Plant polysaccharide foaming filter material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of foaming filter materials, and mainly relates to a plant polysaccharide foaming filter material as well as a preparation method and application thereof. The plant polysaccharide foaming filter material is prepared from the following raw materials in parts by mass: 20 to 30 parts of nano activated carbon, 95 to 105 parts of carboxymethyl cellulose, 1 to 5 parts of tea polyphenol microcapsules, 3 to 8 parts of a cross-linking agent, 1 to 5 parts of a foaming agent and 400 to 500 parts of water. The nano activated carbon is prepared from the following raw materials in parts by mass: 5 to 15 parts of sodium carboxymethyl cellulose, 0.5 to 1.5 parts of glucose, 100 to 120 parts of water and an activating agent; the tea polyphenol microcapsule is prepared from the following raw materials in parts by mass: 1 to 3 parts of sodium alginate and water, 0.1 to 0.5 part of tea polyphenol and 25 to 35 parts of calcium chloride solution. The plant polysaccharide foaming filtering material has a good filtering effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foamed filter materials, and particularly relates to a plant polysaccharide foamed filter material and a preparation method and application thereof. BACKGROUND

[0002] As a kind of bio-based filter medium taking natural polysaccharide as a core component, the plant polysaccharide foamed filter material has shown unique advantages in the fields of biological medicine, food processing and environmental governance in recent years. Its core feature lies in the synergistic effect of the molecular chain structure of plant polysaccharide and the foaming process, forming a filter layer with a three-dimensional porous network structure.

[0003] Although the existing plant polysaccharide foamed filter material has made progress in functionalization, its performance is still subject to some technical contradictions. For example, in the conventional foaming process, the uniformity of fiber dispersion directly affects the pore structure. For example, the bagasse fiber / polyvinyl alcohol composite foamed material needs to control the initial moisture content through a vacuum filtration device, but too high moisture content will cause water vapor boiling and cause the foaming hole to break, and too low moisture content will cause the fiber to entangle and form non-uniform pores. This structural defect causes local stress concentration in the material, which is prone to crack propagation in the compression test. For example, the antibacterial property of plant polysaccharide depends on the active groups such as hydroxyl and carboxyl on the molecular chain, but high-temperature foaming (>120℃) will cause the degradation of polysaccharide, so that the antibacterial rate is reduced from the initial 92% to below 65%. If a low-temperature foaming process is used, although the active ingredients can be preserved, the incomplete decomposition of the foaming agent will cause the pore connectivity to decrease, and the filtration flux to decrease by 40%-50%.

[0004] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a plant polysaccharide foamed filter material and a preparation method and application thereof, aiming to improve the filtering effect.

[0006] The technical scheme of the present application is as follows: A plant polysaccharide foamed filter material, comprising the following raw materials in parts by mass: 20-30 parts of nano-activated carbon, 95-105 parts of carboxymethyl cellulose, 1-5 parts of tea polyphenol microcapsules, 3-8 parts of a crosslinking agent, 1-5 parts of a foaming agent, and 400-500 parts of water; The nano-activated carbon comprises the following raw materials in parts by mass: 5-15 parts of sodium carboxymethyl cellulose, 0.5-1.5 parts of glucose, 100-120 parts of water, and an activating agent. The tea polyphenol microcapsules comprise the following raw materials in parts by mass: 1-3 parts of sodium alginate, water, 0.1-0.5 parts of tea polyphenol, and 25-35 parts of a calcium chloride solution.

[0007] When the tea polyphenol microcapsules gradually dissolve and release tea polyphenols during use, the hole space originally occupied by the tea polyphenol microcapsules is converted into a connected mesoporous network, and the original nanopores, micropores and macropores in the material together build a complete multi-level pore size distribution system, realizing multi-scale coverage. This dynamic pore structure change not only effectively increases the specific surface area, but also enriches the inner surface of the newly formed pores with active groups, providing an ideal place for the selective adsorption and hierarchical filtration of pollutants of different sizes and properties.

[0008] The entire release process presents a time-dependent filtration performance optimization feature: in the early stage, physical adsorption of the nano-activated carbon is mainly relied on, in the middle stage, the porosity continuously increases with the gradual release of the tea polyphenol microcapsules, and in the later stage, the optimal pore structure configuration is formed after complete release, and the released tea polyphenols form a "molecular imprinting" effect on the pore surface, showing special affinity for aromatic compounds, thereby realizing the transition from static filtration to dynamic adaptive filtration, continuously optimizing the filtration efficiency and selectivity during use.

