Passive negative oxygen ion release type material loaded with nanometer pine needle extract and preparation method of passive negative oxygen ion release type material
By combining nano-pine needle extract with a porous carrier, a passive negative oxygen ion releasing material was prepared, which solved the problems of poor purification effect and easy volatilization of active ingredients in the existing negative oxygen ion materials in the absence of light. It achieved efficient and stable negative oxygen ion release and antibacterial effect.
Patent Information
- Application Number
- CN202511878424.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-02-27
AI Technical Summary
Existing negative ion materials have poor purification effects in environments with no light or low light. The active ingredients in liquid products are volatile, have a short service life, and pose safety risks and complex processing issues.
A passive negative oxygen ion releasing material was prepared by combining nano-pine needle extract with a porous carrier and through vacuum-ultrasonic alternating impregnation and chitosan coating. Terpenes, phenols, and organic acids in the nano-pine needle extract were used as reducing agents, and combined with the microelectrode structure of the porous carrier, a micro-galvanic cell was formed to achieve stable release of negative oxygen ions.
It achieves efficient and long-lasting release of negative oxygen ions that is all-natural and requires no external energy, and has multiple functions such as antibacterial and pollutant degradation, thereby improving the stability of the material and the concentration of negative oxygen ions released.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of negative oxygen ions, in particular to a passive negative oxygen ion releasing material loaded with nanometer pine needle extract and a preparation method thereof. BACKGROUND
[0002] With the acceleration of industrialization and urbanization, the problem of indoor and outdoor air pollution is becoming increasingly serious, which poses a significant threat to human health. Negative oxygen ions have certain potential in purifying air, inhibiting bacteria and disinfecting, and improving human physiological functions. Negative oxygen ions can combine with positively charged particles such as bacteria, viruses, and dust in the air, causing them to coagulate and settle, thereby effectively reducing the concentration of harmful substances in the air.
[0003] Currently, there are several methods for releasing negative oxygen ions: Photocatalytic materials, which usually use nanometer titanium dioxide as a photocatalyst, can generate electron-hole pairs under specific wavelength light, which in turn promotes the conversion of surrounding water and oxygen molecules into negative oxygen ions. However, this technology has inherent defects: first, its negative oxygen ion release efficiency is heavily dependent on ultraviolet or strong visible light irradiation, and in dark or weakly lit indoor closed spaces (such as closets, drawers, and rooms at night), its purification effect will be severely degraded or even completely ineffective, greatly limiting its application scenarios.
[0004] Another type of material is based on natural minerals such as tourmaline and rare earth composite minerals, combined with plant extracts, to prepare liquid ecological or bacteriostatic liquids. Although this type of product has the dual functions of releasing negative oxygen ions and inhibiting bacteria, the active ingredients in liquid products are prone to volatilization, oxidation, or chemical reactions, resulting in rapid decay of negative oxygen ion release performance over time, shortening the product's service life.
[0005] In summary, the current market's negative oxygen ion materials either have the shortcoming of environmental constraints on function, or face common technical problems such as safety risks, complex processes, and insufficient long-term stability. Therefore, there is an urgent need in the field to develop a new material that does not require external energy (such as light or electricity) to drive, is safe and non-toxic, and has the ability to efficiently and stably release negative oxygen ions, as well as other functions such as antibacterial and pollutant degradation. SUMMARY
[0006] The present application aims to provide a passive negative oxygen ion releasing material loaded with nanometer pine needle extract, which is rich in terpenes, phenols, and organic acids, serving as a natural reducing agent or electron donor. Without external energy (light or electricity), it can continuously and stably release high concentrations of negative oxygen ions, effectively purifying suspended particulate matter.
[0007] Another object of the present application is to provide a preparation method of passive negative oxygen ion releasing material loaded with nanometer pine needle extract, which realizes uniform loading of the extract in the pores of the porous carrier through vacuum-ultrasonic alternating immersion, strengthens the binding force between the extract and the carrier by combining chitosan coating and electrostatic field aging process, and improves the stability and long-acting property of the material in releasing negative oxygen ions, thereby solving the technical problems of easy attenuation of active ingredients in existing liquid products and uneven loading of solid materials.
