JP6707468B2 - 成形品の曲げ靭性を改良する方法 - Google Patents
成形品の曲げ靭性を改良する方法 Download PDFInfo
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- JP6707468B2 JP6707468B2 JP2016568863A JP2016568863A JP6707468B2 JP 6707468 B2 JP6707468 B2 JP 6707468B2 JP 2016568863 A JP2016568863 A JP 2016568863A JP 2016568863 A JP2016568863 A JP 2016568863A JP 6707468 B2 JP6707468 B2 JP 6707468B2
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- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
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Description
ポリ(1,3−ジオキセパン)を使用するときは、大抵の場合、曲げ弾性率に対する影響はわずかであるが、破断点伸びについては、明らかに、増加させるものである。この結果、曲げ靱性が増大することになる。
B.)以下のものからなる混合物を含むバインダー30〜60体積%;
B1.)50〜97質量%(成分Bの合計量に対して)の1種又はそれ以上のポリオキシメチレンホモポリマー又はコポリマー;
B2.)2〜35質量%(成分Bの合計量に対して)の1種又はそれ以上のポリオレフィン;
B3.)1〜40質量%(成分Bの合計量に対して)のポリ−1,3−ジオキソラン、ポリ−1,3−ジオキセパン、ポリテトラヒドロフラン又はこれらの混合物(B1.)、B2.)及びB3.)の総量が100質量%になるまで加える)
B2.)2〜35質量%の1種又はそれ以上のポリオレフィン;
B3.)1〜40質量%のポリ−1,3−ジオキソラン、ポリ−1,3−ジオキセパン、ポリテトラヒドロフラン又はこれらの混合物、
(各数値は成分Bの合計量に対するものであり、また、B1.)、B2.)及びB3.)の総量が100質量%になるまで加える)
− 成分B1.1としては、10〜90質量%のポリオキシメチレンホモポリマー又はコポリマーで60,000g/molを超えて200,000g/molまでの範囲の質量平均モル質量(Mw)を有するものであり、
− 成分B1.2としては、10〜90質量%のポリオキシメチレンコポリマーで10,000〜60,000g/molの範囲の質量平均モル質量(Mw)を有するものである。
成分B1について、より詳細に以下に記載する。
POMオリゴマー及びポリマーの製造
実験室規模の重合を、循環トレイプロセスをシミュレートした方法で行った。モノマー及び調節剤の加熱を、磁気撹拌しながら、開放した鉄又はアルミニウム反応器中で80℃まで行った。ここでの混合物は透明な液体であった。接合部t=0において、ブチルジグリム中HClO4から構成した開始剤溶液を注入した。そのプロトン濃度はモノマーに対して典型的には0.05ppmであり、あるいは、より多量のコモノマーを含有するPOMに対しては、それに対応して、一層高濃度である。重合が達成すると、当該混合物は短時間(典型的には数秒〜1分の範囲の誘導時間)で濁り、ポリマーが沈殿した。
生のポリ(オキシメチレン)を微粉に粉砕し、0.01質量%グリセロリン酸ナトリウム及び0.05質量%四ホウ酸ナトリウム緩衝水溶液をスプレーした。
回転レオロジー測定を、Rheometric Scientific社製SR2回転式レオメータを使用して行った。プレートの寸法を直径25mm及びプレート間隔0.8〜1mmに設定した。測定は190℃及び15分の時間で行った。周波数掃引測定を行い、10rad/sの周波数での複素粘度を第2掃引で記録した。
ポリマーのモル質量は、SEC装置内でサイズ排除クロマトグラフィーによって測定した。このSEC装置は、次の分離カラムの組合せ、すなわち、長さ5cm及び直径7.5mmの予備カラムと長さ30cm及び直径7.5mmの第2の直線カラムとの組合せからなるものであった。両方のカラム内の分離材料は、Polymer Laboratories社製のPL‐HFIPゲルであった。使用した検出器は、アジレント(Agilent)G1362Aからの示差屈折計を具備している。ヘキサフルオロイソプロパノールと0.05%のトリフルオロ酢酸カリウムとの混合物を溶離剤として使用した。流速は0.5ml/分であり、カラム温度は40℃であった。1リットルの溶離液につき試料1.5gの濃度で60マイクロリットルの溶液を注入した。この試料溶液は、ミリポア・マイレクス(Millipor Millex) GF(孔の幅0.2マイクロメートル)を介して予め濾過しておいた。モル質量Mが505〜2,740,000g/molであるPSS(マインツ、ドイツ)社製の分布が狭いPMMA標準試料を較正に使用した。
DSMミニ押出機で緩衝ポリマーを加工処理した後、寸法(10×4×8mm)を有する切り欠き(ノッチ)のないシャルピー・バー(charpy bar)を射出した。そのポリマーを80rpmのスクリュー速度で2回それぞれ2分間押出した。これらのバーを試験片として用い、ISO178:2010試験を使用して、曲げ弾性率、並びに曲げ引張における破断時の応力及び伸びを測定した。屈曲速度は2mm/分に設定した。試験は室温(23℃)で行った。
