Synthesis of aluminum bis(hydroxy-phenyl-methyl)phosphinate and its synergistic flame retardant mechanism in PLA

IF 3.8 4区工程技术 Q2 CHEMISTRY, APPLIED

Journal of Vinyl & Additive Technology Pub Date : 2023-09-13 DOI:10.1002/vnl.22051

Baoming Xu, Jingxue Yang, Xinhui Wang, Na Wang, Guorong Chen, Heng Zhang

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Abstract

In this paper, we report on the synthesis of a new aluminum bis(hydroxy-phenyl-methyl)phosphinate, AlBPi, under mild reaction conditions. The product structure was confirmed via characterization, and its thermal stability and flame retardant properties were assessed. To improve the flame retardant properties, we employed ammonium polyphosphate (APP) as a synergist with AlBPi. The PLA composite material containing 10% AlBPi and 5% APP achieved an LOI of 28.1% and a UL-94 rating of V-1. Cone calorimetry tests showed a significant reduction in PHRR, THR, PSPR, and TSP for the PLA/AlBPi/APP composite compared to the pure and PLA/AlBPi materials. SEM analysis revealed a continuous and dense char layer on the residual surface of the synergistic flame retardant sample. AlBPi and APP exhibited excellent synergistic flame retardant effects, with both releasing a large amount of PO·free radicals. APP was also able to release inert gas, exhibiting excellent flame retardant effects in the gas phase. Additionally, APP improved the charring performance of AlBPi and formed a compact char layer on the material surface, achieving good flame retardant effects in the condensed phase. Therefore, the AlBPi and APP synergistic flame retardant system can be considered a viable flame retardant additive for PLA.

Highlights

A novel flame retardant AlBPi was synthesized.
AlBPi and APP demonstrate good synergistic flame retardant performance in PLA.
AlBPi and APP play a flame retardant role in both gas and condensed phases.

Abstract Image

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双（羟基苯基甲基）膦酸铝的合成及其在聚乳酸中的协同阻燃机制

本文报告了在温和的反应条件下合成新型双（羟基-苯基-甲基）膦酸铝 AlBPi 的情况。通过表征确认了产品结构，并评估了其热稳定性和阻燃性能。为了提高阻燃性能，我们采用了聚磷酸铵（APP）作为 AlBPi 的增效剂。含有 10% AlBPi 和 5% APP 的聚乳酸复合材料的 LOI 为 28.1%，UL-94 等级为 V-1。锥形量热仪测试表明，与纯材料和 PLA/AlBPi 材料相比，PLA/AlBPi/APP 复合材料的 PHRR、THR、PSPR 和 TSP 显著降低。扫描电子显微镜分析表明，在协同阻燃样品的残余表面上有一层连续而致密的炭层。AlBPi 和 APP 表现出卓越的协同阻燃效果，两者都释放出大量不含 PO 的自由基。APP 还能释放惰性气体，在气相中表现出优异的阻燃效果。此外，APP 还能改善 AlBPi 的炭化性能，并在材料表面形成致密的炭层，在凝聚相中实现良好的阻燃效果。因此，AlBPi 和 APP 协同阻燃体系可被视为聚乳酸的一种可行的阻燃添加剂。亮点合成了一种新型阻燃剂 AlBPi。 AlBPi 和 APP 在聚乳酸中表现出良好的协同阻燃性能。 AlBPi 和 APP 在气相和凝结相中都发挥了阻燃作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Vinyl & Additive Technology 工程技术-材料科学：纺织

CiteScore

5.40

自引率

14.80%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.