Low-viscosity heat conducting silicone grease and preparation method thereof

Abstract

The invention discloses low-viscosity heat conducting silicone grease. Composition of the low-viscosity heat conducting silicone grease comprises components of dimethyl silicone oil, heat conducting powder of class I, heat conducting powder of class II, a coupling agent and an auxiliary. A preparation method of the low-viscosity heat conducting silicone grease comprises steps as follows: step 1, the dimethyl silicone oil, the coupling agent and the auxiliary are added to a double-planet stirring machine to be mixed uniformly; step 2, the heat conducting powder of class II is added to a mixed liquid obtained in the step 1 and mixed uniformly; step 3, the heat conducting powder of the class I is added to a mixed liquid obtained in the step 2 and mixed uniformly; step 4, a mixed liquid obtained in the step 3 is sufficiently stirred and subjected to vacuum pumping and defoaming. The heat conducting silicone grease produced with the method has the characteristics of low viscosity, high heat conduction coefficient, low probability of sedimentation, low permeability, good long-term stability and the like.

Description

technical field [0001] The invention relates to a thermal interface material for electronic components, in particular to a low-viscosity heat-conducting silicone grease and a preparation method thereof. Background technique [0002] Thermally conductive silicone grease, also known as heat dissipation paste, is a paste heat dissipation material containing silicone oil. Due to the limitations of the manufacturing process and clamping method, there is always a small gap between the components and the heat sink, and the gap is filled with air, and air is a poor conductor of heat. The thermal conductivity of air is very low, which seriously affects the electronic components. the overall cooling effect. Filling the thermal conductive silicone grease in the gap between the components and the heat sink can ensure the close contact between the components and the heat sink, increase the contact area, improve the heat transfer efficiency, and quickly and evenly spread the heat generat...

AI Technical Summary

Problems solved by technology

The thermally conductive silicone grease obtained by this method is a thermally conductive silicone grease product with high thermal conductivity, insulation and low contact thermal resistance. Adding a coupling agent can reduce the viscosity of the system, but the viscosity of the thermally conductive silicone grease obtained after mixing is close to 350,000 centipoise, the viscosity is still very high, and the surface wettability of thermal conductive silicone grease is poor, resulting in an increase in interface thermal resistance and poor overall thermal conductivity, which is not conducive to heat dissipation between electronic devices

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