[0009] Further, the preparation method of the nano-activated carbon comprises the following steps: The carboxymethyl cellulose sodium is mixed with water A to obtain a CMC-Na solution; the glucose is mixed with water B to obtain a glucose solution; The glucose solution and the CMC-Na solution are mixed to obtain a mixed solution A; The mixed solution A is reacted at 160-200℃ for 3-5h to form a preliminary carbon precursor; The preliminary carbon precursor is mixed with the activating agent, and activated at 750-850℃ for 1-2h to obtain a semi-finished product; The semi-finished product is washed to neutral, and freeze-dried to obtain the nano-activated carbon.

[0010] Further, the mass ratio of the preliminary carbon precursor to the activating agent is (3-5):1.

[0011] Further, after the preliminary carbon precursor and the activating agent are mixed, the temperature is raised to 750-850℃ at 3-6℃ / min under the protection of inert gas.

[0012] The present application forms a porous carbon precursor through hydrothermal reaction at 160-200℃, and then is activated at 750-850℃, effectively increasing the specific surface area. Its special structure makes it have extremely strong adsorption capacity for volatile organic compounds (such as aldehydes, benzene series) in cigarette smoke, semi-volatile substances (such as polycyclic aromatic hydrocarbons) and particulate matter.

[0013] The nanometer activated carbon preferentially adsorbs macromolecular particles to create a clean reaction environment for tea polyphenols. Tea polyphenols further purify small molecule harmful substances that are not completely adsorbed by activated carbon through chemical degradation. The natural aroma of tea polyphenols can neutralize the chemical odor that may remain after adsorption by activated carbon, improving the aftertaste of smoke. At the same time, the weak acidity of tea polyphenols and the adsorption of nanometer activated carbon form an acid-base buffer system, reducing the discomfort such as dry mouth and sore throat after smoking.

[0014] In addition, there is a complex and stable chemical bonding network between nanometer activated carbon and CMC matrix. This synergistic mechanism begins with the hydrothermal carbonization reaction of CMC-Na during the preparation of nanometer activated carbon. Under high temperature and pressure conditions of 180-220°C, the CMC-Na molecular chain undergoes dehydration, cyclization and aromatization reactions, forming nanoscale carbon skeletons with abundant surface functional groups. These carbon skeletons retain a large number of active groups such as carboxyl and hydroxyl groups, providing ideal reaction sites for subsequent chemical bonding with the CMC matrix.

[0015] When the pre-prepared nanometer activated carbon is mixed with the CMC matrix, the carboxyl groups on the surface of the activated carbon can form a hydrogen bond network with the hydroxyl groups on the CMC molecular chain. At the same time, under the catalysis of the crosslinking agent (citric acid), esterification reactions occur between the two, forming covalent bonds. This dual bonding mechanism makes the nanometer activated carbon no longer a simple physical filler, but a chemically bonded composite network structure with the CMC matrix. This chemical bonding significantly improves the mechanical strength of the material. Nanometer activated carbon, as a rigid reinforcing phase, is chemically bonded to the flexible CMC matrix, forming a rigid-flexible composite structure that effectively disperses and transmits stress, preventing interfacial debonding and crack propagation. At the same time, the high specific surface area and porous structure of nanometer activated carbon interpenetrate with the three-dimensional network of CMC, forming a composite pore structure with a multi-level pore size distribution. Not only does it maintain excellent filtration and adsorption performance, but it also ensures structural stability during long-term use through chemical bonding, avoiding the shedding of activated carbon particles and performance degradation, ultimately achieving a synergistic improvement in mechanical strength, structural stability and functional performance.

[0016] Further, the preparation method of the tea polyphenol microcapsule comprises the following steps: Mixing the sodium alginate with water to obtain a sodium alginate solution; Mixing the tea polyphenol, VC, and EDTA-2Na with water to obtain a tea polyphenol solution; Mixing the tea polyphenol solution with the sodium alginate solution to obtain a mixed solution B; Mixing the mixed solution B with the calcium chloride solution to form microcapsules, and continuously soaking for 1-3 hours; washing the microcapsules multiple times; Freeze-drying the microcapsules to obtain the tea polyphenol microcapsule.

