A dual-effect carbon-insulated cloth material and its preparation method

Abstract

This invention relates to a dual-effect carbon-coated cloth material and its preparation method, belonging to the field of air purification technology. The method includes the following steps: a layer of adhesive is laid flat on a support layer to form a first adhesive layer; then activated carbon I is evenly laid flat on the first adhesive layer, followed by another layer of adhesive to form a second adhesive layer; then activated carbon II is evenly laid flat on the second adhesive layer, followed by a layer of adhesive and meltblown fabric, to obtain the dual-effect carbon-coated cloth material. Compared with existing technologies, the alkali-modified hydrophilic activated carbon I in this invention significantly increases the removal of SO2 and NO from the gas to be purified. X The adsorption capacity of acidic gases is measured; then the mixed gas passes through activated carbon II impregnated with active components. The active components preferentially interact with polar molecules such as water vapor and SO2, reducing the competition between polar molecules and VOCs for adsorption on the microporous material, which helps the adsorption of VOCs on the microporous activated carbon, thereby achieving the effect of effectively removing VOCs.

Description

Technical Field

[0001] This invention relates to the field of air purification technology, specifically to a dual-effect carbon fiber reinforced cloth material and its preparation method. Background Technology

[0002] Activated carbon is a porous material with abundant microcrystalline, mesoporous, and microporous structures. It has a high specific surface area and excellent adsorption performance, overcoming many shortcomings of other adsorbents, and has become a widely used adsorbent for SO2 and NO2 removal. X Activated carbon is a commonly used adsorbent and catalytic redox carrier for acidic gases. It has a large adsorption capacity for various gases, mild operating conditions, low cost, strong regenerability, and is suitable for operation in various environments. It is currently the most commonly used adsorbent in air purification and is widely used in air purifiers.

[0003] Although activated carbon's unique microscopic and macroscopic physical structure gives it a strong adsorption capacity for gases, its limited variety and content of functional groups limit its effectiveness against SO2 and NO. X The adsorption capacity of activated carbon for acidic gases is limited, and it is easy to become saturated. This limits the adsorption and purification capacity of activated carbon for acidic gases in the air and for volatile organic compounds (VOCs) in high humidity and multi-component gas environments. Summary of the Invention

[0004] The purpose of this invention is to overcome at least one of the defects of the prior art and provide a dual-effect carbon-reinforced cloth material and its preparation method.

[0005] Water vapor is adsorbed by activated carbon under different conditions through different adsorption mechanisms. In high-humidity environments, water vapor mainly exists in the pore structure as capillary condensation, while in low-humidity environments, water vapor is mainly chemically adsorbed in the microporous structure. The hydrophilic groups carried on the surface of activated carbon play a crucial role in the adsorption process; most of them bind to water molecules through hydrogen bonds.

[0006] Inert gas heat treatment at higher temperatures can selectively remove oxygen-containing functional groups on the surface of activated carbon. The removal of oxygen-containing functional groups can increase the alkalinity of the activated carbon surface, which is beneficial for the adsorption of acidic gases. Furthermore, the acidic functional groups release CO2 during pyrolysis to form a porous structure. A small amount of CO remains on the material surface and forms pyridine with N2, which increases the alkalinity of the material surface and also increases the hydrophilicity of the material surface.

[0007] The adsorption performance of activated carbon is mainly related to its pore structure, specific surface area, and surface chemical properties. Surface chemical properties primarily depend on the type and number of surface functional groups. Generally, the more oxygen-containing functional groups, the greater the acidity, surface polarity, and hydrophilicity of the carbon-based material surface. The oxygen-containing functional groups in the material tend to form hydrogen bonds with water molecules, making it easy for water molecules to occupy VOCs adsorption sites, thus reducing the VOCs adsorption capacity of the carbon-based material. Adding alumina as an active component to microporous activated carbon, due to its polar adsorbent nature, allows it to preferentially interact with polar gas molecules such as water vapor and SO2 in the gas mixture during gas treatment. This reduces the competition between these polar molecules and VOCs for adsorption on the microporous material, thereby effectively removing VOCs. Impregnated active components can then remove VOCs through chemisorption.

