Anti-fingerprint TPU protective film for 3D curved screen and preparation method of anti-fingerprint TPU protective film

Abstract

The invention discloses an anti-fingerprint TPU protective film for a 3D curved screen. The protective film comprises a low-viscosity protective film, an anti-fingerprint UV hardening coating, an optical hard TPU resin film layer, an optical-grade high-viscosity silica gel pressure-sensitive adhesive layer and a fluorine element release film which are attached from top to bottom; the anti-fingerprint UV hardening coating is formed by coating an anti-fingerprint UV hardening coating; the optical hard TPU resin film layer is formed by coating optical hard TPU glue, the optical-grade high-viscosity silica gel pressure-sensitive adhesive layer is formed by coating an optical-grade high-viscosity silica gel pressure-sensitive adhesive; the anti-fingerprint UV hardening coating is prepared fromthe following components: UV prepolymer resin, an acrylate reactive diluent, a photoinitiator, a slipping aid and a first solvent, the optical-grade hard TPU glue is formed by polymerizing polyisocyanate, polyester polyol and a chain extender in a second solvent under the action of a first catalyst; the optical-grade high-viscosity silica gel pressure-sensitive adhesive is composed of silica gel resin, a cross-linking agent, an anchoring agent and a second catalyst. The anti-fingerprint TPU protective film for a 3D curved screen has the properties of fingerprint resistance, scratch resistance,difficulty in bursting and good fitting property of the curved screen.

Description

technical field [0001] The invention relates to the technical field of screen protective films, in particular to a 3D curved screen anti-fingerprint TPU protective film and a preparation method thereof. Background technique [0002] Existing smartphones have entered the era of curved screens and folding screens from straight touch screens. Touch screens have stricter requirements on the screen's anti-breakage and scratch resistance. Higher requirements have also been raised. [0003] The curvature of the 3D curved screen is getting bigger and bigger, and the traditional PET, PC, TAC, PMMA base film and composite film with TPU cannot be well attached to the 3D curved screen. Only a pure TPU film can bend arbitrarily on a curved screen without bursting. At present, most of the TPU films on the market are made by casting method. The TPU films formed by this method are lacking in flatness and light transmittance, and the softness and hardness of the TPU films are difficult to ...

AI Technical Summary

Problems solved by technology

[0003] The curvature of the 3D curved screen is getting larger and larger, and the traditional PET, PC, TAC, PMMA base film and composite film with TPU cannot be well attached to the 3D curved screen.

At present, most of the TPU films on the market are made by the casting method. The TPU films formed by this method are lacking in flatness and light transmittance, and the softness and hardness of the TPU films are difficult to match.

For example, the screen protector mentioned in the patent CN110202901A uses a commercially available TPU base film, while the mobile phone protective film mentioned in the patent CN110484156A is made of TPU film and PET film made by melt coating method through OCA glue. , complex process

[0004] Moreover, the existing mobile phone protective film puts forward higher requirements on the smoothness, scratch resistance, wear resistance, and anti-fingerprint of the surface. Flat screens generally use UV curing coatings to harden the surface of the protective film, but ordinary UV Cured coatings tend to burst when bent

[0005] Furthermore, the surface of the 3D curved screen is generally treated with anti-fingerprint treatment, and the water contact angle reaches 110-120°. The surface energy of the 3D curved screen after anti-fingerprint treatment is low. Pressure-sensitive adhesives have relatively low adhesive force, and it is difficult to stick them firmly to the screen. After being attached to the mobile phone screen, the curved surface is prone to rebound and warp

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