CN105624759A - Ceramic membrane with capillary structure and super dehumidifying and wetting performance and preparation method thereof - Google Patents

Abstract

The invention provides a ceramic membrane with a capillary structure and super dehumidifying and wetting performance. The thickness of the ceramic membrane ranges from 10 nm to 600 micrometers. The ceramic membrane comprises an aluminum compound substrate and a base membrane layer adhering to the substrate. The base membrane layer is an aluminum oxide ceramic layer. The ceramic membrane is a porous membrane with the average capillary radius of 0.1 mm to 1.2 mm, water drops with unit mass can be completely spread through the hydrophilic surface of the ceramic membrane, and a water membrane with the area not smaller than 300 cm<2>/g is formed. By means of the hydrophilic surface, water molecules can overcome self gravity, and the climbing height in the vertical direction is not smaller than 3.0 cm.

Description

Ceramic membrane with capillary structure and super dehumidifying wettability and preparation method thereof

technical field

The invention relates to a preparation method and application of a ceramic membrane, in particular to a preparation and application of a ceramic membrane with a capillary structure and super-wetting suction performance.

Background technique

Surface wettability is an important characteristic of solid surfaces, and the contact angle is usually used to characterize the wettability of liquids on solids. Generally speaking, when the contact angle between a solid surface and water is greater than 90°, it is called a hydrophobic surface; when it is less than 90°, it is called a hydrophilic surface. In recent years, it has also been proposed to use 65° contact angle as the boundary between hydrophilic and hydrophobic.

Due to its good wettability to liquids, hydrophilic surfaces can be widely used in industry and life. For example, when water vapor condenses on a hydrophilic surface, it is easy to expand into a uniform and continuous water film, inhibiting the formation of isolated water droplets, and enhancing the anti-fog and transparency of the surface, which is necessary to prevent frosting and maintain transparency (such as the inner wall of a refrigerator) , car windshield, etc.) is very important in the application. In addition, when the cooling fins of the condenser of the air conditioner are working, the water vapor in the air will condense between the fins and form water droplets. This not only reduces the heat exchange area between the fins and the air, but also increases the wind resistance, seriously affecting the cooling efficiency of the air conditioner. The coating of hydrophilic material on the cooling fins can prevent the formation of water droplets during condensation, reduce wind resistance, maintain a large heat exchange area, and thus improve the energy efficiency of the air conditioner.

The sol-gel method is one of the main methods for preparing inorganic hydrophilic coatings. The reaction can be carried out at a lower temperature, and the process is easy to control. However, this method generally requires ultraviolet light irradiation to obtain hydrophilicity. Electrochemical methods (such as electrochemical deposition, anodic oxidation, etc.) can also be used to prepare inorganic hydrophilic coatings, but special instruments and equipment are required, and it is difficult to achieve the preparation of large-area surfaces. Organic hydrophilic coatings are mostly obtained by coating, which is easy to realize large-scale production, but the hydrophilic property of the coating is not stable enough and will disappear after a certain period of use.

The hydrophilic properties of the above-mentioned hydrophilic surfaces are characterized by contact angles, and the most commonly reported contact angles are mostly between 0–30 ^° . In the current papers and patents, a hydrophilic surface with a capillary structure has not been seen, which can produce super wetting and suction for water (or other liquids).

Contents of the invention

The purpose of the present invention is to solve the above problems, and propose a ceramic membrane with a capillary structure and its preparation method and application.

The purpose of the present invention is achieved through the following technical solutions:

A ceramic membrane with a capillary structure and super moisture absorption and wetting performance, the thickness of the ceramic membrane is 10 nm to 600 μm, the ceramic membrane includes an aluminum compound substrate, and a base film layer attached to the base, the base film layer is An alumina ceramic layer, the ceramic membrane is a porous membrane with an average capillary radius of 0.1-1.2 mm, and the hydrophilic surface of the ceramic membrane can completely spread water droplets per unit mass to form water with an area of not less than 300 cm ² /g membrane; and the hydrophilic surface can make water molecules overcome their own gravity, and the height of self-climbing in the vertical direction is not less than 3.0cm.

