白炭黑对缩合型RTV-2硅橡胶密封垫片性能的影响

Effects of Silica on Properties of the RTV-2 Silicone Rubber Sealant

采用不同型号的白炭黑补强缩合型双组分RTV-2硅橡胶密封垫片,研究了白炭黑种类及疏水性气相法白炭黑用量对密封胶的流变性能、力学性能、热空老化性能及耐ASTM3#油性能的影响。结果表明:添加疏水性白炭黑较添加亲水性白炭黑的胶料的流变性能更好,且硫化速度比较稳定、缓和;添加疏水性气相法白炭黑的胶料的力学性能及耐热空老化性能均优于其他类型白炭黑,且随用量的增多力学性能改善,耐油性能提升,但耐热性能有所下降;亲水性白炭黑的耐ASTM3#油性能优于疏水性白炭黑。

Different kinds of silica as reinforcing fillers were used to fill in two-component room temperature vulcanization （RTV -2） silicone rubber sealant. The effects of different kinds of silica and hydrophobic silica adding dosage on the rheological property, mechanical properties, thermal aging properties and ASTM3# oil resist- ance of silicone rubber sealant were studied. The research showed that the RTV - 2 silicone rubber sealant filled with the hydrophobic sihca has better theological property. The curing rate of the based-compound filled with the hy- drophobic silica was slower and more stable than that filled with the hydrophilicity silica. The mechanical properties and thermal aging properties of silicone rubber sealant filled with the other fillers was inferior to that fiUed with the hydrophobic silica,but the ASTM3# oil resistance performance on the contrary. As the silica content increased, the mechanical properties and ASTM3# oil resistance of silicone rubber sealant were improved while the thermal aging properties of them reduced.