Environment-friendly multifunctional coconut-fragrance microcapsule for artificial board and preparation method of environment-friendly multifunctional coconut-fragrance microcapsule

Abstract

The invention belongs to the technical field of artificial board additives and microcapsules, and discloses an environment-friendly multifunctional coconut-flavored microcapsule for artificial boards and a preparation method thereof.Natural high polymer materials such as chitosan, gelatin and Arabic gum serve as wall materials of the microcapsule, natural coconut essence and quaternary ammonium salt antibacterial and mildew-proof agents serve as core materials of the microcapsule, and the microcapsule is prepared by mixing the wall materials, the core materials and the coconut essence and the quaternary ammonium salt antibacterial and mildew-proof agents. The coating is prepared through a complex coacervation method or an interfacial polymerization method in combination with a secondary coating process. The essence microcapsule solves the problems of single function, poor fragrance durability, insufficient heat resistance and pressure resistance, poor wall material environmental protection property and the like of the essence microcapsule for the artificial board in the prior art; the microcapsule prepared by the invention is controllable in particle size, has good heat resistance and pressure resistance, and meets the requirements of an artificial board production process; when the microcapsule is added into the artificial board, the artificial board can be endowed with lasting coconut fragrance and excellent antibacterial and mildew-proof performance, and the wall material adopts a natural environment-friendly material, so that the product additional value and the market competitiveness of the artificial board are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of microcapsules, and in particular to a functional additive for artificial boards, in particular to a multifunctional microcapsule having the functions of releasing natural coconut fragrance, antibacterial and mildew-proofing, and good heat and pressure resistance and environmental protection, and a preparation method thereof. Background Art

[0002] Artificial panels, such as particleboard, fiberboard, and plywood, are widely used in furniture manufacturing, interior decoration, and other fields. With the improvement of people's quality of life and the pursuit of healthy and environmentally friendly home environments, the functional requirements for artificial panels are also increasing. Among them, imparting artificial panels with long-lasting fragrance, antibacterial properties, and mildew resistance has become an important means of enhancing product added value and market competitiveness.

[0003] Currently, it is common practice to add fragrance to artificial boards to give them a scent. However, the traditional method is usually to add liquid fragrance directly to the adhesive or board raw materials. This method has significant drawbacks: First, the production process of artificial boards usually involves high temperature and high pressure. The hot pressing temperature can reach 180-220℃, and the pressure can reach 2-5MPa or even higher. Liquid fragrance is extremely easy to volatilize, lose, and decompose and deteriorate under such conditions, resulting in extremely low effective utilization rate of the fragrance. The loss rate may be as high as over 95%, and the fragrance release effect is poor and not long-lasting. Second, directly added fragrance may react adversely with adhesives or other components, affecting the performance of the board.

[0004] Microencapsulation technology was introduced to address the issues of fragrance loss and short-lasting properties. By encapsulating fragrance within tiny capsules, microcapsules effectively protect the fragrance and enable sustained or controlled release. While some fragrance microcapsules are already used in the cosmetics and textile industries, their application in wood-based panel production presents new challenges:

[0005] 1. Existing technologies have problems with insufficient heat and pressure resistance: Most traditional microcapsules, such as gelatin-gum arabic complex microcapsules used in food and daily chemicals or simple interfacial polymerization microcapsules, are unable to withstand the high temperature and high pressure required for the production of artificial boards. As a result, a large number of microcapsules rupture during the hot pressing process, resulting in the loss of instantaneous release of flavors and the inability to achieve long-term sustained release.

[0006] 2. Existing technologies have environmental issues with wall materials: Some microcapsules developed to improve durability use urea-formaldehyde resins, melamine-formaldehyde resins, and other materials as wall materials. While these materials offer excellent mechanical strength and stability, they may contain residual unreacted formaldehyde or release formaldehyde over time. This, combined with the formaldehyde emissions inherent in wood-based panels, does not meet the environmentally friendly demands of modern homes.

