Porous carrier-loaded phytoncide negative oxygen ion releasing agent and preparation process thereof

Abstract

The invention relates to the field of negative oxygen ions, in particular to a preparation process of a negative oxygen ion releasing agent with phytoncide loaded on a porous carrier. Comprising the following steps: preparing mesoporous silica core material powder loaded with phytoncide; adding the calcium alginate gel microspheres into a chitosan acetic acid solution, centrifugally collecting microcapsules, washing, and freeze-drying to obtain microcapsule powder; the preparation method comprises the following steps: adding glycerol and tween-80 into water, carrying out uniform ultrasonic dispersion, adding the microcapsule powder, carrying out magnetic stirring until the microcapsule powder is uniformly dispersed, adjusting the pH value of the system to 6.0, and filtering with a microporous filter membrane to obtain the negative oxygen ion releasing agent. The plant extract is wrapped by a microcapsule technology, so that the defects that plant phytoncide is easy to volatilize and unstable are overcome, and long-acting release of the negative oxygen ion releasing agent is realized.

Description

Technical Field

[0001] This invention relates to the field of negative oxygen ions, and more specifically, to a preparation process of a negative oxygen ion releasing agent loaded with phytoncides on a porous carrier. Background Technology

[0002] Negative oxygen ions are essentially negatively charged gaseous oxygen molecules (O2). - ) or hydroxyl ion (OH) - Negative oxygen ions have multiple positive effects on the environment and health, such as air purification: they can combine with positively charged suspended particulate matter in the air (such as PM2.5, dust, bacteria, and viral aerosols) through electrostatic interactions, causing them to agglomerate and settle, thereby effectively reducing pollutant concentrations and purifying the air. Sterilization and disinfection: Negative oxygen ions can penetrate the cell membranes of microorganisms, disrupting their protein structure and energy metabolism (such as affecting cell membrane potential), and have inhibitory or inactivating effects on various bacteria, molds, and some viruses. Health benefits: Medical research shows that a high concentration of negative oxygen ions can promote the oxidative deamination of monoamine oxidase (MAO) in the human body, reducing the concentration of serotonin in the blood, thus having the effects of regulating the central nervous system, relieving fatigue, improving sleep, and soothing emotions; it is known as an "air vitamin." Odor removal: Negative oxygen ions can react with positively charged odor molecules in the air (such as formaldehyde, ammonia, hydrogen sulfide, etc.), decomposing them into odorless and harmless carbon dioxide and water.

[0003] Currently, there are various types of negative ion generators and products on the market. Among them, spray formulations are popular due to their ease of use, direct action, and ability to combine with other active ingredients. However, existing negative ion spray formulations generally suffer from the following technical defects and limitations: The negative ion source is singular and the effect is unstable: Most existing products rely on a single type of negative ion material (such as tourmaline). The amount of ions released is greatly affected by the ambient temperature and humidity and the fineness of the particles. The release is unstable, the effective duration is short, and the phenomenon of instantaneous high concentration and rapid decay is prominent, making it difficult to maintain a long-term air improvement effect.

[0004] The active ingredients have limited functions and lack synergistic effects: Most products only release negative oxygen ions, which is a single function. A few products that add fragrances or plant extracts are only used to mask odors or provide a temporary aroma. Their active ingredients (such as plant essential oils) evaporate too quickly and are easily oxidized and decomposed, which cannot match the negative ion release curve and fail to achieve the dual effects of long-lasting and synergistic active purification and continuous freshness.

[0005] Safety hazards of chemically synthesized release agents: Some technologies generate negative ions by electrolyzing water or adding chemical ionizing agents (such as chloride salts and radioactive minerals mentioned in some patents). This produces harmful byproducts such as ozone and nitrogen oxides, posing a risk of chemical residue. Long-term use in enclosed spaces may pose a potential threat to the human respiratory system, contradicting the original intention of a healthy life. Summary of the Invention

[0006] The purpose of this invention is to provide a preparation process for a negative oxygen ion release agent loaded with phytoncides on a porous carrier. By using microencapsulation technology, plant extracts are encapsulated, overcoming the defects of phytoncides being volatile and unstable, and achieving long-term release of negative oxygen ion release agents.

