新型气体灭火剂对飞机用橡胶材料的腐蚀性能研究

Study on corrosivity of new gas fire extinguishing agents to aircraft rubber materials

为研究氢氟烯烃(HFOs)与氢氟氯烯烃(HCFOs)灭火剂对于飞机用橡胶密封材料的腐蚀性,通过实验研究6种新型气体灭火剂(R1234yf,R1234ze,R1234ze-E,R1233xf,R1233zd,R1336mzz-E),对目前飞机用4种橡胶O型圈(硅橡胶VMQ,氟橡胶FKM,氟硅橡胶FVMQ和丁腈橡胶NBR)的腐蚀作用。在70℃,0.1 MPa工况下开展腐蚀实验,对实验前后橡胶的性能参数进行测试,并结合红外测试结果进行性能下降分析。结果表明:R1336mzz-E可对FKM造成腐蚀,样品拉伸强度下降20.91%,拉断伸长率下降44.28%,且表面褪色、开裂;FVMQ在R1234ze气氛中发生严重的交联老化反应,拉伸强度下降44.4%;R1336mzz-E对FVMQ造成腐蚀,暴露后拉伸强度下降39.96%。

In order to study the corrosivity of hydrofluoroolefins(HFOs)and hydrochlorofluoroolefins(HCFOs)fire extinguishing agents to the aircraft rubber sealing materials,the corrosion effect of six kinds of new gas fire extinguishing agents(R1234yf,R1234ze,R1234ze-E,R1233xf,R1233zd,R1336mzz-E)on four kinds of rubber O-rings including the silicone rubber(VMQ),fluorosilicone rubber(FKM),fluorosilicone rubber(FVMQ)and nitrile rubber(NBR)used in aircraft at present was studied through the experiments.The corrosion experiments were studied under the conditions of 70℃and 0.1 MPa,then the performance parameters of rubber before and after the experiments were measured,and combined with the results of infrared testing,the performance degradation analysis was conducted.The results showed that R1336mzz-E caused corrosion to FKM,the tensile strength and elongation at break of sample decreased by 20.91%and 44.28%,respectively,and the surface of FKM was discolored and cracked.FVMQ was seriously crosslinked and aged in R1234ze atmosphere,and the tensile strength decreased by 44.4%.R1336mzz-E caused corrosion to FVMQ,and the tensile strength after exposure decreased by 39.96%.