High performance flame protection epoxy coatings enabled by dual-modified TA-Fe complexes and ZnSn(OH)6@P-N microspheres

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-11 DOI:10.1016/j.colsurfa.2025.138670

Fei Zhong , Xubin Yang , Chunlin Chen , Yingqing Zhan , Xinyu Bai , Wenjin He , Liyun Zhang

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Abstract

Here, a high P, N-containing microsphere (PZM) was synthesized from hydroxyl/amino-rich dopamine and hexachlorocyclotriphosphonitrile (HCCP). As an organic additive, PZM provided inherent flame-retardant activity and good dispersion in the epoxy matrix. Zinc hydroxystannate nanoparticles (ZHS) and a tannic acid–iron complex (TA-Fe) were then assembled on the PZM surface in a gradient manner to form a multilayered nano flame retardant (PZM/ZHS@TA-Fe). This hybrid not only preserved the flame-retardant role of PZM but also imparted stronger metal-catalyzed carbonization capability, enhancing thermal barrier performance and char densification. The PZM/ZHS@TA-Fe/EP coating showed a minimum backside temperature of 170.6 ± 2.1 ℃ in large-plate tests, 36.79 % lower than pure EP, and formed a denser, more intact char. Furnace chamber tests revealed an expansion height of 23.8 ± 0.93 mm (expansion rate 18.45 ± 0.73), confirming excellent thermal insulation. Moreover, its smoke density rating (40.5 ± 1.62 %) was 38.73 % lower than that of pure EP, indicating remarkable smoke suppression. These results demonstrated that the proposed nano flame retardant effectively reinforced char formation capability and fire protection of waterborne epoxy intumescent coatings.

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由双改性TA-Fe配合物和ZnSn(OH)6@P-N微球制成的高性能防火环氧涂料

以富含羟基/氨基的多巴胺和六氯环三磷酸腈为原料合成了高含磷微球（PZM）。作为一种有机添加剂，PZM具有固有的阻燃活性和良好的分散性能。然后将羟基锡酸锌纳米颗粒（ZHS）和单宁酸-铁配合物（TA-Fe）以梯度方式组装在PZM表面，形成多层纳米阻燃剂（PZM/ZHS@TA-Fe）。该杂化物不仅保留了PZM的阻燃作用，而且赋予了PZM更强的金属催化碳化能力，提高了热障性能和焦化性能。在大板试验中，PZM/ZHS@TA-Fe/EP涂层的最低背面温度为170.6 ± 2.1℃，比纯EP降低36.79 %，且形成的焦炭更致密、更完整。炉膛试验表明，膨胀高度为23.8 ± 0.93 mm（膨胀率为18.45 ± 0.73），保温性能优良。烟气密度等级（40.5 ± 1.62 %）比纯EP低38.73 %，抑烟效果显著。结果表明，所制备的纳米阻燃剂能有效增强水性环氧膨胀涂料的成焦性能和防火性能。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.