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首页> 外文期刊>Journal of Applied Polymer Science >Acrylic-based fire-retardant coatings for steel protection: Employing the concept of in situ ceramization
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Acrylic-based fire-retardant coatings for steel protection: Employing the concept of in situ ceramization

机译：基于丙烯酸的钢保护阻燃涂层：采用原位陶瓷的概念

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摘要

Traditional intumescent coatings are widely used as passive fire-protective coatings for steel structures as they are capable of expanding in the range of 20-50 times the original thickness thereby providing excellent insulation. However, the fragile nature of such residue and susceptibility to thermo-oxidation given their carbonaceous nature are key problematic issues. The concept of in situ ceramization is explored in this work as a means to form inorganic cohesive char with improved rigidity and thermo-oxidative stability. Coating samples were prepared by incorporating ammonium polyphosphate, talc, Mg(OH)(2), and polydimethylsiloxane as additives into acrylic resin at different weight fractions. Thermal analysis and x-ray diffraction have confirmed the reactions between the additives to form various crystalline magnesium phosphate phases, and to a small extent, silicon phosphate, thereby ensuring the thermo-oxidative stability of the residue. This is reiterated by the fire performance tests (by exposing the coatings to a temperature profile in a furnace similar to ISO 834 fire curve). Despite the advantages of rigid char and its thermo-oxidative stability as a result of formation of inorganic phosphates, the lack of swelling has resulted in relatively poor insulation capabilities of the char, and subsequently, compromised the fire protection times (that are in the range of 45-55 min). However, pyrolysis flow combustion calorimeter results of the coatings are promising and have shown a significant drop of up to 70% in the peak of heat release rate values as compared to neat resin.
机译：传统的膨胀型涂料被广泛用作钢结构的被动防火涂料，因为它们能够在原厚度的20-50倍范围内扩展，从而提供优异的隔热性能。然而，鉴于此类残留物的含碳性质，其易碎性和对热氧化的敏感性是关键的问题。本研究探索了原位陶瓷化的概念，将其作为一种形成具有改善刚性和热氧化稳定性的无机内聚炭的方法。将聚磷酸铵、滑石粉、氢氧化镁（2）和聚二甲基硅氧烷作为添加剂添加到丙烯酸树脂中，以不同的重量分数制备涂层样品。热分析和x射线衍射证实了添加剂之间的反应，形成各种结晶磷酸镁相，并在一定程度上形成磷酸硅，从而确保残渣的热氧化稳定性。防火性能测试（通过将涂层暴露在类似于ISO 834防火曲线的熔炉中的温度曲线）重申了这一点。尽管由于无机磷酸盐的形成，刚性炭具有优势和热氧化稳定性，但膨胀不足导致炭的绝缘能力相对较差，从而影响了防火时间（在45-55分钟范围内）。然而，涂层的热解流动燃烧量热仪结果是有希望的，并且与纯树脂相比，热释放率峰值显著下降了70%。

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