Low tearing voltage polyurethane protective film and preparation method thereof

By adding antistatic agents and plasticizers to the polyurethane pressure-sensitive adhesive layer of the protective film, combined with moderate surface impedance, the problem of excessive tearing voltage and excessive adsorption during tearing is solved, and the balance between low tearing voltage and moderate adsorption force is achieved, and the production efficiency is improved.

CN119775946APending Publication Date: 2025-04-08TAIXING LIANCHUANG INSULATION MATERIAL CO LTD
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Patent Information

Application Number
CN202411880731.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-04-08

AI Technical Summary

Technical Problem

In the prior art, the tearing voltage of the protective film when tearing off is too high, which easily breaks down and damages the screen module, and the adsorption of the protective film is too strong, resulting in a decrease in production efficiency.

Method used

A low tear film voltage polyurethane protective film is adopted, including the back anti-static coating, the main substrate layer, the rubber anti-static coating, the polyurethane pressure-sensitive adhesive layer and the release layer. By adding anti-static agents and plasticizers to the polyurethane pressure-sensitive adhesive layer, combined with a moderate surface impedance, the tear film voltage is reduced.

Benefits of technology

It effectively reduces the film tearing voltage, reduces breakdown damage to electronic components by static electricity, and maintains a moderate initial adsorption force, avoids the problem of excessive peeling force after high temperature and high humidity, and improves production efficiency.

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Abstract

The present invention provides a polyurethane protective film with low film tearing voltage, comprising a back antistatic coating, a main substrate layer, an adhesive surface antistatic coating, a polyurethane pressure-sensitive adhesive layer, and a release layer. The polyurethane pressure-sensitive adhesive layer comprises, by weight, a polyurethane prepolymer, a curing agent, a catalyst, a plasticizer, an antistatic agent, and an organic solvent. The polyurethane protective film provided by the present invention has moderate initial adsorption force on the electronic touch screen, and after high temperature and high humidity, the protective film has a small increase in peeling force on the touch screen, low precipitation, and can effectively protect the touch screen. In addition, the present invention adds a plasticizer and an antistatic agent, which significantly increases the conductivity of the polyurethane pressure-sensitive adhesive layer, so that the film tearing voltage of the polyurethane protective film on the touch screen reaches a lower range, which can effectively reduce the breakdown damage of the static electricity generated during the film tearing process to the electronic components.
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