[0008] The present application solves its technical problems by adopting the following technical solutions.
[0009] In one aspect, the present application provides a passive negative oxygen ion releasing material loaded with nanometer pine needle extract, comprising nanometer pine needle extract and a porous carrier, wherein the mass ratio of the nanometer pine needle extract to the porous carrier is 1:(1-1.2). The nanometer pine needle extract comprises, by weight fraction, the following raw materials: 80-90 parts of pine needle powder, 10-20 parts of cactus powder, 10-20 parts of rhodiola powder, 20-30 parts of cypress leaf powder, 5-10 parts of fishy grass, 5-10 parts of citrus peel, 1-5 parts of rosemary, and 1-5 parts of dry mugwort. The porous carrier comprises, by weight fraction, the following raw materials: 50-60 parts of coconut shell activated carbon, 20-30 parts of pumice, and 20-30 parts of wood ash.
[0010] In some embodiments of the present application, the nanometer pine needle extract is prepared by the following steps: Each raw material is mixed with water and then added to a disc mill for mechanical grinding to prepare a slurry. A composite enzyme is added to the slurry, which is treated by pulse ultrasonic at 40-50℃ for 1-2h. Filtration, concentration, and homogenization are performed to obtain the nanometer pine needle extract.
[0011] In some embodiments of the present application, the particle size of the nanometer pine needle extract is 50-200nm, preferably 100nm.
[0012] In some embodiments of the present application, the composite enzyme comprises, by weight fraction, 20-40 parts of cellulase, 30-50 parts of pectinase, 15-25 parts of hemicellulase, and 5-15 parts of beta-glucanase. In some embodiments of the present application, the porous carrier is prepared by the following steps: Coconut shell activated carbon is mixed with crushed pumice and placed in a microwave activation furnace for 15-30min. Plasma treatment is then performed for 2-5min in an air atmosphere. The mixture is then mixed with wood ash and water, stirred uniformly, granulated, and sintered to obtain the porous carrier.
[0013] In some embodiments of the present application, the sintering comprises: In a sintering furnace, the temperature is raised from room temperature to 300℃ at a rate of 3-5℃ / min, and kept for 1-1.5h, then raised to 500℃ at a rate of 3-5℃ / min, and kept for 1.5-2h; and the furnace is cooled to room temperature.
[0014] In another aspect, the embodiment of the present application provides a preparation method of passive negative oxygen ion releasing material loaded with nanometer pine needle extract, comprising the following steps: S1, the nanometer pine needle extract, porous carrier and ethanol are mixed and added to an impregnation kettle, ultrasonic treatment is first performed for 5-10min, then vacuum extraction is performed to 5-10KPa, and kept for 10-15min, after returning to normal pressure, ultrasonic treatment is performed again, and the alternating cycle treatment is performed for 3-5 times to obtain wet material; S2, the wet material is homogenized for 2-3 times under 60-80MPa; and then dried in a fluidized bed dryer while spraying chitosan acetic acid solution to obtain dry material; S3, the dry material is placed in an electrostatic field, and aged for 48-72h at 25-30℃ and relative humidity of 60-70% to obtain the negative oxygen ion releasing material.
[0015] In some embodiments of the present application, the mass fraction of the chitosan acetic acid solution is 1-2%, and the spraying amount of the chitosan acetic acid solution is 0.1-0.5% of the mass of the wet material.
[0016] In some embodiments of the present application, the chitosan acetic acid solution is sprayed into the fluidized drying bed in a bottom spraying or tangent spraying mode, the atomized particle size is 30-40um, and the atomization pressure is 0.2-0.4MPa.
[0017] In some embodiments of the present application, the field strength of the electrostatic field is 1-5 kV / cm.
[0018] In some embodiments of the present application, the field strength of the electrostatic field is 2-3 kV / cm.