[0007] 3. The existing technology has the problem of single function: the existing functional microcapsules used for artificial boards usually have only a single function, such as only providing fragrance, or only providing antibacterial / mildew resistance. If multiple functions are to be achieved at the same time, it is necessary to add a variety of different microcapsules or additives, which increases the complexity and cost of the process. For example, patent CN112941968A discloses a fragrance-releasing decorative artificial board and its preparation method, but it only focuses on the fragrance-releasing function and does not mention the antibacterial and mildew-proof and environmental protection issues of the wall material. Some antibacterial and mildew-proof agents, such as preparations containing heavy metal ions Ag+ and Cu+, also have the risk of precipitation and environmental problems when directly added.

[0008] Therefore, there is an urgent need to develop a new type of microcapsule technology that can simultaneously meet the high temperature and high pressure resistance requirements of the artificial board production process and the environmental protection requirements of the home environment, and integrate multiple functions such as long-lasting fragrance release, antibacterial and mildew resistance into one, so as to simplify the production process and improve the comprehensive performance and market value of artificial boards. Summary of the Invention

[0009] In response to the shortcomings of the above-mentioned technology, the present invention aims to overcome the problems of poor heat and pressure resistance, environmentally unfriendly wall materials, single function, and insufficient fragrance persistence of the flavor microcapsules used for artificial boards in the prior art, and provide an environmentally friendly, multifunctional, stable performance coconut flavor microcapsule suitable for the artificial board production process and a preparation method thereof.

[0010] To achieve the above-mentioned object, the present invention provides an environmentally friendly multifunctional coconut-scented microcapsule for artificial boards. The microcapsule comprises a core material and a wall material coating the core material. The core material comprises natural coconut essence and at least one quaternary ammonium salt antibacterial and mildew-proof agent. The natural coconut essence provides a pleasant fragrance and may also contain ingredients with certain biological activity such as limonene. Quaternary ammonium salt antibacterial and mildew-proof agents (such as benzalkonium chloride, cetrimonium bromide, etc.) have broad-spectrum and high-efficiency antibacterial and mildew-proof activity and are safer than heavy metal antibacterial agents. The wall material comprises at least two natural polymer materials selected from chitosan, gelatin, gum arabic, sodium alginate, and modified starch. These materials are widely available, have good biocompatibility, are biodegradable, environmentally friendly and non-toxic. By selecting a suitable material combination and preparation process, a dense, tough wall shell with good thermal stability and mechanical strength can be formed.

[0011] Furthermore, the wall material has a double-layer structure. For example, the inner wall material can be formed from gelatin and gum arabic through a complex coacervation process, while the outer wall material can be formed from chitosan by deposition and coating with a modified pH value or the addition of a crosslinking agent. This double-layer wall structure significantly improves the microcapsule's compactness, mechanical strength, and resistance to environmental stresses (such as high temperature, high pressure, and shear forces), further reducing leakage and loss of the core material.

[0012] Furthermore, the weight ratio of the wall material is optimized, for example: 1-5 parts chitosan, 2-8 parts gelatin, and 2-8 parts gum arabic. Such a ratio helps to form a stable wall material structure with excellent performance.

[0013] The weight percentage of natural coconut essence in the core material is preferably 50%-90% to ensure sufficient fragrance intensity and persistence. The quaternary ammonium salt antibacterial and mildew-proof agent is selected to take into account both high efficiency and safety.

[0014] The microcapsules of the present invention possess specific physical properties, with an average particle size preferably controlled between 50 and 100 microns. This facilitates uniform mixing with wood fibers or shavings and adhesives during the wood-based panel manufacturing process. More importantly, the microcapsules exhibit excellent heat and pressure resistance, capable of withstanding temperatures of at least 200°C for at least 5 minutes and pressures of at least 5 MPa. This ensures structural integrity during the hot-pressing process of the wood-based panel, effectively protecting the core material.

[0015] The present invention also provides a method for preparing the above-mentioned microcapsules. The method generally adopts a complex coacervation method, an interfacial polymerization method, or a combination thereof, and may include a secondary coating and a curing and cross-linking step. Specifically, it includes:

[0016] Step S1, core material preparation: natural coconut essence is mixed with liquid or dissolved quaternary ammonium salt antibacterial agent, and a small amount of oil-soluble emulsifier (such as Span series surfactant) can be added to improve subsequent emulsification stability.

[0017] Step S2, preparation of wall material solution: dissolving selected natural polymer materials (such as gelatin, gum arabic, chitosan, etc.) in suitable aqueous solvents (such as water, dilute acid solution), and adjusting to appropriate concentration and temperature.

