Agarwood white wood recycled composite filling particle and preparation method thereof

Abstract

A composite filler granule for recycling agarwood and white wood, and its preparation method, are disclosed. The granule comprises a core and a coating covering the outer surface of the core. The granule consists of a core and a functional coating covering it; the core is granulated from agarwood processing waste after essential oil extraction and a binder; the coating contains agarwood essential oil, sleep-aiding plant essential oil, negative ion powder, and silver ion powder. The preparation method includes: sorting waste materials; forming beads from large pieces; crushing small pieces and pre-treating them with pressurized hot water and distilling to extract essential oil; granulating the obtained agarwood residue into powder to form the core; and preparing a coating liquid with self-extracted essential oil and other ingredients, which is then coated onto the core and the surface of the white wood beads. This invention achieves high-value utilization of all components of agarwood waste, and the resulting product possesses aromatic, negative ion release, and antibacterial functions, while the process is green and low-cost. This invention has strong practicality and significant promotional value.

Description

Technical Field

[0001] This invention relates to the fields of agricultural and forestry waste resource utilization and agarwood deep processing technology, and in particular to a composite filler particle for the recycling and regeneration of agarwood and its preparation method. Background Technology

[0002] Agarwood, as a precious traditional Chinese medicine and natural fragrance, holds significant value in both traditional medicine and modern health and wellness. Its essential oil has been proven to possess multiple benefits, including calming the nerves, soothing the mind and body, and antibacterial and deodorizing properties. With increasing demands for sleep health and quality of life, the market demand for pillow filling materials that combine natural fragrance, sleep-aiding and calming effects, and environmental friendliness is growing rapidly.

[0003] However, the processing of agarwood products (such as prayer beads and ornaments) generates a large amount of agarwood scraps (i.e., scraps and waste with extremely low oil content). Traditionally, this raw material is considered to have no direct use value and is usually inefficiently burned or discarded as waste, resulting in a serious waste of precious agarwood resources and potentially causing environmental pressure.

[0004] Currently, there are already health products on the market made from agarwood, such as aromatherapy granules and filler granules. However, most of these products are made directly from high-cost, high-quality agarwood raw materials, resulting in high prices and making them difficult to popularize. More importantly, their manufacturing process is mostly at a rudimentary stage, simply mixing agarwood powder with a binder and then granulating it. The resulting products generally have inherent defects such as low mechanical strength, loose structure, and poor moisture resistance. During storage, transportation, and use, they are easily affected by environmental humidity, becoming damp, powdery, or even growing mold, leading to breakage and dust generation, which seriously affects the product's appearance, user experience, and shelf life.

[0005] Therefore, existing technologies suffer from two main problems: insufficient resource utilization of agarwood scraps and waste materials, and limited functionality, poor performance, and high cost of agarwood-based filler products. Developing a systematic method to transform low-value agarwood into high-performance, multifunctional, and low-cost composite filler materials is urgently needed by the industry and has significant social value. Summary of the Invention

[0006] Therefore, the purpose of this invention is to provide a composite filler particle for the recycling and regeneration of agarwood and a method for its preparation, so as to solve the problems in the background art.

[0007] To achieve the above objectives, the present invention mainly adopts the following technical solutions:

[0008] A composite filler particle made from recycled agarwood and white wood includes a core and a coating covering the outside of the core. The core is composed of a matrix material containing agarwood processing waste. The coating contains agarwood essential oil, sleep-aiding aromatic plant essential oil, negative oxygen ion powder, and silver ion powder.

[0009] Furthermore, the core is made by granulating agarwood powder after essential oil extraction with natural binders.

[0010] Furthermore, the particle size of the agarwood powder is 80-100 mesh; the natural binder is elm bark adhesive powder; and the mass ratio of the agarwood powder to the natural binder is 10:1.5 to 10:2.5.

[0011] Furthermore, based on the total mass of the coating, it comprises: 65-75% agarwood essential oil, 15-25% sleep-aiding aromatic plant essential oils, 7-9% negative oxygen ion powder, and 1-3% silver ion powder.

