PET (Polyethylene Terephthalate) protection film for cover plate glass manufacturing procedure or delivery process and preparation method thereof

A cover glass, protective film technology, applied in the direction of pressure-sensitive film/sheet, film/sheet-like adhesive, adhesive type, etc. and other problems, to achieve stable surface resistance value, solve the effect of poor scratch resistance and small increase in peeling force

Active Publication Date: 2018-11-23
KUNSHAN BYE MACROMOLECULE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the PET protective film used in the cover glass process on the market is mainly divided into three categories according to the glue system, silicone series, acrylic series and polyurethane series. Silicone pressure-sensitive adhesive film has good air release and temperature resistance. However, white fog or ghosting is easy to appear after high temperature. Due to the low surface energy of silicone, the silicone protective film will also reduce the surface energy of the glass, which will affect the subsequent processing such as ink printing, OCA lamination, etc.; polyurethane and acrylic The pressure-sensitive adhesive protective film has the problem of a large increase in peeling force after high temperature, which is not conducive to the peeling of the robot. In addition, the polyurethane pressure-sensitive adhesive protective film has the problem of white fog after high temperature. Scratch resistance, die-cutting is easy to powder
The above three types of pressure-sensitive adhesive protective films all adopt solvent-based production and coating methods. The solid content of the coating liquid is only about 20%. When 80% of the organic solvent volatilizes, it will consume a lot of energy and generate a lot of VOC emissions. There is great environmental pressure in the production of products
For ordinary acrylic or polyurethane pressure-sensitive adhesive protective film, the silicone release film is used as the isolation film, and the silicon on the release film will transfer to the rubber surface. Transfer to the glass surface again to reduce the free energy of the glass surface, thus affecting its printability and the adhesion of OCA glue

Method used

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  • PET (Polyethylene Terephthalate) protection film for cover plate glass manufacturing procedure or delivery process and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 50 parts of polyurethane acrylate with 2 functionalities, molecular weight of 8000 and glass transition temperature of -50°C, 30 parts of isocylacrylate, 20 parts of caprolactone acrylate, 3 parts of trimethylol triacrylate, 2 One part of 1-hydroxycyclohexyl phenyl ketone, 0.5 part of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 0.5 part of lithium perchlorate were mixed and stirred evenly, and filtered to obtain solvent-free UV curing Low peeling antistatic pressure sensitive adhesive A.

[0026] Coat pressure-sensitive adhesive A on a 50um optical PET substrate with a coating thickness of 10um and UV energy of 150 mj / cm 2 After the conditions are cured, the 50um PET non-silicon release film is pasted, and the 180-degree peeling force of the obtained protective film is 5g / 25mm, and the surface resistance value is 10 9 Ω, the prepared protective film is pasted on a 5-inch cover glass, after aging at 150°C, there is no pollution and no residue, and the peeling fo...

Embodiment 2

[0028] Coat pressure-sensitive adhesive A on a 50um optical PET substrate with a coating thickness of 20um and UV energy of 300 mj / cm 2 After the conditions are cured, the 50um PET non-silicon release film is pasted, and the 180-degree peeling force of the obtained protective film is 8g / 25mm, and the surface resistance value is 10 9 Ω, the prepared protective film is attached to a 5-inch cover glass, after aging at 150°C, there is no pollution, no residue, and the peeling force after high temperature is 25g / 25mm.

Embodiment 3

[0030] 40 parts of 2-functionality, molecular weight of 5000, glass transition temperature of -40 ℃ polyurethane acrylate, 30 parts of octyl acrylate, 25 parts of ethoxylated ethyl ethacrylate, 5 parts of trimethylol triacrylate , 2 parts of 1-hydroxycyclohexyl phenyl ketone, 0.5 part of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and 0.5 part of lithium perchlorate were mixed and stirred evenly to obtain a solvent-free UV curing low Peel off the antistatic PSA B.

[0031] Coat the pressure-sensitive adhesive B on the 50um optical PET substrate, the coating thickness is 15um, and the UV energy is 300 mj / cm 2 After the conditions are cured, the 50um PET non-silicon release film is pasted, and the 180-degree peeling force of the obtained protective film is 3g / 25mm, and the surface resistance value is 10 8 Ω, the prepared protective film is attached to a 5-inch cover glass, after aging at 150°C, there is no pollution and no residue, and the peeling force after high temperat...

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Abstract

The invention discloses a PET (Polyethylene Terephthalate) protection film for a cover plate glass manufacturing procedure or a delivery process and a preparation method thereof. The PET protection film comprises an optical-grade PET substrate layer, a solvent-free UV-curing low-stripping-force antistatic pressure sensitive adhesive layer and a non-silicon release film layer; the preparation method of the PET protection film comprises the following steps: 1) preparing a solvent-free UV-curing low-stripping-force antistatic pressure sensitive adhesive; 2) coating the optical-grade PET substratelayer with the solvent-free UV-curing low-stripping-force antistatic pressure sensitive adhesive; 3) carrying out UV illumination curing and laminating a non-silicon release film. According to the PET protection film disclosed by the invention, the utilized UV-curing low-stripping-force antistatic pressure sensitive adhesive has extremely excellent cohesive strength and has relatively good instant adhering performance on cover plate glass. When the protection film is used for the cover plate glass manufacturing procedure or the delivery process, the stripping force is stable, no residual adhesive is formed and no pollution is caused; meanwhile, the protection film has relatively small influences on surface tension on a glass surface, and the secondary printing performance and OCA (OpticalClear Adhesive) adhesive adhering performance are not influenced.

Description

technical field [0001] The invention relates to the field of protective films, in particular to a PET protective film for cover glass manufacturing or shipping and a preparation method. Background technique [0002] Cover glass is an important part of smart devices such as mobile phones, tablets, and notebooks. It is developing in the direction of thinner and more multifunctional. The cover glass is not only a direct window for display, but also has certain functions. In order to give the cover glass more functionality, it usually requires special treatment on the front, such as anti-scratch, anti-glare, anti-fingerprint, etc. In order to prevent light leakage from the edge of the mobile phone, ink is also printed on the back. In the above process, in order to prevent the untreated part from being affected, it is necessary to protect the surface, so a large amount of PET protective film is required. The protective film for cover glass generally requires low peeling force, u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/38C09J7/25C09J175/14C09J11/06
CPCC09J11/06C09J175/14C09J2467/006C09J2475/00C09J7/25C09J7/38C08K5/5397
Inventor 喻四海施法宽刘宇
Owner KUNSHAN BYE MACROMOLECULE MATERIAL CO LTD
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