Electrode material of high-voltage electrostatic water treater and preparation method of electrode material

Abstract

The invention provides a high-voltage electrostatic water treater electrode material and a preparation method thereof, and belongs to the technical field of water treatment equipment. The electrode material for the high-voltage electrostatic water treater comprises a flexible tubular substrate, the carbon-based conductive layer is compounded on the inner wall of the substrate; the metal supporting net is embedded in the base body; and the dielectric constants of the inner insulating layer and the outer insulating layer wrapping the substrate are gradually reduced from inside to outside. The flexible tubular substrate is used as a support, and the carbon-based conductive layer is compounded, so that the conductivity of the electrode material is improved, and the mechanical strength of the electrode material is enhanced; meanwhile, the spiral metal supporting net embedded in the substrate further enhances the structural stability of the electrode material; and the inner insulating layer and the outer insulating layer which are coated outside the base body not only play an insulating role, but also optimize the distribution of an electrostatic field and improve the polarization efficiency of water molecules through the design that the dielectric constant is gradually reduced from inside to outside, so that the electrode material has excellent corrosion resistance and stable conductivity.

Description

Technical Field

[0001] The present application relates to the technical field of water treatment equipment, and in particular to a high-voltage electrostatic water treatment device electrode material and a preparation method thereof. Background Art

[0002] Cooling water systems often face operational issues such as scaling, corrosion, and microbial growth. Scaling, in particular, significantly impacts the heat transfer efficiency of heat exchange equipment and can even damage it, resulting in significant economic losses. Therefore, the adoption of appropriate circulating cooling water treatment technologies is crucial for ensuring the safe and economical operation of thermal power plants. High-voltage electrostatic water treatment technology, a technology developed in recent decades, is increasingly being used for scale prevention and removal in industrial circulating cooling water systems due to its effectiveness and lack of secondary pollution. This technology holds great promise and warrants urgent research.

[0003] High-voltage electrostatic water treatment achieves scale and corrosion inhibition by altering the structure of water molecules. Due to the asymmetry between hydrogen and oxygen atoms in water molecules, water molecules possess polarity. When subjected to a high-voltage electrostatic field, they polarize, increasing their polarity and transforming them into water dipoles. These molecules align themselves in a chain-like pattern, with their positive ends facing the cathode and their negative ends facing the anode, forming a neat, connected chain. When the water contains dissolved salts, their positive and negative ions are surrounded by the water dipoles, preventing them from moving freely in the water and contacting the vessel walls, thereby preventing scale from depositing. Furthermore, the polarization of water causes water molecules to gravitate toward the vessel walls, causing old scale to deform and gradually fall off.

[0004] Existing high-voltage electrostatic water treatment device electrode materials have the following problems: First, they lack corrosion resistance. Prolonged operation in high-voltage electrostatic fields and water environments can easily lead to corrosion of the electrode material, affecting the equipment life and treatment effect. Second, they have a high dirt deposition rate. Dirt easily accumulates on the surface of the electrode material, resulting in reduced electrode performance, requiring frequent cleaning and maintenance, and increasing operating costs. This application aims to provide a high-voltage electrostatic water treatment device electrode material with strong corrosion resistance and a low dirt deposition rate, as well as a preparation method, to address the problems existing in the prior art. Summary of the Invention

[0005] The present application is made in view of the above-mentioned problems, and its purpose is to provide a high-voltage electrostatic water treatment device electrode material and a preparation method thereof. The design of the high-voltage electrostatic water treatment device electrode material fully considers the corrosion resistance and anti-fouling deposition performance of the material; by adopting a flexible tubular matrix as a supporting structure, the overall strength and stability of the electrode material are guaranteed; the carbon-based conductive layer composited on the inner wall of the matrix has good conductivity, ensuring the uniform distribution of the high-voltage electrostatic field; the metal support mesh embedded in the matrix not only enhances the mechanical strength of the electrode material, but also realizes self-anchoring through the radial expansion generated after thermal activation, thereby improving the bonding force between the electrode material and the matrix; the inner insulating layer and the outer insulating layer covering the outside of the matrix have a dielectric constant that decreases from the inside to the outside, effectively preventing current leakage, while improving the corrosion resistance of the electrode material.

