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Method for remarkably improving surface hydrophobicity of silicone rubber

A silicone rubber, hydrophobic technology, applied in the field of material surface modification, can solve the problems of reduced hydrophobic recovery ability, loss, insufficient hydrophobicity or surface energy of silicone rubber, and achieves the effect of simple process and mature technology

Active Publication Date: 2015-02-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrophobicity or surface energy of silicone rubber is still not high or low enough to completely prevent the adsorption of moisture and pollutants, resulting in pollution flashover of silicone rubber insulators under high voltage, especially in high humidity and heavy pollution the region
In addition, the hydrophobic recovery ability of silicone rubber will be reduced or lost due to the reduction or depletion of low molecular weight liquids in the body during use

Method used

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  • Method for remarkably improving surface hydrophobicity of silicone rubber
  • Method for remarkably improving surface hydrophobicity of silicone rubber
  • Method for remarkably improving surface hydrophobicity of silicone rubber

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Experimental program
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Effect test

Embodiment approach

[0024] The method of significantly improving the surface hydrophobicity of silicone rubber includes the following two processes:

[0025] 1) In a closed reaction chamber, carry out fluorination treatment to silicone rubber products or articles covered with a silicone rubber layer;

[0026] 2) In a temperature-controlled furnace, heat-crosslink the fluorinated silicone rubber product or the item covered with the silicone rubber layer.

[0027] see Figure 1 ~ Figure 3 . The wettability of a material depends on its surface chemistry and surface topography. Surface chemistry determines its intrinsic surface wettability, and surface roughness amplifies surface wettability, making a hydrophobic or hydrophilic surface more hydrophobic or hydrophilic. The first step of fluorination treatment makes the fluorine atoms replace or partially replace the hydrogen atoms in the silicone rubber, causing surface chemical changes to form a fluorinated surface layer. The second step of therm...

Embodiment 1

[0030] The fluorination treatment conditions of silicone rubber: the temperature is 55°C, the volume concentration of fluorine gas in the fluorine gas / nitrogen gas mixture is 12.5%, the pressure of the reaction gas is 1 bar, and the fluorination treatment time is 30 minutes. Thermal crosslinking conditions of fluorinated silicone rubber: 150°C, 60min. After the above-mentioned fluorination treatment and further thermal crosslinking, the water contact angles of silicone rubber are 139° and 169° respectively (due to superhydrophobicity, water droplets can only be maintained on the surface of silicone rubber through the liquid supply needle), such as Figure 4 shown.

Embodiment 2

[0032] The fluorination treatment conditions of silicone rubber: the temperature is 25°C, the volume concentration of fluorine gas in the fluorine gas / nitrogen gas mixture is 50%, the pressure of the reaction gas is 0.2 bar, and the fluorination treatment time is 60 minutes. Thermal crosslinking conditions of fluorinated silicone rubber: 180°C, 30min. After the above fluorination treatment and further thermal crosslinking, the water contact angles of silicone rubber are 129° and 144° respectively, as Figure 4 shown.

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Abstract

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.

Description

technical field [0001] The invention relates to a method capable of significantly improving the hydrophobicity of the surface of silicone rubber, which belongs to the technical field of material surface modification and is related to engineering and technical fields such as high-voltage outdoor insulation, microfluidics, medicine, biomedicine, and micro-nano. Background technique [0002] Hydrophobic materials are of great importance to many fields of science and technology. For example, most bacteria do not like hydrophobic surfaces. A hydrophobic antenna surface is less likely to form a water film in rainy days, thereby reducing the noise caused by it, or avoiding the more serious consequences caused by icing on the antenna surface in cold regions. Hydrophobic films have also been used in situations where it is desired to be "breathable", but not "water permeable", such as microelectronic devices. Silicone rubber has been widely used due to its good hydrophobicity and un...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08L83/04
Inventor 安振连谢丹莉肖欢欢
Owner TONGJI UNIV
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