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制备了白色粉末状的有机膦酸—1-氨基乙叉-1,1-二膦酸(AEDP)。将AEDP及其与三聚氰胺(MEL)、季戊四醇(PER)复配得到的协效组合物作为阻燃剂对聚丙烯(PP)进行阻燃,考察了AEDP及其协效组合物对PP阻燃性能的影响。结果表明:AEDP及其协效组合物AEDP/MEL/PER均能显著提高PP的阻燃性能。其中当AEDP作为单组分阻燃剂且用量为27%时,阻燃试样(PP-Ⅱ)通过UL 94V-0测试,其极限氧指数(LOI)值达到24.4%。当AEDP/MEL/PER协效阻燃剂(复配比为12:8:5)的用量为25%时,阻燃试样(PP-Ⅶ)通过UL94V-0测试,其LOI值达到29.2%。锥形量热分析结果显示,纯PP、PP-Ⅱ和PP-Ⅶ的峰值热释放速率分别为779、322和252 kW/m~2。其中,PP-Ⅱ在锥形量热测试后形成了致密且厚实的残余物,热分解过程中形成的这种致密残余物层可通过固相隔绝原理对材料起到阻燃作用。
An organic phosphonic acid 1-aminoethylidene-1,1-diphosphonic acid (AEDP) was prepared as a white powder. Flame retardant polypropylene (PP) was flame-retarded with synergistic combination of AEDP and melamine (MEL) and pentaerythritol (PER). The effects of AEDP and its synergistic composition on flame retardancy of PP Impact. The results showed that AEDP and its synergistic composition AEDP / MEL / PER can significantly improve the flame retardancy of PP. Flame retardant sample (PP-Ⅱ) passed the UL 94V-0 test when the content of AEDP was 27% and the limiting oxygen index (LOI) value reached 24.4%. Flame retardant sample (PP-Ⅶ) passed the UL94V-0 test with an LOI value of 29.2% when the dosage of AEDP / MEL / PER synergistic flame retardant (compounding ratio 12: 8: 5) . Cone calorimetric analysis showed that the peak heat release rates of pure PP, PP-Ⅱ and PP-Ⅶ were 779, 322 and 252 kW / m ~ 2, respectively. Among them, PP-Ⅱ formed a dense and thick residue after the conical calorimetry test. The dense residual layer formed during the thermal decomposition process can play a role of flame retardant to the material by solid-phase insulation principle.