[0006] Specifically, the first aspect of the present application provides a high-voltage electrostatic water processor electrode material, comprising: a flexible tubular substrate; A carbon-based conductive layer composited on the inner wall of the substrate; a spiral metal support mesh embedded in the matrix; The dielectric constants of the inner insulating layer and the outer insulating layer covering the substrate decrease from the inside to the outside, and the dielectric constant difference between the materials of the inner insulating layer and the outer insulating layer is ≥15.

[0007] Furthermore, the metal support mesh is made of nickel-titanium alloy, and after thermal activation, it generates radial expansion to achieve self-anchoring. Furthermore, the carbon-based conductive layer comprises nanocarbon material, and the interlayer spacing is ≤1 nm.

[0008] Furthermore, the inner insulating layer is a high dielectric ceramic composite layer, and the outer insulating layer is a hydrophobic polymer layer.

[0009] Furthermore, the high dielectric ceramic composite layer is a BaTiO3@Al2O3 / PVDF composite layer, and the hydrophobic polymer layer is a fluorosilicone rubber / nano-SiO2 composite layer.

[0010] The second aspect of the present application provides a method for preparing the electrode material of the high-voltage electrostatic water processor, comprising the following steps: (a) Substrate surface activation treatment; (b) continuous coating of a conductive layer; (c) Cold implanted metal support mesh, thermal activation treatment to make the metal support mesh expand radially by ≥10%; (d) co-extruded gradient insulation layer; (e) In-line curing.

[0011] Furthermore, the activation treatment in step (a) is plasma activation under a helium / oxygen mixed gas with a power of 6-10 kW and a processing speed of 2-4 m / min.

[0012] Furthermore, in step (b), a graphene / carbon nanotube slurry is coated on the inner surface of the substrate to form a conductive layer, with a coating speed of ≥2 m / min and infrared drying.

[0013] Furthermore, the cold implantation in step (c) is performed at room temperature with an implantation pressure of 0.1-0.5 MPa; and / or The thermal activation treatment is achieved by treating with hot water at 70-80°C for 1-10 minutes; After thermal activation, the metal support mesh forms a mechanical interlocking structure with the substrate, and the anchoring strength is ≥20N / mm.

[0014] Furthermore, step (d) adopts a double barrel co-extrusion system, and the double barrels extrude the inner insulating layer BaTiO3@Al2O3 / PVDF composite layer and the outer insulating layer fluorosilicone rubber / nano-SiO2 composite layer.

[0015] Furthermore, step (e) is UV curing with a UV intensity of 700-900 mJ / cm 2 .

[0016] The present invention has the following beneficial effects: The present invention adopts a flexible tubular matrix as a support and is compounded with a carbon-based conductive layer, which not only improves the conductive performance of the electrode material but also enhances its mechanical strength. At the same time, the spiral metal support mesh embedded in the matrix further enhances the structural stability of the electrode material. The inner and outer insulating layers wrapped around the matrix not only play an insulating role, but also optimize the distribution of the electrostatic field through the design of decreasing dielectric constant from the inside to the outside, improve the efficiency of water molecule polarization, and make the electrode material have excellent corrosion resistance and stable conductive properties. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is described and illustrated below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are merely used to explain this application and are not intended to limit this application. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without making any creative work are within the scope of protection of this application.

[0018] Obviously, the following descriptions are merely some examples or embodiments of the present application. Those skilled in the art can apply the present application to other similar scenarios without inventive effort. Furthermore, it is also understood that, although the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in the present application, changes in design, manufacturing, or production based on the technical content disclosed in the present application are merely conventional technical means and should not be construed as an insufficiency of the content disclosed in the present application.

[0019] An embodiment of the first aspect of the present application provides a high-voltage electrostatic water processor electrode material, comprising: a flexible tubular substrate; A carbon-based conductive layer composited on the inner wall of the substrate; a spiral metal support mesh embedded in the matrix; The dielectric constants of the inner insulating layer and the outer insulating layer covering the substrate decrease from the inside to the outside, and the dielectric constant difference between the materials of the inner insulating layer and the outer insulating layer is ≥15.

