪みの小さいエラストマー用ポリウレタン組成物、それより得られるＯＡ機器用ロール又はベルトに関するもので、さらには適度の硬さであり、破断時延びが１００〜３００％あり、低歪み時の、圧縮永久歪みが十分低いエラストマーが得られる熱硬化性ポリウレタン組成物であり、該組成物を用いて得られるＯＡ機器用ロール又はベルトに関するものである。
【０００２】
【従来の技術】
ポリウレタンエラストマーは機械的強度や耐摩耗性に優れ、その加工のしやすさや硬化物の硬度がＪＩＳ Ａ硬度で２０〜１００とバリエーションが豊富なことから工業用ロールやベルトをはじめ、自動車用部材、ＯＡ機器用部材など多方面に使用されてきている。
こういった中で近年、ＪＩＳ Ａ硬度で５０〜７５程度の中硬度ロール用のウレタンエラストマーに対する需要が増えつつあり、その中で性能的にも加工性にも優れ、従来の２５％圧縮条件下から実体に即した１０％圧縮条件下での圧縮永久歪みでエラストマーの評価を行うようになってきた。
【０００３】
【発明が解決しようとする課題】
従来知られていた７５〜９５のような硬いエラストマーではなく、ＪＩＳ Ａ硬度が５０〜７５の中硬度で実質的に圧縮永久歪みのなく耐久性の優れているエラストマーが求められてきている。
【０００４】
例えば可塑剤を含まず、低硬度、低圧縮永久歪みを特徴とするローラとして、特開平７−１１０６１７号には官能基数２〜３、平均分子量１０００〜３０００のポリオールとひまし油系ポリオールおよびイソシアネートを反応させてなるエラストマーを主弾性層材料とする帯電ローラが提案され、また特開平８−１５１４２３号にはＪＩＳ Ａ硬度で１０以下という低硬度範囲において、ＭＤＩ及び変性ＭＤＩと多官能ポリプロピレングリコールから得られる圧縮永久歪みが５％以下という軟質ポリウレタンエラストマー成型品の提案がある。
【０００５】
更に表面粘着性を改善したものとして特開平９−１１４１９０号には脂肪族イソシアネートと導電性付与剤を分散させたポリオールとを反応させて得られる導電性ローラが提案されている。また特開平９−１７６２６９号にはポリイソシアネートとポリオールとの重合反応により生成されるウレタン結合を含むポリウレタン樹脂を主材としてなり、アスカーＣ硬度が８５°以下、圧縮永久歪みが６％以下、アセトン抽出量が４％以下であることを特徴とする弾性材料から得られる弾性ローラが提案されている。しかしながら現状では十分に満足する中硬度ロール用のウレタンエラストマーは得られていない。
【０００６】
本発明の課題は上記問題点に鑑み、５０〜７５のＪＩＳ Ａ硬度を有し、圧縮永久歪みが十分低い、作業性に優れた、熱硬化型の中硬度ポリウレタン組成物、それより得られる中硬度ロール及びベルトを提供することにある。
【０００７】
【特許文献１】
特開平７−１１０６１７号公報
【特許文献２】
特開平８−１５１４２３号公報
【特許文献３】
特開平９−１１４１９０号公報
【特許文献４】
特開平９−１７６２６９号公報
【０００８】
【課題を解決するための手段】
本発明は下記の（１）〜（５）に記載されたものである。
発明（１）ジフェエニルメタンジイソシアネート（Ａ）と数平均分子量が６５０〜５０００のポリオキシテトラメチレングリコール（Ｂ）を反応させて得られるイソシアネート基末端プレポリマーを主成分とする主剤と、数平均分子量が６５０〜５０００のポリオキシテトラメチレングリコールとトリメチロールプロパンの混合物を含有する硬化剤からなる組成物であって、かつ、架橋剤濃度が０．１０〜０．２５ｍｍｏｌ／ｇｒである熱硬化性ポリウレタン組成物。
【０００９】
発明（２） プレポリマーのイソシアネート基含有量が１．５〜１５質量％である（１）記載のポリウレタン組成物。
【００１０】
発明（３） （１）又は（２）記載の主剤と硬化剤を、イソシアネート基／水酸基＝０．８５〜１．２０の当量比で反応させて得られる熱硬化性ポリウレタン組成物。
【００１１】
（４） 硬さがＪＩＳ Ａ硬度で５０〜７５、破断時伸びが１００〜３００％、圧縮率１０％の条件化の圧縮永久歪みが１％未満のエラストマー製造用である請求項１〜３のいずれかに記載の熱硬化性ポリウレタン組成物。
【００１２】
（５） （１）〜（３）のいずれかに記載の熱硬化性ポリウレタン組成物から作成される、硬さがＪＩＳ Ａ硬度で５０〜７５、破断時伸びが１００〜３００％、圧縮率１０％の条件化の圧縮永久歪みが１％未満のＯＡ機器用ロール又はベルト
【００１３】
【発明の実施の形態】
本発明はイソシアネート基末端プレポリマーを主成分とする主剤とポリオールを主成分とする硬化剤の２成分からなる組成物である。
主剤の主成分に用いられるイソシアネートは、ジフェエニルメタンジイソシアネート（Ａ）であり、この化合物には、イソシアネート基（以下、ＮＣＯ基と略することもある。）の付く位置の異なった異性体が存在する。具体的には、２，２´−ジフェエニルメタンジイソシアネート、２，４´−ジフェエニルメタンジイソシアネート、４、４´−ジフェエニルメタンジイソシアネートである。市販のジフェニルメタンジイソシアネート（以下、ＭＤＩと略することもある）はこれらの混合物である。本発明には、４、４´異性体が９８モル％を超えるジフェニルメタンジイソシアネートが好ましく用いられる。