Preferably, the preparation method of the ceramic membrane with a capillary structure comprises the following steps,

S1. Substrate pretreatment

S11. Base degreasing: put the base material in a 5%-20% sulfuric acid tank, degrease, and take it out after 3min-5min; the base material is an aluminum base material or an aluminum alloy base material;

S12, the first water washing: wash the aluminum substrate repeatedly with tap water to ensure that the pH value of the surface of the aluminum substrate is > 5;

S13. Alkali washing: put the substrate after the first water washing into a sodium hydroxide solution with a concentration of 45kg/m ³ to 55kg/m ³ and a temperature of 40°C to 60°C, and wash with alkali for 4min to 8min;

S14, the second water washing: wash the aluminum substrate repeatedly with tap water, take it out after rinsing for 2 minutes to 4 minutes;

S15. The third water washing: wash the aluminum substrate repeatedly with tap water for 2-4 minutes, and take it out after the pH value is > 5;

S16. Anodizing: Clean and oxidize in sequence with alkaline electrolyte and acidic electrolyte to promote the formation of an aluminum oxide film with high porosity and strong adsorption capacity on the surface of the metal aluminum substrate. The thickness of the aluminum oxide film is 0.3-30 μm ;

S17, the fourth water washing: wash the anodized aluminum oxide film repeatedly with tap water, take it out after rinsing for 2 minutes to 4 minutes, and then wash it with deionized water for 1 minute to 2 minutes;

S18. Drying: take out the chemically oxidized aluminum substrate, rinse it repeatedly with deionized water, and then dry it;

S2, alumina ceramic layer coating step;

S21. Preparation of raw material powder; weighing and proportioning α-alumina, organic pore forming agent, sintering aid and other batch components: the mass percentage of α-alumina is 60%-70%, the grain The diameter is 5-30 μm, the mass percentage of the organic pore-forming agent is 30%-40%, and the particle size is 3-35 μm; the mass percentage of the sintering aid is 10%-30%;

S22. Mixing of raw materials: first mix α-alumina and organic pore-forming agent evenly, and then mix with sintering aid and other batch components: α-alumina and organic pore-forming agent are 70-90%, the The sintering aid and other batch components are mixed at 10-30%;

S23, mixed grinding and stirring: add 20-30 alumina ceramic balls or steel balls with a diameter of 5-12 mm to the mixed powder, and mix and grind on the mixer for 1-3 hours;

S24. Molding: put the mixed raw materials into the mold for low-temperature preheating molding, and the preheating molding temperature is 180-250°C;

S25. Medium-temperature sintering and pore forming; transfer the formed product into a medium-temperature sintering furnace and heat it to 600°C. The heating time of the medium-temperature furnace is 2-3h, keep it warm for 1-2h, and then cool with the furnace to below 100°C , and finally remove the final porous ceramic from the furnace.

Preferably, in the method for preparing a ceramic membrane having a capillary structure and super-wettability, in the anodizing step of S16, the electrolyte includes an acidic electrolyte and an alkaline electrolyte, and the acidic electrolyte The ratio is: 20-40% by mass of formic acid; 30-50% by mass of oxalic acid; 30-50% by mass of malonic acid; 0-10% by mass of nickel sulfate. The processing parameters are: the oxidation voltage is 20-80V, The current density is 2.0～3.5A/dm2, the treatment time is 0.5～3h, and the treatment temperature is 10～25℃;

The proportion of the alkaline electrolyte is: 40-60% by mass of sodium carbonate; 15-25% by mass of sodium chromate; 2-5% by mass of sodium hydroxide; 0-1.5% by mass of trisodium phosphate. The parameters are: the oxidation voltage is 5-35V, the current density is 1.0-2.5A/dm2, the treatment time is 5-60min, and the treatment temperature is 85-100°C.

Preferably, the S24 low-temperature molding adopts an air circulation furnace or a flat furnace, the preheating temperature of the air circulation furnace is 180-250°C, and the low temperature molding time is 8-12min; the preheating temperature of the flat furnace is 180 -250℃, low temperature molding time is 3-5min.

Preferably, the first water washing in S12 takes 2 minutes to 4 minutes.

Preferably, the other batch materials in S21 are dispersion solvents.

Preferably, the mixer is a V-shaped mixer, and the mixing speed is 100-150r/min.