[0017] Further, the mass ratio of sodium alginate to water is 1: (4-6) ; The mass ratio of tea polyphenol to water is 1: (2-4) ; the addition amount of VC is 0.05-0.15% of the total mass of tea polyphenol and water, and the addition amount of EDTA-2Na is 0.03-0.08% of the total mass of tea polyphenol and water.

[0018] Further, the mass concentration of the calcium chloride solution is 2%.

[0019] The tea polyphenol microcapsule plays a key synergistic role in the foaming process. The abundant carboxyl and hydroxyl groups on its surface provide ideal heterogeneous nucleation sites for the CO2 gas generated by the decomposition of the foaming agent sodium bicarbonate, significantly reducing the surface energy barrier of bubble formation, allowing bubbles to uniformly nucleate around the tea polyphenol microcapsule and exist stably. At the same time, the local cross-linking network formed by the bridging of calcium ions between tea polyphenol microcapsules and carboxymethyl cellulose matrix increases the viscosity of the system, effectively regulates the foaming kinetics process, delays the diffusion, coalescence and rupture of bubbles, and ensures the uniformity and stability of the bubble structure. This synergistic effect makes the final foaming material have higher bubble density, smaller and uniform pore size distribution, and higher closed pore rate, laying a good structural foundation for subsequent filtration and adsorption functions.

[0020] The dissolution and release mechanism of tea polyphenol microcapsules during the use of filter rods is a complex multi-factor synergistic process. When the high-temperature smoke generated by cigarette combustion passes through the filter, the significantly higher thermal environment than room temperature first triggers the intensification of the thermal motion of sodium alginate molecular chains, weakening the calcium ion cross-linking network that maintains the structural stability of tea polyphenol microcapsules. At the same time, the high humidity environment in the smoke promotes the penetration of water molecules into the tea polyphenol microcapsule, causing the hydration and swelling of sodium alginate molecules. At the same time, the weakly acidic environment of cigarette smoke further protonates the carboxyl groups on the sodium alginate molecular chain, destroying the original electrostatic interaction, while the abundant monovalent ions such as sodium ions and potassium ions in the smoke gradually replace the cross-linking sites of calcium ions through ion exchange mechanism, causing the gradual disintegration of the original stable structure.

[0021] Under the synergistic effect of multiple factors such as temperature, humidity, pH value and ionic strength, the porosity of the tea polyphenol microcapsule wall continuously increases. Tea polyphenol molecules first migrate from the inside of the capsule to the outside through a diffusion mechanism driven by concentration gradient. As the carrier structure further degrades, the release rate gradually accelerates. The whole process shows a time-dependent characteristic of diffusion release in the early stage of inhalation and carrier degradation release in the middle and late stages. At the same time, a temperature gradient distribution is formed along the length of the filter tip, which makes the microcapsules near the cigarette end release faster and the release at the far end relatively slower. Ultimately, multi-level slow-controlled release of tea polyphenols is achieved, which not only ensures the continuous performance of antioxidant effects, but also avoids the adverse effects of excessive release on the smoking taste.

[0022] This application also provides a method for preparing a plant polysaccharide foamed filter material, comprising the following steps: The nano-activated carbon, the tea polyphenol microcapsules, and the water are mixed to obtain a mixed solution C; The carboxymethyl cellulose was mixed with the mixed solution C at 200-400 rpm for 1.5-2.5 h to obtain the solution to be treated; The crosslinking agent and the solution to be treated are mixed at 300-500 rpm for 20-40 min to obtain a crosslinking mixture; The foaming agent is mixed with the crosslinking mixture to obtain a foaming mixture; The foaming mixture is foamed under ultrasonic conditions to obtain an assisted foaming mixture; The auxiliary foaming mixture is freeze-dried to obtain the plant polysaccharide foamed filter material.

[0023] Furthermore, the ultrasonic conditions are: a frequency of 25-35 kHz and a power density of 15-25 W / cm². 2 Time: 5-15 minutes.

[0024] Introducing ultrasonic assistance during the foaming process can reduce the surface tension of the polysaccharide solution, promoting bubble formation and uniform dispersion. Simultaneously, using freeze-drying technology instead of traditional drying methods can prevent cell collapse and maintain the material's pore structure.

