Optimization of platinum catalyzed liquid silicone rubber conductive foam by orthogonal experiment
Liquid silicone rubber(LSR)not only has the advantages of silicone rubber,but also has good fluidity and is easy to process.However,its insulation properties limit its application in the electronic field.At present,there have been many studies on conductive solid silicone rubber,but there is relatively less research on conductive LSR,and there are still some common problems,such as excessive conductive fillers,high hardness,and high density.In order to reduce the amount of conductive filler,also reduce its density and hardness,acetylene carbon black(CB)was used as the conductive filler and the material was foamed to prepare conductive LSR foam.However,platinum catalyzed LSR cannot use conventional nitrogen-containing organic foaming agents to avoid platinum poisoning,so other foaming methods need to be used.Hydroxy silicone oil(Si-OH)and water were used as chemical and physical foaming agents,and montmorillonite(MMT)as a reinforcing agent.In order to obtain a silicone rubber conductive foam with good comprehensive performance,the orthogonal experimental method was used and one-way analysis of variance was conducted to study the effects of hydroxy silicone oil,CB,MMT and water on foaming,mechanical properties,and electrical conductivity of the material.The results show that the orthogonal experimental method can quickly obtain the optimal ratio of CB/LSR conductive foam:when LSR content is 56.1 wt%,Si-OH is 28.1 wt%,CB is 7 wt%,MMT is 5.3 wt%,water is 3.5 wt%,the electrical conductivity of the prepared foam material is 3.36×10-6 S/m,which is 9 orders of magnitude higher than pure LSR,with density of 0.67g/cm3,43%decrease compared to pure LSR,Shore C hardness of 36,and 33%decrease compared to pure LSR.
liquid silicone rubberelectrical conductivityfoamingorthogonalcarbon black
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