Polyurethane glue for protective film

Abstract

The invention discloses polyurethane glue for a protective film. The polyurethane glue is prepared by mixing 30%-60% by weight of a main agent with 30%-60% by weight of a dissolving agent and then adding 5%-20% by weight of a curing agent into the mixture. The glue has the good adhesiveness, good air exhaustion property and excellent weather resistance on plastic thin film substrates such as PET, PE and PC and can significantly improve the product quality of the protective film.

Description

technical field [0001] The invention relates to the field of glue for protective films, in particular to a polyurethane (PU) glue for protective films. Background technique [0002] During the handling or production and use of electronic and electrical products, the surface is extremely susceptible to contact pollution or scratches. It is necessary to use a protective film to cover the surface to prevent it from being polluted or damaged. In order to reduce the generation rate of bubbles and reduce the difficulty of film sticking, the requirements for the exhaust performance of the protective film itself are getting higher and higher. [0003] There are three main types of glue used for protective films on the market: (1) Silica gel. The glue used in the protective film is silica gel, which has excellent exhaust performance and weather resistance, but when it is attached to the glass surface, there will be silicon residue after a long time, which will pollute the protected ...

AI Technical Summary

Problems solved by technology

However, since the application of polyurethane protective films is still in its infancy, most of the polyurethane protective films on the market will have a certain amount of glue residue after covering the surface of the protected object for a long time.

Although this part of the residual glue can be cleaned with cleaning agent, it has lost its original protective meaning

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