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Using atmospheric pressure plasma jet to clean the glass panel of mobile phone to remove grease

Keywords:

to,the,and,of,plasma,in,glass,surface,are

Published on:

28 Apr,2021

Using atmospheric pressure plasma jet to clean the glass panel of mobile phone to remove grease

In recent years, mobile phones are glass panels, in order to improve the strength and hardness of glass panels, usually using chemical toughening. And need to be cleaned before chemical tempering, if the cleaning is poor, it will affect the quality of the product.

The traditional cleaning method is to scrub with detergent first, and then use acid and alkaline solution and organic solvent ultrasonic cleaning. The process is complicated, time-consuming and costly, and causes pollution. And now there are low-temperature plasma treatments. The ions, electrons, excited atoms, molecules and free radicals enriched in low temperature plasma are all active particles, which are easy to react with the surface of the material. Therefore, it is widely used in surface modification, thin film deposition, etching processing, device cleaning and other fields. Atmospheric pressure plasma jet cleaning mobile phone glass panel

Plasma surface

Atmospheric cryogenic plasma jet is a newly developed plasma treatment technology in recent years. It has the advantages of low breakdown voltage, high ion and metastable molecular concentration, high electron temperature, low neutral molecular temperature, uniform plasma, good controllability, no need to vacuum, and continuous surface cleaning.

When cleaning, the higher the concentration of chemical active components in the plasma, the better the cleaning effect. In addition to the mechanical action, the cleaning of the glass surface by plasma jet is mainly the chemical action of reactive oxygen species. The Ar* in the excited state in the plasma,

Excite oxygen molecules into excited oxygen atoms

Ar * + O2 - > O + O * + Ar (1)

Ar * + O - > O + Ar (2)

High-energy electrons collide with oxygen molecules and break them apart, forming excited oxygen atoms

E + O2 - > * O + O + e (3)

E + O2 - > O + O + e (4)

The main components of stained lubricating oil and stearic acid are hydrocarbons, which are oxidized by reactive oxygen species to produce carbon dioxide and water

CnHm + PO *→ XCO2 + YH2O (5)

This removes grease from the surface of the glass.

Lubricating oil and stearic acid are common contaminants on the glass surface plate of mobile phones. After contamination, the contact Angle of the glass surface to water increases, affecting ion exchange. The traditional cleaning method has complicated process and pollution.

Atmospheric plasma generator, simple structure, do not need to vacuum, can be cleaned at room temperature, the generated excited state of oxygen atoms than the general oxygen atoms are more active, can be polluted lubricating oil and stearic acid in the oxidation of hydrocarbons, carbon dioxide and water.

At the same time, the plasma jet also has mechanical impact, which plays a scrubbing role and makes the contaminants on the glass surface quickly escape from the glass surface, so as to achieve the purpose of efficient cleaning.

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