JP5847261B1 - ポリアセタール樹脂組成物及び摺動部材 - Google Patents
ポリアセタール樹脂組成物及び摺動部材 Download PDFInfo
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- JP5847261B1 JP5847261B1 JP2014198326A JP2014198326A JP5847261B1 JP 5847261 B1 JP5847261 B1 JP 5847261B1 JP 2014198326 A JP2014198326 A JP 2014198326A JP 2014198326 A JP2014198326 A JP 2014198326A JP 5847261 B1 JP5847261 B1 JP 5847261B1
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- USDJGQLNFPZEON-UHFFFAOYSA-N [[4,6-bis(hydroxymethylamino)-1,3,5-triazin-2-yl]amino]methanol Chemical compound OCNC1=NC(NCO)=NC(NCO)=N1 USDJGQLNFPZEON-UHFFFAOYSA-N 0.000 description 1
- NJYZCEFQAIUHSD-UHFFFAOYSA-N acetoguanamine Chemical compound CC1=NC(N)=NC(N)=N1 NJYZCEFQAIUHSD-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
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Abstract
Description
本発明のポリアセタール樹脂組成物は、(A)ポリアセタール樹脂と、(B)ヒンダードフェノール系酸化防止剤と、(C)窒素含有化合物と、(D)変性オレフィン系重合体と、(E)アルキレングリコール系重合体と、(F)炭酸カルシウムと、(G)多価アルコールの部分エステルと、(H)アルファオレフィンオリゴマーとを含有する。以下、各々の成分について説明する。
本発明に係るポリアセタール樹脂組成物は、(A)ポリアセタール樹脂を含有する。以下、(A)ポリアセタール樹脂を「(A)成分」ともいう。
本発明に係るポリアセタール樹脂組成物は、(B)ヒンダードフェノール系酸化防止剤を含有する。以下、(B)ヒンダードフェノール系酸化防止剤を「(B)成分」ともいう。
本発明に係るポリアセタール樹脂組成物は、(C)窒素含有化合物を含有する。以下、(C)窒素含有化合物を「(C)成分」ともいう。
本発明に係るポリアセタール樹脂組成物は、(D)不飽和カルボン酸、前記不飽和脂肪酸の酸無水物及びこれらの誘導体から選択される少なくとも一種によって(d)オレフィン系重合体が変性された変性オレフィン系重合体を含有する。ポリアセタール樹脂組成物がオレフィン系重合体を含有するとしても、このオレフィン系重合体が変性オレフィン系重合体でない場合、ポリアセタール樹脂組成物を含む樹脂成形体の耐剥離性及び摺動性が劣るため、好ましくない。以下、上記変性オレフィン系重合体を「(D)成分」ともいう。
本発明に係るポリアセタール樹脂組成物は、(E)1級アミノ基又は2級アミノ基を有し、数平均分子量が400以上500,000以下であるアルキレングリコール系重合体を含有する。以下、このアルキレングリコール系重合体を「(E)成分」ともいう。
本発明に係るポリアセタール樹脂組成物は、(F)BET比表面積が15m2/g以下であり、平均粒子径が50nm以上200nm以下であり、表面未処理であり、略立方体状である炭酸カルシウムを含有する。以下、この炭酸カルシウムを「(F)成分」ともいう。
本発明に係るポリアセタール樹脂組成物は、(G)2価以上4価以下の多価アルコールの部分エステルを含有する。以下、この部分エステルを「(G)成分」ともいう。
本発明に係るポリアセタール樹脂組成物は、(H)アルファオレフィンオリゴマーを含有する。以下、このオリゴマーを「(H)成分」ともいう。
本発明に係るポリアセタール樹脂組成物は、公知の各種安定剤をさらに添加して安定性を補強することができる。また、目的とする用途に応じてその物性を改善するために、公知の各種の添加剤をさらに配合し得る。
本発明に係るポリアセタール樹脂組成物の調製は、従来の樹脂組成物調製法として一般に用いられる公知の方法により容易に調製される。例えば、(1)組成物を構成する全成分を混合し、これを押出機に供給して溶融混練し、ペレット状の組成物を得る方法、(2)組成物を構成する成分の一部を押出機の主フィード口から、残余成分をサイドフィード口から供給して溶融混練し、ペレット状の組成物を得る方法、(3)押出し等により一旦組成の異なるペレットを調製し、そのペレットを混合して所定の組成に調整する方法等を採用できる。
本発明に係る摺動部材は、上記のポリアセタール樹脂組成物を含む樹脂成形体からなる。この摺動部材は、摩擦・摩耗特性、対金属摺動のみならず対樹脂摺動にも優れ、また、樹脂成形品の表面の美観に係る表面性、耐剥離性にも優れるため、AV、OA分野、測定器分野の諸摺動部品に好適に用いられる。
はない。
(A)ポリアセタール樹脂
トリオキサン96.7重量%と1,3−ジオキソラン3.3重量%とを共重合させてなるポリアセタール共重合体(メルトインデックス(190℃,荷重2160gで測定):27g/10min)
(B)ヒンダードフェノール系酸化防止剤
テトラキス[メチレン3(3,5ジtブチル4ヒドロキシフェニル)プロピオネート]メタン(製品名:Irganox 1010,BASFジャパン社製)
(C)窒素含有化合物
メラミン(三井化学社製)
(D)変性オレフィン系重合体
(D−1)無水マレイン酸変性低密度ポリエチレン(LDPE)(製品名:タフマーMM6850,三井化学社製)
(D−2)無水マレイン酸変性エチレン−アクリル酸エチルコポリマー(EEA)(製品名:HPR AR2011,三井デュポンポリケミカル社製)