[0019] Compared with the prior art, the embodiments of the present application have at least the following advantages or beneficial effects: The present application provides a novel material which is all-natural, passive, long-acting and has multiple environmental purification functions. The nanometer pine needle extract is rich in terpenes, phenols and organic acids, which are natural reducing agents or electron donors. The activated carbon in the porous carrier is a conductive microelectrode, and the wood ash provides a natural electrolyte. Water molecules in the environment provide a medium for ion migration, and numerous micro primary cells are formed in the pores of the carrier. At the anode, the reducing components such as terpenes and phenols in the nanometer pine needle extract lose electrons and are oxidized. At the cathode, oxygen in the air obtains electrons and combines with water to generate negative oxygen ions (O2 - H2O), without the need for external energy such as light, electricity, etc. to achieve sustained and stable release of negative oxygen ions, thereby purifying suspended particulate matter.
[0020] The compounding formula of the nano pine needle extract (pine needles as the main component, supplemented by cacti, rhodiola, etc.) provides a rich supply of reducing electron donors; the porous carrier activated by microwaves and plasma has a high specific surface area and active functional groups, and can efficiently load the extract; vacuum-ultrasonic alternating immersion ensures that the extract enters the micropores / mesopores of the carrier, and chitosan coating prevents the extract from being oxidized by volatilization, and electrostatic field aging strengthens the stability of the micro-battery structure. The synergistic effect of the above-mentioned characteristics makes the concentration and stability of the negative oxygen ion release of the material far exceed those of the prior art, and this synergistic effect cannot be achieved by a single technical feature. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below. If specific conditions are not specified in the embodiments, conventional conditions or manufacturer recommended conditions are used. If the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased on the market.
[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to specific embodiments.
[0023] Embodiment 1 1. The nano pine needle extract is prepared according to the following formula and steps: 85 parts of pine needle powder, 15 parts of cactus powder, 15 parts of rhodiola powder, 25 parts of thuja sibirica leaf powder, 8 parts of fishy grass, 8 parts of citrus peel, 3 parts of rosemary, and 3 parts of dry mugwort leaves. The raw materials are mixed with water, then added to a disc mill for mechanical grinding to obtain a slurry; composite enzymes are added to the slurry, and pulse ultrasonic treatment is performed at 45°C for 2h; filtration, concentration and homogenization are performed to obtain the nano pine needle extract.
[0024] The composite enzymes include cellulase 20 parts, pectinase 30 parts, hemicellulase 15 parts, and β-glucanase 5 parts by weight. The amount of composite enzymes added is 1% of the dry matter mass of the raw materials. Cellulase: enzyme activity ≥ 10,000 U / g; pectinase: enzyme activity ≥ 3,000 U / g; hemicellulase: enzyme activity ≥ 5,000 U / g; β-glucanase: enzyme activity ≥ 20,000 U / g.
[0025] The parameters of the pulse ultrasonic treatment are as follows: the slurry is configured according to the mass ratio of dry matter of raw materials to water = 1:5, the volume is about 750 mL, the ultrasonic power is 300 W (the power density is about 0.4 W / mL), the pulse mode is working for 3 seconds and intermittent for 7 seconds, and the total treatment time is 2 hours.
[0026] 2. The porous carrier is prepared according to the following formula and steps: 55 parts of coconut shell activated carbon, 25 parts of pumice, and 25 parts of wood ash; The coconut shell activated carbon is mixed with the crushed pumice, and is placed in a microwave activation furnace (power 5 kW) for treatment under an inert atmosphere (nitrogen) for 20 min; then it is treated by plasma under an air atmosphere for 3 min; then it is mixed with water and wood ash, stirred uniformly, granulated, and sintered to obtain the porous carrier.
[0027] In the sintering furnace, the temperature is raised from room temperature to 300℃ at a rate of 5℃ / min, and then the temperature is raised to 500℃ at a rate of 5℃ / min, and the temperature is kept for 2h; and the furnace is cooled to room temperature. The parameters of the plasma treatment are as follows: treatment power: 200 W, gas flow: 80 sccm; system pressure: 100 Pa.