[0025] This application also provides the application of a plant polysaccharide foamed filter material in a mouthpiece.

[0026] Compared with the prior art, this application has the following beneficial effects: 1. This application constructs a dynamic multi-level porous structure system through the dissolution and release mechanism of tea polyphenol microcapsules. Initially, it relies on the physical adsorption of nano-activated carbon; in the middle stage, as the microcapsules are released, a network of interconnected mesopores is formed; ultimately, it synergizes with the existing nanopores, micropores, and macropores to achieve multi-sized pore coverage. This structure effectively increases the specific surface area, and the inner surface of the newly formed pores is rich in active groups such as carboxyl and hydroxyl groups, forming hierarchical filtration channels. Furthermore, tea polyphenols selectively adsorb aromatic compounds, achieving a breakthrough transformation from static filtration to dynamic adaptive filtration.

[0027] 2. The nano-activated carbon prepared by this application through hydrothermal carbonization and high-temperature activation processes retains a large number of active groups such as carboxyl and hydroxyl groups on its surface. When mixed with the CMC matrix, it forms a dual bonding mechanism: on the one hand, physical anchoring is achieved through a hydrogen bond network; on the other hand, esterification reaction occurs under the action of a crosslinking agent to form covalent bonds, which significantly improves the tensile strength of the material. At the same time, the rigid nano-activated carbon and the flexible CMC matrix form a composite structure that combines rigidity and flexibility, effectively dispersing the load during stress transmission and improving the impact resistance of the material, which is significantly better than that of traditional physical mixed materials.

[0028] 3. Tea polyphenol microcapsules optimize the foaming process through multiple mechanisms: their surface carboxyl groups provide heterogeneous nucleation sites for CO2 bubbles in the foaming agent, lowering the nucleation energy barrier; the local cross-linked network formed by calcium ion bridging increases the system viscosity, effectively inhibiting bubble aggregation; and the compatibility of sodium alginate with CMC improves pore density. Through ultrasonic-assisted foaming and freeze-drying processes, a uniform pore structure with high closed-cell rate is finally obtained. This structure gives the material both high air permeability and high filtration performance. Detailed Implementation

[0029] To facilitate understanding of this application, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of this application.

[0030] This application provides a plant polysaccharide foamed filter material, comprising the following raw materials in parts by weight: 20-30 parts nano-activated carbon, 95-105 parts carboxymethyl cellulose, 1-5 parts tea polyphenol microcapsules, 3-8 parts crosslinking agent, 1-5 parts foaming agent, and 400-500 parts water.

[0031] The cross-linking agent is citric acid.

[0032] The foaming agent is sodium bicarbonate.

[0033] The particle size of nano-activated carbon is 40-50 nm.

[0034] Nano-activated carbon comprises the following raw materials in parts by weight: 5-15 parts sodium carboxymethyl cellulose, 0.5-1.5 parts glucose, 100-120 parts water, and activator.

[0035] The activator is KOH.

[0036] The preparation method of nano-activated carbon includes the following steps: Step A: Add sodium carboxymethyl cellulose to water A and stir at 200-400 rpm for 1-3 hours at 25°C to obtain a CMC-Na solution.

[0037] Step B: Dissolve glucose in water B and stir until completely dissolved to obtain a glucose solution.

[0038] Step C: Add the glucose solution to the CMC-Na solution and stir at 300-500 rpm for 20-40 minutes at 25°C to obtain mixed solution A.

[0039] Step D: Transfer the mixed solution A to a stainless steel high-pressure reactor lined with polytetrafluoroethylene, seal it, and place it in an oven. React at 160-200℃ for 3-5 hours to form a preliminary carbon precursor.

[0040] Step E: Mix the preliminary carbon precursor with KOH at a mass ratio of (3-5):1, transfer to a tube furnace, and heat to 750-850℃ at 3-6℃ / min under nitrogen protection for 1-2 hours to obtain a semi-finished product.

[0041] Step F: Wash the semi-finished product with 1 mol / L HCl until neutral, and then freeze-dry to obtain nano-activated carbon.

[0042] Regarding water A and water B, in step B, water B is reserved according to the ratio of glucose to water mass of 1:(5-10), and the remaining water is water A.

