A screening vibration membrane with a piezoelectric ceramic array structure as a support and a preparation method thereof

Abstract

The present invention relates to a method for preparing a screening vibration membrane with a piezoelectric ceramic array structure as a support. The preparation process is as follows: an Al2O3 thin film is prepared by a tape casting process as a separation transition layer; the Al2O3 base film is compounded with a thermoplastic mold by a polymer binder; a piezoelectric ceramic array structure is prepared by a gel injection molding process, and demoulding is performed at a suitable temperature to obtain a piezoelectric array ceramic / Al2O3 composite green body; the obtained composite green body is placed in a high-temperature furnace for calcination and subjected to high-voltage polarization to obtain a piezoelectric composite screening vibration membrane. Compared with traditional asymmetric piezoelectric composite membranes, the pore size of the composite vibration screening membrane prepared by the present invention can be regulated by a narrow pore gradient at 1-1000nm to meet the high separation accuracy requirements of different separation systems; the permeation resistance is concentrated in the ultra-thin separation layer, which has a higher permeation flux; and under the action of the electric field, the synergistic effect between the piezoelectric arrays further improves the self-cleaning performance.

Description

Technical Field

[0001] The present invention relates to a method for preparing a screening vibration membrane with a piezoelectric array structure as a support body, and in particular to the controllable construction of the piezoelectric array structure. Background Art

[0002] Membrane separation technology uses a selectively permeable membrane as the separation medium. By applying a certain driving force on both sides of the membrane, the components on the raw material side selectively pass through the membrane to achieve the purpose of separation and purification. It has the advantages of no phase change, low energy consumption, high efficiency, and simple process. In addition, ceramic membranes are resistant to acid and alkali corrosion, organic solvents, high temperature and high pressure, etc., so they have very broad application prospects. Membrane fouling is a common problem faced by membrane separation technology in practical applications. Pollutants will accumulate on the membrane surface or in the membrane pores, causing membrane fouling. Not only will the membrane filtration flux be severely attenuated, but it may also affect the membrane's retention performance for the separated substances, directly affecting the economy and reliability of the membrane separation process.

[0003] Porous piezoelectric ceramic membranes with self-cleaning properties have been prepared. During the membrane separation process, applying an AC voltage across the membrane effectively removes contaminants accumulated on the membrane surface and within the pores, alleviating concentration polarization. This has been demonstrated in systems such as oil-water emulsions and protein purification. However, the permeation separation efficiency of piezoelectric ceramic membranes is low, making it difficult to simultaneously improve permeability while enhancing anti-fouling properties.

[0004] Currently, efforts to improve the self-cleaning and permeability properties of piezoelectric ceramics include the work of Mao et al. (J. Eur. Ceram. Soc. 2020, 40: 3632-3641), who fabricated a PZT piezoelectric membrane with both high flux and high piezoelectric performance through secondary sintering. To enhance the separation accuracy of the PZT membrane, an Al₂O₃ separation layer was constructed on the piezoelectric membrane surface. The PZT piezoelectric microfiltration membrane demonstrated high normalized flux and high retention in an oil-water separation system. Summary of the Invention

[0005] The technical problem to be solved by the present invention is the problem of low permeation efficiency of piezoelectric ceramic separation membranes. The inventive point of the present invention is to provide a method for preparing a piezoelectric array vibration screening membrane in which the separation layer and the piezoelectric layer act independently. The piezoelectric array vibration screening membrane prepared by this method has lower permeation resistance, higher separation efficiency and stronger piezoelectric response signal. The preparation method of the screening vibration membrane with a piezoelectric ceramic array structure as a support body combines the tape casting and gel injection molding processes, and uses thermoplastic materials as templates to prepare piezoelectric ceramic array columns.

