Film liquid for ink-jet printing and preparation method for forming film by spraying film liquid on ink-jet printer

Abstract

The invention relates to the technical field of ink-jet printing, and discloses a film liquid for ink-jet printing and a preparation method for forming a film by spraying the film liquid through an ink-jet printer, the film liquid meeting the requirement is uniformly sprayed on the surface of a flat sheet film through the ink-jet printer, and after drying and firing, a flat and uniform plate-type ceramic film with accurate thickness is obtained. Any accurately-positioned micron-to-millimeter-scale convex patterns can be prepared on the surface of the film through multiple times of spraying, and the convex patterns and the base film form a three-dimensional dot matrix film or a biomimetic film; double layers or multiple layers of multi-layer composite films with completely different properties can be sprayed; the required composite membranes with different three-dimensional properties or different three-dimensional structures can also be accurately controlled and sprayed through a computer, so that the design capability, the anti-pollution capability and the regeneration capability of the membranes are greatly improved, and membrane liquid is uniformly sprayed on the surface of a membrane support body through an ink-jet printer; a continuous, flat and smooth surface film with consistent thickness and controllable quality can be formed, and the quality and performance of the film are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of inkjet printing, in particular to a film liquid for inkjet printing and a method for preparing a film formed by spraying the film liquid by an inkjet printer. Background Art

[0002] With the continuous development of science and technology, the performance requirements for membrane materials are getting higher and higher. Traditional membrane preparation methods have certain limitations in terms of membrane uniformity, thickness control, surface flatness design and layout. At the same time, in order to meet the special needs of different fields, such as higher filtration accuracy, special three-dimensional structure, etc., new membrane preparation technologies need to be developed. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] In view of the deficiencies in the prior art, the present invention provides a membrane liquid for inkjet printing and a method for preparing a membrane formed by spraying the membrane liquid with an inkjet printer. The method has the advantages of spraying the membrane liquid evenly onto the surface of a membrane support through an inkjet printer to form a continuous, flat, smooth surface film with consistent thickness and controllable quality, thereby effectively improving the quality and performance of the membrane and solving the problems of uniformity and related limitations of the membrane.

[0005] (II) Technical solution

[0006] In order to achieve the above-mentioned purpose of uniformly spraying the membrane liquid on the surface of the membrane support through an inkjet printer to form a continuous, flat, smooth and uniform thickness and quality-controlled surface film, which effectively improves the quality and performance of the membrane, the present invention provides the following technical solutions: a membrane liquid for inkjet printing, comprising using the membrane liquid instead of ink to continuously and uniformly spray the membrane liquid on the surface of the membrane support through an inkjet printer to form a continuous, flat, smooth and uniform thickness surface film;

[0007] Take 15-50 (%) of film-forming aggregate, 0.1-3.0% of super dispersant, 80-50% of solvent and 0-3% of surfactant by weight, and use a sand mill, stirring mill or planetary mill to mix and grind the above-mentioned formulated materials to homogenize the main film aggregate D99 <1.0um, D50 = 0.05um~0.5um, D10 > 0.01um, dispersion <0.6 and form a uniform and stable film liquid.

[0008] Preferably, a method for preparing a film formed by spraying a film liquid with an inkjet printer for inkjet printing comprises the following steps:

[0009] S1: spraying the membrane liquid evenly onto the ceramic membrane support through an inkjet printer;

[0010] S2: drying the membrane surface sprayed with the membrane liquid, turning it over and spraying the other side of the support, and then drying and firing to obtain a finished membrane product;

[0011] S3: As needed, another membrane liquid (or the same membrane liquid) can be used to spray the second membrane or multi-layer membrane on the first membrane surface in the form of whole surface, lattice, grid, bionic and other required patterns, and then sintering and other heat treatments are performed to obtain a composite membrane or a special three-dimensional structure membrane.

[0012] Preferably, the membrane aggregate is one of inorganic raw materials such as Al2O3, ZrO2, SiO2, TiO2, SiC, Si3N4, mullite, cordierite, etc., or it can be hydrophobic membrane materials such as PVDF, Pcfe and hydrophilic membrane materials such as polydopamine. Its particle size D99 is required to be less than 1.0um before use.