The ceramic membrane prepared by the present invention has super wetting, and the super wetting means that the hydrophilic surface can completely spread the water droplets per unit mass to form a water film with an area of not less than 300 cm ² /g; and the ceramic membrane has a suction effect , the suction effect means that the hydrophilic surface can make water molecules overcome their own gravity, and the height of self-climbing in the vertical direction is not less than 3.0cm.

The thermal conductivity of the ceramic film described in the present invention is measured by German Netzsch TCT426. Take a ceramic film of 30cm in length and width, insert a hot wire and a thermocouple between two samples, and turn on a heating current of 2.0A to start the test. The function of temperature rise to time is obtained, and the thermal conductivity of the ceramic film is 1.0-30W/m.K, and the overall thermal conductivity of the aluminum (or aluminum alloy substrate) can be as high as 200W/m.K. The working temperature of the ceramic membrane is as high as 600°C, and the breakdown voltage is as high as DC5000V under dry conditions. The ceramic membrane has a capillary structure, and its average capillary radius is 0.1-1.2mm, which can generate a strong capillary force for liquids, especially super-wetting suction for water.

The superwetting effect described in the present invention refers to that at normal temperature and pressure, when a drop of water (volume is about ^0.03cm3 ; quality is about 0.03g) drops on the ceramic membrane involved in the present invention (the ceramic membrane is horizontal placed), the water droplets cannot exist stably, but spread spontaneously to the surroundings, completely infiltrate the surface of the ceramic membrane, and form a continuous and uniform water film on the ceramic membrane within a few minutes. The contact area between the water film and the surface of the ceramic membrane can be as high as 40cm ² , that is to say, the contact area between the water film and the atmosphere can be as high as 40cm ² . In a nutshell, after water droplets per unit mass are spread on the ceramic membrane to form a water film, the thickness of the water film can be as thin as 7.5 μm/g, and the contact area with the atmosphere is between 300–1333 cm ² /g. Ceramic membranes also have a similar superwetting effect on other liquids.

The super suction effect of the ceramic membrane in the present invention means that at normal temperature and pressure, when the ceramic membrane is vertically immersed in water, due to the suction effect of the capillary of the ceramic membrane, the water can overcome its own gravity and move upward along the ceramic membrane. Climbing, the climbing height is generally 3.0-12.0cm higher than the liquid level. The ceramic membrane also has a similar super suction effect on other liquids.

The beneficial effects of the present invention are mainly reflected in: the present invention uses the method of combining electrochemical oxidation and slurry coating to prepare a ceramic film with a capillary structure on the surface of aluminum (or aluminum alloy), and the ceramic film has good thermal conductivity and thermal stability High performance, especially for water (and other liquids) with super wetting and suction. These effects expand the characteristics and functions of existing hydrophilic materials, and open up new application fields for hydrophilic materials, such as refrigeration and cooling, seawater desalination, and heat conduction and heat dissipation of electronic components.

Description of drawings

Below in conjunction with accompanying drawing, technical solution of the present invention will be further described:

Figure 1: Structural diagram of a ceramic membrane-based cooler with the fins of the cooler hidden.

detailed description

In the present invention, in addition to preparing ceramic films on aluminum (or aluminum alloy) planar substrates in the shape of foils, sheets, plates, etc., ceramic films can also be prepared on non-planar structures such as aluminum (or aluminum alloy) wires. Membranes are used in various occasions. There is no particular limitation on the shape of the base.

Due to the super-wetting function of the ceramic membrane, the contact area between the water film and the air formed by water droplets on the ceramic membrane is as high as 300–1333cm ² /g, that is, the heat exchange area between the water film, the ceramic film and the air is large, so the water film is easy to get from The environment absorbs heat and evaporates, changing from liquid to gas. At the same time, because the thickness of the water film is very thin (the thinnest can reach 7.5 μm/g), the temperature gradient in the thickness direction is small, which is conducive to the rapid heat absorption and rapid evaporation of the water film. Furthermore, the ceramic membrane has good thermal conductivity. After the water absorbs heat and evaporates, the temperature of the ceramic membrane and the aluminum (or aluminum alloy) substrate drops rapidly. Therefore, the ceramic membrane can be firstly used for cooling. The advantages of ceramic membranes for refrigeration and cooling are energy saving, high efficiency, and simplicity and convenience.

