Carbon powder-based filter manufacturing method

Abstract

The invention relates to a carbon powder-based filter manufacturing method, which comprises the following steps: mixing different components of carbon powder with a preset functional material to obtain a carbon powder material mixture, and carrying out surface functionalization treatment on each mixture to enhance the characteristics of the mixture. And pressing each functional carbon powder mixture by using a powder pressing control function to form the carbon powder filter membrane with different pore diameters. And stacking the filter membranes according to a sequence of pore diameters from large to small to form a carbon powder filter membrane stack. Different reinforcing materials are added between the adjacent filter membranes, so that the strength and durability of the filter membranes are further improved. And pressing the mixed filter membrane stack by using an isostatic pressing control function to obtain the carbon powder filter pressed body. And wrapping chemical fibers with different pore diameters on the normal surface of the pressed body, and placing the final product in a filter vat to form the efficient carbon powder filter. The framework strength of the carbon powder filter can be kept, materials of the carbon powder filter are prevented from falling off in the using process, and therefore the filtering efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of magazine filtering, and in particular to a method for manufacturing a filter based on carbon powder. Background Art

[0002] The traditional method of making carbon powder filters usually involves mixing activated carbon powder with a suitable binder to form a carbon powder block or a carbon powder membrane, which is then installed in the filter frame. During the manufacturing process, the ratio of activated carbon powder to binder, the pressing process, and the thickness of the carbon powder layer will affect the filtering effect. The porous surface structure of activated carbon powder can absorb impurities, odors, and harmful substances in water. However, the traditional method of making filters is prone to carbon powder falling off after a period of use due to the large particle size and loose structure of activated carbon particles, thereby reducing the filtering efficiency. Summary of the invention

[0003] Based on this, it is necessary to provide a method for manufacturing a filter based on carbon powder, which can maintain the structural strength of the carbon powder filter and prevent the material of the carbon powder filter from falling off during use, thereby improving the filtering efficiency.

[0004] One aspect of the present invention provides a method for manufacturing a filter based on carbon powder, comprising the following steps:

[0005] Mixing a plurality of carbon powders of different weights with preset functional materials respectively to obtain carbon powder material mixtures;

[0006] Performing surface functionalization treatment on each of the carbon powder material mixtures to obtain functional carbon powder mixtures;

[0007] Controlling the powder pressing machine according to the powder pressing control function to press each functional carbon powder mixture respectively to form each functional carbon powder filter membrane;

[0008] The functional carbon powder filter membranes are stacked in descending order of their pore sizes to obtain a carbon powder filter membrane stack;

[0009] Adding carbon powder filter membrane reinforcement materials composed of different materials into two adjacent functional carbon powder filter membranes of the carbon powder filter membrane stack to obtain a mixed filter membrane stack;

[0010] Controlling the isostatic press according to the isostatic pressure control function to press the mixed filter membrane stack to obtain a carbon powder filter pressed body;

[0011] The normal surfaces of the carbon powder filter pressed body are respectively wrapped with chemical fibers of different pore sizes to obtain a carbon powder filter main body;

[0012] According to the three-dimensional information of the filter barrel, the carbon powder filter body is placed in the filter barrel to obtain a carbon powder filter.

[0013] In one embodiment, the powder pressing control function is expressed as:

[0014]

[0015] Among them, F1 is the output pressure of the powder press, P 1max is the maximum pressure of the powder press, ρ1 is the density of the functional carbon powder mixture, κ1 is the density influencing factor, t1 is the pressing time, t max is the maximum pressing time, T1 is the pressing temperature, T 1max is the maximum pressing temperature, γ is the temperature influence factor, v is the pressing speed, α1 is the pressing speed influence factor, δ1 is the exponential factor of the pressing speed on the filter membrane structure, ζ is the time-related material stress relaxation factor, and λ is the time-related stress relaxation rate factor.

[0016] In one embodiment, the pressing time, pressing temperature and pressing speed of the powder pressing machine are four working stages, and the powder pressing machine starts working in order of powder pre-pressing stage, powder rough pressing stage, powder fine pressing stage and powder holding pressure stage; the pressing time of the powder pre-pressing stage ranges from 30 to 120 seconds, the pressing temperature is 40 to 100 degrees Celsius, and the pressing speed is 1 to 3 mm / s; the pressing time of the powder rough pressing stage is 10 to 30 seconds, the pressing temperature is 100 to 150 degrees Celsius, and the pressing speed is 3 to 5 mm / s; the pressing time of the powder fine pressing stage is 60 to 180 seconds, the pressing temperature is 150 to 250 degrees Celsius, and the pressing speed is 1 to 3 mm / s; the pressing time of the powder holding pressure stage is 120 to 300 seconds, the pressing temperature is 150 to 300 degrees Celsius, and the pressing speed is 0.5 to 1 mm / s.

[0017] In one embodiment, the powder pressing control function is expressed as:

[0018]

[0019] Among them, F2 is the output static pressure of the isostatic press, P 2max is the maximum static pressure of the isostatic press, T2 is the real-time static pressing temperature, ρ2 is the real-time density of the mixed filter membrane stack, κ2 is the density influencing factor, t2 is the real-time static pressing time, t max is the maximum pressing time, t 2max is the maximum pressing temperature, δ2 is the temperature influence factor, θ is the time decay factor, τ is the exponential decay factor of stress relaxation, and α2 is the time square decay factor.

[0020] In one embodiment, the real-time static pressing temperature is supplied by a nonlinear heat source, and the heat source heat generation of the nonlinear heat source complies with the relationship between the heat source power and the temperature gradient; the expression of the relationship between the heat source power and the temperature gradient is,

[0021]

[0022] in, is the temperature gradient, A is the positive influence constant of the temperature gradient on the heat source heat, and α is the negative influence constant of the temperature gradient on the heat source heat.

[0023] In one embodiment, the functional carbon powder filter membranes of the hybrid filter membrane stack are respectively a carbon powder polymer filter membrane, a carbon powder metal filter membrane, a carbon powder ceramic filter membrane, a carbon powder fiber filter membrane and a carbon powder composite material filter membrane; the reinforcing materials of the carbon powder filter membranes of the hybrid filter membrane stack are respectively aluminum powder, ceramic powder, glass fiber and carbon fiber; the aluminum powder is added between the carbon powder polymer filter membrane and the carbon powder metal filter membrane, the ceramic powder is added between the carbon powder metal filter membrane and the carbon powder ceramic filter membrane, the glass fiber is added between the carbon powder ceramic filter membrane and the carbon powder fiber filter membrane, and the carbon fiber is added between the carbon powder fiber filter membrane and the carbon powder composite material filter membrane.

[0024] In one embodiment, when the mixed membrane stack is not pressed, the density of the carbon powder polymer membrane is 700 kg / m 3 The density of the carbon powder metal filter membrane is 900kg / m 3 The density of the carbon powder ceramic filter membrane is 1000kg / m 3 The density of the carbon powder fiber filter membrane is 1100kg / m 3 The density of the carbon powder composite material filter membrane is 1600 kg / m 3 ; The density of the aluminum powder is 1200kg / m 3 The density of the ceramic powder is 1400 kg / m 3 The density of the glass fiber is 1300 kg / m 3 And the density of the carbon fiber is 1500kg / m 3 .

[0025] In one embodiment, when the hybrid filter membrane stack has been pressed, the density of the carbon powder polymer filter membrane is 15102 kg / m 3 The density of the carbon powder metal filter membrane is 23010kg / m 3 The density of the carbon powder ceramic filter membrane is 28000kg / m 3 The density of the carbon powder fiber filter membrane is 23560kg / m 3The density of the carbon powder composite filter membrane is 53840 kg / m 3 ; The density of the aluminum powder is 24630kg / m 3 The density of the ceramic powder is 33860 kg / m 3 The density of the glass fiber is 34789kg / m 3 And the density of the carbon fiber is 45290kg / m 3 .

[0026] In one embodiment, the chemical fibers with different pore sizes are polypropylene fibers and polyethylene fibers, or both are polypropylene fibers; when the chemical fibers are polypropylene fibers and polyethylene fibers, the pore size of the polypropylene fiber is 0.5 to 2 microns, and the pore size of the polyethylene fiber is 2 to 5 microns; when the chemical fibers are polypropylene fibers, the pore sizes of the polypropylene fibers are 0.3 to 1 micron and 1 to 5 microns, respectively.

[0027] In one embodiment, each of the carbon powder material mixtures is respectively a carbon powder polymer mixture, a carbon powder metal mixture, a carbon powder ceramic mixture, a carbon powder fiber mixture and a carbon powder composite material mixture; the surface functionalization treatment corresponding to the carbon powder polymer mixture is plasma treatment, the surface functionalization treatment corresponding to the carbon powder metal mixture is electrochemical deposition treatment, the surface functionalization treatment corresponding to the carbon powder ceramic mixture is sol-gel treatment, the surface functionalization treatment corresponding to the carbon powder fiber mixture is surface oxidation treatment, and the surface functionalization treatment corresponding to the carbon powder composite material mixture is solution impregnation.

