What is silicone? how is it made?

In our daily life, there are many common silicone products. Such as silicone nipples, silicone baking molds, silicone gloves, silicone dinnerware, etc. There are also silicone straws in the juice machine and silicone seal gaskets in the industrial machine. People may ask what’s silicone? And what’s silicon, silica?

silicone rubber products

Silicon:

Silicon is not the same thing as silicone. Silicon is one element in the periodic table, abbreviated to “Si”. Its atomic number is 14, and its atomic mass ratio is 28.085. Silicon belongs to the third period on the periodic table of the IVA group of metal-like elements。

Silicon is an extremely common element in nature. It rarely appears as an element form in nature, most widely found in rocks, gravel, and dust in the form of complex silicates or silicon dioxide. Such as Feldspar KAlSi3O8, kaolin Al2Si2O5(OH)4, talc Mg3(Si4O10)(OH)2, mica KAl2(AlSi3O10)(OH)2, asbestos H4Mg3Si2O9 and etc. In the earth’s crust, silicon is the second most abundant element (weight ratio is 26.4%), followed the oxygen (49.4%)

Silica:

Silicon is a metalloid element. Silicon can be oxidization to silicon dioxide-like metal elements. This silicon dioxide is also known as silica. So Silica is silicon dioxide, with the chemical formula: SiO2. Si(Silicon) can be oxidized in reaction to SiO2(Silica / Silicon dioxide). SiO2 can also redox reaction to Si. We just need to provide suitable chemical reaction conditions.

Silicone:

Silicone is also known as siloxanes or silicone polymer. It is a man-made polymer made up of silicon (Si), oxygen (O), carbon (C), and hydrogen (H). Silicone polymer is produced in chemical forms including Silicone Oil, Silicon Resin, and Silicone Rubber. They depend on molecular length, weight, and molecular construction (linear or mesh). The key functional group is in the Quora images as follows.

Silicone Oil is one kind of oligomer. Silicone oil is non-volatile, non-congealable, low-viscosity, and insulation at 200℃. So it’s high-quality lubricating oil especially used in the high-temperature machine system.

Silicon Resin has mesh and 3D construction. It’s flexible resin, can resist high-temperature and especially good electrical insulator. It can be used as the insulation coating material, adhesions, and so on.

Silicone Rubber includes Liquid Silicone Rubber(LSR), which is mainly used in the injection mold machine to make silicone products, such as silicone nippers and transparent silicone straws. There’s also the solid silicone rubber, which needs to be processed in the rubber mixing mill, then heated pressure and vulcanized to silicone products, such as the silicone baking mold, silicone gloves, silicone cups, etc.

So the silicone products on our website are also called silicone rubber. The silicone rubber products are made from natural silicon dioxide.

How is silicone made?

The normal chemical synthesis of the silicone polymer is the direct synthesis process. That’s Silicon (Si) powder and halohydrocarbon (dichloromethane (CH3Cl)or chlorobenzene(C6H5Cl )) reaction at high-temperature and catalyst conditions, get the mixed product Alkyl halosilane(main is R2SiCl2 and RSiCl3).

When we want to make Silicone Rubber, we need a high purity of halosilane (CH3)2SiCl2, a purity ratio of about 99.9%. The halosilane is extremely easy hydrolysis to silanol (CH3)2Si(OH)2. Silanol is vulcanized to silicone rubber by the condition of high temperature, vulcanizing agent, and filler.

While the silicon resin is the special ratio of halosilane (CH3)2SiCl2 and CH3SiCl3 mixture hydrolysis and condensation polymerization reaction to the mesh polymer.

In the next article, we share how to make silicone rubber products in our factory.

We share some silicone rubber products for your reference.

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