[0018] Step S3, emulsification: adding the oil phase core material solution to a wall material solution (e.g., gelatin solution), and emulsifying under high shear (e.g., using a high-speed homogenizer with a rotation speed of 5000-15000 rpm) and a suitable temperature (e.g., 40-50°C, higher than the gel point of gelatin) to form an O / W emulsion with uniform particle size.

[0019] Step S4, encapsulation (taking the complex coacervation method as an example): add another wall material solution (such as a gum arabic solution) to the above emulsion, and accurately adjust the pH value of the system (for example, to 4.0-4.5 with acetic acid or citric acid) and / or the temperature (for example, slowly cool to 10-20°C) to cause the oppositely charged gelatin and gum arabic to coagulate and deposit on the surface of the oil droplets to form the primary microcapsule wall.

[0020] Step S5, secondary coating: Chitosan solution can be added to the primary microcapsule suspension, and the pH can be adjusted to the chitosan deposition condition (such as pH 5.5-6.5), or secondary coating can be performed by other means (such as layer-by-layer self-assembly) to form a stronger double-layer wall.

[0021] Step S6, curing and crosslinking: An appropriate amount of a chemical crosslinking agent (e.g., glutaraldehyde, 0.1%-2.0%) or a biological crosslinking agent (e.g., tannic acid, recombinant enzyme) is added to the microcapsule wall material under specific conditions (e.g., temperature and time) to crosslink the wall material, thereby improving its mechanical strength, chemical stability, and thermal stability. While glutaraldehyde crosslinking is effective, residual effects should be considered. Less toxic or natural crosslinking agents can be used.

[0022] Step S7, Post-Processing: The cross-linked and cured microcapsule suspension is collected by centrifugation or filtration, washed several times with distilled water and / or ethanol to remove any remaining unreacted products, surfactants, and cross-linking agents, and finally spray-dried or freeze-dried to obtain a microcapsule powder with good fluidity. Spray-drying conditions (inlet and outlet air temperatures, and feed flow rate) must be optimized to ensure that the microcapsule structure is not destroyed.

[0023] Compared with the prior art, the present invention has the following significant advantages and beneficial effects:

[0024] 1. The present invention integrates the three functions of long-lasting fragrance release, high-efficiency antibacterial and mildew-proof into a single microcapsule, which simplifies the process of functional treatment of artificial boards, reduces production costs, and has the advantage of multifunctional integration.

[0025] 2. The wall materials of the present invention are made of natural polymer materials such as chitosan, gelatin, and gum arabic, which have good biocompatibility and are biodegradable, avoiding the formaldehyde pollution problem caused by the use of urea-formaldehyde resins, etc., and meet the requirements of green home furnishing. The core materials are made of natural flavors and quaternary ammonium salt antibacterial agents with higher safety, which reduces health risks and has the advantages of environmental protection and safety.

[0026] 3. The present invention significantly improves the high temperature and high pressure resistance of the microcapsules by optimizing the wall material composition and strengthening the cross-linking and curing process, enabling them to adapt to the harsh conditions of hot pressing production of artificial boards, greatly reducing the loss rate of the core material during the processing, and having excellent heat and pressure resistance.

[0027] 4. The sustained-release structure of the microcapsules of the present invention effectively prolongs the release time of the coconut aroma, which can last for more than one year, much longer than the duration of direct addition, and can ensure continuous antibacterial and mildew-proof effects, with the advantage of long-lasting effect.

[0028] 5. The present invention gives the artificial board a unique natural fragrance and health protection function, improves the grade and market competitiveness of the product, meets the consumer's demand for high-quality, healthy and environmentally friendly household products, and can significantly enhance the value of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0030] Figure 1 This is a schematic diagram of the cross-sectional structure of an environmentally friendly multifunctional coconut-flavored microcapsule of the present invention.

[0031] Figure 2 The present invention is a process flow chart of a preferred method for preparing environmentally friendly multifunctional coconut-flavored microcapsules. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0033] Example 1: Preparation of gelatin / gum arabic-chitosan double-wall microcapsules

[0034] Step S1, core material preparation: 80 g of natural coconut essential oil was added with 15 g of benzalkonium chloride (as an antibacterial and mildew-proof agent) and 5 g of Span 80 (co-emulsifier), and the mixture was mixed uniformly to obtain an oil phase core material.