[0020] The present invention adopts a flexible tubular matrix as a support and is compounded with a carbon-based conductive layer, which not only improves the electrical conductivity of the electrode material but also enhances its mechanical strength. At the same time, the spiral metal support mesh embedded in the matrix further enhances the structural stability of the electrode material. The inner and outer insulating layers coated on the outside of the matrix not only play an insulating role, but also optimize the distribution of the electrostatic field and improve the efficiency of water molecule polarization through the design of the dielectric constant decreasing from the inside to the outside. The dielectric constant difference between the inner and outer insulating layer materials is ≥15, making the electric field distribution more uniform and further enhancing the effect of water molecule polarization. In addition, the design of the dielectric constant difference can also effectively prevent current leakage and improve the safety of the electrode material. This makes the electrode material have excellent corrosion resistance and stable electrical conductivity.

[0021] In this embodiment, the flexible tubular substrate is constructed of medical-grade silicone tubing with a wall thickness of approximately 1 mm and a bending radius of R = 40 mm. In a preferred embodiment, the tubing incorporates a stainless steel support mesh, which enhances the structural strength of the substrate, making it less susceptible to deformation or breakage during use. Furthermore, the tubing exhibits excellent biocompatibility and chemical stability, enabling long-term stable operation in high-voltage electrostatic fields and aqueous environments without corrosion or aging, thereby ensuring the lifespan of the electrode material and ensuring optimal treatment results.

[0022] Furthermore, the carbon-based conductive layer comprises a nanocarbon material with an interlayer spacing of ≤1nm. Furthermore, the carbon-based conductive layer is a graphene / carbon nanotube composite material, which is composited onto the inner wall of the substrate by continuous coating to form a uniform and dense conductive layer with a thickness of 0.1-0.2mm. Graphene and carbon nanotubes both have high conductivity and excellent mechanical properties, and can effectively improve the conductivity and mechanical strength of the electrode material. At the same time, since the interlayer spacing of the nanocarbon material is small, it is conducive to the transmission of electrons between the layers, further improving the conductivity of the conductive layer.

[0023] Specifically, the graphene / carbon nanotube composite material is prepared by dispersing graphene and carbon nanotubes in a bio-based gallic acid epoxy resin at a ratio of 2-3:1, uniformly dispersing the nanocarbon material through ultrasonic treatment, then adding 1-5% polyvinyl butyral and stirring to obtain a slurry with a solid content of 20-30%. The slurry is continuously coated on the inner wall of a substrate using a coating device and then dried by infrared irradiation to form a conductive layer.

[0024] The spiral metal support mesh is made of nickel-titanium alloy, which is purchased from Jinbaoji Fanruida Titanium Co., Ltd. The nickel content is usually 55%-56% atomic percentage, with titanium as the balance. The tensile strength is 800-1000 MPa and the fatigue life is more than 10 ^7 cycles. The nickel-titanium alloy support mesh expands radially after thermal activation to achieve self-anchoring. Nickel-titanium alloy is a shape memory alloy, and its austenite phase transition temperature Af=55-65°C. The pitch of the spiral metal support mesh is 0.5-1.5 times the diameter of the substrate, and the embedding depth is 20%-40% of the thickness of the substrate wall. Preferably, the pitch is 0.8 times the diameter of the substrate, and the embedding depth is 30% of the thickness of the substrate wall, which effectively enhances the structural stability and corrosion resistance of the electrode material. The setting of the spiral metal support body can not only enhance the structural stability of the electrode material, but also produce a weak eddy current effect under the action of a high-voltage electrostatic field, thereby promoting the polarization of water molecules.