（Ａ）を含有する主成分には、ＭＤＩ以外のポリイソシアネートやこれらポリイソシアネートのカルボジイミド変成体、ビウレット変成体、アロファネート変成体、二量体、三量体など、通常のポリウレタンエラストマーの製造に使用されるポリイソシアネートが小量添加されていてもよい。
【００１４】
本発明のイソシアネート基末端プレポリマーは、過剰量の前記ジフェエニルメタンジイソシアネート（Ａ）と数平均分子量が６５０〜５０００のポリオキシテトラメチレングリコール（Ｂ）とを反応させることによって製造される。得られたプレポリマーのイソシアネート基含有量は１．５〜１５質量％が好ましく、特に２〜８質量％が好ましい。イソシアネート基含有量が１．５質量％未満ではプレポリマーの粘度が高くなるため作業性が悪くなり、イソシアネート基含有量が１５質量％を越えると反応性が高くなり得られるエラストマーの表面性が悪くなり、さらに発泡不良も起こりやすくなるため好ましくない。
【００１５】
イソシアネート基末端プレポリマーの合成は、例えば窒素気流下においてポリイソシアネートを撹拌し、これにポリオールを加え、反応温度が７５〜８５℃で１〜数時間程度反応を行うことで得ることができる。なお必要に応じて、未反応のポリイソシアネートモノマーを、例えば蒸留や抽出などの手段を用いて反応液から除去しても良い。
【００１６】
本発明の熱硬化性中硬度ポリウレタンエラストマー組成物の硬化剤は、数平均分子量が６５０〜５０００のポリオキシテトラメチレングリコールとトリメチロールプロパンの混合物を含有する。本発明から得られるエラストマーの架橋点は、硬化剤中のトリメチロールプロパンに起因するので、トリメチロールプロパンの使用量は、架橋剤濃度が０．１０〜０．２５ｍｍｏｌ／ｇｒになるように設定される。
【００１７】
架橋剤濃度が０．１０ｍｍｏｌ／ｇｒ未満のときは、十分に低い圧縮永久歪みが得られなくなり、機械的物性が低下することによる耐久性の劣化が起こるため好ましくない。０．２５ｍｍｏｌ／ｇｒを超えると破断時延びが１００％を切るようになり好ましくない。
【００１８】
なおイソシアネート基末端プレポリマーを主成分とする主剤と上記硬化剤の配合はＮＣＯ基／ＯＨ基当量比で０．８５〜１．２０、好ましくは０．９０〜１．１５である。ＮＣＯ基／ＯＨ基当量比が０．８５より低いと圧縮永久歪みが増大し、さらに未反応成分が残るためブリード等が起こり、表面性が悪くなり好ましくなく、１．２より高いと硬度が上がり、同時に圧縮永久歪みの増大も見られ、さらにイソシアネート基が完全になくなるまでに要する時間がかかるなど生産性が低下し好ましくない。
【００１９】
また本発明の中硬度ポリウレタン組成物およびそれから得られる中硬度ロール又はベルトの製造においては、必要に応じて硬化触媒や種々の添加剤、例えば可塑剤、消泡剤、レベリング剤、艶消し剤、難燃剤、揺変剤、粘着付与剤、増粘剤、滑剤、帯電防止剤、カーボンやリチウム塩等の導電剤、界面活性剤、反応遅延剤、脱水剤、酸化防止剤、紫外線吸収剤、加水分解防止剤、耐候安定剤、染料、無機顔料、有機顔料、体質顔料等を適宜用いることができる。しかしながら可塑剤はブリード現象を引き起こすので実質的に含有されないようにする必要がある。
【００２０】
本発明の中硬度ポリウレタン組成物の成型方法はいわゆる注型用のエラストマーに用いられる成型方法が用いられ、例えば金型を使用する常圧における注型法による場合、金型温度は２５〜１６０℃、好ましくは８０〜１５０℃であり、例えば８０〜１５０℃で０．５〜５時間程度加熱することにより硬化させ、その後８０〜１２０℃で５〜２０時間程度加熱し、架橋反応を行う。なお更に常温で１〜７日エージングし、硬化を完全に進め物性を安定化することが好ましい。金型温度および硬化温度に関しては２５℃以下では反応が遅すぎ、硬化不良になることがあり、１６０℃を越えると反応が早すぎ表面性が悪くなったり、発泡が起こるため好ましくない。
【００２１】
以上から得られる中硬度ポリウレタン組成物およびそれから得られる中硬度ロールは実質的に可塑剤を含まず、ＪＩＳ Ａ硬度で５０〜７５の硬度を有し、１０％圧縮条件下での圧縮永久歪みが十分に低く、１％未満のものが得られ、表面仕上がりも良好であった。
【００２２】
なお本発明の中硬度ポリウレタン組成物の用途としては特に限定されるものではないが各種中硬度のロール類やベルト、衝撃吸収材をはじめポッティング材やシーリング材等に使用できる。
【００２３】
【実施例】
実施例および比較例を用いて本発明をさらに説明するが、これらは本発明の範囲を限定するものではない。なお実施例中、％及び部は質量基準である。
【００２４】
