State of the art in recycling waste thermoplastics and thermosets and their applications in construction

废弃热塑性和热固性塑料最新回收技术及其在建筑工程中的应用

Polymeric products such as plastics and rubbers are in widespread use, and the recycling of these polymeric materials has not kept pace with the increased production. There are serious environmental consequences to disposing of waste polymeric materials in landfills or incinerating them. Their low biodegradability makes it unpopular for both large and small industries to recycle them. This study reviews recycling strategies for waste thermoplastic and thermoset materials undertaken by industries and researchers. The primary objective is to review these techniques and identify those that can be applicable to the construction industry. There are three conclusions from this review: (1) Recycling of polymeric waste materials can be helpful to limit landfilled or incinerated waste plastic. (2) Proper selection of a recycling method for waste plastics and rubbers can effectively address the recycling problem without compromising the mechanical properties of the construction material. (3) The majority of the published articles in construction materials research have overlooked the importance of pre-treatment of waste polymeric materials to ensure compatibility with construction materials. Accordingly, there is an urgent need for understanding the science of functionalization of polymers to be able to tune surface properties of the recycled granules for targeted applications. This paper highlights critical research needs to facilitate the recycling of thermosets and thermoplastics to promote resource conservation and sustainability.

塑料和橡胶等聚合物产品在日常生活中得到了广泛使用，这些聚合物材料的回收利用并未跟上其产量增加的步伐。在垃圾填埋场掩埋废弃聚合物材料或将其焚化会导致严重的环境后果。它们的低生物降解性使得大型和小型工业企业都不乐于去进行回收。本研究回顾了工业界和科研人员对废弃热塑性和热固性材料的回收策略。主要目的是对这些技术进行评述并确定哪些适用于建筑行业。本综述得到三条结论：（1）废弃聚合物回收利用有助于减少对其的填埋和焚烧。（2）合理选择废弃塑料、橡胶的回收利用方式可以在不损害建筑材料力学性能的前提下有效解决回收问题。（3）大部分已发表的建筑材料领域论文都忽视了对废弃聚合物材料进行预处理以确保其与建筑材料相容性的重要性。因此，迫切需要了解关于聚合物官能化的科学，以便能够针对特定实际应用来调节再生颗粒的表面特性。本文强调了促进热固性和热塑性塑料回收利用以提高资源保护和可持续性的关键研究需求。

Kazemi, M., Kabir, S. F., & Fini, E. H. (2021). State of the art in recycling waste thermoplastics and thermosets and their applications in construction. Resources, Conservation and Recycling, 174, 05776. https://doi.org/10.1016/j.resconrec.2021.105776.