Phase-change heat-conducting silicone grease and preparation method thereof

Abstract

The invention provides phase-change heat-conducting silicone grease and a preparation method thereof. The phase-change heat-conducting silicone grease is prepared from organic silicone oil, phase-change capsules, heat-conducting filler and an assistant. The invention also provides the preparation method of the phase-change heat-conducting silicone grease. The preparation method comprises the following steps: preparation of modified heat-conducting filler, preparation of a raw-material mixture, vacuum stirring treatment and the like. The phase-change heat-conducting silicone grease prepared bythe method has the beneficial effects that the fluidity and the wettability are good, the service life is long, the compatibility between the heat-conducting filler and the silicone oil is good, the heat-storage function is achieved, the interfacial thermal contact resistance of nodes and a radiating device of a high-power electrical appliance can be effectively reduced, and the heat transfer canbe accelerated; the preparation process is simple, the cost performance is high, and the application is wide.

Description

technical field [0001] The invention belongs to the technical field of thermal interface materials, and in particular relates to a phase-change heat-conducting silicone grease and a preparation method thereof. Background technique [0002] With the development of science and technology, the density and miniaturization of integrated circuits are getting higher and higher, the operating speed of electronic components is increasing, and the power density is increasing. A large amount of heat will be released during work. If it cannot be conducted in time, It is easy to cause local high temperature, which will reduce the life of the device and even lose its efficacy, so it is very important for the heat dissipation of electronic devices. However, there are extremely fine uneven air gaps between the surface of the microelectronic material and the heat sink, and the thermal conductivity of the air is only 0.024W / (m K), which is a poor conductor of heat, which will lead to friction...

AI Technical Summary

Problems solved by technology

[0004] However, in order to pursue a single high thermal conductivity, most of the thermal conductive silicone greases on the market are usually prepared by filling a large amount of thermal conductive fillers in the base silicone oil and mechanically mixing them, which tends to make the viscosity of the silicone grease too high and affect the flow of the silicone grease performance, which ultimately affects the actual heat dissipation effect when it is used for packaging

However, the silicone grease prepared by filling the thermally conductive filler with low-viscosity matrix silicone oil has too much fluidity, and it is easy to flow, and it is easy to contaminate the circuit board and cause short circuits and other faults during use.

In addition, because the thermal conductivity filler in silicone grease has poor compatibility with silicone oil, during long-term use, after many cycles of cooling and heating, the phenomenon of separation of silicone oil and thermal conductivity filler often occurs, resulting in the drying and differentiation of the silicone grease coating. , fragmentation, poor thermal conductivity, etc.

At the same time, in the face of the instantaneous high-power heat generation of the heating device, the silicone grease conducts heat and dissipates heat in time, which will easily lead to rapid accumulation of heat and rise in temperature, which will affect the performance of electronic devices

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