热氧化对锶铁氧体填充的天然橡胶力学性能影响

Effect of Thermal Oxidation on the Mechanical Properties of Nature Rubbers Filled with Strontium Ferrite

摘要: 将锶铁氧体添加到天然橡胶，采用常规工艺制备出来橡胶复合材料，研究了铁氧体添加量(10，25，50，100 phr)对所得橡胶复合材料的物理机械性能研究的影响，并研究了热空气对橡胶复合材料的物理机械性能影响。结果表明，随着锶铁氧体添加量的增加，橡胶复合材料的物理机械性能先增加后降低，在热老化箱中70℃老化72 h老化后橡胶复合材料的物理机械性能变化很小，而天然橡胶的拉伸强度和扯断伸长率急剧下降，表明锶铁氧体的添加有利于提高天然橡胶的抗热氧化性能，有望拓展天然橡胶应用范围。

Abstract: Rubber composites composed of nature rubber (NR) and strontium ferrite (SrFe12O19) were prepared by conventional process. The effects of different contents (10, 25, 50, 100 phr) of SrFe12O19 on the physical and mechanical properties of as-prepared NR composites were investigated. And the effects of thermal oxidation on the properties of rubber composites were studied. The results show that mechanical properties of rubber composites increase first, and then decrease with the increase of SrFe12O19 amounts in NR. The mechanical properties of rubber composites have changed little, but the tensile strength and elongation at break of rubber composites without SrFe12O19 decrease greatly after thermal oxidation in heat aging box at 70˚C for 72 h. It implies that SrFe12O19 has increased the properties of heat aging resistance of NR. It is expected to expand the application fields of NR.