[0006] A screening vibration membrane with a piezoelectric ceramic array structure as a support body includes a selective separation layer, a base membrane and a support body. The selective separation layer and the support body are respectively located on both sides of the base membrane. The base membrane is a porous ceramic sheet layer, and the support body is a piezoelectric ceramic block array located on one side of the support body. The spacing between the piezoelectric ceramic blocks in the array is 0.1-5mm, and the projected area of ​​the piezoelectric ceramic blocks on the selective separation layer is 0.5-5mm. 2 .

[0007] The base film has a thickness of 100-2000 μm, is made of porous ceramic, and has a pore size range of 0.01-5 μm.

[0008] The selective separation layer has a thickness of 1-50 μm, is made of porous ceramic, and has a pore size range of 1-1000 nm.

[0009] The piezoelectric ceramic material in the piezoelectric ceramic block is one of lead zirconate titanate (PZT), potassium sodium niobate (KNN), and barium titanate (BaTiO3).

[0010] The method for preparing the sieve vibration membrane using the piezoelectric ceramic array structure as a support body comprises the following steps:

[0011] Step 1: One side of the base film is fixed to a mold, wherein the mold has openings matching the shape of the piezoelectric ceramic block array;

[0012] Step 2: adding a slurry containing piezoelectric ceramic powder into the opening, demolding the slurry after curing, and sintering the slurry to obtain a piezoelectric ceramic block array;

[0013] Step 3: applying a sol or a membrane-forming liquid to the other side of the base film, and sintering to obtain a selective separation layer;

[0014] Step 4: polarize the piezoelectric ceramic block array.

[0015] In step 1, the base film and the mold are fixed by a polymer binder, and the polymer binder can be one of polyvinyl alcohol (PVA), polyethylene glycol (PEG) and polyvinylidene fluoride (PVDF).

[0016] In step 2, the slurry contains piezoelectric ceramic powder, a dispersant, and a cross-linking agent; the solid content of the slurry is 50-80wt%; the organic monomer for the cross-linking reaction is polyvinyl alcohol; the solvent is water; the cross-linking agent is 2,5-dimethoxydihydrofuran; and the dispersant is N,N-bis(2-hydroxyethyl)glycine.

[0017] In step 2, the weight ratio of the organic monomer to the cross-linking agent is 10-100:1, and the mass ratio of the dispersant to the piezoelectric ceramic powder is 1-5:100.

[0018] The curing treatment is carried out by cross-linking at 60-120°C for 0.5-5h.

[0019] The mold material can be one of polypropylene (PP), polyethylene (PE), and polytetrafluoroethylene (PTFE). The demoulding process refers to raising the temperature to 160~450℃, and the mold itself pyrolyzes into liquid or gas.

[0020] In step 2, the sintering temperature is 1100~1500℃.

[0021] In step 2, the particles in the sol or film-forming solution can be one of Al2O3, ZrO2 and TiO2, and the coating time is controlled within 30 to 300 seconds.

[0022] In step 4, the polarization electric field strength is 1-10 kV / mm; the polarization temperature is 60-140° C.; and the polarization time is 0.5-2 h.

[0023] Application of the above-mentioned screening vibrating membrane in liquid filtration.

[0024] During application, the screening vibration membrane is sealed in the component, and the component also includes a sealing unit and an outer tube arranged outside the base membrane and the support body, and the outer tube is arranged outside the sealing unit.

[0025] The sealing unit includes a rubber gasket, a fixing ring 1, a fixing ring 2 and an inner tube. The rubber gasket is arranged at the lower end of the outer ring support body, the fixing ring 1 is arranged on the outer wall of the lower end of the inner tube, the fixing ring 2 is arranged below the rubber gasket, and a fastening mechanism is provided between the fixing ring 1 and the fixing ring 1.

[0026] The fastening mechanism includes two symmetrically distributed thread grooves and fastening bolts opened on the wall of the fixing ring. The thread grooves are threaded with fastening bolts, and the lower ends of the fastening bolts are rotatably connected to the fixing ring.

