The invention relates to a method for remarkably improving surface hydrophobicity of
silicone rubber. The method comprises the following steps: firstly, fluoridating a
silicone rubber product or a product covered with a
silicone rubber layer in a sealed
reaction chamber; secondly, in a temperature-controlled furnace, thermally crosslinking the fluoridated
silicone rubber product or the fluoridated product covered with the
silicone rubber layer, wherein the fluoridating
process conditions are as follows: the fluoridating temperature is
room temperature or 100 DEG C, the fluoridating time is 10-120 min, a
mixed gas consisting of a
fluorine gas and an
inert gas is used for fluorinating, the
volume concentration of the
fluorine gas in the
mixed gas is 5-50%, and the pressure of the
mixed gas in the
reaction chamber is 0.2-2 bars; the thermal crosslinking
process conditions are as follows: the fluoridated
silicone rubber product or the fluoridated product covered with the silicone rubber layer is put in the temperature-controlled furnace at the temperature of 120-180 DEG C for 30-120min. Compared with the prior art, the method provided by the method has the advantages as follows: by adopting the method, the silicone rubber product or the silicone rubber covering layer of the product can become remarkably hydrophobic, or even superhydrophobic; the method is especially suitable to large-scale industrial production, such as
surface modification of a silicone rubber insulator.