[0013] Preferably, the hyperdispersant is a nonionic surfactant, and the hyperdispersant is a mixture of various nonionic surfactants.

[0014] Preferably, the solvent is: pure water, alcohols, ketones, esters and ether solvents, at least one of the solvents or a composite (mixed) solvent; the solvent can also be all ester or ether non-aqueous solvents, thereby forming a system membrane liquid with very stable symmetry, balance, and non-polar bond solvent.

[0015] Preferably, the surfactant is at least one or a combination of multiple of fluorocarbon surfactants, silane coupling agents, titanate coupling agents, stearic acid and salts, and fatty acid surfactants.

[0016] Preferably, when spraying the membrane liquid, the temperature is 20°C to 50°C, the distance between the nozzle and the support surface is 1.0 mm to 3.0 mm, the amount of membrane liquid sprayed is 20 g / ㎡·time to 150 g / ㎡·time, and the base film thickness is controlled at 4 um to 20 um.

[0017] Preferably, the drying is carried out at 40°C to 110°C; the sintering is carried out at 800°C to 1250°C, and the organic mask materials Pvdf and Pda do not require high-temperature heat treatment.

[0018] Preferably, the total film thickness is determined by the amount and number of spraying. The number of spraying is generally 1 to 6 times. The film thickness of each spraying can be adjusted between about 1.5um and 15um by controlling the amount of liquid sprayed, and the film thickness can be accurately controlled within ±1um; the total film thickness can be controlled by the number of spraying, and the maximum controlled thickness of the film sprayed multiple times is not more than 100um.

[0019] Preferably, the membrane material is a combination of inorganic and organic materials, for example, Aho3 is used as the base membrane material, and Pvdf is used as the surface membrane material, and they are formed into a grid or lattice shape.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention provides a membrane liquid for inkjet printing and a method for preparing a membrane formed by spraying the membrane liquid by an inkjet printer, which has the following beneficial effects:

[0022] 1. The membrane liquid for inkjet printing and the preparation method of the membrane liquid formed by an inkjet printer, wherein the membrane liquid is evenly sprayed on the surface of a membrane support by an inkjet printer, so as to form a continuous, flat, smooth surface film with uniform thickness and controllable thickness quality, thereby effectively improving the quality and performance of the membrane. At the same time, the scheme can achieve precise control: the formulated materials are mixed, ground and homogenized, and the particle size distribution of the main membrane aggregate in the membrane liquid can be precisely controlled to meet specific requirements, thereby ensuring the stable performance of the membrane and having high flexibility: different membrane liquids can be selected for multi-layer spraying as needed to prepare composite membranes or special three-dimensional structure membranes to meet the needs of different application scenarios.

[0023] 2. The membrane liquid for inkjet printing and the method for preparing the membrane formed by spraying the membrane liquid with an inkjet printer can realize automated and efficient preparation: the inkjet printing technology is used, the preparation process is relatively simple and efficient, the production efficiency can be improved, and the application range is wide: the preparation method is suitable for various membrane supports, and provides a new way for the preparation of membrane materials. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] The present invention provides a technical solution, specifically, a membrane liquid for inkjet printing, comprising using the membrane liquid instead of ink to continuously and evenly spray the membrane liquid on the surface of a membrane support body with an inkjet printer to form a continuous, smooth, and uniformly thick surface film;

[0026] Take 35% of film-forming aggregate (corundum powder / alumina powder, zirconium oxide powder, silicon carbide powder, silicon nitride powder) by weight, 0.5% of super dispersant (alkyl acid polyoxyethylene ether, sodium polycarboxylate), 65% of solvent (pure water, anhydrous ethanol, cyclohexanone, ethyl acetate, propylene glycol methyl ether), 1.5% of surfactant (silane coupling agent 171, magnesium stearate, oleic acid), and use a sand mill, a stirring mill or a planetary mill to mix and grind the above-mentioned materials into a main film aggregate with D99 ​​<1.0um, D50 = 0.05um~0.5um, D10>0.01um, a dispersion <0.6 and a uniform and stable film liquid;

