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粉煤灰-壳聚糖复合物增强水性膨胀型防火涂料耐火性能

孙朝 金义杰 严晗 段海涛 詹胜鹏 余华龙 陈奡 贾丹

孙朝, 金义杰, 严晗, 等. 粉煤灰-壳聚糖复合物增强水性膨胀型防火涂料耐火性能[J]. 复合材料学报, 2024, 42(0): 1-10.
引用本文: 孙朝, 金义杰, 严晗, 等. 粉煤灰-壳聚糖复合物增强水性膨胀型防火涂料耐火性能[J]. 复合材料学报, 2024, 42(0): 1-10.
SUN Zhao, JIN Yiji, YAN Han, et al. Fire resistance of waterborne intumescent fire-retardant coatings reinforced by fly ash-chitosan composites[J]. Acta Materiae Compositae Sinica.
Citation: SUN Zhao, JIN Yiji, YAN Han, et al. Fire resistance of waterborne intumescent fire-retardant coatings reinforced by fly ash-chitosan composites[J]. Acta Materiae Compositae Sinica.

粉煤灰-壳聚糖复合物增强水性膨胀型防火涂料耐火性能

基金项目: 国家自然科学基金(52205213);湖北省重大攻关项目(JD) (2023BAA003)。
详细信息
    通讯作者:

    贾丹,博士,正高级工程师,表面工程防护技术及寿命预测,jiadan0510@163.com

  • 中图分类号: TQ328.3; TB332

Fire resistance of waterborne intumescent fire-retardant coatings reinforced by fly ash-chitosan composites

Funds: This work was financially supported by the National Natural Science Foundation of China (52205213), Major Program(JD) of Hubei Province (2023BAA003)
  • 摘要: 以粉煤灰(FA)和壳聚糖(CS)等废弃物为原料,制备了FA-CS复合阻燃填料,并将其引入水性膨胀型防火涂料体系中,以强化涂层的耐火极限和隔热性能,采用FT-IR、XRD、SEM等技术对复合阻燃填料进行观察分析。再通过大板实验、背温曲线和微观组织结构等考察了涂层的耐火性能和隔热能力,从而揭示其防火阻燃机制。大板实验显示在外焰温度维持在1000±50 ℃,燃烧时间为60 min的前提下,相比水性膨胀体系(WIS)、FA/WIS、CS/WIS涂层,FA-CS/WIS涂层具有较高的膨胀倍率(10.2倍)和更低的背面温度(279 ℃),表现出优异的阻隔热量传递和抗火焰冲刷的能力。此外,采用SEM技术对涂层膨胀层表面形貌进行分析,结果显示相比其他涂层,FA-CS/WIS涂层具有更致密光滑的表面。FA-CS/WIS涂层表现出优异的阻燃耐火性能,主要归因于:(a)涂层材料中膨胀阻燃体系的酸化、气化等反应,逐渐形成膨胀层;(b)CS参与了膨胀层的成炭反应,促进了膨胀倍率的提升;(c)具有优异耐热性能的FA在燃烧后的残炭中作为耐温材料填补在膨胀层的孔隙中,增加了膨胀层的热稳定性和阻隔能力。

     

  • 图  1  粉煤灰(FA)-壳聚糖(CS)复合阻燃填料的制备示意图

    Figure  1.  Schematic diagram of the preparation of fly ash (FA)- chitosan (CS) composite flame-retardant fillers

    图  2  FA、CS、FA-CS复合阻燃填料的FT-IR光谱

    Figure  2.  FT-IR spectras of FA, CS, FA-CS composite flame-retardant fillers

    图  3  FA、CS、FA-CS复合阻燃填料的XRD谱图

    Figure  3.  XRD spectras of FA, CS, FA-CS composite flame-retardant fillers

    图  4  (a-c) FA的SEM图、其放大图和mapping图;(d-f) CS的SEM图;其放大图和EDS图(g-i) FA-CS复合阻燃填料的SEM图、其放大图和EDS图

    Figure  4.  (a-c) SEM images of FA, its magnification and mapping; (d-f) SEM images of CS, its magnification and EDS (g-i) SEM images of FA-CS composite flame-retardant filler, its magnification and EDS

    图  5  涂层的燃烧前SEM照片及其放大图:(a,b) WIS,(c,d) FA/WIS,(e,f) CS/WIS,(g,h) FA-CS/WIS

    Figure  5.  SEM photographs of the coatings before combustion and their magnifications: (a, b) WIS, (c, d) FA/WIS, (e, f) CS/WIS, (g, h) FA-CS/WIS

    图  6  各涂层的燃烧前后的截面和表面照片:(a) WIS,(b) FA/WIS,(c) WIS/C,(d) FA-CS/WIS

    Figure  6.  Cross-sectional and surface photographs before and after combustion of each coating: (a) WIS, (b) FA/WIS, (c) CS/WIS, (d) FA-CS/WIS

    图  7  不同涂层钢板的背面温度随时间的变化曲线

    Figure  7.  Curves of backside temperature with time for different coated steels

    图  8  涂层的燃烧后SEM照片及其放大图:(a,b) WIS,(c,d) FA/WIS,(e,f) CS/WIS,(g,h) FA-CS/WIS

    Figure  8.  SEM photographs of the coatings after combustion and their magnifications: (a, b) WIS, (c, d) FA/WIS, (e, f) CS/WIS, (g, h) FA-CS/WIS

    图  9  FA-CS/WIS涂层的防火隔热机制

    Figure  9.  Mechanism of fire protection and thermal insulation of FA-CS/WIS coatings

    表  1  水性膨胀型防火涂层的组成比例(wt %)

    Table  1.   Composition ratio of water-based intumescent flame-retardant coatings (wt %)

    CoatingsWAAPPPERMELFACSFA-CSH2O
    WIS45261313///3
    FA/WIS402613135//3
    CS/WIS40261313/5/3
    FA-CS/WIS40261313//53
    Notes: WA, Waterborne emulsions; APP, Ammonium polyphosphate; PER, pentaerythritol; MEL melamine; FA Fly ash; CS Chitosan; FA-CS, Fly ash- Chitosan; WIS, Waterborne Intumescent System; FA/WIS, Fly ash/ Waterborne Intumescent System; CS/WIS, Chitosan/ Waterborne Intumescent System; FA-CS/WIS, Fly ash- Chitosan/Waterborne Intumescent System
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  • 收稿日期:  2024-03-01
  • 修回日期:  2024-04-24
  • 录用日期:  2024-04-27
  • 网络出版日期:  2024-05-30

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