CN111499415A - Ceramic flat membrane coating preparation method based on capillary impregnation method - Google Patents
Ceramic flat membrane coating preparation method based on capillary impregnation method Download PDFInfo
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Abstract
The invention relates to the technical field of ceramic flat membrane, in particular to a preparation method of a ceramic flat membrane coating based on a capillary impregnation method. The method comprises the following steps: placing the coating material, water and fluxing agent in a weight ratio of 1: 0.2 into a ball mill stirrer for mixing; pouring the uniformly mixed slurry into a slurry tank; completely immersing the ceramic flat plate into the slurry in the slurry tank; taking out the ceramic flat plate and naturally drying; then the ceramic flat plate is completely immersed into the slurry in the slurry tank; taking out the ceramic flat plate, heating and drying the ceramic flat plate, and controlling the temperature to be 30-35 ℃ until a forming film is formed on the surface of the ceramic flat plate; placing the mixture into a high-temperature kiln for sintering. The design of the invention can completely absorb the feed liquid in the holes of the ceramic flat plate and improve the uniform effect of the distribution of the coating.
Description
Technical Field
The invention relates to the technical field of ceramic flat membrane, in particular to a preparation method of a ceramic flat membrane coating based on a capillary impregnation method.
Background
The plate surface of the flat ceramic membrane is densely distributed with micropores, according to the fact that the permeability is different when the diameters of molecules of permeated substances are different within a certain membrane aperture range, the pressure difference between two sides of the membrane is used as a driving force, the membrane is used as a filtering medium, and under the action of a certain pressure, when feed liquid flows through the surface of the membrane, only water, inorganic salt and small molecular substances are allowed to permeate through the membrane, and macromolecular substances such as suspended matters, glue, microorganisms and the like in the water are prevented from passing through the membrane. When the existing ceramic flat membrane coating is prepared, because the surface of the flat membrane has a plurality of small holes, the coating can not permeate into the holes, and the effect of the coating is influenced.
Disclosure of Invention
The invention aims to provide a preparation method of a ceramic flat membrane coating based on a capillary impregnation method, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention aims to provide a method for preparing a ceramic flat membrane coating based on a capillary impregnation method, which comprises the following steps:
s1.1, placing the coating material, water and the fluxing agent in a ball mill stirrer according to the weight ratio of 1: 0.2 for mixing, controlling the stirring speed to be 200 and 250rpm, and stirring for 2-4 h;
s1.2, pouring the uniformly mixed slurry into a slurry tank;
s1.3, completely immersing the ceramic flat plate into the slurry in the slurry tank for 5-8 hours;
s1.4, taking out the ceramic flat plate and naturally airing;
s1.5, completely immersing the ceramic flat plate into the slurry in the slurry tank for 10-15 h;
s1.6, taking out the ceramic flat plate, heating and drying, and controlling the temperature at 30-35 ℃ until a forming film is formed on the surface of the ceramic flat plate;
s1.7, placing the mixture into a high-temperature kiln for sintering, wherein the sintering temperature is 1430-.
As a further improvement of the technical scheme, the coating material is alumina powder.
The preparation method of the alumina powder comprises the following steps: dissolving aluminum nitrate nonahydrate in ethanol to prepare an aluminum nitrate ethanol solution, adjusting the pH value to 2.8-3.0, adding citric acid, heating to 70 ℃ to enable the reaction to last for more than 7 hours until the reaction is complete, aging for 12 hours, and grinding into powder with the particle size of 5-8 mu m by using a ball mill.
As a further improvement of the technical scheme, the coating material is silicon oxide powder.
The preparation method of the silicon oxide powder comprises the following steps: adding absolute ethyl alcohol into a beaker, adding deionized water, stirring uniformly, adding tetraethoxysilane into the beaker, stirring simultaneously to form a silane solution, adjusting the pH value of the silane solution to 7 by using a 1:1 ammonia water solution, stirring for 10min, putting the silane solution into a water bath kettle, aging for 1h at the temperature of 35 ℃, dropwise adding concentrated ammonia water into the solution until just jelly-shaped gel is generated, standing until the solution is completely converted into gel, mashing the obtained gel and putting the mashed gel into an oven, wherein the oven temperature is 100 ℃, and drying.