[0027] A method for preparing a film formed by spraying a film liquid for inkjet printing by an inkjet printer, wherein the preparation process is prepared by the following steps:

[0028] S1: spraying the membrane liquid evenly onto the ceramic membrane support through an inkjet printer;

[0029] S2: drying the membrane surface sprayed with the membrane liquid, turning it over and spraying the other side of the support, and then drying and firing to obtain a finished membrane product;

[0030] S3: As needed, another membrane liquid (or the same membrane liquid) can be used to spray the second membrane or multi-layer membrane on the first membrane surface in the form of whole surface, lattice, grid, bionic and other required patterns, and then sintering and other heat treatments are performed to obtain a composite membrane or a special three-dimensional structure membrane.

[0031] Furthermore, the membrane aggregate is one of inorganic raw materials such as Al2O3, ZrO2, SiO2, TiO2, SiC, Si3N4, mullite, cordierite, etc., or it can be hydrophobic membrane materials such as Pvdf, Pcfe and hydrophilic membrane materials such as polydopamine. Its particle size D99 is required to be less than 1.0um before use.

[0032] Furthermore, the hyperdispersant is a nonionic surfactant, and the hyperdispersant is a mixture of various nonionic surfactants.

[0033] Furthermore, the solvents are: pure water, alcohols, ketones, esters and ether solvents, at least one of the solvents or a composite (mixed) solvent; the solvents can also be all ester or ether non-aqueous solvents, thereby forming a membrane liquid system with very stable symmetry, balance, and non-polar bond solvent.

[0034] Furthermore, the surfactant is at least one or a combination of multiple surfactants selected from fluorocarbon surfactants, silane coupling agents, titanate coupling agents, stearic acid and salts, and fatty acid surfactants.

[0035] Furthermore, when spraying the membrane liquid, the temperature is between 20°C and 50°C, the distance between the nozzle and the support surface is 1.0 mm to 3.0 mm, the amount of membrane liquid sprayed is 20 g / ㎡·time to 150 g / ㎡·time, and the base film thickness is controlled at 4 um to 20 um.

[0036] Furthermore, the drying is carried out at 40°C to 110°C; and the calcination is carried out at 800°C to 1250°C.

[0037] Furthermore, the total film thickness is determined by the amount and number of spraying. The number of spraying is generally 1 to 6 times. The film thickness of each spraying can be adjusted between about 1.5um and 15um by controlling the amount of spray liquid, and the film thickness can be accurately controlled within ±1um; the total film thickness can be controlled by the number of spraying, and the maximum thickness of the film after multiple spraying is controlled to be no more than 100um.

[0038] Furthermore, the membrane material can be an inorganic material or an organic material, such as PVDF, PTFE, PI, PA, PSF, PES, PDA, etc. For example, the base membrane material is Aho3, the surface membrane material is PVDF, and it is formed into a grid or lattice shape.

[0039] Furthermore, the bionic membrane is a shark skin structure printed by an inkjet printer.

[0040] Furthermore, by using an inkjet printer to evenly spray the membrane liquid onto the surface of the membrane support, a continuous, flat, smooth surface film with consistent thickness and controllable quality can be formed, which effectively improves the quality and performance of the membrane. At the same time, the solution can achieve precise control: the formulated materials are mixed, ground and homogenized, and the particle size distribution of the main membrane aggregate in the membrane liquid can be accurately controlled to meet specific requirements, thereby ensuring the stability of the membrane performance and high flexibility: different membrane liquids can be selected for multi-layer spraying as needed to prepare composite membranes or special three-dimensional structure membranes to meet the needs of different application scenarios.

[0041] Furthermore, the solution is highly efficient in preparation: using inkjet printing technology, the preparation process is relatively simple and efficient, can improve production efficiency, and has a wide range of applications: the preparation method is applicable to various membrane supports, providing a new approach to the preparation of membrane materials.