[0025] The inner insulating layer is a high-dielectric ceramic composite layer, and the outer insulating layer is a hydrophobic polymer layer. The inner insulating layer is made of a BaTiO3@Al2O3 / PVDF composite material. The BaTiO3@Al2O3 / PVDF composite material is prepared by coating BaTiO3 nanoparticles with a layer of Al2O3, then mixing with PVDF resin and producing the result through melt blending and extrusion. BaTiO3 was purchased from Qinghe Chaotai Metal Materials Co., Ltd., CAS number 1300-2-4. BaTiO3 has a high dielectric constant and can effectively improve the dielectric properties of the insulating layer. Al2O3 was purchased from Qinghe Chaotai Metal Materials Co., Ltd., CAS number 1344-2-2. As a coating layer, Al2O3 can enhance the interfacial bonding between BaTiO3 and PVDF, thereby improving the stability and durability of the composite material. PVDF resin was purchased from Shenzhen Boen New Materials Co., Ltd., model number Solef 11010 / 0001, with a tensile strength of 40-55 MPa, a flexural strength of 75-78 MPa, and a thermal expansion coefficient of 8-15×10 -5 / ℃, density is 1.75-1.80g / cm 3 The dielectric constant is 8-9 (1kHz), and the volume resistivity is >1×10 14 Ω·cm. PVDF resin offers excellent processing properties and mechanical strength, making the insulation layer easy to form and possessing a certain degree of toughness. The high-dielectric ceramic composite layer within the inner insulation layer optimizes the distribution of the electrostatic field and increases the efficiency of water molecule polarization.

[0026] The hydrophobic polymer layer of the outer insulating layer is made of fluorosilicone rubber / nano-SiO2 composite material. The fluorosilicone rubber is purchased from Beijing PowerSeal Technology Co., Ltd. and has a density of 1.5-1.9 g / cm 3 , with a tensile strength of 7-10 MPa. Fluorosilicone rubber exhibits excellent hydrophobicity and corrosion resistance, effectively preventing the erosion of the electrode material by moisture and corrosive substances. Nano-SiO2, purchased from Shandong Hao Innovation Materials Technology Co., Ltd., further enhances the hardness and wear resistance of the hydrophobic polymer layer. The synergistic effect of the composite material of the inner and outer insulating layers imparts not only excellent insulation properties but also good corrosion resistance and mechanical strength, further improving the overall performance of the electrode material.

[0027] The embodiment of the second aspect of the present application provides a method for preparing the electrode material of the high-voltage electrostatic water processor, comprising the following steps: (a) Substrate surface activation treatment; (b) continuous coating of a conductive layer; (c) Cold implanted metal support mesh, thermal activation treatment to make the metal support mesh expand radially by ≥10%; (d) co-extruded gradient insulation layer; (e) In-line curing.

[0028] In this embodiment, the activation treatment in step (a) is performed using a helium / oxygen mixture (helium / oxygen = 95 / 5) with a plasma activation power of 6-10 kW, a processing speed of 2-4 m / min, and a processing time of 60-70 s. This activation treatment simultaneously cleans the surface and etchs micro-pits, thereby increasing the roughness and specific surface area of ​​the substrate surface and enhancing the bonding between the conductive layer and the substrate. By adjusting the plasma activation parameters, such as power, processing speed, and processing time, the degree of activation on the substrate surface can be precisely controlled, ensuring uniform coating and strong bonding of the conductive layer.

[0029] In this embodiment, in step (b), a conductive layer is formed on the inner surface of the substrate by micro-gravure coating of a graphene / carbon nanotube slurry at a coating speed of 2-4 m / min. By precisely controlling the coating speed and the solids content of the slurry, a uniform and dense conductive layer is ensured, with a thickness within the range of 0.1-0.2 mm. After coating, the conductive layer is rapidly dried using infrared drying equipment at a temperature of 120-130°C for 20-30 seconds to remove the solvent from the slurry, allowing the conductive layer to solidify and adhere tightly to the inner surface of the substrate.

