| By filling a certain amount of conductive particles (metal particles, conductive iron, conductive carbon black) into polymer can develop new conductive composite material with piezoresistive characteristics. Studying the stability of the composite pressure-sensitive materials has important practical significance for further practical application of touch sensors.This paper rearchs on the stability of based on carbon black filled sillcone rubber material. The present situation and progress of flexible tactile sensor, composite conductive rubber and its conductive mechanism at home and abroad are first elaborated.On the basis of analysis of pressure-sensitive conductive rubber conductive mechanism and piezoresisitive model, focus is exploring the effect of factors such as the selection, proportioning of various kinds of raw materials(such as the matrix rubber, carbon black) and process, etc. on the performances of conductivity, piezoresistance and relaxation effect on the room temperature,and temperature(30℃～90℃) stability. Search the reasons related with the properties of carbon black/silicone rubber. Using scanning electron microscopy to observe and analyse the internal micro-structure of pressure-sensitive conductive rubber which is made of different types of carbon black, the same kind of carbon black with different added content, with and without nano materials,combined with theoretical,analyse the factors influncing the stability of pressure-sensitive conductive rubber.The results show that the structural properties of carbon black and the dispersion state of carbon black in silicon rubber have great influnce on the stability of conductive rubber, and selecting the amount of structure and control of agents and nano SiO2, Al2O3, can promote the carbon black dispersion in silicone rubber to improve the stability of composite pressure sensitive conductive rubber.
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