导热绝缘防沉降室温硫化硅橡胶的制备与性能研究

以α，ω-甲氧基封端聚二甲基硅氧烷为基体，三氧化二铝（Al₂O₃）为导热填料，氧化锌（ZnO）、纳米二氧化钛（TiO₂）、纳米二氧化硅（SiO₂）和纳米Al₂O₃为防沉降添加剂，制备单组分导热绝缘防沉降室温硫化硅橡胶，研究其防沉降、导热和绝缘性能。结果表明，当ZnO、纳米TiO₂、纳米SiO₂和纳米Al₂O₃单一添加且用量分别为8，0.8，0.8和0.5份，且Al₂O₃和防沉降添加剂总用量为75份时，硅橡胶的防沉降性能优良，热导率增大，且物理性能和绝缘性能变化很小。;The thermally conductive and electrical insulated 1-part RTV silicone rubber with good anti-sedimentation property was prepared by using ZnO，nano TiO₂，nano SiO₂ and nano Al₂O₃ as anti-settling agents.The original rubber was based on α，ω-alkyloxypolysiloxane as matrix material and Al₂O₃ as thermally conductive filler. The anti-sedimentation property，thermal conductivity and electrical insulating property of the obtained silicone rubber were investigated. The results showed that when a single anti-settling agent from ZnO，nano TiO₂，nano SiO₂ and nano Al₂O₃ was used and the addition levels for each of them were 8，0.8，0.8 and 0.5 phr, respectively，meanwhile the combined addition level of Al₂O₃ and anti-settling agent was 75 phr，the anti-sedimentation performance of silicone rubber was excellent，the thermal conductivity was improved，and the physical properties and insulating property changed little