Flame retardant PP/PA6 blends: A recipe for recycled wastes

H. Vahabi, L. Dumazert, R. Khalili, M. Saeb, J. L. Cuesta
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引用次数: 4

Abstract

Abstract Disposal of plastics in the form of discarded scrap or waste is an environmental nightmare to the developed and under-developing countries. In this sense, modern technologies are every day growing; meanwhile recycling wastes are taking credit for higher performance to pave the way towards a cleaner planet. Recycling of polymer blends is associated with serious complexities in finding appropriate additives acting in each phase or at the interface of non-miscible polymers to attain materials with higher properties. A flame retardant system was designed and intended to play the role of typical recycled flame retardant polypropylene/polyamide (PP/PA6) blends by incorporation of two kinds of talc, sepiolite, and a phosphorus-based flame retardant. First, two types of talcs having different physical properties were added to PA6 in combination with melamine cyanurate (MC) or melamine pyrophosphate (MPP) to find the one acting as a barrier during combustion. Then, high-aspect-ratio talc that appeared more effective in the first-stage survey was then used in combination with MC, MPP and ammonium polyphosphate (APP) together with a compatibilizer for PP/PA6 blend. Then, thermogravimetric analysis (TGA), microcalorimeter of combustion (PCFC) and cone calorimeter measurements were performed to study thermal degradation and flammability behavior. The results are indicative of successful formulation of flame retardant system containing the aforementioned precursors to be intended to the recycled PP/PA6 blends.
阻燃PP/PA6共混物:回收废物的配方
以废弃废料或废物的形式处理塑料是发达国家和欠发达国家的环境噩梦。从这个意义上说,现代技术每天都在发展;与此同时,回收废物也因其更高的性能而受到赞誉,为更清洁的地球铺平了道路。聚合物共混物的回收与寻找在每一相或在非混溶聚合物界面处起作用的适当添加剂以获得具有更高性能的材料的复杂性有关。通过掺入两种滑石、海泡石和磷系阻燃剂,设计了一种阻燃体系,旨在发挥典型的再生阻燃聚丙烯/聚酰胺(PP/PA6)共混物的作用。首先,将两种具有不同物理性质的滑石粉与三聚氰胺氰尿酸盐(MC)或三聚氰胺焦磷酸(MPP)混合加入PA6中,寻找在燃烧过程中起屏障作用的滑石粉。然后,高纵横比滑石粉在第一阶段的调查中表现得更有效,然后与MC、MPP和聚磷酸铵(APP)以及PP/PA6共混物的增容剂一起使用。然后,通过热重分析(TGA)、燃烧微热量计(PCFC)和锥形量热计测量来研究其热降解和可燃性行为。结果表明,含有上述前驱体的阻燃体系的成功配方将用于再生PP/PA6共混物。
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