実施例１［ポリウレタンプレポリマーの調製］
数平均分子量１０００のポリオキシテトラメチレングリコール（保土谷化学工業製ＰＴＧ−１０００ＳＮ）の６７０部に、４，４´−ジフェニルメタンジイソシアネート（日本ポリウレタン工業製ミリオネートＭＴ；以下，ＭＴと略記する。）を３３０部加え、窒素気流下、８０℃で６時間撹拌しながら反応させることにより、イソシアネート基含量５．３％、粘度２０００ｍＰａ・ｓ（７５℃）の末端ＮＣＯのポリウレタンプレポリマーを得た。
【００２５】
［硬化剤の調整］
８０℃に予め加温した数平均分子量１０００のポリオキシテトラメチレングリコール（保土谷化学工業製ＰＴＧ−１０００ＳＮ）１００部にトリメチロールプロパン１０部を加え温度を維持して溶解させ、硬化剤を調整した。
【００２６】
上記方法で得られたポリウレタンプレポリマーからなる主剤を８０℃に加熱し、これに８０℃に加熱した硬化剤をＮＣＯ基／ＯＨ基＝１．０となるように加え、２〜３分激しく混合し、５ｍｍＨｇの減圧下で十分に脱泡を行った後に、予め１００℃に加温された外径２０ｍｍ、長さ２００ｍｍのロール用金型と試験片作成用金型に注型した。その後１００℃、１時間で硬化させた後、更に１００℃で１５時間硬化させ、常温で７２時間静置しＪＩＳ Ａ硬度で６６の中硬度ロールと物性測定用シートを得た。
【００２７】
上記と同様の操作で、エンドレスベルト用金型を用いてエンドレスベルトを作成した。
【００２８】
実施例２〜３及び比較例１〜３
実施例と同様に、数平均分子量が異なるポリオキシテトレメチレングリコールとジフェニルメタンじイソシアネートをＮＣＯ基含量が５．３％になるように設定された量比で反応させてポリウレタンプレポリマーを得た。
【００２９】
表中の記号がＭＴ／ＰＴＧ−１５００のものは、
数平均分子量１５００のＰＴＧとＭＴから得られたＮＣＯ基含量＝５．３％のプレポリマー
表中の記号がＭＴ／ＰＴＧ−２０００のものは、
数平均分子量２０００のＰＴＧとＭＴから得られたＮＣＯ基含量＝５．３％のプレポリマー
【００３０】
［硬化剤の調整］
比較例１〜３の硬化剤は、実施例１と同様にして、但しＰＴＧとＴＭＰの量比を表記載の量比として調整した。
【００３１】
表１に記載したポリウレタンプレポリマーからなる主剤と表１に記載した硬化剤をＮＣＯ基／ＯＨ基の当量比が１．０で実施例１に記載の方法と同様の方法で硬化させ中硬度のエラストマーを得た。
【００３２】
また得られた各種エラストマーに対し、以下の物性を測定したので、結果を表１に示す。
エラストマーサンプル形状
ＪＩＳ Ｋ７３１２「熱硬化性ポリウレタンエラストマー成型物の物理試験方法」記載の厚さ１２．５±０．５ｍｍ、直径２９．０±０．５ｍｍの直円柱形とした。
圧縮永久歪み
圧縮率１０％、７０℃×２２時間とし上記サンプルを測定した。
摩擦係数
初期値と普通紙５万枚を送紙した後の値
耐摩耗性
普通紙５万枚を送紙した後の外径の減少量
【００３３】
【表１】
【発明の効果】
本発明によれば、適度の弾性を具備したエラストマーであって、かつ１０％圧縮時の圧縮永久歪みが極めて小さく、作業性に優れた熱硬化型の中硬度ポリウレタン組成物、および該組成物から中硬度ロール又はベルトを得ることができる。本発明のロールは低歪み時の圧縮永久歪みが小さく、耐摩耗性も良好なので、給紙ロールや転写ロールに、導電剤を添加したロールでは帯電ロールや現像ロールに好適に用いることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyurethane composition for elastomers having a small compressive strain, a roll or belt for OA equipment obtained therefrom, and further has an appropriate hardness, an elongation at break of 100 to 300%, and a low strain The present invention relates to a thermosetting polyurethane composition from which an elastomer having a sufficiently low compression set is obtained, and relates to a roll or belt for OA equipment obtained by using the composition.
[0002]
[Prior art]