[0028] 3. The negative oxygen ion releasing material is prepared according to the following steps: S1, the nano-pine needle extract, the porous carrier, and ethanol are mixed according to a mass ratio of 1:1, and are added to an impregnation kettle, and are treated by ultrasonic for 10 min, and then are vacuumed to 10 KPa and kept for 15 min, and then are treated by ultrasonic after being restored to normal pressure, and the above-mentioned treatment is alternately cycled for 5 times to obtain a wet material; S2, the wet material is treated by homogenization under 80 MPa for 3 times; and then is dried in a fluidized bed dryer while spraying a chitosan acetic acid solution to obtain a dry material; wherein the mass fraction of the chitosan acetic acid solution is 1.2%, and the spraying amount of the chitosan acetic acid solution is 0.25% of the mass of the wet material. The chitosan acetic acid solution is sprayed into the fluidized drying bed in a bottom spraying mode, the atomized particle size is 40 um, and the atomization pressure is 0.4 MPa.
[0029] S3, the dry material is placed in an electrostatic field (field strength 2 kV / cm) and is aged for 48 h at 30℃ and a relative humidity of 60% to obtain the negative oxygen ion releasing material.
[0030] Example 2 The difference between example 1 and example 2 is that the formula of the nano-pine needle extract is as follows: 80 parts of pine needle powder, 10 parts of cactus powder, 10 parts of rhodiola powder, 20 parts of thujoid leaf powder, 5 parts of fishy grass, 5 parts of citrus peel, 1 part of rosemary, and 1 part of dry eucalyptus leaf. The mass ratio of the nano-pine needle extract to the porous carrier is 1:1.1.
[0031] The preparation method is the same as that of Example 1, the formula and preparation method of the porous carrier, and the formula and preparation method of the negative oxygen ion releasing material are the same as those of Example 1.
[0032] Example 3 The difference from Example 1 is that the formula of the nanometer pine needle extract is: 90 parts of pine needle powder, 20 parts of cactus powder, 20 parts of rhodiola powder, 30 parts of thuja powder, 10 parts of fishy grass, 10 parts of citrus peel, 5 parts of rosemary, and 5 parts of dry mugwort. The mass ratio of the nanometer pine needle extract to the porous carrier is 1:1.2.
[0033] The preparation method is the same as that of Example 1, the formula and preparation method of the porous carrier, and the formula and preparation method of the negative oxygen ion releasing material are the same as those of Example 1.
[0034] Example 4 The difference from Example 1 is that the formula of the porous carrier is: 50 parts of coconut shell activated carbon, 20 parts of pumice, and 20 parts of wood ash; The preparation method is the same as that of Example 1, the formula and preparation method of the nanometer pine needle extract, and the formula and preparation method of the negative oxygen ion releasing material are the same as those of Example 1.
[0035] Example 5 The difference from Example 1 is that the formula of the porous carrier is: 60 parts of coconut shell activated carbon, 30 parts of pumice, and 30 parts of wood ash; The preparation method is the same as that of Example 1, the formula and preparation method of the nanometer pine needle extract, and the formula and preparation method of the negative oxygen ion releasing material are the same as those of Example 1.
[0036] Example 6 The difference from Example 1 is that in the step S2 of preparing the negative oxygen ion releasing material, the mass fraction of the chitosan acetic acid solution is 1%, the spraying amount of the chitosan acetic acid solution is 0.5% of the wet material mass, the atomized particle size of the spraying is 30um, and the atomization pressure is 0.2MPa. The remaining raw materials and the preparation method are the same as those of Example 1.
[0037] Example 7 The difference from Example 1 is that in the step S2 of preparing the negative oxygen ion releasing material, the mass fraction of the chitosan acetic acid solution is 2%, the spraying amount of the chitosan acetic acid solution is 0.1% of the wet material mass, the atomized particle size of the spraying is 30um, and the atomization pressure is 0.4MPa. The remaining raw materials and the preparation method are the same as those of Example 1.
[0038] Example 8 The difference from Example 1 is that in the step S3 of preparing the negative oxygen ion releasing material, the field strength of the electrostatic field is 5 kV / cm, and the rest of the raw materials and the preparation method are the same as those of Example 1.