[0043] The tea polyphenol microcapsules contain the following raw materials in parts by weight: 1-3 parts sodium alginate, water, 0.1-0.5 parts tea polyphenols, and 25-35 parts calcium chloride solution.

[0044] The preparation method of tea polyphenol microcapsules includes the following steps: Step a: Dissolve sodium alginate in water and stir at 200-400 rpm for 1-3 hours at 25°C to obtain a sodium alginate solution. In this step, the mass ratio of sodium alginate to water is 1:(4-6).

[0045] Step b: Dissolve tea polyphenols in water, and add vitamin C and EDTA-2Na to mix, obtaining a tea polyphenol solution. In this step, the mass ratio of tea polyphenols to water is 1:(2-4); the amount of vitamin C added is 0.05-0.15% of the total mass of tea polyphenols and water, and the amount of EDTA-2Na added is 0.03-0.08% of the total mass of tea polyphenols and water.

[0046] Step c: Add the tea polyphenol solution to the sodium alginate solution and stir well to obtain mixed solution B.

[0047] Step d: Add mixed solution B dropwise to a 2% calcium chloride solution using a syringe, and stir continuously at 200-400 rpm to form microcapsules.

[0048] Step e: Soak the microcapsules in calcium chloride solution for 1-3 hours to solidify them.

[0049] Step f: Wash the microcapsules three times with deionized water to remove residual calcium chloride.

[0050] Step g: Freeze the microcapsules to -25~-15℃, and then freeze-dry them under vacuum to obtain tea polyphenol microcapsules.

[0051] This application also provides a method for preparing a plant polysaccharide foamed filter material, comprising the following steps: Step 1: Add nano-activated carbon and tea polyphenol microcapsules to water and stir at 300-500 rpm for 1-2 hours at 25-28℃ to obtain mixed solution C.

[0052] Step 2: Slowly add carboxymethyl cellulose to mixed solution C, and stir at 200-400 rpm for 1.5-2.5 hours at 25-28℃ to obtain the solution to be treated.

[0053] Step 3: Add the crosslinking agent to the solution to be treated, and stir at 300-500 rpm for 20-40 minutes at 25-28℃ to obtain the crosslinking mixture.

[0054] Step 4: Add the foaming agent to the crosslinking mixture and stir rapidly for 1-3 minutes to obtain the foamed mixture.

[0055] Step 5: Place the foaming mixture into an ultrasonic reactor, using a frequency of 25-35kHz and a power density of 15-25W / cm³. 2 The mixture is foamed with ultrasound for 5-15 minutes to obtain an auxiliary foaming mixture.

[0056] Step 6: Quickly pour the foaming agent mixture into the pre-prepared mold.

[0057] Step 7: Place the mold containing the mixture in a freezer at -20°C for 2 hours, then transfer it to a freeze dryer and vacuum dry it at -10°C for 24 hours to obtain the plant polysaccharide foamed filter material.

[0058] The present application of a plant polysaccharide foamed filter material in a mouthpiece.

[0059] The present application will be further described below through specific embodiments.

[0060] Example 1 A plant polysaccharide foamed filter material comprises the following raw materials in parts by weight: 25 kg nano-activated carbon, 100 kg carboxymethyl cellulose, 4 kg tea polyphenol microcapsules, 5 kg crosslinking agent, 2.5 kg foaming agent, and 450 kg water.

[0061] The cross-linking agent is citric acid.

[0062] The foaming agent is sodium bicarbonate.

[0063] The particle size of nano-activated carbon is 40-50 nm.

[0064] Nano-activated carbon comprises the following raw materials by weight: 10 kg sodium carboxymethyl cellulose, 1 kg glucose, 110 kg water, and activator.

[0065] The preparation method of nano-activated carbon includes the following steps: Step A: Add sodium carboxymethyl cellulose to water A and stir at 300 rpm for 2 hours at 25°C to obtain a CMC-Na solution.

[0066] Water A is 102 kg.

[0067] Step B: Dissolve glucose in water B and stir until completely dissolved to obtain a glucose solution.

[0068] The mass ratio of glucose to water B is 1:8, and the amount of water B is 8 kg.

[0069] Step C: Add glucose solution to CMC-Na solution and stir at 400 rpm for 30 minutes at 25°C to obtain mixed solution A.