[0027] An internal thread is provided on the outer wall of the inner tube, and an external thread matching the internal thread is provided on the inner wall of the outer tube, and the internal thread is threadably connected to the external thread. Beneficial effects

[0028] (1) Replacing the porous piezoelectric support with a piezoelectric array ceramic can significantly reduce the permeation resistance of the piezoelectric membrane and increase the permeation flux;

[0029] (2) Piezoelectric array ceramics can form gaps between each other, which constitute a rapid outflow channel for the permeate. At the same time, the piezoelectric array itself can serve as a support body to maintain the mechanical support force of the separation layer during operation;

[0030] (3) At the same time, through the synergistic effect between the piezoelectric array ceramics, the in-situ ultrasonic signal is further amplified and the self-cleaning performance is improved. Therefore, the preparation of the piezoelectric array screening vibration membrane is of great significance;

[0031] (4) The dimensional parameters of the prepared piezoelectric array columns can be adjusted according to the mold;

[0032] (5) The piezoelectric ceramic array unit provides strength for the composite screening membrane;

[0033] (6) According to the actual separation system, a narrow pore separation membrane can be constructed on the base membrane to improve the separation accuracy;

[0034] (7) Compared with the traditional arrangement of setting the sealing ring on the side wall of the base membrane, which will cause a horizontal force to be applied to the support body at the lower end of the base membrane when the base membrane is used, thereby easily causing the support body to break and separate from the base membrane, the fixing ring 1, the fixing ring 2 and the rubber gasket in the sealing unit of the present application apply a vertical force to the base membrane and the support body, which not only increases the sealing performance of the piezoelectric membrane, but also increases the tightness between the support body and the base membrane, thereby increasing the stability of the filter membrane and the effect of the piezoelectric membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 :Simplified diagram of the preparation of piezoelectric array composite sieving membrane;

[0036] Figure 2 : piezoelectric signal of piezoelectric composite sieve membrane detected by hydrophone;

[0037] Figure 3 : Pure water permeability of piezoelectric array composite sieving membrane varies with pressure;

[0038] Figure 4 : Schematic diagram of the cross-sectional front view of the base membrane, support body, outer tube, rubber gasket and sealing unit;

[0039] Figure 5 : Schematic diagram of the structure of base membrane, support body, rubber gasket and sealing unit;

[0040] Figure 6 : Schematic diagram of the external structure of the inner tube and the outer tube;

[0041] In the figure: 1 base membrane; 2, support body; 3, sealing unit; 31, rubber gasket; 32, fixing ring 1; 33, fixing ring 2; 34, inner tube; 35, fastening mechanism; 351, thread groove; 352, fastening bolt; 4, outer tube; 5, internal thread; 6, external thread. DETAILED DESCRIPTION

[0042] The preparation process of the screening vibrating membrane of the present invention is described in detail as follows:

[0043] The method comprises the following steps:

[0044] 1) An Al2O3-based membrane with a pore size of 1 μm and a thickness of 500 μm was prepared by a tape casting process. A polymer binder was coated on the Al2O3-based membrane. The Al2O3-based membrane was then composited with thermoplastic molds of different shapes through the action of bonding forces.

[0045] 2) Using piezoelectric ceramic powder as raw material, controlling the amount of organic monomer, dispersant, and cross-linking agent added to obtain a ceramic slurry with good dispersion and high solid content;

[0046] 3) Injecting the piezoelectric ceramic slurry into the Al2O3 composite mold, adjusting the amount of slurry added, cross-linking and curing at a certain temperature, and drying and forming;

[0047] 4) Raising the temperature to demold the dried piezoelectric green body, the mold, and the base film to obtain a piezoelectric ceramic / Al2O3 composite green body, and controlling the temperature to sinter the grains inside the piezoelectric array ceramic to make them dense;

[0048] 5) The sintered piezoelectric ceramic composite membrane is placed in a uniformly dispersed sol / membrane solution, and then dried and calcined to prepare a high-precision screening membrane;

[0049] 6) Placing the high-precision piezoelectric composite screening membrane in insulating oil and controlling the polarization conditions to impart piezoelectric properties to the high-precision piezoelectric composite screening membrane.

