Ng Yan Hao, Zope Indraneel Suhas, Dasari Aravind, Tan Kang Hai
School of Civil and Environmental Engineering (Blk. N1), Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
School of Materials Science and Engineering (Blk. N4.1), Nanyang Technological University, 50 Nanyang Avenue, Singapore 639789, Singapore.
Polymers (Basel). 2020 Oct 2;12(10):2271. doi: 10.3390/polym12102271.
Material-scale tests involving milligrams of samples are used to optimize fire-retardant coating formulations, but actual applications of these coatings require them to be assessed with structural-scale fire tests. This significant difference in the scale of testing (milligrams to kilograms of sample) raises many questions on the relations between the inherent flammability and thermal characteristics of the coating materials and their "performance" at the structural scale. Moreover, the expected "performance" requirements and the definition of "performance" varies at different scales. In this regard, the pathway is not established when designing and formulating fire-retardant coatings for structural steel sections or members. This manuscript explores the fundamental relationships across different scales of testing with the help of a fire-protective system based on acrylic resin with a typical combination of intumescent additives, . ammonium polyphosphate, pentaerythritol, and expandable graphite. One of the main outcomes of this work dictates that higher heat release rate values and larger amounts of material participating in the pyrolysis process per unit time will result in a rapid rise in steel substrate temperature. This information is very useful in the design and development of generic fire-retardant coatings.
涉及毫克级样品的材料尺度测试用于优化防火涂料配方，但这些涂料的实际应用需要通过结构尺度的火灾测试对其进行评估。测试尺度（从毫克级样品到千克级样品）的这一显著差异引发了许多关于涂料材料固有可燃性和热特性与其在结构尺度上“性能”之间关系的问题。此外，不同尺度下预期的“性能”要求和“性能”的定义各不相同。在这方面，在为结构钢构件设计和配制防火涂料时，尚未建立起相应的途径。本论文借助一种基于丙烯酸树脂并含有典型膨胀型添加剂组合（聚磷酸铵、季戊四醇和可膨胀石墨）的防火系统，探索了不同测试尺度之间的基本关系。这项工作的主要成果之一表明，更高的热释放速率值以及单位时间内参与热解过程的材料量增加，将导致钢基材温度迅速升高。这些信息在通用防火涂料的设计和开发中非常有用。
