Antibacterial agilawood and preparation method thereof

Abstract

The present application relates to incense technology field, provide a kind of bacteriostatic black eagle and its preparation method, solve the plant extract antibacterial agent used in existing incense technology is easy to inactivation, poor fire-retardant effect, easy to cause scald, bacteriostatic and low smoke safety performance is difficult to take into account the problem;Including incense body, the incense body includes successively from inside to outside: inner layer, middle layer and outermost layer;The inner layer includes the following weight parts of raw materials: 25-35 parts hybrid bacteriostatic agent, 10-15 parts adhesive, 5-10 parts combustion improver;The middle layer includes the following weight parts of raw materials: 50-65 parts black eagle mixed powder, 20-30 parts plant powder, 5-10 parts combustion improver;The outermost layer includes the following weight parts of raw materials: 25-35 parts fire-retardant mineral powder, 15-25 parts smokeless carbon powder, 10-15 parts adhesive, 3-8 parts combustion improver.

Description

Technical Field

[0001] This invention relates to the field of incense technology, and in particular to an antibacterial agarwood and its preparation method. Background Technology

[0002] Incense, as a traditional cultural product and daily consumer good, is widely used in religious ceremonies, home fragrance dissemination, and air purification. However, with consumers increasingly valuing indoor air quality and healthy living, the problem of traditional incense burning producing large amounts of tar and particulate matter (PM2.5) urgently needs to be addressed.

[0003] To address this, existing technologies attempt to improve incense performance through two routes: raw material substitution and process optimization. Chinese Patent Publication No. CN116850329A discloses a smokeless incense containing fragrant plants and its preparation method. This method introduces extracts from fragrant plants such as ginger flower to prepare smokeless incense, utilizing the pleasant aroma of plant volatile oils to mask odors and improving indoor air quality through their natural antibacterial and insect-repellent activities. This type of solution uses natural components and is simple to prepare, reducing the irritation of smoke to some extent. However, its antibacterial function relies entirely on heat-sensitive plant essential oils, which are highly volatile and prone to pyrolysis and ablation in the smoldering environment of 300℃-600℃. It only provides a brief antibacterial effect in the early stages of combustion and cannot achieve sustained antibacterial activity in the later stages. Furthermore, its single-layer homogeneous structure lacks a dedicated flame-retardant layer, resulting in loose and easily scattered ash after combustion, posing a safety hazard of tipping and ignition.

[0004] Furthermore, regarding the synergistic optimization of smoke and antibacterial properties, Chinese Patent Publication No. CN112957506A discloses a smokeless incense for indoor use and its preparation method. This method recovers plant-based active ingredients through a process of incomplete combustion-solution absorption-alcohol extraction, and employs a grid-like cross-section design to promote complete combustion. While this solution reduces smoke and tar emissions to some extent, its antibacterial system remains limited to herbal extracts (Artemisia argyi, lemon eucalyptus, patchouli, etc.), essentially still belonging to heat-sensitive organic antibacterial agents, and thus faces the problem of rapid deactivation during high-temperature smoldering. In addition, this solution does not incorporate a flame-retardant system, resulting in significant safety deficiencies. Summary of the Invention

[0005] Therefore, in view of the above problems, the present invention provides an antibacterial agarwood and its preparation method, which solves the problems that the plant extract antibacterial agents used in the existing incense burning technology are easy to be deactivated, have poor flame retardant effect, are easy to cause burns, and are difficult to achieve both antibacterial and low smoke safety performance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An antibacterial agarwood, comprising a fragrance body, which, from the inside out, comprises: an inner layer, a middle layer, and an outermost layer; the inner layer comprises the following raw materials in parts by weight: 25-35 parts of hybrid antibacterial agent, 10-15 parts of binder, and 5-10 parts of combustion aid; the middle layer comprises the following raw materials in parts by weight: 50-65 parts of agarwood mixed powder, 20-30 parts of plant binder powder, and 5-10 parts of combustion aid; the outermost layer comprises the following raw materials in parts by weight: 25-35 parts of flame-retardant mineral powder, 15-25 parts of smokeless charcoal powder, 10-15 parts of binder, and 3-8 parts of combustion aid; The hybrid antibacterial agent comprises the following raw materials in parts by weight: 20-30 parts fish scale biochar, 10-20 parts sepiolite powder, 3-8 parts chitosan, 1-5 parts zinc nitrate hexahydrate, and 2-6 parts crosslinking agent. The agarwood and ginseng mixed powder is composed of the following raw materials in parts by weight: 20-30 parts agarwood, 15-25 parts costus root, 10-20 parts Lindera root, 10-15 parts cinnamon, and 5-10 parts Nardostachys chinensis. The flame-retardant mineral powder comprises the following raw materials in parts by weight: 35-45 parts wollastonite powder, 25-35 parts borosilicate glass powder, 8-12 parts alumina micro powder, and 3-6 parts expanded graphite.