[0007] Another objective of this invention is to provide a porous carrier-loaded phytoncides-releasing negative oxygen ion agent with a two-level core-shell structure. The nanoscale pores of mesoporous silica can serve as a loading carrier for plant extracts and provide a large loading surface area. The wall material of the sodium alginate-chitosan composite microcapsules controls the release rate of the active ingredients of the plant extracts inside.

[0008] The technical problem solved by this invention is achieved by the following technical solution.

[0009] On one hand, embodiments of the present invention provide a preparation process for a negative oxygen ion releasing agent loaded with phytoncides on a porous carrier, comprising the following steps: Phytoncide-containing plant extracts were dissolved in an ethanol-water solution, and then activated mesoporous silica was added. The mixture was ultrasonically treated for 2-2.5 hours, filtered, and vacuum dried to obtain mesoporous silica core powder loaded with phytoncide. Prepare an aqueous solution of sodium alginate; disperse the core material powder in the aqueous solution of sodium alginate, homogenize at high speed for 5-10 min to obtain a suspension; Prepare a calcium chloride aqueous solution; while stirring, add the suspension dropwise to the calcium chloride aqueous solution, and stir for 20-30 minutes after the addition is complete. Filter to collect the microspheres, wash them, and obtain calcium alginate gel microspheres. Prepare a chitosan acetate solution and adjust the pH to 5.0; add calcium alginate gel microspheres to the chitosan acetate solution, shake and react at room temperature for 1-1.5 h, adjust the pH of the system to 6.5, and continue to solidify for 20-30 min; collect the microcapsules by centrifugation, wash, freeze dry, and obtain microcapsule powder; Glycerin and Tween-80 are added to water and ultrasonically dispersed evenly. Then, microcapsule powder is added and magnetically stirred until evenly dispersed. The pH of the system is adjusted to 6.0, and the mixture is filtered through a microporous membrane to obtain the negative oxygen ion releasing agent.

[0010] In some embodiments of the present invention, the mesoporous silica has a specific surface area of ​​800-900 m² / g and a pore size of 2-3 nm. In some embodiments of the present invention, the plant extract is at least one of pine needle extract, cypress leaf extract, and eucalyptus leaf extract.

[0011] In some embodiments of the present invention, the preparation method of the plant extract includes the following steps: crushing the plant raw material, loading it into the sieve plate of the distillation kettle, passing steam through it for steam distillation, separating the condensate stream, collecting the upper oil phase, dehydrating and drying it to obtain the plant extract; wherein, the mass ratio of plant raw material to steam is 1:8-1:12, the distillation time is 4-8 hours, and the steam pressure is 0.04-0.05 MPa. In some embodiments of the present invention, the mass ratio of the mesoporous silica to the plant extract is 1:2-2:1. In some embodiments of the present invention, the mass-volume fraction of the sodium alginate aqueous solution is 1.5-2.5%, and the ratio of the core material powder to the sodium alginate aqueous solution is (0.01-0.03) g: 1 mL.

[0012] In some embodiments of the present invention, the mass-volume fraction of the calcium chloride aqueous solution is 2-4%, the volume ratio of the suspension to the calcium chloride aqueous solution is 1:3-1:5, and the dropping rate is 5-10 mL / min.

[0013] In some embodiments of the present invention, the mass-volume fraction of the chitosan acetate solution is 0.8-1.5%, and the mass-volume ratio of calcium alginate gel microspheres to chitosan acetate solution is 1g:8mL-1g:15mL.

[0014] In some embodiments of the present invention, based on 100 mL of negative oxygen ion releasing agent, it includes 4.0-8.0 g of microcapsule powder, 3.0-5.0 mL of glycerol, 0.2-0.5 g of Tween-80, and the balance being deionized water.