[0035] Step S2, preparation of wall material solution:

[0036] Solution A: Weigh 10 g of gelatin (Type A, 250 Bloom), dissolve it in 200 mL of deionized water, and heat to 50°C to completely dissolve it.

[0037] Solution B: Weigh 10 g of gum arabic and dissolve it in 200 mL of deionized water. Stir until dissolved.

[0038] Solution C: Weigh 3 g of chitosan (deacetylation degree ≥ 90%, medium viscosity), dissolve it in 150 mL of 1% (v / v) acetic acid solution, and stir to dissolve.

[0039] Step S3, emulsification: maintaining solution A at 50° C., adding the oil phase core material prepared in step 1, and emulsifying at 8000 rpm for 15 minutes using a high-speed shear emulsifier to form a uniform O / W emulsion.

[0040] Step S4, First Coating (Complex Coagulation): Solution B was slowly added to the above emulsion while stirring. A 10% citric acid solution was then slowly added dropwise to adjust the pH of the system to 4.0. While continuing to stir, the system temperature was slowly lowered to 15°C and maintained at this temperature for 1 hour to allow the gelatin and gum arabic to coagulate on the surface of the oil droplets to form an inner wall.

[0041] Step S5, second coating: Solution C was slowly added to the above suspension, and then the pH value was slowly adjusted to 6.0 with 1M NaOH solution. Stirring was continued at room temperature for 2 hours to allow chitosan to deposit on the surface of the primary microcapsules to form an outer wall.

[0042] Step S6, curing and cross-linking: slowly add 10 mL of 2.5% glutaraldehyde solution to the suspension (to make the final glutaraldehyde concentration about 0.25%), and stir the mixture at room temperature for 3 hours to cross-link and cure the double-layer wall material.

[0043] Step S7, post-treatment: The reaction suspension was centrifuged at 4000 rpm for 10 minutes, and the supernatant was discarded. The precipitate was washed three times with deionized water and once with anhydrous ethanol. The washed microcapsules were pre-frozen at -80°C and then freeze-dried to obtain a white to pale yellow microcapsule powder.

[0044] Performance testing:

[0045] 1) Particle size analysis: The average particle size of the microcapsules was measured by a laser particle size analyzer and was found to be 75.8 μm, with a narrow distribution.

[0046] 2) Morphology observation: Scanning electron microscopy (SEM) observation showed that the microcapsules were spherical with a relatively smooth and dense surface.

[0047] 3) Determination of embedding efficiency: The embedding efficiency of essential oil was determined by solvent extraction method and was about 88%.

[0048] 4) Heat resistance test: Take an appropriate amount of microcapsule powder and place it in an oven and heat it at 200°C for 10 minutes. SEM observation shows that most of the microcapsule structure remains intact and the aroma loss is minimal.

[0049] 5) Pressure resistance test: The microcapsule powder was pressed into a tablet and kept under a pressure of 5 MPa for 1 minute. Microscopic observation showed that most of the microcapsules were not broken.

[0050] Example 2: Preparation of gelatin / sodium alginate wall material microcapsules

[0051] Step S1, core material preparation: the same as Example 1, except that the quaternary ammonium antibacterial agent is changed to 10 g of cetrimonium bromide.

[0052] Step S2, preparation of wall material solution:

[0053] Solution A: 10 g gelatin dissolved in 200 mL water at 50°C.

[0054] Solution D: 5 g sodium alginate dissolved in 200 mL water.

[0055] Step S3, emulsification: add the oil phase core material into solution A and emulsify at 8000 rpm for 15 minutes.

[0056] Step S4, encapsulation: Solution D is added to the emulsion under stirring and mixed evenly. 2% CaCl2 solution is then slowly added dropwise to initiate crosslinking between sodium alginate and calcium ions. Simultaneously, the pH is adjusted to approximately 4.5 to promote gelatin coagulation and form a wall material.

[0057] Step S5, curing and cross-linking: adding 0.5% tannic acid solution for cross-linking treatment, and reacting at room temperature for 4 hours.