[0008] The main mechanism of activated carbon adsorption of acidic gases is the chemical reaction between the basic oxygen-containing functional groups on its surface and the acidic gases. The adsorption capacity of activated carbon for SO2 depends on its pore size. Gases are transported through the pores of the activated carbon and ultimately adsorbed into the micropores. During the adsorption process, the oxidation of SO2 to SO3 is the controlling step of the entire reaction. The presence of oxygen-containing functional groups facilitates the oxidation of SO2, allowing SO2 to participate in the reaction quickly and completely, thus improving the removal efficiency of activated carbon for SO2. The hydrophilicity of the material allows SO3 to be further converted into H2SO4 droplets under the action of water molecules on the material surface. When the micropore filling of the activated carbon reaches a critical equilibrium, sulfuric acid automatically overflows from the micropores into larger channels. The sulfuric acid in the mesopores and macropores does not affect the effective diffusion coefficient of SO2. This ensures that some usable micropores remain in the activated carbon for a long time, extending the SO2 adsorption saturation time and thus achieving a higher SO2 adsorption capacity and a longer breakthrough time. Based on this, the present invention introduces abundant nitrogen- and oxygen-containing basic groups on the surface of activated carbon, which can achieve a high SO2 removal efficiency and a long breakthrough time under certain humidity conditions, further improving the adsorption performance of activated carbon for acidic gases in high humidity environments. Furthermore, the present invention sets coconut shell activated carbon dominated by micropores and activated carbon with both micropores and macropores and high iodine value upstream and downstream of the carbon-coated cloth, thereby simultaneously obtaining a high initial SO2 removal efficiency and full-cycle adsorption capacity.

[0009] The reaction mechanism of SO2 is as follows:

[0010] SO2 (gaseous state) → SO2 (adsorbed state) (1) O2 (gaseous state) → O2 (adsorbed state) (2) H2O (gas state) → H2O (adsorbed state) (3) SO2 (adsorbed state) + O2 (adsorbed state) → SO3 (adsorbed state) (4) SO3 (adsorbed state) + H2O (adsorbed state) → H2SO4 (adsorbed state) (5) H2SO4(adsorbed state) + nH2O(adsorbed state) → H2SO4·nH2O(adsorbed state) (6)

[0011] The objective of this invention can be achieved through the following technical solutions:

[0012] One objective of this invention is a method for preparing a dual-effect carbon-reinforced cloth material, comprising the following steps:

[0013] A layer of adhesive is laid flat on the non-wind-facing side of the skeleton support layer to form the first adhesive layer. Then, activated carbon I is evenly laid flat on the first adhesive layer, and then another layer of adhesive is laid flat to form the second adhesive layer. Next, activated carbon II is evenly laid flat on the second adhesive layer, and then a layer of adhesive and meltblown cloth are laid flat in sequence to obtain the dual-effect carbon-insulated cloth material.

[0014] Wherein, activated carbon I is alkali-modified hydrophilic activated carbon, and activated carbon II is activated carbon impregnated with and loaded with active components.

[0015] Furthermore, the skeleton support layer has a basis weight of 60-70 g / m³. 2 Polyester (PET) nonwoven fabric; the meltblown fabric has a basis weight of 25 g / m². 2 Polypropylene (PP) nonwoven fabric; the adhesive is a hot melt adhesive, which forms a hot melt adhesive web, i.e., an adhesive layer, with the first and third adhesive layers having a basis weight of 10-15 g / m². 2 Copolyester (PES) hot melt adhesive mesh, the second adhesive layer has a basis weight of 18-25 g / m². 2 The copolyester (PES) hot melt adhesive mesh has a melting temperature range of 80-120℃. The first and third layers of the hot melt adhesive mesh can also be composed of one or two of polyolefin (PO), copolyester (PES), and polyamide (PA), with a melting range of 80-120℃. In this invention, the second adhesive layer uses a hot melt adhesive mesh with a high basis weight that maintains stable mechanical properties after hot pressing, possessing excellent strength and rigidity. While ensuring the fixation of the two activated carbon layers, it also creates a certain gap between the two carbon layers. Gas passing through the interface layer will be diverted, reducing the resistance of the airflow through the carbon-reinforced cloth.

