Additional coating for transparent polyimide film, application method of additional coating and cover plate film

Abstract

The invention discloses an additional coating for a transparent polyimide film, the thickness of the additional coating is 0.3-1 mu m, and the additional coating is formed by coating a coating on a transparent polyimide substrate and curing the coating on the transparent polyimide substrate; the coating comprises the following components in parts by weight: 10-30 parts of hyperbranched polyurethane acrylic resin; 0.05 to 3 parts by weight of acrylic silsesquioxane; 0.5 to 2 parts by weight of a photoinitiator; and 65-90 parts by weight of an organic solvent. The invention also discloses a use method of the additional coating for the transparent polyimide film. The invention also discloses a cover plate film. The additional coating is arranged on the transparent polyimide film, so that the adhesive force between the polyimide film and the hardened layer is improved, the surface energy of the polyimide film is improved, the wettability of the hardened layer on the surface of the additional coating is excellent, and the dyne value of the surface is increased after the additional coating is arranged; when other coatings such as a hardened layer are arranged on the coating, poor wetting points are obviously reduced; the film surface hardness is improved; the tensile property, the optical property and the appearance of the film are not influenced.

Description

technical field [0001] The invention belongs to the technical field of flexible folding panels, and in particular relates to an additional coating for a transparent polyimide film, a use method thereof, and a cover film. Background technique [0002] In recent years, with the rise of folding screen electronic products, the demand for flexible folding panels has also increased. There are currently two technical routes, ultra-thin glass solutions and transparent polyimide hardened film solutions. Among them, the ultra-thin glass solution has high hardness and good stiffness, but it is easy to break and has low mass production yield; the transparent polyimide hardened film solution has high flexibility, high production efficiency and stable yield rate, but its hardness is not as good as glass, so the hardness is improved while maintaining flexibility. It is an urgent problem to be solved for transparent polyimide hardening film. [0003] The transparent polyimide film is a flu...

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Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, the present invention provides a coating on the polyimide film substrate to improve the overall hardness of the cover film without affecting the tensile properties, which overcomes the existing hardening layer in polyimide The problem of difficult wettability of coating on the film, an additional coating for transparent polyimide film and its use method with better environmental adaptability, and a cover film with the additional coating

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