Heat-conducting silicone grease and preparation method thereof

Abstract

The invention provides heat-conducting silicone grease and a preparation method thereof. The heat-conducting silicone grease is prepared from the following components in parts by mass: 100 parts of polydimethylsiloxane, 5-20 parts of modified silicone oil, 1300-1800 parts of modified heat-conducting composite powder and 2-10 parts of a thermal gel additive. Through grading of spherical aluminum oxide with different particle sizes and by utilizing the characteristics of strong surface effect and small-size effect of nano quantum dots, cavity gaps dispersed among aluminum oxide particles are uniformly filled, so that the thermal resistance of the product is effectively reduced, the thixotropic index of the heat-conducting silicone grease is improved, and the heat-conducting silicone grease is endowed with a shear thinning characteristic; and meanwhile, the heat-conducting silicone grease has enough binding power, and the aging property of the heat-conducting silicone grease is improved.Meanwhile, the particle size distribution of the filler is strictly controlled, and the selected filler is very narrow in particle size distribution and has good monodispersity; the filler with the particle size larger than 20 microns is screened out through sieving processing, so that it is ensured that the filler grading effect is good, and gaps are avoided; and the heat-conducting silicone grease is low in thermal resistance value and excellent in aging performance.

Description

technical field

[0001] The application relates to the field of thermally conductive materials, in particular to a thermally conductive silicone grease and a preparation method thereof. Background technique

[0002] At present, there are many types of thermal conductive silicone grease on the market. Different physical characteristics and parameters determine different uses. For example, some are suitable for heat conduction of central processing units, some are suitable for heat conduction of power supplies, and some are suitable for heat conduction of memory sticks, etc. Due to different working conditions, different requirements are put forward for the performance of thermal conductive silicone grease. As thermal conductive silicone grease is used more and more widely, more requirements are put forward for its characteristics. Generally, thermally conductive silicone grease with thixotropy has better scraping property during use, no sag phenomenon, is conducive to glue coa...

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