[0016] Furthermore, a desktop conveyor is installed below the skeleton support layer and a high-voltage electrostatic powder spreader is installed above it to ensure that the activated carbon can be evenly distributed in the skeleton layer. The powder amount of the high-voltage electrostatic powder spreader is adjustable within a range of 25%-35%, and the conveying frequency of the desktop conveyor is set to 15-20Hz. This ensures a uniform distribution of carbon particles in the carbon layer while preventing carbon particles from falling off the fabric surface due to excessive amplitude, frequency, or duration.

[0017] Furthermore, the materials stacked in sequence are pressed and molded using a hot pressing method to obtain a carbon-reinforced cloth material, wherein the hot pressing temperature range is 85-110℃.

[0018] Furthermore, the amount of activated carbon I and activated carbon II laid is 180-200 g / m², respectively. 2 80-100g / m 2 .

[0019] Further, the preparation method of activated carbon I is as follows: fully soak activated carbon I base carbon in nitric acid, take it out, wash it clean and dry it; mix the dried activated carbon I base carbon with potassium hydroxide evenly, calcine it in an inert gas, take it out, wash it until the filtrate is neutral, dry it to obtain activated carbon I.

[0020] Furthermore, the activated carbon I-based carbon is predominantly mesoporous with a specific surface area of ​​600-800 m². 2 / g, particle size is 0.25-0.60mm; the mass fraction of the nitric acid is 15-25%, and the soaking time is at least 12 hours; the first drying is vacuum drying, and the drying time is at least 12 hours.

[0021] Furthermore, the heating rate during calcination is 2-8℃ / min, preferably 4-6℃ / min, until the temperature reaches 400℃, and then held for 100-120min; the calcination atmosphere is a nitrogen environment, and the nitrogen flow rate is 1.0-2.0L / min.

[0022] Further, the preparation method of activated carbon II is as follows: the activated carbon II base carbon is uniformly dispersed in an active component solution, and then the active component is impregnated and loaded by an equal volume using an ultrasonic method to obtain activated carbon II. The activated carbon II base carbon can be uniformly dispersed in the active component solution by ultrasonic dispersion, with the ultrasonic dispersion temperature controlled at 30-50℃, preferably 40-45℃.

[0023] Furthermore, the activated carbon II-based carbon has a specific surface area of ​​1300-1600 m². 2 Microporous coconut shell activated carbon with a particle size of 0.18-0.25mm (60-80 mesh) and an iodine value of 1000-1500mg / g.

[0024] Further, the active component solution is one of KMnO4, Mn(NO3)2 or K2FeO4 solution, with a concentration of 0.8-2.0 mol / L, preferably 1.0-1.5 mol / L.

[0025] Furthermore, in the activated carbon II, the mass ratio of the active component to the activated carbon II base carbon is (12-18):100, and the particle size of the active component is 0.30-0.40 mm.

[0026] Furthermore, during the impregnation process, activated carbon II-based carbon is subjected to an ultrasonic water bath at 40-60 kHz for 80-120 min, followed by standing for 6-12 h, heating at 60-80 °C, and continuous stirring until the liquid is completely evaporated.

[0027] The second objective of this invention is to provide a dual-effect carbon fiber reinforced cloth material prepared by the method described above, which is suitable for air filtration and air purification and can be applied in air conditioners, air purifiers or fresh air systems.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] (1) In this invention, the skeleton support layer of the carbon-coated cloth material faces the gas to be purified, and the alkali-modified hydrophilic activated carbon I significantly increases the concentration of SO2 and NO in the gas to be purified. X The adsorption capacity of acidic gases is optimized to achieve high initial SO2 purification efficiency and water vapor removal. Then, the mixed gas passes through activated carbon II impregnated with active components. The active components preferentially interact with polar molecules such as water vapor and SO2, reducing the competition between water vapor, SO2, and VOCs for adsorption on the microporous material. This facilitates the adsorption of VOCs on the microporous activated carbon, thereby achieving effective VOCs removal. Through the combination of activated carbon I and activated carbon II layers, effective removal of acidic gases and VOCs can be achieved.

