Method of forming hydrophobic transparent film on the surface of different substrates

Abstract

The present invention is method for forming hydrophobic transparent film on the surface of different substrates, glass, ceramic, metal, paint, etc. fluorosilane and other components are painted to the surface of plastic or paint with hydroxyl radical containing oxide film form in advance or the surface of other kind of substrate directly. Under the action of catalyst, the ethoxy group connected to the Si atom in fluorosilane is hydrolyzed into hydroxyl radical in advance, and the hydrolyzed solution is maintained in monohydric alcohol dihydrolic alcohol or other organic solvent, and the hydrolyzed fluorosilane reacts with the metal hydroxyl radical bond in the surface of the oxide to obtain high stability M-O-Si bonding. The formed film of several nanometer to decades nanometer thickness is firmly combined with the substrate chemically at normal temperature without need of heat treatment.

Description

technical field

[0001] The invention relates to a method for forming a hydrophobic transparent film on the surface of various substrates, and the substrates include glass, ceramics, metal and paint. The invention particularly relates to a hydroxyfluorosilane solution and a method for forming a stable hydrophobic film after being fixed on the surface of various materials. Background technique

[0002] The contact angle of water on the surface is greater than 90° for hydrophobic (also known as hydrophobic) surface, less than 90° for hydrophilic surface, general metal and glass glass surface is hydrophilic surface, and the contact angle of the upper surface of ordinary flat soda silica glass is about 30° °. The hydrophilic or hydrophobic state of the surface of plastic and paint is related to its composition and use state. Plastic products such as polyethylene (PE) are hydrophobic materials. The reason for mentioning the use is that after long-term use in the light and air, t...

Examples

Embodiment 1

[0030] Weigh 10g tridecafluorooctyltriethoxysilane CF 3 (CF 2 ) 5 C 2 h 4 Si(OC 2 h 5 ) 3 and 5g tetraethyl orthosilicate (molecular formula Si(OC 2 h 5 ) 4 , was added to 82.2g of isopropanol, followed by 2.8g of 0.1M HNO 3 , refluxed at 40° C. for 12 hours to obtain hydroxylated fluorosilane containing silicon oxide nanoparticles, containing 10% fluorine silane (calculated as tridecafluorooctyltriethoxysilane). After cooling, it was diluted with isopropanol at a mass ratio of 1:5, so that the contained fluorosilane was 2% (based on tridecafluorooctyltriethoxysilane). Double-sided coating of glass at room temperature, the dosage is 15ml / m 2 . After wiping with a soft cloth, the contact angle was measured to be 108 degrees without heat treatment for 24 hours. 2 in Figure 1 shows the light transmittance curve of the glass after transparent coating of this liquid, and the transmittance of the glass after coating not only does not decrease, but also increases slightl...

Embodiment 2

[0032] Weigh 15g tridecafluorooctyltriethoxysilane CF 3 (CF 2 )5C 2 h 4 Si(OC 2 h 5 ) 3 and 2g tetraethyl orthosilicate (molecular formula Si(OC 2 h 5 ) 4 , was added to 80.7g of isopropanol, then 2.3g of 0.1M HCl was added, and refluxed at 70°C for 0.5 hour to obtain a hydroxylated fluorosilane containing silica nanoparticles, 15% of fluorine-containing silane (as tridecafluorooctyltri Ethoxysilane meter). After cooling, it was diluted with isopropanol at a mass ratio of 1:10, so that the contained fluorosilane was 1.5% (based on tridecafluorooctyltriethoxysilane). The fluorosilane that gets 50g is that 1.5% (in tridecafluorooctyltriethoxysilane) solution is mixed with the isopropanol colloid dispersion liquid of 50g containing silicon oxide aerosol 1.0%, the fluorosilane after mixing is 0.75%, containing 0.5% silicon oxide. Double-sided coating of glass at room temperature, the dosage is 15ml / m 2 . After wiping with a soft cloth, the contact angle measured witho...

