Two phosphorus-nitrogen flame retardants were synthesized by using chlodiphenylphosphine (CDP) or diphenylphosphinyl chloride (DPP) and cytosine (Cy), respectively. The products are marked as CCDP and CDPP, and characterized by using Fourier transform infrared spectra (FT-IR), ³¹P and ¹H nuclear magnetic resonance and thermogravimetric analysis (TGA). The CCDP and CDPP were used to modify the flame retardancy of polyamide 6 (PA6). The results indicated that 6 wt% CCDP and CDPP both make PA6 achieve the UL-94 V-0 rating and improve its LOI value. The degradation behavior was studied by TG-IR, melt volume-flow rate, etc. The results revealed that both CCDP and CDPP promote the degradation of PA6 and improve its flame retardancy by melting away. The CCDP tends to work in the gas phase and the CDPP in the condensed phase. In addition, in order to reduce the effect of flame retardant on the mechanical properties of PA6, CDPP was coated with epoxy resin. The results showed that the flame retardancy decrease after coating. Finally, melamine cyanurate was blended with the CDPP coated by epoxy to adjust the comprehensive properties of PA6 composite, and excellent flame retardancy and mechanical properties are obtained.

分别使用氯二苯膦（CDP）或二苯基次膦酰氯（DPP）和胞嘧啶（Cy）合成了两种磷氮阻燃剂。产品标记为CCDP和CDPP，并通过傅里叶变换红外光谱（FT-IR），³¹ P和¹表征H核磁共振和热重分析（TGA）。CCDP和CDPP用于改性聚酰胺6（PA6）的阻燃性。结果表明，6重量％的CCDP和CDPP均使PA6达到UL-94 V-0等级并提高其LOI值。通过TG-IR，熔体流动速率等研究了降解行为。结果表明，CCDP和CDPP均可促进PA6的降解并通过融化提高其阻燃性。CCDP倾向于在气相中工作，而CDPP则在冷凝相中工作。此外，为了减少阻燃剂对PA6力学性能的影响，CDPP涂有环氧树脂。结果表明，涂​​布后阻燃性降低。最后，