[0015] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: The preparation method provided by this invention utilizes microencapsulation technology to encapsulate plant extracts, overcoming the volatilization and instability of phytoncides and achieving long-lasting release of negative ion release agents. The sodium alginate wall material is hygroscopic and expands moderately in high humidity environments, accelerating the release of phytoncides. The dense chitosan composite layer acts as the primary control barrier, ensuring that phytoncides are released at a stable and controllable rate even in dry environments, guaranteeing long-lasting effects.

[0016] The negative oxygen ion releasing agent provided by this invention has a two-level core-shell structure. The nanoscale pores of mesoporous silica can serve as a loading carrier for plant extracts and provide a large loading surface area, thereby physically adsorbing and immobilizing phytoncides in the plant extracts. The wall material of the sodium alginate-chitosan composite microcapsules controls the release rate of the active ingredients of the plant extracts inside. The wall material and mesoporous silica form a dual structure of adsorption-controlled release, prolonging the release time of phytoncides.

[0017] Mesoporous silica, sodium alginate, chitosan, and plant extracts are all naturally sourced or biodegradable materials. This makes the negative ion release agent environmentally friendly and harmless after use. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to specific embodiments.

[0020] A process for preparing a negative oxygen ion releasing agent with phytoncides loaded on a porous carrier includes the following steps: Phytoncide-containing plant extracts were dissolved in an ethanol-water solution, and then activated mesoporous silica was added. The mixture was ultrasonically treated for 2-2.5 hours, filtered, and vacuum dried to obtain mesoporous silica core powder loaded with phytoncide. Prepare an aqueous solution of sodium alginate; disperse the core material powder in the aqueous solution of sodium alginate, homogenize at high speed for 5-10 min to obtain a suspension; Prepare a calcium chloride aqueous solution; while stirring, add the suspension dropwise to the calcium chloride aqueous solution, and stir for 20-30 minutes after the addition is complete. Filter to collect the microspheres, wash them, and obtain calcium alginate gel microspheres. Prepare a chitosan acetate solution and adjust the pH to 5.0; add calcium alginate gel microspheres to the chitosan acetate solution, shake and react at room temperature for 1-1.5 h, adjust the pH of the system to 6.5, and continue to solidify for 20-30 min; collect the microcapsules by centrifugation, wash, freeze dry, and obtain microcapsule powder; Glycerin and Tween-80 are added to water and ultrasonically dispersed evenly. Then, microcapsule powder is added and magnetically stirred until evenly dispersed. The pH of the system is adjusted to 6.0, and the mixture is filtered through a microporous membrane to obtain the negative oxygen ion releasing agent.

[0021] Sodium alginate has good hydrophilicity and gel properties. The gel microspheres formed by cross-linking with calcium chloride can initially encapsulate the core material. Chitosan, as a cationic polysaccharide, forms a dense composite wall material with sodium alginate through electrostatic interaction. This double-layer wall material can significantly reduce the diffusion rate of phytoncides, thereby solving their defects of volatility and instability.

[0022] The mesoporous silica has a specific surface area of ​​800-900 m² / g and a pore size of 2-3 nm. The plant extract is at least one of pine needle extract, cypress leaf extract, and eucalyptus leaf extract.

[0023] The preparation method of the plant extract includes the following steps: crushing the plant raw material, loading it into the sieve plate of the distillation kettle, passing steam through it for steam distillation, separating the condensate stream, collecting the upper oil phase, dehydrating and drying it to obtain the plant extract; wherein, the mass ratio of plant raw material to steam is 1:8-1:12, the distillation time is 4-8 hours, and the steam pressure is 0.04-0.05 MPa. The main active ingredients in the plant extracts from Pinaceae, Cupressaceae, Eucalyptus and other plants provided in the embodiments of the present invention are volatile terpenoids and their derivatives, which constitute the bioactive basis of phytoncides.

