海南气候环境对RTV硅橡胶力学性能影响的研究

Effect of Hainan Climate on Mechanical Properties of RTV Silicone Rubber

将3种室温硫化(RTV)有机硅结构密封胶拉伸粘结性试件放置于海南热带环境试验基地暴露5年,每年取一定数量的试样测试其拉伸粘结性能,研究湿热带气候对其拉伸粘结性能的影响。结果表明,在海南湿热气候环境下连续暴晒5年后,双组分脱醇型有机硅结构密封胶的最大拉伸粘结强度除第1年下降8%外,后面4年都在增长,共增长了14%;单组分脱醇型有机硅结构密封胶的最大拉伸粘结强度在约5%的范围内波动;单组分脱肟型有机硅结构密封胶的最大拉伸粘结强度下降14%。3种密封胶在最大拉伸粘结强度时的伸长率在第1年都有较大幅度下降,双组分密封胶的下降幅度为35%,两种单组分密封胶的下降幅度约50%;后面4年在第1年基础上小幅波动。湿热气候环境下均无粘结破坏。

3 silicone based structural sealants were placed in Hainan tropical climate to test their tensile adhesion for weather aging test. A number of samples were taken out to measure their tensile adhesion properties every year over a period of 5 years. Result showed that after 5 year’s constant exposure in Hainan,the maximum tensile strength of the two parts alkoxy silicone sealant decreased 8% after the first year,and then increased in the following 4 years with a total of 14%; the maximum tensile strength of 1 part alkoxy silicone structural sealant varied in a small scope; the maximum tensile strength of 1 part acetoxy silicone structural sealant decreased 14%. The elongation at maximum tensile strength of 3 sealants were having big sharp fall,2parts and 1 part sealant were 35% and 50%,respectively. A small fluctuation was performed over the next 4years. All test samples showed there was no adhesion failure,which meant the wet tropical climate has no significant effect on the adhesion.