As a further improvement of the technical scheme, the coating material is titanium dioxide powder.
The preparation method of the titanium dioxide powder comprises the steps of taking titanium alkoxide as a raw material, dissolving the titanium alkoxide in solvents such as ethanol, propanol and butanol to form a homogeneous solution, carrying out hydrolysis reaction on the titanium alkoxide at a level with uniform molecules, simultaneously carrying out polycondensation reaction of dehydration and alcohol loss, aggregating the resultant into particles to form sol, ageing to form gel of a three-dimensional network, drying to remove residual moisture, organic groups and organic solvents to obtain dry gel, and grinding and calcining to form the titanium dioxide powder.
As a further improvement of the technical scheme, the coating material is mullite powder.
As a further improvement of the technical scheme, the preparation method of the mullite powder comprises the following steps:
s2.1, grinding silicon oxide and aluminum oxide into powder, and mixing;
s2.2, pouring the mixed powder into a ball mill, adding absolute ethyl alcohol, and carrying out ball milling for 3 hours;
s2.3, putting the mixed powder after ball milling into an oven, and drying at 60 ℃;
s2.4, placing the dried mixture powder into a muffle furnace for sintering, wherein the sintering temperature is 1500 ℃, the temperature is kept for 2 hours, the heating rate is 10 ℃/min, and the cooling rate is 5 ℃/min;
s2.5, sieving the sintered powder by a 320-mesh sieve to prepare the mullite powder with the particle size of 0.7 mu m.
As a further improvement of the technical scheme, the fluxing agent is dimethylacetamide.
The alumina film prepared by the alumina powder has good quality, no obvious crack and protective function of oxidation corrosion resistance at high temperature.
The silicon oxide film is prepared by adopting the silicon oxide powder, unsaturated residual bonds and hydroxyl groups in different bonding states exist on the surface of the silicon oxide film, the molecular state of the silicon oxide film is in a three-dimensional chain structure, and when the silicon oxide film is prepared by adopting the silicon oxide powder, the silicon oxide can quickly form a network structure, so that the aging resistance, the smoothness and the strength of the silicon oxide film are improved.
The titanium dioxide film prepared by titanium dioxide powder can prevent corrosive medium from directly contacting with a matrix, thereby reducing the proportion of the atomic number of the surface of the corrosive material to be large, the adjacent atoms are lacked around the surface atoms, the film has unsaturated property, when the film is acted with other components, a large acting force is generated between two mixed phases, the material is strengthened and toughened to a great extent, meanwhile, the titanium dioxide generates superoxide dismutase under the action of ultraviolet rays in light, can kill black variant spores of bacillus subtilis, pseudomonas aeruginosa, escherichia coli, staphylococcus aureus, salmonella, dental branch bacteria and aspergillus, and can effectively kill harmful bacteria.
The mullite film made of the mullite powder can prevent the environmental medium from directly contacting with the material, improve the high-temperature oxidation resistance of the non-oxide material, prolong the service life of the material and simultaneously have the thermal shock absorption effect.
Compared with the prior art, the invention has the beneficial effects that: according to the preparation method of the ceramic flat membrane coating based on the capillary impregnation method, the coating material is adsorbed in the holes of the ceramic flat plate through capillary pressure based on the capillary impregnation method, then water in the holes of the ceramic flat plate is evaporated firstly and is separated out along with slurry crystallization to form a liquid membrane, the liquid membrane is evaporated and migrates along with solution in small holes to the wall of the large hole and is separated out slurry crystallization, finally the ceramic flat membrane coating is placed into a high-temperature kiln to be fired, the slurry crystallization formed on the surface of the ceramic flat plate is dehydrated, thermally decomposed and recrystallized, finally, microcrystals are sintered to form a membrane layer with high mechanical strength, and the coating can be adsorbed on the surface of the ceramic flat plate uniformly.
