增塑剂对低温氟橡胶性能的影响

研究增塑剂邻苯二甲酸二辛酯（DOP）、偏苯三酸三辛酯（TOTM）、甲基氟硅油对低温氟橡胶（以下简称氟橡胶）流变性能、硫化特性、物理性能、耐低温性能的影响。结果表明：添加DOP、TOTM、甲基氟硅油可以改善氟橡胶混炼胶的流动性，添加甲基氟硅油的氟橡胶混炼胶的挤出物表面更为光滑；添加甲基氟硅油的氟橡胶混炼胶的Fmax－FL较大，硫化胶的拉伸强度更高，高温压缩永久变形较小；添加DOP和TOTM的氟橡胶硫化胶的耐低温性能变化不大，添加甲基氟硅油可以提升氟橡胶硫化胶的耐低温性能，降低脆性温度4 ℃，增大压缩耐寒因数。

Effect of Plasticizers on Properties of Low-temperature Fluororubber

Study the effects of plasticizers dioctyl phthalate（DOP），trioctyl trimellitate（TOTM）and methyl fluorosilicone oil on the rheological properties，vulcanization characteristics，physical properties and low-temperature resistance of the low-temperature fluororubber (hereinafter referred to as fluororubber).The results showed that the addition of DOP，TOTM and methyl fluorosilicone oil could improve the flowability of the fluororubber compound，and the extruded surface of the fluororubber compound with methyl fluorosilicone oil was smoother.The Fmax－FL of fluororubber compound with added methyl fluorosilicone oil was larger，the tensile strength of the vulcanizate was higher，and the high-temperature compression permanent set was smaller.The low-temperature resistance of the fluororubber vulcanizates with DOP and TOTM had a little change.Adding methyl fluorosilicone oil could improve the low-temperature resistance of the fluororubber vulcanizate，reduce the brittleness temperature by 4 ℃，and increase the compression cold resistance coefficient.