[0030] In this embodiment, the mesh density of the nickel-titanium alloy support mesh in step (c) is 100 mesh, and the cold implantation is carried out at room temperature. The vacuum suction cup fixes the substrate, and the nickel-titanium alloy support mesh (Af=60°C) is compressed to 88% of the diameter. The nickel-titanium alloy support mesh is implanted into the substrate using a mesh drum unwinder with an implantation pressure of 0.1-0.5 MPa. A silicone roller is then used for rolling to ensure that the metal support mesh is tightly bonded to the substrate. Subsequently, a heat activation treatment is performed, and the substrate implanted with the metal support mesh is placed in hot water at 70-80°C for 1-10 minutes to cause the nickel-titanium alloy support mesh to expand radially with an expansion amplitude of ≥10%, thereby achieving self-anchoring. After the heat activation treatment, a mechanical interlocking structure is formed between the metal support mesh and the substrate, and the anchoring strength is ≥20N / mm, which effectively enhances the structural stability and corrosion resistance of the electrode material.

[0031] In this embodiment, step (d) utilizes a dual-barrel co-extrusion system to extrude an inner insulating layer (BaTiO3@Al2O3 / PVDF) and an outer insulating layer (fluorosilicone rubber / nano-SiO2). The dielectric constant difference between the inner and outer insulating layers is ≥15. Specifically, the inner insulating layer (BaTiO3@Al2O3 / PVDF) is prepared by melt blending and extrusion at a temperature of 200-230°C to ensure the uniformity and stability of the composite material. The outer insulating layer (fluorosilicone rubber / nano-SiO2) is extruded at a low temperature of 100-150°C to minimize the effects of high temperatures on the properties of the fluorosilicone rubber. The dual-barrel co-extrusion system allows for precise control of the extrusion speed and thickness of the inner and outer insulating layers, ensuring uniformity and a gradient variation in the layers. During the co-extrusion process, the inner and outer insulating layer materials are combined in the mold to form an insulating layer with a gradient dielectric constant, optimizing the distribution of the electrostatic field and increasing the efficiency of water molecule polarization.

[0032] In this embodiment, step (e) adopts UV curing with a UV intensity of 700-900 mJ / cm 2 , with a curing time of 1-5 seconds. UV curing offers the advantages of high efficiency, environmental friendliness, and energy conservation. It can quickly cure the insulation layer while avoiding the thermal stress and deformation that may occur during thermal curing. By precisely controlling the UV curing parameters, uniform curing and excellent performance of the insulation layer can be ensured.

[0033] The electrode material of the present invention adopts a 28kV high voltage withstand test, and the leakage current threshold is ≤0.01mA.

[0034] In summary, the high-voltage electrostatic water treatment device electrode material and preparation method provided in this application achieve excellent corrosion resistance and stable conductivity through the structural design of a flexible tubular substrate, a carbon-based conductive layer, a spiral metal support mesh, and a gradient insulation layer, as well as specific preparation steps and parameter control. This electrode material has broad application prospects in high-voltage electrostatic water treatment devices and can effectively improve water treatment efficiency and treatment effects.

[0035] Example The following examples describe the present disclosure in more detail and are intended to be illustrative only, as various modifications and variations within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are by weight. Unless otherwise stated, all reagents used in the examples are available through conventional commercial sources or synthesized according to conventional methods and can be used directly without further processing. Unless otherwise stated, all instruments used in the examples are available through conventional commercial sources.

[0036] Example 1 A high-voltage electrostatic water processor electrode material, comprising: Flexible silicone tubular substrate; A carbon-based conductive layer is compounded on the inner wall of the substrate. The carbon-based conductive layer is made of a graphene / carbon nanotube composite material and is compounded on the inner wall of the substrate by continuous coating to form a uniform and dense conductive layer with a thickness of 0.1-0.2 mm. A spiral metal support mesh embedded in the matrix, the spiral metal support mesh is made of memory alloy nickel-titanium alloy; The inner and outer insulating layers surrounding the substrate consist of a high-dielectric ceramic composite layer made of BaTiO3@Al2O3 / PVDF composite material and a hydrophobic polymer layer made of fluorosilicone rubber / nano-SiO2 composite material. The dielectric constant of the insulating layers decreases from the inside out.

