簡介
回收料 是透過回收塑膠廢棄物獲得的二次原料，經處理後作為可加工的塑膠原料返回製造業。在塑膠產業中，此詞彙通常指已分類、清洗、再加工並轉化為適用於新產品的薄片、再粒化物或複合物的回收聚合物，例如 PE、PP、PET 及 PVC 組分。
回收料在循環經濟中佔有核心地位，因為它們將壽終正寢的塑膠連結回生產過程，減少對原生聚合物的需求、降低廢棄物量，並提升供應韌性。然而，其技術價值強烈取決於原料品質、污染程度、聚合物身分、熱歷史及預期最終用途。
本文聚焦於回收料作為材料類別而非單一聚合物家族，涵蓋其定義、製造方式、應用領域，以及為何在包裝、建築、汽車、農業、消費品及工業應用中日益重要。
定義與範圍
回收料一般是指經回收過程從廢棄物中回收並再次適合製造的塑膠材料。在法律與技術用語中，此詞彙比單純的「回收塑膠」更廣，因為它強調回收或再生過程的輸出已成為可用的原料。
常見產業區分包括：
- PCR：消費後回收料，源自最終使用者廢棄物流，例如使用過的瓶子或包裝。
- PIR：工業後回收料，源自生產廢料、邊角料、開機廢料或不合格品。
- 再研磨料：經機械尺寸縮減的材料，通常直接來自生產廢料。
- 再粒化物：經清洗與熔融再加工的回收料，以粒料形式存在。
- 複合物：回收料與原生聚合物及 additives 混合，以符合特定規格。
歷史與發展
回收料的工業應用伴隨機械回收的擴展而發展，特別是可再次熔融與重塑的 thermoplastics。早期回收料市場以低規格應用為主，因為污染、氣味、顏色變化及性質漂移限制了性能一致性。
隨時間推移，改良的分選、熱洗與冷洗、熔體過濾、除臭、穩定化、相容化及複合化，擴大了可用回收料等級的範圍。最近，化學回收已發展成為針對難處理廢物流及純度要求較高應用的補充途徑。
化學結構與關鍵性質
回收料並非獨立的聚合物化學；從化學角度而言，它們與原生塑膠中的聚合物家族相同，但具有不同的加工歷史、添加劑遺留及雜質分佈。其性質取決於基礎樹脂、來源流及回收途徑。
典型性質驅動因素包括：
- 分子量降低：來自熱及氧化降解，可能降低衝擊強度、伸長率及熔體強度。
- 添加劑耗竭或失衡：特別是 stabilizers、lubricants、antistatic agents 及 pigments。
- 污染：來自標籤、紙張、金屬、油墨、食物殘渣、多層材料或不相容聚合物。
- 氣味與顏色變異性：特別在 PCR 流中。
- 性質散佈：由混合原料及不均勻先前使用歷史所致。
一個有用的技術觀點是，回收料是「規格材料」，而非僅僅是廢棄物衍生材料：商業價值在於符合一套定義的加工及性能限制。
實際限制與因應措施
| 限制 | 原因 | 因應措施 |
|---|---|---|
| 性質漂移 | 熱歷史、鏈斷裂、氧化及原料變異性 | 與原生樹脂混合、使用穩定劑套件、縮小原料選擇範圍，並實施更嚴格的進料品管 |
| 顏色不一致 | 混合來源流、pigments 及污染 | 依顏色分選、可行時脫色，或用於深色/不透明產品 |
| 氣味 | 殘留揮發物、吸收的有機物、降解產物 | 強化清洗、除臭擠出、真空排氣，並應用於對氣味不敏感的產品 |
| 污染敏感度 | 異物聚合物、標籤、金屬、水分、食物殘渣 | 先進分選、熔體過濾、compatibilizers，以及上游設計以利回收 |
| 食品接觸限制 | 安全與可追溯性要求 | 使用經核准的回收製程、嚴格法規管制，或在接受的化學回收途徑 |
| 許多聚烯烴回收料的阻隔性能不佳 | 固有聚合物滲透性及降解結構 | 多層設計、coatings、EVOH 或其他阻隔層，或用於非阻隔產品 |
| 聚烯烴回收料的表面能低 | PE/PP 化學性質抗拒潤濕與黏附 | 電暈、電漿、火焰處理、底漆或表面接枝黏合層 |
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