聚磷酸铵和微囊化聚磷酸铵对NR/BR复合材料的性能影响

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中图分类号：TQ330.7 文献标志码：A 文章编号：1002-4026（2025）04-0086-09

Abstract：Asacommon flame retardant，ammonium polyphosphate（APP）can considerably improve the flame retardancy of rubber，but the molecular structure of APP shows that it contains alarge number of ammonium phosphate groups，renderingit highly hygroscopic.Toaddress this hygroscopicisueof APP，microencapsulatedAPP（MF201）was obtained by coating APP microcapsules with melamine resin.Although MF201can solvethe hygroscopic issue of APP，the presence of microencapsulated shels mayafect the properties of rubber.To studythe diference between the two flame retardants，APPand MF201 were introduced intoanatural rubber/butadienerubber（NR/BR）compositeto investigate theirimpactsonthe hardness，flameretardancy，wearresistance，andother physicaland mechanical propertiesof NR/BR composites.The resultsshow that the adition of APPand MF20l canimprove the flame retardancy，hardness， mechanical properties，and wear resistance of NR/BR composites.Due tothe plasticizing efect of the melamine resin shell，the hardness of NR/BR composites decreases slightly when MF20l isadded.Furthermore，APPand MF201improve theflame retardancy of NR/BR composites to the same extend.For example，45 phr APP and MF201 increase the limiting oxygen index of NR/BR composites to 25.5% and their UL-94 combustion rating to HB.In addition， the effects of APP and MF201 on wear resistance are basicall the same.The NR/BRcomposites with MF20ladded have lower hardness and higherelongationatbreak.Therefore，the microencapsulatedshelldidnotchange theflameretardantandwearresistance of APP to NR/BR composites，but increased the elongation at break and reduced the hardness.

Key words ： phosphorous flame retardant;flame retardancy; wear; natural rubber; butadiene rubber

天然橡胶（NR）具有优异的加工性能和力学性能[1-3]，顺丁橡胶（BR）作为通用合成橡胶，具有优异的耐磨性[4]，两者并用成为兼备耐磨、优异力学性能和易加工性能的橡胶材料，但这两种橡胶阻燃性较差，难以用于阻燃性橡胶材料。（剩余9184字）