[0030] (2) The activated carbon I prepared in this invention, by introducing nitrogen- and oxygen-containing functional groups on the surface of the carbon material, can still achieve high SO2 removal efficiency in high humidity environments. The modified activated carbon I has a certain micropore ratio, which can achieve higher adsorption capacity and longer breakthrough time. Activated carbon I has a hierarchical pore structure, which is conducive to sufficient contact between SO2 and active sites, and thus helps to improve SO2 adsorption efficiency. Similarly, the nitrogen-containing functional groups on the surface of the treated material affect the adsorption of SO2 and NO in the pores. x The activity of the adsorption sites can effectively improve the adsorption of SO2 and NO. x The adsorption capacity is high. The hierarchical porous structure increases the number of oxygen-containing functional groups on the surface, effectively extending the SO2 adsorption saturation time. In summary, activated carbon I achieves both high SO2 removal efficiency and high adsorption capacity.

[0031] (3) The middle layer of the carbon-filled cloth material of the present invention is made of PES hot melt adhesive mesh with high rigidity and high toughness. The PES adhesive mesh can maintain stable mechanical properties while being hot-pressed and formed, and has excellent strength and rigidity. It enhances the stiffness of the carbon-filled cloth material and also allows the activated carbon layer to have certain gaps, which can increase the effective contact area between the gas and the activated carbon layer, and can also reduce the filtration resistance of the carbon-filled cloth material to a certain extent. Attached Figure Description

[0032] Figure 1 This is a comparison graph showing the change in toluene removal efficiency over time in Example 1 and Comparative Example 1;

[0033] Figure 2 This is a comparison graph showing the change of SO2 removal efficiency over time in Example 1 and Comparative Example 4. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0035] Example 1

[0036] I. A dual-effect carbon fiber reinforced cloth material, comprising the following steps:

[0037] Step 1: Preparation of Activated Carbon I

[0038] (1) The pore structure is selected with micropores as the main type and a specific surface area of ​​700 m². 2 / g of activated carbon I-based carbon with a particle size of 0.25-0.60mm was thoroughly soaked in 15% nitric acid for 12 hours and then dried in a vacuum oven for more than 12 hours.

[0039] (2) The dried activated carbon from step (1) is mixed with KOH solid at a ratio of 6:1 and placed in a crucible. Under a nitrogen atmosphere, the temperature is raised from room temperature to 400℃ at a rate of 5℃ / min in a tube furnace and held for 120min. The activated carbon is then cooled to room temperature at the same flow rate with N2. The carbon is then removed. The activated carbon is washed with deionized water until the filtrate is neutral. After drying, the alkali-modified hydrophilic activated carbon is obtained.

[0040] Step 2: Preparation of Activated Carbon II

[0041] Select a specific surface area of ​​1300 m² 2Microporous coconut shell activated carbon with a particle size of approximately 0.2 mm and an iodine value of 800 mg / g is designated as Activated Carbon II-based carbon. The mass ratio of the active component to the activated carbon II-based carbon is 15:100, and the particle size of the active component is approximately 0.35 mm. The activated carbon II-based carbon is immersed in the active component solution, and ultrasonic dispersion is performed at a controlled temperature of 40°C. During the impregnation process, the activated carbon II-based carbon is subjected to an ultrasonic water bath at 40 kHz for 80 min, followed by standing for 12 h, heating at 60°C, and continuous stirring until the liquid is completely eliminated. The active component is a 1.0 mol / L KMnO4 solution.

[0042] Step 3: Preparation of carbon fiber reinforced cloth

[0043] (1) After hot-pressing and fixing the first layer of hot melt adhesive mesh on the skeleton support layer, evenly spread activated carbon I on the surface, lay the first layer of hot melt adhesive mesh on the activated carbon I layer and hot-press and fix it, sprinkle activated carbon II on the second layer of hot melt adhesive mesh, then lay the third layer of hot melt adhesive mesh on the activated carbon II, and then stack meltblown cloth on the third layer of hot melt adhesive mesh.