(E)1級アミノ基又は2級アミノ基を有し、数平均分子量が400以上500,000以下であるアルキレングリコール系重合体
(E−1)両末端アミン変性ポリエチレングリコール(PEG)(製品名:ケミスタットY−400,数平均分子量:4,000,三洋化成工業社製)
(F)BET比表面積が15m2/g以下であり、平均粒子径が50nm以上200nm以下であり、表面未処理であり、略立方体状である炭酸カルシウム
(F−1)BET比表面積が11.5m2/gであり、平均粒子径が150nmであり、表面未処理であり、略立方体状である炭酸カルシウム(製品名:Brilliant1500,膠質の炭酸カルシウム,白石工業社製)
(F’)他の炭酸カルシウム
(F’−1)BET比表面積が2.5m2/gであり、平均粒子径が1800nmであり、表面未処理であり、不定形である炭酸カルシウム(製品名:ホワイトンP−30,膠質の炭酸カルシウム,白石工業社製)
(F’−2)BET比表面積が11.5m2/gであり、平均粒子径が150nmであり、有機酸で表面処理されており、略立方体状である炭酸カルシウム(製品名:Vigot15(表面処理品),膠質の炭酸カルシウム,白石工業社製)
(F’−3)BET比表面積が18m2/gであり、平均粒子径が80nmであり、表面未処理であり、略立方体状である炭酸カルシウム(製品名:白艶華CC−R,白石工業社製)
(G)多価アルコールの部分エステル
(G−1)グリセリンモノステアレート(製品名:リケマールS100,理研ビタミン社製)
(G’)他のエステル
(G’−1)ステアリルステアレート(製品名:ユニスターM9676,日油社製)
(G’−2)グリセリントリステアレート(製品名:ポエムS95,理研ビタミン社製)
(H)アルファオレフィンオリゴマー
アルファオレフィンオリゴマー(製品名:ルーカントHC600,三井化学社製)
上記ペレット状の組成物を、シリンダー温度:200℃、金型温度:40℃、射出速度:4.0m/minで50×50×1mmt φ1mmピンゲート成形品を成形した。そして、ピンゲート成形品の表面を目視にて観察した。外観の不良が見られない場合を“○”とし、ジェッティングやアバタ等、外観の不良が見られた場合を“×”とした。結果を表3に示す。
上記ピンゲート成形品の成形直後に上記ピンゲート成形品を折り曲げ、剥離の状況を確認した。剥離や白化が認められなかった場合を“○”とし、剥離は認められなかったが、部分的な白化が認められた場合を“△”とし、剥離が認められたか、又は全面的に白化した場合を“×”とした。結果を表3に示す。
上記ペレット状の組成物を、シリンダー温度:200℃、金型温度:40℃、射出速度:4.0m/minで50×50×1mmt φ1mmピンゲート成形品を成形した。そして、ピンゲート成形品の表面を目視にて観察した。外観の不良が見られない場合を“○”とし、ジェッティングやアバタ等、外観の不良が見られた場合を“×”とした。結果を表3に示す。
上記ペレット状の組成物を、金型温度80℃、シリンダー温度200℃で射出成形することによって得られた試験片に対し、鈴木式摩擦摩耗試験にしたがって、荷重:0.06MPa、速度:15cm/s、相手材:ポリアセタール樹脂成形品、走行時間:24時間の条件にて、動摩擦係数及び比摩耗量を評価した。結果を表3に示す。なお、相手材は、実施例及び比較例で使用した(A)ポリアセタール樹脂100質量部と、(B)ヒンダードフェノール系酸化防止剤0.25質量部と、(C)窒素含有化合物0.07質量部からなる樹脂組成物を、金型温度80℃、シリンダー温度200℃で射出成形することによって得られたポリアセタール樹脂成形体である。
試験片の摩擦係数が0.3未満であり、かつ、試験片の比摩耗量が1.0×10−2mm3/(N・km)以下である場合を“○”とし、そうでない場合を“×”とした。結果を表3に示す。
Claims (2)
- (A)ポリアセタール樹脂100質量部と、
(B)ヒンダードフェノール系酸化防止剤0.01質量部以上1質量部以下と、
(C)窒素含有化合物0.05質量部以上1質量部以下と、
(D)不飽和カルボン酸、不飽和脂肪酸の酸無水物及びこれらの誘導体から選択される少なくとも一種によってオレフィン系重合体が変性された変性オレフィン系重合体0.5質量部以上10質量部以下と、
(E)1級アミノ基又は2級アミノ基を有し、数平均分子量が400以上500,000以下であるアルキレングリコール系重合体0.01質量部以上5質量部以下と、
(F)BET比表面積が15m2/g以下であり、平均粒子径が50nm以上200nm以下であり、表面未処理であり、略立方体状である炭酸カルシウム0.1質量部以上20質量部以下と、
(G)2価以上4価以下の多価アルコールの部分エステル0.1質量部以上10質量部以下と、
(H)アルファオレフィンオリゴマー0.1質量部以上10質量部以下とを含有するポリアセタール樹脂組成物。 - 請求項1に記載のポリアセタール樹脂組成物を含む樹脂成形体からなる摺動部材。
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US20180282650A1 (en) * | 2017-03-31 | 2018-10-04 | Polyplastics Co., Ltd. | Dust-resistant sliding member and method for producing same, window regulator carrier plate, and method for realizing dust-resistant slidability |
US10174270B1 (en) * | 2017-09-28 | 2019-01-08 | Polyplastics Co., Ltd. | Dust-resistant sliding member and method for producing same, window regulator carrier plate, and method for realizing dust-resistant slidability |
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