[0012] Furthermore, the sleep-aiding aromatic plant essential oil is selected from at least one of lavender essential oil, sandalwood essential oil, and ylang-ylang essential oil.

[0013] Furthermore, the kernel has a particle size of 3-5 mm and a water content of less than 5%.

[0014] A method for preparing recycled agarwood composite filler particles, comprising the following steps:

[0015] S1. Raw material sorting: Sorting agarwood waste into large pieces and small pieces;

[0016] S2. Preparation of agarwood beads: The large pieces of waste material that have been sorted out are processed into agarwood beads.

[0017] S3. Making coarse powder: Crush the sorted small pieces of waste material to obtain coarse powder;

[0018] S4. Essential oil extraction: Extract agarwood essential oil from the coarse powder obtained in step S3 and collect the extracted agarwood residue.

[0019] S5. Preparation of fine powder: The agarwood residue obtained in step S4 is processed into fine powder;

[0020] S6. Mixing process: The fine powder is uniformly mixed with the natural binder to form a mixed powder;

[0021] S7. Preparation of the core: The mixed powder is granulated to obtain a granular core;

[0022] S8. Preparation of coating liquid: Mix the agarwood essential oil extracted in step S4 with sleep-aiding aromatic plant essential oil, negative oxygen ion powder and silver ion powder evenly to make a coating liquid.

[0023] S9. Coating: The coating liquid is coated onto the surface of the granular core, and after curing, the composite filler particles are obtained; at the same time, the same or different coating liquids are coated onto the surface of the agarwood beads to obtain aromatic white wood beads.

[0024] Further, in step S8, agarwood essential oil is uniformly mixed with agarwood raw powder that has not been extracted to obtain functional powder; an adhesive is sprayed onto the surface of the base particles, and when it reaches a semi-dry, viscous state, the functional powder is evenly sprinkled on it and polished to form the coating.

[0025] Furthermore, the coating liquid contains the following components: plant-derived gum, highly active negative oxygen ion powder, deionized water, agarwood essential oil, sleep-aiding plant extracts, and nano silver ion powder; the plant-derived gum is one of modified plant starch gum, modified plant polysaccharide gum, or a natural gum compound.

[0026] Further, in step S4, the coarse powder is placed in a distillation apparatus, and pressurized boiling water is introduced for soaking, followed by depressurization and steam distillation.

[0027] Furthermore, in step S3, the cutting debris generated in step S2 is crushed together with small pieces of waste to obtain coarse powder.

[0028] Furthermore, in step S5, the agarwood residue is dried to a moisture content of less than 10% and then ground into a fine powder of 80-100 mesh.

[0029] In summary, this invention utilizes a full-component resource utilization process to transform agarwood waste into high-performance composite filler particles and aromatic agarwood beads. The core of this process lies in employing a pre-extraction and standardization process followed by granulation, which solves the product consistency problem caused by uneven oil content in the raw materials. The resulting products possess three functions: aromatic sleep aid, negative ion release, and antibacterial properties, with long-lasting and stable performance. This invention achieves the transformation of waste into treasure, combining significant cost advantages, environmental benefits, and market potential. Attached Figure Description

[0030] Figure 1 This is one of the structural schematic diagrams of a composite filler particle made from recycled agarwood and white wood according to the first embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of another embodiment of the composite filler particles made from recycled agarwood and white wood, processed according to the first embodiment of the present invention.

[0032] Figure 3This is one of the structural schematic diagrams of a distillation oil extraction device. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0034] Example 1

[0035] This embodiment provides a method for preparing composite filler particles based on the recycling and regeneration of agarwood, wherein the structure of the composite filler particles is as follows: Figure 1 As shown, the composite filling particles can be used as fillings for home furnishings such as pillows, mattresses, cushions, and backrests to provide support and emit fragrance. In other embodiments, they can also be used in fields such as aromatherapy and air purification. The composite filling particles include a core 10 and a coating 20 surrounding the core 10. The method specifically includes the following steps:

[0036] S1. Raw Material Sorting: Recycled agarwood scraps are sorted according to size and impurity content, removing moldy, insect-damaged, and non-agarwood impurities, and further categorized into large and small pieces based on their physical form. It should be noted that the recycled agarwood used in this invention originates from artificial cultivation, not wild sources.

