R1234yf has attracted wide attention because of its excellent environmental protection performance. However, the potential flammability hazards of R1234yf will affect its use and promotion. This article will focus on the flammability changes of R1234yf before and after adding different flame retardants. Firstly, the flammability limits of the mixtures of R1234yf+R13I1 and R1234yf+N₂ were tested out. And the critical suppression ratios of the two flame retardants/R1234yf were obtained by analyzing the experimental data. The chemical inhibition mechanism of R13I1 to R1234yf was analyzed, and a brief mechanism for chemical inhibition of flame retardants was obtained from two stages. Then, in order to more reasonably determine the inhibiting characteristics of flame retardants to flammable refrigerants, a method for evaluating the inhibition properties of flame retardants with three parameters was proposed, including critical suppression ratio, flammability limits range, and inhibition efficiency. And the inhibition characteristics of four flame retardants R13I1, N₂, R134a and R227ea on R1234yf were obtained, respectively. Finally, the global warming potential and flammability limits (or critical suppression ratios) of three mixtures were compared based on a new two-coordinate schematic diagram, which can comprehensively compare the environmental protection and safety of binary mixtures. The results will provide references for reducing the combustibility hazards of R1234yf and searching for new refrigerants.

R1234yf的出色环保性能引起了广泛关注。但是，R1234yf的潜在易燃性危害将影响其使用和推广。本文将重点介绍在添加不同的阻燃剂前后，R1234yf的可燃性变化。首先，R1234yf + R13I1和R1234yf + N ₂混合物的可燃性极限被测试了。通过分析实验数据，得出了两种阻燃剂/ R1234yf的临界抑制比。分析了R13I1至R1234yf的化学抑制机理，并从两个阶段获得了简要的阻燃剂化学抑制机理。然后，为了更合理地确定阻燃剂对可燃制冷剂的抑制特性，提出了一种通过临界抑制比，可燃极限范围和抑制效率这三个参数评价阻燃剂的抑制性能的方法。以及四种阻燃剂R13I1，N ₂的抑制特性分别获得R1234yf上的R134a和R227ea。最后，根据新的二坐标示意图，比较了三种混合物的全球变暖潜势和可燃极限（或临界抑制比），可以全面比较二元混合物的环境保护和安全性。该结果将为减少R1234yf的可燃性危害和寻找新的制冷剂提供参考。