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Silicone mechanical properties of the request

Feb 6, 2018

Silicone resin is mainly used for the preparation of silicone insulation paint, silicone coatings, silicone adhesives and silicone plastics. High-end architectural coatings such as high-performance coatings is the main market silicone, the main varieties of modified polyester and modified acrylic resin. In addition, the consumption of silicones in the electronics / electrical industry has increased rapidly in recent years and is also an important driving force for the development of global silicones in the future. The market prospect is very broad.
The mechanical properties of the silicone requirements, depending on the use. Used as electrical insulating paint, paint and adhesives silicone, people are more concerned about their hardness, elasticity, thermoplasticity and adhesion. The hardness and elasticity of the silicone paint film can be varied over a wide range by adjusting the molecular structure of the resin. When the content of trifunctional or tetrafunctional chain segment is higher, that is, the larger the cross-linking density is, the film with high hardness and low elasticity can be obtained; the introduction of a large steric substituent can improve flexibility and thermoelasticity Is the reason that methylphenyl silicone is more flexible and thermoplastic than methyl silicone. Therefore, silicone without the use of special plasticizers, but by the soft, hard silicone resin with the appropriate match to meet the plastic requirements. For some coatings, pure silicone coating film hardness is insufficient, and more than thermoplastic; organic modified silicone, it is easy to solve this conflict. Pigments and catalysts can also affect the hardness and elasticity of the silicone. Pigments accelerate the oxidation of silicone paint films and convert them to harder silica glass. With low activity catalysts, only a soft coating can be obtained due to incomplete condensation reactions; conversely, hard and brittle coatings can be obtained using highly active catalysts such as compounds of Pb, Al, etc. However, catalysts such as titanium Acid ester) can not seriously reduce the flexibility of the premise, effectively improve the hardness of the coating. Silicone has good adhesion to iron, aluminum, silver, tin, glass and ceramics, but its adhesion to copper is poor. Especially at high temperature and after prolonged heat aging, it may cause oxidation of copper Acceleration of silicone pyrolysis reaction of the reason. Silicone grease on organic materials such as plastic, silicone rubber, etc., mainly depends on the latter's surface energy and compatibility with the silicone. The lower the surface energy and the poorer the compatibility of the material the more difficult to bond. Through the treatment of the substrate surface (including scrubbing and priming), especially the introduction of viscosity-increasing components in the silicone, the adhesion of the silicone to the non-stick substrate can be improved to some extent.