[0058] Step S6, post-processing: centrifugation, water washing, ethanol washing, and freeze drying.

[0059] Performance testing:

[0060] 1) Average particle size: 85.2 μm.

[0061] 2) Embedding rate: 85%.

[0062] 3) Heat resistance: Stable at 190°C.

[0063] 4) Pressure resistance: can withstand a pressure of about 4MPa.

[0064] Example 3: Application test of artificial board

[0065] The coconut-flavored antibacterial and mildew-proof microcapsule powder obtained in Example 1 is added to an impregnating resin glue (such as melamine formaldehyde resin or modified urea-formaldehyde resin glue) for preparing an impregnated film paper for artificial board facing according to 0.5% of the absolute dry weight of the facing paper base paper, and mixed uniformly. The impregnating resin glue containing microcapsules is applied to the facing paper base paper by an impregnation process, and the impregnated film paper containing microcapsules is obtained after drying. Then, the impregnated film paper containing microcapsules is combined with a blockboard substrate (or other type of artificial board substrate) according to a conventional impregnated film paper veneer production process, and hot pressing (hot pressing parameters are adjusted according to the resin glue type used and the base material, such as hot pressing temperature 160-190°C, unit pressure 1.5-2.5MPa, hot pressing time 30-90 seconds), cooling, trimming and other operations are performed to make an impregnated film paper veneer artificial board (such as a facing blockboard with a thickness of 18mm).

[0066] At the same time, a blank control veneer blockboard was prepared using impregnated film paper without adding microcapsules, and a control veneer blockboard was prepared using impregnated film paper prepared by directly adding equal amounts of (non-microencapsulated) coconut essence and benzalkonium chloride to the impregnating resin glue and hot-pressed using the same process.

[0067] Performance comparison:

[0068] 1. Odor evaluation:

[0069] Boards with added microcapsules: emit a clear and long-lasting coconut fragrance after opening the package. The fragrance is still obvious after 1 month, and a faint fragrance can still be smelled after 6 months.

[0070] Boards with directly added flavors: The aroma is strong but pungent when the package is opened. After 1 week, the aroma has been significantly weakened and almost disappears after 1 month.

[0071] Blank board: Only the smell of wood and adhesive.

[0072] 2. Antibacterial performance test (refer to LY / T 1926-2020 "Testing and Classification of Antibacterial Properties of Artificial Panels and Wood (Bamboo) Products"):

[0073] Boards with added microcapsules: The antibacterial rate against Staphylococcus aureus and Escherichia coli reaches more than 99%.

[0074] Boards with directly added antimicrobial agents: The antimicrobial rate is about 90% (part of the antimicrobial agent is lost or becomes ineffective during hot pressing).

[0075] Blank plate: no antibacterial effect.

[0076] 3. Anti-mildew performance test (refer to GB / T18261-2013, "Test method for the control of mildew and discoloration fungi on wood"):

[0077] Boards with added microcapsules: The anti-mildew level reaches level 0 (no mold growth under a microscope).

[0078] Boards with directly added antimicrobial agents: Mildew resistance level is 1 (a small amount of mold growth).

[0079] Blank board: mildew resistance level is 2-3 (moderate or severe mildew growth).

[0080] 4. Physical and mechanical properties: The static bending strength, internal bonding strength, water absorption thickness expansion rate and other indicators of the board with microcapsules added have no significant difference compared with the blank board, meeting the requirements of GB / T 34722-2017 "Impregnated film paper veneer plywood and blockboard" standard.

[0081] 5. Formaldehyde emission (refer to GB18580-2017, "Indoor Decoration and Renovation Materials - Formaldehyde Emission Limits in Artificial Boards and Their Products"):

[0082] The formaldehyde emission of the board with added microcapsules did not increase significantly compared with the blank board, and was much lower than that of the board with direct use of urea-formaldehyde resin wall material microcapsules.

[0083] Conclusion: The environmentally friendly, multifunctional coconut-flavored microcapsules provided by this invention use natural polymer wall materials to successfully encapsulate coconut flavor and a quaternary ammonium salt antimicrobial agent. Through optimized preparation processes (particularly double-layer walls and effective cross-linking), they achieve excellent heat and pressure resistance, making them suitable for the production conditions of artificial boards. Their application in artificial boards not only imparts a long-lasting, pleasant coconut fragrance and highly effective antibacterial and mildew-proof properties, but also maintains excellent environmental and physical and mechanical properties, significantly enhancing the added value of the boards.