[0039] Example 9 The difference from Example 1 is that in the step S3 of preparing the negative oxygen ion releasing material, the field strength of the electrostatic field is 1 kV / cm, and the rest of the raw materials and the preparation method are the same as those of Example 1.
[0040] Comparative Example 1 The difference from Example 1 is that the preparation method of the porous carrier is: The coconut shell activated carbon, pumice, wood ash, and water are directly mixed, granulated, sintered to obtain a porous carrier, and the rest of the raw material ratio and the preparation method are the same as those of Example 1.
[0041] Comparative Example 2 The difference from Example 1 is that in the step S1 of preparing the negative oxygen ion releasing material, no vacuum treatment is performed, and the rest of the steps and the formula are the same as those of Example 1.
[0042] Comparative Example 3 The difference from Example 1 is that in the step S2 of preparing the negative oxygen ion releasing material, no chitosan acetic acid solution is sprayed, and the rest of the steps and the formula are the same as those of Example 1.
[0043] Comparative Example 4 The difference from Example 1 is that in the step S1 of preparing the negative oxygen ion releasing material, no vacuum treatment is performed, and in the step S3, no electrostatic field is applied, and the rest of the raw materials and the steps are the same as those of Example 1.
[0044] Comparative Example 5 The difference from Example 1 is that in the step S1 of preparing the negative oxygen ion releasing material, no vacuum treatment is performed; in the step S3, no electrostatic field is applied, and the rest of the raw materials and the steps are the same as those of Example 1.
[0045] Experimental Example The performance of each negative oxygen ion releasing material is tested as follows.
[0046] 1. Negative oxygen ion release concentration test Test standard: Refer to GB / T 18809-2019 "General Specification for Air Ion Measuring Instrument" for testing.
[0047] Test environment: In a 1m³ stainless steel or glass sealed test chamber. The chamber is controlled at temperature 25±2℃, relative humidity 50±5%, background negative oxygen ion concentration <100 ions / cm³.
[0048] Test procedure: 10g of the sample to be tested is evenly spread on a petri dish and placed in the center of the test chamber. The test chamber is sealed and left for 2 hours to allow the concentration in the chamber to reach dynamic equilibrium. A calibrated air ion measuring instrument (Japan COM-3600PRO) is used, with the air inlet of the instrument connected to the test chamber through a pipe. The data is recorded every 5 minutes for 30 minutes, with the average value taken as the negative oxygen ion release concentration of the sample, at a height of 20 cm above the sample surface.
[0049] Stability test: After the sample is placed in a simulated indoor environment for 90 days, the above test procedure is repeated to calculate the retention rate of negative oxygen ion concentration (concentration after 90 days / initial concentration x 100%).
[0050] 2. Antibacterial performance test Test standard: Refer to GB / T 21551.2-2010 "Special requirements for antibacterial materials for household and similar appliances" for antibacterial, sterilization and purification functions.
[0051] Test bacteria: Staphylococcus aureus, strain number: ATCC 6538; Escherichia coli, strain number: ATCC25922; Test procedure: 0.2 mL of bacterial suspension (concentration 1.0x10 6 CFU / mL) is evenly added to the surface of 10g of sample, covered with sterile polyethylene film to ensure that the bacterial solution is in full contact with the surface of the sample.
[0052] The sample is placed in an incubator at 35±1℃ and relative humidity >90% for 24 hours. After incubation, the sample is placed in a quantitative saline solution and shaken thoroughly to elute the bacteria. Plate counting method is used to calculate the number of viable bacteria in the eluate.
[0053] Result calculation: Antibacterial rate (%) = (A - B) / A x 100%; Where: A is the average number of recovered bacteria of the blank control (sterile polyethylene film); B is the average number of recovered bacteria of the sample.
[0054] 3. Formaldehyde removal rate test Test standard: Refer to the test method for gaseous pollutant purification performance in Appendix of GB / T 18801-2015 "Air purifier".
