Intumescent Flame Retardant Silicone Rubber Composites Applications

In this dissertation, the silicone rubber composite was prepared by using precipitated silica as reinforcing agents, calcium carbonate, titanium dioxide, zinc oxide as semirein-forcing agents and ATH/MPP mixture as intumescent flame retardants. The silicone rubber's intumescent flame retardance properties, mechanical properties, thermal decomposition properties were characterized by limited oxide index, electron pull machine, TGA, FTIR and so on. It was found that aluminum hydrate and melamine phosphate mixture will increase silicone rubber composite's flame retardancy,thermal stability and charred layer.Besides, the silicone rubber composite was prepared by using precipitated silica as reinforcing agents, calcium carbonate, titanium dioxide, zinc oxide as semireinforcing agents and ATH/EG mixture as intumescent flame retardants. The silicone rubber's flame retardant properties,mechanical properties, electrics properties,thermal decomposition properties were characterized by limited oxide index, electron pull machine, TGA, FTIR and so on. It was found that thermal stability, flame retardancy, acid fastness and resitance of alkali had improved, however oil resistance didn't any change.In the end, Expansive Graphite Oxide(EGO) was synthesized by the oxidation of expansive graphite via the modified Hummers approach, the oxygen content of EGO was controlled by changing the content of the oxidation agent. The oxygen content, the morp-hology and the structure of EGO were characterized by FITR, XRD, SEM, TEM, RAMAN, TGA, XPS. It was found that the interplanar space had increased with the content of oxidation agent and the structure of expansive graphite could be easily disordered even by partial oxidation. Furthermore, the silicone rubber composite was prepared by using EGO as flame retardant and composite's thermal decomposition mechanism was anlyzed by TGA. The functional groups' effect of composite and interfacial binding force were characterized by FTIR, XRD, SEM, the thermal decomposition kinetics was evaluated by freeman-carroll way. It was found that EGO could reduce silicone rubber composite's decomposition temperature in low temperature but can improve its decomposition temperature in middle or high temperature; the activation energy of EGO silicone rubber composite had great change with the content of EGO increased.