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Ultra low film peeling voltage polyurethane protective film, and preparation method thereof

A polyurethane, membrane voltage technology, applied in the direction of polyurea/polyurethane adhesive, conductive adhesive, film/sheet release liner, etc., can solve the problem of unsatisfactory antistatic effect, easy precipitation of antistatic agent, film body High internal impedance, to prevent breakdown and damage, high cross-linking density, and avoid pollution

Inactive Publication Date: 2019-01-01
苏州大胜电材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problems mainly solved by the present invention are: 1. Only the surface layer of the existing antistatic protective film used for touch screen processing has antistatic effect, the internal impedance of the film body is still high, and the antistatic effect is not ideal; 2. Polyurethane protection The antistatic agent in the film is easy to precipitate and pollute the screen in a high-temperature and high-humidity environment

Method used

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  • Ultra low film peeling voltage polyurethane protective film, and preparation method thereof
  • Ultra low film peeling voltage polyurethane protective film, and preparation method thereof

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preparation example Construction

[0026] The preparation method of ultra-low tearing film voltage polyurethane protective film of the present invention, the method comprises the steps:

[0027] (1) Mix polyurethane, curing agent and antistatic agent in an organic solvent and stir evenly to prepare a polyurethane adhesive mixture;

[0028] (2) The polyurethane adhesive mixture obtained in step 1) of the corona surface coating of the internally added antistatic PET layer;

[0029] (3) The antistatic adhesive layer obtained in step (2) is combined with the PET antistatic release film layer, and aged at 60°C for 72 hours.

[0030] The performance evaluation method of the ultra-low tearing voltage polyurethane protective film of the present invention is as follows: under the condition that the temperature is 23°C and the humidity is 55%, the resistance value of the rubber surface is measured, and the voltage between the rubber surface and the release film at the moment the release film is torn off As well as the d...

Embodiment 1

[0032] Embodiment 1: The formula composition and content of the polyurethane antistatic adhesive layer of this embodiment are: polyurethane pressure-sensitive adhesive (70%) 100g, aliphatic HDI trimer isocyanate 7 g, tetrakis hydroxymethyl phosphorus sulfate 0.1 g , ethyl acetate 80g. The ultra-low tearing voltage polyurethane protective film of this embodiment includes an internally added antistatic PET layer with a thickness of 50 μm (the impedance of both sides is 10 10 Ohm), polyurethane antistatic adhesive layer (impedance of 10 9 ohm) and a PET antistatic release film layer with a thickness of 50 μm (antistatic resistance of silicone oil surface 10 9 ohm).

[0033] The preparation method of the ultra-low tearing voltage polyurethane protective film of the present embodiment comprises the following steps:

[0034] (1) Mix 100g of polyurethane pressure-sensitive adhesive with a solid content of 70%, 7g of aliphatic HDI trimer isocyanate curing agent, 3g of tetrakis hydr...

Embodiment 2

[0037] Embodiment 2: The formula composition and content of the polyurethane antistatic adhesive layer of this embodiment are: polyurethane pressure-sensitive adhesive (70%) 100g, aliphatic HDI trimer isocyanate 7 g, tetrakis hydroxymethyl phosphorus sulfate 1.5 g , ethyl acetate 80g. The setting method of each layer of the ultra-low tearing voltage polyurethane protective film of this embodiment is the same as that of Embodiment 1. The preparation method of the ultra-low tearing voltage polyurethane protective film of this embodiment is the same as that of Embodiment 1.

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Abstract

The invention discloses an ultra low film peeling voltage polyurethane protective film. The ultra low film peeling voltage polyurethane protective film, from top to bottom, comprises an internal adding type antistatic PET layer, a polyurethane antistatic adhesive layer, and a PET antistatic release film layer; the impedance of the surface and the impedance of the internal part of the internal adding type antistatic PET layer are the same; the polyurethane antistatic adhesive layer is composed of polyurethane, a curing agent, and an antistatic agent at a mass ratio of 70:5:0.1-70:12:4. Applications of the ultra low film peeling voltage polyurethane protective film is capable of preventing breakdown and destroy of touch screen inductors caused by excessive voltage generated in film peeling process. The internal structure of the polyurethane antistatic adhesive layer in the ultra low film peeling voltage polyurethane protective film is compact, so that it is convenient for dispersion of the antistatic agent molecules and release of static electricity, and antistatic agent precipitation is not caused at high temperature high humidity environment.

Description

technical field [0001] The invention relates to the technical field of protective films, in particular to an ultra-low tearing voltage polyurethane protective film and a preparation method thereof. Background technique [0002] Compared with acrylic protective film, polyurethane protective film has faster exhaust gas, and compared with silicone protective film, it has the characteristics of environmental protection. In recent years, polyurethane protective film has been used in touch screen manufacturing process and shipment. There is a touch module behind the TP glass of the display screen, and the sensitivity of the touch sensor of different manufacturers is different, and the static electricity of the tearing film is too large to break down the touch sensor. Therefore, terminal mobile phone manufacturers (such as Huawei) have put forward requirements for the tearing voltage of the protective film (most standards are <500V). However, the glass cover formulas of differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/25C09J7/40C09J9/02C09J175/04
CPCC09J7/25C09J7/401C09J9/02C09J175/04C09J2301/122C09J2301/314C09J2467/005C09J2467/006
Inventor 顾群
Owner 苏州大胜电材有限公司
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