[0037] S2. Preparation of agarwood beads: The large pieces of waste material that have been sorted out are prepared into agarwood beads of a specified size (e.g., 5mm in diameter) for later use.

[0038] Specifically, the large pieces of waste material are first cut into square strips with a cross-section of 6mm × 6mm using cutting equipment (such as a band saw). These square strips are then processed into cylindrical white wood rods using a rod-making machine. Finally, the white wood rods are polished using polishing equipment (such as a water grinder) to obtain agarwood beads with a diameter of approximately 5mm, which are then ready for use. All debris and dust generated during the cutting, rod-making, and polishing processes are collected.

[0039] S3. Preparation of coarse powder: The small pieces of waste material sorted out and the cutting debris generated in step S2 are washed to remove mud and sand impurities, then dried and crushed into coarse powder. In this embodiment, the moisture content of the dried material is about 10%, and the particle size range of the coarse powder is 20-40 mesh.

[0040] S4. Essential Oil Extraction: Extract agarwood essential oil from the coarse powder obtained in step S3 and collect the extracted agarwood residue. Specifically, the following method is used: Figure 3The distillation apparatus shown implements a process combining pressurized hot water pretreatment with atmospheric distillation. The apparatus includes a distillation kettle 41, a storage tank 42, a horizontal condenser 43, a vertical condenser 44, an oil-water separator 45, and a storage bottle 46. The storage tank 42 is connected to the distillation kettle 41. The distillation kettle 41, the horizontal condenser 43, the vertical condenser 44, the oil-water separator 45, and the storage bottle 46 are sequentially connected by pipelines, with valves installed between adjacent pipelines for opening and closing as needed. Furthermore, a high-pressure pump is installed between the storage tank 42 and the distillation kettle 41, which forces boiling water from the storage tank 42 into the distillation kettle 41. Additionally, a pressure transmitter is installed inside the distillation kettle 41 to monitor the pressure within the kettle in real time.

[0041] During operation, the coarse powder is placed in the distillation vessel 41 of the distillation apparatus. Boiling water is pumped into the vessel using a high-pressure pump, maintaining the pressure at a set level of 0.2-0.5 MPa (e.g., 0.4 MPa) for a set time of 15-30 minutes (e.g., 30 minutes) to achieve pressurized hot water soaking. The pressure is then released to atmospheric pressure for atmospheric pressure steam distillation. The steam is condensed by the condenser (43, 44) and separated by the oil-water separator 45, and the agarwood essential oil is collected in the storage bottle 46 for later use.

[0042] This process utilizes the physical permeation of pressurized hot water to more fully extract residual essential oil components from agarwood, thereby increasing the essential oil yield. More importantly, this step standardizes the uncontrollable and uneven essential oil content in the raw materials, ensuring that the agarwood residue substrate used for granulation maintains consistency in density, hardness, and water absorption. This fundamentally solves the technical problem of poor product consistency caused by raw material differences, while also enabling the recovery of high-value byproducts.

[0043] S5. Preparation of fine powder: After drying the agarwood residue obtained in step S4 (moisture content less than 10%), grind it into fine powder of 80-100 mesh.

[0044] S6. Mixing process: The fine powder is mixed with a natural binder (such as elm bark binder powder) at a mass ratio of 10:1.5 to 10:2.5, preferably 10:2, and the mixture is stirred evenly by a mixer to obtain a mixed powder.

[0045] S7. Preparation of basic particles (core 10): The mixed powder is granulated, sieved and dried to obtain basic filler particles with a particle size of 3-5mm and a moisture content of less than 5%, which is the core 10 of the composite filler particles.