Polyurethane elastomers are excellent in mechanical strength and abrasion resistance, and are easy to process and the hardness of cured products is 20-100 in JIS A hardness, so there are plenty of variations, such as industrial rolls and belts, automotive parts, It has been used in many fields such as OA equipment members.
Under these circumstances, the demand for urethane elastomers for medium hardness rolls with a JIS A hardness of about 50 to 75 is increasing in recent years. Therefore, elastomers have been evaluated by compression set under 10% compression conditions in line with the substance.
[0003]
[Problems to be solved by the invention]
There is a need for an elastomer that is not a hard elastomer such as 75 to 95 conventionally known, but has a JIS A hardness of 50 to 75 and has substantially no compression set and excellent durability.
[0004]
For example, as a roller that does not contain a plasticizer and has low hardness and low compression set, Japanese Patent Application Laid-Open No. 7-110617 reacts a polyol having a functional group number of 2-3 and an average molecular weight of 1000-3000 with a castor oil-based polyol and an isocyanate. A charging roller using an elastomer as a main elastic layer material has been proposed, and JP-A-8-151423 can be obtained from MDI, modified MDI and polyfunctional polypropylene glycol in a low hardness range of JIS A hardness of 10 or less. There is a proposal for a molded product of a flexible polyurethane elastomer having a compression set of 5% or less.
[0005]
Further, as an improvement in surface tackiness, JP-A-9-114190 proposes a conductive roller obtained by reacting an aliphatic isocyanate and a polyol in which a conductivity-imparting agent is dispersed. Japanese Patent Application Laid-Open No. 9-176269 mainly uses a polyurethane resin containing a urethane bond produced by a polymerization reaction of polyisocyanate and polyol, has an Asker C hardness of 85 ° or less, a compression set of 6% or less, acetone An elastic roller obtained from an elastic material characterized in that the extraction amount is 4% or less has been proposed. However, at present, a urethane elastomer for a medium hardness roll that is sufficiently satisfactory has not been obtained.
