Organophosphonic acid intercalation and surface-functionalized hydrotalcite-based flame retardant materials for epoxy resins with highly effective smoke suppression and fire safety

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-05-17 DOI:10.1016/j.csite.2025.106361

Yuting Ao , Lulu Xu , Hanjun Wu , Qingrong Cheng , Hong Zhou , Zhiquan Pan

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引用次数: 0

Abstract

In this work, the green and efficient organic-inorganic hybrid flame retardant materials (PA-Si-PPO-LDHs) were prepared by introducing phenyl phosphoric acid (PPO) and phytic acid (PA) between layers and surface of hydrotalcites, and characterized. With the addition of 10 wt% PA-Si-PPO-LDHs, the EP composites achieved UL-94 V-1 rating and a limiting oxygen index of 30.0 %, and obtained 46.4 %, 37.0 % and 20.1 % reduction in heat release rate, CO production and total smoke production, respectively. In addition, the PA-Si-PPO-LDHs were better dispersed in EP, and the tensile, three-point bending and simple beam impact strengths of EP composites were improved in comparison with the pure EP. The prepared PA-Si-PPO-LDHs contributed to improve the flame retardant of EP composites by the formation of the dense char layer in the condensed phase, dilution of flammable gases and the released phosphorus-containing free radicals for capture of the H• and HO• free radicals in the gas phase. Co and Ni metal-catalyzed CO conversion of CO₂ reduced the release of heat and hazardous gases, and improve the fire safety of EP composites. The present work provided a simple method for the preparation of green and efficient LDHs-based organic-inorganic hybrid flame retardants for improving the fire safety of epoxy composites.

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有机膦酸插层和表面功能化水滑石基环氧树脂阻燃材料，具有高效抑烟和防火性能

本文通过在水滑石层与表面之间引入苯基磷酸（PPO）和植酸（PA）制备了绿色高效的有机无机杂化阻燃材料PA- si -PPO- ldhs，并对其进行了表征。添加10 wt%的PA-Si-PPO-LDHs后，EP复合材料达到UL-94 V-1等级，极限氧指数为30.0%，放热率、CO产量和总烟产量分别降低46.4%、37.0%和20.1%。此外，PA-Si-PPO-LDHs在EP中的分散性更好，EP复合材料的拉伸强度、三点弯曲强度和单梁冲击强度均比纯EP提高。制备的PA-Si-PPO-LDHs通过在凝聚相中形成致密炭层，稀释可燃气体，释放含磷自由基捕获气相中的H•和HO•自由基，有助于提高EP复合材料的阻燃性。Co和Ni金属催化Co转化CO2减少了热量和有害气体的释放，提高了EP复合材料的防火安全性。本研究为制备绿色高效的ldhs基有机无机杂化阻燃剂提供了一种简便的方法，可提高环氧复合材料的防火安全性。

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

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.