[0028] The above-mentioned method for making a filter based on carbon powder comprises the following steps: mixing several portions of carbon powder of different weights with preset functional materials to obtain carbon powder material mixtures; performing surface functionalization treatment on each carbon powder material mixture to obtain each functional carbon powder mixture; controlling a powder pressing machine according to a powder pressing control function to press each functional carbon powder mixture to form each functional carbon powder filter membrane; stacking each functional carbon powder filter membrane in the order of the carbon powder filter membrane pore size from large to small to obtain a carbon powder filter membrane stack; adding carbon powder filter membrane reinforcement materials composed of different materials to two adjacent functional carbon powder filter membranes of the carbon powder filter membrane stack to obtain a mixed filter membrane stack; controlling an isostatic press according to an isostatic pressing control function to press the mixed filter membrane stack to obtain a carbon powder filter pressed body; wrapping chemical fibers of different pore sizes on the normal surface of the carbon powder filter pressed body to obtain a carbon powder filter body; placing the carbon powder filter body in the filter barrel according to the three-dimensional information of the filter barrel to obtain a carbon powder filter.

[0029] By precisely controlling the mixing ratio of different carbon powders and functional materials and performing surface functionalization on the mixture, the excellent performance of the carbon powder material is ensured; and by using powder pressing and lamination processes, the pore size of each layer of functional carbon powder filter membrane can be precisely controlled, and the pore size can be stacked in descending order according to the pore size, which effectively improves the separation efficiency of the filter. In addition, carbon powder filter membrane reinforcement materials composed of different materials are added between adjacent functional carbon powder filter membranes, and the stack is pressed by isostatic pressure control technology, which significantly enhances the mechanical strength and durability of the filter membrane and ensures the stability of the filter in long-term use. After wrapping chemical fibers of different pore sizes on the normal surface, not only the filtration accuracy is further improved, but also the flux of the filter is enhanced, so that it can show higher efficiency and reliability when dealing with complex or fine particles. Overall, through the comprehensive application of multiple processes, not only can the structural strength of the carbon powder filter be maintained, the material of the carbon powder filter be prevented from falling off during use, thereby improving the filtration efficiency, but also the performance of the carbon powder filter can be optimized, and its applicability and long-term operation stability in the fields of medicine and environmental protection can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a method for making a filter based on carbon powder according to an embodiment;

[0031] Figure 2 FIG. 4 is a cross-sectional view of a carbon powder filter according to an embodiment. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] A method for making a filter based on carbon powder, such as Figure 1 As shown, the following steps are included:

[0035] S12, mixing several portions of carbon powder of different weights with preset functional materials respectively to obtain carbon powder material mixtures.

[0036] Among them, functional materials can be materials with specific functions and properties, which can play a unique role in specific application scenarios. Functional materials include materials with electrical conductivity, thermal conductivity, optical properties, magnetism, adsorption and other characteristics.

[0037] Among them, the carbon powder material mixture can be a substance formed by mixing carbon powder with other materials (such as polymers, metals, ceramics, etc.). These mixtures have the basic properties of carbon powder (such as good adsorption and stability), and also integrate the properties of other materials.

[0038] Specifically, carbon powders with different particle sizes and chemical properties are selected and mixed with preset functional materials according to a specific ratio. Functional materials may include metal oxides, activated carbon, catalysts, adsorbents, etc. The role of these materials is to enhance the specific properties of the filter membrane, such as improving the adsorption capacity of specific pollutants, improving their chemical stability or improving filtration efficiency. For example, if you need to improve the adsorption capacity of oil substances, you can choose to mix carbon powder with aluminum oxide or silicon dioxide. At the same time, the ratio of carbon powder to functional materials can be customized according to the different requirements of the filtration task. For example, if a certain application may require higher conductivity, carbon nanotubes can be added during mixing to optimize the conductivity of the filter membrane. During the mixing process, the dispersion and uniformity of the particles are the key to determining the final filter membrane performance. Therefore, it is necessary to ensure uniform mixing through mechanical stirring, ultrasound or ball milling to avoid instability of the filter membrane performance due to uneven particle distribution.

[0039] S14, performing surface functionalization treatment on each carbon powder material mixture to obtain each functional carbon powder mixture.

[0040] Among them, surface functionalization treatment can be to change the chemical properties and structure of the material surface through physical, chemical or biological methods to make it have certain specific functionalities.

[0041] Among them, the functional carbon powder mixture can be a composite formed by mixing carbon powder with other functional materials. These mixtures not only retain the adsorption characteristics and stability of carbon powder, but also give it additional characteristics such as conductivity, high temperature resistance, etc. by adding other functional materials.

[0042] Specifically, after the carbon powder is mixed with the functional material, the mixture is subjected to surface functionalization treatment, usually by chemical reaction or physical adsorption to change the surface properties of the carbon powder, with the goal of introducing specific functional groups, such as hydroxyl, amino, carboxyl, etc., so that the surface of the carbon powder has specific functional properties. For example, through amino functionalization treatment, the hydrophilicity of the carbon powder can be increased, thereby improving its filtering effect on water-soluble pollutants; and by introducing carboxyl groups, its adsorption capacity for heavy metal ions can be enhanced. Specifically, assuming that the surface functionalization treatment of a filter membrane gives it a higher affinity for oil droplets in water (such as oil in wastewater treatment), experimental data show that the oil-water separation efficiency of the filter can be increased by 20% after this treatment. This surface functionalization treatment method can more accurately regulate the chemical properties of the carbon powder surface to meet different filtration requirements, greatly improving its application range and effect.

[0043] In a specific embodiment, the carbon powder material mixtures are respectively a carbon powder polymer mixture, a carbon powder metal mixture, a carbon powder ceramic mixture, a carbon powder fiber mixture and a carbon powder composite material mixture; the surface functionalization treatment corresponding to the carbon powder polymer mixture is plasma treatment, the surface functionalization treatment corresponding to the carbon powder metal mixture is electrochemical deposition treatment, the surface functionalization treatment corresponding to the carbon powder ceramic mixture is sol-gel treatment, the surface functionalization treatment corresponding to the carbon powder fiber mixture is surface oxidation treatment, and the surface functionalization treatment corresponding to the carbon powder composite material mixture is solution impregnation.

[0044] Specifically, different types of carbon powder material mixtures (including carbon powder polymer mixtures, carbon powder metal mixtures, carbon powder ceramic mixtures, carbon powder fiber mixtures and carbon powder composite mixtures) use different surface functionalization treatment methods, which can adjust the surface properties of carbon powder through physical and chemical means to make it have specific functions to meet various application requirements.

[0045] The carbon powder polymer mixture is treated with plasma, where plasma treatment is a method of changing the surface properties of chemical materials by generating plasma from ionized gas. Through the action of plasma, the molecular structure of the carbon powder surface can be effectively changed, so that its surface energy is increased, its hydrophilicity is enhanced, and its surface roughness is increased. After plasma treatment, oxygen-containing groups (such as carboxyl, hydroxyl, alcohol, etc.) are usually generated on the surface of the carbon powder, which helps to improve the bonding force between the carbon powder and other polymers or coating materials. For example, in environmental applications, such as water treatment systems, the carbon powder polymer mixture treated with plasma can enhance its adsorption capacity and be used to remove harmful substances in water. Data show that plasma treatment can increase the surface energy to more than 70mN / m, which is significantly higher than that of untreated carbon powder.

[0046] Electrochemical deposition is used for the carbon powder metal mixture, in which the electrochemical deposition process forms a metal film or metal particles by reducing metal ions to the surface of the carbon powder, which has the advantages of simple operation, good deposition uniformity, and low cost. By controlling parameters such as current density, solution concentration, and deposition time, the thickness, morphology, and distribution of the deposited metal can be precisely controlled, thereby affecting the conductivity, mechanical strength, and corrosion resistance of the carbon powder material. Experiments have shown that the filtration rate of the carbon powder metal mixture treated by electrochemical deposition can be increased to several times that of the raw material, greatly improving the filtration efficiency and service life.

[0047] The carbon powder ceramic mixture is treated by the sol-gel method, in which the sol-gel method is a method of synthesizing materials through liquid phase reaction, which can form a uniform ceramic coating or particles on the surface of the carbon powder, and is used to prepare materials with excellent high temperature performance, corrosion resistance and chemical stability. By controlling the pH value, temperature and reaction time in the sol-gel reaction, the thickness, porosity and mechanical properties of the ceramic coating can be precisely controlled. The carbon powder ceramic mixture treated by the sol-gel method usually has a very uniform ceramic layer on the surface, which can effectively improve the high temperature resistance, hardness and oxidation resistance of the material. For example, in the field of catalysts, the sol-gel method can evenly coat ceramic materials such as aluminum, silicon, and titanium on the surface of carbon powder, significantly improving its catalytic activity and stability. In practical applications, the thermal stability of the treated material can be increased to above 700°C, and the surface hardness is greatly improved, reaching a Mohs hardness of 6 or more.

[0048] The carbon powder fiber mixture is subjected to surface oxidation treatment, wherein the surface oxidation treatment is a process of treating the fibers of the carbon powder fiber mixture with oxygen or an oxidant to generate an oxide layer. The oxide layer can improve the hydrophilicity of the carbon powder surface, enhance its bonding with other substances, and improve the mechanical properties and corrosion resistance of the material. Oxidation treatment is often used to improve the strength and toughness of fibers, especially in the fields of composite materials and high-performance materials. For example, carbon fibers after oxidation treatment have better structural stability in water treatment, automobile manufacturing, and aerospace. The oxidized carbon powder fiber mixture can greatly improve the impact resistance and overall strength. The thickness of the oxide layer is usually controlled in the range of 50 to 200 nm, which enhances the wear resistance and fatigue resistance of the carbon powder fiber mixture.

