Highly-efficient flame-retarding unsaturated polyester resin via the designation of an expansive flame retardant

IF 9.9 Q1 MATERIALS SCIENCE, COMPOSITES

Advanced Industrial and Engineering Polymer Research Pub Date : 2025-01-01 DOI:10.1016/j.aiepr.2024.04.001

Ying-Ming Li, Shuang-Lin Hu, Hang-Ping Fang, Yao Deng, Chang-De Yang

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Abstract

Unsaturated polyester resins (UPR) are commonly used in electronics manufacturing and traditional construction, but their inherent flammability greatly limits their use. An expansive flame retardant EZ was prepared via the simple ionic reaction between the 2-Aminothiazole (AMZ) and ethylene diamine tetra methylene phosphoric acid (EDTMP). The thermal decomposition process of EZ and UPR/EZ and the flame retardancy of the compound were studied. The flame retardancy mechanism of EZ in UPR was analyzed in detail. When the EZ content was 15 wt%, the flame-retardant grade of the composite reached V-0. The flame-retardant efficiency was very high mainly through the interaction of gas phase and condensed phase. Interestingly, flame retardant EZ can perform expansion crosslinking in UPR, which can effectively promote carbon formation in UPR. Moreover, EZ itself can also expand to form dense and continuous carbon layers in UPR, which further elucidates the flame-retardant mechanism.

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通过指定膨胀型阻燃剂实现高效阻燃的不饱和聚酯树脂

不饱和聚酯树脂（UPR）在电子制造和传统建筑中应用广泛，但其固有的可燃性极大地限制了其应用。通过2-氨基噻唑（AMZ）与乙二胺四亚甲基磷酸（EDTMP）的简单离子反应，制备了膨胀型阻燃剂EZ。研究了EZ和UPR/EZ的热分解过程及其阻燃性能。详细分析了EZ在UPR中的阻燃机理。当EZ含量为15 wt%时，复合材料的阻燃等级达到V-0级。阻燃效率很高主要是通过气相和冷凝相的相互作用。有趣的是，阻燃剂EZ可以在UPR中进行膨胀交联，可以有效地促进UPR中的成碳。此外，EZ本身也可以在UPR中膨胀形成致密连续的碳层，这进一步阐明了其阻燃机理。

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