Drawings
FIG. 1 is a flow chart of a method for preparing an integral ceramic flat membrane coating;
fig. 2 is a flow chart of a method for preparing mullite powder of example 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment aims to provide a method for preparing a ceramic flat membrane coating based on a capillary dipping method, which comprises the following steps:
s1.1, placing the coating material, water and the fluxing agent in a ball mill stirrer according to the weight ratio of 1: 0.2 for mixing, controlling the stirring speed to be 200 and 250rpm, and stirring for 2-4 h;
s1.2, pouring the uniformly mixed slurry into a slurry tank;
s1.3, completely immersing the ceramic flat plate into the slurry in the slurry tank for 5-8 hours;
s1.4, taking out the ceramic flat plate and naturally airing;
s1.5, completely immersing the ceramic flat plate into the slurry in the slurry tank for 10-15 h;
s1.6, taking out the ceramic flat plate, heating and drying, and controlling the temperature at 30-35 ℃ until a forming film is formed on the surface of the ceramic flat plate;
s1.7, placing the mixture into a high-temperature kiln for sintering, wherein the sintering temperature is 1430-.
In this embodiment, the coating material is alumina powder, and the preparation method of the alumina powder is as follows: dissolving aluminum nitrate nonahydrate in ethanol to prepare an aluminum nitrate ethanol solution, adjusting the pH value to 2.8-3.0, adding citric acid, heating to 70 ℃ to enable the reaction to last for more than 7 hours until the reaction is complete, aging for 12 hours, and grinding the mixture into powder with the particle size of 5-8 mu m by using a ball mill; the alumina film prepared by adopting the alumina powder has good quality, no obvious crack and protective function of oxidation and corrosion resistance at high temperature.
Further, in S1.13, the ceramic plate is completely immersed in the slurry tank, the surface of the ceramic plate is wet, the pores in the ceramic plate suck the slurry into the pores by capillary pressure, and the formula of the capillary pressure is as follows:
pk＝P+ρglsinβ；
in the formula, pkFor capillary pressure, P is the driving force of the liquid moving in the capillary, ρ is the acceleration of free fall, l is the depth of dip, and β is the bending coefficient of the capillary.
Specifically, in S1.15, the ceramic flat plate is again completely immersed in the slurry tank, so that the slurry is adsorbed and spread on the surface of the ceramic flat plate.
In S1.16, the ceramic plate is heated and dried to evaporate water in the pores of the ceramic plate and precipitate slurry crystals, thereby forming a liquid film, and the liquid film evaporation is accompanied by migration of the solution in the smaller pores to the walls of the larger pores, thereby precipitating the slurry crystals.
In addition, in S1.7, the ceramic plate is placed in a high-temperature kiln to be sintered, so that slurry crystals formed on the surface of the ceramic plate are dehydrated, thermally decomposed and recrystallized, and finally, microcrystals are sintered to form a film layer with high mechanical strength.
Example 2
As shown in fig. 1, the present embodiment aims to provide a method for preparing a ceramic flat membrane coating based on a capillary dipping method, which comprises the following steps:
s1.1, placing the coating material, water and the fluxing agent in a ball mill stirrer according to the weight ratio of 1: 0.2 for mixing, controlling the stirring speed to be 200 and 250rpm, and stirring for 2-4 h;
s1.2, pouring the uniformly mixed slurry into a slurry tank;
s1.3, completely immersing the ceramic flat plate into the slurry in the slurry tank for 5-8 hours;
s1.4, taking out the ceramic flat plate and naturally airing;
s1.5, completely immersing the ceramic flat plate into the slurry in the slurry tank for 10-15 h;
s1.6, taking out the ceramic flat plate, heating and drying, and controlling the temperature at 30-35 ℃ until a forming film is formed on the surface of the ceramic flat plate;
s1.7, placing the mixture into a high-temperature kiln for sintering, wherein the sintering temperature is 1430-.
In this embodiment, the coating material is silica powder, and the preparation method of the silica powder is as follows: adding absolute ethyl alcohol into a beaker, adding deionized water, stirring uniformly, adding tetraethoxysilane into the beaker, stirring simultaneously to form a silane solution, adjusting the pH value of the silane solution to 7 by using a 1:1 ammonia water solution, stirring for 10min, putting the silane solution into a water bath kettle, aging for 1h at the water temperature of 35 ℃, dropwise adding concentrated ammonia water into the solution until the solution just generates jelly-shaped gel, standing until the solution is completely converted into gel, putting the obtained gel in an oven, and drying at the oven temperature of 100 ℃; unsaturated residual bonds and hydroxyl groups in different bonding states exist on the surface of the silicon oxide powder, the molecular state of the silicon oxide powder is in a three-dimensional chain structure, and when the silicon oxide powder is prepared into a silicon oxide film, the silicon oxide can quickly form a network structure, so that the aging resistance, the smoothness and the strength of the silicon oxide film are improved.