[0044] (2) A desktop conveyor is set below the skeleton support layer and a high-voltage electrostatic powder sprinkler is set above it to ensure that the activated carbon can be evenly distributed in the skeleton layer;

[0045] (3) The above-mentioned materials are pressed and formed by hot pressing to obtain carbon cloth material;

[0046] The skeleton support layer uses 65g / m 2 Polyester (PET) nonwoven fabric; the meltblown fabric uses 25g / m 2 Polypropylene (PP) meltblown nonwoven fabric; the first and third layers of hot melt adhesive web are 10 g / m 2 The polyolefin (PO) has a melting temperature range of 95-105℃; the amount of activated carbon I and activated carbon II laid is 180g / m². 2 90g / m 2 In step (2), the speed frequency of the desktop conveyor is 15Hz; in step (3), the hot pressing temperature is controlled at 100℃.

[0047] II. Gas Filtration Treatment Test

[0048] The carbon-reinforced cloth material prepared above was cut into circular filter media with a diameter of 112.9 mm and applied to SO2 gas filtration tests. The SO2 concentration was 80 ppm (air as the base gas), the face velocity was 0.1 m / s (the frame support layer faced the wind), and the experimental environment was: temperature 25℃, relative humidity 50%. The SO2 removal efficiency and SO2 adsorption capacity (the SO2 concentration downstream of the filter media reached 95% of the upstream concentration) at 5 min and 10 min are listed in Table 1. The SO2 removal efficiency change curve over time is shown in Table 1. Figure 1 middle.

[0049] The carbon-reinforced cloth material prepared above was cut into circular filter media with a diameter of 112.9 mm. It was then used for toluene gas filtration tests. The toluene concentration was 80 ppm (air as the base gas), the face velocity was 0.1 m / s (the support layer of the filter media faced the wind), and the experimental environment was 25℃ and 50% relative humidity. The toluene removal efficiency and toluene adsorption capacity (the toluene concentration downstream of the filter media reached 95% of the upstream concentration) at 5 min and 10 min are listed in Table 1. The curve showing the change in toluene removal efficiency over time is presented in... Figure 2 middle.

[0050] like Figure 1 As shown, the carbon-coated cloth can completely remove SO2 within 15 minutes, after which the removal efficiency slowly decreases until it is completely deactivated after 80 minutes. Unmodified activated carbon, on the other hand, shows a rapid decrease in efficiency from the initial stage, reaching near zero after 25 minutes. Clearly, the modified activated carbon exhibits improved SO2 removal efficiency and adsorption capacity. This is because the presence of oxygen-containing functional groups facilitates SO2 oxidation, allowing SO2 to participate in the reaction quickly and completely, thus increasing the removal efficiency of activated carbon. The hydrophilicity of the material allows SO3 to be further converted into H2SO4 droplets under the action of water molecules on the material surface. When the micropore filling of the activated carbon reaches a critical equilibrium, sulfuric acid automatically overflows from the micropores into larger channels, increasing the breakthrough time for SO2 adsorption, prolonging the adsorption time, and achieving a higher adsorption capacity.

[0051] like Figure 2 As shown, the carbon-coated cloth can completely remove toluene within 10 minutes, and then the removal efficiency slowly decreases until it is completely deactivated after 90 minutes. As can be seen from Comparative Example 1, under a certain humidity environment, the modified dual-effect carbon-coated cloth obviously improves the removal efficiency and adsorption capacity of toluene. This is because water vapor condenses and gathers in the micropore adsorption center of the upper activated carbon through capillary action. While increasing the SO2 adsorption capacity, it also reduces the competitive adsorption of water vapor and toluene on activated carbon II for the adsorption sites, thereby prolonging the toluene adsorption time and obtaining a higher adsorption capacity.

[0052] Comparative Example 1

[0053] Compared with Example 1, the difference is that in step three, "only one layer of activated carbon II is laid flat", while the rest remains the same, and the gas filtration treatment test steps in Example 1 are followed. The results are shown in Table 1.

