Research on the flame retardancy properties and mechanism of modified epoxy resin with graphene-based hybrid

IF 3.8 4区工程技术 Q2 CHEMISTRY, APPLIED

Journal of Vinyl & Additive Technology Pub Date : 2025-01-28 DOI:10.1002/vnl.22204

Yunrui Luo, Ling Ming, Xiu Wang, Zihao Zhan, Chengyi Xu

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引用次数: 0

Abstract

The inherent disadvantage of epoxy resin (EP) is that it is easy to burn, and a large number of toxic and harmful gases are generated in the combustion process, and there is a huge fire hazard. Graphene, a two-dimensional-layered material with physical barrier effects, is used by many researchers to enhance the fire safety of EP, but because of its easy aggregation, it is difficult to prepare high-performance flame retardants. In our work, a high-performance graphene flame retardant was prepared by grafting a hollow zirconium organic frame material onto the surface of graphene. First, zirconium-based organic frame material (UiO66-NH₂) with different particle sizes was prepared by adjusting acetic acid, the hollow organic frame material was etched with sodium tungstate under acidic conditions, and then reacted with organophosphorus and graphene oxide, thus W-UiO66-DOPO-RGO were obtained. The results show that the W-UiO66-3-DOPO-RGO/EP has enhanced smoke suppression and flame retardancy, the LOI value up to 33.5%, vertical combustion class up to UL-94V-0, PHRR and TSP reduced by up to 58% and 42%, respectively. Through the characterization of the condensed and gas phase of EP composites, the relevant flame retardancy mechanism was clarified, which were mainly the synergistic flame retardancy and smoke suppression mechanism among the adsorption of fractional pores of hollow bimetallic MOFs, catalytic carbonization of metals, condensed phase and gas phase interaction of phosphorus elements, and physical shielding of RGO.

Highlights

A high-performance graphene-based flame retardants were proposed.
3 wt% of W-UiO66-3-DOPO-RGO endows EP with excellent flame retardancy.
The fire safety mechanism of W-UiO66-DOPO-RGO/EP was proposed.

Abstract Image

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石墨烯基杂化改性环氧树脂的阻燃性能及阻燃机理研究

环氧树脂（EP）固有的缺点是易燃烧，燃烧过程中会产生大量有毒有害气体，存在巨大的火灾隐患。石墨烯是一种具有物理阻隔效应的二维层状材料，被许多研究者用于增强EP的防火安全性，但由于其易聚集，难以制备高性能阻燃剂。在我们的工作中，通过在石墨烯表面接枝中空锆有机框架材料制备了高性能石墨烯阻燃剂。首先，通过调节乙酸制备不同粒径的锆基有机框架材料（UiO66-NH2），在酸性条件下用钨酸钠蚀刻空心有机框架材料，然后与有机磷和氧化石墨烯反应，得到W-UiO66-DOPO-RGO。结果表明：W-UiO66-3-DOPO-RGO/EP具有较强的抑烟性和阻燃性，LOI值达到33.5%，垂直燃烧等级达到UL-94V-0， PHRR和TSP分别降低58%和42%。通过对EP复合材料的缩合和气相的表征，阐明了相关的阻燃机理，主要是空心双金属mof的分数孔吸附、金属的催化碳化、磷元素的缩合和气相相互作用以及RGO的物理屏蔽之间的协同阻燃和抑烟机理。提出了一种高性能石墨烯基阻燃剂。3wt %的W-UiO66-3-DOPO-RGO使EP具有优异的阻燃性能。提出了W-UiO66-DOPO-RGO/EP的消防安全机理。

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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.