[0042] Embodiment 1:

[0043] A membrane liquid for inkjet printing, comprising using the membrane liquid instead of ink to continuously and evenly spray the membrane liquid on the surface of a membrane support body with an inkjet printer to form a continuous, smooth, and uniformly thick surface film;

[0044] Take 35% of film-forming aggregate (corundum powder / alumina powder, zirconium oxide powder, silicon carbide powder, silicon nitride powder) by weight, 0.5% of super dispersant (alkyl acid polyoxyethylene ether, sodium polycarboxylate), 65% of pure water as solvent, and 1.5% of surfactant (silane coupling agent 171, magnesium stearate, oleic acid) by weight, and use a sand mill, a stirring mill or a planetary mill to mix and grind the above-mentioned materials into a main film aggregate with D99 ​​<1.0um, D50 = 0.05um~0.5um, D10>0.01um, a dispersion <0.6 and a uniform and stable film liquid;

[0045] A method for preparing a film formed by spraying a film liquid for inkjet printing by an inkjet printer, wherein the preparation process is prepared by the following steps:

[0046] S1: spraying the membrane liquid evenly onto the ceramic membrane support through an inkjet printer;

[0047] S2: drying the membrane surface sprayed with the membrane liquid, turning it over and spraying the other side of the support, and then drying and firing to obtain a finished membrane product;

[0048] S3: As needed, another membrane liquid (or the same membrane liquid) can be used to spray the second membrane or multi-layer membrane on the first membrane surface in the form of whole surface, lattice, grid, bionic and other required patterns, and then sintering and other heat treatments are performed to obtain a composite membrane or a special three-dimensional structure membrane.

[0049] Furthermore, the membrane aggregate is one of inorganic raw materials such as Al2O3, ZrO2, SiO2, TiO2, SiC, Si3N4, mullite, cordierite, etc., or it can be hydrophobic membrane materials such as Pvdf, Pcfe and hydrophilic membrane materials such as polydopamine. Its particle size D99 is required to be less than 1.0um before use.

[0050] Furthermore, the hyperdispersant is a nonionic surfactant, and the hyperdispersant is a mixture of various nonionic surfactants.

[0051] Furthermore, the solvent is: pure water solvent, at least one solvent or a composite (mixed) solvent; the solvent can also be all ester or ether non-aqueous solvents, thereby forming a membrane liquid system with very stable symmetry, balance, and non-polar bond solvent.

[0052] Furthermore, the surfactant is at least one or a combination of multiple surfactants selected from fluorocarbon surfactants, silane coupling agents, titanate coupling agents, stearic acid and salts, and fatty acid surfactants.

[0053] Furthermore, when spraying the membrane liquid, the temperature is between 20°C and 50°C, the distance between the nozzle and the support surface is 1.0 mm to 3.0 mm, the amount of membrane liquid sprayed is 20 g / ㎡·time to 150 g / ㎡·time, and the base film thickness is controlled at 4 um to 20 um.

[0054] Furthermore, the drying is carried out at 40°C to 110°C; and the calcination is carried out at 800°C to 1250°C.

[0055] Furthermore, the total film thickness is determined by the amount and number of spraying. The number of spraying is generally 1 to 6 times. The film thickness of each spraying can be adjusted between about 1.5um and 15um by controlling the amount of spray liquid, and the film thickness can be accurately controlled within ±1um; the total film thickness can be controlled by the number of spraying, and the maximum thickness of the film after multiple spraying is controlled to be no more than 100um.

[0056] Furthermore, the membrane material can be an inorganic material or an organic material, for example: PVDF, PTFE, PI, PA, PSF, PES, PDA, etc.

[0057] Furthermore, the bionic membrane is a shark skin structure printed by an inkjet printer.

[0058] When the solvent of the inkjet membrane liquid is pure water, the ink is called aqueous inkjet ink. Aqueous inkjet inks usually contain no or low levels of volatile organic compounds (VOCs), so they have less impact on the environment and the health of operators. Aqueous inks can provide bright colors and are especially suitable for color printing.