[0084] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these specific embodiments are merely illustrative, and that those skilled in the art may omit, substitute, and modify the details of the methods and systems described above without departing from the principles and spirit of the present invention. For example, combining the above method steps to perform substantially the same functions in substantially the same manner to achieve substantially the same results falls within the scope of the present invention. Accordingly, the scope of the present invention is limited solely by the appended claims.

Claims

1. An environmentally friendly multifunctional coconut-scented microcapsule for artificial boards, characterized in that: The microcapsule comprises a core material and a wall material covering the core material; the core material comprises natural coconut essence and at least one quaternary ammonium salt antibacterial and mildew-proof agent; the wall material comprises at least two natural polymer materials selected from chitosan, gelatin, gum arabic, sodium alginate, and modified starch.

2. The environmentally friendly multifunctional coconut-scented microcapsule for artificial boards according to claim 1, characterized in that: The wall material is a double-layer structure, and the inner layer wall material and the outer layer wall material are composed of different or partially identical natural polymer materials.

3. The environmentally friendly multifunctional coconut-scented microcapsule for artificial boards according to claim 1, characterized in that: The weight ratio of the wall materials is: 1-5 parts of chitosan, 2-8 parts of gelatin, and 2-8 parts of gum arabic.

4. The environmentally friendly multifunctional coconut-scented microcapsule for artificial boards according to claim 1, characterized in that: The weight percentage of the natural coconut essence in the heartwood is 50%-90%.

5. The environmentally friendly multifunctional coconut-scented microcapsule for artificial boards according to claim 1, characterized in that: The quaternary ammonium salt antibacterial and mildew-proof agent is selected from at least one of benzalkonium chloride, cetrimide bromide, and dodecyldimethylbenzyl ammonium chloride.

6. The environmentally friendly multifunctional coconut-scented microcapsule for artificial boards according to claim 1, characterized in that: The average particle size of the microcapsules is 30-150 microns, preferably 50-100 microns.

7. The environmentally friendly multifunctional coconut-scented microcapsule for artificial boards according to claim 1, characterized in that: The microcapsules can withstand high temperature treatment of at least 200° C. for no less than 5 minutes and can withstand a pressure of at least 5 MPa.

8. A method for preparing the environmentally friendly multifunctional coconut-scented microcapsules for artificial boards according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, core material preparation: natural coconut essence and quaternary ammonium salt antibacterial and mildew-proof agent are mixed evenly, and an emulsifier is optionally added to prepare an oil phase core material solution; Step S2, preparing a wall material solution: dissolving the at least two natural polymer wall material materials separately or in combination in an aqueous solvent to prepare a wall material solution; Step S3, emulsification: adding the oil phase core material solution obtained in step S1 to one or more wall material solutions obtained in step S2, and emulsifying under high-speed shear conditions to form an O / W emulsion; Step S4, encapsulation: adjusting the pH value and temperature of the emulsion system or adding a coagulant to deposit the wall material on the surface of the oil droplets to form primary microcapsules; Step S5, secondary coating: performing secondary coating on the surface of the primary microcapsules by changing the conditions or adding a second wall material solution to form a double-layer wall structure; Step S6, curing and cross-linking: adding an appropriate amount of cross-linking agent to cure the microcapsule wall material to enhance the strength and stability of the wall material; Step S7, post-processing: centrifuging, washing, and drying the solidified microcapsule suspension to obtain the environmentally friendly multifunctional coconut-flavored microcapsule powder.

9. The method for preparing an environmentally friendly multifunctional coconut-scented microcapsule for artificial boards according to claim 8, characterized in that: The emulsification temperature in step S3 is controlled at 30-60° C., and the high-speed shear rate is 5000-15000 rpm.

10. The method for preparing an environmentally friendly multifunctional coconut-scented microcapsule for artificial boards according to claim 8, characterized in that: The cross-linking agent in step S6 is selected from at least one of glutaraldehyde, tannic acid, sodium tripolyphosphate or enzyme preparation.

Images