Study on the influencing factors of natural degradation of liquid silicone rubber used for external insulation

Chen Can, Yifeng Lin, Zhidong Jia, Li Tong, L. Hai, Wang Xilin
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引用次数: 7

Abstract

In recent years, liquid silicone rubber (LSR) has been widely used in the external insulation field. However, further study on the degradation mechanism and the influencing factors of liquid silicone rubber is still required. Especially when it is used in southern parts of China, of which the high temperature and humidity environment could accelerate the degradation process. It is reported that cracking and chalking phenomena were observed on the liquid silicone rubber sheath of PT and CT. In this paper, a series of ageing experiments were designed and carried out to test the performance of liquid silicone rubber when exposed to factors such as high temperature, high humidity, sun exposure and corona discharge. After the experiments, characteristics such as hardness, hydrophobicity, glossiness and mechanical properties were tested and SEM was used to study the change of micro structure. It is concluded that high temperature, high humidity and sun exposure play significant roles in the degradation of liquid silicone rubber, which could lead to the rise of hardness, loss of hydrophobicity, decrease of glossiness and surface cracking. The results also show that the change of mechanical properties of liquid silicone rubber were tiny.
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外保温用液态硅橡胶自然降解的影响因素研究
近年来,液体硅橡胶(LSR)在外保温领域得到了广泛的应用。但对液态硅橡胶的降解机理及影响因素仍需进一步研究。特别是在中国南方地区使用时,高温高湿环境会加速降解过程。据报道,在PT和CT的液态硅橡胶护套上观察到开裂和白垩现象。本文设计并开展了一系列老化实验,测试了液体硅橡胶在高温、高湿、日晒和电晕放电等因素下的性能。实验结束后,对其硬度、疏水性、光泽度、力学性能等进行了测试,并利用扫描电镜研究了微观结构的变化。结果表明,高温、高湿和日晒对液态硅橡胶的降解有重要影响,导致硅橡胶硬度升高、疏水性丧失、光泽度下降和表面开裂。结果还表明,液体硅橡胶的力学性能变化很小。
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