JP2019181913A - 混練方法および混練物 - Google Patents
混練方法および混練物 Download PDFInfo
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- JP2019181913A JP2019181913A JP2018109050A JP2018109050A JP2019181913A JP 2019181913 A JP2019181913 A JP 2019181913A JP 2018109050 A JP2018109050 A JP 2018109050A JP 2018109050 A JP2018109050 A JP 2018109050A JP 2019181913 A JP2019181913 A JP 2019181913A
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- raw material
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- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/84—Venting or degassing ; Removing liquids, e.g. by evaporating components
- B29B7/845—Venting, degassing or removing evaporated components in devices with rotary stirrers
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- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
Description
本実施例1では、高せん断加工装置1000における第1の押出機2に、材料を投入し、第1の押出機2で予備混練された原料を第2の押出機3で混練し、第3の押出機(脱泡機)4で脱泡することで、混練物を得た。
・スクリュ21の径(外径):48mm
・スクリュ21の有効長(L/D):6.25
・スクリュ21の周速度:0.63m/s
・通路88の内径:3mm
・通路88の数:2本
・第2の押出機3への原料供給量(押出質量):5kg/h
・バレル設定温度:200℃
・なお、第1の押出機2には、東芝機械製二軸押出機 TEM−26SX(スクリュ呼び径26mm)を使用し、スクリュ7a、7bのフライト14、ディスク15、フライト16は、材料の溶融を主とする構成とした。
上記装置条件および混練条件で、第2の押出機3により原料を混練することで、混練物1を作製した。
<機械的物性の評価>
本実施例1で作製した混練物1について、機械的物性の評価を行った。なお、機械的物性の評価では、第2の押出機3を用いて上記装置条件および上記混練条件で作製した混練物1について、第3の押出機(脱泡機)4によって脱泡した後の混練物1を用いて、機械的物性の評価を行った。
本実施例1で作製した混練物1における、PPの分散度を評価した。PPの分散度の評価は、画像解析により行った。
実施例1におけるスクリュ本体37の周速度を1.26m/sとした点以外は、実施例1と同じ装置条件および混練条件で第2の押出機3を用いて原料を混練し、混練物として、混練物2を作製した。そして、実施例1と同様に、第3の押出機(脱泡機)4によって脱泡した後の混練物2を用いて、実施例1と同じ条件で、機械的物性の評価を行った。評価結果を図11に示した。
実施例1におけるスクリュ本体37の周速度を1.88m/sとした点以外は、実施例1と同じ装置条件および混練条件で第2の押出機3を用いて原料を混練し、混練物として、混練物3を作製した。そして、実施例1と同様に、第3の押出機(脱泡機)4によって脱泡した後の混練物3を用いて、実施例1と同じ条件で、機械的物性の評価を行った。評価結果を図11に示した。
実施例1において、第2の押出機3の押出質量を10kg/hとし、スクリュ本体37の周速度を2.51m/sとした点以外は、実施例1と同じ装置条件および混練条件で第2の押出機3を用いて原料を混練し、混練物として、混練物4を作製した。そして、実施例1と同様に、第3の押出機(脱泡機)4によって脱泡した後の混練物4を用いて、実施例1と同じ条件で、機械的物性の評価を行った。評価結果を図11に示した。
実施例1で用いた第2の押出機3について、通路88を備えない構成の第2の押出機3を用い、且つ、スクリュ本体37の周速度を0.38m/sとした点以外は、実施例1と同じ装置条件および混練条件で第2の押出機3を用いて原料を混練し、比較混練物1を作製した。そして、実施例1と同様に、第3の押出機(脱泡機)4によって脱泡した後の比較混練物1を用いて、実施例1と同じ条件で、機械的物性の評価を行った。評価結果を図11に示した。
実施例1で用いた第2の押出機3について、通路88を備えない構成の第2の押出機3を用い、且つ、スクリュ本体37の周速度を0.63m/sとした点以外は、実施例1と同じ装置条件および混練条件で第2の押出機3を用いて原料を混練し、比較混練物2を作製した。そして、実施例1と同様に、第3の押出機(脱泡機)4によって脱泡した後の比較混練物2を用いて、実施例1と同じ条件で、機械的物性の評価を行った。評価結果を図11に示した。
