磷化瓜尔胶与APP协同阻燃PLA的性能研究

›› 2023, Vol. 37 ›› Issue (4): 53-59.

磷化瓜尔胶与APP协同阻燃PLA的性能研究

刘会媛¹,马闯²,关俊霞³,李繁麟³,杨笑春¹,张青³

1. 唐山师范学院化学系
2. 河北民族师范学院
3. 唐山师范学院

收稿日期:2023-01-16 修回日期:2023-02-10 出版日期:2023-04-26 发布日期:2023-04-26
基金资助:
唐山市人才资助项目

Synergistic flame retardancy of phosphatized guar gum/ammonium polyphosphate on poly（lactic acid）

Received:2023-01-16 Revised:2023-02-10 Online:2023-04-26 Published:2023-04-26

摘要/Abstract

摘要： 采用9，10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）和1，2，3，6-四氢邻苯二甲酸酐（THPA）对瓜尔胶（GG）进行改性得到磷化瓜尔胶（DTGG），并通过核磁共振和傅里叶变换红外光谱对其结构进行表征。以DTGG为碳源，聚磷酸铵（APP）为酸源和气源对聚乳酸（PLA）进行阻燃改性。通过垂直燃烧（UL 94）、极限氧指数（LOI）和锥形量热仪（CONE）对PLA共混物的阻燃性能进行测试。采用热失重分析（TG）和场发射扫描电子显微镜（FESEM）对其热性能和形貌进行表征。结果表明，当DTGG/APP的质量比为9/11时，LOI值为33.4 %，达到UL 94 V-0等级。同时，样品的总热释放（THR）值最低，与纯PLA 相比降低了33.8 %。从FESEM观察到阻燃剂在PLA基质中分布均匀。DTGG和APP的协同作用有效地增强了PLA共混物的阻燃性能。最后讨论了DTGG和APP对PLA共混物的协同阻燃作用机制。

关键词: 聚乳酸, 瓜尔胶, 聚磷酸铵, 阻燃性

Abstract: Phosphating guar gum （DTGG） was obtained through the modification of guar gum （GG） with 9，10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide （DOPO） and 1，2，3，6-tetrahydrophthalic anhydride （THPA）， and its chemical structure was determined using Fourier-transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. Flame-retardant poly（lactic acid）（PLA） blends were prepared through melt-blending PLA with DTGG as a carbon source and ammonium polyphosphate （APP） as acid and gas sources. The flame retardant properties of the resulting blends were investigated through vertical burning experiments （UL 94）， limiting oxygen index （LOI）， and the cone calorimeter tests， and their thermal properties and morphology were characterized through thermogravimetric analysis and field-emission scanning electron microscopy （FESEM）. The results indicated that the blends obtained an LOI value of 33.4 vol% at a DTGG/APP mass ratio of 9/11 and achieved a UL 94 V-0 classification in the vertical burning experiment. Meanwhile， the blends showed the lowest total heat release （THR） value， which decreased by 33.8% compared to that of pure PLA. The uniform distribution of DTGG and APP in the PLA matrix was found from the FESEM observation. The synergistic effect of DTGG and APP effectively enhanced the flame retardancy of PLA. The synergistic mechanism of DTGG and APP for the flame retardancy of PLA was also proposed.

Key words: poly（lactic acid）, guar gum, ammonium polyphosphate, flame retardancy

刘会媛马闯关俊霞李繁麟杨笑春张青. 磷化瓜尔胶与APP协同阻燃PLA的性能研究[J]. , 2023, 37(4): 53-59.

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