Flexible composite cover plate and manufacturing method thereof

Abstract

The invention discloses a flexible composite cover plate and a manufacturing method thereof. The flexible composite cover plate at least comprises ultra-thin glass and a transparent polyimide layer formed on the ultra-thin glass, and the transparent polyimide layer is formed by conducting composite imidization treatment on a transparent polyamide acid layer smeared on the ultra-thin glass, whereinthe composite imidization treatment comprises low-temperature thermal imidization treatment and chemical imidization treatment which are carried out in sequence. The technological process is free ofa high-temperature manufacturing procedure, energy consumption is effectively reduced, the technological applicability is high, part of the imidization process is carried out in a solution, and particle pollution can be effectively avoided; the cross-cut tester adhesive force of each film layer is as high as 5B, the surface hardness is greater than 5H, and the bending resistance and the impact resistance are relatively strong; and besides, the invention further discloses a structure of the flexible composite cover plate with a black ink pattern layer and a preparation method of the flexible composite cover plate, that is, the black ink pattern is printed on the surface of the transparent polyimide layer, so that the risk that the printing screen plate is in direct contact with the ultrathin glass to scratch the ultrathin glass is eliminated.

Description

technical field [0001] The present invention relates to the technical field of flexible display terminal accessories, and more specifically, relates to a flexible composite cover formed by compounding ultra-thin glass and transparent polyimide and a manufacturing method thereof. Background technique [0002] As the interactive interface of the flexible display terminal, the flexible cover must not only provide the necessary protection for the display terminal, but also have the characteristics of high visible light transmittance, comfortable hand feeling, high surface hardness and strong bending resistance. The current technology development mainly focuses on transparent polyimide (CPI) film and ultra-thin glass (UTG<100um), but a single technology cannot meet people's requirements for flexible covers, so UTG / CPI composite covers The board has become the current compromise choice. [0003] According to the preparation technical characteristics of UTG / CPI composite cover ...

AI Technical Summary

Problems solved by technology

The current technology development mainly focuses on transparent polyimide (CPI) film and ultra-thin glass (UTG<100um), but a single technology cannot meet people's requirements for flexible covers, so UTG / CPI composite covers board becomes the current compromise choice

[0003] According to the preparation technical characteristics of UTG / CPI composite cover plate, it can be roughly divided into film-coating type and coating type. Among them, the film-covering type uses optically clear adhesive (OCA) as a binder to attach the CPI film to the surface of UTG. The preparation method has the advantages of simple process and low equipment cost, but the defects are also obvious, such as the high cost of incoming materials for CPI film, and the thickness of the product is limited by the thickness of incoming materials and complex structure; while the coating method is based on the precursor of CPI The material is transparent polyamic acid (CPAA) solution as raw material, coated on the surface of UTG and imidized to obtain CPI film, which has the advantages of good adhesion, bending resistance, flexible design of film thickness according to product requirements and thinner overall thickness of the product. However, the disadvantages are high equipment cost and complex process. The biggest problem is that the process temperature of CPAA imidization often needs to be higher than 300°C, and this temperature is unbearable for the adhesive that provides the necessary support for UTG during the process. of

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