[0006]
In view of the above problems, the present invention has a thermosetting medium-hardness polyurethane composition having a JIS A hardness of 50 to 75, sufficiently low compression set, excellent workability, and a product obtained therefrom. It is to provide a hardness roll and a belt.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-110617 [Patent Document 2]
JP-A-8-151423 [Patent Document 3]
JP 9-114190 A [Patent Document 4]
JP-A-9-176269
[Means for Solving the Problems]
The present invention is described in the following (1) to (5).
Invention (1) Main component mainly composed of an isocyanate group-terminated prepolymer obtained by reacting diphenenylmethane diisocyanate (A) with polyoxytetramethylene glycol (B) having a number average molecular weight of 650 to 5000, and a number average A thermosetting composition comprising a curing agent containing a mixture of polyoxytetramethylene glycol having a molecular weight of 650 to 5000 and trimethylolpropane, and having a crosslinking agent concentration of 0.10 to 0.25 mmol / gr. Polyurethane composition.
[0009]
Invention (2) The polyurethane composition as described in (1) whose isocyanate group content of a prepolymer is 1.5-15 mass%.
[0010]
Invention (3) A thermosetting polyurethane composition obtained by reacting the main agent according to (1) or (2) with a curing agent in an equivalent ratio of isocyanate group / hydroxyl group = 0.85 to 1.20.
[0011]
(4) The JIS A hardness is 50 to 75, the elongation at break is 100 to 300%, and the compression set under the condition of a compression rate of 10% is for producing an elastomer having a compression set of less than 1%. The thermosetting polyurethane composition according to any one of the above.
[0012]
(5) Created from the thermosetting polyurethane composition according to any one of (1) to (3), the hardness is 50 to 75 in JIS A hardness, the elongation at break is 100 to 300%, and the compression ratio is 10 Roll or belt for OA equipment with a compression set of less than 1% conditioned.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is a composition composed of two components: a main agent mainly composed of an isocyanate group-terminated prepolymer and a curing agent mainly composed of a polyol.
The isocyanate used as the main component of the main agent is diphenenylmethane diisocyanate (A), and this compound has isomers having different positions to which isocyanate groups (hereinafter sometimes abbreviated as NCO groups) are attached. Exists. Specifically, 2,2′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, and 4,4′-diphenylmethane diisocyanate. Commercially available diphenylmethane diisocyanate (hereinafter sometimes abbreviated as MDI) is a mixture thereof. In the present invention, diphenylmethane diisocyanate in which the 4,4 ′ isomer exceeds 98 mol% is preferably used.
The main component containing (A) is used for the production of ordinary polyurethane elastomers such as polyisocyanates other than MDI, carbodiimide modified products, biuret modified products, allophanate modified products, dimers and trimers of these polyisocyanates. A small amount of polyisocyanate may be added.
[0014]
The isocyanate group-terminated prepolymer of the present invention is produced by reacting an excess amount of the diphenylmethane diisocyanate (A) with a polyoxytetramethylene glycol (B) having a number average molecular weight of 650 to 5000. The isocyanate group content of the obtained prepolymer is preferably 1.5 to 15% by mass, particularly preferably 2 to 8% by mass. When the isocyanate group content is less than 1.5% by mass, the viscosity of the prepolymer increases, so that the workability deteriorates. When the isocyanate group content exceeds 15% by mass, the reactivity increases and the surface properties of the resulting elastomer are poor. Further, poor foaming is likely to occur, which is not preferable.
[0015]
The synthesis of the isocyanate group-terminated prepolymer can be obtained, for example, by stirring the polyisocyanate under a nitrogen stream, adding a polyol thereto, and reacting at a reaction temperature of 75 to 85 ° C. for about 1 to several hours. If necessary, unreacted polyisocyanate monomer may be removed from the reaction solution by means of, for example, distillation or extraction.
[0016]
The curing agent of the thermosetting medium-hardness polyurethane elastomer composition of the present invention contains a mixture of polyoxytetramethylene glycol having a number average molecular weight of 650 to 5000 and trimethylolpropane. Since the crosslinking point of the elastomer obtained from the present invention is attributed to trimethylolpropane in the curing agent, the amount of trimethylolpropane used is set so that the concentration of the crosslinking agent is 0.10 to 0.25 mmol / gr. The
[0017]
When the concentration of the crosslinking agent is less than 0.10 mmol / gr, it is not preferable because sufficiently low compression set cannot be obtained and durability deteriorates due to deterioration of mechanical properties. If it exceeds 0.25 mmol / gr, the elongation at break becomes less than 100%, which is not preferable.
