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Calcium carbonate and ammonium polyphosphate flame retardant additives formulated to protect ethylene vinyl acetate copolymer against fire: Hydrated or carbonated calcium?
Journal of Vinyl and Additive Technology ( IF 2.7 ) Pub Date : 2020-08-31 , DOI: 10.1002/vnl.21800
Fouad Laoutid 1 , Henri Vahabi 2 , Elnaz Movahedifar 3 , Pascal Laheurte 4 , Christelle Vagner 2 , Marianne Cochez 2 , Loïc Brison 1 , Mohammad Reza Saeb 2
Affiliation  

In this study, the effect of the chemical nature of different calcium (Ca)‐based minerals as flame retardant additives in combination with ammonium polyphosphate (APP), in 1:1 proportions, on the flame retardancy behavior and performance of ethylene vinyl acetate copolymer was discussed. Combining APP with partly and completely hydrated calcium oxide led to superior flame‐retardant function detected in mass loss calorimeter measurements with respect to the corresponding system containing carbonated calcium. This privileged character was attributed to the higher reactivity of hydrated Ca‐based fillers toward APP in comparison with Ca carbonate, which induced the formation of an intumescent residue. The difference between reactivity potential of hydrated and dry Ca was demonstrated by the newly formed thermally stable species, and further evidenced by thermogravimetric analysis performed on APP/fillers blends. Moreover, the presence of more crystalline domains in the Ca/phosphorus‐based compounds was evidenced by XRD analysis of the mass loss calorimeter test residues. The results of this work highlight the role of blend additive systems on the performance of flame retardancy of polymer materials.

中文翻译:

碳酸钙和聚磷酸铵阻燃添加剂,旨在保护乙烯乙酸乙烯酯共聚物免受火灾:水合或碳酸钙?

在这项研究中,以阻燃剂添加剂钙(Ca)为基础的矿物与聚磷酸铵(APP)的比例为1:1的不同,其化学性质对乙烯乙酸乙烯酯共聚物的阻燃性能和性能的影响进行了讨论。将APP与部分和完全水合的氧化钙结合使用,相对于相应的含碳酸钙的系统,在质量损失量热仪测量中可检测到卓越的阻燃功能。与碳酸钙相比,水合的钙基填料对APP的反应性更高,这是这种特权的特征,碳酸钙诱导了膨胀残余物的形成。新形成的热稳定物质证明了水合钙和干燥钙的反应电位之间的差异,并通过对APP /填料共混物进行热重分析进一步证明。此外,通过质量损失量热计测试残留物的XRD分析证明,在基于Ca /磷的化合物中存在更多的晶域。这项工作的结果突出了共混添加剂体系对聚合物材料阻燃性能的作用。
更新日期:2020-08-31
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