[0054] Depend on Figure 1 It can be seen that without the addition of activated carbon I, both the adsorption efficiency and adsorption capacity of toluene decrease. This is because water vapor in the gas condenses and accumulates in the micropore adsorption centers of the activated carbon via capillary action, causing partial occupation of the toluene adsorption sites, thus resulting in a decrease in both adsorption efficiency and adsorption capacity.

[0055] Comparative Example 2

[0056] Compared with Example 1, the difference is that in step three, "only one layer of activated carbon I is laid out", while the rest remains the same, and the gas filtration treatment test steps in Example 1 are followed. The results are shown in Table 1.

[0057] Comparative Example 3

[0058] Compared with Example 1, the difference is that in step three, "the two types of activated carbon are directly mixed, without laying a second adhesive mesh, and the rest remains unchanged, and the gas filtration treatment test steps in Example 1 are followed, and the results are shown in Table 1."

[0059] Compared with Example 1, Comparative Example 3 showed a slight decrease in both gas removal efficiency and adsorption capacity. This was due to the weakening of the gas flow diversion effect, the reduction of the effective contact area between the gas and the activated carbon layer, and the presence of water vapor in the gas in the activated carbon pore structure in the form of capillary condensation, which would block some of the adsorption channels and thus slightly reduce the removal efficiency.

[0060] Comparative Example 4

[0061] Compared with Example 1, the difference is that when the carbon cloth was used for SO2 gas filtration treatment test, the "experimental environment: temperature 25°C, dry gas" remained unchanged, and the gas filtration treatment test was carried out according to the gas filtration treatment test steps in Example 1. The results are shown in Table 1.

[0062] Depend on Figure 2It can be seen that, compared with Example 1, Comparative Example 4 shows a slight decrease in both SO2 removal efficiency and SO2 adsorption capacity. With the increase of humidity, the time for the modified carbon to completely remove SO2 also increases, while the time for complete deactivation decreases. Due to the hydrophilicity of the material, SO3 is further converted into H2SO4 droplets under the action of water molecules on the material surface. When the micropore filling of the activated carbon reaches a critical equilibrium, sulfuric acid will automatically overflow from the micropores into larger channels. As the reaction proceeds, more and more sulfuric acid droplets aggregate, occupying part of the volume of the activated carbon micropores and covering part of the active centers. This will also greatly reduce the effective diffusion coefficient of gas in the activated carbon particles, thus shortening the time for complete deactivation.

[0063] Comparative Example 5

[0064] Compared with Example 1, the difference is that in step two, "activated carbon II is not loaded with active components", while the rest remains the same. The gas filtration treatment test was conducted according to the gas filtration test steps in Example 1, and the results are shown in Table 1.

[0065] Example 2

[0066] I. A dual-effect carbon fiber reinforced cloth material, comprising the following steps:

[0067] Step 1: Preparation of Activated Carbon I

[0068] (1) The pore structure is selected with micropores as the main type and a specific surface area of ​​700 m². 2 / g of activated carbon-based carbon with a particle size of approximately 0.45mm was thoroughly soaked in 15% nitric acid for 12 hours and then dried in a vacuum oven for more than 12 hours.

[0069] (2) Dry activated carbon and KOH solid were mixed evenly in a 7:1 ratio and placed in a crucible. The mixture was heated from room temperature to 400℃ in a tube furnace at a nitrogen atmosphere at a rate of 10℃ / min and held for 120 min. The mixture was then cooled naturally to room temperature while maintaining the same flow rate of N2. The activated carbon was washed with deionized water until the filtrate was neutral. After drying, alkali-modified hydrophilic activated carbon I was obtained.

[0070] Step Two: Preparation of Activated Carbon II

[0071] Select a specific surface area of ​​1300 m² 2Microporous coconut shell activated carbon with a particle size of approximately 0.20 mm and an iodine value of 800 mg / g is designated as Activated Carbon II-based carbon. The mass ratio of the active component to the activated carbon II-based carbon is 15:100, and the particle size of the active component is approximately 0.35 mm. The activated carbon II-based carbon is immersed in the active component solution, and ultrasonic dispersion is performed at a controlled temperature of 45°C. During the impregnation process, the activated carbon II-based carbon is subjected to an ultrasonic water bath at 40 kHz for 80 min, followed by standing for 12 h, heating at 60°C, and continuous stirring until the liquid is completely eliminated. The active component is a 1.0 mol / L KMnO4 solution.