Further, in S1.23, the ceramic plate is completely immersed in the slurry tank, the surface of the ceramic plate is wet, the pores in the ceramic plate suck the slurry into the pores through capillary pressure, and the formula of the capillary pressure is as follows:
pk＝P+ρglsinβ；
in the formula, pkFor capillary pressure, P is the driving force of the liquid moving in the capillary, ρ is the acceleration of free fall, l is the depth of dip, and β is the bending coefficient of the capillary.
Specifically, in S1.25, the ceramic flat plate is again completely immersed in the slurry tank, so that the slurry is adsorbed and spread on the surface of the ceramic flat plate.
In S1.26, the ceramic plate is heated and dried to evaporate water in the pores of the ceramic plate and precipitate slurry crystals to form a liquid film, and the liquid film evaporation is accompanied by migration of the solution in the smaller pores to the walls of the larger pores to precipitate the slurry crystals.
In addition, in S1.7, the ceramic plate is placed in a high-temperature kiln to be sintered, so that slurry crystals formed on the surface of the ceramic plate are dehydrated, thermally decomposed and recrystallized, and finally, microcrystals are sintered to form a film layer with high mechanical strength.
Example 3
As shown in fig. 1, the present embodiment aims to provide a method for preparing a ceramic flat membrane coating based on a capillary dipping method, which comprises the following steps:
s1.1, placing the coating material, water and the fluxing agent in a ball mill stirrer according to the weight ratio of 1: 0.2 for mixing, controlling the stirring speed to be 200 and 250rpm, and stirring for 2-4 h;
s1.2, pouring the uniformly mixed slurry into a slurry tank;
s1.3, completely immersing the ceramic flat plate into the slurry in the slurry tank for 5-8 hours;
s1.4, taking out the ceramic flat plate and naturally airing;
s1.5, completely immersing the ceramic flat plate into the slurry in the slurry tank for 10-15 h;
s1.6, taking out the ceramic flat plate, heating and drying, and controlling the temperature at 30-35 ℃ until a forming film is formed on the surface of the ceramic flat plate;
s1.7, placing the mixture into a high-temperature kiln for sintering, wherein the sintering temperature is 1430-.
In the embodiment, titanium dioxide powder is selected as a coating material, and the preparation method of the titanium dioxide powder comprises the steps of taking titanium alkoxide as a raw material, dissolving the titanium alkoxide in solvents such as ethanol, propanol and butanol to form a homogeneous solution, carrying out hydrolysis reaction on the titanium alkoxide at a level with uniform molecules, simultaneously carrying out polycondensation reaction of dehydration and alcohol loss, aggregating the resultant into particles to form sol, ageing to form three-dimensional network gel, drying to remove residual moisture, organic groups and organic solvents to obtain dry gel, and grinding and calcining to form the titanium dioxide powder; the titanium dioxide film prepared from the titanium dioxide powder can prevent a corrosive medium from directly contacting with a matrix, so that the proportion of the atomic number of the surface of the corrosive material is reduced, adjacent atoms are lacked around the surface atoms, the unsaturated nature is achieved, when the titanium dioxide film is acted with other components, a large acting force is generated between two mixed phases, the material is strengthened and toughened to a great extent, and meanwhile, the titanium dioxide generates superoxide dismutase under the action of ultraviolet rays in light, so that black variant spores, pseudomonas aeruginosa, escherichia coli, staphylococcus aureus, salmonella, dental branch bacteria and aspergillus can be killed, and harmful bacteria can be effectively killed.
Further, in S1.33, the ceramic plate is completely immersed in the slurry tank, the surface of the ceramic plate is wet, the pores in the ceramic plate suck the slurry into the pores through capillary pressure, and the formula of the capillary pressure is as follows:
pk＝P+ρglsinβ；
in the formula, pkFor capillary pressure, P is the driving force of the liquid moving in the capillary, ρ is the acceleration of free fall, l is the depth of dip, and β is the bending coefficient of the capillary.