[0018]
The blending of the main agent mainly composed of an isocyanate group-terminated prepolymer and the curing agent is an NCO group / OH group equivalent ratio of 0.85 to 1.20, preferably 0.90 to 1.15. If the NCO group / OH group equivalent ratio is lower than 0.85, compression set increases, and further unreacted components remain, causing bleeding and the like, which is not preferable, and if it is higher than 1.2, the hardness increases. At the same time, an increase in compression set is also observed, and further, it takes time to completely eliminate the isocyanate group.
[0019]
Further, in the production of the medium hardness polyurethane composition of the present invention and the medium hardness roll or belt obtained therefrom, a curing catalyst and various additives such as a plasticizer, an antifoaming agent, a leveling agent, a matting agent, Flame retardants, thixotropic agents, tackifiers, thickeners, lubricants, antistatic agents, conductive agents such as carbon and lithium salts, surfactants, reaction retarders, dehydrating agents, antioxidants, UV absorbers, water Decomposition inhibitors, weathering stabilizers, dyes, inorganic pigments, organic pigments, extender pigments and the like can be used as appropriate. However, since the plasticizer causes a bleed phenomenon, it must be substantially not contained.
[0020]
The molding method of the medium-hardness polyurethane composition of the present invention is a molding method used for so-called casting elastomers. For example, in the case of the casting method at normal pressure using a mold, the mold temperature is 25 to 160 ° C. It is preferably 80 to 150 ° C., for example, cured by heating at 80 to 150 ° C. for about 0.5 to 5 hours, and then heated at 80 to 120 ° C. for about 5 to 20 hours to carry out a crosslinking reaction. Furthermore, it is preferable to age at room temperature for 1 to 7 days to completely cure and stabilize the physical properties. With respect to the mold temperature and the curing temperature, the reaction is too slow at 25 ° C. or lower and the curing may be poor, and if it exceeds 160 ° C., the reaction is too early and the surface property is deteriorated or foaming is not preferable.
[0021]
The medium-hardness polyurethane composition obtained from the above and the medium-hardness roll obtained therefrom have substantially no plasticizer, have a JIS A hardness of 50 to 75, and have a compression set under 10% compression conditions. It was sufficiently low and less than 1% was obtained, and the surface finish was also good.
[0022]
The use of the medium-hardness polyurethane composition of the present invention is not particularly limited, but it can be used for various medium-hardness rolls, belts, impact absorbing materials, potting materials, sealing materials, and the like.
[0023]
【Example】
The present invention will be further described with reference to examples and comparative examples, but these do not limit the scope of the present invention. In the examples,% and parts are based on mass.
[0024]
Example 1 [Preparation of polyurethane prepolymer]
330 parts of 4,4′-diphenylmethane diisocyanate (Millionate MT manufactured by Nippon Polyurethane Industry; hereinafter abbreviated as MT) are added to 670 parts of polyoxytetramethylene glycol having a number average molecular weight of 1000 (PTG-1000SN manufactured by Hodogaya Chemical Co., Ltd.). A polyurethane prepolymer of terminal NCO having an isocyanate group content of 5.3% and a viscosity of 2000 mPa · s (75 ° C.) was obtained by adding a part and reacting with stirring at 80 ° C. for 6 hours in a nitrogen stream.
[0025]
[Adjustment of curing agent]
A curing agent was prepared by adding 10 parts of trimethylolpropane to 100 parts of polyoxytetramethylene glycol (PTG-1000SN manufactured by Hodogaya Chemical Industry) with a number average molecular weight of 1000 preheated to 80 ° C., maintaining the temperature and dissolving. .
[0026]
The main component made of the polyurethane prepolymer obtained by the above method is heated to 80 ° C., and the curing agent heated to 80 ° C. is added so that NCO group / OH group = 1.0, and mixed vigorously for 2 to 3 minutes. Then, after sufficiently defoaming under a reduced pressure of 5 mmHg, it was poured into a roll mold and a test piece preparation mold having an outer diameter of 20 mm and a length of 200 mm, which had been heated to 100 ° C. in advance. Thereafter, it was cured at 100 ° C. for 1 hour, further cured at 100 ° C. for 15 hours, and allowed to stand at room temperature for 72 hours to obtain a medium hardness roll of 66 JIS A hardness and a sheet for measuring physical properties.