[0050] The thermoplastic mold material can be one of polypropylene (PP), polyethylene (PE), and polytetrafluoroethylene (PTFE); the mold shape can be one of (a) a single cylinder with a diameter of 3 cm, (b) an array of cylinders with a diameter of 1 mm and a spacing of 2 mm, and (c) an array of cylinders with a diameter of 2 mm and a spacing of 2 mm.

[0051] The polymer binder may be one of polyvinyl alcohol (PVA), polyethylene glycol (PEG) and polyvinylidene fluoride (PVDF).

[0052] The piezoelectric ceramic powder can be one of lead zirconate titanate (PZT), potassium sodium niobate (KNN), and barium titanate (BaTiO3); the solid content of the piezoelectric ceramic slurry is 50-80wt%.

[0053] The cross-linking reaction organic monomer is polyvinyl alcohol; the solvent is water; the cross-linking agent is 2,5-dimethoxydihydrofuran; the dispersant is N,N-bis(2-hydroxyethyl)glycine; and the mixing method is magnetic stirring.

[0054] The weight ratio of the organic monomer to the crosslinking agent is 10-100:1, and the mass ratio of the dispersant to the piezoelectric powder is 1-5:100; crosslinking curing refers to crosslinking at 60-120°C for 0.5-5 hours; drying molding is to dry naturally for 12-48 hours and then dry at 70-110°C for 1-24 hours;

[0055] The demoulding process is to raise the temperature to 160-450°C, and the mold will be pyrolyzed into liquid or gas.

[0056] The piezoelectric ceramic / Al2O3 composite green body has a calcination temperature of 1100-1500°C, a polarization electric field strength of 1-10 kV / mm, a polarization temperature of 60-140°C, and a polarization time of 0.5-2 h.

[0057] The particles of the sol / film-forming liquid can be one of Al2O3, ZrO2 and TiO2, and the coating time is controlled within 30~300s.

[0058] Example 1 Preparation method of a sieve vibration membrane using a KNN piezoelectric ceramic array structure as a support

[0059] An Al2O3-based membrane with a pore size of 1 μm was composited with polypropylene molds of various shapes using a polymer binder, PVA. The piezoelectric array ceramic support was fabricated via gel casting using KNN powder as the raw material, polyvinyl alcohol as the organic monomer, 2,5-dimethoxydihydrofuran as the crosslinker, and N,N-bis(2-hydroxyethyl)glycine as the dispersant.

[0060] The organic monomer polyvinyl alcohol (PVA) was dissolved in HNO₃ (pH 0.5) to prepare a 5wt% PVA premix. 30g of this premix was then added to 100g of KNN powder (average particle size 500nm) and 3g of N,N-bis(2-hydroxyethyl)glycine. The mixture was then mixed thoroughly. 0.06g of 2,5-dimethoxydihydrofuran (the mass ratio of organic monomer to crosslinker was 25:1) and 0.006g of n-butanol were then added and mixed again. The mixture was then injected into Al₂O₃-based film-coated polypropylene array molds (b) and (c) and sealed (the mold shapes can be: (b) 1mm diameter, 2mm spacing cylindrical array; (c) 2mm diameter, 2mm spacing cylindrical array). The molds were placed in an 80°C oven for 60 minutes, removed, air-dried for 12 hours, then placed in a 110°C oven for 8 hours, removed, air-dried, and demolded in a 200°C oven. The resulting KNN / Al₂O₃ composite array green body was obtained. The composite membrane was then calcined in a high-temperature furnace at 1100°C to obtain a piezoelectric array vibration screening composite membrane. The composite membrane was polarized in mineral oil at 130°C with a polarization voltage of 4 kV / mm and a polarization time of 30 min. The piezoelectric response signals detected by the composite membrane under 20 V AC excitation were 50 mV and 44 mV, respectively. Figure 2 As shown; the permeability is 20 m 3 ·m -2 ·h -1 bar -1 and 18 m 3 ·m-2 ·h -1 bar -1 ,like Figure 3 shown.

