Not long ago, the "hydrophobic oleophobic layer" suddenly became a special fire word. At the same time, when there is a hot discussion on the Internet, I believe that some people will be overwhelmed by this: What kind of ghost is the hydrophobic oleophobic layer? What is the use of this play? Is there any difference? Is the hydrophobic oleophobic layer in life? It's very common, but it's not noticed when you touch it.
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Interpretation of the hydrophobic oleophobic layer is a film on the screen
The hydrophobic oleophobic layer, which is white, is the protective layer that can separate water and grease, and the antifouling coating that we hear every day. It is a kind of thing, that is, AF (Anti Finger Print) anti-fingerprint coating. Oleophpbic coating, the smooth feel of the new mobile phone screen comes from the hydrophobic oleophobic layer.
AF material is a fluorine-containing paint with extremely low surface tension. It is generally called perfluoropolyether. Its main function is to adhere to the surface of the screen, which increases the hydrophobicity, oil discharge and anti-fouling properties of the screen. It is widely used in mobile phones. On the protective glass of flat panel, display, and SLR, we often have access to electronic products with screens. This hydrophobic oleophobic effect is the same as the drop of water on the lotus leaf.
Water droplets on the lotus leaf
AF materials are mainly divided into two types of liquid and target pills (similar to small pills), which are suitable for spraying and vacuum evaporation. After the glass is coated, and then cured by high temperature, the AF coating remains on the surface of the screen. In addition to anti-fouling, the AF coating also has the characteristics of high wear resistance and high light transmittance, and the cost is also extremely low. The cost of spraying the single piece is not higher than 6 cents, the cost of a single piece of vacuum evaporation is not higher than 2 yuan, and the AF coating with a slightly higher concentration remains untouched for 1 or 2 years.
Vacuum evaporation equipment
Of course, the hydrophobic oleophobic layer is not only used on glass, but also on stainless steel. At present, relevant coating liquids are available for sale, and are sprayed on various metal materials such as stainless steel plates to form a nanometer/micron ultra-thin anti-oil and anti-fingerprint self-cleaning coating, which can make the water super high. The surface tension (expressed as water repellency) forms a water droplet with a higher water contact angle, allowing the oil to shrink to a small oil droplet that is difficult to adhere to the metal surface. A small amount of residual oil can be easily wiped off with a towel or paper towel.
Hydrophobic oleophobic layer without water demonstration
What is the use of hydrophobic oleophobic layer in daily use?
It is said that the hydrophobic, oil-discharging and anti-fouling functions of the hydrophobic oleophobic layer are not intuitive enough. Let us give a simple explanation: due to the popularity of the 2.5D screen, many people will choose the ordinary mobile phone protective film, but the cheap mobile phone protection. There is no hydrophobic oleophobic layer on the membrane. This protective film is obviously sturdy and rough in sliding feel. When we play the phone for a long time, there will be a lot of fingerprint stains on the protective film, and it will not be easy to wipe clean, and will further increase the sliding resistance.
Similarly, there is no reason for the hydrophobic oleophobic layer on the screen glass of the mobile phone. Without the hydrophobic oleophobic layer, there will be a relatively obvious sense of sliding resistance, and it is easy to leave fingerprint stains and is not easy to wipe. The panel glass with the hydrophobic oleophobic layer has a much reduced resistance on the touch slide, and although the fingerprint remains, it is easier to wipe.
How to identify if there is a hydrophobic oleophobic layer on the screen of the phone
The more professional identification method is to test the surface characteristics of the glass lens by the water droplet contact angle tester, and indirectly analyze the hydrophobicity of the glass surface from the angle of the water droplet to judge the anti-fouling force of the surface of the product.
The water drop angle is defined as the angle between the gas-liquid phase interface and the solid-liquid phase interface at the solid, liquid, and gas three-phase interface. The water drop angle is a measure of the solid surface humidity, using most of the solid droplets. The measurement was carried out, and the low contact water drop angle indicates that the surface having high humidity (hydrophilic) is easily pasted. The contact angle of high water droplets indicates that the surface shows hydrophobicity, the surface is heavily contaminated or the surface adhesion is poor.
Water droplet contact angle
Of course, our ordinary judgment does not need to be so professional. The water droplets are placed on the screen of the mobile phone. If the contact water droplet angle is an obtuse angle, the glass surface has a hydrophobic oleophobic layer. If the contact water droplet angle is an acute angle and the angle is small, the glass surface is not covered with the hydrophobic oleophobic layer. At the same time, the surface of the glass with the hydrophobic oleophobic layer is water-free, and the water droplets can slide on the screen by gravity.
There is no hydrophobic oleophobic layer under the hydrophobic oleophobic layer
You can also spray it toward the screen with a small sprayer. If the glass surface forms many small water droplets, the glass surface is covered with a hydrophobic oleophobic layer; if the glass exhibits a piece of water, the glass surface is not covered with a hydrophobic oleophobic layer.
There is no hydrophobic oleophobic layer under the hydrophobic oleophobic layer
Although the hydrophobic oleophobic layer can keep the screen smooth and clean to a certain extent, it is not once and for all. The hydrophobic oleophobic layer will wear out with the passage of time, and the hydrophobic and oleophobic effect will gradually weaken, which is why the old mobile phone screen glass is less resistant to dirt. Of course, the situation of letting the screen of the mobile phone streaking is almost non-existent. Most users will apply the film processing after purchasing the mobile phone. Therefore, there is no hydrophobic oleophobic layer on the surface of the mobile glass panel and it does not need to be too careless. But there is always better than nothing. If you don't agree, there will be readers like the author, and suddenly there is an impulse to tear off the screen to experience the silky feel.