JP7453478B2 - 典型的なグリーン及び低炭素特性を有する廃ポリエステルの閉ループ回収による再生ポリエステルの調製方法 - Google Patents
典型的なグリーン及び低炭素特性を有する廃ポリエステルの閉ループ回収による再生ポリエステルの調製方法 Download PDFInfo
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- JP7453478B2 JP7453478B2 JP2023527370A JP2023527370A JP7453478B2 JP 7453478 B2 JP7453478 B2 JP 7453478B2 JP 2023527370 A JP2023527370 A JP 2023527370A JP 2023527370 A JP2023527370 A JP 2023527370A JP 7453478 B2 JP7453478 B2 JP 7453478B2
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Description
前記廃ポリエステルに対して、不純物の除去、洗浄、破砕を行った後、直接解重合することができる。
(実施例1~5)
(比較例1~3)
(比較例7)
Claims (6)
- 典型的なグリーン及び低炭素特性を有する廃ポリエステルの閉ループ回収による再生ポリエステルの調製方法であって、
廃ポリエステルを解重合するステップS1であって、
解重合触媒とマイクロ波吸収剤を含有するポリオール溶媒に廃ポリエステルを溶解し、常圧、不活性ガス雰囲気、マイクロ波条件下で解重合反応し、解重合生成物を得て、
前記解重合触媒は、チタン酸ナノチューブ、リン酸チタン、二酸化チタン、オルトチタン酸テトラブチル、グリコール酸チタン又はブタン二酸化チタンのうちの1種以上であり、
前記解重合反応の温度は、150~170°Cであり、温度変動は<2°Cであり、解重合反応の時間は6~35分であり、
前記解重合触媒は、廃ポリエステルの0.05~0.15重量%を占め、
前記廃ポリエステルとポリオールとの質量比は、1:(0.6~3)であり、
前記マイクロ波吸収剤は、炭酸ナトリウム、塩化ナトリウム、活性炭又はリン酸ナトリウムのうちの1種以上であり、
前記廃ポリエステルは、ポリブチレンアジペート/ブチレンテレフタレート、ポリ(ブチレンセバケート-ブチレンテレフタレート)コポリエステル、ポリエチレンテレフタレート-1,4-シクロヘキサンジメタノール、ポリエチレンテレフタレート-1,4-シクロヘキサンジメタノール、ポリブチレンテレフタレート又はポリエチレンテレフタレートのうちの1種以上の組み合わせであるステップS1と、
解重合生成物を精製するステップS2であって、
ステップS1で得られた解重合生成物からポリオール溶媒を除去した後、精製して副生成物を除去し、解重合モノマーを得るステップS2と、
直接エステル化するステップS3であって、
ステップS2で得られた解重合モノマーを二塩基酸、ポリオール、重合触媒、及び鎖延長剤と混合し、不活性ガス雰囲気、マイクロ波条件下で反応し、エステル化生成物を得るステップS3と、
縮合重合するステップS4であって、
ステップS3で得られたエステル化生成物を触媒及び安定剤と混合し、真空排気条件下で縮合重合反応し、前記再生ポリエステルを得るステップS4とを含むことを特徴とする、方法。 - ステップS1における前記解重合反応の温度は、155~165℃であり、その時間は、10~30分であることを特徴とする、請求項1に記載の方法。
- ステップS1における前記マイクロ波条件は、500~1000wのマイクロ波出力、122mmのマイクロ波波長であることを特徴とする、請求項1に記載の方法。
- 前記重合触媒は、オルトチタン酸テトラブチル、オルトチタン酸テトライソプロピル、チタンリン化合物、チタンケイ素化合物又はオルトチタン酸テトラエチルのうちの1種以上であることを特徴とする、請求項1に記載の方法。
- ステップS4における前記安定剤は、有機亜リン酸エステル系安定剤、リン酸トリメチル系安定剤、ヒンダードフェノール系安定剤のうちの1種以上であることを特徴とする、請求項1に記載の方法。
- ステップS3における前記マイクロ波条件は、500~1000wであり、前記重合反応の温度は、160~180℃であり、その時間は、30~90分であることを特徴とする、請求項1に記載の方法。
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