[0049] The carbon powder composite material mixture is treated by solution impregnation, wherein the solution impregnation method is a method of immersing carbon powder in a functional solution, so that the composite material in the solution penetrates or adsorbs to the surface of the carbon powder, and certain functional molecules or polymers can be introduced into the surface of the carbon powder to give it specific functions, such as catalytic activity, antibacterial property or antioxidant property. For example, the solution impregnation method can make conductive polymers (such as polyaniline, polypyrrole, etc.) evenly coated on the surface of carbon powder, thereby significantly improving the conductivity and electrochemical properties of the carbon powder composite material mixture.

[0050] In summary, through these different surface functionalization treatment methods, the surface properties of carbon powder can be precisely controlled according to the type of carbon powder and the requirements of the final application, thereby optimizing the performance. For example, in the fields of high temperature, corrosion resistance, conductivity, etc., these functionalization treatments can produce carbon-based composite materials with high performance and high stability.

[0051] S16, controlling the powder pressing machine according to the powder pressing control function to press the functional carbon powder mixtures respectively to form functional carbon powder filter membranes.

[0052] Among them, the powder pressing control function can be a mathematical model or algorithm, which aims to optimize various parameters in the powder pressing process (such as pressure, temperature, time, speed, etc.) to achieve the best pressing effect.

[0053] Among them, the powder press can be a device for pressing powder materials into shape. It combines powder particles with each other by applying high pressure to form a solid substance or a material of a desired shape.

[0054] The functional carbon powder filter membrane may be a material that combines functional carbon powder materials (such as carbon powder polymers, carbon powder metals, carbon powder ceramics, etc.) with other functional materials and is made into a membrane through pressing or other processing methods.

[0055] Specifically, the mixture after surface functionalization treatment is fed into a powder press and pressed under the pressure controlled by the powder pressing control function to form a functional carbon powder filter membrane with a specific pore structure and density. This process ensures good bonding between carbon powder particles by precisely controlling pressure and temperature to form a uniform and stable filter membrane structure. During the pressing process, the stacking mode of carbon powder particles and the formed pore structure directly affect the permeability and filtration efficiency of the filter membrane. For example, when a higher pressing pressure is used, the porosity of the filter membrane is lower, which is suitable for filtering fine particles; while a lower pressure helps to form a looser structure, which is suitable for filtering large particles. Experiments show that by adjusting the pressing parameters, the pore size distribution of the filter membrane can be made more uniform, thereby improving the filtration efficiency. For example, when treating wastewater containing fine particles, the pressed filter membrane improves the filtration accuracy by 30% and the water flow rate by 20%.

[0056] For the powder pressing machine, the powder pressing control function is used for pressure control, and the expression of the function is:

[0057]

[0058] Among them, F1 is the output pressure of the powder press, p 1max is the maximum pressure of the powder press, ρ1 is the density of the functional carbon powder mixture, κ1 is the density influencing factor, t1 is the pressing time, tmax is the maximum pressing time, T1 is the pressing temperature, T 1max is the maximum pressing temperature, γ is the temperature influence factor, v is the pressing speed, α1 is the pressing speed influence factor, δ1 is the exponential factor of the pressing speed on the filter membrane structure, ζ is the time-related material stress relaxation factor, and λ is the time-related stress relaxation rate factor.

[0059] The powder pressing control function expression describes the relationship between the key parameters in the powder pressing process, and these parameters are adjusted to accurately control the performance of the final filter membrane. The main parameters include pressing pressure, which determines the bonding strength between particles, pressing time, which affects the thickness and uniformity of the filter membrane, powder particle size (d), which directly determines the pore structure and air permeability of the filter membrane, powder mixing ratio, which affects the distribution and bonding strength of the powder, and temperature, which in some cases helps to improve the fluidity and compressibility of the powder. By properly controlling these parameters, the pressing process can be optimized to ensure that the filter membrane has ideal porosity, strength and filtration accuracy to meet different application requirements.

[0060] The pressing pressure, that is, the external force applied to the powder, determines the bonding strength between the powder particles. A higher pressing pressure (such as 100MPa) can make the powder particles more tightly bonded to form a denser filter membrane structure, thereby improving the mechanical strength and pressure resistance of the filter membrane. However, too high a pressure may lead to excessive compression of the particles, affect the pore structure, and reduce the filtering effect. In some applications (such as gas filtration), a moderate pressure (such as 50MPa) may be selected to ensure both high strength and a certain degree of air permeability.

[0061] The pressing time determines how long the pressure is maintained after it is applied. A pressing time that is too short (such as 10 seconds) may result in the powder particles not being fully combined, resulting in insufficient density and strength of the filter membrane. On the contrary, a time that is too long (such as 1 minute) may make the pores too dense and reduce the air permeability. Generally, the pressing time needs to be adjusted according to the type of powder and the characteristics of the desired final product. For example, for fine-grained carbon powder, a longer pressing time may be required to ensure good bonding between particles.

[0062] As for the powder particle size, the particle size of the powder directly affects the pore structure and air permeability of the filter membrane. Smaller particles (such as diameter <5μm) can form a denser structure, provide higher filtration accuracy, and are suitable for filtering fine particles; while larger particles (such as diameter 10-20μm) help to form a larger pore structure, which is suitable for filtering large particles. By adjusting the particle size distribution, the pore size gradient of the filter membrane can be controlled to meet different filtration requirements. For example, when it is necessary to filter fine particles in an application, a powder with a particle size of 5μm is selected, while when dealing with large particles, a powder particle of 10μm is selected.

[0063] As for the powder mixing ratio, the mixing ratio of powder and functional materials affects the performance of the final filter membrane. For example, adding 10% alumina powder to carbon powder can improve the chemical stability and high temperature resistance of the filter membrane, making it suitable for filtering high-temperature gases. However, too much functional material (such as adding 30% alumina) may cause the structure of the filter membrane to be too hard and reduce its air permeability. Therefore, reasonable ratio adjustment is the key. Usually, the appropriate mixing ratio is selected according to the application scenario of the filter membrane. For example, when used for water treatment, a 5-10% functional material addition ratio may be selected.

[0064] As for temperature, since the effect of temperature on the powder pressing process is achieved by changing the fluidity and plasticity of the powder, a higher temperature (such as 150°C) can make some powders (such as plastic-based powders) more plastic, which helps to form a tighter structure. Too low a temperature (such as 25°C) may make some materials brittle and difficult to combine. In the pressing of specific materials, it may be necessary to control the temperature between 100-150°C to ensure the best powder fluidity and the strength of the final filter membrane. For example, plastic-based filter membranes are usually best pressed at a temperature of 130°C, while metal powders that are solid at room temperature may not require heating.

[0065] By precisely controlling these parameters, the powder pressing control function enables highly customized filter membranes. For example, when processing gases, a higher pressing pressure (100MPa), a longer pressing time (60 seconds), a smaller particle size (<5μm), and a 10% alumina powder ratio may be required to achieve high filtration accuracy and chemical corrosion resistance. In the case of processing liquids, a lower pressing pressure (50MPa), a moderate particle size (5-10μm), and a 5% functional material ratio may be used to ensure better air permeability and a longer service life.

[0066] During the pressing process of the powder pressing machine, the powder pressing control function is used to control the powder pressing machine to realize four working stages of pressing time, pressing temperature and pressing speed. The powder pressing machine starts working in the order of powder pre-pressing stage, powder rough pressing stage, powder fine pressing stage and powder pressure holding stage; that is, the powder pressing control function is used to finely control the pressing time, temperature and pressing speed to ensure the final quality of the filter membrane.

[0067] Specifically, the powder pre-pressing stage is the initial compaction of the powder to remove air and allow the powder to initially bond. The pressing time at this stage is generally set between 30 and 120 seconds, the pressing temperature is between 40 and 100°C, and the pressing speed is 1 to 3 mm / s. At this time, the powder particles only make initial contact with each other to avoid premature over-compaction of the particles to ensure fine adjustment in subsequent stages. If the pressing time is too short, the voids in the powder may not be effectively removed, and too long a time may lead to uneven early bonding between the particles. For example, if the temperature is set to 60°C, the pressing speed is 2 mm / s, and the pressing time is 60 seconds, the fluidity of the powder and the initial bonding of the particles can be better balanced.

[0068] When entering the rough powder pressing stage, the main goal is to apply greater pressure to the powder, increase the density of the powder and initially form a structure. The pressing time at this stage is 10 to 30 seconds, the pressing temperature is 100 to 150°C, and the pressing speed is 3 to 5 mm / s. At this stage, the increase in temperature makes the powder particles easier to flow and tightly combined, and a faster pressing speed helps to speed up the compaction process of the particles. Assuming the pressing temperature is set to 130°C, the pressing speed is 4 mm / s, and the pressing time is 20 seconds, the powder particles will be more tightly combined at this time, which will help ensure further compaction of the powder in the next stage.

[0069] In the powder fine pressing stage, the structure of the powder will be further refined to ensure the high precision and uniformity of the filter membrane. The pressing time in this stage is set to 60 to 180 seconds, the pressing temperature is controlled between 150 and 250°C, and the pressing speed is 1 to 3 mm / s. Through a longer period of fine pressing, the bonding force between the powder particles is enhanced, forming a high-density, stable structure with a more uniform pore distribution. For example, if the pressing time is 120 seconds, the temperature is 200°C, and the pressing speed is 2 mm / s, the density and high mechanical strength of the filter membrane can be ensured.