[0007] Furthermore, the preparation process of the hybrid antibacterial agent is as follows: a. Add zinc nitrate hexahydrate to deionized water to prepare a metal salt solution with a concentration of 0.5 mol / L-1.5 mol / L for later use; b. Add chitosan to an aqueous acetic acid solution, stir to dissolve, and prepare a chitosan-acetic acid solution with a mass concentration of 0.5%-2% for later use; c. Fish scale biochar and sepiolite powder are added to deionized water and ultrasonically dispersed. Then, a metal salt solution is added dropwise and the mixture is stirred and reacted at 60℃-80℃ to obtain a composite suspension loaded with zinc ions. d. Add chitosan acetate solution to the composite suspension, stir and mix, then add crosslinking agent dropwise to carry out crosslinking reaction. After solid-liquid separation, washing, drying and pulverizing, a hybrid antibacterial agent is obtained. The fish scale biochar is obtained by washing and drying waste fish scales and then performing oxygen-limited pyrolysis.

[0008] Fish scale biochar possesses a porous structure and high specific surface area, giving it excellent adsorption capacity and enabling it to physically adsorb large tar molecules in flue gas. Simultaneously, its surface retains the natural hydroxyapatite crystal phase and is rich in -OH and -PO4 groups. 3-These groups can undergo ion exchange or coordination with metal ions, fixing the metal ions onto the carbon framework. Furthermore, preparing fish scale biochar from waste fish scales effectively utilizes waste resources and reduces environmental pollution.

[0009] Sepiolite powder is a natural magnesium silicate clay mineral that forms a dual-channel adsorption system with fish-scale biochar. In the preparation of hybrid antibacterial agents, it serves as a dispersion medium to prevent biochar agglomeration and make the metal ion loading more uniform. Moreover, it is inexpensive and can reduce production costs.

[0010] Chitosan is a natural antibacterial agent. In the high-temperature smoldering environment of incense, chitosan undergoes pyrolysis to generate nitrogen-containing heterocyclic compounds (such as pyrazines) with gas-phase antibacterial activity. Through cross-linking agents, it forms a three-dimensional network that is insoluble in water, fixing itself and the zinc ions it carries within the pores of biochar and sepiolite, thus solving the problem of chitosan's instantaneous high-temperature ablation failure when simply mixed.

[0011] Zinc nitrate hexahydrate reacts with phosphate ions on the surface of biochar to form Zn3(PO4)2 or ZnO precursors, which are then converted into nano-ZnO upon combustion. Zinc oxide continuously releases Zn from incense ash. 2+ It provides antibacterial properties.

[0012] Furthermore, the cross-section of the fragrance body has a concentric circle structure; wherein the thickness of the inner layer is 0.8mm-1.5mm, the thickness of the middle layer is 1.0mm-1.8mm, and the thickness of the outermost layer is 0.5mm-1.0mm.

[0013] Furthermore, the crosslinking agent is one or a mixture of two or more of sodium tripolyphosphate, sodium pyrophosphate, or sodium hexametaphosphate in any proportion.

[0014] Furthermore, the adhesive is a mixture of one or more of elm bark powder, nanmu powder, or gum arabic in any proportion; the combustion aid is a mixture of one or two of potassium nitrate or sodium nitrate in any proportion.