[0024] The main active ingredients in pine needle extract include α-pinene, β-pinene, and limonene. α-pinene and β-pinene are highly volatile, possessing a strong, fresh pine aroma, which is the primary source of the fresh forest scent. They have powerful antibacterial, anti-inflammatory, and invigorating effects. Limonene has a refreshing scent and significant anti-anxiety, antibacterial, and antioxidant activities.

[0025] Cypress leaf extract mainly contains the following active ingredients: juniperene, as well as sesquiterpenes such as cedrol and juniperene; it has a calming woody aroma, and its antibacterial ability (especially antifungal) and sedative and sleep-aiding effects are particularly outstanding.

[0026] Eucalyptus leaf extract mainly contains the following active ingredients: 1,8-cineole, α-pinene, terpineol, etc., which have powerful respiratory tract cleansing, sterilization, and refreshing effects.

[0027] The mass ratio of the mesoporous silica to the plant extract is 1:2-2:1. The sodium alginate aqueous solution has a mass-volume fraction of 1.5-2.5%, and the ratio of the core material powder to the sodium alginate aqueous solution is (0.01-0.03) g: 1 mL.

[0028] The calcium chloride aqueous solution has a mass-volume fraction of 2-4%, the volume ratio of the suspension to the calcium chloride aqueous solution is 1:3-1:5, and the dropping rate is 5-10 mL / min. The chitosan acetate solution has a mass-volume fraction of 0.8-1.5%, and the mass-volume ratio of calcium alginate gel microspheres to chitosan acetate solution is 1g:8mL-1g:15mL.

[0029] Based on 100 mL of negative oxygen ion releasing agent, it includes 4.0-8.0 g of microcapsule powder, 3.0-5.0 mL of glycerin, 0.2-0.5 g of Tween-80, and the remainder is deionized water.

[0030] The features and performance of the present invention will be further described in detail below with reference to embodiments. Example 1 The negative oxygen ion releasing agent of this embodiment is prepared according to the following steps: A mixture of plant extracts containing phytoncides was dissolved in an ethanol aqueous solution (75% by volume), and then activated mesoporous silica (specific surface area 800 m² / g, average pore size 3 nm) was added. The mixture was ultrasonically treated for 2.5 h, filtered, and vacuum dried to obtain mesoporous silica core powder loaded with phytoncides. The mass ratio of mesoporous silica to plant extracts was 1:2.

[0031] Prepare a 2% sodium alginate aqueous solution; disperse the core material powder in the sodium alginate aqueous solution at a core material powder to sodium alginate aqueous solution ratio of 0.03g:1mL, homogenize at high speed for 10min to obtain a suspension; Prepare a 4% calcium chloride aqueous solution by mass volume; add the suspension dropwise to the calcium chloride aqueous solution at a volume ratio of 1:5 while stirring, at a rate of 5 mL / min. After the addition is complete, stir for another 30 min, filter to collect the microspheres, wash, and obtain calcium alginate gel microspheres. A 1% (w / v) chitosan acetate solution was prepared using 1% (w / v) dilute acetic acid, and the pH was adjusted to 5.0. Calcium alginate gel microspheres were added to the chitosan acetate solution at a mass-to-volume ratio of 1 g:8 mL. The mixture was shaken at room temperature for 1.5 h, and the pH was adjusted to 6.5. The mixture was then allowed to solidify for another 30 min. The microcapsules were collected by centrifugation, washed, and freeze-dried to obtain microcapsule powder. Based on 100 mL of negative oxygen ion releasing agent, add 5 mL of glycerol and 0.5 g of Tween-80 to an appropriate amount of water, disperse evenly by ultrasonication, then add 8 g of microcapsule powder, stir magnetically until evenly dispersed, adjust the pH of the system to 6.0, add deionized water to make up to 100 mL, filter through a microporous membrane to obtain the negative oxygen ion releasing agent.

