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首页> 外文期刊>Polymers for advanced technologies >Micro-intumescent flame retardant polyamide 6 based on cyclic phosphate grafting phenol formaldehyde
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Micro-intumescent flame retardant polyamide 6 based on cyclic phosphate grafting phenol formaldehyde

机译：基于环状磷酸接枝酚醛的微泡型阻燃聚酰胺6

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In this paper, thermoplastic phenol formaldehyde (PF) grafted cyclic neopentyl phosphate (PFCP) was synthesized by using PF and 2,2-dimethyl-1,3-propanediol phosphoryl chloride. It was characterized by Fourier transform infrared spectroscopy (FTIR), 1H and 31P nuclear magnetic resonance (NMR). Compared to PF, PFCP shows improved thermal and thermoxidative stability and allows itself to be used in polyamide 6 (PA6). A micro-intumescent flame retardant system was constructed by using cyclic neopentyl phosphate as acid source, PF as charring agent and PA6 whose decomposition products work as blowing agent. The results showed that PA6/PFCP composite is classified the UL-94V-0 rating and get a LOI value of 35.5% at 25% loading of PFCP. SEM results showed that the outside of char residues is continuous and dense, but the inside is micro-intumescent and porous. XPS analysis of char revealed that most of phosphorus remained in the char layer. All the results suggest that the mode of flame retardant's action for PA6/PFCP composites is shifted from melting away to charring protection with the content of PFCP increasing. The coherent char generated by the decomposition of PFCP contributes most to flame retardancy of PA6. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：本文利用PF和2，2-二甲基-1，3-丙二醇磷酰氯合成了热塑性酚醛接枝的环状新戊基磷酸酯（PFCP）。通过傅里叶变换红外光谱（FTIR），1H和31P核磁共振（NMR）对其进行了表征。与PF相比，PFCP具有更好的热稳定性和热氧化稳定性，可用于聚酰胺6（PA6）。以环状新戊基磷酸酯为酸源，PF为炭化剂，分解产物为发泡剂的PA6，构建了微泡型阻燃体系。结果表明，PA6 / PFCP复合材料属于UL-94V-0等级，在PFCP含量为25％时，LOI值为35.5％。 SEM结果表明，焦炭残留物的外部连续且致密，而内部微膨胀且多孔。 XPS对炭的分析表明，大部分磷保留在炭层中。所有结果表明，随着PFCP含量的增加，PA6 / PFCP复合材料的阻燃剂作用方式已从熔化转变为炭化保护。 PFCP分解产生的相干炭对PA6的阻燃性贡献最大。版权所有（c）2016 John Wiley＆Sons，Ltd.

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