聚磷酸铵/氢氧化镁复配填充阻燃硅橡胶的研究

摘要

The ammonium polyphosphate/ aluminum hydroxide/ methyl vinyl silicone rubber ( APP/ATH/ MVQ) flame retardant composites were prepared by single APP, ATH, and APP/ATH hybrid fillers, respectively. The effect of the content and the combination-pattern of different fillers on the flame retardancy, mechanical and dielectric properties of the APP/ATH/MVQ composites was discussed. The results showed that the flame retardancy was improved with increasing the content of the flame retardant fillers. And the flame retardancy of the composites filled with APP/ATH hybrid fillers had better flame retardancy than that of the composites filled with single APP or ATH. The Shore A hardness, dielectric constant, and dielectric dissipation factor were all improved with increasing the content of the APP/ATH hybrid fillers. However, the tensile strength and elongation at break were decreased. With the total amount of APP/ATH ( mass fraction was 3=2) of 80, the oxygen index (01) of the rubber was 44% , and the tensile strength, elongation at break, Shore A hardness, dielectric constant and dielectric dissipation factor were 6. 8 Mpa, 438% , 62, 3.92, 249% , respectively.%分别采用聚磷酸铵(APP)、氢氧化铝(ATH)和APP/ATH复配阻燃剂填充甲基乙烯基硅橡胶,制成阻燃型硅橡胶.研究了APP、ATH和APP/ATH用量及复配方式对硅橡胶阻燃性能、介电性能和力学性能的影响.结果表明,硅橡胶的阻燃性能随APP、ATH用量的增加而增加,同等填充量下,APP/ATH复配阻燃剂填充硅橡胶的阻燃性能比单一APP或ATH填充硅橡胶更佳；随着APP/ATH复配阻燃剂用量的增加,硅橡胶的拉伸强度与拉断伸长率降低,邵尔A硬度、介电常数和介质损耗因数增加.当100份硅橡胶中加入80份APP/ATH复配阻燃剂(APP与ATH的质量比为3∶2)时,硅橡胶的氧指数达44％,拉伸强度、拉断伸长率、邵尔A硬度、介电常数及介质损耗因数分别为6.8 MPa、438％、62度、3.92、249％.