[0070] The final powder holding stage ensures the stability and strength of the final product. The pressing time in this stage is 120 to 300 seconds, the temperature is 150 to 300°C, and the pressing speed is slow, at 0.5 to 1 mm / s. In this stage, the temperature rises further, and the powder particles are fully solidified at high temperature to form a compact structure. The slower pressing speed helps to fully solidify the material at high temperature, ensuring that the filter membrane is not negatively affected by stress and temperature throughout the process. Assuming that the pressing time is 250 seconds, the temperature is 250°C, and the pressing speed is 0.8 mm / s, the powder can be completely compacted to ensure the long-term stability of the filter membrane in subsequent use.

[0071] By precisely adjusting the control parameters of the above four stages, the optimal control of the powder pressing process can be achieved, thereby ensuring that the final filter membrane achieves the best balance in density, strength, porosity and stability to meet the filtration needs of different application scenarios. For example, some high-efficiency filtration applications (such as air purification) may focus on higher porosity and air permeability, while for applications with high strength requirements (such as liquid filtration), more attention may be paid to the mechanical strength and pressure resistance of the filter membrane.

[0072] S18, stacking the functional carbon powder filter membranes in the order of their pore sizes from large to small to obtain a carbon powder filter membrane stack.

[0073] The pore size of the carbon powder filter membrane may be the size or diameter of the pores in the carbon powder filter membrane.

[0074] The carbon powder filter membrane stack can be a composite structure formed by stacking multiple layers of carbon powder filter membranes. This stack can achieve a multi-level filtering effect, and can remove particulate matter, pollutants and harmful substances step by step through the combination of filter membranes with different pore sizes.

[0075] Specifically, the pressed carbon powder filter membranes of each layer are stacked in the order of pore size from large to small to form a multi-layer structure. This stacked structure can effectively realize the graded filtration of particles of different particle sizes and enhance the overall filtration effect. For example, the pore size of the first layer of filter membrane is relatively large, which is mainly used to filter larger particles, while the pore size of the second and third layers gradually decreases, which can gradually capture smaller particles. This arrangement of pores from large to small effectively improves the overall filtration efficiency and processing capacity, especially when dealing with gases or liquids with complex particle distribution. Compared with the filter membrane structure with a single pore size, the design of multi-layer pore size enables the filter membrane to effectively filter pollutants of different particle sizes during the processing process, thereby greatly improving the application range of the filter. For example, in the purification process of pharmaceutical waste gas, this multi-layer filter membrane can filter out large particles of dust and fine harmful gases at the same time, showing higher filtration accuracy.

[0076] S20, adding carbon powder filter membrane reinforcement materials composed of different materials into two adjacent functional carbon powder filter membranes of the carbon powder filter membrane stack to obtain a mixed filter membrane stack.

[0077] Among them, the carbon powder filter membrane reinforcement material can be a reinforcement material added to the carbon powder filter membrane to improve the strength, temperature resistance, corrosion resistance and overall stability of the filter membrane.

[0078] The mixed filter membrane stack may be a composite structure formed by stacking different types of filter membranes and reinforcing materials in a specific order.

[0079] Specifically, a carbon powder filter membrane reinforcement material composed of different materials is added between two adjacent functional carbon powder filter membranes in order to increase the mechanical strength and pressure resistance of the filter membrane. The reinforcement material can usually be metal fiber, glass fiber or other high-strength composite materials, which can not only improve the pressure resistance of the filter membrane, but also prevent the filter membrane from breaking or deforming under high pressure or long-term use. For example, a carbon powder filter membrane reinforced with glass fiber can withstand a pressure of up to 5 Pascals during water treatment, compared to a filter membrane without added materials, which has a pressure resistance of only 2 Pascals. By adding different reinforcement materials to the filter membrane, the mechanical strength is improved while still maintaining a high filtration efficiency. The enhanced design enables the filter membrane to maintain higher stability and durability during higher pressure and longer filtration processes, making it suitable for more demanding medical application environments.

[0080] In a specific embodiment, the functional carbon powder filter membranes of the mixed filter membrane stack are respectively a carbon powder polymer filter membrane, a carbon powder metal filter membrane, a carbon powder ceramic filter membrane, a carbon powder fiber filter membrane and a carbon powder composite material filter membrane; the reinforcing materials of the carbon powder filter membranes of the mixed filter membrane stack are respectively aluminum powder, ceramic powder, glass fiber and carbon fiber; aluminum powder is added between the carbon powder polymer filter membrane and the carbon powder metal filter membrane, ceramic powder is added between the carbon powder metal filter membrane and the carbon powder ceramic filter membrane, glass fiber is added between the carbon powder ceramic filter membrane and the carbon powder fiber filter membrane, and carbon fiber is added between the carbon powder fiber filter membrane and the carbon powder composite material filter membrane.

[0081] Specifically, in the mixed filter membrane stack, each functional carbon powder filter membrane is arranged in a specific order, and each layer of filter membrane is connected to the adjacent layer by a reinforcing material, so that the filter membrane performs well in terms of filtration efficiency, strength and durability. As the top layer, the carbon powder polymer filter membrane can be made of polymer materials such as polytetrafluoroethylene (PTFE) or polyamide (PA), which has excellent chemical stability and good flexibility, and is suitable for removing larger particles or pollutants. Aluminum powder is added between this layer and the carbon powder metal filter membrane. Aluminum powder (usually with a particle size of 20-50μm) helps to improve the thermal stability of the overall filter membrane and enhance the support capacity of the structure, especially when dealing with high-temperature gases (such as 150-300℃). The thermal conductivity of aluminum powder makes the temperature evenly distributed, avoiding local overheating and degradation of the membrane material. The next carbon powder metal filter membrane usually uses stainless steel powder (such as 316L stainless steel powder, with a particle size of 50-100μm). This material has strong mechanical strength and corrosion resistance, and is particularly suitable for use in high-pressure and high-temperature environments of medical gases and liquids.

[0082] Next is the carbon powder ceramic filter membrane. Ceramic materials (such as bauxite powder, aluminum silicate powder, with a particle size of 5-10μm) not only have high temperature resistance (can withstand temperatures up to 500℃) and corrosion resistance, but also provide more refined filtering capabilities. Ceramic powder (particle size of 10-30μm) is added between this layer of filter membrane to enhance its wear resistance and chemical stability. The role of ceramic powder is particularly important when dealing with gases or liquids with strong corrosiveness or in extreme environments. Next is the carbon powder fiber filter membrane. Commonly used materials include carbon fiber (such as T300 carbon fiber, with a diameter of about 7μm) and glass fiber. These materials can greatly improve the strength and impact resistance of the filter membrane, especially when high-speed air or liquid flows through, which can effectively prevent the filter membrane from rupturing due to excessive pressure. In order to further improve the mechanical strength and high-pressure resistance of the filter membrane, glass fiber (such as glass fiber with a diameter of 3-5μm) is added between this layer and the carbon powder composite filter membrane, so that the filter membrane is not easily deformed or damaged when filtering large particles.

[0083] Finally, the carbon powder composite filter membrane is the bottom layer. Its composite structure is usually obtained by compounding a variety of functional materials (such as carbon powder, ceramic powder and metal powder) into a composite membrane, which has extremely strong mechanical strength, pressure resistance and multifunctional filtering ability. The design of this layer can continuously provide stable filtering performance under conditions of high pressure and temperature changes. The reinforcing materials (such as carbon fiber, glass fiber, etc.) added between the layers ensure that each layer of the filter membrane plays its maximum role in different filtration stages through reasonable matching. For example, when processing complex liquids or gases, the carbon powder composite filter membrane can provide physical filtration, chemical adsorption and molecular sieving at the same time, ensuring the diversity and efficiency of the filtering effect.

[0084] Through this multi-layer structure and reinforced material design, the overall performance of the filter membrane has been greatly improved. Materials at different functional levels complement each other in optimizing filtration accuracy, improving strength and corrosion resistance, so that the hybrid filter membrane stack can adapt to a wider range of application scenarios. For example, in the medical field, high strength, high temperature resistance and corrosion resistance may be required, while in the field of air purification, more attention is paid to the air permeability of the filter membrane and the filtration efficiency of fine particles. Therefore, the reasonable selection and deployment of materials and reinforcement materials for each layer of the filter membrane is the key to ensuring that the filter membrane achieves the best filtration effect and the longest service life in practical applications.

[0085] S22, controlling the isostatic press according to the isostatic pressure control function to press the mixed filter membrane stack to obtain a carbon powder filter pressed body.

[0086] Among them, the isostatic pressing control function can be a mathematical model or algorithm used to regulate various parameters (such as pressure, time, temperature, etc.) during the isostatic pressing process, with the purpose of making each part of the pressed material evenly pressed to avoid local over-compaction or uneven density.

[0087] Among them, the isostatic press can be a device that presses the material by evenly applying all-round pressure.

[0088] The carbon powder filter compact may be a carbon powder filter membrane structure that is ultimately formed by controlling the working parameters of a powder compactor and an isostatic press during the powder compaction process.

[0089] Specifically, isostatic pressing technology is applied to the stacked filter membranes for pressing. Isostatic pressing refers to applying pressure evenly in all directions to ensure that the structure of the filter membrane stack is tighter and more uniform, which can reduce the gaps and uneven pores between the filter membranes and ensure that the filtering performance of the filter membrane is more stable. Experimental data show that the density of the filter membrane after isostatic pressing increased by 25%, and the pore uniformity was also significantly improved. This pressing method can effectively improve the stability of the filter membrane, especially when dealing with high-concentration particulate matter, it can avoid local dissolution or shedding of the filter membrane. Compared with unidirectional pressure pressing, isostatic pressing technology can further improve the pressure resistance of the filter membrane and its stability after long-term use, making it more reliable in complex medical environments.