実施例1で用いた第2の押出機3について、通路88を備えない構成の第2の押出機3を用い、且つ、スクリュ本体37の周速度を1.26m/sとした点以外は、実施例1と同じ装置条件および混練条件で第2の押出機3を用いて原料を混練し、比較混練物3を作製した。そして、実施例1と同様に、第3の押出機(脱泡機)4によって脱泡した後の比較混練物3を用いて、実施例1と同じ条件で、機械的物性の評価を行った。評価結果を図11に示した。
実施例1で用いた第2の押出機3について、通路88を備えない構成の第2の押出機3を用い、且つ、スクリュ本体37の周速度を1.88m/sとした点以外は、実施例1と同じ装置条件および混練条件で第2の押出機3を用いて原料を混練し、比較混練物4を作製した。そして、実施例1と同様に、第3の押出機(脱泡機)4によって脱泡した後の比較混練物4を用いて、実施例1と同じ条件で、機械的物性の評価を行った。評価結果を図11に示した。
実施例1で用いた第2の押出機3について、通路88を備えない構成の第2の押出機3を用い、且つ、スクリュ本体37の周速度を2.51m/sとした点以外は、実施例1と同じ装置条件および混練条件で第2の押出機3を用いて原料を混練し、比較混練物5を作製した。そして、実施例1と同様に、第3の押出機(脱泡機)4によって脱泡した後の比較混練物5を用いて、実施例1と同じ条件で、機械的物性の評価を行った。評価結果を図11に示した。
材料を、比較例6の比較混練物6として用いた。そして、実施例1と同じ条件で、機械的物性の評価を行った。評価結果を図11に示した。
図11に示すように、実施例1〜実施例4で作製した混練物1〜混練物4は、比較例1〜比較例3で作製した比較混練物1〜比較混練物3および材料である比較混練物6に比べて、シャルピー計測値およびシャルピー衝撃強度の相対値が高かった。詳細には、比較混練物1のシャルピー計測値が18.49kj/m2であるのに対して、実施例1〜実施例4で作製した混練物1〜混練物4のシャルピー計測値は、全て、比較混練物1のシャルピー計測値を越える18.5kj/m2以上の値を示した。なお、比較混練物4および比較混練物5は、混練工程において原料の温度が実施例1〜実施例4に比べて急激に上昇して熱劣化し、シャルピー衝撃強度を測定することは出来なかった。
21 スクリュ
37 スクリュ本体
81 搬送部
82 障壁部
88 通路
53 搬送路
Claims (8)
- 押出機のスクリュによって、原料を混練しつつ搬送し、生成された混練物を連続的に吐出する混練方法であって、
前記スクリュは、
前記原料の搬送方向に沿った直線状の軸線を中心に回転するスクリュ本体と、
前記スクリュ本体の軸方向に沿って設けられ、前記スクリュ本体の回転に伴って、前記原料を前記スクリュ本体の周方向に亘る外周面に沿って軸方向に搬送する搬送部と、
前記スクリュ本体に設けられ、前記搬送部と隣り合った位置で前記原料の軸方向の搬送を制限する障壁部と、
前記スクリュ本体の内部に前記障壁部を跨ぐように設けられ、前記スクリュ本体の外周面に開口された入口と出口とを連通する通路と、
を有し、
前記原料を、搬送路に沿って搬送する搬送路搬送工程と、
前記原料が、前記障壁部によって前記搬送部による搬送を制限されることで圧力が高められ、
圧力が高められた前記原料を、前記搬送部に位置する前記入口から、前記通路に流入させ、
前記通路に流入した原料を、前記出口に向かって、前記搬送部による搬送方向と同方向に流通させ、
前記通路を流通した原料を、前記出口より前記スクリュ本体の外周に流出させる通路流通工程と、
を含み、
前記原料が、ポリプロピレンとオレフィンゴムとを含有するポリプロピレン系樹脂組成物である、
混練方法。 - 複数の前記搬送部と前記障壁部とが前記スクリュ本体の軸方向に交互に並べて配置され、前記原料が、前記混練物として吐出するまでに、前記搬送路搬送工程と前記通路流通工程とが複数回繰り返される、
請求項1に記載の混練方法。 - 前記スクリュの周速度が、
0.5m/s以上3.0m/s以下である、
請求項1または請求項2に記載の混練方法。 - 前記通路の内径が、1mm以上8mm以下である、
請求項1〜請求項3の何れか1項に記載の混練方法。 - 前記ポリプロピレン系樹脂組成物は、
ポリプロピレンを25質量%以上90質量%以下、オレフィンゴムを0.1質量%以上40質量%以下、タルクを5質量%以上55質量%以下含む、熱可塑性樹脂である、
請求項1〜請求項4の何れか1項に記載の混練方法。 - ポリプロピレン系樹脂組成物を含む混練物であって、
前記混練物におけるポリプロピレンの分散度が、21%以上である、混練物。 - ポリプロピレン系樹脂組成物を含む混練物であって、
シャルピー衝撃強度が18.5kj/m2以上である、混練物。 - ポリプロピレン系樹脂組成物を含む混練物であって、
ポリプロピレンからなる第1相と、オレフィンゴムを含む第2相と、が相互に連結した相互連結構造を示す、混練物。
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