Super wettability test of ceramic membrane to water

Prepare a ceramic film with a width of about 10.0 cm based on aluminum foil. When a drop of water (mass is about 0.03 g, volume is about 0.03 cm ³ ) is dropped on the ceramic film with a dropper, the water drop cannot exist stably. Spread within 1s to form a water film with a diameter of about 2.0cm. The water film continued to spread, and after 32 seconds, the diameter increased to 5.2cm. When the above water film continued to spread, after 60s, the diameter increased to 6.3cm. At this time, the contact area between the liquid film and the ceramic film is about 30.2 cm ² , the corresponding contact area per unit mass is 996.6 cm ² /g, and the thickness of the water film per unit mass is 10.0 μm/g.

Calculation of Capillary Radius of Ceramic Membrane

A ceramic membrane with a length of 20cm and a width of 5cm is vertically immersed in water for 2cm, the length direction is kept perpendicular to the water surface, and 18cm of the ceramic membrane is higher than the water surface, so as to observe the phenomenon of water sucking back along the surface of the ceramic membrane. After 60 minutes, it was found that the water suck back height in the vertical direction was h=12cm. According to the formula Calculating the average radius r of the capillary in the ceramic membrane, in the formula, α=72.8mN/m is the surface tension coefficient of water; =20 ^° is the contact angle of the liquid surface in the capillary; ρ=1000kg/m ³ is the density of water; g=9.8m/s ² is the acceleration due to gravity, and r=0.1mm is obtained.

The above method is used to measure and calculate the ceramic membranes prepared in the present invention with different thicknesses and different components, and the capillary radius is obtained to be between 0.1-1.2 mm.

Comparison of Evaporation Performance of Water Film on Ceramic Membrane

Since the water droplets can spread completely on the ceramic membrane to form a very thin water film, the contact area between the water film and the air is between 300-1333cm ² /g, so compared with the water droplets of the same mass, the evaporation rate of the water film is greatly increased. Under the same ambient wind speed of 1.0m/s and ambient relative humidity of 65%, the time required for water to evaporate at different temperatures was measured.

Table 1 compares the time required for 1 drop of water (approximately 0.03g) to completely evaporate on a 10×10cm ² ceramic film (sample #1) and on a 10×10cm ² aluminum foil (sample #2) (the temperature refers to the ceramic temperature of film surface and aluminum foil surface).

It can be seen from the data in Table 1 that in the temperature range of 20–90°C, the evaporation rate of the water film is more than 10 times that of the water droplet. Especially at 20°C, it only takes 4-5 minutes for the water film to evaporate completely, while it takes at least 60 minutes for the water droplets to evaporate completely.

Table 1:

Under the same ambient relative humidity of 65%, measure the time required for water to evaporate under different ambient wind speeds and different surface temperatures.

Table 2 compares the time required for 1 drop of water (about 0.03g) to completely evaporate on a 10× ^10cm2 ceramic film (sample #1) and on a 10× ^10cm2 aluminum foil (sample#2) (the temperature refers to the ceramic temperature of film surface and aluminum foil surface).

Table 2:

Application of ceramic membrane 1:

As shown in Figure 1, it is a structural diagram of a refrigerator based on a ceramic membrane. The refrigeration principle is that there is a ceramic membrane on the inner wall of a metal (aluminum, copper, stainless steel, etc.) vacuum evaporation chamber 1, and an appropriate amount of water is controlled by a solenoid valve 2. After the water inlet pipe 3 enters the evaporation chamber 1, a water film is quickly formed on the ceramic membrane. The contact surface between the water film and the vacuum is very large, and it evaporates quickly in a vacuum state and becomes gas. Draw out the evaporation chamber to reach the water collection tank 6. Then the water droplets are input from the water inlet pipe 3, and the process of forming, evaporating, and discharging the water film is repeated in the evaporation chamber, and this cycle goes on and on, and the cycle period is controlled by the opening and closing of the solenoid valve. When the water film evaporates, it absorbs a large amount of heat from the environment. For example, 1.0g of water evaporates to absorb more than 2000J of heat, and the absorbed heat can reduce the temperature of 100g of aluminum sheet by 10°C. Therefore, the rapid evaporation of the water film causes the temperature on the surface of the evaporation chamber to drop significantly, and the cooling effect is transmitted to the ambient air by the fins, thereby achieving the cooling effect of reducing the ambient temperature.

