A two-component thermally conductive silica gel sheet containing liquid metal thermally conductive filler

Abstract

The invention provides a thermally conductive silica gel sheet, which has two components. Component A includes: 90-100 parts by weight of diolefin-terminated dimethylpolysiloxane; 30-40 parts by weight of dihydroxyalkyl-terminated Polysiloxane; 25‑35 parts by weight of a copolymer of dihydroxy-terminated dimethylsiloxane and methylvinylsiloxane; 2‑10 parts by weight of methylvinyl cyclic siloxane; 150‑ 250 parts by weight of thermally conductive filler; component B includes: 40-80 parts by weight of phenyl hydrogen-containing silicone oil; 0.5-5 parts by weight of methyl vinyl cyclic siloxane; 2-10 parts by weight of platinum catalyst; 5-30 parts by weight part tackifier; wherein, the thermally conductive filler is a mixed filler composed of liquid metal thermally conductive filler and silicon micropowder. The invention has high thermal conductivity and strength.

Description

technical field [0001] The invention relates to the technical field of heat-dissipating films, in particular to a PET heat-conducting film containing liquid metal heat-conducting fillers, which is used in the same way as ordinary PET double-sided or single-sided adhesives. Background technique [0002] Thermally conductive silicone sheet is the mainstream material used in the prior art to transfer heat between heating parts and cooling parts. It has good flexibility, electrical insulation, compressibility, and ductility, and can fully fill irregular components. Surface, eliminating air, increasing the contact area, spacing insulation, shock resistance, and sealing, is an ideal choice for heat transfer materials in electronic equipment. [0003] In the prior art, silicone thermally conductive materials are mostly single-component mixture materials obtained by using silicone as the base material, adding thermally conductive fillers, and supplemented with various additives, and...

AI Technical Summary

Problems solved by technology

[0006] At present, for the application technology of liquid metal as a heat-conducting material, one is to directly disperse the liquid metal in the polymer matrix, but because the van der Waals force between the liquid metal is very large, the droplets dispersed in the polymer matrix are relatively large, and The size uniformity is poor, and the bonding between the metal droplet and the polymer matrix is ​​poor, and the interface difference makes the thermal conductivity of the entire thermal conductivity material not increase but decrease; there is another method to try to use the solidified metal powder and process it Surface coating, and then disperse the coated metal powder in the polymer matrix as a thermally conductive material, but due to the low melting point of liquid metal, the operation of metal particles and coating needs to be carried out at low temperature, and the operating conditions are harsh And the coating effect is not ideal

In addition, the existing technical means are to disperse the liquid metal in the whole polymer matrix, and exist as a specific heat-conducting material (heat-conducting patch), and cannot exist as an independent heat-conducting filler, which greatly limits the liquid metal as a Breadth and depth of applications for thermally conductive materials

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