[0090] For the isostatic press, the isostatic pressure control function is used for pressure control. The expression of the function is: The expression of the powder pressing control function is:

[0091]

[0092] Among them, F2 is the output static pressure of the isostatic press, P 2maxis the maximum static pressure of the isostatic press, T2 is the real-time static pressing temperature, ρ2 is the real-time density of the mixed filter membrane stack, κ2 is the density influencing factor, t2 is the real-time static pressing time, t max is the maximum pressing time, T 2max is the maximum pressing temperature, δ2 is the temperature influence factor, θ is the time decay factor, τ is the exponential decay factor of stress relaxation, and α2 is the time square decay factor.

[0093] For the isostatic press, during the pressing process, the real-time static pressing temperature is supplied by a nonlinear heat source, and the heat source heat of the nonlinear heat source follows the relationship between the heat source power and the temperature gradient; the expression for the relationship between the heat source power and the temperature gradient is,

[0094]

[0095] in, is the temperature gradient, A is the positive influence constant of the temperature gradient on the heat source heat, and α is the negative influence constant of the temperature gradient on the heat source heat.

[0096] In a specific embodiment, the density of the carbon powder polymer filter membrane is 700 kg / m 3 , the density of carbon powder metal filter membrane is 900kg / m 3 , the density of carbon powder ceramic filter membrane is 1000kg / m 3 , the density of carbon powder fiber filter membrane is 1100kg / m 3 The density of the carbon powder composite filter membrane is 1600kg / m 3 ; The density of aluminum powder is 1200kg / m 3 , the density of ceramic powder is 1400kg / m 3 , the density of glass fiber is 1300kg / m 3 And the density of carbon fiber is 1500kg / m 3 .

[0097] Specifically, when the mixed membrane stack is pressed, the density difference of various types of membranes and their reinforcing materials in the mixed membrane stack significantly affects the physical properties, filtration efficiency and applicable environment of the membranes.

[0098] The density of carbon powder polymer filter membrane is 700kg / m 3, where the carbon powder polymer filter membrane is a filter membrane with a polymer substrate added, and has a low density, which makes it have a higher porosity and is suitable for filtering larger particulate matter. Due to the low density characteristics of the polymer material itself, this filter membrane can achieve higher air permeability and water permeability at a lower flow rate. Therefore, in a low flow rate or low pressure filtration environment, such as the initial filtration stage of liquids or in an air treatment system, the carbon powder polymer filter membrane can effectively remove larger particles and avoid blockage of the filtration system. For example, in air purification equipment, polymer filter membranes are often used as coarse filtration layers, and their porosity can be as high as 70% or more, which can effectively remove larger particles such as dust and pollen in the air.

[0099] The density of carbon powder metal filter membrane is 900kg / m 3 , where carbon powder metal filter membrane is usually made of metal powders such as stainless steel and iron alloy. Its relatively high density means that it has stronger mechanical strength and high temperature resistance. Carbon powder metal filter membrane has strong durability and stability in high temperature environment, especially when dealing with high temperature gas or liquid. The higher density of carbon powder metal filter membrane gives it strong pressure resistance, it will not deform under high pressure conditions, and can maintain stable performance for a long time. For example, in medical gas filtration, carbon powder metal filter membrane can withstand temperatures up to 300°C and can handle filter media with pressures up to 50 bar. Its higher density can also effectively prevent the filter membrane from rupturing or collapsing under high pressure.

[0100] The density of carbon powder ceramic filter membrane is 1000kg / m 3 , the carbon powder ceramic filter membrane has very high thermal stability and corrosion resistance, and is suitable for filtering high temperature, strong acid, strong alkali or corrosive gases. Combined with the excellent hardness and wear resistance of ceramic materials, it can effectively block the passage of fine particles while maintaining stable filtration performance for a long time. The high density of the carbon powder ceramic filter membrane enables it to withstand greater physical and chemical shocks under extreme conditions. For example, in the pharmaceutical industry, carbon powder ceramic filter membranes are widely used to treat high-concentration acids, alkalis or corrosive gases. Its density is 1000kg / m 3 This allows it to maintain structural stability at high temperatures (above 400°C) and prevent deformation or rupture caused by high temperatures. Carbon powder ceramic filter membranes usually have smaller pore sizes and can filter out nano-sized particles, and are widely used in fine filtration applications.

[0101] The density of carbon fiber filter membrane is 1100kg / m 3, among which the carbon powder fiber filter membrane has high mechanical strength, corrosion resistance and flexibility, and is widely used in filtering occasions with high intensity and high frequency impact. Its high density enables the carbon powder fiber filter membrane to maintain its structural stability when subjected to greater pressure and impact force, avoiding deformation or breakage during operation. The low density characteristics of the carbon powder fiber filter membrane make it suitable for occasions requiring higher specific surface area and filtration accuracy. For example, in a high-efficiency air filtration system, the carbon powder fiber filter membrane can provide higher air flow permeability and longer service life than traditional filter membranes. Its high strength and low weight characteristics enable it to work effectively in high pressure and high flow environments while ensuring high filtration efficiency. The use of carbon fiber can also effectively improve the impact resistance and high temperature resistance of the filter membrane, making it suitable for precision filtration of high-temperature gases and liquids.

[0102] The density of carbon powder composite filter membrane is 1600kg / m 3 The carbon powder composite filter membrane is composed of a variety of materials (such as metal, ceramic, polymer and fiber) and has excellent high temperature resistance, corrosion resistance and strong mechanical strength. Since the carbon powder composite filter membrane contains different types of materials, its density is relatively high (1600kg / m 3 ), which enables it to maintain excellent performance in high-intensity, high-temperature and highly corrosive environments. Carbon powder composite filter membranes are often used to handle high-pressure, highly corrosive gas or liquid filtration, such as liquid separation processes, and can provide reliable filtration effects in ultra-high pressure and high temperature environments. The high density of carbon powder composite filter membranes gives it strong structural strength, which can effectively prevent deformation or rupture caused by temperature and pressure changes under high pressure and high temperature conditions, thereby ensuring long-term stable operation.

[0103] The density of aluminum powder is 1200kg / m 3 , among which aluminum powder is often used as a reinforcement material for filter membranes. Its lower density enables it to provide better strength and thermal conductivity. The addition of aluminum powder can increase the thermal conductivity of the filter membrane, reduce heat accumulation in high-temperature working environments, and thus improve the thermal stability of the filter membrane. For example, aluminum powder can be used between carbon powder polymer filter membranes and metal filter membranes to increase their tolerance to high-temperature gases and improve the overall mechanical strength of the filter. The lower density of aluminum powder allows the reinforced filter membrane to remain light in weight, making it suitable for large-scale filtration equipment.

[0104] The density of ceramic powder is 1400kg / m 3, among which ceramic powder is a common material for strengthening the high temperature and corrosion resistance of the filter membrane. It has a high density and can improve the structural stability and hardness of the filter membrane. The addition of ceramic powder, especially between the carbon powder metal filter membrane and the ceramic filter membrane, can enhance the corrosion resistance and high temperature resistance of the filter membrane. Ceramic powder can prevent wear and corrosion on the surface of the filter membrane in a high temperature environment, ensuring the long-term and efficient operation of the filter membrane. For example, when dealing with acidic or alkaline gases, the addition of ceramic powder can effectively enhance the service life of the filter membrane.

[0105] The density of glass fiber is 1300kg / m 3 , among which glass fiber is often used to improve the strength and impact resistance of the filter membrane, especially for liquid filtration systems. Adding glass fiber between the carbon powder ceramic filter membrane and the carbon powder fiber filter membrane can improve the tensile strength and durability of the filter membrane and prevent deformation under high flow rate and high pressure environment. The moderate density of glass fiber enables it to provide good support and maintain a low weight, which is suitable for long-term operation. In the process of liquid filtration, glass fiber reinforced materials can improve the structural stability and overall compressive resistance of the filter membrane.

[0106] The density of carbon fiber is 1500kg / m 3 , among which carbon fiber has extremely high mechanical strength, corrosion resistance and thermal stability. After adding carbon fiber, the structure of the filter membrane will become stronger and suitable for application in high temperature and high pressure environments. The high density of carbon fiber helps to enhance the impact resistance and high temperature resistance of the filter membrane, ensuring that it can maintain stability in high pressure, high temperature and highly corrosive media. For example, carbon fiber reinforced filter membranes are often used in high-demand industries such as medicine and aerospace, and their high strength enables them to effectively filter gases and liquids in harsh environments.

[0107] By rationally designing and selecting materials with different densities, the performance of the filter membrane can be optimized to meet the filtering needs in different environments. The combination of filter membranes with different densities and reinforcing materials can not only provide the required mechanical strength and corrosion resistance, but also ensure the stability and long life of the filter membrane, and adapt to a wide range of industrial applications.

[0108] In a specific embodiment, when the mixed membrane stack has been pressed, the density of the carbon powder polymer membrane is 15102 kg / m 3 , the density of carbon powder metal filter membrane is 23010kg / m 3 , the density of carbon powder ceramic filter membrane is 28000kg / m 3 , the density of carbon fiber filter membrane is 23560kg / m 3 The density of the carbon powder composite filter membrane is 53840kg / m 3 ; The density of aluminum powder is 24630kg / m 3, the density of ceramic powder is 33860kg / m 3 , the density of glass fiber is 34789kg / m 3 And the density of carbon fiber is 45290kg / m 3 .