[0059] Embodiment 2:

[0060] A membrane liquid for inkjet printing, comprising using the membrane liquid instead of ink to continuously and evenly spray the membrane liquid on the surface of a membrane support body with an inkjet printer to form a continuous, smooth, and uniformly thick surface film;

[0061] Take 35% of film-forming aggregate (corundum powder / alumina powder, zirconium oxide powder, silicon carbide powder, silicon nitride powder) by weight, 0.5% of super dispersant (alkyl acid polyoxyethylene ether, sodium polycarboxylate), 65% of anhydrous ethanol as solvent, and 1.5% of surfactant (silane coupling agent 171, magnesium stearate, oleic acid) by weight, and use a sand mill, a stirring mill or a planetary mill to mix and grind the above-mentioned materials into a main film aggregate with D99 ​​<1.0um, D50 = 0.05um~0.5um, D10>0.01um, a dispersion <0.6 and a uniform and stable film liquid;

[0062] A method for preparing a film formed by spraying a film liquid for inkjet printing by an inkjet printer, wherein the preparation process is prepared by the following steps:

[0063] S1: spraying the membrane liquid evenly onto the ceramic membrane support through an inkjet printer;

[0064] S2: drying the membrane surface sprayed with the membrane liquid, turning it over and spraying the other side of the support, and then drying and firing to obtain a finished membrane product;

[0065] S3: As needed, another membrane liquid (or the same membrane liquid) can be used to spray the second membrane or multi-layer membrane on the first membrane surface in the form of whole surface, lattice, grid, bionic and other required patterns, and then sintering and other heat treatments are performed to obtain a composite membrane or a special three-dimensional structure membrane.

[0066] Furthermore, the membrane aggregate is one of inorganic raw materials such as Al2O3, ZrO2, SiO2, TiO2, SiC, Si3N4, mullite, cordierite, etc., or it can be hydrophobic membrane materials such as Pvdf, Pcfe and hydrophilic membrane materials such as polydopamine. Its particle size D99 is required to be less than 1.0um before use.

[0067] Furthermore, the hyperdispersant is a nonionic surfactant, and the hyperdispersant is a mixture of various nonionic surfactants.

[0068] Furthermore, the solvent is: an alcohol solvent, at least one of the solvents is used or it is a composite (mixed) solvent; the solvent can also be all ester or ether non-aqueous solvents, thereby forming a membrane liquid system with very stable symmetry, balance, and non-polar bond solvent.

[0069] Furthermore, the surfactant is at least one or a combination of multiple surfactants selected from fluorocarbon surfactants, silane coupling agents, titanate coupling agents, stearic acid and salts, and fatty acid surfactants.

[0070] Furthermore, when spraying the membrane liquid, the temperature is between 20°C and 50°C, the distance between the nozzle and the support surface is 1.0 mm to 3.0 mm, the amount of membrane liquid sprayed is 20 g / ㎡·time to 150 g / ㎡·time, and the base film thickness is controlled at 4 um to 20 um.

[0071] Furthermore, the drying is carried out at 40°C to 110°C; and the calcination is carried out at 800°C to 1250°C.

[0072] Furthermore, the total film thickness is determined by the amount and number of spraying. The number of spraying is generally 1 to 6 times. The film thickness of each spraying can be adjusted between about 1.5um and 15um by controlling the amount of spray liquid, and the film thickness can be accurately controlled within ±1um; the total film thickness can be controlled by the number of spraying, and the maximum thickness of the film after multiple spraying is controlled to be no more than 100um.

[0073] Furthermore, the membrane material can be an inorganic material or an organic material, for example: PVDF, PTFE, PI, PA, PSF, PES, PDA, etc.

[0074] Furthermore, the bionic membrane is a shark skin structure printed by an inkjet printer.

[0075] When the solvent of the membrane liquid is anhydrous ethanol, this inkjet ink is usually called alcohol-soluble inkjet ink. Anhydrous ethanol evaporates faster than water, so alcohol-soluble ink can dry quickly after printing and is suitable for applications that require fast drying. Alcohol-soluble ink has better adhesion on many non-absorbent or special material surfaces (such as plastics, metals, glass, etc.).

