Electromagnetic wave shielding film and highly transparent strong electromagnetic wave shielding tape based on electromagnetic wave shielding film

Abstract

The invention discloses an electromagnetic wave shielding film and a highly transparent strong electromagnetic wave shielding tape based on the electromagnetic wave shielding film. The invention is characterized in that the electromagnetic wave shielding film is prepared by coating electromagnetic wave shielding slurry on a transparent substrate, while the strong electromagnetic wave shielding tape is prepared based on the electromagnetic wave shielding film, wherein the electromagnetic wave shielding slurry is prepared by mixing silver nanowires, PEDOT:PSS, graphene, water-based acrylic resins, waterborne polyurethane resins, a curing agent, a small molecule dispersant, a flatting agent, an antifoaming agent and water. The electromagnetic wave shielding tape disclosed by the invention can reach the visible light transmittance of 90% or higher and is high in shielding effectiveness and wide in frequency range.

Description

technical field [0001] The invention relates to electromagnetic wave shielding of electronic components used for display, in particular to an electromagnetic wave shielding film and an electromagnetic wave shielding adhesive tape based thereon. Background technique [0002] Electromagnetic wave shielding coatings have been developed since the 1930s, and alkyd resins, acrylic resins, polyvinyl chloride, and polystyrene resins are generally used as the main film-forming substances. In 1957, Japan began to produce silver-based and carbon-based electromagnetic shielding coatings. Among them, silver-based coatings are expensive to prepare because silver is used as the main shielding substance. In addition, some enterprises use carbon as the main shielding substance of electromagnetic shielding coatings, but due to the poor conductivity of carbon, the shielding effect is poor. At present, the electromagnetic wave shielding coating is mainly obtained by adding conductive particles...

AI Technical Summary

Problems solved by technology

[0003] The commonly used methods of shielding electromagnetic waves are mainly divided into two categories: one is to use conductive cloth as the base material to make electromagnetic shielding structures, and the conductive cloth used is expensive, low in conductivity, and low in shielding efficiency; The surface of the conductive cover layer is printed to form a layer of conductive ink (such as silver paste ink), and the conductive ink layer fills the opening in the cover layer, thereby electrically connecting to the ground wire of the conductive pattern, and the conductive ink needs to be heated and dried , the operation is complicated, and there are strict requirements on the shielded elements and the construction environment

For example, patent CN101185385A discloses a kind of electromagnetic wave shielding material, which adopts conductive paste of silver particles, adhesives and solvents to be screen-printed onto resin substrates and then heat-treated. In this method, silver particles are used as the main conductive substance. The light rate is poor, and it needs to be printed and then heated before use, so its use conditions are limited

[0004] In summary, there are still deficiencies in the transmittance and shielding effectiveness of the existing electromagnetic wave shielding coatings. How to use the high shielding effectiveness of silver-based materials while reducing production costs needs to be further improved. How to use electromagnetic waves more simply and effectively Shielding coatings need to be further explored

Images