[0015] The above-described method for preparing antibacterial agarwood includes the following steps: S1. Preparation of inner layer slurry: Weigh out the hybrid antibacterial agent, adhesive, and combustion aid by weight, mix with 20-30 parts of water, and prepare a fluid inner layer slurry. S2. Preparation of intermediate layer slurry: Weigh out the mixed powder of agarwood, plant adhesive powder and combustion aid by weight, and mix with 25-35 parts of water to prepare a fluid intermediate layer slurry. S3. Preparation of the outermost slurry: Weigh the flame-retardant mineral powder, smokeless carbon powder, binder, and combustion aid by weight, and mix them with 20-30 parts of water to prepare a fluid outermost slurry. S4. Multi-layer co-extrusion molding: Using a concentric extrusion die, the inner layer slurry, the middle layer slurry and the outermost layer slurry are extruded sequentially from the inside to the outside to form a three-layer composite wet preform; S5. Head Ignition Treatment: Mix potassium chlorate, sulfur powder, charcoal powder and binder, add solvent to prepare ignition paste, and evenly apply the ignition paste to one end of the three-layer composite wet blank, with a coating length of 3%-5% of the total length of the fragrance body; S6. Drying and post-treatment: After the wet blank is treated in step S5, avoid the end area coated with ignition paste, roll mica pearl powder on the remaining surface to attach a metallic luster layer to the surface of the wet blank, and then place it in a constant temperature and humidity environment for low-temperature slow drying to obtain antibacterial agarwood.

[0016] Furthermore, in step S6, the conditions for low-temperature slow drying are: temperature controlled at 40℃-60℃, relative humidity controlled at 30%-50%, and drying time at 48 hours-72 hours.

[0017] By adopting the aforementioned technical solution, the beneficial effects of the present invention are as follows: 1. Fish scale biochar prepared from waste fish scales not only possesses a large specific surface area and abundant porous structure, but its naturally loaded hydroxyapatite provides specific adsorption sites for metal ions. By introducing metal salts and cross-linking them with a cross-linking agent in the synergy of chitosan, a ternary hybrid network is formed. This structure not only overcomes the shortcomings of traditional silver-based antibacterial agents, such as high cost and easy precipitation of heavy metals, but also endows the antibacterial agent with unique thermal stability. Under the high-temperature smoldering environment of incense, chitosan undergoes pyrolysis to generate nitrogen-containing heterocyclic compounds with gas-phase antibacterial activity. Simultaneously, zinc ions are converted into zinc oxide nanoparticles to continuously exert antibacterial effects. Combined with the physical adsorption of tar and macromolecular impurities in the flue gas by biochar, the dual effects of pyrolysis antibacterial action and physical adsorption are achieved. 2. Unlike conventional techniques that use kaolin or diatomaceous earth for physical insulation, this invention employs a borosilicate / wollastonite composite flame-retardant powder as the outermost layer, which exhibits a ceramicizing effect at the burning temperature. The borosilicate glass powder melts in the 450℃-550℃ range, forming a liquid phase that wets the wollastonite powder and alumina micropowder. This liquid phase fills the surface of the incense burner and bonds it to the interface, forming a ceramicized glaze ash. This glaze layer has an extremely low thermal conductivity, effectively isolating internal heat from the outside and preventing ignition of the contact surface when the incense burner is tilted. Simultaneously, the expanded graphite expands at high temperatures to form a worm-like char layer, further blocking oxygen and giving the incense burner excellent self-extinguishing properties. Furthermore, this ceramicized ash is not loose, solving the safety hazard of burns caused by easily scattered incense ash in traditional burning incense. 3. By designing a three-layer concentric structure for the fragrance, the inner layer is rich in hybrid antibacterial agents to ensure the concentrated release of antibacterial components; the middle layer is composed of agarwood mixed powder to ensure the purity and richness of the aroma; the outermost layer maintains the stability of combustion through a reasonable ratio of flame-retardant mineral powder and smokeless charcoal powder. 4. Using mica pearlescent powder to modify the surface of the fragrance, combined with the natural color of the ceramic glaze, can enhance the commercial appearance of the product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of antibacterial agarwood in an embodiment of the present invention; The labels in the diagram are: inner layer 1, middle layer 2, outermost layer 3. Detailed Implementation