[0076] Embodiment three:

[0077] A membrane liquid for inkjet printing, comprising using the membrane liquid instead of ink to continuously and evenly spray the membrane liquid on the surface of a membrane support body with an inkjet printer to form a continuous, smooth, and uniformly thick surface film;

[0078] Take 35% of film-forming aggregate (corundum powder / alumina powder, zirconium oxide powder, silicon carbide powder, silicon nitride powder) by weight, 0.5% of super dispersant (alkyl acid polyoxyethylene ether, sodium polycarboxylate), 65% of solvent cyclohexanone, 1.5% of surfactant (silane coupling agent 171, magnesium stearate, oleic acid), and use a sand mill, stirring mill or planetary mill to mix and grind the above-mentioned materials into a main film aggregate with D99 ​​<1.0um, D50 = 0.05um~0.5um, D10>0.01um, dispersion <0.6 and uniform and stable film liquid;

[0079] A method for preparing a film formed by spraying a film liquid for inkjet printing by an inkjet printer, wherein the preparation process is prepared by the following steps:

[0080] S1: spraying the membrane liquid evenly onto the ceramic membrane support through an inkjet printer;

[0081] S2: drying the membrane surface sprayed with the membrane liquid, turning it over and spraying the other side of the support, and then drying and firing to obtain a finished membrane product;

[0082] S3: As needed, another membrane liquid (or the same membrane liquid) can be used to spray the second membrane or multi-layer membrane on the first membrane surface in the form of whole surface, lattice, grid, bionic and other required patterns, and then sintering and other heat treatments are performed to obtain a composite membrane or a special three-dimensional structure membrane.

[0083] Furthermore, the membrane aggregate is one of inorganic raw materials such as Al2O3, ZrO2, SiO2, TiO2, SiC, Si3N4, mullite, cordierite, etc., or it can be hydrophobic membrane materials such as Pvdf, Pcfe and hydrophilic membrane materials such as polydopamine. Its particle size D99 is required to be less than 1.0um before use.

[0084] Furthermore, the hyperdispersant is a nonionic surfactant, and the hyperdispersant is a mixture of various nonionic surfactants.

[0085] Furthermore, the solvent is: a ketone solvent, at least one of the solvents is used or it is a composite (mixed) solvent; the solvent can also be all ester or ether non-aqueous solvents, thereby forming a membrane liquid system with very stable symmetry, balance, and non-polar bond solvent.

[0086] Furthermore, the surfactant is at least one or a combination of multiple surfactants selected from fluorocarbon surfactants, silane coupling agents, titanate coupling agents, stearic acid and salts, and fatty acid surfactants.

[0087] Furthermore, when spraying the membrane liquid, the temperature is between 20°C and 50°C, the distance between the nozzle and the support surface is 1.0 mm to 3.0 mm, the amount of membrane liquid sprayed is 20 g / ㎡·time to 150 g / ㎡·time, and the base film thickness is controlled at 4 um to 20 um.

[0088] Furthermore, the drying is carried out at 40°C to 110°C; and the calcination is carried out at 800°C to 1250°C.

[0089] Furthermore, the total film thickness is determined by the amount and number of spraying. The number of spraying is generally 1 to 6 times. The film thickness of each spraying can be adjusted between about 1.5um and 15um by controlling the amount of spray liquid, and the film thickness can be accurately controlled within ±1um; the total film thickness can be controlled by the number of spraying, and the maximum thickness of the film after multiple spraying is controlled to be no more than 100um.

[0090] Furthermore, the membrane material can be an inorganic material or an organic material, for example: PVDF, PTFE, PI, PA, PSF, PES, PDA, etc.

[0091] Furthermore, the bionic membrane is a shark skin structure printed by an inkjet printer.

[0092] When cyclohexanone is used as the membrane liquid solvent, cyclohexanone as a solvent in the inkjet membrane liquid can help dissolve the membrane material and improve the film-forming effect. It is suitable for some occasions that require fast drying and high solubility.

