硅橡胶隔热复合材料的制备及性能

采用空心玻璃微珠（HGB）和膨胀蛭石（EVMT）作为隔热填料，分别与高温硫化硅橡胶（HTV）共混制备HGB/HTV和EVMT/HTV隔热复合材料，并考察了隔热填料的种类和用量对隔热复合材料的隔热性能和力学性能的影响。结果表明，随着HGB和EVMT用量的增加，隔热复合材料的导热性能明显下降。相比于HTV试样，当HGB与HTV的质量比为20/100，EVMT与HTV的质量比为10/100时，隔热复合材料的导热系数分别下降了20.44%和12.34%。HGB和EVMT均能提高HTV隔热复合材料的100%定伸应力和邵尔A硬度，降低其拉伸强度与扯断伸长率。当HGB与HTV的质量比为20/100，EVMT与HTV的质量比为10/100时，隔热复合材料的拉伸强度分别为10.51 MPa和11.59 MPa，邵尔A硬度分别为71.6和59.1。

Preparation and properties of silicone rubber thermal insulation composites

Hollow glass bead(HGB)/ high tempe-rature vulcanized silicone rubber(HTV) and expan-ded vermiculite(EVMT)/HTV thermal insulation composites were prepared using HGB and EVMT as thermal insulation fillers blended with HTV, respectively. The effects of type and amount of thermal insulation fillers on the thermal insulation and mechanical properties of thermal insulation composites were investigated. The results showed that with the increasing amount of HGB and EVMT, the thermal conductivity of the thermal insulation composite decreased obviously. Compared with HTV, when the mass ratio of HGB to HTV was 20/100 and the mass ratio of EVMT to HTV was 10/100, the thermal conductivity of the thermal insulation composites decreased by 20.44% and 12.34%, respectively. Both HGB and EVMT could improve the modulus at 100% and Shore A hardness of HTV thermal insulation composites, and reduce its tensile strength and elongation at break. When the mass ratio of HGB to HTV was 20/100, and the mass ratio of EVMT to HTV was 10/100, the tensile strength of the thermal insulation composite were 10.51 MPa and 11.59 MPa, and Shore A hardness were 71.6 and 59.1, respectively.