[0061] Example 2 Preparation method of sieving composite membrane using KNN piezoelectric porous structure as support

[0062] The piezoelectric ceramic slurry obtained in Example 1 was injected into a polypropylene mold (a) composited with an Al2O3-based membrane (the mold shape can be a single cylindrical shape with a diameter of 3 cm in (a). The crosslinking, drying, and demolding processes were the same as in Example 1 to obtain a KNN / Al2O3 composite green body. The green body was then calcined in a high-temperature furnace at 1000°C to obtain a piezoelectric porous vibration screening membrane. The polarization conditions were the same as in Example 1. The piezoelectric response signal detected by the piezoelectric porous composite membrane under 20V AC voltage excitation was 20 mV, as shown in Figure 2. Figure 2 As shown, the permeability is 165 L·m -2 ·h -1 bar -1 ,like Figure 3 shown.

[0063] Example 3 High-precision pore size gradient control method for KNN / Al2O3 piezoelectric composite membrane

[0064] The KNN / Al2O3 piezoelectric composite membranes obtained in Examples 1 and 2 were placed in an Al2O3 membrane-forming solution for 100 seconds and then calcined at high temperature to obtain a piezoelectric composite microfiltration membrane. To further improve separation accuracy, the microfiltration membrane was coated in an Al2O3 sol for 100 seconds and then calcined to obtain a piezoelectric composite ultrafiltration membrane. The microfiltration membrane / ultrafiltration membrane was placed in insulating oil for high-voltage polarization under the same polarization conditions as in Example 1. The piezoelectric response signals detected by the piezoelectric array composite membrane under 20 V AC excitation were 21 mV and 18 mV, respectively, and the permeabilities were 3.2 m 3 ·m -2 ·h -1 bar -1 and 0.8 m 3 ·m -2 ·h -1 bar -1 , and the average pore diameters are around 100 nm and 10 nm, respectively.

[0065] Example 4 Preparation method of a sieve vibration membrane using a BaTiO3 piezoelectric ceramic array structure as a support

[0066] An Al2O3-based membrane with a pore size of 1 μm was composited with polypropylene molds of various shapes using a polymer binder, PVA. The piezoelectric array ceramic support was fabricated via gel casting using BaTiO3 powder as the raw material, polyvinyl alcohol as the organic monomer, 2,5-dimethoxydihydrofuran as the crosslinker, and N,N-bis(2-hydroxyethyl)glycine as the dispersant.

[0067] The organic monomer polyvinyl alcohol (PVA) was dissolved in HNO₃ at pH 0.5 to prepare a 5 wt% PVA premix. 30 g of the premix was added to 100 g of BaTiO₃ powder (average particle size 500 nm) and 3 g of N,N-bis(2-hydroxyethyl)glycine, mixed evenly, and then 0.06 g of 2,5-dimethoxydihydrofuran (organic monomer to crosslinker mass ratio of 25:1) and 0.006 g of n-butanol were added and mixed again. The mixture was then injected into Al₂O₃-based film-laminated polypropylene array molds (b) and (c) and sealed (the mold shapes can be (b) 1 mm diameter, 2 mm spacing array cylindrical, (c) 2 mm diameter, 2 mm spacing array cylindrical). The mixture was placed in an 80°C oven for 60 min, removed, air-dried for 12 h, placed in a 110°C oven for 8 h, removed, air-dried, and demolded in a 200°C oven. The resulting BaTiO3 / Al2O3 composite array green body was then calcined in a high-temperature furnace at 1400°C to obtain a piezoelectric array vibration screening composite membrane. The composite membrane was polarized in mineral oil at 120°C with a polarization voltage of 3 kV / mm and a polarization time of 60 min. The piezoelectric response signals detected by the piezoelectric array composite membrane under 20 V AC excitation were 150 mV and 139 mV, respectively, and the permeabilities were 2.2 m 3 ·m -2 ·h -1 bar -1 and 1.8 m 3 ·m -2 ·h -1 bar -1 .