Specifically, an aluminum evaporation chamber was fabricated with an internal volume of 12cm×6cm×2cm. When the water film was evaporated under a vacuum with a maximum negative pressure of 80KPa, it produced an obvious heat-absorbing and cooling effect: at 2 Within -3 minutes, the temperature of the outer surface of the cavity dropped rapidly from the original 25°C to 14°C, and the temperature drop was greater than 10°C.

In the above refrigeration process, the ceramic membrane plays a key role: first, the thickness of the water film formed on the ceramic membrane can be as thin as 10 μm, which reduces the temperature gradient of the water film in the thickness direction and enables it to absorb quickly. Thermal evaporation. If the thickness of the water film is too large, due to the small thermal conductivity of water (about 0.6W/m.K at 20°C), the temperature gradient in the thickness direction will be large and the heat transfer will be slow, which will affect the heat absorption and evaporation rate of water. . Second, the average thermal conductivity of the ceramic film and aluminum (or aluminum alloy) substrate is as high as 200W/m.K. Good thermal conductivity ensures that the water film can quickly absorb heat from the surface of the evaporation chamber, making the outer surface of the chamber and the connected fins The temperature drops significantly, achieving the purpose of refrigeration.

Application of Ceramic Membrane II

The principle and structure of seawater desalination based on ceramic membrane are very similar to the principle and structure of the device and refrigerator. A ceramic membrane is also prepared on the inner wall of a vacuum chamber, and an appropriate amount of seawater is introduced into the vacuum chamber by the aqueduct. Wetting spreads on the ceramic membrane to maximize the contact area with the vacuum. At the same time, due to the vacuum in the cavity, the water in the seawater evaporates quickly into water vapor, which is pumped into the water collection tank pre-installed with fresh water through the water-air dual-purpose vacuum pump. Since the thickness of the water film formed on the ceramic membrane is very thin, the water film can evaporate rapidly at room temperature (20-30°C) in a vacuum state without additional heating, and the evaporation of the water film does not require a high degree of vacuum. , The negative pressure of 80KPa can maintain fast evaporation and fresh water collection. Therefore, the advantages of seawater desalination technology using ceramic membranes are: energy saving and environmental protection, simple structural devices, easy maintenance, low cost, used ceramic membranes can be washed and recycled, and the obtained fresh water has high purity. In this seawater desalination technology, the evaporation of seawater can be carried out at room temperature, neither expensive reverse osmosis membranes are needed, nor does it need to consume a lot of electricity to heat seawater to boiling point for evaporation.

Application of ceramic membrane three

When the ceramic film is used as a heat-conducting and heat-dissipating film for electronic products, the ceramic film needs to have both excellent electrical insulation and good thermal conductivity. Therefore, the ceramic film needs to be treated accordingly. The treatment includes the following steps: firstly, the ceramic film Immerse in water glass (Na ₂ SiO ₃ ·9H ₂ O) solution for 20-40min, take it out and heat and dry at 100°C for 20-40min. Then immerse the ceramic film in the thermally conductive resin solution for 20-40 minutes, take it out and heat and dry it at 80°C for 60 minutes. The above processing steps are to seal the capillary in the ceramic film, which enhances the electrical insulation and thermal conductivity of the ceramic film. The ceramic film in the present invention is a new type of heat-conducting and heat-dissipating material, which can meet the requirements of various electrical components for heat dissipation. Require.

The present invention still has many specific implementation modes, and all technical solutions formed by adopting equivalent replacement or equivalent transformation all fall within the protection scope of the present invention.

Claims (7)

1. there is capillary structure and the ceramic membrane of super dehumidifier wetting property, it is characterized in that: described ceramic membrane thickness is 10nm��600 ��m, the base membrane layer that described ceramic membrane comprises an aluminum compound substrate, is attached in described substrate, described base membrane layer is alumina ceramic layer, described ceramic membrane is have the porous-film that average capillary radius is 0.1-1.2mm, described ceramic membrane water-wetted surface can make the water droplet of unit mass spread out completely, forms area and is not less than 300cm²The water film of/g; And water-wetted surface can make water molecules overcome self gravitation, the height of self climbing is not less than 3.0cm in the vertical direction.

