Why Does Silicone Rubber Stick to Metal?

by:Keyuan     2020-06-25
Through a combination of mechanical and chemical bonding, silicone rubber sealant or adhesive is bonded to many different surfaces, including metals.
In order to understand the process of curing and bonding, it is necessary to understand the physical and chemical composition of silicone rubber and metal substrates in the process of application and curing.
When a substance--
In this case, the silicone rubber adhesive-
Fill in tiny gaps in the second substance, such as metal.
The friction between the adhesive and the edge of the small defect on the solid surface acts as an adhesive that binds the two materials together.
When the metal substrate is clean and smooth but not polished, the mechanical bonding effect is best, because large irregularities and impurities (such as oil and dust) inhibit the connection between the metal and the sealant.
Chemical adhesion occurs in chemical reactions when an atom on the surface of a substance binds to an atom on the surface of another substance.
Silicone rubber is a repetitive chain of polymer, or molecules.
Each link in the chain contains atoms that are free to combine with atoms on the surface of the metal substrate, making the polymer a powerful connection that can be bent and bent while still attached to the metal below;
Valuable property when external temperature and humidity fluctuate.
Silicone rubber has different formulas so that it is suitable for all kinds of metals and is used under different conditions.
Different formulations contain chemical additives that change the composition and arrangement of the end atoms of silicone polymer connected by chemical adhesion.
They also affect the curing process and physical properties of uncured silicone liquid or paste and cured rubber sealant.
After application, the silicone rubber adhesive is physically changed from a plastic uncured product to a hard, non-permeable finished product.
This curing process is a chemical reaction precipitated by exposure to moisture in the air.
In many formulations, the reaction produces acetic acid as a waste and creates a unique odor.
Curing begins with the formation of a thin and solid skin and continues down through the thickness of the adhesive layer for a day or two until the silicone rubber is completely sturdy.
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