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首页> 外文期刊>Polymer Composites >Microencapsulation of Ammonium Polyphosphate: Preparation, Characterization, and Its Flame Retardance in Polypropylene
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Microencapsulation of Ammonium Polyphosphate: Preparation, Characterization, and Its Flame Retardance in Polypropylene

机译：聚磷酸铵的微囊化：聚丙烯中的制备，表征及其阻燃性

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摘要

Microencapsulated ammonium polyphosphate (MCAPP) with a melamine-formaldehyde (MF) resin coating layer was prepared by in situ polymerization. MCAPP was characterized by Fourier transform infrared, X-ray pho-toelectron spectroscopy, and so on. The results show that the microencapsulation with MF resin leads to a decrease in the particles' size and water absorption. The flame retardant action and mechanism of MCAPP and ammonium polyphosphate (APP) in polypropylene are studied using limiting oxygen index (LOI) and UL 94 test, and their thermal stability is evaluated by ther-mogravimetric analysis. The LOI value of the PP/ MCAPP composite at 30 wt% loading is 30.5%, whereas the corresponding value of the PP/APP composite is only 20%. Moreover, the LOI values of the PP/MCAPP/ PER composites are higher than the ones of the PP/ APP/PER composites. In the UL 94 test, the PP/ MCAPP/PER composites with suitable ratios of MCAPP to PER can reach the V-0 rating, and the best rating of the PP/APP/PER composites is V-1.
机译：通过原位聚合制备具有三聚氰胺-甲醛（MF）树脂涂层的微囊化聚磷酸铵（MCAPP）。 MCAPP的特征在于傅立叶变换红外光谱，X射线光电子能谱等。结果表明，MF树脂的微囊化导致颗粒尺寸和吸水率的降低。采用极限氧指数（LOI）和UL 94试验研究了MCAPP和聚磷酸铵（APP）在聚丙烯中的阻燃作用和机理，并通过热重分析法评估了它们的热稳定性。 PP / MCAPP复合材料在30 wt％的载荷下的LOI值为30.5％，而PP / APP复合材料的相应LOI值仅为20％。而且，PP / MCAPP / PER复合材料的LOI值高于PP / APPAPP / PER复合材料的LOI值。在UL 94测试中，具有合适的MCAPP与PER比率的PP / MCAPP / PER复合材料可以达到V-0等级，而PP / APP / PER复合材料的最佳等级是V-1。

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