[0027]
An endless belt was produced using an endless belt mold by the same operation as described above.
[0028]
Examples 2-3 and Comparative Examples 1-3
In the same manner as in the Examples, a polyoxytetremethylene glycol having a different number average molecular weight and diphenylmethane diisocyanate were reacted in a quantitative ratio set so that the NCO group content was 5.3% to obtain a polyurethane prepolymer.
[0029]
When the symbol in the table is MT / PTG-1500,
NCO group content obtained from PTG having a number average molecular weight of 1500 and MT = 5.3% of prepolymer The symbol in the table is MT / PTG-2000,
NCO group content obtained from number average molecular weight 2000 PTG and MT = prepolymer with 5.3%
[Adjustment of curing agent]
The curing agents of Comparative Examples 1 to 3 were prepared in the same manner as in Example 1, except that the amount ratio of PTG and TMP was adjusted as the amount ratio described in the table.
[0031]
The main agent composed of the polyurethane prepolymer described in Table 1 and the curing agent described in Table 1 were cured by the same method as described in Example 1 with an NCO group / OH group equivalent ratio of 1.0. An elastomer was obtained.
[0032]
Moreover, since the following physical properties were measured with respect to the obtained various elastomers, the results are shown in Table 1.
Elastomer sample shape A right circular cylinder having a thickness of 12.5 ± 0.5 mm and a diameter of 29.0 ± 0.5 mm described in JIS K7312 “Physical test method for thermosetting polyurethane elastomer molding” was used.
The sample was measured with a compression set of 10% and 70 ° C. × 22 hours.
Initial value of friction coefficient and value after feeding 50,000 sheets of plain paper Amount of decrease in outer diameter after feeding 50,000 sheets of plain paper
[Table 1]
【The invention's effect】
According to the present invention, a thermosetting medium-hardness polyurethane composition that is an elastomer having moderate elasticity, has a very small compression set upon 10% compression, and has excellent workability, and the composition. Medium hardness rolls or belts can be obtained. Since the roll of the present invention has a small compression set at low strain and good wear resistance, a roll in which a conductive agent is added to a paper feed roll or a transfer roll can be suitably used as a charging roll or a developing roll.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003165199A JP4474675B2 (en) | 2003-06-10 | 2003-06-10 | Thermosetting polyurethane composition and roll or belt for OA equipment obtained using the composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003165199A JP4474675B2 (en) | 2003-06-10 | 2003-06-10 | Thermosetting polyurethane composition and roll or belt for OA equipment obtained using the composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005002169A true JP2005002169A (en) | 2005-01-06 |
| JP4474675B2 JP4474675B2 (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003165199A Expired - Lifetime JP4474675B2 (en) | 2003-06-10 | 2003-06-10 | Thermosetting polyurethane composition and roll or belt for OA equipment obtained using the composition |
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| Country | Link |
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| JP (1) | JP4474675B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007046201A (en) * | 2005-08-11 | 2007-02-22 | Teijin Techno Products Ltd | Method for producing aromatic polyamide fiber for reinforcing resin belt |
| JP2007146093A (en) * | 2005-10-24 | 2007-06-14 | Mitsuboshi Belting Ltd | Polyurethane resin composition and formed polyurethane article produced by using the same |
| JP2012149735A (en) * | 2011-01-20 | 2012-08-09 | Sumitomo Rubber Ind Ltd | Oa roller, and coating agent for the same |
-
2003
- 2003-06-10 JP JP2003165199A patent/JP4474675B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007046201A (en) * | 2005-08-11 | 2007-02-22 | Teijin Techno Products Ltd | Method for producing aromatic polyamide fiber for reinforcing resin belt |
| JP4647430B2 (en) * | 2005-08-11 | 2011-03-09 | 帝人テクノプロダクツ株式会社 | Method for producing aromatic polyamide fiber for reinforcing thermosetting urethane resin belt |
| JP2007146093A (en) * | 2005-10-24 | 2007-06-14 | Mitsuboshi Belting Ltd | Polyurethane resin composition and formed polyurethane article produced by using the same |
| JP2012149735A (en) * | 2011-01-20 | 2012-08-09 | Sumitomo Rubber Ind Ltd | Oa roller, and coating agent for the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4474675B2 (en) | 2010-06-09 |
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