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Aug 26, 2020
Hydrophobic silicone oil and mold release
Silicone oil has a very good hydrophobicity.The so-called hydrophobic liquid means water wettable silicone oil / airinterface reached only to a lesser extent. Size of the contact angle of waterdroplets on the surface and the surface is a measure of surface hydrophobicity.The contact angle θ is greater than 90 °, preferably represents a hydrophobic,θ less than 90 °, showing poor aqueous genus.
After viscosity (25 ℃) asdimethicone 100mm2·S-1 treated glass, ceramics, etc., its hydrophobicsurface can reach the level of paraffin, the contact angle between 90 ° ~ 100°. Treatment is immersed in a silicone oil defatted glass mass fraction of 0.5%of the chloroform solution, and after removing the solvent allowed toevaporate, then heat treated. The heat treatment temperature is 100 ℃, thecontact angle of water droplets of about 60 °. Heat treatmenttemperature is 400 ℃, the contact angle of up to 100 ° ~ 110 °. When theheat treatment temperature exceeds 400 °, the decomposition bypolydimethylsiloxane, the contact angle becomes smaller.
Hydrophobic treatment mechanism dimethiconeis by heat treatment (350 ~ 400 ℃) siloxane even point to the phase interface, the free surface ismethylated with close-packed way covered.
Hydrophobic nature is closely related tothe dimethyl silicone adhesive material or anti-stick release is very good.Hydrophobic, as a manifestation of this nature is polyorganosiloxane basicchemical properties(Such as paraffin-like nature, saturation characteristics ofmolecules and the corresponding small van der Waals forces).