What is a non-stick coating?

The front side of a non-stick cookware reflects the property of "non-stick", but what is behind the non-stick material? Contrary to the front, it is "sticky". Imagine if the "non-stick" material in a non-stick pan had the same "non-stick" properties as the front side of the pan to metal materials such as aluminum, non-stick pans would not be made.

What is a non-stick coating?

If the skin doesn't survive, how will the hair survive?

Take the so-called "plastic king" of polytetrafluoroethylene to speak, it that "six relatives do not recognize" temper, who do not want to get close to it. Some people are looking at it in this strange temperament, it is the use of it to do "non-stick pans", in the family three meals a day, but also played it "a skill".

However, there are two sides to the story. In fact, many of the "molecular giants" (polymer compounds, or polymers) are a little bit of the surface of the "non-stick" properties, but the "King of Plastics" is more competent, it is almost Will not be subject to any material erosion, whether in the "aqua regia", fuming nitric acid, or even in the glass can not stop the hydrofluoric acid, it is "indifferent" - will not happen! Any change. It has no connection with water, and its water absorption rate is zero. It can be used for a long time in the range of -40 to 250 degrees Celsius. It does not dissolve in any solvents ...... It is this "inertia" that adds to the difficulties of making "non-stick pans".

Scientists find a way is: first it becomes a powder, and then add some other materials, made of a suspension, and then coated in the strict treatment of metal materials, and then plasticized at high temperatures into a continuous coating, and then quenched, the formation of good strength, toughness and adhesion of the coating. As you can see, it's not easy to get PTFE to "stick" to metal!

Although the coating process is so complex and cumbersome, but finally solved the "sticky" and "non-stick" problem. It is worth pointing out that, using the coating method, can only be a very thin layer of protective film on the material, their mechanical strength is relatively low, so the service life is limited.

Besides, many years ago, some people questioned the health effects caused by PTFE, so there are many other varieties of non-stick pans on the market, such as enameled non-stick pans, microcrystalline glass non-stick pans, etc., but no matter what kind of non-stick pans, in the use of the process must be done enough to do the "surface articles" - -Try not to let its surface wear and tear, rub hair, and can not be dry burning or high temperature frying and baking, used to such as fried chestnuts, roasted sweet potatoes. Otherwise, it will not only affect the service life of the non-stick pan, but also cause health risks.

"Bonding" new topics

"Sticky" and "non-stick" is a world of chemistry (or materials science) in both ancient and novel topics, especially how to "stick" firmly? There are a lot of articles to do, I can not say clearly, but also hope that colleagues continue to explore the popularization of science, forgive me for writing here.