Heat-conducting grease composition free of oligosiloxane volatilization and preparation method of heat-conducting grease composition

Abstract

The invention provides a heat-conducting grease composition free of oligosiloxane volatilization. The heat-conducting grease composition is prepared from the following components in parts by weight: 350-550 parts of a heat-conducting filler modifier, 100-200 silicon-free heat-conducting oil, 80-100 a nanoscale second dispersant and 10-30 a high-temperature resistance assistant, wherein a heat-conducting filler is prepared from a carbon nano tube, boron nitride and a particulate matter at the weight ratio of (5-15):(0.5-1):(35-45). The heat-conducting grease composition belongs to the technical field of thermal interfacial materials. The heat-conducting grease composition is good in stability, no oligosiloxane volatilizes in use, and the heat-conducting grease composition has ultra-low contact thermal resistance characteristics and good electric insulation property and dielectric property, is stable in room-temperature storage, free of oil leakage and good in weather resistance, and does not become dry and hard even if used below 180 DEG C for a long period of time.

Description

technical field [0001] The invention belongs to the technical field of thermal interface materials, and in particular relates to a thermally conductive grease composition without volatilization of oligomeric siloxane and a preparation method thereof. Background technique [0002] With the improvement of integration and power density of electronic components, the heating of components has also increased significantly. Thermal interface materials are widely used because they can effectively reduce the interface thermal resistance between heat sources and heat sinks. Thermally conductive silicone grease composition is one of the most commonly used thermally conductive media. It is a material used to fill the gap between the heat source and the heat sink, and conducts the heat emitted by the heat source to the heat sink, so that the temperature of the heat source can be maintained at a stable temperature. The level of work can extend the service life of the device and prevent th...

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Problems solved by technology

[0006] The disadvantages of existing thermal conductive silicone grease include: (1) methyl silicone oil tends to migrate slowly during long-term use, and the migrated methyl silicone oil has potential adverse effects on some electronic components, especially for optical screens, it will It leads to increased haze, which affects the use; (2) only pays attention to the improvement of thermal conductivity, but does not consider that thermal resistance is also a key factor affecting the application performance of thermal conductive silicone grease, such as: the thermal conductivity is as high as 5.0W / (m·K), But its contact thermal resistance is as high as 0.4K cm 2 / W, resulting in poor heat transfer effect; (3) Poor reliability, it will dry and harden after 2-3 years of use above 80 ° C, thus losing the effect of interface heat conduction; (4) There is a certain amount of siloxane volatilization , although silicon-containing base oil has good thermal conductivity and service temperature range, there is a problem of siloxane volatilization

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