样品预处理对机械塑料回收的分析代表性的影响:关于制阻燃剂的案例研究
Krista Grönlund1, Ville H Nissinen1, Joonas Mikkonen2
1Department of Chemistry and Sustainable Technology, University of Eastern Finland, Yliopistokatu 7, 80130 Joensuu, Finland.
Waste management (New York, N.Y.)
|August 19, 2025
概括
标准化预处理对于回收塑料的准确分析至关重要. 低温研磨或化同质化确保在回收聚合物中具有代表性的制阻燃剂 (BFR) 确定.
科学领域:
- 聚合物化学 聚合物化学
- 分析化学 分析化学
- 材料科学 材料科学 材料科学
背景情况:
- 欧盟的法规限制了回收塑料中的特定制阻燃剂 (BFR).
- 机械回收过程可以产生异质的塑料流,使监管合规性分析复杂化.
- 目前缺乏用于回收塑料中的BFR的标准化分析方法.
研究的目的:
- 评估不同样品预处理方法对回收塑料中BFR分析代表性的影响.
- 为了比较直接注射成型,化同质化,冷研磨和样品制备的联合方法.
- 通过使用各种预处理技术,评估高冲击聚钢 (HIPS) 中BFR的分布和含量.
主要方法:
- 使用蓝色和白色HIPS片的模型料进行预处理评估.
- 我们比较了四种预处理策略:直接注射成型,化同质化,冷研磨和结合冷研磨/化同质化.
- 使用视觉检查和直接插入探头质谱法 (DIP-MS) 评估样本的一致性.
- 使用X射线光 (XRF) 和DIP-MS分别量化总和TBBPA的分布.
主要成果:
- 薄片混合物的直接注射成型导致样本分布异质.
- 在成型之前的冷研磨和化同质化产生了同质的样品.
- 与直接成型的样本相比,融均样本通过XRF显示出更低和更一致的含量.
- DIP-MS在添加剂识别和空间分布分析方面都被证明是有效的.
结论:
- 样品预处理对回收塑料分析结果的代表性产生重大影响.
- 低温研磨和化同质化是获得同质样品的有效方法.
- 标准化样品预处理协议对于可靠的回收塑料批量分析和合规性至关重要.
- 提高分析准确度将提高塑料回收计划的有效性.
相关概念视频
Classification and Mechanical Properties of Synthetic Polymers
Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...
Bioplastics
Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
Microbial Bioremediation of Plastics
Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...