[0037] The method for preparing the electrode material of the high-voltage electrostatic water processor comprises the following steps: (a) Substrate surface activation treatment: plasma activation was performed in a helium / oxygen mixture (helium / oxygen = 95 / 5) with a power of 8 kW, a processing speed of 3 m / min, and a processing time of 60 s. (b) Continuous coating of the conductive layer: The graphene / carbon nanotube slurry was coated using a micro-gravure coating process to form the conductive layer at a coating speed of 3 m / min and a thickness controlled within the range of 0.1-0.2 mm. (c) Cold implantation of the shaped metal support mesh, followed by heat activation treatment to cause the metal support mesh to expand radially by ≥10%: at room temperature, the substrate is fixed with a vacuum suction cup, and the nickel-titanium alloy support mesh is compressed to 88% of its diameter. The nickel-titanium alloy support mesh is implanted into the substrate using a mesh drum unwinder with an implantation pressure of 0.3 MPa, and then rolled using a silicone roller to ensure that the metal support mesh is tightly bonded to the substrate. Subsequently, heat activation treatment is performed, and the substrate with the implanted metal support mesh is placed in hot water at 70°C for 8 minutes to cause the nickel-titanium alloy support mesh to expand radially by ≥10%, thereby achieving self-anchoring.

[0038] (d) Co-extrusion gradient insulation layer: Using a double-barrel co-extrusion system, the inner insulation layer, BaTiO3@Al2O3 / PVDF composite layer, was prepared by melt blending and extrusion at an extrusion temperature of 200°C; the outer insulation layer, fluorosilicone rubber / nano-SiO2 composite layer, was prepared by low-temperature extrusion at an extrusion temperature of 100°C. The dielectric constant difference between the inner and outer insulation layers was ≥15. (e) Online curing: UV intensity is 800mJ / cm 2 , curing time is 3s.

[0039] Example 2 This embodiment is basically the same as embodiment 1, except that the power of plasma activation in step (a) is 9 kW, the processing speed is 2 m / min, and the processing time is 70 s.

[0040] Example 3 This embodiment is basically the same as embodiment 1, except that in step (c), the heat activation treatment is performed by placing the substrate embedded with the metal support mesh in hot water at 80° C. for 5 minutes.

[0041] Example 4 This embodiment is basically the same as embodiment 1, except that in step (d), the extrusion temperature of the inner insulating layer is 220°C; and the extrusion temperature of the outer insulating layer is 130°C.

[0042] Example 5 This embodiment is basically the same as embodiment 1, except that the UV intensity in step (e) is 700 mJ / cm 2 , curing time is 5s.

[0043] Comparative Example 1 This comparative example is basically the same as Example 1, except that the nickel-titanium alloy support mesh is replaced with a 304 stainless steel mesh.

[0044] Comparative Example 2 Use 316L stainless steel solid electrode.

[0045] Comparative Example 3 Titanium alloy (Ti6Al4V) electrodes are used.

[0046] Comparative Example 4 A commercially available ion bar water processor, model LD-IV-3000-27, was used.

[0047] Experimental Case (1) Water quality: Total hardness: 8.2±0.5 mmol / L; temperature: 70±2℃; pH: 8.2±0.2 (automatic NaHCO3 adjustment); water flow rate 0.5-2.8m / s.

[0048] (2) Electric field parameters: Input voltage: AC220V±20V, 50Hz; Output voltage: DC 25-28 kV; Leakage current monitoring accuracy: 0.1μA.

[0049] (3) Test cycle Corrosion rate test: 2000 hours; dirt deposition test: 720 hours.

[0050] Salt spray tests were performed on Examples 1-5 and Comparative Examples 1-4 according to GB / T 10124. The results are shown in Table 1.

[0051]

[0052] The dirt deposition rate test was performed on Examples 1-5 and Comparative Examples 1-4. The results are shown in Table 2.

