In 1943, silicone resin was industrially produced by direct synthesis of silicone monomer and used as a high temperature insulating coating.


After decades of development, the silicone materials used in coatings have not only been limited to silicone resins. With the development of the electronics industry, coatings and inks based on silicone rubber have also developed rapidly. In order to improve the performance of coatings, various silicone oils and their secondary processed products have also been widely used as functional additives for coatings. Broadly speaking, fabric finishes, leather finishes, and paper release agents are also silicone coatings on fabric, leather, and paper surfaces, but they are not currently included in the coatings industry.
Application of silicone in coatings
The application of silicones in coatings, including inks, has evolved from specialized, high performance coatings to a wider range of applications. The application of silicone technology can improve the insulation, heat resistance, weather resistance, antifouling, abrasion resistance and other properties of the coating, which will be described below according to its use.


1
Insulation Materials
The first application of silicone as a coating is silicone-impregnated fiberglass tape, which acts as a wire insulation layer on US Navy submarines. In the 1950s, China developed silicone resin. In the initial stage, it was mainly used for the insulation impregnation of H-class motor coils, the impregnation of fiber-optic fabrics for H-class motors and the fiberglass cloth for slot insulation, and the impregnation of glass fiber insulation sleeves. Mica tape for insulation, etc.
2
Primer
The bonding force between the coating and the substrate includes mechanical bonding force, chemical bonding force, diffusion force, and dipole force. The amount of bonding directly affects the adhesion of the coating.
*Adhesion promoter


Alkoxysilanes (primarily various silane coupling agents) must be used as adhesion promoters at the interface between the coating and the substrate or the interface between the sealant and the binder material to increase tack. The adhesion promoter is usually used as a primer. The silane is formulated into a 0.5% to 5% ethanol or alcohol water dilution solution, and then adhered to the surface of the substrate by coating or spraying. In addition to increasing the viscosity, silane primers can also improve hydrophobicity, UV resistance, weatherability, thermal stability, surface activity, chemical resistance and corrosion resistance. The adhesion promoter is selected to match the organic molecules in the coating. The compatibility of the common adhesion promoter with the polymer is shown in Table 1.

Metals include ferrous metals (such as steel) and non-ferrous metals (such as aluminum alloys), which are surface treated for rust prevention. There are many methods for surface treatment, and cathodic protection surface treatment is a commonly used method. In the cathodic protection process, a zinc-rich primer is used. Zinc powder is a chemically active raw material. The electrode potential of zinc is 0.7628V, and the electrode potential of iron is 0.409V. The zinc powder in the paint film contacts each other and is in contact with steel to conduct electricity. Therefore, when the steel structure coated with the zinc-rich primer is corroded, since the electrode potential of the metal zinc is wider than iron in a wide temperature range, zinc is an anode, is corroded, and iron is protected by the cathode, thereby serving as a sacrificial anode. Cathodic protection. At the same time, the product after the corrosion of the zinc powder can fill the pores of the coating film, close the damaged portion of the coating film, and function as a shielding corrosion medium. Therefore, although the coating of the zinc-rich coating is relatively thin, it still has a good rust-preventing effect and a long service life.

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