阻燃ABS塑料热处理过程中BTBPE的释放与转化。,Environmental Science & Technology

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阻燃ABS塑料热处理过程中BTBPE的释放与转化。
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-12-18 , DOI: 10.1021/acs.est.8b05483
Faqiang Zhan _{1,

2} , Haijun Zhang ₁ , Rong Cao _{1,

2} , Yun Fan ₁ , Pengjun Xu ₃ , Jiping Chen ₁

Affiliation

在装有溴化阻燃剂（BFR）的工程塑料的生命周期中，不可避免地会发生热场景。但是，关于热加工过程中嵌入式BFR的命运的信息很少。在这项研究中，我们测量了在丙烯腈丁二烯苯乙烯（ABS）塑料热处理过程中典型的BFR，1,2-双（2,4,6-三溴苯氧基）乙烷（BTBPE）的释放和转化。通过改变加热温度和气氛来模拟可能的热情景。在350℃下观察到BTBPE的最大释放速率。建立了释放动力学模型，以探索加热ABS时BTBPE释放的机理。发现材料-相扩散是释放过程中的决定速率的步骤。根据开发的发布模型，估计为0.04-0。在ABS塑料的工业加工过程中，有17％的嵌入式BTBPE可以释放到空气中。当加热温度≥350°C时，大约15-56％的嵌入式BTBPE分解为溴酚（BPs）和1,3,5-三溴-2-（乙烯基氧基）苯（TBVOB），然后分解首先进行-在350°C下有序动力学。多溴二苯并对二恶英和二苯并呋喃（PBDD / Fs）也在≥350°C时由BPs和TBVOB通过前体机制明显形成。较高的温度（≥450°C）有利于PBDF的形成。

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Release and Transformation of BTBPE During the Thermal Treatment of Flame Retardant ABS Plastics

Thermal scenarios inevitably occur during the lifecycle of engineering plastics laden with brominated flame retardants (BFRs). However, little information on the fate of embedded BFRs during the thermal processes is available. In this study, we measured the release and transformation of a typical BFR, 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE), during the thermal treatment of acrylonitrile butadiene styrene (ABS) plastics. The possible thermal scenarios were simulated by varying the heating temperature and atmosphere. The maximum release rate of BTBPE was observed at 350 °C. A release kinetic model was developed to explore the mechanism of BTBPE release while heating ABS. Material–phase diffusion was found to be the rate-determining step during release. According to the developed release model, it was estimated that 0.04–0.17% of embedded BTBPE could be released to air during the industrial processing of ABS plastics. When the heating temperature was ≥350 °C, approximately 15–56% of embedded BTBPE decomposed to bromophenols (BPs) and 1,3,5-tribromo-2-(vinyloxy) benzene (TBVOB), and the decomposition followed a first-order kinetics at 350 °C. Polybrominated dibenzo-p-dioxins and dibenzofurans (PBDD/Fs) were also significantly formed at ≥350 °C from BPs and TBVOB via a precursor mechanism. A higher temperature (≥450 °C) was favorable for the formation of PBDFs.

更新日期：2018-12-19

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