[0093] Embodiment 4:

[0094] A membrane liquid for inkjet printing, comprising using the membrane liquid instead of ink to continuously and evenly spray the membrane liquid on the surface of a membrane support body with an inkjet printer to form a continuous, smooth, and uniformly thick surface film;

[0095] Take 35% of film-forming aggregate (corundum powder / alumina powder, zirconium oxide powder, silicon carbide powder, silicon nitride powder) by weight, 0.5% of super dispersant (alkyl acid polyoxyethylene ether, sodium polycarboxylate), 65% of solvent (ethyl acetate and propylene glycol methyl ether), 1.5% of surfactant (silane coupling agent 171, magnesium stearate, oleic acid) by weight, and use a sand mill, a stirring mill or a planetary mill to mix and grind the above-mentioned materials into a main film aggregate with D99 ​​<1.0um, D50 = 0.05um~0.5um, D10>0.01um, a dispersion <0.6 and a uniform and stable film liquid;

[0096] A method for preparing a film formed by spraying a film liquid for inkjet printing by an inkjet printer, wherein the preparation process is prepared by the following steps:

[0097] S1: spraying the membrane liquid evenly onto the ceramic membrane support through an inkjet printer;

[0098] S2: drying the membrane surface sprayed with the membrane liquid, turning it over and spraying the other side of the support, and then drying and firing to obtain a finished membrane product;

[0099] S3: As needed, another membrane liquid (or the same membrane liquid) can be used to spray the second membrane or multi-layer membrane on the first membrane surface in the form of whole surface, lattice, grid, bionic and other required patterns, and then sintering and other heat treatments are performed to obtain a composite membrane or a special three-dimensional structure membrane.

[0100] Furthermore, the membrane aggregate is one of inorganic raw materials such as Al2O3, ZrO2, SiO2, TiO2, SiC, Si3N4, mullite, cordierite, etc., or it can be hydrophobic membrane materials such as Pvdf, Pcfe and hydrophilic membrane materials such as polydopamine. Its particle size D99 is required to be less than 1.0um before use.

[0101] Furthermore, the hyperdispersant is a nonionic surfactant, and the hyperdispersant is a mixture of various nonionic surfactants.

[0102] Furthermore, the solvent is: an ester and an ether solvent, at least one of the solvents is used or a composite (mixed) solvent is used; the solvent can also be all ester or ether non-aqueous solvents, thereby forming a membrane liquid system with very stable symmetry, balance, and non-polar bond solvent.

[0103] Furthermore, the surfactant is at least one or a combination of multiple surfactants selected from fluorocarbon surfactants, silane coupling agents, titanate coupling agents, stearic acid and salts, and fatty acid surfactants.

[0104] Furthermore, when spraying the membrane liquid, the temperature is between 20°C and 50°C, the distance between the nozzle and the support surface is 1.0 mm to 3.0 mm, the amount of membrane liquid sprayed is 20 g / ㎡·time to 150 g / ㎡·time, and the base film thickness is controlled at 4 um to 20 um.

[0105] Furthermore, the drying is carried out at 40°C to 110°C; and the calcination is carried out at 800°C to 1250°C.

[0106] Furthermore, the total film thickness is determined by the amount and number of spraying. The number of spraying is generally 1 to 6 times. The film thickness of each spraying can be adjusted between about 1.5um and 15um by controlling the amount of spray liquid, and the film thickness can be accurately controlled within ±1um; the total film thickness can be controlled by the number of spraying, and the maximum thickness of the film after multiple spraying is controlled to be no more than 100um.

[0107] Furthermore, the membrane material can be an inorganic material or an organic material, for example: PVDF, PTFE, PI, PA, PSF, PES, PDA, etc.

[0108] Furthermore, the bionic membrane is a shark skin structure printed by an inkjet printer.

[0109] When the solvent of the inkjet film liquid is ethyl acetate and propylene glycol methyl ether, this inkjet ink is usually called solvent-based inkjet ink. Ethyl acetate and propylene glycol methyl ether are volatile organic solvents that evaporate quickly, so the ink can dry quickly after printing. Images printed on non-absorbent materials usually have high light resistance and weather resistance and are suitable for outdoor use.

[0110] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A membrane liquid for inkjet printing, characterized in that: The method comprises using a membrane liquid instead of ink to continuously and evenly spray the membrane liquid onto the surface of the membrane support body by using an inkjet printer to form a continuous, smooth, and uniformly thick surface membrane; Take 20-50% of film-forming aggregate, 0.1-3.0% of super dispersant, 80-50% of solvent and 0-3% of surfactant by weight, and use a sand mill, stirring mill or planetary mill to mix and grind the above-mentioned materials into a uniform and stable film liquid with a main film aggregate D99 <1.0um, D50 = 0.05um~0.5um, D10 > 0.01um, a dispersion <0.