[0032] The preparation method of the plant extract is as follows: Pine needles, cypress leaves, and eucalyptus leaves were crushed and placed separately on the sieve plate of a distillation vessel. Saturated steam was introduced into the bottom of the vessel, and the steam passed through the raw material layer, causing the volatile essential oils in the plant cells to vaporize and form a mixed steam that was distilled out together with the steam. The mixed steam entered the condenser and was cooled into condensate. The condensate flowed into an oil-water separator, and the upper oil phase was collected. Anhydrous sodium sulfate was added, and the mixture was dried and filtered to obtain the plant extract. The mass ratio of plant raw materials to steam was 1:12, the distillation time was 8 hours, and the steam pressure was 0.05 MPa.

[0033] The pine needle extract, cypress leaf extract, and eucalyptus leaf extract obtained by steam distillation were mixed in a volume ratio of 1:1:0.5 to obtain the mixed plant extract used in this embodiment.

[0034] Example 2 The difference from Example 1 is that, based on 100 mL of negative oxygen ion releasing agent, 3 mL of glycerol and 0.2 g of Tween-800 were added to an appropriate amount of water, ultrasonically dispersed evenly, then 4 g of microcapsule powder was added, magnetically stirred until evenly dispersed, the pH of the system was adjusted to 6.0, and deionized water was added to make up to 100 mL. The remaining steps are the same as in Example 1.

[0035] Example 3 The difference from Example 1 is that, based on 100 mL of negative oxygen ion releasing agent, 4 mL of glycerol and 0.35 g of Tween-800 were added to an appropriate amount of water, ultrasonically dispersed until uniform, then 6 g of microcapsule powder was added, magnetically stirred until uniformly dispersed, the pH of the system was adjusted to 6.0, and deionized water was added to make up to 100 mL. The remaining steps are the same as in Example 1.

[0036] Example 4 The difference from Example 1 is that the mixed plant extracts used are pine needle extract, cypress leaf extract, and eucalyptus leaf extract mixed in a volume ratio of 1:1:1. The remaining steps are the same as in Example 1.

[0037] Example 5 The difference from Example 1 is that the mixed plant extracts used are pine needle extract, cypress leaf extract, and eucalyptus leaf extract mixed in a volume ratio of 2:1:1. The remaining steps are the same as in Example 1.

[0038] Example 6 The difference from Example 1 is that the mass ratio of mesoporous silica to mixed plant extracts is 2:1. The remaining steps are the same as in Example 1.

[0039] Example 7 The difference from Example 1 is that the mass ratio of mesoporous silica to mixed plant extracts is 1:1. The remaining steps are the same as in Example 1.

[0040] Example 8 The difference from Example 1 is that the ratio of the core material powder to the sodium alginate aqueous solution is 0.01 g: 1 mL. The remaining steps are the same as in Example 1.

[0041] Example 9 The difference from Example 1 is that the ratio of the core material powder to the sodium alginate aqueous solution is 0.02 g: 1 mL. The remaining steps are the same as in Example 1.

[0042] Comparative Example 1 A mixture of plant extracts containing phytoncides was dissolved in an ethanol aqueous solution (75% by volume), and then activated mesoporous silica (specific surface area 800 m² / g, average pore size 3 nm) was added. The mixture was ultrasonically treated for 2.5 h, filtered, and vacuum dried to obtain mesoporous silica core powder loaded with phytoncides. The mass ratio of mesoporous silica to plant extracts was 1:2.

[0043] Based on 100 mL of negative oxygen ion releasing agent, add 5 mL of glycerol and 0.5 g of Tween-80 to an appropriate amount of water, disperse evenly by ultrasonication, then add the core material powder (the mass of the added core material powder is the same as the mass of the core material powder contained in the 8 g microcapsule powder in Example 1), stir magnetically until evenly dispersed, adjust the pH of the system to 6.0, add deionized water to make up to 100 mL, filter through a microporous membrane, and the negative oxygen ion releasing agent is obtained.

[0044] Comparative Example 2 Based on 100 mL of negative oxygen ion releasing agent, add 5 mL of glycerin and 0.5 g of Tween-80 to an appropriate amount of water, disperse evenly by ultrasonication, then add mixed plant extract (the mass of the mixed plant extract added is the same as the mass of the mixed plant extract contained in the 8 g microcapsule powder in Example 1), stir magnetically until evenly dispersed, adjust the pH of the system to 6.0, add deionized water to make up to 100 mL, filter through a microporous membrane to obtain the negative oxygen ion releasing agent.