[0019] Example 1

[0020] refer to Figure 1 An antibacterial agarwood, comprising a fragrance body, wherein the fragrance body comprises, from the inside out, an inner layer 1, a middle layer 2 and an outermost layer 3; the cross-section of the fragrance body is a concentric circle structure; wherein the thickness of the inner layer 1 is 1.2 mm, the thickness of the middle layer 2 is 1.4 mm, and the thickness of the outermost layer 3 is 0.8 mm. The inner layer comprises the following raw materials in parts by weight: 30 parts hybrid antibacterial agent, 12 parts elm bark powder, and 8 parts potassium nitrate; the middle layer comprises the following raw materials in parts by weight: 55 parts agarwood mixed powder, 25 parts plant adhesive powder, and 8 parts potassium nitrate; the outermost layer comprises the following raw materials in parts by weight: 30 parts flame-retardant mineral powder, 20 parts smokeless charcoal powder, 12 parts elm bark powder, and 5 parts combustion aid; The hybrid antibacterial agent comprises the following raw materials in parts by weight: 25 parts fish scale biochar, 15 parts sepiolite powder, 5 parts chitosan, 3 parts zinc nitrate hexahydrate, and 4 parts crosslinking agent. The agarwood powder is composed of the following raw materials in parts by weight: 25 parts agarwood, 20 parts costus root, 15 parts Lindera root, 12 parts cinnamon, and 8 parts Nardostachys jatamansi. The flame-retardant mineral powder comprises the following raw materials in parts by weight: 40 parts wollastonite powder, 30 parts borosilicate glass powder, 10 parts alumina micro powder, and 5 parts expanded graphite.

[0021] The preparation process of the hybrid antibacterial agent is as follows: a. Add 3 parts of zinc nitrate hexahydrate to deionized water to prepare a 1 mol / L metal salt solution for later use; b. Add 5 parts of chitosan to an aqueous acetic acid solution, stir to dissolve, and prepare a 1% chitosan-acetic acid solution for later use; c. Add 25 parts of fish scale biochar and 15 parts of sepiolite powder to 200 parts of deionized water and disperse by ultrasonication. Then add the metal salt solution prepared in step a dropwise and stir at 70°C for 2 hours to obtain a composite suspension loaded with zinc ions. d. Add the chitosan acetate solution prepared in step b to the composite suspension, stir and mix, then add a 10% sodium tripolyphosphate aqueous solution dropwise to carry out the cross-linking reaction. After reacting for 1 hour, the mixture is separated into solid and liquid, washed, dried and pulverized and sieved to obtain the hybrid antibacterial agent. The fish scale biochar is obtained by washing and drying waste fish scales and then performing oxygen-limited pyrolysis.

[0022] The above-described method for preparing antibacterial agarwood includes the following steps: S1. Preparation of inner layer slurry: Weigh out the hybrid antibacterial agent, adhesive, and combustion aid by weight, mix with 25 parts of water, and prepare a fluid inner layer slurry. S2. Preparation of intermediate layer slurry: Weigh out the mixed powder of agarwood, plant adhesive powder and combustion aid by weight, mix with 30 parts of water, and prepare a fluid intermediate layer slurry. S3. Preparation of the outermost slurry: Weigh the flame-retardant mineral powder, smokeless carbon powder, binder, and combustion aid by weight, mix with 20 parts of water, and prepare a fluid outermost slurry. S4. Multi-layer co-extrusion molding: Using a concentric extrusion die, the inner layer slurry, the middle layer slurry and the outermost layer slurry are extruded sequentially from the inside to the outside to form a three-layer composite wet preform; S5. Head Ignition Treatment: Mix potassium chlorate, sulfur powder, charcoal powder and binder, add solvent to prepare ignition paste, and evenly apply the ignition paste to one end of the three-layer composite wet blank, with a coating length of 3% of the total length of the fragrance body; S6. Drying and post-treatment: After the wet blank is treated in step S5, avoiding the end area coated with ignition paste, roll on mica pearlescent powder on the remaining surface to attach a metallic luster layer to the surface of the wet blank. Then place it in a constant temperature and humidity environment for low-temperature slow drying to obtain antibacterial agarwood. The conditions for the low-temperature slow drying are: temperature controlled at 50℃, relative humidity controlled at 40%, and drying time at 72 hours.

