簡介
回收 丙烯腈丁二烯苯乙烯 (rABS) 是一種由消費後或工業後 ABS 廢料製成的回收工程熱塑性塑膠，通常從電子產品、家電、汽車零件和其他耐用商品中回收。它之所以受到重視，是因為它保留了大部分原生 ABS 的抗衝擊性、剛性、表面品質和加工性，同時減少對化石基原料的依賴，並將塑膠廢料從掩埋或焚燒中轉移。
在實際應用中，rABS 並非單一材料，而是根據來源流、污染程度、顏色一致性、熔體流動性和添加劑配方而有所不同的回收料等級家族。最常見的商業途徑是對分類後的 ABS 豐富廢料進行機械回收，以及最近的循環方案，將回收原料與基於添加劑的修復或單體化學回收相結合，以生產更高純度的回收含量 ABS。其發展處於塑膠循環性、電子廢棄物管理、汽車輕量化與添加製造的交匯點。
rABS 現已被定位為原生 ABS 在許多可見與結構零件中的實用替代品，特別是在需要兼顧韌性、外觀與成本的情況下。同時，其性能比原生 ABS 更具變異性，因為回收料的性質強烈取決於原料純度、先前的熱歷史以及分類與相容化的程度。這使得 rABS 成為一種技術上有用但對品質敏感的材料，持續的創新聚焦於性質穩定化、氣味控制、阻燃安全與閉環回收。
歷史與發展
ABS 之所以成為成熟的工程塑膠，是因為其三元結構結合了剛性、韌性與加工性。隨著 ABS 在消費性電子、汽車內裝、家電、行李箱與玩具中的使用擴展，來自工業後廢料與產品壽終的大量廢物流隨之出現。
早期的 rABS 使用主要是機會性的，依賴清潔製造廢料的 再磨料。隨著時間推移，更先進的分類與清洗/分類系統使得從混合廢棄電機電子設備與報廢車輛中回收 ABS 成為可能，儘管其他聚合物、填料、塗料與 阻燃劑 的污染仍是一大障礙。研究反覆顯示，回收 ABS 可與原生 ABS 或增韌劑混合，以恢復衝擊強度與加工性。
較新的發展已轉向更高價值的循環系統，包括原位相容化、鏈延伸、反應性摻混、回收 ABS 的添加製造再利用，以及回收苯乙烯與丁二烯以生產新 ABS 的化學回收計畫。結果是從「降級回收」回收料逐漸轉向適合嚴苛應用的受控規格級回收 ABS。
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