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Infinitely hot-bendable polyester protective film as well as preparation method and application thereof

A technology of protective film and polyester base film, which is applied in the direction of film/sheet-shaped adhesives and adhesives, which can solve the problems that the PET protective film cannot fully fit the edge of the 3D curved surface and is easy to warp, and achieve coating The cloth process is easy to control, good resistance to nail embossing, and the effect of less process

Active Publication Date: 2021-07-09
江西昊泽光学膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing PET protective film cannot fully adhere to the edge of the 3D curved surface and is easy to warp, and at the same time satisfy the fingerprint unlocking function under the screen, the present invention provides a non-extreme heat-bendable polyester protective film

Method used

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  • Infinitely hot-bendable polyester protective film as well as preparation method and application thereof
  • Infinitely hot-bendable polyester protective film as well as preparation method and application thereof
  • Infinitely hot-bendable polyester protective film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] First of all, the first step is to prepare the semi-finished polyester base film. The specific operation is: place the silicone oil release film on the first roll, and the release surface is sent to the coating head as the coating surface, with a thickness of 50 μm and a release force of 3gf; the second roll is placed in the low-viscosity silicone process. The film is used as process protection, with a thickness of 60 μm, and the viscosity of the silica gel is preferably 4 gf. The polyester solution formulation includes 25 parts of high Tg saturated polyester resin particles, 10 parts of medium Tg saturated polyester resin particles, 5 parts of low Tg saturated polyester resin particles, 8 parts of curing agent, 0.5 parts of leveling aid, 0.3 parts of UV absorber agent, 80 parts of ethyl acetate, 5 parts of cyclohexanone; the solid content of the solution is 33.7%, and the viscosity is 350cps / 25℃. The prepared polyester solution is pumped into the cavity of the slit coa...

Embodiment 2

[0077] Manufactured as in Example 1 in a three-step process. The difference between formula and process parameters is: in step one, the polyester solution formula includes 30 parts of high Tg saturated polyester resin particles, 5 parts of medium Tg saturated polyester resin particles, 10 parts of low Tg saturated polyester resin particles, 10 parts of curing agent , 0.6 parts of leveling aids, 0.3 parts of UV absorbers, 80 parts of ethyl acetate, 8 parts of cyclohexanone; the solid content of the solution is 35.6%, the viscosity is 400cps / 25°C; the pump speed is 30rpm, and the line speed is 5m / min to obtain polyester The base film thickness was 100 μm. In the second step, the mesh number of the gravure roll is 100 meshes, the line speed is 10 m / min, and the thickness of the hardened layer is 4 μm. In the third process, high-viscosity acrylic pressure-sensitive adhesive is selected, the glue supply pump speed is 18pm, the coating line speed is 9m / min, and the pressure-sensiti...

Embodiment 3

[0079] Manufactured as in Example 1 in a three-step process. The difference between formula and process parameters is: in step one, the polyester solution formula includes 30 parts of high Tg saturated polyester resin particles, 10 parts of medium Tg saturated polyester resin particles, 5 parts of low Tg saturated polyester resin particles, and 11 parts of curing agent , 0.6 parts of leveling aids, 0.3 parts of UV absorbers, 80 parts of ethyl acetate, 6 parts of cyclohexanone; the solid content of the solution is 33.9%, the viscosity is 490cps / 25°C; the pump speed is 28rpm, and the line speed is 3m / min to obtain polyester The base film thickness was 120 μm. In the second step, the mesh number of the gravure roll is 80 meshes, the line speed is 9 m / min, and the thickness of the hardened layer is 5 μm. In the third process, a high-viscosity silicone pressure-sensitive adhesive is selected, the glue supply pump speed is 21 pm, the coating line speed is 8 m / min, and the pressure-...

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Abstract

The invention relates to an infinitely hot-bendable polyester protective film as well as a preparation method and application thereof. The protective film comprises a surface protective film layer, a high-wear-resistance anti-fingerprint hardened layer, an infinite polyester base film, a high-viscosity pressure-sensitive adhesive layer and a release film layer which are sequentially attached. The polyester protective film disclosed by the invention is high in light transmittance and low in haze, does not affect an under-screen fingerprint unlocking function, has excellent AF water drop angle screen fitting property, is good in hot bending and shaping effect, and does not warp when being attached to the edge of a curved screen; the surface of the base film has high pencil hardness, wear resistance, scratch resistance, fingerprint resistance and high smoothness; the film is relatively good in wettability and exhaust property when being attached to the screen, and is not easy to leave fingernail imprint. The protective film has the advantages of simple structure, low requirements on polyester base film coating equipment, easiness in realization of process parameters, wide applicability, few production procedures and low cost.

Description

technical field [0001] The invention relates to a mobile phone screen protective film, in particular to a 3D hot bending protective film for unlocking a mobile phone screen with fingerprints under the screen. Background technique [0002] With the rapid upgrading of electronic products, the application of curved screens on mobile phones has gradually become popular, and mobile phone manufacturers are paying more and more attention to the problem of screen breakage caused by mobile phone drops. The traditional existing PET protective film can only be attached to the surface of the screen because of its hard material. The 2D screen can only be pasted, but the 3D curved screen with curved edges cannot be completely fitted. The surface of the curved screen has an AF high water drop angle coating, and the corner of the curved screen is prone to warping. In addition, the traditional extruded biaxially oriented PET film will lose luminous flux and affect the fingerprint unlocking f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/25C08J5/18C08J7/046C08L67/00
CPCC09J7/255C08J5/18C08J7/046C09J2467/006C09J2433/00C09J2483/00C08J2367/00C08J2467/00
Inventor 余正波程松波
Owner 江西昊泽光学膜科技有限公司
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