[0070] Step D: Transfer the mixed solution A to a stainless steel high-pressure reactor lined with polytetrafluoroethylene, seal it, and place it in an oven to react at 180°C for 4 hours to form a preliminary carbon precursor.

[0071] Step E: Mix the preliminary carbon precursor with KOH (activator) at a mass ratio of 4:1, transfer to a tube furnace, and activate at 800℃ for 1.5h under nitrogen protection by heating at 5℃ / min to obtain a semi-finished product.

[0072] Step F: Wash the semi-finished product with 1 mol / L HCl until neutral, and then freeze-dry to obtain nano-activated carbon.

[0073] The tea polyphenol microcapsules contain the following raw materials in parts by weight: 2 kg sodium alginate, water, 0.4 kg tea polyphenols, and 30 kg calcium chloride solution.

[0074] The preparation method of tea polyphenol microcapsules includes the following steps: Step a: Dissolve sodium alginate in water and stir at 300 rpm for 2 hours at 25°C to obtain a sodium alginate solution. In this step, the mass ratio of sodium alginate to water is 1:5.

[0075] Step b: Dissolve tea polyphenols in water, and add vitamin C and EDTA-2Na to mix, obtaining a tea polyphenol solution. In this step, the mass ratio of tea polyphenols to water is 1:3; the amount of vitamin C added is 0.1% of the total mass of tea polyphenols and water, and the amount of EDTA-2Na added is 0.05% of the total mass of tea polyphenols and water.

[0076] Step c: Add the tea polyphenol solution to the sodium alginate solution and stir well to obtain mixed solution B.

[0077] Step d: Add mixed solution B dropwise to a 2% calcium chloride solution using a syringe, and stir continuously at 300 rpm to form microcapsules.

[0078] Step e: Soak the microcapsules in calcium chloride solution for 2 hours to solidify them.

[0079] Step f: Wash the microcapsules three times with deionized water to remove residual calcium chloride.

[0080] Step g: Freeze the microcapsules to -20°C and then freeze-dry them under vacuum to obtain tea polyphenol microcapsules.

[0081] This application also provides a method for preparing a plant polysaccharide foamed filter material, comprising the following steps: Step 1: Add nano-activated carbon and tea polyphenol microcapsules to water and stir at 400 rpm for 1.5 h at 25°C to obtain mixed solution C.

[0082] Step 2: Slowly add carboxymethyl cellulose to mixed solution C, and stir at 300 rpm for 2 hours at 25°C to obtain the solution to be treated.

[0083] Step 3: Add the crosslinking agent to the solution to be treated, and stir at 400 rpm for 30 minutes at 25°C to obtain the crosslinking mixture.

[0084] Step 4: Add the foaming agent to the crosslinking mixture and stir rapidly for 2 minutes to obtain the foamed mixture.

[0085] Step 5: Place the foaming mixture into an ultrasonic reactor, using a frequency of 30kHz and a power density of 20W / cm³. 2 The mixture was subjected to ultrasonic-assisted foaming for 10 minutes to obtain an assisted foaming mixture.

[0086] Step 6: Quickly pour the foaming agent mixture into the pre-prepared mold.

[0087] Step 7: Place the mold containing the mixture in a freezer at -20°C for 2 hours, then transfer it to a freeze dryer and vacuum dry it at -10°C for 24 hours to obtain the plant polysaccharide foamed filter material.

[0088] Performance testing: 1. The following performance tests were conducted on the plant polysaccharide foamed filter material: (1) Hardness was tested according to GB / T 5605-2011.

[0089] Test results: Hardness: 88%.

[0090] Compared with commercially available cellulose acetate filter rods, the hardness of commercially available cellulose acetate filter rods is 83%.

[0091] (2) Porosity: 82.4%.

[0092] (3) Activated carbon dispersibility test: The dispersion of nano-activated carbon in plant polysaccharide foamed filter material was observed using scanning electron microscopy (SEM).

[0093] Dispersion status: Well dispersed, with no obvious clustering.

