China Plastics ›› 2025, Vol. 39 ›› Issue (8): 83-87.DOI: 10.19491/j.issn.1001-9278.2025.08.013

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Thiazole⁃based organophosphorus flame retardant: synthesis and application in epoxy resin

LUAN Jinming(), WEI Zihao, LIU Tianxi, YAN Shijing, XU Weihua()   

  1. Guangxi Colleges and Universities Key Laboratory of Environmental?friendly Materials and New Technology for Carbon Neutralization,Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization,School of Materials and Environment,Guangxi Minzu University,Nanning 530105,China
  • Received:2024-06-21 Online:2025-08-26 Published:2025-07-30

Abstract:

A novel thiazole⁃based organophosphorus flame retardant (D⁃P⁃A) was successfully synthesized via a one⁃pot method and its structure was characterized using FTIR and NMR spectroscopy. The effect of the resulting compound on flame retardancy and thermal stability were systematically evaluated in a bisphenol⁃A epoxy resin/4,4′⁃diaminodiphenylmethane curing system. Structural analysis confirmed the successful preparation of the target D⁃P⁃A compound, which exhibited remarkable char⁃forming catalytic activity. At a phosphorus loading of merely 0.8 wt%, the modified epoxy resin achieved a UL94 V⁃0 rating in vertical burning tests. Cone calorimetry demonstrated a significant improvement in fire performance, with peak heat release rate (pHRR), average heat release rate (av⁃HRR), and total heat release (THR) reduced by 51.2% (423.8 kW/m²), 25.5% (189.7 kW/m²), and 25.6% (114.1 MJ/m²), respectively, compared to the pristine resin. Furthermore, thermogravimetric analysis revealed enhanced char residue at 800 ℃, increasing from 17.5 wt% to 21.2 wt%. These results collectively demonstrated the exceptional flame⁃retardant efficiency of D⁃P⁃A in epoxy resins, making it a promising candidate for high⁃performance fire⁃safe polymer applications.

Key words: epoxy resin, halogen?free flame retardant, synergistic flame retardant, intrinsic flame retardant

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