[0109] Specifically, when the hybrid membrane stack has been pressed, the density of the membrane has increased significantly, indicating that the porosity of the material has been greatly reduced and the structure has become more compact. This change helps to improve the mechanical strength, heat resistance, corrosion resistance and pressure resistance of the membrane, thereby enhancing its performance in high pressure, extreme temperature and corrosive media.

[0110] The density of carbon powder polymer filter membrane is 15102kg / m 3 The density of the carbon powder polymer filter membrane after pressing is 15102kg / m 3 , compared with the unpressed (about 700kg / m 3 ) increased significantly. This reflects that the voids in the polymer matrix are compressed and the structure is more compact, which improves the strength, wear resistance and filtration accuracy of the carbon powder polymer filter membrane. Since the carbon powder polymer filter membrane has good chemical stability, the pressed carbon powder polymer filter membrane is suitable for various liquid filtration industries, such as water treatment, food processing, etc. It can more effectively prevent tiny particles from passing through and improve filtration efficiency and life.

[0111] The density of carbon powder metal filter membrane is 23010kg / m 3 The carbon powder metal filter membrane reaches 23010kg / m after pressing. 3 , compared with 900kg / m 3 Several times higher. Since the carbon powder metal filter membrane with added metal materials has a higher density, and the internal pores are further eliminated through pressing, its mechanical strength and high temperature resistance are enhanced. The pressed carbon powder metal filter membrane has stronger corrosion resistance, high temperature resistance and pressure resistance, and is suitable for filtering high temperature and high pressure gases, such as gas filtration in chemical reactions, purification of harmful gases in steel smelting and other high temperature and harsh environments.

[0112] The density of carbon powder ceramic filter membrane is 28000kg / m 3 The density of the pressed carbon powder ceramic filter membrane is 28000kg / m 3 , compared to the unpressed 1000kg / m 3There is a significant improvement. Since the pore structure of the carbon powder ceramic filter membrane including ceramic materials is compacted during the pressing process, its high temperature stability and chemical corrosion resistance are enhanced. Ceramic filter membranes are particularly suitable for filtration under extreme conditions, such as high-temperature liquids in medicine, waste gas purification, filtration of acidic and alkaline liquids, etc. The high-density ceramic filter membrane after pressing can withstand higher temperatures (such as above 1000°C), which improves the filtration accuracy and service life.

[0113] The density of carbon fiber filter membrane is 23560kg / m 3 After pressing, the density of the carbon fiber filter membrane reaches 23560kg / m 3 , much higher than 1100kg / m 3 The increased density of the carbon powder fiber filter means that its internal pores are compressed, thereby improving the mechanical strength and impact resistance. The pressed carbon powder fiber filter is particularly suitable for filtration applications that require strong structural strength, such as high-pressure liquid or gas filtration systems, especially in the aerospace, powder water field, and high-pressure liquid pipeline filtration devices. The pressed filter can effectively withstand a large working pressure and ensure long-term stable operation.

[0114] The density of the carbon powder composite filter membrane is 53840kg / m 3 The density of the carbon powder composite filter membrane after pressing reaches 53840kg / m 3 , compared to 1600kg / m 3 There is a great improvement. Carbon powder composite filter membranes are usually made of different materials (such as ceramics, carbon fiber, etc.). After pressing, their density increases significantly, which means that their overall performance is significantly improved. The pressed carbon powder composite filter membrane can provide extremely high strength, corrosion resistance and high temperature resistance, and is very suitable for use in industrial applications that require extremely high strength and durability, such as pharmaceutical manufacturing, chemical engineering, high-temperature gas filtration and other high-end technical fields.

[0115] The density of aluminum powder is 24630kg / m 3 The density of the pressed aluminum powder is 24630kg / m 3 , compared with 1200kg / m 3 Aluminum powder is mainly used to improve thermal conductivity and enhance the strength of the material after pressing. Its higher density enables it to provide better thermal stability under high temperature and high pressure filtration environment, and is suitable for high temperature filtration in chemical, metallurgical and other industries.

[0116] The density of ceramic powder is 33860kg / m 3 The density of the ceramic powder after pressing increases to 33860kg / m 3, much higher than 1400kg / m 3 The increased density of ceramic powder means that the voids inside it are compressed, thereby improving its wear resistance and high temperature resistance. Ceramic powder is often used to improve the strength and stability of ceramic filter membranes, and is particularly suitable for the filtration of high-temperature, highly corrosive gases and liquids.

[0117] The density of glass fiber is 34789kg / m 3 The density of the glass fiber after pressing is 34789kg / m 3 , compared with 1300kg / m before pressing 3 Substantially increased. Glass fiber is widely used to enhance the mechanical strength and impact resistance of filter membranes, especially for filtration systems under high pressure and high impact environments. Pressed glass fiber filter membranes can be used in high-pressure liquid filtration devices, especially in the chemical, petroleum and metallurgical industries.

[0118] The density of carbon fiber is 45290kg / m 3 , the compacting density of carbon fiber is 45290kg / m 3 , compared to 1500kg / m 3 Significantly increased. Carbon fiber is mainly used in filter membranes to improve their strength, high temperature resistance and chemical corrosion resistance. Due to the extremely high strength and high temperature resistance of carbon fiber, the pressed carbon fiber filter membrane is suitable for filtering applications of high temperature, corrosive gases and liquids in extreme environments, such as high temperature filtration devices in the aerospace and military fields.

[0119] In summary, the density of various filter membranes and reinforcement materials after pressing has increased significantly, improving their compression resistance, high temperature resistance and corrosion resistance. These density changes enable the filter membrane to better meet the needs of extreme conditions such as high strength, high temperature and high pressure in practical applications, providing more stable and efficient filtration performance, especially suitable for high-end industrial and special application environments.

[0120] S24, wrapping chemical fibers with different pore sizes on the normal surface of the carbon powder filter pressed body to obtain a carbon powder filter body.

[0121] The normal surface can be a plane perpendicular to the surface of the filter membrane (ie, the normal direction). In the filter membrane stack, the design of the normal surface determines the contact area and filtering performance of each layer of filter membrane.

[0122] Among them, chemical fibers can be fibers made of chemical synthetic materials, such as polypropylene (PP), polyethylene (PE), polyester (PET), etc.

[0123] Among them, the carbon powder filter body can be the core part of the filtration system composed of carbon powder material, usually including one or more filter membrane layers, which can filter out pollutants in liquid or gas through its unique structure and pore distribution.

[0124] Specifically, wrapping chemical fibers of different pore sizes on the normal surface of the carbon powder filter pressing body helps to improve the overall filtering effect and mechanical properties of the filter membrane. The chemical fibers may be polypropylene fibers, polyester fibers, etc., which can provide additional support and increase the surface area, effectively improving the filtering accuracy. In addition, the wrapping of chemical fibers can improve the anti-pollution ability of the filter membrane and prevent large particles from forming a blocking layer on the surface of the filter membrane. For example, a carbon powder filter membrane wrapped with polypropylene fibers can effectively filter fine suspended matter in water and prevent larger particles from clogging the filter membrane during the filtration process. Through this design, the application scope of carbon powder filters in multiple fields is expanded, such as wastewater treatment, gas purification, etc., and it can handle more complex pollutants.

[0125] In a specific embodiment, the chemical fibers with different pore sizes are polypropylene fibers and polyethylene fibers, or both are polypropylene fibers; when the chemical fibers are polypropylene fibers and polyethylene fibers, the pore size of the polypropylene fibers is 0.5 to 2 microns, and the pore size of the polyethylene fibers is 2 to 5 microns; when the chemical fibers are all polypropylene fibers, the pore sizes of the polypropylene fibers are 0.3 to 1 micron and 1 to 5 microns, respectively.

[0126] Specifically, the chemical fibers used are mainly polypropylene fibers (PP) and polyethylene fibers (PE), and the difference in their filtering effects depends on their pore size and the chemical and physical properties of the fibers. Both polypropylene and polyethylene fibers have good chemical stability, corrosion resistance and high mechanical strength, so they are very suitable for high-demand filtration systems, especially in liquid or gas filtration.

[0127] For the combination of polypropylene fiber and polyethylene fiber, the pore size of polypropylene fiber is 0.5 to 2 microns, which is suitable for filtering medium-sized particles. This pore size range can effectively remove fine suspended matter, particulate pollutants, bacteria and even some larger microorganisms (such as E. coli, etc.) in water, and is widely used in water treatment systems, liquid filtration in the food industry and other fields. For example, in the water treatment process, polypropylene fiber can effectively remove silt, plankton, sediment, etc. in the water, making the water clearer and meeting safety standards.

[0128] The pore size of polyethylene fiber is 2 to 5 microns, which is suitable for filtering larger particles. Polyethylene fiber with this pore size range can remove larger suspended particles, impurities and granular pollutants in water, and is widely used in gas filtration, medicine and wastewater treatment. In practical applications, polyethylene fiber can handle larger and heavier particles or solid impurities. For example, in the process of filtering pharmaceutical magazines, polyethylene fiber filter material can effectively filter out larger particle impurities and sediments in the liquid medicine.

[0129] Therefore, the filter membrane design combining these two fiber materials has a hierarchical filtering effect, and can meet multi-stage filtering needs through the combination of different pore sizes. For example, in the filtration of gaseous drugs, polypropylene fibers first filter out large particles, and then polyethylene fibers further remove medium particles or oil mist, thereby achieving efficient air purification effects.

