Anti-fingerprint coating agent is a fluorine-containing coating made of fluorine silicone resin with a special structure. It is a transparent, colorless and odorless liquid. Its chemical name is generally heptadecafluorodecyl triethoxysilane, which is named according to the molecular structure combination of the product.
Anti-fingerprint coating has extremely low surface tension, also known as perfluoropolyether; the market also calls it AF (Anti Finger Print) anti-fingerprint coating, and in English it is called Oleophpbic coating;
The main function is to adhere to the surface of glass materials. It is widely used in glass materials of optical lenses, display screens, LCD panels, touch panels, mobile phone screens, and mobile phone films. It has the following properties: effective anti-fingerprint, anti-rust, self-cleaning, thin film, non-sticky, no viscosity, no dust, good light transmission, good hand feel, no sagging, hydrophobic, oleophobic, anti-fouling, anti-oxidation, corrosion resistance, antibacterial, etc.
At present, it is mainly divided into two types according to the operation process: 1. Baking and heating type; 2. Non-baking and heating type.
※ Surfaces treated with anti-fingerprint coatings usually have the following characteristics: ultra-thin coating protection, excellent hydrophobicity and oleophobicity, excellent anti-fouling properties, and excellent smoothness. (The smooth feel of the new mobile phone screen is attributed to it)
Design comes from life
1) Consumer needs: Products using anti-fingerprint coatings have a very good metallic texture, good anti-fingerprint, excellent hydrophobic, oleophobic, anti-fouling, and self-cleaning effects; these are one of the very important reasons why many people choose this product in life.
2) Brand owners need: In addition to having very good coating properties, the anti-fingerprint coating agent also takes into account the environmental protection process. It is recommended to choose products with excellent anti-fingerprint, wear and scratch resistance, adhesion, film thinness, light transmittance and other properties. It is not easy to adhere to fingerprints and other pollutants, is easy to clean and maintain, and can maintain product quality for a long time.
3) Reasons for your need: Antibacterial properties have been added. We are willing to choose antibacterial in all aspects of our lives, especially for families with children, the elderly and pregnant women, because they have relatively weak resistance and antibacterial can provide more effective protection. Antibacterial anti-fingerprint oil is a high-functionality UV reactive resin modified with nanoparticles. The UV-cured coating with it as the main body has outstanding wear resistance, scratch resistance and surface hardness. It is combined with organic silicon compounds to achieve good antibacterial effects. It can be used alone without curing under N2 protection.
Anti-fingerprint oil is often used in:
l Glass materials: organic glass, polycarbonate, optical lens, display screen, LCD panel, touch panel, mobile phone screen, mobile phone film, architectural glass, home glass and other surfaces.
l Metal: Steel, iron, copper, aluminum products are hydrophobic, anti-rust and anti-oxidation.
1. Baking and heating anti-fingerprint coating agent
This type of coating agent is mainly used in the industrial field; that is, during the production process of the product, before the parts are assembled. (For example: mobile phone screen glass cover, tempered film, display cover glass, touch screen glass, etc.) Because this type of anti-fingerprint coating agent has extremely high requirements in the operating process, the finished product cannot be completed.
During the construction process, the anti-fingerprint coating agent is mainly divided into two forms: liquid and target pills (similar to small pills), which are suitable for plasma spraying and vacuum plating respectively.
1. Plasma spraying
After the glass that needs to be coated is completely cured through plasma cleaning → polishing → spray coating → high-temperature baking (baking at 80~160°C for 30~120min), the anti-fingerprint coating agent will react chemically with the silica on the surface of the glass material and link to the screen surface, forming an extremely thin and uniform protective film, which changes the original uneven surface of the glass and makes the glass surface hydrophobic, oleophobic, anti-fouling, anti-fingerprint, self-cleaning, wear-resistant, and highly transmittance.
※ : When manufacturers purchase and use high-value anti-fingerprint coating agents, it is not a problem to keep the anti-fingerprint effect on the glass surface for 1~2 years.
2. Vacuum coating
Generally, vacuum coating refers to the physical method of depositing thin films. There are three forms of vacuum coating, namely evaporation coating, sputtering coating and ion coating.
Evaporation coating generally heats the target material to evaporate the surface components in the form of atomic groups or ions, and settle on the surface of the substrate, forming a thin film through the film-forming process (scattered points-island structure-vagal structure-layered growth).
Sputtering coating can be simply understood as using electrons or high-energy lasers to bombard the target material, causing the surface components to be sputtered out in the form of atomic groups or ions, and eventually deposited on the surface of the substrate, undergoing a film-forming process, and finally forming a thin film.
Ion plating is the process of using gas discharge or partial ionization of evaporated material in a vacuum chamber, depositing the evaporated material or reactant on the substrate while bombarding the gas ions or evaporated material particles. Ion plating organically combines the glow discharge phenomenon, plasma technology and vacuum evaporation, which not only significantly improves the film quality, but also expands the application range of the film. There are many types of ion plating, and the evaporation source heating methods include resistance heating, electron beam heating, plasma electron beam heating, high-frequency induction heating, etc.