[0046] Specifically, a disc granulator is used, with the disc tilt angle controlled at 45° and the rotation speed at 60 r / min. Water, accounting for 12%-18% of the total powder mass, is sprayed to agglomerate the powder into spheres. After polishing in a disc granulator, qualified granules of 3-5 mm are sieved out and dried at 80℃ for 6 hours or naturally sun-dried until the moisture content is <5%. This step yields a dense core 10 with suitable strength and stable water absorption, providing a foundation for the firm adhesion of subsequent functional coatings.

[0047] S8. Preparation of Coating Liquid: The coating liquid is applied to the outer surface of the base particles processed in step S7 to form the coating 20. The agarwood essential oil extracted in step S4 is mixed evenly with sleep-aiding aromatic plant essential oils, negative ion powder, and silver ion powder in a predetermined ratio to prepare the coating liquid. In this embodiment, the coating liquid comprises the following components by mass ratio: 70% agarwood essential oil, 20% lavender essential oil, 8% negative ion powder, and 2% silver ion powder.

[0048] Preparation of S9 and Coating 20:

[0049] S9a. Preparation of the filler particle coating: The composite functional coating liquid is uniformly coated onto the surface of the base filler particles obtained in step S7 to form an aromatic functional outer coating. After curing, composite filler particles are obtained. In this embodiment, the coating liquid is sprayed onto the surface of the base particles and dried at a low temperature of 40°C to obtain composite filler particles. The negative oxygen ion release is measured to be 1800 ions / cm³.

[0050] S9b, Preparation of aromatic white wood bead coating: The same proportion of the composite functional coating liquid is uniformly coated on the surface of the agarwood white wood beads obtained in step S2 to form an aromatic functional outer layer, and aromatic white wood beads are obtained after curing.

[0051] Furthermore, during coating preparation, the core 10 can be placed in a roller spraying device, and the coating liquid can be sprayed onto the outer surface of the core 10. Preferably, a two-coating process can be used, with the second coating applied after the first coating has dried. After spraying and drying, the particles are placed in an environment of 25°C and 50% relative humidity for 12 hours to balance the internal moisture and coating components, obtaining the final product. Alternatively, the final product can be obtained directly by drying.

[0052] Example 2

[0053] This embodiment is basically the same as Embodiment 1, except that in step S6 the mass ratio of fine powder to elm bark adhesive powder is 10:1.5, in step S8 the composite coating liquid is composed of 75% agarwood essential oil, 15% sandalwood essential oil, 7% negative oxygen ion powder, and 3% silver ion powder, and after coating in step S9 the finished product releases 1600 negative oxygen ions / cm³, the remaining steps and parameters are the same as in Embodiment 1.

[0054] Example 3

[0055] This embodiment is basically the same as Embodiment 1, except that in step S6 the mass ratio of fine powder to elm bark adhesive powder is 10:2.5, in step S8 the composite coating liquid is formulated with 65% agarwood essential oil, 25% ylang-ylang essential oil, 9% negative oxygen ion powder, and 1% silver ion powder, and after coating in step S9 the finished product releases 2000 negative oxygen ions / cm³, the remaining steps and parameters are the same as in Embodiment 1.

[0056] The above embodiments demonstrate that by adjusting the proportion of the binder in the core 10 (e.g., 10:1.5 to 10:2.5), the hardness and formability of the particles can be controlled to adapt to different application requirements. Simultaneously, by adjusting the ratio of each functional component in the composite coating liquid, the aroma type, negative ion release intensity, and antibacterial performance of the final product can be specifically adjusted, thereby obtaining a series of customizable products to meet diverse market demands.

[0057] Example 4

[0058] This embodiment is basically the same as the first embodiment, and is also carried out on the basis of steps S1 to S7 (preparation of basic particle core) in embodiment one. Its core is to construct a high-performance composite coating on the surface of the core 10 through a carefully designed coating liquid, which integrates the functions of adhesion, fragrance, negative ion release, antibacterial and sleep aid.