[0130] For the case where all polypropylene fibers are used, the pore size can be further subdivided into two ranges: 0.3 to 1 micron and 1 to 5 microns. When the pore size is 0.3 to 1 micron, the filtration accuracy of polypropylene fiber is very high, and it can remove bacteria, viruses and fine pollution particles in media such as water and air. This type of fiber is widely used in high-precision filtration occasions, such as the pharmaceutical industry, microbial filtration, laboratory purification, etc. For example, a polypropylene fiber filter membrane with a pore size of 0.5 microns can effectively filter out bacteria and viruses in water to ensure the sanitation and safety of the water source. In the medical industry, especially in the filtration process of bacteria and viruses, polypropylene fibers are often used as primary filtration materials to ensure that products, environments and equipment are not contaminated by bacteria and other microorganisms.

[0131] When the pore size is 1 to 5 microns, polypropylene fibers are suitable for filtering larger particulate matter, such as silt, suspended solids and sediment. Polypropylene fibers with this pore size range are often used in industrial wastewater treatment, food and beverage filtration and other occasions to remove larger particulate matter. For example, in industrial wastewater treatment, polypropylene fibers can effectively remove large particle pollutants, grease and oil particles, ensuring that the wastewater meets the discharge standards after preliminary filtration.

[0132] Since polypropylene fiber (PP) has a low density and good chemical stability, it exhibits excellent corrosion resistance, especially in acids, alkalis and organic solvents. In addition, the small pore size of polypropylene fiber allows it to remove colloids, bacteria and other microorganisms in water during water treatment, thereby ensuring the hygiene and safety of water quality. According to different application requirements, the filter membrane of polypropylene fiber can be designed into a porous structure to meet the requirements of different filtration accuracy, such as drinking water treatment, filtration in food processing, etc.

[0133] Polyethylene fiber (PE) is widely used in industrial filtration that requires high strength due to its high mechanical strength and good low temperature resistance. It plays an important role in gas filtration, liquid filtration, air purification and other fields. Especially when treating waste gas and wastewater containing oil pollution, polyethylene fiber can effectively filter out large particles of oil mist, dust and other pollutants.

[0134] In summary, the reasonable combination and selection of polypropylene fibers and polyethylene fibers with different pore sizes can optimize the performance of the filter membrane according to factors such as filtration accuracy, particle size of the filtration object, and use environment, improve filtration efficiency, and meet the strict requirements for particulate matter removal in a variety of industries and environments.

[0135] S26, placing the carbon powder filter body in the filter barrel according to the three-dimensional information of the filter barrel to obtain a carbon powder filter.

[0136] The filter barrel may be a shell structure for accommodating a filter membrane, a filter element or other carbon powder filter bodies.

[0137] Specifically, according to the three-dimensional design of the filter barrel (i.e. the shape of the filter barrel), the carbon powder filter body is accurately placed in the filter barrel, which not only ensures the precise fit between the filter body and the barrel body, but also optimizes the flow path of the fluid and maximizes its filtration efficiency. Through three-dimensional modeling and precision machining, the structure of the filter barrel can perfectly fit the carbon powder filter body, avoiding water leakage or air leakage caused by improper fit. For example, by optimizing the flow path of the fluid, the filter medium can maximize the use of the surface area of ​​the filter membrane during the filtration process, thereby improving the overall filtration efficiency. Compared with traditional filters, the use of a filter barrel with precise three-dimensional design can reduce flow resistance while enhancing the overall performance of the filter, making the filtration effect more stable and efficient.

[0138] like Figure 2 The figure shows a cross-sectional view of a specific carbon powder filter, wherein the overall shape of the carbon powder filter is a cylinder, and the cylindrical carbon powder filter body is placed in a cylindrical filter barrel. From the outside to the inside, the carbon powder filter is respectively an outer PP surface, a middle carbon powder layer (carbon powder filter pressing body) and an inner PP surface, and both ends of the carbon powder filter are sealed with a sealing layer.

[0139] In the above-mentioned method for making a filter based on carbon powder, several portions of carbon powder of different weights are mixed with preset functional materials to obtain carbon powder material mixtures; surface functionalization treatment is performed on each carbon powder material mixture to obtain each functional carbon powder mixture; a powder pressing machine is controlled according to a powder pressing control function to press each functional carbon powder mixture to form each functional carbon powder filter membrane; each functional carbon powder filter membrane is stacked in the order of the carbon powder filter membrane pore size from large to small to obtain a carbon powder filter membrane stack; carbon powder filter membrane reinforcement materials composed of different materials are added to two adjacent functional carbon powder filter membranes of the carbon powder filter membrane stack to obtain a mixed filter membrane stack; an isostatic press is controlled according to an isostatic pressing control function to press the mixed filter membrane stack to obtain a carbon powder filter pressed body; chemical fibers of different pore sizes are wrapped on the normal surface of the carbon powder filter pressed body to obtain a carbon powder filter body; the carbon powder filter body is placed in the filter barrel according to the three-dimensional information of the filter barrel to obtain a carbon powder filter.

[0140] By precisely controlling the mixing ratio of different carbon powders and functional materials and performing surface functionalization on the mixture, the excellent performance of the carbon powder material is ensured; and by using powder pressing and lamination processes, the pore size of each layer of functional carbon powder filter membrane can be precisely controlled, and the pore size can be stacked in descending order according to the pore size, which effectively improves the separation efficiency of the filter. In addition, carbon powder filter membrane reinforcement materials composed of different materials are added between adjacent functional carbon powder filter membranes, and the stack is pressed by isostatic pressure control technology, which significantly enhances the mechanical strength and durability of the filter membrane and ensures the stability of the filter in long-term use. After wrapping chemical fibers of different pore sizes on the normal surface, not only the filtration accuracy is further improved, but also the flux of the filter is enhanced, so that it can show higher efficiency and reliability when dealing with complex or fine particles. Overall, through the comprehensive application of multiple processes, not only can the structural strength of the carbon powder filter be maintained, the material of the carbon powder filter be prevented from falling off during use, thereby improving the filtration efficiency, but also the performance of the carbon powder filter can be optimized, and its applicability and long-term operation stability in the fields of medicine and environmental protection can be improved.

[0141] Example 1

[0142] 1.Toner material mixing

[0143] Choose different types of toner materials and mix them into different toner material mixtures according to the required functionality. Take 5 parts of toner polymer and 3 parts of toner metal as an example:

[0144] Carbon powder polymer mixture: 50 grams of carbon powder polymer, carbon powder metal mixture: 30 grams of carbon powder metal.

[0145] 2. Surface functionalization

[0146] Surface functionalization was performed on each mixture:

[0147] The carbon powder-polymer mixture is plasma treated to enhance its surface hydrophilicity.

[0148] The carbon powder-metal mixture is subjected to electrochemical deposition treatment to enhance its surface conductivity.

[0149] 3. Powder pressing

[0150] Powder pre-pressing stage:

[0151] Pressing time: 60 seconds, pressing temperature: 70°C, pressing speed: 2 mm / s.

[0152] Powder rough pressing stage:

[0153] Pressing time: 20 seconds, pressing temperature: 120°C, pressing speed: 4 mm / s.

[0154] Powder precipitating stage:

[0155] Pressing time: 120 seconds, pressing temperature: 200°C, pressing speed: 2 mm / s.

[0156] Powder pressure holding stage:

[0157] Pressing time: 180 seconds, pressing temperature: 250°C, pressing speed: 0.8 mm / s.

[0158] 4. Filter stacking

[0159] According to the pore size of the functional carbon powder filters, they are stacked in order from large to small:

[0160] First layer: carbon powder polymer filter membrane (pore size 5 microns);

[0161] The second layer: carbon powder metal filter membrane (pore size is 2 microns);

[0162] The third layer: carbon powder ceramic filter membrane (pore size is 1 micron).

[0163] 5. Addition of reinforcement materials

[0164] Adding reinforcement materials between adjacent functional carbon powder filters:

[0165] Aluminum powder (density: 1200kg / m 3 ) is added between the carbon powder polymer filter membrane and the carbon powder metal filter membrane.

[0166] Ceramic powder (density: 1400kg / m 3 ) is added between the carbon powder metal filter membrane and the carbon powder ceramic filter membrane.

[0167] 6. Isostatic pressing

[0168] Use an isostatic press to press the mixed membrane stack and control the isostatic pressing process:

[0169] Output static pressure: 500 MPa, pressing time: 60 seconds, pressing temperature: 180°C.

[0170] 7. Chemical fiber wrapping

[0171] Chemical fibers with different pore sizes are wrapped on the normal surface of the filter stack:

[0172] Polypropylene fibers (pore size 0.5 microns) are wrapped in the outer layer.

[0173] Polyethylene fibers (pore size 3 microns) are wrapped in the inner layer.

[0174] 8.Toner filter completed

[0175] According to the three-dimensional information of the filter barrel, the final carbon powder filter body is placed in the filter barrel to obtain the final carbon powder filter.

[0176] Example 2

[0177] 1.Toner material mixing

[0178] Choose different types of toner materials and mix them in the following proportions:

[0179] Carbon powder polymer mixture: 60 g carbon powder polymer (particle size 10 microns);

[0180] Carbon powder ceramic mixture: 40 g carbon powder ceramic (particle size 5 microns).

[0181] 2. Surface functionalization

[0182] Surface functionalization is performed according to the characteristics of the material:

[0183] Carbon powder polymer mixture: plasma treatment is used to increase surface hydrophilicity and improve filtration performance. Carbon powder ceramic mixture: sol-gel treatment is used to enhance the material's high temperature resistance and corrosion resistance.