[0068] The application of the above-mentioned screening vibration membrane in liquid filtration also includes a sealing unit 3 and an outer tube 4 arranged outside the base membrane 1 and the support body 2. The outer tube 4 is arranged outside the sealing unit 3. The setting of the sealing unit 3 not only increases the sealing of the piezoelectric membrane, but also increases the tightness between the support body 2 and the base membrane 1.

[0069] The sealing unit 3 includes a rubber gasket 31, a fixing ring 1 32, a fixing ring 2 33 and an inner tube 34. The rubber gasket 31 is arranged at the lower end of the outer ring support body 2, the fixing ring 1 32 is arranged on the outer wall of the lower end of the inner tube 34, and the fixing ring 2 33 is arranged below the rubber gasket 31, and a fastening mechanism 35 is provided between the fixing ring 1 32.

[0070] The fastening mechanism 35 comprises two symmetrically arranged threaded grooves 351 and fastening bolts 352 formed in the wall of the first retaining ring 32. The threaded grooves 351 are internally threaded with fastening bolts 352, and the lower ends of the fastening bolts 352 are rotatably connected to the second retaining ring 33. During use, the fastening bolts 352 are first rotated, and the threaded grooves 351 then act to bring the second retaining ring 33 and the first retaining ring 32 closer together, exerting a vertical force on the support body 2. This strengthens the tightness between the support body 2 and the base membrane 1, and also increases the tightness between the rubber gasket 31 and the lower end of the outer support body 2. This, in conjunction with the arrangement of the inner tube 34 and the outer tube 4, creates a sealing effect. Because the fastening bolts 352 exert a vertical force on the outer support body 2, this solves the problem of horizontal force on the outer support body 2, which can damage or shorten the life of the support body, caused by conventional methods that directly attach a sealing ring to the side of the base membrane 1.

[0071] An internal thread 5 is provided on the outer wall of the inner tube 34, and an external thread 6 matching the internal thread 5 is provided on the inner wall of the outer tube 4. The internal thread 5 and the external thread 6 are threadedly connected. Through the setting of the internal thread 5 and the external thread 6, the inner tube 34 can be directly transferred into the outer tube 4, thereby completing the installation and fixation of the inner tube 34 and the voltage membrane.

Claims

1. A screening vibration membrane with a piezoelectric ceramic array structure as a support, characterized in that: The invention comprises a selective separation layer, a base film (1) and a support body (2), wherein the selective separation layer and the support body (2) are respectively located on both sides of the base film (1), the base film (1) is a porous ceramic sheet, the support body (2) is a piezoelectric ceramic block array located on one side of the base film (1), the spacing between the piezoelectric ceramic blocks in the array is 0.1-5 mm, and the projected area of ​​the piezoelectric ceramic blocks on the selective separation layer is 0.5-5 mm 2 .

2. The sieve diaphragm with a piezoelectric ceramic array structure as a support according to claim 1, characterized in that: The base membrane has a thickness of 100-2000 μm, is made of porous ceramic, and has a pore size range of 0.01-5 μm; the selective separation layer has a thickness of 1-50 μm, is made of porous ceramic, and has a pore size range of 1-1000 nm.

3. The sieve diaphragm supported by a piezoelectric ceramic array structure according to claim 1, characterized in that: The piezoelectric ceramic material in the piezoelectric ceramic block is one of lead zirconate titanate (PZT), potassium sodium niobate (KNN), and barium titanate (BaTiO3).