[0059] S8', Coating Liquid Preparation: The coating liquid is used to coat the outer surface of the base particles (core 10) processed in step S7 to form a functional coating 20. The coating liquid includes the following components: plant-derived gum, agarwood essential oil, highly active negative oxygen ion powder, deionized water, composite additives, sleep-aiding compound, and nano silver ion powder. The plant-derived gum can be selected from modified plant starch gum, modified plant polysaccharide gum, or a natural resin compound. The agarwood essential oil is preferably Qinan agarwood essential oil extracted in step S4; the nano silver ion powder provides antibacterial and antifungal functions.

[0060] The typical formulation (parts by weight) of the coating liquid is as follows: Modified plant starch gum: High-activity negative oxygen ion powder: Deionized water: Composite additives: Agarwood essential oil: Sleep-aiding compound: Silver ion powder = 100: 12: 34.5: 2.5: 0.1: 0.8: 0.5. At a suitable temperature (room temperature to 55℃), first mix the plant-derived gum with deionized water to form a uniform solution. Then add the negative oxygen ion powder and silver ion powder, stirring at high speed to ensure full dispersion. Finally, cool to approximately 35℃, then add the sleep-aiding compound and agarwood essential oil sequentially, stirring gently until combined. After standing to defoam, the coating is ready.

[0061] The sleep-aid compound is a compound of natural plant extracts, such as two or more extracts of lavender, chamomile, jujube seed, valerian, poria cocos, and albizia bark, mixed in different proportions to achieve specific effects such as soothing nerves and promoting sleep.

[0062] S9' Place the core 10 obtained in step S7 into a roller spraying device and perform a two-coating process. The first coating is applied to a portion of the coating liquid (e.g., 60% of the total amount), and pre-baked at 38-45℃. The second coating is applied to the remaining coating liquid, and dried and cured within the same temperature range. After spraying, the particles are placed in a constant temperature and humidity environment (e.g., 25℃, 50%RH) for aging and equilibrium to obtain the final product.

[0063] This embodiment utilizes a carefully designed composite coating liquid to impart multiple functions to the filler particles in a single application, including long-lasting fragrance, negative ion release, antibacterial and antifungal properties, and sleep-aiding and calming effects. The composition and process of the coating liquid are adjustable to meet different performance requirements and product positioning.

[0064] Example 5

[0065] like Figure 2 As shown, the composite filler particles prepared by the method in this embodiment differ from those in the first embodiment in that the composite filler particles in this embodiment have a three-layer structure, comprising: a core 10 made of agarwood residue substrate, an adhesive layer 30 composed of environmentally friendly adhesive, and an encapsulation layer 40 composed of a mixture of agarwood essential oil and agarwood powder. This embodiment employs a solid-state encapsulation modification process, by pre-blending agarwood essential oil with high-quality agarwood powder in a gradient manner, and then using an environmentally friendly adhesive as a medium to sequentially form the adhesive layer 30 and the functional encapsulation layer 40 on the surface of the core 10, thereby obtaining composite particles with a more uniform, lasting, and controllable aroma.

[0066] This method is based on steps S1 to S7 (preparation of basic particle cores) in Example 1, and is carried out according to the following steps:

[0067] S8'', Preparation of the coating layer raw material (essential oil and agarwood powder blend): Based on the requirement that the final coating layer material amount is 3% of the total particle mass, take the agarwood essential oil extracted in step S4 and blend it with high-quality Qinan agarwood powder (this powder is made directly from Qinan agarwood raw material rich in essential oil, without undergoing essential oil extraction). Use a multi-step gradient mixing method. Specific steps are as follows:

[0068] (1) First step of fusion: Mix agarwood essential oil and agarwood powder in a mass ratio of 1:10 (for example, 1 gram of essential oil is mixed with 10 grams of agarwood powder), knead and mix by hand for 10 minutes to obtain the preliminary fusion material;

[0069] (2) Second step of fusion: According to the mass ratio of the initial fusion material to the newly added Qinan agarwood powder of 1:10, after sieving the first step fusion material, it is evenly sieved into the newly added Qinan agarwood powder. While sieving, knead and mix for 20 minutes to obtain the second fusion material.

