中国塑料 ›› 2022, Vol. 36 ›› Issue (7): 129-135.DOI: 10.19491/j.issn.1001-9278.2022.07.018

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次磷酸盐⁃环四硅氧烷双基化合物复配二乙基次磷酸铝对PA6的阻燃性能研究

魏思淼1, 邵路山2, 许准3, 刘艳婷1, 赵思衡1, 许博1()   

  1. 1.北京工商大学化学与材料工程学院,北京 100048
    2.北京建筑材料检验研究院有限公司,北京 100041
    3.郑州财税金融职业学院,郑州 450048
  • 收稿日期:2021-12-13 出版日期:2022-07-26 发布日期:2022-07-20
  • 通讯作者: 许博(1982—),男,副教授,博士,硕士生导师,从事阻燃材料领域研究工作,xubo@btbu.edu.cn
    E-mail:xubo@btbu.edu.cn
  • 基金资助:
    北京市自然科学基金(2192014);北京市教委科技计划一般项目(KM2020101001);北京工商大学2022年研究生科研能力提升计划

Flame⁃retardant performance of PA6 modified with hypophosphite/siloxane bi⁃functional compound and diethyl aluminum hypophosphite compound

WEI Simiao1, SHAO Lushan2, XU Zhun3, LIU Yanting1, ZHAO Siheng1, XU Bo1()   

  1. 1.School of Chemistry and Materials Engineering,Beijing Technology and Business University,Beijing 100048,China
    2.Beijing Building Materials Testing Academy Co,Ltd,Beijing 100041,China
    3.Zhengzhou Vocational College of Finance and Taxation,Zhengzhou 450048,China
  • Received:2021-12-13 Online:2022-07-26 Published:2022-07-20
  • Contact: XU Bo E-mail:xubo@btbu.edu.cn

摘要:

将次磷酸盐?环四硅氧烷双基化合物(MVC?AlPi)与二乙基次磷酸铝(AlPi)复配阻燃聚酰胺6(PA6)。目的是考察外加的富磷酸铝化合物中磷酸铝基团和环四硅氧烷基团之间的配比对PA6阻燃效率的影响。结果表明, PA6/8.8 %AlPi/2.2 %MVC?AlPi具有协同屏障效应,可使复合材料的极限氧指数(LOI)值提高到31.5 %,并通过UL 94 V?0级别。相比于纯PA6,PA6/8.8 %AlPi/2.2 %MVC?AlPi的热释放速率峰值(PHRR)降幅近50 %、总热释放量(THR)也降低了15 %,PA6/8.8 %AlPi/2.2 %MVC?AlPi的残炭率虽略低于11 %MVC?AlPi,却形成了内层坚硬,外层类陶瓷化的双层炭层结构,MVC?AlPi、AlPi与PA6的相互作用可以锁定更多P、C碎片,促进由含硅富磷残渣组成的屏障保护炭层的形成。在阻燃剂添加总量不变的情况下,通过调节各组分的比例,发挥出更好的协同阻燃效果。

关键词: 次磷酸盐?环四硅氧烷双基化合物, 协同屏障保护效应, 聚酰胺6, 阻燃

Abstract:

A hypophosphite/siloxane bi?functional compound (MVC?AlPi) and a diethyl aluminum hypophosphite compound (AlPi) were combined as a complex flame retardant to enhance the flame retardancy of polyamide 6 (PA6). The effect of the aluminum hypophosphite/ siloxane weight ratio in the aluminum phosphate?rich compound on the flame?retardant efficiency of PA6 was investigated. The results indicated that there was a synergistic barrier and protective effect on the PA6 composite at a MVC?AlPi/AlPi weight ratio of 2.2/8.8. This made the PA6 composite obtain an improved limiting oxygen index of 31.5 vol% and reach a flammability rating of UL 94 V?0 in the vertical burning experiment. The composite exhibited a decrease in peak heat release rate by approximately 50 % compared to pure PA6, and meanwhile the total heat release decreased by 15 %. The PA6 composite with 2.2 wt% MVC?AlPi and 8.8 wt% AlPi showed a lower char yield than that the composite with 11 wt% MVC?AlPi. A two?layer carbon structure with a hard inner layer and a ceramic?like outer layer was observed from the residual char of the composite after combustion. The interaction of MVC?AlPi, AlPi, and PA6 could lock more P and C fragments, promoting the formation of a barrier protective carbon layer based on the silicon?containing phosphorus?rich residue. A better synergistic flame retardant effect could be achieved through adjusting the ratio of each component at the fixed total amount of flame retardants.

Key words: hypophosphite/siloxane bi?group compound, synergistic barrier and protective effect, polyamide 6, flame retardant

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