Functional Application And Performance Research Of Carbon Material/Silicone Rubber Composite System

With its excellent performance,silicone rubber has been widely used in aerospace,petroleum,medical and automotive fields.With the development of science and technology and the expansion of silicone rubber application fields,and in order to meet the continuous improvement of the performance requirements of silicone rubber in various fields,its research is developing from a single performance to high performance and multifunctional direction.Therefore,this paper systematically carried out the performance research of the carbon material/silicone rubber composite system,using different preparation methods,and by discussing the effect mechanism of different types of carbon materials on the performance evolution of the composite system,to provide guidance for high-performance and multifunctional applications of silicone rubber.The thesis first focuses on the micron-scale flake graphite/fluorosilicone rubber composite system.By studying the dispersion state of the flake graphite in the composite material,the combination of the flake graphite and the matrix interface is analyzed,and the influence mechanism of micron-sized graphite particle size and dosage on the mechanical properties,thermal conductivity and heat resistance of the composite system was discussed.On this basis,based on two different types of nano-scale carbon materials MWCNTs and GNs,nano-scale carbon materials/fluorosilicone rubber composite materials were prepared.In order to effectively improve the problem of easy aggregation of MWCNTs and GNs in the matrix,ultrasonic and ionic liquid non-covalent modification treatment methods are used to obtain high-performance carbon materials/fluorosilicone rubber composite materials.The effect of ionic liquids on the vulcanization properties of composite materials was systematically studied.The combination of carbon materials treated with different modification methods and the matrix and the filler network of the composite system were compared.The influence rules of the structure and dispersion of MWCNTs and GNs on the thermal conductivity and thermal stability of composite materials are proved.Considering the excellent mechanical strength,high thermal conductivity and conductivity of MWCNTs and GNs,the paper further studied the effect of the synergistic effect of gns-mwcnts on the antistatic capability and thermal stability of the fluorosicone rubber composite system,so as to achieve the achievement of high-performance composite materials at low dosages of GNs-MWCNTs.The properties of carbon material/fluorosilicone rubber composites prepared by mechanical blending and solution blending were compared and analyzed.The effect of the preparation method on the dispersion of GNs-MWCNTs was studied to obtain fluorosilicone rubber composites with better overall performance.Based on the research of the carbon material/silicone rubber composite system,combining it with the cell structure can further improve its thermal insulation,earthquake resistance and other functions.In this paper,a series of MWCNTs/silicone rubber foam materials were prepared by controlling the vulcanization temperature,foaming agent H and carbon nanotube dosage during the foaming process by chemical foaming.First,the cell structure of foamed materials with different foaming conditions was studied,and then the influence of the introduction of MWCNTs on the cell morphology was analyzed.The mechanism of the influence of the cell structure and micro-morphology on the thermal stability and thermal insulation performance of the composite system is proved.