※ ：However, multi-arc ion plating is very different from general ion plating. Multi-arc ion plating uses arc discharge instead of glow discharge for deposition as in traditional ion plating. Simply put, the principle of multi-arc ion plating is to use the cathode target as the evaporation source, and evaporate the target material through arc discharge between the target and the anode shell, thereby forming plasma in space and depositing on the substrate.
2. Non-baking heating anti-fingerprint coating agent
This type of coating agent is mainly used in various service areas at the back end of the product; that is, to repair the anti-fingerprint coating after the product is used (that is, the "oleophobic layer" mentioned below), to set up stalls for coating, gamers who pursue smooth mobile phones, perfectionists who pursue clean and tidy mobile phone screens, streakers who pursue the original feeling of mobile phones, and the second-hand mobile phone refurbishment industry, etc. (Application areas: mobile phone screens, tempered films, tablets, touch screens, desktop glass, bathroom glass, restaurant glass round tables, etc.) Compared with the previous type, this type of anti-fingerprint coating agent is very simple to operate: you can operate it with your hands. (A certain store on Taobao advertises "Spray it and restore the feel of a new phone")
2017 , the Huawei P10 "screen door" attracted widespread attention from netizens. The main point of controversy was that the P10 screen did not have an "oleophobic layer", which triggered explosive complaints from netizens that Huawei was cutting corners. However, many netizens were still confused about what "oleophobic layer" was.
(1) What is an oleophobic layer?
In layman's terms, it is a layer of film on the glass screen, which is the film formed by the anti-fingerprint coating agent.
Consumers commonly call: oleophobic layer, hydrophobic layer, anti-fouling coating, anti-fingerprint oil, coating liquid, nano coating liquid, nano liquid film, screen polishing repair liquid, etc. are all non-baked and heated anti-fingerprint coating agents; the most magical effect is that it is like water drops falling on lotus leaves: (The effect is as shown in the figure below)
(2) What is the use of the oleophobic layer on a mobile phone screen?
In fact, the functions of hydrophobic and oleophobic layers such as water repellency, oil drainage, and anti-fouling are not intuitive enough. Let's take an example to explain it briefly: from the popularity of smart phones → protecting mobile phone screens → mobile phone tempered glass films; at this time, many people will choose ordinary mobile phone protective films, but this cheap mobile phone protective film does not have a hydrophobic and oleophobic layer (such as the 9.9 or even 19.9 films on Taobao, Tmall, and Xixi); this cheap protective film will obviously be more jerky and rough in sliding touch. When we play with mobile phones for a long time, many fingerprints will be left on the protective film, and it is not easy to wipe clean, and it will further increase the sliding resistance.
※ : When playing King of Glory, I misplaced my skills and flashed into a wall, and the pentakill that was about to be achieved turned into a death. It can be said that the problem of gamers upgrading to professional players is more buggy than 460: "Screen shyness", that is, the original oleophobic layer of the phone is worn out, causing the screen to become uneven , and the resistance felt by the fingers when using it increases, that is, the feel becomes rough, and a large number of stains, fingerprints and bacteria remain on the screen, and it is not easy to clean.
The same is true for whether there is a hydrophobic and oleophobic layer on the phone screen glass. Without a hydrophobic and oleophobic layer, there will be a more obvious sliding resistance, and it is easy to leave fingerprints and stains and difficult to wipe. The panel glass with a hydrophobic and oleophobic layer will have much less resistance in touch sliding. Although fingerprints will still be left, it is easier to clean. If you want a mobile phone film that feels like a new phone: there are cost-effective films in some big brand stores on Tmall. (That is, expensive; after all, you get what you pay for)
(3) Test method:
- Water drop: measure water contact angle → determine hydrophobicity
- Adhesive tape: Measure adhesion → Determine surface tension
- Writing with oil pen: Test ink adhesion → Determine oleophobicity
- The easiest way is to feel the smoothness of the glass surface directly to see if it is very easy to get fingerprints and whether it is easy to clean fingerprints → judge the smoothness brought by hydrophobicity, oleophobicity and low surface tension.
Although the hydrophobic and oleophobic layer can keep the screen smooth and clean to a certain extent, it is not a permanent solution. The hydrophobic and oleophobic layer will wear out over time, and the hydrophobic and oleophobic effect will gradually weaken, which is why the screen glass of old mobile phones is less resistant to dirt. Of course, most users will apply a film to their mobile phones after purchasing them, so there is no need to worry too much about whether there is a hydrophobic and oleophobic layer on the surface of the mobile phone glass panel, but it is better to have it than not. There may be readers like me who suddenly have the urge to tear off the screen film to experience the silky feel; as for naked users, now there is a non-baked heated anti-fingerprint coating agent, so there is no need to worry at all.
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