Expanded polytetrafluoroethylene film of composite conducting layer and preparation method of expanded polytetrafluoroethylene film

Abstract

The invention relates to an expanded polytetrafluoroethylene film of a composite conducting layer and a preparation method of the expanded polytetrafluoroethylene film. The expanded polytetrafluoroethylene film of the composite conducting layer comprises an expanded polytetrafluoroethylene layer and a conducting layer, wherein the conductive layer is compounded on the surface of the expanded polytetrafluoroethylene layer through hot pressing. The preparation method comprises the steps of stretching the expanded polytetrafluoroethylene layer to obtain a base material, preparing conductive liquid, coating the surface of the base material with the conductive liquid, drying, and finally compounding the conductive liquid on the surface of the base material in a hot pressing manner to obtain the expanded polytetrafluoroethylene film of the composite conductive layer. Compounding is carried out in a hot pressing mode, the stability of the conducting layer can be ensured, and compared with a metal material, the expanded polytetrafluoroethylene is high in flexibility, good in die cutting performance and excellent in weather resistance.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to an expanded polytetrafluoroethylene film of a composite conductive layer and a preparation method thereof. Background technique [0002] With the rapid development of the 5G market, the demand for electromagnetic shielding and waterproof conductive materials in 5G equipment and related applications is increasing; at present, the materials that realize functions such as electromagnetic shielding are metal products, and their flexibility, die-cutting and cost are low. Higher; although composite materials with functions such as conduction and electromagnetic shielding have also appeared on the market, such as a kind of expanded polytetrafluoroethylene film coating with functions such as heat conduction, heat insulation, conduction and electromagnetic shielding disclosed in the prior art 201710722824.3 Layer composite material and its preparation method, such as a composite materia...

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Problems solved by technology

[0002] With the rapid development of the 5G market, the demand for electromagnetic shielding and waterproof conductive materials in 5G equipment and related applications is increasing; at present, the materials that realize functions such as electromagnetic shielding are metal products, and their flexibility, die-cutting and cost are low. Higher; although composite materials with functions such as conduction and electromagnetic shielding have also appeared on the market, such as a kind of expanded polytetrafluoroethylene film coating with functions such as heat conduction, heat insulation, conduction and electromagnetic shielding disclosed in the prior art 201710722824.3 Layer composite material and its preparation method, such as a composite material coated with graphene coating on the expanded polytetrafluoroethylene membrane surface disclosed in prior art 201710723531.7, its preparation method and its preparation device, the prior art is only The graphene coating is compounded on the surface of the expanded polytetrafluoroethylene film by rolling coating and drying. The disadvantage is that the graphene coating is easy to fall off and pollute other components.

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