[0023] Example 2 The difference from Example 1 is as follows: An antibacterial agarwood, comprising a fragrance body, wherein the fragrance body comprises, from the inside out, an inner layer, a middle layer and an outermost layer; the cross-section of the fragrance body is a concentric circle structure; wherein the thickness of the inner layer is 1.5 mm, the thickness of the middle layer is 1.8 mm, and the thickness of the outermost layer is 0.8 mm.

[0024] The above-described method for preparing antibacterial agarwood includes the following steps: S1. Preparation of inner layer slurry Mix 35 parts of hybrid antibacterial agent, 10 parts of gum arabic, 10 parts of potassium nitrate, and 30 parts of water to prepare a fluid inner layer slurry; The hybrid antibacterial agent comprises the following raw materials in parts by weight: 25 parts fish scale biochar, 15 parts sepiolite powder, 8 parts chitosan, 5 parts zinc nitrate hexahydrate, and 4 parts crosslinking agent. S3, Prepare the outermost slurry Mix 30 parts flame-retardant mineral powder, 20 parts smokeless charcoal powder, 10 parts gum arabic, 8 parts potassium nitrate, and 25 parts water to prepare a fluid outermost slurry. The flame-retardant mineral powder comprises the following raw materials in parts by weight: 40 parts wollastonite powder, 30 parts borosilicate glass powder, 15 parts alumina micro powder, and 3 parts expanded graphite.

[0025] Other technical solutions are the same as in Example 1.

[0026] Example 3 The difference from Example 1 is as follows: S3, Prepare the outermost slurry Mix 30 parts flame-retardant mineral powder, 20 parts smokeless charcoal powder, 12 parts elm bark powder, 8 parts potassium nitrate, and 25 parts water to prepare a fluid outermost slurry. The flame-retardant mineral powder comprises the following raw materials in parts by weight: 35 parts wollastonite powder, 25 parts borosilicate glass powder, 8 parts alumina micro powder, and 8 parts expanded graphite. S5, Head Ignition Treatment Mix 15 parts potassium chlorate, 5 parts sulfur powder, 10 parts charcoal powder, and 6 parts gum arabic, and add ethanol solvent to prepare an ignition paste. Apply the ignition paste evenly to one end of the three-layer composite wet blank, with a coating length of 5% of the total length of the fragrance body.

[0027] Comparative Example 1 The difference from Example 1 is that a single-layer incense structure is used; no inner layer slurry is prepared; 55 parts of agarwood mixed powder, 25 parts of nanmu powder, 8 parts of potassium nitrate and 30 parts of water are mixed to form a fluid slurry, which is then extruded using a single-hole extrusion mold without covering the outer layer.

[0028] The products prepared in Examples 1-3 and Comparative Example 1 were subjected to performance tests, and the test results are shown in Table 1.

[0029] (1) Antibacterial performance test of inner layer slurry The inner layer slurry was dried at 60℃ to constant weight, pulverized and passed through a 100-mesh sieve, and then mixed with sterile physiological saline to prepare a 0.2 g / mL fragrance powder suspension. The suspensions of *Escherichia coli* and *Staphylococcus aureus* (10...) were then added... 6 Take 100 μL of each of the following (CFU / mL) and spread them evenly on the surface of a nutrient agar plate: take 0.1 mL of the fragrance powder suspension and spread it evenly on the surface of the plate. Use ordinary fragrance powder (without antibacterial agent) as a negative control. After incubating at 37℃ for 18 hours, measure the diameter of the inhibition zone.