[0053]

[0054] As can be seen from Table 1, the electrode materials of Examples 1-5 showed extremely low corrosion rates and maximum pitting depths in the salt spray test, and the surface condition remained good. In contrast, the electrode materials of Comparative Examples 1-4 showed varying degrees of corrosion. Specifically, the 304 stainless steel mesh in Comparative Example 1 was corroded at the junction of the metal meshes; the 316L stainless steel solid electrode in Comparative Example 2 was fully corroded, with a rust layer thickness exceeding 100 μm; dense local pitting pits appeared on the surface of the titanium alloy electrode in Comparative Example 3; and the commercially available ion rod in Comparative Example 4 was corroded at the location where the insulating layer was damaged. These results show that the electrode material provided by the present invention has excellent corrosion resistance.

[0055] The fouling rate test results in Table 2 show that the electrode materials of Examples 1-5 all performed well in terms of CaCO3 deposition rate and fouling adhesion strength. Among them, Example 4 had the highest CaCO3 deposition rate and fouling adhesion strength, but still maintained a relatively low level. The electrode materials of Comparative Examples 1-4, in contrast, exhibited relatively high fouling rates and fouling adhesion strengths, particularly Comparative Examples 2 and 3, which far exceeded those of the Examples. This demonstrates that the electrode materials provided by the present invention have excellent fouling resistance, effectively reducing fouling deposition in water treatment systems and improving water treatment efficiency.

[0056] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A high-voltage electrostatic water treatment device electrode material, characterized in that: include: a flexible tubular substrate; A carbon-based conductive layer composited on the inner wall of the substrate; a metal support mesh embedded in the matrix; The dielectric constants of the inner insulating layer and the outer insulating layer covering the substrate decrease from the inside to the outside, and the dielectric constant difference between the materials of the inner insulating layer and the outer insulating layer is ≥15.

2. The high-voltage electrostatic water treatment device electrode material according to claim 1, characterized in that: The metal support mesh is made of nickel-titanium alloy and generates radial expansion after thermal activation to achieve self-anchoring.

3. The high-voltage electrostatic water treatment device electrode material according to claim 1, characterized in that: The carbon-based conductive layer comprises nano-carbon material, and the interlayer spacing is ≤1nm.

4. The high-voltage electrostatic water treatment device electrode material according to claim 1, characterized in that: The inner insulating layer is a high dielectric ceramic composite layer, and the outer insulating layer is a hydrophobic polymer layer.

5. A method for preparing an electrode material for a high-voltage electrostatic water treatment device according to any one of claims 1 to 4, characterized in that: The following steps are involved: (a) Substrate surface activation treatment; (b) continuous coating of a conductive layer; (c) Cold implantation of the shaped metal support mesh, followed by heat activation treatment to cause the metal support mesh to expand radially by ≥10%; (d) co-extruded gradient insulation layer; (e) In-line curing.

6. The method for preparing the electrode material of the high-voltage electrostatic water treatment device according to claim 5, characterized in that: The activation treatment in step (a) is plasma activation under a helium / oxygen mixed gas with a power of 6-10 kW and a processing speed of 2-4 m / min.

7. The method for preparing the electrode material of the high-voltage electrostatic water treatment device according to claim 5, characterized in that: In step (b), a graphene / carbon nanotube slurry is coated on the inner surface of the substrate to form a conductive layer, with a coating speed of ≥2 m / min and infrared drying.

8. The method for preparing the electrode material of the high-voltage electrostatic water treatment device according to claim 5, characterized in that: The cold implantation in step (c) is performed at room temperature with an implantation pressure of 0.1-0.5 MPa; and / or The thermal activation treatment is achieved by treating with hot water at 70-80° C. for 1-10 minutes. After thermal activation, the metal support mesh forms a mechanical interlocking structure with the substrate, and the anchoring strength is ≥20N / mm.

9. The method for preparing the electrode material of the high-voltage electrostatic water treatment device according to claim 5, characterized in that: Step (d) uses a double barrel co-extrusion system to extrude the inner insulation layer BaTiO3@Al2O3 / PVDF composite layer and the outer insulation layer fluorosilicone rubber / nano-SiO2 composite layer.

10. The method for preparing the electrode material of the high-voltage electrostatic water treatment device according to claim 5, characterized in that: Step (e) uses UV curing with a UV intensity of 700-900 mJ / cm 2 .

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