[0045] Experimental Example Based on the negative oxygen ion releasing agents of the above embodiments and comparative examples, tests were conducted as follows. Each set of data was tested three times, and the average value was taken. The results are shown in Table 1 and Table 2.

[0046] 1. Average particle size of microcapsules: determined by laser particle size analyzer.

[0047] 2. Encapsulation efficiency: The total amount of phytoncide in the microcapsules was determined by solvent extraction / the total amount of phytoncide added × 100%.

[0048] 3. Release curves: The cumulative release rate of phytoncides at different time points was determined in the release medium using a Franz diffusion cell at 37°C and RH 60%.

[0049] 2-hour release rate: reflects the initial "burst release" effect.

[0050] 24-hour release rate: reflects the ability to release continuously in the short to medium term.

[0051] Release half-life (T50%): The time required for 50% release, characterizing sustained-release efficiency.

[0052] 3. Negative oxygen ion release concentration: In a 1m³ sealed test chamber (initial ambient negative oxygen ion concentration ≤50 ions / cm³, temperature 25±2℃, humidity 60±5%RH), 1mL of sample was sprayed evenly, and the concentration at a distance of 50cm from the nozzle was monitored using an air negative ion detector. The peak concentration and the average concentration 1 hour after spraying were recorded.

[0053] 4. Antibacterial activity: Using the inhibition zone method, the bacterial concentration was 1×10⁻⁶. 6 The concentration of CFU / mL was used to test the inhibitory effect against Staphylococcus aureus (G+) and Escherichia coli (G-). The larger the diameter of the inhibition zone, the stronger the antibacterial activity.

[0054] 5. Accelerated stability: After being placed at 40℃ and 75% relative humidity for 30 days, the retention rate of phytoncides was determined.

[0055] Table 1

[0056] Table 2

[0057] As shown in Table 1, the phytoncide release half-cycle of the embodiment was significantly longer than that of the comparative example, with the sustained-release time increased by more than 12 times. The low initial release amount in the embodiment is due to the encapsulation effect of the wall material, which reduces the initial release amount of phytoncide.

[0058] Comparative Example 2 (Pure Extract): In its unprotected, pristine state, release was entirely driven by volatilization and was the fastest. Comparative Example 1 (Loaded Core Material): The physical adsorption of mesoporous silica provided some resistance, resulting in a slightly slower release, but lacking an outer barrier, it still diffused rapidly.

[0059] The release mechanism of the negative oxygen ion releasing agent in this invention is as follows: phytoncides molecules first desorb from mesoporous silica, and then diffuse to the outside through a hydrated and swollen gel network. Microencapsulation enables phytoncides to be released stably and controllably over 12 hours.

[0060] Compared to the most unstable pure extract (Comparative Example 2), the stability of the release agent in the examples was improved by 80%; compared to the core material powder with single adsorption protection (Comparative Example 1), it was improved by 30%.

[0061] Negative ion release performance: The average concentration after 1 hour in the example (312-595 ions / cm³) was 10-20 times that of the comparative example (<30 ions / cm³). The microcapsule system, as a stable dispersion matrix, prevented the agglomeration and sedimentation of the negative ion mineral powder, ensuring its effective surface area and continuous ionization capacity.

[0062] The antibacterial rings in the examples were on average 5-7 mm larger than those in the comparative examples. This not only involved sustained release of phytoncides but also the addition of the inherent, long-lasting positively charged antibacterial activity of chitosan, achieving spatiotemporal synergy of different antibacterial mechanisms (membrane disruption, intracellular action).