4. The method for preparing a sieve vibration membrane with a piezoelectric ceramic array structure as a support according to claim 1, characterized in that: The steps include: Step 1: One side of the base film is fixed to a mold, wherein the mold has openings matching the shape of the piezoelectric ceramic block array; Step 2: adding a slurry containing piezoelectric ceramic powder into the opening, demolding the slurry after curing, and sintering the slurry to obtain a piezoelectric ceramic block array; Step 3: applying a sol or a membrane-forming liquid to the other side of the base film, and sintering to obtain a selective separation layer; Step 4: polarize the piezoelectric ceramic block array.

5. The method for preparing a sieve vibration membrane with a piezoelectric ceramic array structure as a support according to claim 4, characterized in that: In the step 1, the base film and the mold are fixed by a polymer binder, and the polymer binder is one of polyvinyl alcohol, polyethylene glycol and polyvinylidene fluoride.

6. The method for preparing a sieve vibration membrane with a piezoelectric ceramic array structure as a support according to claim 4, characterized in that: In step 2, the slurry contains piezoelectric ceramic powder, a dispersant, and a cross-linking agent; the solid content of the slurry is 50-80 wt %; the organic monomer for the cross-linking reaction is polyvinyl alcohol; the solvent is water; the cross-linking agent is 2,5-dimethoxydihydrofuran; and the dispersant is N,N-bis(2-hydroxyethyl)glycine; In step 2, the weight ratio of the organic monomer to the cross-linking agent is 10-100:1, and the mass ratio of the dispersant to the piezoelectric ceramic powder is 1-5:

100.

7. The method for preparing a sieve vibration membrane with a piezoelectric ceramic array structure as a support according to claim 4, characterized in that: The curing process is through cross-linking at 60-120°C for 0.5-5 hours. The mold material is one of polypropylene, polyethylene, and polytetrafluoroethylene. The demoulding process involves raising the temperature to 160-450°C, and the mold itself pyrolyzes into liquid or gas. In step 2, the sintering temperature is 1100-1500°C; In step 2, the particles in the sol or film-forming liquid are one of Al2O3, ZrO2 and TiO2, and the coating time is controlled within 30 to 300 seconds.

8. The method for preparing a sieve vibration membrane with a piezoelectric ceramic array structure as a support according to claim 4, characterized in that: In step 4, the polarization electric field intensity is 1-10 kV / mm; the polarization temperature is 60-140° C.; and the polarization time is 0.5-2 h.

9. Application of the sieve vibration membrane supported by the piezoelectric ceramic array structure as claimed in claim 1 in liquid filtration.

10. The use according to claim 9, characterized in that During application, the screening vibration membrane is sealed in the assembly, and the assembly includes a sealing unit (3) and an outer tube (4) arranged outside the base membrane (1) and the support body (2), and the outer tube (4) is arranged outside the sealing unit (3); The sealing unit (3) includes a rubber gasket (31), a fixing ring 1 (32), a fixing ring 2 (33) and an inner tube (34), wherein the rubber gasket (31) is arranged at the lower end of the outer ring support body (2), the fixing ring 1 (32) is arranged on the outer wall of the lower end of the inner tube (34), and the fixing ring 2 (33) is arranged below the rubber gasket (31) and a fastening mechanism (35) is provided between the fixing ring 1 (32). The fastening mechanism (35) includes two symmetrically distributed thread grooves (351) and a fastening bolt (352) provided on the wall of the first fixing ring (32). The thread groove (351) is internally threaded with the fastening bolt (352). The lower end of the fastening bolt (352) is rotatably connected to the second fixing ring (33). An internal thread (5) is provided on the outer wall of the inner tube (34), and an external thread (6) matching the internal thread (5) is provided on the inner wall of the outer tube (4), wherein the internal thread (5) and the external thread (6) are threadedly connected.

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