[0070] (3) Gradient Iterative Fusion: Repeat the operation of step 2, each time using a mass ratio of 1:10 between the current fused material and the newly added Qinan agarwood powder. After sieving, knead and mix for 20 minutes until the total mass of the fused material reaches 3% of the total mass of the particles, thus obtaining the raw material for the coating layer 40. This method effectively avoids the problems of essential oil agglomeration and uneven aroma distribution caused by one-time mixing.

[0071] In another embodiment, a small amount (e.g., 1-2% of the total powder mass) of silver ion powder may be added to the final fusion material to give the coating layer 40 additional antibacterial, antifungal, and moisture-proof functions.

[0072] S9'', Construct adhesive layer 30 and encapsulation layer 40 sequentially:

[0073] (1) Forming the adhesive layer 30: The base particles (i.e., the core 10) prepared and dried in step S7 are placed into a rotary granulator. An environmentally friendly polymer adhesive or a natural plant adhesive (i.e., the raw material for the adhesive layer 30) is uniformly sprayed onto the surface of the rotating particles using a high-pressure sprayer. Specifically, the polymer adhesive is preferably polyurethane (PU) glue or silicone glue, and the natural plant adhesive is preferably a plant-derived adhesive material. The amount of glue sprayed is controlled to be about 5% of the total mass of the particles. After spraying, the particles continue to rotate, so that the glue forms a uniform adhesive film on the surface of the core 10.

[0074] (2) Constructing the encapsulation layer 40: When the adhesive is in a semi-dry, viscous state (i.e., the adhesive layer 30 is initially formed but not completely cured), the essential oil-agarwood powder fusion material prepared in step S8' is evenly sprinkled in. Continue to rotate and polish for 10-15 minutes. Under the action of mechanical force, the fusion material is firmly and evenly encapsulated by the adhesive layer 30, thereby forming a dense functional encapsulation layer 40 outside the core 10.

[0075] This embodiment employs a clearly defined three-layer structure: a core (support), an adhesive layer (fixing medium), and a coating layer (functional element). This structure ensures clear functionality for each layer and strong process controllability. The coating layer raw material, prepared using a gradient mixing method, fundamentally solves the problem of uneven essential oil distribution. The solid powder form of the coating layer allows for a slower and more stable release of aroma, resulting in a longer lifespan. Adhesion via a semi-dry, viscous adhesive layer ensures a stronger bond between the coating layer and the core, preventing powdering and detachment during subsequent filling and use.

[0076] In summary, the advantages of this invention compared to the prior art are as follows:

[0077] 1. Achieving efficient resource utilization and significantly reducing costs: By classifying and processing agarwood waste according to its form, large pieces are made into agarwood beads, while small pieces and debris are used to extract essential oils. The agarwood residue is then used to make the core of granules, and the extracted essential oils are directly used in functional coatings, forming a complete internal resource cycle. This not only achieves comprehensive high-value utilization of waste materials but also significantly reduces production costs due to the low cost of raw materials and the elimination of the need to purchase essential oils from external sources.

[0078] 2. Multifunctional Integration, Long-Lasting and Stable Performance: The composite functional coating built on the particle surface integrates self-extracted agarwood essential oil, sleep-aiding plant extracts, negative ion powder, and antibacterial silver ion powder, giving the product a triple effect of aromatherapy for sleep, release of negative ions, and antibacterial and anti-mildew properties. The coating is firmly bonded to the core, ensuring a long-lasting and stable release of aroma and function, overcoming the shortcomings of traditional products such as easy deliquescence and single function.

[0079] 3. High process controllability, safety and environmental protection: A complete process chain has been established from raw material sorting to surface coating, with clear parameters and tight connections between links, ensuring product consistency and the feasibility of large-scale production. The entire process mainly uses physical processing and natural ingredients, with no harmful additives, and meets green product standards.

