Can toothpaste repair scratches on the mobile phone screen| Love to play computer games - 上海419贵族宝贝-上海后花园1314-上海品茶网-阿拉爱上海

More and more people use smart phones. In order to protect their beloved phones, manufacturers of mobile phone protective covers and screen protective films have made a lot of money. However, there is an accident in life. If you are not careful, there will be a scratch on the mobile phone screen. It will hurt the owner of the mobile phone. In order to solve the problem of scratches on the screen of the beloved airplane, the airplane friends tried their best to solve the problem, so all kinds of rumors spread. One of the most popular repair methods is that toothpaste can repair scratches on the mobile phone screen. Why can toothpaste repair scratches? I collected relevant statements from the Internet, mainly based on the following two points (the principles of the two statements are different):

1. The silicon containing substances in the toothpaste can fill scratches;

2. The friction agent in the toothpaste can smooth the fine scratches. The toothpaste contains rich friction agent, which can smooth and repair the fine scratches on the mobile phone screen.

So, are these two statements based? First, look at what ingredients are contained in the toothpaste:

Toothpaste is a complex mixture. It is usually composed of friction agent (such as calcium carbonate, calcium hydrogen phosphate, calcium pyrophosphate, silicon dioxide, aluminum hydroxide), humectant, surfactant, thickener, sweetener, preservative, active additive, pigment, essence, etc. (Via Baidu Encyclopedia)

According to netizens, what can play the role of "repair" is friction agent (about 20% - 50% of the toothpaste paste). The so-called friction agent is the very fine particles contained in toothpaste. According to the national standard, the particle size of friction agent is about 10 μ m-20 μ m. Common friction agents in toothpaste include calcium carbonate (CaCO3), calcium hydrogen phosphate (CaHPO4 • 2H2O, calcium hydrogen phosphate dihydrate), silicon dioxide (SiO2), aluminum hydroxide [A1 (OH) 3], etc.

Different toothpaste formulas will use different friction agents. For example, the United States often uses calcium hydrogen phosphate and silicon dioxide as friction agents, while China mostly uses calcium carbonate as friction agents. Therefore, calcium carbonate is more likely to "fill" the scratches.

OK， Assuming that the friction agent in the toothpaste is silicon dioxide, can it fill the scratches on the mobile phone screen? Through the inquiry of the toothpaste friction agent, we know that the particle size of the friction agent in the toothpaste is generally about 10 μ m, generally not more than 20 μ m. The particle size of some friction agents, such as light calcium carbonate, is generally 1 μ m-3 μ m, while the minimum size visible to the human eye is about 50 μ m, that is, the scratch is much larger than the particle size of the toothpaste friction agent, It is difficult to make these particles fill the scratch firmly by friction alone.

So, can you smooth the small scratches on the screen with friction agent? From the physical characteristics of commonly used toothpaste fillers, the hardness of solid calcium carbonate and silicon dioxide is about 7, which is equivalent to the hardness of glass screen. Theoretically, these two substances may play a role in polishing the screen. However, the calcium carbonate and silicon dioxide used as toothpaste friction agents are both treated light calcium carbonate and low hardness composite silicon dioxide. This is because the Mohs hardness of human enamel is about 5-6. Therefore, the toothpaste industry standard stipulates that the Mohs hardness of substances used as toothpaste friction agents should be less than 5. It is generally believed that, The Mohs hardness of toothpaste friction agent is about 4, so toothpaste cannot polish the glass screen with higher Mohs hardness.

Why do some netizens think so? This may be because of an advertisement of a toothpaste manufacturer: the experimenters found many small scratches under the microscope after rubbing other brands of toothpaste on a plexiglass plate. However, for toothpaste manufacturers, they have a special equipment called toothpaste hardness tester to test the hardness of friction agent. The test method is to rub 5 grams of toothpaste on the glass slide for 100 times. If there is any trace, it indicates that it is unqualified. It can be seen that advertising is not so reliable as evidence.

In addition, it is worth noting that when polishing with toothpaste, if there are small sand particles (Mohs hardness=7) and other impurities on the environment or polishing tools (such as eyeglass cloth), it is easy to polish the screen more. Some netizens spent more time polishing the screen with toothpaste because impurities were mixed into it.

As the saying goes, practice is the only criterion for testing truth. Although we have analyzed why the toothpaste cannot repair the screen scratches, in a rigorous manner, let's do an experiment. For the convenience of shooting, we took apart a piece iPad Screen; The black circle on the iPad in the figure is a scratch we found on the screen, and we use a black water-based pen to circle the position of the scratch on the back of the iPad screen.

We took this picture with a macro lens, and you can see a very obvious scratch

Then apply toothpaste

Rub the toothpaste on the scratches with your fingers

It takes about one minute to clean the iPad screen that has been rubbed with toothpaste with water. This is the screen after the toothpaste is washed away

Let's slowly dry the water on the screen with a paper towel

Next···

It's time to witness miracles······

Will there be any scratches? Will there be any?

Unfortunately, scratches still exist

Conclusion: Both theory and experiment have proved that toothpaste cannot repair scratches on mobile phone screens. If any netizen has tried and successfully removed the scratch, you can tell me how to do it. Of course, welcome to come Love to play computer games As a guest of the studio, such a practical method must be shared with netizens.

(Some pictures are from the network)

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