[0030] (2) Flue gas antibacterial performance test Referring to the cloth strip method in QB / T 5881-2023 "Test Method for Sterilization of Incense Products", a sterilized cloth strip containing E. coli was suspended in a sealed glass test chamber with dimensions of 0.7m × 0.7m × 0.7m. The incense to be tested was lit and suspended in the center of the test chamber, and the chamber door was immediately sealed. After 1 hour of treatment, the cloth strip was removed and placed in a buffer solution containing 10mL of neutralizing agent. The strip was then shaken and eluted, and the number of surviving bacteria was determined. The inhibition rate (%) was calculated. The test was repeated 3 times.

[0031] (3) Test on the antibacterial properties of combustion ash Completely burn the incense to be tested, collect the remaining ash, and sterilize it by dry heat at 121℃ for 1 hour. Weigh 0.5g of the sterilized ash, place it on a sterile filter paper (6mm in diameter), add a small amount of sterile physiological saline to keep it moist, and then apply it to a surface coated with Escherichia coli or Staphylococcus aureus (10 μL). 6 The surface of the plate was incubated with nutrient agar plates containing (CFU / mL). Ordinary incense ash without added antibacterial agent was used as a negative control. After incubation at 37°C for 18 hours, the diameter of the inhibition zone was measured (accurate to 0.1 mm).

[0032] (4) Smoldering rate test Mark the surface of the incense stick every 20 mm. Ignite one end of the incense stick and use a stopwatch to record the time it takes for the flame front to travel from the first mark to the last mark. The smoldering rate (mm / min) = the sum of the mark intervals / the burning time.

[0033] Table 1 As shown in Table 1, the diameters of the inhibition zones of the inner layer slurry in Examples 1, 2, and 3 against Escherichia coli and Staphylococcus aureus were between 15.2 mm and 19.8 mm, respectively, indicating that the fragrance has an effective antibacterial function in the unburned state.

[0034] In simulated real-world flue gas tests, the antibacterial rate of the flue gas in Examples 1-3 reached as high as 90.3%-98.2%. This indicates that during the smoldering process of incense, nitrogen-containing heterocyclic compounds generated by the pyrolysis of chitosan are released with the flue gas, and combined with the physical adsorption of biochar, achieve highly efficient gas-phase antibacterial activity.

[0035] After high-temperature combustion, the ash from Examples 1-3 still maintained an antibacterial zone of 13.5 mm-18.2 mm. This is because the zinc ions in the hybrid antibacterial agent are converted into thermally stable zinc oxide nanoparticles at high temperatures and loaded onto a porous carbon framework formed by fish-scale biochar and expanded graphite. This structure not only withstands high temperatures but also continues to release antibacterial ions after combustion, proving that the antibacterial components still retain residual activity after combustion.

[0036] Regarding the smoldering rate, the smoldering rates of Examples 1-3 of this invention are consistently between 3.0-3.2 mm / min, significantly lower than the 4.8 mm / min of Comparative Example 1. This indicates that the multi-layered structure of this invention (especially the outermost layer of flame-retardant mineral coating) effectively hinders oxygen diffusion and heat transfer, thereby reducing the combustion rate. The slower and more stable smoldering rate not only prolongs the fragrance's lasting time but also reduces the instantaneous release of high-temperature smoke per unit time, further enhancing safety in use.

[0037] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. An antibacterial agarwood, characterized in that, The product includes a fragrance body, which comprises, from the inside out, an inner layer, a middle layer, and an outermost layer. The inner layer comprises the following raw materials in parts by weight: 25-35 parts of hybrid antibacterial agent, 10-15 parts of binder, and 5-10 parts of combustion aid. The middle layer comprises the following raw materials in parts by weight: 50-65 parts of agarwood mixed powder, 20-30 parts of plant binder powder, and 5-10 parts of combustion aid. The outermost layer comprises the following raw materials in parts by weight: 25-35 parts of flame-retardant mineral powder, 15-25 parts of smokeless charcoal powder, 10-15 parts of binder, and 3-8 parts of combustion aid. The hybrid antibacterial agent comprises the following raw materials in parts by weight: 20-30 parts fish scale biochar, 10-20 parts sepiolite powder, 3-8 parts chitosan, 1-5 parts zinc nitrate hexahydrate, and 2-6 parts crosslinking agent. The agarwood and ginseng mixed powder is composed of the following raw materials in parts by weight: 20-30 parts agarwood, 15-25 parts costus root, 10-20 parts Lindera root, 10-15 parts cinnamon, and 5-10 parts Nardostachys chinensis. The flame-retardant mineral powder comprises the following raw materials in parts by weight: 35-45 parts wollastonite powder, 25-35 parts borosilicate glass powder, 8-12 parts alumina micro powder, and 3-6 parts expanded graphite.