[0063] The embodiments described above are some, but not all, embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A preparation process for a negative oxygen ion releasing agent loaded with phytoncides on a porous carrier, characterized in that, Includes the following steps: Phytoncide-containing plant extracts were dissolved in an ethanol-water solution, and then activated mesoporous silica was added. The mixture was ultrasonically treated for 2-2.5 hours, filtered, and vacuum dried to obtain mesoporous silica core powder loaded with phytoncide. Prepare an aqueous solution of sodium alginate; disperse the core material powder in the aqueous solution of sodium alginate, homogenize at high speed for 5-10 min to obtain a suspension; Prepare a calcium chloride aqueous solution; while stirring, add the suspension dropwise to the calcium chloride aqueous solution, and stir for 20-30 minutes after the addition is complete. Filter to collect the microspheres, wash them, and obtain calcium alginate gel microspheres. Prepare a chitosan acetate solution and adjust the pH to 5.0; add calcium alginate gel microspheres to the chitosan acetate solution, shake and react at room temperature for 1-1.5 h, adjust the pH of the system to 6.5, and continue to solidify for 20-30 min; collect the microcapsules by centrifugation, wash, freeze dry, and obtain microcapsule powder; Glycerin and Tween-80 are added to water and ultrasonically dispersed evenly. Then, microcapsule powder is added and magnetically stirred until evenly dispersed. The pH of the system is adjusted to 6.0, and the mixture is filtered through a microporous membrane to obtain the negative oxygen ion releasing agent.

2. The preparation process of the negative oxygen ion releasing agent loaded with phytoncides on a porous carrier according to claim 1, characterized in that, The mesoporous silica has a specific surface area of ​​800-900 m² / g and a pore size of 2-3 nm.

3. The preparation process of the negative oxygen ion releasing agent loaded with phytoncides on a porous carrier according to claim 1, characterized in that, The plant extract is at least one of pine needle extract, cypress leaf extract, and eucalyptus leaf extract.

4. The preparation process of the negative oxygen ion releasing agent loaded with phytoncides on a porous carrier according to claim 1, characterized in that, The mass ratio of the mesoporous silica to the plant extract is 1:2-2:

1.

5. The preparation process of the negative oxygen ion releasing agent loaded with phytoncides on a porous carrier according to claim 1, characterized in that, The sodium alginate aqueous solution has a mass-volume fraction of 1.5-2.5%, and the ratio of the core material powder to the sodium alginate aqueous solution is (0.01-0.03) g: 1 mL.

6. The preparation process of the negative oxygen ion releasing agent loaded with phytoncides on a porous carrier according to claim 1, characterized in that, The preparation method of the plant extract includes the following steps: crushing the plant raw material, loading it into the sieve plate of the distillation kettle, passing steam to carry out steam distillation, separating the condensate stream, collecting the upper oil phase, dehydrating and drying it to obtain the plant extract. The mass ratio of plant material to steam is 1:8 to 1:12, the distillation time is 4 to 8 hours, and the steam pressure is 0.04 to 0.05 MPa.

7. The preparation process of the negative oxygen ion releasing agent loaded with phytoncides on a porous carrier according to claim 1, characterized in that, The calcium chloride aqueous solution has a mass-volume fraction of 2-4%, the volume ratio of the suspension to the calcium chloride aqueous solution is 1:3-1:5, and the dropping rate is 5-10 mL / min.

8. The preparation process of the negative oxygen ion releasing agent loaded with phytoncides on a porous carrier according to claim 1, characterized in that, The mass-volume fraction of the chitosan acetate solution is 0.8-1.5%, and the mass-volume ratio of calcium alginate gel microspheres to chitosan acetate solution is 1g:8mL-1g:15mL.

9. The preparation process of the negative oxygen ion releasing agent loaded with phytoncides on a porous carrier according to claim 6, characterized in that, Based on 100 mL of negative oxygen ion releasing agent, it includes 4.0-8.0 g of microcapsule powder, 3.0-5.0 mL of glycerin, 0.2-0.5 g of Tween-80, and the remainder is deionized water.

10. A negative oxygen ion releasing agent with phytoncides loaded on a porous carrier, characterized in that, It is prepared by the preparation process described in any one of claims 1-9.

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