2. the preparation method of the ceramic membrane with capillary structure according to claim 1, it is characterised in that: comprise the steps,

S1, substrate pretreatment

S11, substrate degreasing: base material is put into the sulfuric acid tank of 5%��20%, degreasing, take out after 3min��5min; Described base material is aluminium base or aluminum alloy base material;

S12, first time washing: repeatedly rinse aluminium base with tap water, ensure the PH value > 5 on aluminium base surface;

S13, alkali cleaning: the base material after first time washing is put into concentration is 45kg/m³��55kg/m³, temperature is in the sodium hydroxide solution of 40 DEG C��60 DEG C, alkali cleaning 4min��8min;

S14, second time washing: repeatedly rinse aluminium base with tap water, take out after rinsing 2min��4min;

S15, third time washing: repeatedly rinse aluminium base with tap water, rinse 2min��4min, take out after PH value > 5;

S16, anodic oxidation: clean oxidation sequentially with alkaline electrolyte and acid electrolyte, promote that metallic aluminium base material Surface Creation has hole height, the pellumina of high adsorption capacity, and described aluminum oxide film thickness is 0.3��30 ��m;

S17, the 4th washing: repeatedly rinsed by the pellumina tap water through anodic oxidation, rinse and take out after 2min��4min, then with deionized water rinsing 1min��2min;

S18, drying: take out the aluminium base after chemical oxidation, dry after deionized water rinses repeatedly;

S2, alumina ceramic layer coating step;

S21, raw material powder prepare; Carry out Alpha-alumina, organic pore former, sintering aid and other batch ingredients in proportion weighing proportioning: described Alpha-alumina mass percent is 60%-70%, particle diameter is 5-30 ��m, described organic pore former mass percent is 30%-40%, and particle diameter is 3-35 ��m; Described sintering aid mass percent is 10%-30%;

S22, raw material mix: after first Alpha-alumina, organic pore former being mixed, then mix with sintering aid and other batch ingredients: Alpha-alumina and organic pore former are 70-90%, described sintering aid and other batch ingredients is 10-30% mixing;

S23, mixed mill stir: add aluminium oxide ceramic ball or steel ball that 20-30 grain diameter is 5-12mm in mixed powder, mixed mill 1-3h on mixer;

S24, shaping: mixing raw material loads to carry out low-temperature prewarming in mould shaping, described preheating mold temperature is 180-250 DEG C;

S25, intermediate sintering temperature and one-tenth hole; Being proceeded in intermediate sintering temperature stove by product after shaping, be heated to 600 DEG C, the heat-up time of described middle temperature stove is 2-3h, and insulation 1-2h, then cools to less than 100 DEG C with the furnace, finally takes out last obtained porous ceramics from stove.

3. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterized in that: in the anodization step of described S16, described electrolytic solution comprises acid electrolyte and alkaline electrolyte, and described acid electrolyte proportioning is: formic acid mass percent 20��40%; Oxalic acid mass percent 30��50%; Propanedioic acid mass percent 30��50%; Single nickel salt mass percent 0��10%, process parameter is: oxidation voltage is 20��80V, and current density is 2.0��3.5A/dm2, and the treatment time is 0.5��3h, and treatment temp is 10��25 DEG C;

Described alkaline electrolyte proportioning is: sodium carbonate mass percent 40��60%; Sodium chromate mass percent 15��25%; Sodium hydroxide mass percent 2��5%; Tertiary sodium phosphate mass percent 0��1.5%, process parameter is: oxidation voltage is 5��35V, and current density is 1.0��2.5A/dm2, and the treatment time is 5��60min, and treatment temp is 85��100 DEG C.

4. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterized in that: described S24 low temperature moulding adopts air circulating oven or flattening oven, described air circulating oven preheating mold temperature is 180-250 DEG C, and the low temperature moulding time is 8-12min; Described flattening oven preheating mold temperature is 180-250 DEG C, and the low temperature moulding time is 3-5min.

5. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterised in that: the first time washing flush time in described S12 is 2min��4min.

6. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterised in that: in described S21, other batch of materials are dispersion solvent.

7. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterised in that: described mixer is the mixer of V-structure, and described batch mixing speed is 100-150r/min.