Preparation method of hydrophobic surface on ceramic material

A technology of ceramic material and hydrophobic surface, applied in the field of preparation of hydrophobic surface, can solve the problems of increasing porous ceramic foam distribution elements, reducing gas phase flow space, poor contact effect, etc., and achieving good thermal stability and good acid and alkali resistance. , The effect of good impact resistance

Inactive Publication Date: 2018-08-24
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the application process, due to different use occasions, the requirements for the surface properties of ceramic materials are also different. For example, the unique porous structure of ceramic foam materials can be used as a material for gas distribution in the liquid phase to maximize the open porosity. At the same time, it provides bubbles with uniform and controllable size and large gas-liquid contact area, and can overcome the shortcomings of traditional gas distribution devices such as poor gas-liquid contact effect, easy leakage, etc.
However, in some applications, because the liquid is immersed in the pores of the ceramic foam, the gas phase flow space is reduced, thereby increasing the pressure drop of the porous ceramic foam distribution element. In order to reduce the liquid entering the ceramic and suitable for hydrophobic applications, Need to enhance or prepare ceramic materials with hydrophobic surfaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation method of the hydrophobic surface of a kind of ceramic material mainly comprises SiO 2 Sol preparation process, dip coating process and silanization reaction process, comprise steps as follows:

[0024] (1) SiO 2 Sol preparation process

[0025] In the ethanol solution, add ammonia water and ethyl orthosilicate at a volume ratio of 2-4 (ammonia water): 1.5-5 (tetraethyl orthosilicate): 50 (ethanol) to prepare SiO with a particle size of 80-400nm 2 Sol; reaction temperature 15-50°C; reaction time 1-5 hours; aging time 12-48 hours;

[0026] (2) Dip coating process

[0027] Put ceramic material into SiO 2 Dip coating and pulling in the sol solution, each dip coating time is 5-60s; pulling speed is 1-5mm / s; coating gelation process is placed at 20-100°C for 1-5h.

[0028] (3) Silanization reaction process

[0029] The coupling agent is trichlorosilane, with a carbon chain length of 8-20; add a solvent to prepare a trichlorosilane solution with a concen...

Embodiment 1

[0033] The preparation method of the hydrophobic surface of a kind of ceramic material mainly comprises SiO 2 Sol preparation process, dip coating process and silanization reaction process, comprise steps as follows:

[0034] (1) SiO 2 Sol preparation process

[0035] In the ethanol solution, ammonia water and tetraethyl orthosilicate are added with a volume ratio of 2 (ammonia): 1.5 (tetraethyl silicate): 50 (ethanol) to prepare SiO with a particle size of 80 nm. 2 Sol; reaction temperature 50°C; reaction time 1 hour; aging time 12 hours;

[0036] (2) Dip coating process

[0037] Put ceramic material into SiO 2 Dip-coating and pulling were carried out in the sol solution, each dipping time was 5s; the pulling speed was 1mm / s; the gelation process of the coating was placed at 100°C for 1h.

[0038] (3) Silanization reaction process

[0039] The coupling agent is trichlorosilane with a carbon chain length of 8; add solvent to prepare a trichlorosilane solution with a conc...

Embodiment 2

[0042] The preparation method of the hydrophobic surface of a kind of ceramic material mainly comprises SiO 2 Sol preparation process, dip coating process and silanization reaction process, comprise steps as follows:

[0043] (1) SiO 2 Sol preparation process

[0044] In the ethanol solution, add ammonia and tetraethyl orthosilicate with a volume ratio of 4 (ammonia): 5 (tetraethyl silicate): 50 (ethanol) to prepare SiO with a particle size of 400 nm. 2 Sol; reaction temperature 15°C; reaction time 5 hours; aging time 48 hours;

[0045] (2) Dip coating process

[0046] Put ceramic material into SiO 2 Dip-coating and pulling were carried out in the sol solution, each dipping time was 60s; the pulling speed was 5mm / s; the coating gelation process was placed at 20°C for 5h.

[0047] (3) Silanization reaction process

[0048] The coupling agent is trichlorosilane, with a carbon chain length of 20; adding a solvent to prepare a trichlorosilane solution with a concentration of...

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Abstract

The invention relates to a preparation method of a hydrophobic surface on a ceramic material, wherein the preparation method mainly includes a SiO2 gel preparing process, a dip-coating process and a silanization reaction process. The preparation method includes steps of: 1) adding ammonia water and tetraethoxysilane to an ethanol solution to perform a reaction for preparing SiO2 sol; 2) aging theSiO2 sol for 12-48 h; 3) placing the ceramic material in the SiO2 sol solution to perform dip-coating and pulling; 4) gelatinizing the coating layer and treating the coating layer at 20-100 DEG C for1-5 h; 5) adding a solvent to trichlorosilane, as a coupling agent, to prepare a trichlorosilane solution with concentration being 2-10 mmol/L; 6) performing a reaction to the dip-coated ceramic material in the trichlorosilane solution and drying and aging the ceramic material for 1-24 h at temperature range of 50 to 150 DEG C, thus forming the hydrophobic surface on the ceramic material, even achieving ultra-hydrophobicity. The method is simple in operation. The hydrophobic surface has uniform surface performance and has good thermal stability, anti-acid/alkali performance and anti-impact property.

Description

technical field [0001] The invention relates to a method for preparing a hydrophobic surface of a ceramic material. Background technique [0002] Ceramic materials have the characteristics of high temperature resistance, oxidation resistance, acid and alkali corrosion resistance, etc. At present, it has been widely used in many fields such as chemical industry, energy, environmental protection, metallurgy, machinery, transportation, electronics and national defense. [0003] In the application process, due to different use occasions, the requirements for the surface properties of ceramic materials are also different. For example, the unique porous structure of ceramic foam materials can be used as a material for gas distribution in the liquid phase to maximize the open porosity. At the same time, it provides bubbles with uniform and controllable size and large gas-liquid contact area, and can overcome the shortcomings of traditional gas distribution devices such as poor gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B41/5035C04B41/4554C04B41/4933C04B41/4558C04B35/10C04B35/14C04B35/48C04B35/565C04B35/584
Inventor 李洪闫鹏高鑫李鑫钢
Owner TIANJIN UNIV
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