聚碳酸酯饮水桶中掺杂再生料的判定方法研究

Study on the identification of adulteration of polycarbonate drinking bottles with postconsumer recycled plastics

中文关键词:  聚碳酸酯饮水桶  再生料  判定

英文关键词:polycarbonate drinking bottles  recycled plastics  identification

中文摘要:

      目的 建立聚碳酸酯饮水桶中掺杂再生料的判定方法。方法 将聚碳酸酯(polycarbonate, PC)新料双螺杆反复熔融挤出成型, 模拟食品接触用PC的循环再生过程, 通过对PC新料和模拟再生料的对比分析, 确定区分PC新料和PC再生料的关键成分酚类物质, 并采用紫外可见光谱法和气相色谱-质谱法快速检测酚类物质。最后在PC新料中掺杂不同含量的PC再生料, 验证建立方法的可靠性。结果 波长288 nm处紫外吸光值大于0.75, 且气相色谱-质谱法检测出单酚A、双酚A等酚类物质且小分子物质种类较多, 强度较大的样品, 视为掺杂再生料的样品。该分析检测系统可以对掺杂再生料比例低至20%的样品进行判定。结论 本文建立的紫外光谱筛查结合气相色谱-质谱联用确证的方法能够实现聚碳酸酯再生料的快速、准确的测定。

英文摘要:

      Objective To establish a determination method for polycarbonate drinking water bucket adulterated with recycled material. Methods The polycarbonate (PC) new material twin screw is repeatedly melted and extruded to simulate the recycling process of PC for food contact. Through the comparative analysis of the new PC material and the simulated recycled material, the phenolic substance which were the key components of the PC new material and the PC recycled material were determined, and the phenolic substance were quickly detected by ultraviolet-visible spectroscopy and gas chromatography-mass spectrometry. Finally, the new PC material was mixed with PC recycled materials with different contents to verify the reliability of the established method. Results The ultraviolet absorption value at 288 nm was greater than 0.75, and the phenolic substances such as monophenol A and bisphenol A were detected by gas chromatography-mass spectrometry, and the samples with more kinds of small molecular substances and higher strength were regarded as the samples doped with recycled materials. The analysis and detection system could judge samples with a proportion of as low as 20% of doped recycled materials. Conclusion The UV spectrum screening combined with gas chromatography-mass spectrometry confirmed method established in this paper can realize the rapid and accurate determination of polycarbonate recycled materials.