[0072] Step 3: Preparation of carbon fiber reinforced cloth

[0073] (1) After hot-pressing and fixing the first layer of hot melt adhesive mesh on the skeleton support layer, evenly spread activated carbon I on the surface, lay the second layer of hot melt adhesive mesh on the activated carbon I layer and hot-press and fix it, sprinkle activated carbon II on the second layer of hot melt adhesive mesh, then lay the third layer of hot melt adhesive mesh on the activated carbon II, and then stack meltblown cloth on the third layer of hot melt adhesive mesh.

[0074] (2) A desktop conveyor is set below the skeleton support layer and a high-voltage electrostatic powder sprinkler is set above it to ensure that the activated carbon can be evenly distributed in the skeleton layer;

[0075] (3) The materials stacked in sequence are pressed and formed by hot pressing to obtain carbon fiber reinforced cloth material. The skeleton support layer uses a 65g / m² material. 2 Polyester (PET) nonwoven fabric; the meltblown fabric layer uses 25g / m 2 Polypropylene (PP) meltblown nonwoven fabric; the first and third layers of hot melt adhesive web are 10 g / m 2 The polyolefin (PO) has a melting temperature range of 95-105℃; the amount of activated carbon I and activated carbon II laid is 180g / m². 2 90g / m 2 In step (2), the speed frequency of the desktop conveyor is 15Hz; in step (3), the hot pressing temperature is controlled at 100℃.

[0076] This embodiment was tested according to the gas filtration treatment test steps in Embodiment 1, and the results are shown in Table 1.

[0077] Example 3

[0078] I. A dual-effect carbon fiber reinforced cloth material, comprising the following steps:

[0079] Step 1: Preparation of Activated Carbon I

[0080] (1) The pore structure is selected with micropores as the main type and a specific surface area of ​​700 m². 2 / g of activated carbon I-based carbon with a particle size of approximately 0.45mm was thoroughly soaked in 25% nitric acid for 12 hours and then dried in a vacuum oven for more than 12 hours.

[0081] (2) The activated carbon I-based carbon obtained in step (1) is mixed with KOH solid at a mass ratio of 8:1. The mixture is then placed in a crucible and heated in a tube furnace at a rate of 5℃ / min under a nitrogen atmosphere from room temperature to 400℃ and held for 120min. The nitrogen is then allowed to cool naturally to room temperature at the same flow rate. The activated carbon is then washed with deionized water until the filtrate is neutral. After drying, the alkali-modified hydrophilic activated carbon is obtained.

[0082] Step Two: Preparation of Activated Carbon II

[0083] Select a specific surface area of ​​1300 m² 2 Microporous coconut shell activated carbon with a particle size of approximately 0.20 mm and an iodine value of 800 mg / g is used as the base carbon for activated carbon II. The active component accounts for 15% of the mass of coconut shell activated carbon II, and the particle size of the active component is approximately 0.35 mm. The activated carbon II base carbon is immersed in the active component solution, and ultrasonic dispersion is controlled at a temperature of 45°C. During the impregnation process, the activated carbon is ultrasonically bathed in a 40 kHz water bath for 80 min, then allowed to stand for 12 h, heated at 75°C, and stirred continuously until the liquid is completely eliminated. The active component is a 1.0 mol / L KMnO4 solution.

[0084] Step 3: Preparation of carbon fiber reinforced cloth

[0085] (1) After hot-pressing and fixing the first layer of hot melt adhesive mesh on the skeleton support layer, evenly spread activated carbon I on the surface, lay the second layer of hot melt adhesive mesh on the activated carbon I layer and hot-press and fix it, sprinkle activated carbon II on the second layer of hot melt adhesive mesh, then lay the third layer of hot melt adhesive mesh on the activated carbon II, and then stack meltblown cloth on the third layer of hot melt adhesive mesh.