[0055] Test environment: In a 1m³ sealed test chamber. Environmental conditions are the same as above.
[0056] Test procedure: 10g sample was placed in the test chamber. A certain amount of formaldehyde solution (analytical pure) was injected into the chamber with a microsyringe, and the fan in the chamber was started to mix for 10 minutes. The initial concentration of formaldehyde in the chamber was stabilized at 1.0 ± 0.1mg / m³. The test chamber was sealed, the fan was turned off, and the sample was allowed to naturally stand for 24 hours. At 0 hours and 24 hours, the formaldehyde concentration in the chamber was collected and detected using a formaldehyde analyzer (phenol reagent spectrophotometry).
[0057] Result calculation: Formaldehyde removal rate (%) = (C0- C 24 ) / C0× 100%; where: C0is the initial concentration at 0 hours; C 24 is the concentration at 24 hours.
[0058] The results are shown in Table 1.
[0059] Table 1
[0060] From Table 1, it can be seen that the negative oxygen ion concentration of Example 2 (2350 ions / cm³) is about 17.5% lower than that of Example 1 (2850 ions / cm³). This shows that the plant active ingredient as an electron donor plays a basic role in the “micro-battery” reaction. When the reactant is insufficient, the release concentration of negative oxygen ions decreases accordingly. The concentration of Example 3 (3050 ions / cm³) is only about 7.0% higher than that of Example 1, and the excess active ingredient cannot be effectively loaded and utilized.
[0061] From Examples 1, 4-5, it can be seen that the coconut shell activated carbon provides a dominant electrical skeleton and specific surface area; the mineral composition of the pumice stone may optimize the microenvironment of the interfacial reaction; and the wood ash as a natural electrolyte improves the ionic conductivity of the system. The three work together to build an efficient “micro-battery” network. Example 8 has the highest release concentration (3350 ions / cm³) and stability (86% retention rate). The strong static electric field (5 kV / cm) promotes the highly directional arrangement of dipole molecules (such as terpenes, flavonoids) in the plant extract in the carrier pores, forming a more stable and denser electric dipole matrix. This is equivalent to pre-polarizing and structurally strengthening the micro-battery at the micro level, not only improving the initial efficiency, but also enhancing the anti-fading ability.
[0062] Comparative Example 1 decreased by 56.1%, and the unactivated carrier resulted in underdeveloped pore structure and small specific surface area; and the lack of plasma treatment made the carrier surface lack the necessary oxygen-containing functional groups, poor hydrophilicity and chemical activity, resulting in poor loading capacity and reaction efficiency.
[0063] Comparative Example 2 has a performance reduction of 35.1%. No vacuum impregnation is performed, and the active ingredient cannot enter the mesopores and micropores of the carrier, but only stays on the surface, and the effective reaction area is sharply reduced.
[0064] Comparative Example 3 has a stability retention rate (65%) much lower than that of Comparative Example 2 (69%), indicating that chitosan coating plays a decisive role in fixing the active ingredient and preventing its volatilization and oxidation loss, and the chitosan coating can improve the service life of the material.
[0065] The antibacterial and formaldehyde purification functions of the negative oxygen ion release material provided by the embodiments of the present application do not exist independently, but are tightly coupled with the negative oxygen ion release system to form a synergistic network.
[0066] After the negative oxygen ions contact with bacteria, they can destroy the charge balance of the cell membrane and be converted into reactive oxygen species (ROS) to oxidatively damage the proteins and DNA of the bacteria. The components such as Houttuynia cordata extract and thujaplicin can directly act on the bacterial cell membrane and enzyme system. The positive charges on the chitosan membrane combine with the negative charges on the bacterial cell membrane to disturb its metabolism.
[0067] The formaldehyde removal rate is positively correlated with the concentration of negative oxygen ions. The removal of formaldehyde not only depends on the physical adsorption of the carrier, but also can be oxidatively degraded by the negative oxygen ions and the active substances derived therefrom. The carrier adsorbs and enriches formaldehyde, creating necessary conditions for subsequent catalytic degradation.