Specifically, in S1.35, the ceramic flat plate is again completely immersed in the slurry tank, so that the slurry is adsorbed and spread on the surface of the ceramic flat plate.
In S1.36, the ceramic flat plate is heated and dried to evaporate water in the pores of the ceramic flat plate and precipitate slurry crystals, so that a liquid film is formed, and the liquid film evaporation is accompanied by migration of the solution in the smaller pores to the walls of the larger pores, so that the slurry crystals precipitate.
In addition, in S1.7, the ceramic plate is placed in a high-temperature kiln to be sintered, so that slurry crystals formed on the surface of the ceramic plate are dehydrated, thermally decomposed and recrystallized, and finally, microcrystals are sintered to form a film layer with high mechanical strength.
Example 4
As shown in fig. 1-2, the present embodiment aims to provide a method for preparing a ceramic flat membrane coating based on a capillary dipping method, which comprises the following steps:
s1.1, placing the coating material, water and the fluxing agent in a ball mill stirrer according to the weight ratio of 1: 0.2 for mixing, controlling the stirring speed to be 200 and 250rpm, and stirring for 2-4 h;
s1.2, pouring the uniformly mixed slurry into a slurry tank;
s1.3, completely immersing the ceramic flat plate into the slurry in the slurry tank for 5-8 hours;
s1.4, taking out the ceramic flat plate and naturally airing;
s1.5, completely immersing the ceramic flat plate into the slurry in the slurry tank for 10-15 h;
s1.6, taking out the ceramic flat plate, heating and drying, and controlling the temperature at 30-35 ℃ until a forming film is formed on the surface of the ceramic flat plate;
s1.7, placing the mixture into a high-temperature kiln for sintering, wherein the sintering temperature is 1430-.
In this embodiment, the coating material is mullite powder, and the preparation method of the mullite powder includes the following steps:
s2.1, grinding silicon oxide and aluminum oxide into powder, and mixing;
s2.2, pouring the mixed powder into a ball mill, adding absolute ethyl alcohol, and carrying out ball milling for 3 hours;
s2.3, putting the mixed powder after ball milling into an oven, and drying at 60 ℃;
s2.4, placing the dried mixture powder into a muffle furnace for sintering, wherein the sintering temperature is 1500 ℃, the temperature is kept for 2 hours, the heating rate is 10 ℃/min, and the cooling rate is 5 ℃/min;
s2.5, sieving the sintered powder by a 320-mesh sieve to prepare the mullite powder with the particle size of 0.7 mu m.
The mullite film made of the mullite powder can prevent an environmental medium from directly contacting with the material, improve the high-temperature oxidation resistance of the non-oxide material, prolong the service life of the material and simultaneously have the thermal shock absorption effect.
Further, in S1.43, the ceramic plate is completely immersed in the slurry tank, the surface of the ceramic plate is wet, the pores in the ceramic plate suck the slurry into the pores through capillary pressure, and the formula of the capillary pressure is as follows:
pk＝P+ρglsinβ；
in the formula, pkFor capillary pressure, P is the driving force of the liquid moving in the capillary, ρ is the acceleration of free fall, l is the depth of dip, and β is the bending coefficient of the capillary.
Specifically, in S1.45, the ceramic flat plate is again completely immersed in the slurry tank, so that the slurry is adsorbed and spread on the surface of the ceramic flat plate.
In S1.46, the ceramic flat plate is heated and dried to evaporate water in the pores of the ceramic flat plate and precipitate slurry crystals, so that a liquid film is formed, and the liquid film evaporation is accompanied by migration of the solution in the smaller pores to the walls of the larger pores, so that the slurry crystals precipitate.
