Method for separating polarizing film of liquid crystal glass by microwave heating

Abstract

The present invention relates to a Method of separating high-molecular film from liquid crystal glass through microwave heating, In this method, when microwaves are applied at the time of an LCD glass panel, the microwave selectively acting on a conductor in the liquid crystal panel glass to produce a thermal reaction, so that a polymer film on the LCD glass panel (for example, a polarizing film) to reduce the degree of engagement of the liquid crystal glass panel, so that the polymer film is easy to be removed from the LCD glass panel.

Description

technical field [0001] The invention relates to a method for microwave heating to separate the polarizing film of liquid crystal glass, in particular to the method of using microwave heating to reduce the degree of bonding between the polarizing film and the liquid crystal glass panel and to facilitate removal from the liquid crystal glass panel. Background technique [0002] Liquid crystal display is the fastest growing and most commonly used display at present. With the gradual emergence of the obsolete trend, in order to avoid environmental hazards caused by waste liquid crystal glass, it is more important to recycle waste liquid crystal glass. [0003] An important step in the recycling of waste liquid crystal glass is to remove the polarizing film attached to the liquid crystal glass panel, such as polarizing film. The method of early treatment is to heat the waste liquid crystal glass to burn and remove the polarizing film. In addition to the slow heat transfer effect ...

AI Technical Summary

Problems solved by technology

The method of early treatment is to heat the waste liquid crystal glass to burn and remove the polarizing film. In addition to the slow heat transfer effect of the glass and the long processing time, the waste gas generated by the burning of the polarizing film also needs to be treated to avoid Pollution of the air, plus carbon residues are likely to remain on the glass surface, so the treatment cost is high

Furthermore, the polarizing film is generally made of PET, which is a high-value plastic, and it cannot be recycled and reused if it is directly burned and removed.

[0004] Among them, China Taiwan Invention Patent No. 527232 discloses a method for removing the polarizing film in the open literature of the waste liquid crystal display resource recycling device and method, which can solve the aforementioned problem of burning the polarizing film to generate waste gas. The glass of the display is precisely cut, the liquid crystal material is separated by ultrasonic vibration and soaked in alcohol solvent, and then incinerated, the remaining glass sheet with polarizing film is heated to 150°C, and the indium titanium oxide conductive glass substrate heated for a period of time is impregnated in After immersing the tank in temperature-insulated liquid nitrogen, the polarizing film below it will fall off; since the overall heating of the polarizing film will soften it, the viscosity attached to the glass will be higher, so the viscous substance on the polarizing film has not yet completely Drying and solidification, using the effect of rapid cooling after heating, the viscous substance of the polarizing film cannot be firmly bonded to the glass and is easy to peel off

However, the above method takes a long time to process, and the liquid crystal glass needs to be immersed in liquid nitrogen, and the required processing cost is also high.

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