[0080] 4. Highly practical and ecologically beneficial: The resulting granules and white wood beads can be used as filling materials for pillows and other products, improving the sleep environment through multiple functions. This project transforms waste into high-value-added health products, possessing both market potential and ecological benefits.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite filler particle made from recycled agarwood and white wood, characterized in that: It includes a core and a coating that surrounds the core. The core is composed of a matrix material containing waste from the processing of agarwood. The coating contains agarwood essential oil, negative ion powder, and silver ion powder.

2. The agarwood and white wood recycled composite filler particles as described in claim 1, characterized in that: The core is made by mixing and granulating agarwood powder after essential oil extraction with natural binders.

3. The agarwood and white wood recycled composite filler particles as described in claim 2, characterized in that: The agarwood powder has a particle size of 80-100 mesh; the natural binder is elm bark adhesive powder; the mass ratio of the agarwood powder to the natural binder is 10:1.5 to 10:2.

5.

4. The agarwood and white wood recycled composite filler particles as described in claim 1, characterized in that: Based on the total mass of the coating, it contains: 65-75% agarwood essential oil, 15-25% sleep-aiding aromatic plant essential oils, 7-9% negative oxygen ion powder, and 1-3% silver ion powder.

5. A method for preparing agarwood and white wood recycled composite filler particles, used to prepare the agarwood and white wood recycled composite filler particles as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Raw material sorting: Sorting agarwood waste into large pieces and small pieces; S2. Preparation of agarwood beads: The large pieces of waste material that have been sorted out are processed into agarwood beads. S3. Making coarse powder: Crush the sorted small pieces of waste material to obtain coarse powder; S4. Essential oil extraction: Extract agarwood essential oil from the coarse powder obtained in step S3 and collect the extracted agarwood residue. S5. Preparation of fine powder: The agarwood residue obtained in step S4 is processed into fine powder; S6. Mixing process: The fine powder is uniformly mixed with the natural binder to form a mixed powder; S7. Preparation of the core: The mixed powder is granulated to obtain a granular core; S8. Preparation of coating liquid: Mix the agarwood essential oil extracted in step S4 with negative oxygen ion powder and silver ion powder evenly to prepare a coating liquid. S9. Coating: The coating liquid is coated onto the surface of the granular core, and after curing, the composite filler particles are obtained; at the same time, the same or different coating liquids are coated onto the surface of the agarwood beads to obtain aromatic white wood beads.

6. The preparation method of agarwood and white wood recycled composite filler particles as described in claim 5, characterized in that: In step S8, agarwood essential oil is uniformly mixed with agarwood raw powder that has not been extracted to obtain functional powder; an adhesive is sprayed onto the surface of the base particles, and when it reaches a semi-dry, viscous state, the functional powder is evenly sprinkled on it and polished to form the coating.

7. The preparation method of agarwood and white wood recycled composite filler particles as described in claim 5, characterized in that: The coating liquid contains the following components: plant-derived gum, highly active negative oxygen ion powder, deionized water, agarwood essential oil, sleep-aiding plant extracts, and nano silver ion powder; the plant-derived gum is one of modified plant starch gum, modified plant polysaccharide gum, or a natural gum compound.

8. The preparation method of agarwood and white wood recycled composite filler particles as described in claim 5, characterized in that: In step S4, the coarse powder is placed in a distillation apparatus, and pressurized boiling water is introduced for soaking. Then the pressure is released and steam distillation is carried out.

9. The preparation method of agarwood and white wood recycled composite filler particles as described in claim 5, characterized in that: In step S3, the cutting debris generated in step S2 is crushed together with small pieces of waste to obtain coarse powder.

10. The method for preparing agarwood and white wood recycled composite filler particles as described in claim 5, characterized in that: In step S5, the agarwood residue is dried to a moisture content of less than 10% and then ground into a fine powder of 80-100 mesh.

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