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A new approach designed for improving flame retardancy of intumescent polypropylene via continuous extrusion with supercritical CO2

机译：一种新的方法，设计用于通过连续挤出与超临界CO2的连续挤出改善膨胀聚丙烯的阻燃性

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摘要

The objective of this study was to explore a new approach to enhance the flame retardancy of polypropylene/intumescent flame retardant (PP/IFR) composites through improving IFR dispersion via continuous extrusion with supercritical carbon dioxide (scCO(2)) as the processing medium. The IFR used in this study consisted of ammonium polyphosphate (APP) and pentaerythritol (PER) at a weight ratio of 3 : 1. Scanning electron microscopy (SEM) was applied to study the dispersion of IFR in the PP composites prepared in the presence of different contents of scCO(2). Thermogravimetric analysis (TGA) was carried out to study the effect of IFR dispersion on the thermal stability and the yield of char residues of the PP composites. A plastic smoke generation tester was applied to study the specific optical density under a thermal irradiance. SEM was then used to study the morphologies of the intumescent char formed after the smoke testing. Limiting oxygen index (LOI) and vertical burning test (UL-94) ratings were evaluated to study the effect of IFR dispersion on the flame retardancy of the PP composites. It was found that scCO(2) as the processing medium could significantly improve IFR dispersion and thus increase the efficiency of the flame retardant and enhance the flame retardancy of the PP composites. This new approach could allow PP composites to pass the UL-94 V-0 rating at a lower IFR content. Possible mechanisms were proposed for the scCO(2)-aided IFR dispersion and the improved flame retardancy of the PP composites.
机译：本研究的目的是探讨通过通过连续挤出与超临界二氧化碳（SCCO（2））作为加工介质的连续挤出来增强聚丙烯/膨胀阻燃剂（PP / IFR）复合材料的燃烧性的新方法。本研究中使用的IFR由多磷酸铵（APP）和季戊四醇（PER）以3：1的重量比组成。扫描电子显微镜（SEM）被应用于研究IFR在存在于存在的PP复合材料中的分散体SCCO的不同内容（2）。进行热重分析（TGA）以研究IFR分散对PP复合材料的热稳定性的影响和炭残余物的效果。应用塑料烟雾发电测试仪在热辐照度下研究比光密度。然后使用SEM研究烟雾测试后形成的膨胀型Char的形态。评价限制氧指数（LOI）和垂直燃烧试验（UL-94）评级，以研究IFR分散对PP复合材料的阻燃性的影响。发现SCCO（2）作为处理介质可以显着提高IFR分散，从而提高阻燃剂的效率，增强PP复合材料的阻燃性。这种新方法可以允许PP复合材料通过较低的IFR内容通过UL-94 V-0等级。提出了SCCO（2）的IFR分散和PP复合材料的改善阻燃性的可能机制。

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  • 来源
    《RSC Advances》 |2016年第113期|共9页
  • 作者

    Huang Pengke; Pang Yongyan; Zhang Lihua; Wu Fei; Zhang Shuhai; Zheng Wenge;

  • 作者单位

    Chinese Acad Sci Ningbo Key Lab Polymer Mat Polymers &

    Composites Div Ningbo Inst Mat Technol &

    Engn 1219 Zhongguan West Rd Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Key Lab Polymer Mat Polymers &

    Composites Div Ningbo Inst Mat Technol &

    Engn 1219 Zhongguan West Rd Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Key Lab Polymer Mat Polymers &

    Composites Div Ningbo Inst Mat Technol &

    Engn 1219 Zhongguan West Rd Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Key Lab Polymer Mat Polymers &

    Composites Div Ningbo Inst Mat Technol &

    Engn 1219 Zhongguan West Rd Ningbo 315201 Zhejiang Peoples R China;

    North Univ China Sch Chem &

    Environm Engn Taiyuan 030051 Shanxi Peoples R China;

    Chinese Acad Sci Ningbo Key Lab Polymer Mat Polymers &

    Composites Div Ningbo Inst Mat Technol &

    Engn 1219 Zhongguan West Rd Ningbo 315201 Zhejiang Peoples R China;

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