2. The antibacterial agarwood according to claim 1, characterized in that, The preparation process of the hybrid antibacterial agent is as follows: a. Add zinc nitrate hexahydrate to deionized water to prepare a metal salt solution with a concentration of 0.5 mol / L-1.5 mol / L for later use; b. Add chitosan to an aqueous acetic acid solution, stir to dissolve, and prepare a chitosan-acetic acid solution with a mass concentration of 0.5%-2% for later use; c. Fish scale biochar and sepiolite powder are added to deionized water and ultrasonically dispersed. Then, a metal salt solution is added dropwise and the mixture is stirred and reacted at 60℃-80℃ to obtain a composite suspension loaded with zinc ions. d. Add chitosan acetate solution to the composite suspension, stir and mix, then add crosslinking agent dropwise to carry out crosslinking reaction. After solid-liquid separation, washing, drying and pulverizing, a hybrid antibacterial agent is obtained. The fish scale biochar is obtained by washing and drying waste fish scales and then performing oxygen-limited pyrolysis.

3. The antibacterial agarwood according to claim 1, characterized in that: The cross-section of the fragrance body has a concentric circle structure; wherein, the thickness of the inner layer is 0.8mm-1.5mm, the thickness of the middle layer is 1.0mm-1.8mm, and the thickness of the outermost layer is 0.5mm-1.0mm.

4. The antibacterial agarwood according to claim 1, characterized in that: The crosslinking agent is one or a mixture of two or more of sodium tripolyphosphate, sodium pyrophosphate, or sodium hexametaphosphate in any proportion.

5. The antibacterial agarwood according to claim 1, characterized in that: The adhesive is a mixture of one or more of elm bark powder, nanmu powder, or gum arabic in any proportion; the combustion aid is a mixture of one or two of potassium nitrate or sodium nitrate in any proportion.

6. The method for preparing an antibacterial agarwood according to claim 1, characterized in that, Includes the following steps: S1. Preparation of inner layer slurry: Weigh out the hybrid antibacterial agent, adhesive, and combustion aid by weight, mix with 20-30 parts of water, and prepare a fluid inner layer slurry. S2. Preparation of intermediate layer slurry: Weigh out the mixed powder of agarwood, plant adhesive powder and combustion aid by weight, and mix with 25-35 parts of water to prepare a fluid intermediate layer slurry. S3. Preparation of the outermost slurry: Weigh the flame-retardant mineral powder, smokeless carbon powder, binder, and combustion aid by weight, and mix them with 20-30 parts of water to prepare a fluid outermost slurry. S4. Multi-layer co-extrusion molding: Using a concentric extrusion die, the inner layer slurry, the middle layer slurry and the outermost layer slurry are extruded sequentially from the inside to the outside to form a three-layer composite wet preform; S5. Head Ignition Treatment: Mix potassium chlorate, sulfur powder, charcoal powder and binder, add solvent to prepare ignition paste, and evenly apply the ignition paste to one end of the three-layer composite wet blank, with a coating length of 3%-5% of the total length of the fragrance body; S6. Drying and post-treatment: After the wet blank is treated in step S5, avoid the end area coated with ignition paste, roll mica pearl powder on the remaining surface to attach a metallic luster layer to the surface of the wet blank, and then place it in a constant temperature and humidity environment for low-temperature slow drying to obtain antibacterial agarwood.

7. The method for preparing an antibacterial agarwood according to claim 6, characterized in that: In step S6, the conditions for low-temperature slow drying are: temperature controlled at 40℃-60℃, relative humidity controlled at 30%-50%, and drying time of 48 hours-72 hours.

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