Organic and inorganic combination, but this time we say that the structure of this Si-O-Si is a spiral shape, similar to the one below in the picture above. Some people say that this thing is interesting, how is it like a spring at home, I Can only say, "little, really smart." Silicone oil is also called "liquid spring", which is borrowed from this structure. (Remarks, in order to explain this structure, the black soil has been tossed for a week. It is really awkward to draw. All the articles you see only say that it is a spiral shape, but there is no picture. Oh, it is not easy to find a picture. ). At the same time, all the methyl groups are like the molecules that are pulled out, standing evenly outside.
Just like the text of the first base oil of Black Soil, you see that all the externalities are the difference in their internal structure, so before I can say the performance of silicone oil, I must first explain this structure clearly, it will be easy to say later. .


The inorganic main chain determines that the viscosity of the silicone oil is very stable. As the viscosity increases, there is no curing (this is completely different from mineral oil. I think it will basically solidify after C50). Of course, if the molecular weight of silicone oil is too large. That, then, that will also happen to solidify, but that thing becomes something else, not called silicone oil, if there is a problem, look at the last two pictures. We only discuss silicone oil here.
The most outstanding characteristics of silicone oil are: viscosity-temperature performance, the best base oil, none of them, silicone oil is a very special base oil. The conventional viscosity is KV100 and KV40, but the silicone oil is 25 degrees. Not only viscosity, density, refractive index, thermal conductivity, surface tension, conductivity and other parameters of the base are 25 degrees, you can also understand the normal temperature, can also be understood as industry habits, but indeed for many very low viscosity Volatile silicone oil (about 3) if measured 40 degrees, it may not be tested at all. However, my personal understanding is that silicone oil is very high, and I don't like ordinary people. Choosing 25 degrees can be used as a temperature line that is not high or low. Just like my girl, personality TMD is too strong, and it is not good.


Back to the topic, the silicone oil scorpion loves specialization, and creates a new parameter for the viscosity-temperature characteristic, called VTC (Viscosity-Temperature Coefficient). The definition of this parameter is: 1-Viscosity (99 degrees) / Viscosity (38 degrees) ), there are also 100 degrees and 40 degrees, the difference is not big. The common VI (viscosity index) is not the same. Generally speaking, the VTC of silicone oil is around 0.6, while other organic base oils are at 0.8 or higher. Mineral oil is no match. However, it seems that we do not compare the strength of the VI, we convert a methyl silicone oil KV40 = 64 oil (about 60 hydraulic oil), this silicone oil VI is 430, the general conventional fork fork hydraulic oil counts it 110 is good, nearly 4 times. Even after modification, such as toluyl silicone oil (phenyl content 5%), VI is 350. As another example, methyltetradecyl, this alkylene silicone oil, VI is also easily 200. And this VI conventional synthetic oil fights the old life is also not enough, those mineral oils are even more ridiculous, the taillights of the butt can not be seen, so you can mix the silicone oil and a lot of synthetic oil, but this is not easy, behind Detailed.