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Development of Intumescent Flame Retardant for Polypropylene: Bio-epoxy Resin Microencapsulated Ammonium-polyphosphate

阻燃剂 膨胀的 聚磷酸铵 炭化 锥形量热计 材料科学 烧焦 聚丙烯 复合材料 碳化 发泡剂 化学工程 热解 聚氨酯 扫描电子显微镜 工程类
作者
Thuy Tien Nguyen Thanh,Kata Enikő Decsov,Katalin Bocz,György Marosi,Beáta Szolnoki
出处
期刊:Periodica Polytechnica Chemical Engineering [Budapest University of Technology and Economics]
卷期号:66 (2): 313-324 被引量:3
标识
DOI:10.3311/ppch.19468
摘要

As polypropylene (PP) has no charring ability on its own due to the lack of hydroxyl functional groups, the flame retardant system needs the addition of carbonizing agent in a relatively great amount. Ammonium-polyphosphate (APP), a conventional flame retardant additive was modified by microencapsulation with a sorbitol-based bioepoxy resin shell to create an intumescent flame retardant system with enhanced charring ability for PP. The flame retardant efficiency of the microencapsulated additive, which contains all the components needed in an effective intumescent flame retardant system, was evaluated in PP matrix at different loadings.When compared to the physical mixture of the component, the microencapsuated form of APP (MCAPP) was found to have improved flame retardant efficiency in PP. The LOI values of the MCAPP containing PP samples increased by 8–11 V/V% besides achieved V-0 classification according to the UL94 test. During cone calorimeter tests, the burning intensity was reduced (peak of heat release rate decreased by 20–35% and shifted in time), increased amount of charred residue was obtained, and based on the calculated Flame Retardancy Index (FRI) “Excellent” fire performance was achieved when MCAPP was used. The improved flame retardant performance is attributed to the effective interaction between the APP core and the readily available carbonizing shell, which promoted the formation of increased amount of char accompanied with improved heat protecting and barrier efficiency.
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