In addition, in S1.47, the slurry formed on the surface of the ceramic flat plate is dehydrated, thermally decomposed and recrystallized by placing the ceramic flat plate into a high-temperature kiln for sintering, and finally, a film layer with high mechanical strength is formed by sintering microcrystals.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A preparation method of a ceramic flat membrane coating based on a capillary impregnation method is characterized by comprising the following steps: the method comprises the following steps:
s1.1, placing the coating material, water and the fluxing agent in a ball mill stirrer according to the weight ratio of 1: 0.2 for mixing, controlling the stirring speed to be 200 and 250rpm, and stirring for 2-4 h;
s1.2, pouring the uniformly mixed slurry into a slurry tank;
s1.3, completely immersing the ceramic flat plate into the slurry in the slurry tank for 5-8 hours;
s1.4, taking out the ceramic flat plate and naturally airing;
s1.5, completely immersing the ceramic flat plate into the slurry in the slurry tank for 10-15 h;
s1.6, taking out the ceramic flat plate, heating and drying, and controlling the temperature at 30-35 ℃ until a forming film is formed on the surface of the ceramic flat plate;
s1.7, placing the mixture into a high-temperature kiln for sintering, wherein the sintering temperature is 1430-.
2. The method for preparing the ceramic flat membrane coating based on the capillary dipping method according to claim 1, wherein the method comprises the following steps: the coating material is alumina powder;
the preparation method of the alumina powder comprises the following steps: dissolving aluminum nitrate nonahydrate in ethanol to prepare an aluminum nitrate ethanol solution, adjusting the pH value to 2.8-3.0, adding citric acid, heating to 70 ℃ to enable the reaction to last for more than 7 hours until the reaction is complete, aging for 12 hours, and grinding the mixture into powder with the particle size of 5-8 mu m by using a ball mill.
3. The method for preparing the ceramic flat membrane coating based on the capillary dipping method according to claim 1, wherein the method comprises the following steps: the coating material is silicon oxide powder;
the preparation method of the silicon oxide powder comprises the following steps: adding absolute ethyl alcohol into a beaker, adding deionized water, stirring uniformly, adding tetraethoxysilane into the beaker, stirring simultaneously to form a silane solution, adjusting the pH value of the silane solution to 7 by using a 1:1 ammonia water solution, stirring for 10min, putting the silane solution into a water bath kettle, aging for 1h at the temperature of 35 ℃, dropwise adding concentrated ammonia water into the solution until just jelly-shaped gel is generated, standing until the solution is completely converted into gel, mashing the obtained gel and putting the mashed gel into an oven, wherein the oven temperature is 100 ℃, and drying.
4. The method for preparing the ceramic flat membrane coating based on the capillary dipping method according to claim 1, wherein the method comprises the following steps: the coating material is titanium dioxide powder;
the preparation method of the titanium dioxide powder comprises the steps of taking titanium alkoxide as a raw material, dissolving the titanium alkoxide in solvents such as ethanol, propanol and butanol to form a homogeneous solution, carrying out hydrolysis reaction on the titanium alkoxide at a level with uniform molecules, simultaneously carrying out polycondensation reaction of dehydration and alcohol loss, aggregating the resultant into particles to form sol, ageing to form gel of a three-dimensional network, drying to remove residual moisture, organic groups and organic solvents to obtain dry gel, and grinding and calcining to form the titanium dioxide powder.
5. The method for preparing the ceramic flat membrane coating based on the capillary dipping method according to claim 1, wherein the method comprises the following steps: the coating material is mullite powder.
6. The method for preparing the ceramic flat membrane coating based on the capillary dipping method according to claim 5, wherein the method comprises the following steps: the preparation method of the mullite powder comprises the following steps:
s2.1, grinding silicon oxide and aluminum oxide into powder, and mixing;
s2.2, pouring the mixed powder into a ball mill, adding absolute ethyl alcohol, and carrying out ball milling for 3 hours;
s2.3, putting the mixed powder after ball milling into an oven, and drying at 60 ℃;
s2.4, placing the dried mixture powder into a muffle furnace for sintering, wherein the sintering temperature is 1500 ℃, the temperature is kept for 2 hours, the heating rate is 10 ℃/min, and the cooling rate is 5 ℃/min;
s2.5, sieving the sintered powder by a 320-mesh sieve to prepare the mullite powder with the particle size of 0.7 mu m.
7. The method for preparing the ceramic flat membrane coating based on the capillary dipping method according to claim 1, wherein the method comprises the following steps: the fusion agent is dimethyl acetamide.
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