Embodiment 3

[0034] Dilute the commercial silica sol to contain 1.0% silicon oxide, the primary particle size of silicon oxide in it is about 10nm, and coat the paint surface at room temperature, the dosage is 20ml / m 2 . Wipe it evenly with a soft cloth, and apply diluted fluorosilane containing silica airgel after 15 minutes. The preparation is the same as in Example 2, wherein the fluorosilane contains 0.75% and the silica contains 0.5%. Coat the paint surface at room temperature, the dosage is 20ml / m 2 . After wiping with a soft cloth, the contact angle was measured to be 105 degrees in 24 hours. The measurement and calculation methods of the contact angle have been explained in the main text.

technical field

[0001] The invention relates to a method for forming a hydrophobic transparent film on the surface of various substrates, and the substrates include glass, ceramics, metal and paint. The invention particularly relates to a hydroxyfluorosilane solution and a method for forming a stable hydrophobic film after being fixed on the surface of various materials. Background technique

[0002] The contact angle of water on the surface is greater than 90° for hydrophobic (also known as hydrophobic) surface, less than 90° for hydrophilic surface, general metal and glass glass surface is hydrophilic surface, and the contact angle of the upper surface of ordinary flat soda silica glass is about 30° °. The hydrophilic or hydrophobic state of the surface of plastic and paint is related to its composition and use state. Plastic products such as polyethylene (PE) are hydrophobic materials. The reason for mentioning the use is that after long-term use in the light and air, t...

Examples

Embodiment 1

[0030] Weigh 10g tridecafluorooctyltriethoxysilane CF 3 (CF 2 ) 5 C 2 h 4 Si(OC 2 h 5 ) 3 and 5g tetraethyl orthosilicate (molecular formula Si(OC 2 h 5 ) 4 , was added to 82.2g of isopropanol, followed by 2.8g of 0.1M HNO 3 , refluxed at 40° C. for 12 hours to obtain hydroxylated fluorosilane containing silicon oxide nanoparticles, containing 10% fluorine silane (calculated as tridecafluorooctyltriethoxysilane). After cooling, it was diluted with isopropanol at a mass ratio of 1:5, so that the contained fluorosilane was 2% (based on tridecafluorooctyltriethoxysilane). Double-sided coating of glass at room temperature, the dosage is 15ml / m 2 . After wiping with a soft cloth, the contact angle was measured to be 108 degrees without heat treatment for 24 hours. 2 in Figure 1 shows the light transmittance curve of the glass after transparent coating of this liquid, and the transmittance of the glass after coating not only does not decrease, but also increases slightl...

Embodiment 2

[0032] Weigh 15g tridecafluorooctyltriethoxysilane CF 3 (CF 2 )5C 2 h 4 Si(OC 2 h 5 ) 3 and 2g tetraethyl orthosilicate (molecular formula Si(OC 2 h 5 ) 4 , was added to 80.7g of isopropanol, then 2.3g of 0.1M HCl was added, and refluxed at 70°C for 0.5 hour to obtain a hydroxylated fluorosilane containing silica nanoparticles, 15% of fluorine-containing silane (as tridecafluorooctyltri Ethoxysilane meter). After cooling, it was diluted with isopropanol at a mass ratio of 1:10, so that the contained fluorosilane was 1.5% (based on tridecafluorooctyltriethoxysilane). The fluorosilane that gets 50g is that 1.5% (in tridecafluorooctyltriethoxysilane) solution is mixed with the isopropanol colloid dispersion liquid of 50g containing silicon oxide aerosol 1.0%, the fluorosilane after mixing is 0.75%, containing 0.5% silicon oxide. Double-sided coating of glass at room temperature, the dosage is 15ml / m 2 . After wiping with a soft cloth, the contact angle measured witho...

Embodiment 3

[0034] Dilute the commercial silica sol to contain 1.0% silicon oxide, the primary particle size of silicon oxide in it is about 10nm, and coat the paint surface at room temperature, the dosage is 20ml / m 2 . Wipe it evenly with a soft cloth, and apply diluted fluorosilane containing silica airgel after 15 minutes. The preparation is the same as in Example 2, wherein the fluorosilane contains 0.75% and the silica contains 0.5%. Coat the paint surface at room temperature, the dosage is 20ml / m 2 . After wiping with a soft cloth, the contact angle was measured to be 105 degrees in 24 hours. The measurement and calculation methods of the contact angle have been explained in the main text.

Images