[0068] The above-described embodiments are part of the embodiments of the present application, but not all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
Claims
1. A passive negative oxygen ion releasing material loaded with nano-pine needle extract, characterized in that, It includes nano-pine needle extract and a porous carrier, wherein the mass ratio of the nano-pine needle extract to the porous carrier is 1:(1-1.2). The nano-pine needle extract comprises the following raw materials by weight: Pine needle powder 80-90 parts, cactus powder 10-20 parts, Rhodiola rosea powder 10-20 parts, arborvitae leaf powder 20-30 parts, houttuynia cordata 5-10 parts, citrus peel 5-10 parts, rosemary 1-5 parts, dried mugwort 1-5 parts. The porous carrier comprises the following raw materials by weight: 50-60 parts coconut shell activated carbon, 20-30 parts pumice, and 20-30 parts wood ash.
2. The passive negative oxygen ion releasing material loaded with nano-pine needle extract according to claim 1, characterized in that, The nano-pine needle extract was prepared by the following steps: Mix the raw materials with water, then add them to a disc mill for mechanical grinding and pulping to obtain a slurry; add a compound enzyme to the slurry and treat it with pulsed ultrasound at 40-50℃ for 1-2 hours; filter, concentrate, and homogenize to obtain the nano pine needle extract.
3. The passive negative oxygen ion releasing material loaded with nano-pine needle extract according to claim 2, characterized in that, The compound enzyme, by weight, comprises 20-40 parts cellulase, 30-50 parts pectinase, 15-25 parts hemicellulase, and 5-15 parts β-glucanase.
4. The passive negative oxygen ion releasing material loaded with nano-pine needle extract according to claim 1, characterized in that, The porous carrier is prepared by the following steps: Mix coconut shell activated carbon with crushed pumice, place in a microwave activation furnace and treat for 15-30 minutes; then treat with plasma in an air atmosphere for 2-5 minutes; then mix with wood ash and water, stir evenly, granulate, and sinter to obtain the porous carrier.
5. The passive negative oxygen ion releasing material loaded with nano-pine needle extract according to claim 4, characterized in that, The sintering includes: In the sintering furnace, the temperature is increased from room temperature to 300℃ at a rate of 3-5℃ / min, held for 1-1.5 hours, then increased to 500℃ at a rate of 3-5℃ / min, held for 1.5-2 hours, and then cooled to room temperature with the furnace.
6. A method for preparing a passive negative oxygen ion releasing material loaded with nano-pine needle extract as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Mix nano-pine needle extract, porous carrier and ethanol, add to impregnation vessel, first sonicate for 5-10 min, then vacuum to 5-10 kPa, maintain for 10-15 min, restore to normal pressure, and sonicate again. Repeat the alternating cycle 3-5 times to obtain wet material. S2, the wet material is homogenized 2-3 times at 60-80MPa; then dried in a fluidized bed dryer while simultaneously spraying in a chitosan acetic acid solution to obtain the dry material; S3. Place the dry material in an electrostatic field and age it for 48-72 hours at 25-30℃ and 60-70% relative humidity to obtain the negative oxygen ion releasing material.
7. The method for preparing a passive negative oxygen ion releasing material loaded with nano-pine needle extract according to claim 6, characterized in that, The chitosan acetic acid solution has a mass fraction of 1-2%, and the amount of chitosan acetic acid solution injected is 0.1-0.5% of the mass of the wet material.
8. The method for preparing a passive negative oxygen ion releasing material loaded with nano-pine needle extract according to claim 6, characterized in that, The chitosan acetic acid solution is sprayed into the fluidized drying bed by bottom spraying or tangential spraying, with an atomized particle size of 30-40 μm and an atomization pressure of 0.2-0.4 MPa.
9. The method for preparing a passive negative oxygen ion releasing material loaded with nano-pine needle extract according to claim 6, characterized in that, The field strength of the electrostatic field is 1-5 kV / cm.
10. The method for preparing a passive negative oxygen ion releasing material loaded with nano-pine needle extract according to claim 9, characterized in that, The field strength of the electrostatic field is 2-3 kV / cm.