Liquid metal heat-conduction filling material-containing polyethylene terephthalate heat-conduction film

Abstract

The invention provides a PET (polyethylene terephthalate) heat-conduction film, which comprises a PET bearing membrane and an adhesive material layer attached on the surface of the PET bearing membrane. The adhesive material layer comprises the following raw materials by weight: 10-50 parts of a liquid metal heat-conduction filling material, 2-10 parts of micro wax powder, 20-30 parts of spherical graphite, 1-10 parts of a membrane-forming auxiliary agent, 0.5-3 parts of a cosolvent, 0.5-3 parts of a dispersant, 0.1-0.5 parts of an antifoaming agent, 0.1-2 parts of a thickening agent, 0.1-2 parts of a levelling agent, 20-40 parts of a silicone acrylic emulsion, and 0-5 parts of other auxiliary agents. The heat-conduction film has high heat conduction coefficient, and the adhesive material has stable long-term coating and stripping effects on the PET membrane.

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] PET double-sided adhesive tape or single-sided adhesive tape is made of PET double-sided or single-sided coated adhesive material containing heat dissipation medium. Various bonding applications in electronic products. [0003] Since PET double-sided tape or single-sided tape uses PET as a carrier, it is required that the adhesive material has a long-term stable coating and peeling effect on the PET film, and has good thermal conductivity. [0004] At present, the most studied is to use C materials such as graphite and carbon nanotubes as thermally conductive fillers, but the amount of C materials dispersed in the adhesive matrix is ​​limited, and the thermal conductivity is ...

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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