高分子量(HMW)POM: このPOMは0.35質量%のブチル含量で製造したものである。数平均分子量は23000g/molであり、質量平均分子量は94000g/molである。Mw/Mn比は4.2であり、10rad/sにおける粘度は200Pa・sであり、MFIは42〜43cm3/10minである。ブタンジオールホルマールコモノマーの割合は、ポリマーに対して2.7質量%であった。開始剤の濃度は、モノマーに対して0.05ppmであった。
比較例C1では、高分子量POMのみを使用している。比較例2は、高分子量POMとオリゴマーPOMとの混合物を使用している。本発明に係る実施例1は、高分子量POM、オリゴマーPOM及びポリBUFOを使用している。
表3に示すような更に別の各種組成物について評価した。第一の試験系列と同様に、金属充填(91.27質量%)した成形材料の機械的特性を測定した。
Claims (11)
- 成形材料から形成する成形品の曲げ靭性を改良する方法であって、ポリオキシメチレン又はコポリマー中に存在する繰り返し単位の数のうち50%を超える繰り返し単位がオキシメチレン単位である当該コポリマーを含む成形材料中に、該成形材料から形成する成形品の曲げ靭性を改良するため、ポリ−1,3−ジオキセパン、ポリ−1,3−ジオキソラン、ポリテトラヒドロフラン又はこれらの混合物を導入する工程を含み、20,000〜200,000g/molの範囲の質量平均モル質量(Mw)を有するポリオキシメチレンコポリマーであって、ポリオキシメチレンコポリマーに対して少なくとも90質量%が、モノマーとしてのトリオキサン及び1,3−ジオキセパン及び調節剤としてのブチラールから誘導され、1,3−ジオキセパンの割合がポリオキシメチレンコポリマーに対して1〜30質量%の範囲であり、またブチラールの割合がポリオキシメチレンコポリマーに対して0.01〜2.5質量%の範囲にある(質量%はポリオキシメチレンコポリマーに対するものである)ものを使用し、分子量をゲル浸透クロマトグラフィー又はサイズ排除クロマトグラフィーによって測定することを特徴とする方法。
- 成形材料から形成する成形品の曲げ靭性を改良することには、破断点伸びを増大させることを含む請求項1に記載の方法。
- ポリ−1,3−ジオキセパン、ポリ−1,3−ジオキソラン、ポリテトラヒドロフラン又はこれらの混合物を、ポリオキシメチレン又はコポリマー中に存在する繰り返し単位の数のうち50%を超える繰り返し単位がオキシメチレン単位である当該コポリマー、及びポリ−1,3−ジオキセパン、ポリ−1,3−ジオキソラン、ポリテトラヒドロフラン又はこれらの混合物の総量に対して、1〜16質量%の量で使用する請求項1又は2に記載の方法。
- 質量平均分子量が10000〜150000g/molのポリ−1,3−ジオキセパンを使用する請求項1〜3のいずれか一項に記載の方法。
- 前記ポリオキシメチレンコポリマーの質量平均モル質量(Mw)が、30,000〜60,000g/mol、及び/又は数平均モル質量(Mn)が5,000〜18,000g/molである請求項1に記載の方法。
- 前記ポリオキシメチレンコポリマーのMw/Mn比が3〜5の範囲にある請求項5に記載の方法。
- 前記成形材料が混合物を含むものであって、
成分B1.1として10〜90質量%のポリオキシメチレンホモポリマー又はコポリマーで60,000g/molを超えて200,000g/molまでの範囲の質量平均モル質量(Mw)を有するもの、
及び
成分B1.2として10〜90質量%のポリオキシメチレンコポリマーで10,000〜60,000g/molの範囲の質量平均モル質量(Mw)を有するもの
を含むものである請求項1〜4のいずれか一項に記載の方法。 - ポリマーに対して少なくとも90質量%の成分B1.1は、モノマーとしてのトリオキサン及び任意の1,3−ジオキセパンから誘導されるものであって、1,3−ジオキセパンの割合が、ポリマーに対して1〜5質量%である請求項7に記載の方法。
- ポリマーに対して少なくとも90質量%の成分B1.2は、モノマーとしてのトリオキサン及び任意 1,3−ジオキセパンから誘導されるものであって、1,3−ジオキセパンの割合が、ポリマーに対して2.7〜30質量%である請求項7又は8に記載の方法。
- A.)焼結可能な粉砕金属又は焼結可能な粉砕金属合金又は焼結可能な粉砕セラミック又はこれらの混合物40〜70体積%;
B.)下記のものからなる混合物を含むバインダー30〜60体積%;
B1.)50〜97質量%(成分Bの合計量に対して)の1種又はそれ以上のポリオキシメチレンホモポリマー又はコポリマー;
B2.)2〜35質量%(成分Bの合計量に対して)の1種又はそれ以上のポリオレフィン;
B3.)1〜40質量%(成分Bの合計量に対して)のポリ−1,3−ジオキソラン、ポリ−1,3−ジオキセパン、ポリテトラヒドロフラン又はこれらの混合物(B1.)、B2.)及びB3.)の総量が100質量%になるまで加える);
を含む成形材料を使用する請求項1〜9のいずれか一項に記載の方法。 - 成分B1.1として、10〜90質量%のポリオキシメチレンホモポリマー又はコポリマーで60,000g/molを超えて200,000g/molまでの範囲の質量平均モル質量(Mw)を有するものと、成分B1.2として、10〜90質量%のポリオキシメチレンコポリマーで10,000〜60,000g/molの範囲の質量平均モル質量(Mw)を有するものとを含む異なるポリオキシメチレンホモポリマー又はコポリマーの混合物を含む成形材料から形成する成形品の曲げ靭性を改良する方法であって、該成形材料中にポリ−1,3−ジオキセパン、ポリ−1,3−ジオキソラン、ポリテトラヒドロフラン又はこれらの混合物を含ませる工程を包含することを特徴とする方法。
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