[0094] 2. Plant polysaccharide foamed filter material was used to prepare the filter rod. The cigarette product was commercially available. The filter rod was 20mm long and 22-25mm in circumference. Cigarette samples were obtained and the following performance tests were conducted: (1) Filtration effect: Before the experiment, the cigarette samples were equilibrated for 48 hours under constant temperature (22±1)℃ and relative humidity (60±2)%. The cigarette samples were tested using a smoking machine. Each puff lasted 2 seconds, with a volume of 35 mL. The interval between puffs was 58 seconds. The temperature was 22±2℃ and the relative humidity was 60±5%. The smoke was collected, and the tar and carbon monoxide content in the smoke was measured.

[0095] Test results: Tar content: 6.2 mg / cig, Carbon monoxide content: 7.8 mg / cig.

[0096] (2) Sensory evaluation: 20 volunteers were selected for testing to evaluate whether the taste was good.

[0097] Test results: All volunteers reported that the taste was quite good.

[0098] Example 2 The difference from Example 1 is that the specific amount of raw materials used is different, but the rest is the same and will not be described in detail.

[0099] A plant polysaccharide foamed filter material comprises the following raw materials in parts by weight: 30 kg nano-activated carbon, 95 kg carboxymethyl cellulose, 1 kg tea polyphenol microcapsules, 3 kg crosslinking agent, 5 kg foaming agent, and 500 kg water.

[0100] Test results: (1) Filtration effect: Tar content: 7.0 mg / cig, carbon monoxide content: 8.6 mg / cig.

[0101] (2) Sensory evaluation: All volunteers indicated that the taste was good.

[0102] Example 3 The difference from Example 1 is that the specific amount of raw materials used is different, but the rest is the same and will not be described in detail.

[0103] A plant polysaccharide foamed filter material comprises the following raw materials in parts by weight: 20 kg nano-activated carbon, 105 kg carboxymethyl cellulose, 5 kg tea polyphenol microcapsules, 8 kg crosslinking agent, 1 kg foaming agent, and 400 kg water.

[0104] Test results: (1) Filtration effect: Tar content: 7.3 mg / cig, carbon monoxide content: 8.8 mg / cig.

[0105] (2) Sensory evaluation: All volunteers indicated that the taste was good.

[0106] Comparative Example 1 Using commercially available cigarette products as a comparison, the overall performance of cigarettes was tested.

[0107] Test results: (1) Filtration effect: Tar content: 10.2 mg / cig, carbon monoxide content: 12.7 mg / cig.

[0108] (2) Sensory evaluation: Some volunteers said that the taste was not good, while the rest of the volunteers said that the taste was good.

[0109] Comparative Example 2 The difference from Example 1 is that the nano-activated carbon is replaced with commercially available nano-activated carbon.

[0110] The activated carbon was purchased from Zhengzhou Yongkun Environmental Protection Technology Co., Ltd., and ground to 40-50nm.

[0111] Test results: 1. Hardness: 80%.

[0112] 2. Porosity: 78.4%.

[0113] 3. Dispersion: Generally well dispersed, with a small number of inconspicuous clusters.

[0114] 4. Filtration effect: Tar content: 9.0 mg / cig, carbon monoxide content: 10.6 mg / cig.

[0115] 5. Sensory evaluation: All volunteers indicated that the taste was quite good.

[0116] Comparative Example 3 The difference from Example 1 is that the tea polyphenol microcapsules are replaced with commercially available tea polyphenols.

[0117] Test results: 1. Hardness: 81%.

[0118] 2. Porosity: 81.1%.

[0119] 3. Dispersion status: Well dispersed, with no obvious clustering.

[0120] 4. Tar content: 8.5 mg / cig, carbon monoxide content: 10.2 mg / cig.

[0121] 5. Sensory evaluation: A few volunteers reported that the taste was not good, while the remaining volunteers reported that the taste was good.

[0122] Compared with commercially available cigarette products (Comparative Example 1), the plant polysaccharide foamed filter material of this application, when used in cigarettes, exhibits excellent filtration effects on tar, carbon monoxide, etc. Compared with commercially available cellulose acetate filter rods, the filter rod made from the plant polysaccharide foamed filter material of this application still exhibits higher mechanical properties. This demonstrates that the plant polysaccharide foamed filter material provided in this application possesses excellent mechanical properties and ideal filtration effects.