[0086] (2) A desktop conveyor is set below the skeleton support layer and a high-voltage electrostatic powder sprinkler is set above it to ensure that the activated carbon can be evenly distributed in the skeleton layer;

[0087] (3) The above-mentioned materials are pressed and formed by hot pressing to obtain carbon cloth material.

[0088] The skeleton support layer uses 65g / m 2 Polyester (PET) nonwoven fabric; the meltblown fabric layer uses 25g / m 2 Polypropylene (PP) meltblown nonwoven fabric; the first and third layers of hot melt adhesive web are 10 g / m 2 The polyolefin (PO) has a melting temperature range of 95-105℃; the amount of activated carbon I and activated carbon II laid is 180g / m².2 90g / m 2 In step (2), the speed frequency of the desktop conveyor is 15Hz; in step (3), the hot pressing temperature is controlled at 100℃.

[0089] This embodiment was tested according to the gas filtration treatment test steps in Embodiment 1, and the results are shown in Table 1.

[0090] Table 1. SO2 and toluene removal efficiency and adsorption capacity in Examples 1-3 and Comparative Examples 1-6.

[0091]

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing a dual-effect carbon fiber reinforced cloth material, characterized in that, Includes the following steps: A layer of adhesive is laid flat on the skeleton support layer to form the first adhesive layer. Then, activated carbon I is evenly laid flat on the first adhesive layer, and then another layer of adhesive is laid flat to form the second adhesive layer. Next, activated carbon II is evenly laid flat on the second adhesive layer, and then another layer of adhesive and meltblown cloth are laid flat in sequence to obtain the dual-effect carbon-insulated cloth material. Wherein, activated carbon I is alkali-modified hydrophilic activated carbon, and activated carbon II is activated carbon impregnated and loaded with active components; The preparation method of the activated carbon I is as follows: Activated carbon I-based carbon is thoroughly soaked in nitric acid, removed, washed, and dried; the dried activated carbon I-based carbon is mixed evenly with potassium hydroxide, calcined in an inert gas atmosphere, removed, washed until the filtrate is neutral, and dried to obtain activated carbon I; The method for preparing the activated carbon II is as follows: Activated carbon II is obtained by uniformly dispersing the activated carbon II base carbon in an active component solution and then impregnating the loaded active component by an equal volume using an ultrasonic method. The active component solution is one of KMnO4, Mn(NO3)2 or K2FeO4 solution, with a concentration of 0.8-2.0 mol / L; in the activated carbon II, the mass ratio of the active component to the activated carbon II base carbon is (12-18):100, and the particle size of the active component is 0.30-0.40 mm.

2. The method for preparing a dual-effect carbon-reinforced cloth material according to claim 1, characterized in that, The amount of activated carbon I and activated carbon II laid is 180-200 g / m², respectively. 2 80-100g / m 2 .

3. The method for preparing a dual-effect carbon fiber reinforced cloth material according to claim 1, characterized in that, The specific surface area of ​​the activated carbon I-based carbon is 600-800 m². 2 / g, particle size of 0.25-0.60mm; the mass fraction of the nitric acid is 15-25%.

4. The method for preparing a dual-effect carbon fiber reinforced cloth material according to claim 1, characterized in that, The heating rate during the calcination process is 2-8℃ / min, and the calcination atmosphere is a nitrogen environment with a nitrogen flow rate of 1.0-2.0 L / min.

5. The method for preparing a dual-effect carbon fiber reinforced cloth material according to claim 1, characterized in that, The activated carbon II-based carbon has a specific surface area of ​​1300-1600 m². 2 Coconut shell activated carbon with a particle size of 0.18-0.25 mm and an iodine value of 1000-1500 mg / g.

6. The method for preparing a dual-effect carbon fiber reinforced cloth material according to claim 1, characterized in that, During the impregnation process, activated carbon II-based carbon is subjected to an ultrasonic water bath at 40-60 kHz for 80-120 minutes, followed by standing for 6-12 hours, heating at 60-80℃, and continuous stirring until the liquid is completely evaporated.

7. A dual-effect carbon fiber reinforced cloth material obtained by the preparation method according to any one of claims 1-6.

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