Preparation And Properties Of The Thermal Conductive Rubber

Particulate silicon carbide filler, lamellar expanded graphite filler and fibrouscarbon fiber filler are selected respectively as the single filler in the experimentalstudy of the thermal natural rubber composites. The mixture of the three differentmorphology fillers are selected as mixed fillers to study the effects of the properties ofthermal rubber at the same time.The results showed that the thermal conductivity of natural rubber compositeswith lamellar expanded graphite filler was the best, natural rubber composites withparticulate silicon carbide filler was the second, natural rubber composites withfibrous carbon fiber filler was the worst. When the content of the expanded graphitefiller was50parts, the thermal conductivity of rubber composite was0.3881W/m K.The surface modification of carbon fiber can improve the tensile strength and thermalconductivity of the composites. When the filling amount of the modified carbon fiberswas50parts, the tensile strength of the composite material reached25.64MPa,thermal conductivity reached0.3746W/m K.Silicon carbide has poor combination with natural rubber, so we use black carbonas a particulate conductive filler. We combine lamellar expanded graphite and fibrouscarbon fiber as mixed fillers. The thermal conductivity of natural rubber compositeswith mixed fillers (the mass ratio of expanded graphite and carbon fiber is1:1) wasmuch better than that of natural rubber composites with pure filler. When the contentof mixed fillers was50parts, the thermal conductivity of the rubber compositesreached0.4137W/m K, which improved78%than pure natural rubber. When thecontent of mixed fillers with surface modified was50parts, the thermal conductivityof the rubber composites reached the largest, that was0.4137W/m K, the tensilestrength was20.79MPa, tear strength was25.74KN/m. When the thermal rubber composites were prepared with surface modified mixed filler and when the content ofsurface modified mixed filler was50parts, the thermal and mechanical properties ofrubber composites were the best.