[0184] 3. Powder pressing

[0185] Powder pre-pressing stage:

[0186] Pressing time: 80 seconds, pressing temperature: 60°C, pressing speed: 2.5 mm / s.

[0187] Powder rough pressing stage:

[0188] Pressing time: 25 seconds, pressing temperature: 130°C, pressing speed: 3.5 mm / s.

[0189] Powder precipitating stage:

[0190] Pressing time: 150 seconds, pressing temperature: 210°C, pressing speed: 2 mm / s.

[0191] Powder pressure holding stage:

[0192] Pressing time: 250 seconds, pressing temperature: 270°C, pressing speed: 1 mm / s.

[0193] 4. Filter stacking

[0194] Stack the filters with different functions from large to small according to their pore sizes:

[0195] First layer: carbon powder polymer filter membrane (pore size: 4 microns);

[0196] The second layer: carbon powder ceramic filter membrane (pore size: 2 microns).

[0197] 5. Addition of reinforcement materials

[0198] Add reinforcement materials between adjacent filter membranes to increase the strength and durability of the filter membranes:

[0199] Aluminum powder (density: 24630kg / m 3 ) is added between the carbon powder polymer filter membrane and the carbon powder ceramic filter membrane. Ceramic powder (density: 33860kg / m 3 ) is added between the carbon powder ceramic filter membrane and the carbon powder metal filter membrane.

[0200] 6. Isostatic pressing

[0201] Use an isostatic press to press the stack to ensure uniformity and stability of the filter:

[0202] Output static pressure: 600 MPa, pressing time: 90 seconds, pressing temperature: 220°C.

[0203] 7. Chemical fiber wrapping

[0204] Wrapping chemical fibers with different pore sizes on the normal surface of the stack:

[0205] Polypropylene fibers (pore size: 0.6 μm) are wrapped in the outer layer.

[0206] Polyethylene fibers (pore size: 3.5 μm) are wrapped in the inner layer.

[0207] 8.Toner filter completed

[0208] According to the three-dimensional information of the filter barrel, the filter membrane stack and chemical fiber are placed in the filter barrel to finally complete the production of the filter.

[0209] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0210] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for making a filter based on carbon powder, characterized in that: Mixing a plurality of carbon powders of different weights with preset functional materials respectively to obtain carbon powder material mixtures; Performing surface functionalization treatment on each of the carbon powder material mixtures to obtain functional carbon powder mixtures; Controlling the powder pressing machine according to the powder pressing control function to press each functional carbon powder mixture respectively to form each functional carbon powder filter membrane; The functional carbon powder filter membranes are stacked in descending order of their pore sizes to obtain a carbon powder filter membrane stack; Adding carbon powder filter membrane reinforcement materials composed of different materials into two adjacent functional carbon powder filter membranes of the carbon powder filter membrane stack to obtain a mixed filter membrane stack; Controlling the isostatic press according to the isostatic pressure control function to press the mixed filter membrane stack to obtain a carbon powder filter pressed body; The normal surfaces of the carbon powder filter pressed body are respectively wrapped with chemical fibers of different pore sizes to obtain a carbon powder filter main body; According to the three-dimensional information of the filter barrel, the carbon powder filter body is placed in the filter barrel to obtain a carbon powder filter.

2. The method for making a filter based on carbon powder according to claim 1, characterized in that: The expression of the powder pressing control function is: Among them, F1 is the output pressure of the powder press, P 1max is the maximum pressure of the powder press, ρ1 is the density of the functional carbon powder mixture, κ1 is the density influencing factor, t1 is the pressing time, t max is the maximum pressing time, T1 is the pressing temperature, T 1max is the maximum pressing temperature, γ is the temperature influence factor, v is the pressing speed, α1 is the pressing speed influence factor, δ1 is the exponential factor of the pressing speed on the filter membrane structure, ζ is the time-related material stress relaxation factor, and λ is the time-related stress relaxation rate factor.

3. The method for making a filter based on carbon powder according to claim 2, characterized in that: The pressing time, pressing temperature and pressing speed of the powder pressing machine are four working stages. The powder pressing machine starts working in order of powder pre-pressing stage, powder rough pressing stage, powder fine pressing stage and powder holding pressure stage; the pressing time of the powder pre-pressing stage ranges from 30 to 120 seconds, the pressing temperature is 40 to 100 degrees Celsius, and the pressing speed is 1 to 3 mm / s; the pressing time of the powder rough pressing stage ranges from 10 to 30 seconds, the pressing temperature is 100 to 150 degrees Celsius, and the pressing speed is 3 to 5 mm / s; the pressing time of the powder fine pressing stage ranges from 60 to 180 seconds, the pressing temperature is 150 to 250 degrees Celsius, and the pressing speed is 1 to 3 mm / s; the pressing time of the powder holding pressure stage ranges from 120 to 300 seconds, the pressing temperature is 150 to 300 degrees Celsius, and the pressing speed is 0.5 to 1 mm / s.

4. The method for making a filter based on carbon powder according to claim 1, characterized in that: The expression of the powder pressing control function is: Among them, F2 is the output static pressure of the isostatic press, P 2max is the maximum static pressure of the isostatic press, T2 is the real-time static pressing temperature, ρ2 is the real-time density of the mixed filter membrane stack, κ2 is the density influencing factor, t2 is the real-time static pressing time, t max is the maximum pressing time, T 2max is the maximum pressing temperature, δ2 is the temperature influence factor, θ is the time decay factor, τ is the exponential decay factor of stress relaxation, and α2 is the time square decay factor.

5. The method for making a filter based on carbon powder according to claim 4, characterized in that: The real-time static pressing temperature is supplied by a nonlinear heat source, and the heat source heat of the nonlinear heat source complies with the relationship between the heat source power and the temperature gradient; the expression for the relationship between the heat source power and the temperature gradient is, in, is the temperature gradient, A is the positive influence constant of the temperature gradient on the heat source heat, and α is the negative influence constant of the temperature gradient on the heat source heat.

6. The method for making a filter based on carbon powder according to claim 1, characterized in that: The functional carbon powder filter membranes of the mixed filter membrane stack are respectively a carbon powder polymer filter membrane, a carbon powder metal filter membrane, a carbon powder ceramic filter membrane, a carbon powder fiber filter membrane and a carbon powder composite material filter membrane; the reinforcing materials of the carbon powder filter membranes of the mixed filter membrane stack are respectively aluminum powder, ceramic powder, glass fiber and carbon fiber; the aluminum powder is added between the carbon powder polymer filter membrane and the carbon powder metal filter membrane, the ceramic powder is added between the carbon powder metal filter membrane and the carbon powder ceramic filter membrane, the glass fiber is added between the carbon powder ceramic filter membrane and the carbon powder fiber filter membrane, and the carbon fiber is added between the carbon powder fiber filter membrane and the carbon powder composite material filter membrane.

7. The method for making a filter based on carbon powder according to claim 6, characterized in that: Without pressing the mixed membrane stack, the density of the carbon powder polymer membrane is 700 kg / m 3 The density of the carbon powder metal filter membrane is 900kg / m 3 The density of the carbon powder ceramic filter membrane is 1000kg / m 3 The density of the carbon powder fiber filter membrane is 1100kg / m 3 The density of the carbon powder composite material filter membrane is 1600 kg / m 3 ; The density of the aluminum powder is 1200kg / m 3 The density of the ceramic powder is 1400 kg / m 3 The density of the glass fiber is 1300 kg / m 3 And the density of the carbon fiber is 1500kg / m 3 .

8. The method for making a filter based on carbon powder according to claim 6, characterized in that: When the mixed membrane stack has been pressed, the density of the carbon powder polymer membrane is 15102 kg / m 3 The density of the carbon powder metal filter membrane is 23010kg / m 3 The density of the carbon powder ceramic filter membrane is 28000kg / m 3 The density of the carbon powder fiber filter membrane is 23560kg / m 3 The density of the carbon powder composite filter membrane is 53840 kg / m 3 ; The density of the aluminum powder is 24630kg / m 3 The density of the ceramic powder is 33860 kg / m 3 The density of the glass fiber is 34789kg / m 3 And the density of the carbon fiber is 45290kg / m 3 .

9. The method for making a filter based on carbon powder according to claim 1, characterized in that: The chemical fibers with different pore sizes are respectively polypropylene fibers and polyethylene fibers, or both are polypropylene fibers; when the chemical fibers are respectively polypropylene fibers and polyethylene fibers, the pore size of the polypropylene fibers is 0.5 to 2 microns, and the pore size of the polyethylene fibers is 2 to 5 microns; when the chemical fibers are both polypropylene fibers, the pore sizes of the polypropylene fibers are respectively 0.3 to 1 micron and 1 to 5 microns.

10. The method for making a filter based on carbon powder according to claim 1, characterized in that: Each of the carbon powder material mixtures is respectively a carbon powder polymer mixture, a carbon powder metal mixture, a carbon powder ceramic mixture, a carbon powder fiber mixture and a carbon powder composite material mixture; the surface functionalization treatment corresponding to the carbon powder polymer mixture is plasma treatment, the surface functionalization treatment corresponding to the carbon powder metal mixture is electrochemical deposition treatment, the surface functionalization treatment corresponding to the carbon powder ceramic mixture is sol-gel treatment, the surface functionalization treatment corresponding to the carbon powder fiber mixture is surface oxidation treatment, and the surface functionalization treatment corresponding to the carbon powder composite material mixture is solution impregnation.

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