6.

2. A film liquid for inkjet printing and a method for preparing a film formed by spraying the film liquid by an inkjet printer, characterized in that: The preparation process comprises the following steps: S1: spraying the membrane liquid evenly onto the ceramic membrane support through an inkjet printer; S2: drying the membrane surface sprayed with the membrane liquid, turning it over and spraying the other side of the support, and then drying and firing to obtain a finished membrane product; S3: As needed, another membrane liquid (or the same membrane liquid) can be used to spray the second membrane or multi-layer membrane on the first membrane surface in the form of whole surface, lattice, grid, bionic and other required patterns, and then sintering and other heat treatments are performed to obtain a composite membrane or a special three-dimensional structure membrane.

3. The method for preparing a film liquid for inkjet printing and a film-forming method of a film formed by spraying the film liquid by an inkjet printer according to claim 1, characterized in that: The membrane aggregate is one of inorganic raw materials such as Al2O3, ZrO2, SiO2, TiO2, SiC, Si3N4, mullite, cordierite, etc., and can also be hydrophobic membrane materials such as PVDF, Pcfe and hydrophilic membrane materials such as polydopamine. Its particle size D99 is required to be less than 1.0um before use.

4. The method for preparing a film liquid for inkjet printing and a film-forming method of a film by an inkjet printer using the film liquid as claimed in claim 1, characterized in that: The hyperdispersant is a nonionic surfactant or a mixture of multiple nonionic surfactants.

5. The method for preparing a film liquid for inkjet printing and a film-forming method of a film formed by spraying the film liquid by an inkjet printer according to claim 1, characterized in that: The solvents are: pure water, alcohols, ketones, esters and ethers, at least one of which may be a composite (mixed) solvent; the solvents may also all be esters or ethers non-aqueous solvents, thereby forming a system membrane liquid with very stable symmetry, balance and no polar bond solvent.

6. The method for preparing a film liquid for inkjet printing and a film-forming method of a film formed by spraying the film liquid by an inkjet printer according to claim 1, characterized in that: The surfactant is at least one of fluorocarbon surfactant, silane coupling agent, titanate coupling agent, stearic acid and salts and fatty acid surfactants, or a combination of multiple surfactants.

7. The method for preparing a film liquid for inkjet printing and a film-forming method of a film formed by spraying the film liquid by an inkjet printer according to claim 2, characterized in that: When spraying the membrane liquid, the temperature is 20°C to 50°C, the distance between the nozzle and the support surface is 1.0mm to 3.0mm, the amount of membrane liquid sprayed is 20g / ㎡·time to 150g / ㎡·time, and the base film thickness is controlled at 4um to 20um.

8. The method for preparing a film liquid for inkjet printing and a film-forming method of a film formed by spraying the film liquid by an inkjet printer according to claim 2, characterized in that: The drying is carried out at a temperature between 40°C and 110°C; and the sintering is carried out at a temperature between 800°C and 1250°C.

9. The method for preparing a film liquid for inkjet printing and a film-forming method of a film formed by spraying the film liquid by an inkjet printer according to claim 2, characterized in that: The total film thickness is determined by the amount and number of spraying. The number of spraying is generally 1 to 6 times. The film thickness of each spraying can be adjusted between about 1.5um and 15um by controlling the amount of liquid sprayed, and the film thickness can be accurately controlled within ±1um; the total film thickness can be controlled by the number of spraying, and the maximum thickness of the film after multiple spraying is controlled to be no more than 100um.

10. The method for preparing a film liquid for inkjet printing and a film-forming method of a film formed by spraying the film liquid by an inkjet printer according to claims 1-3, characterized in that: The membrane material is inorganic material and organic material used simultaneously, for example, Aho3 is used as the base membrane material, and Pvdf is used as the surface membrane material, and they are formed into a grid shape or a lattice shape.