[0123] According to the comparison of the test data of Comparative Examples 2-3 and Example 1, it can be seen that the nano-activated carbon and tea polyphenol microcapsules specially prepared in this application have a special synergistic effect in the system. Randomly replacing or destroying their special combination will result in the plant polysaccharide foaming filter material that cannot show good results.

[0124] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of this application.

Claims

1. A plant polysaccharide foamed filter material, characterized in that, The raw materials include the following parts by weight: 20-30 parts nano-activated carbon, 95-105 parts carboxymethyl cellulose, 1-5 parts tea polyphenol microcapsules, 3-8 parts crosslinking agent, 1-5 parts foaming agent, and 400-500 parts water; The nano-activated carbon comprises the following raw materials in parts by weight: 5-15 parts sodium carboxymethyl cellulose, 0.5-1.5 parts glucose, 100-120 parts water, and activator; The tea polyphenol microcapsules comprise the following raw materials in parts by weight: 1-3 parts sodium alginate, water, 0.1-0.5 parts tea polyphenols, and 25-35 parts calcium chloride solution.

2. The plant polysaccharide foamed filter material according to claim 1, characterized in that, The preparation method of the nano-activated carbon includes the following steps: The sodium carboxymethyl cellulose was mixed with water A to obtain a CMC-Na solution; the glucose was mixed with water B to obtain a glucose solution. The glucose solution is mixed with the CMC-Na solution to obtain mixed solution A; The mixed solution A is reacted at 160-200℃ for 3-5 hours to form a preliminary carbon precursor; The preliminary carbon precursor is mixed with the activator and activated at 750-850℃ for 1-2 hours to obtain a semi-finished product. The semi-finished product was washed until neutral and then freeze-dried to obtain the nano-activated carbon.

3. The plant polysaccharide foamed filter material according to claim 2, characterized in that, The mass ratio of the preliminary carbon precursor to the activator is (3-5):

1.

4. The plant polysaccharide foamed filter material according to claim 2, characterized in that, After the preliminary carbon precursor is mixed with the activator, the temperature is increased to 750-850°C at 3-6°C / min under inert gas protection.

5. The plant polysaccharide foamed filter material according to claim 1, characterized in that, The preparation method of the tea polyphenol microcapsules includes the following steps: The sodium alginate was mixed with water to obtain a sodium alginate solution; The tea polyphenols, vitamin C, EDTA-2Na are mixed with water to obtain a tea polyphenol solution; The tea polyphenol solution and the sodium alginate solution are mixed to obtain mixed solution B; The mixed solution B is mixed with the calcium chloride solution to form microcapsules; and the microcapsules are continuously soaked for 1-3 hours; the microcapsules are then washed multiple times. The microcapsules were freeze-dried to obtain the tea polyphenol microcapsules.

6. The plant polysaccharide foamed filter material according to claim 5, characterized in that, The mass ratio of sodium alginate to water is 1:(4-6). The mass ratio of tea polyphenols to water is 1:(2-4); the amount of vitamin C added is 0.05-0.15% of the total mass of tea polyphenols and water, and the amount of EDTA-2Na added is 0.03-0.08% of the total mass of tea polyphenols and water.

7. The plant polysaccharide foamed filter material according to claim 5, characterized in that, The mass concentration of the calcium chloride solution is 2%.

8. A method for preparing a plant polysaccharide foamed filter material according to any one of claims 1-7, characterized in that, Includes the following steps: The nano-activated carbon, the tea polyphenol microcapsules, and the water are mixed to obtain a mixed solution C; The carboxymethyl cellulose was mixed with the mixed solution C at 200-400 rpm for 1.5-2.5 h to obtain the solution to be treated; The crosslinking agent and the solution to be treated are mixed at 300-500 rpm for 20-40 min to obtain a crosslinking mixture; The foaming agent is mixed with the crosslinking mixture to obtain a foaming mixture; The foaming mixture is foamed under ultrasonic conditions to obtain an assisted foaming mixture; The auxiliary foaming mixture is freeze-dried to obtain the plant polysaccharide foamed filter material.

9. The method for preparing the plant polysaccharide foamed filter material according to claim 8, characterized in that, The ultrasonic conditions are: operating frequency 25-35kHz, power density 15-25W / cm². 2 Time: 5-15 minutes.

10. The application of a plant polysaccharide foamed filter material according to any one of claims 1-7 in a mouthpiece.