環境資源報告成果查詢系統

環保型A-PET收縮膜材料配方與設備製程加工技術開發

中文摘要 聚酯（PET）薄膜是一種結晶型材料，普通聚酯薄膜經過特殊加工處理只能得到 30%以下的熱收縮率。若要獲得熱收縮率較高的聚酯薄膜，則必須對其進行改性。以二元羧酸(Acidic)進行共聚改性時，所製得的 PET共聚物，則稱之為A-PET。 因加入的第三單體中，可改變聚酯對稱的緊密架構，破壞大分子鏈的整齊性，進而降低大分子間的作用力，使聚酯分子架構變得比較柔順，而難以成核結晶，所以可用來製造高收縮率的薄膜。 A-PET收縮膜其生產流程是先將A-PET共聚樹脂進行除濕乾燥處理，然後利用押出機擠出成型、冷卻，再將膜片加熱到玻璃化溫度以上的某一適當溫度範圍內，並在外力的作用下，進行單方向或雙向一定倍數的拉伸，透過拉伸使A-PET大分子鏈沿外力方向取向，接著使之冷卻定型，使已取向的 A-PET 分子架構“凍結＂定型。這種外力作用下的高彈性則變得具有熱收縮的“記憶效應＂，當把這種具有“記憶效應＂的薄膜再加熱到拉伸溫度以上時，被凍結了的大分子取向架構開始鬆馳，在我們觀察上則為 A-PET薄膜發生收縮。這種 A-PET薄膜熱收縮主要是由取向的無定形部分所貢獻，這就是為什麼要共聚改性成非結晶性 A-PET的原因。 目前達成指標包括: 1. 確定 A-PET為非結晶態，共聚改質後的 A-PET沒有出現結晶峰。 2. 試作之薄膜試片，裁成ASTM D-882 薄膜試片，拉伸強度測試結果均達達到 MD：7000psi 以上， TD：20000psi 以上。拉伸率：MD：20%以上， TD：30%以上。 3. 試作之薄膜試片，裁成ASTM D-882 薄膜試片，撕裂強度測試結果均達到 MD：0.2kgf，TD：0.3kgf。霧度及光澤度裁成 ASTM D-1003 薄膜試片測試結果均達到 Haze：10%以下。Gloss：100%以上。 目前市售的瓶類標籤、電池或電容器、3C產品等包裝，都是使用難以回收處理的 PVC 收縮膜，而本計畫經改質後成為非結晶性之 A-PET收縮膜，可替代高價之進口原料 PETG收縮膜，不但能符合市場上對收縮膜的要求，且更具成本優勢；此創新技術亦將使 PVC套標業者及印刷業者、包裝加工業者，可以在最不影響現有原生產設備狀況下進行 PVC收縮膜的替換，為環保收縮膜之加工和製造，達到低成本、高可行性的技術升級效益，為地球的環保貢獻一份心力。
中文關鍵字 共聚酯, A-PET收縮膜, 熱收縮膜

基本資訊

專案計畫編號 EPA-96-U1U1-04-004 經費年度 096 計畫經費 1750 千元
專案開始日期 2007/11/19 專案結束日期 2008/09/18 專案主持人 陳嘉勳
主辦單位 永續發展室(停用) 承辦人 林燕柔 執行單位 遠東科技大學精密機械創新育成中心

成果下載

類型 檔名 檔案大小 說明
期末報告 期末報告.pdf 7MB [期末報告]公開完整版

The Development of Environmental Friendly A-PET Shrinkage Film Materials : The preparation methods , processing equipments and relative technologies

英文摘要 Poly(ethylene terephthalate) (PET) is a kind of crystalline polymer. In traditional, PET film can get only 30% shrinkage ratio via a special processing. A modification of PET film can reach higher shrinkage. Amorphous poly(ethylene terephthalate) (A-PET) is a copolymer, which was synthesized by adding a diacidic component(the third component) in copolymerization reaction. The third component can change the regular structure of polymer, reduce the inter- and intra- molecular interaction, that can destroy the crystalline of poly(ethylene terephthalate). The film with high shrinkage ratio can be fabricated by using this material. A-PET shrinkage film is prepared by the following steps: A-PET was dried then compounded by an extruder, then molded via a casting die. The film was mono– or bi- axially stretched at a proper temperature (above glass transition temperature), then cooled to freeze the molecular structure , then “memorized”. When the film was heated to the stretching temperature, the memorized macromolecule was relaxation then the film shrink. The amorphous region of PET contribute the shrinkage ratio a lot , that is why we need A–PET to manufacturing the heat shrinkage film. Targets of A-PET shrinkage film: 1. A-PET is amorphous polymer since the modified A-PET copolymer has no crystalline pick in DSC analysis.The technology of synergistic effect of fire retardants. 2. The tensile strength of A-PET film is above MD：7000psi, TD：20000psi ; and the tensile elongation is above MD：20%, TD：30% , according to ASTM D-882 method. 3. The tear strength of A-PET film is MD：0.2kgf，TD：0.3kgf according to ASTM D-882 method. According to ASTM D-1003 method, the haze and gloss of A-PET film are below 10% and above 100%, respectively. PVC shrink film is a major material in present packing market, especially in the bottle labels, batteries, capacitors, and 3C products. PVC shrink film is very difficult to recycle. In this plan, we try to use the amorphous A-PET shrink film to replace the high cost PETG shrink film. This can not only fit the market requirements, also has the low cost advantage. This innovation technology also let the PVC entrepreneur , printing entrepreneur and the packing processing entrepreneur achieved a low cost, high feasible technical promotion benefit, without replacing the existing original production equipments , in processing and the manufacturing the environmental friendly shrink films. This project contributes a lot of efforts for the environmental protection.
英文關鍵字 copolyester, amorphous poly (ethylene terephthalate) shrinkage film, heat shrinkage film