A multi-color and multi-flavor shaving board and a preparation method thereof

Abstract

This invention provides a multi-colored and multi-fragrant particleboard and its preparation method, belonging to the field of building materials technology. The multi-colored and multi-fragrant particleboard of this invention includes a substrate layer and a functional layer; the functional layer includes a color functional layer and a fragrance functional layer, which are mapped to each other; the substrate layer includes 30-50% surface wood fiber fines and 50-70% core wood chips; the functional layer is attached and penetrated to the side of the core wood chips close to the surface wood fiber fines, using functional additives including dyes and microcapsule slow-release fragrance particles, at 0.5-1.5% and 0.1-3% of the wood chips, respectively. Through spray penetration and three-stage hot-pressing molding technology, the uniformity of color and fragrance distribution, the duration of fragrance slow release, and the enhancement of personalized selection and visual effects are improved.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, specifically relating to a multi-colored and multi-fragrant particleboard and its preparation method. Background Technology

[0002] While current building materials products have achieved practicality, there is still room for improvement in terms of sensory customization to meet the high-level pursuit of personalized and emotional spaces by contemporary consumers. With the development of industries such as home customization and commercial space design, people have increasingly higher requirements for the compatibility of building materials with the overall decoration style, as well as the creation of a suitable atmosphere through sensory attributes.

[0003] Current technologies for enhancing the functionality of engineered wood panels include impregnating the surface with decorative materials such as veneer paper to achieve pattern and color decorative effects; and adding functional additives to the panels, such as antibacterial, anti-mildew, and fragrance components. Patent CN111421624A discloses a slow-release aromatic veneer panel and its manufacturing method. The panel consists of a surface panel, a core panel, and a base panel. The core panel has through-holes on its surface filled with microcapsules. These microcapsules are porous silica shells encapsulating lavender essential oil. The panels are bonded together by cold or hot pressing with white glue and urea-formaldehyde resin to form a panel with a long-lasting, slow-release fragrance. This patent describes a single-color, single-fragrance veneer product, highlighting the slow-release technology, but the product's function is limited and cannot meet personalized needs. Patent CN104608228B discloses an antibacterial, mildew-resistant, and aromatic oriented strand board (OSB) and its preparation process. The OSB comprises a core layer and a surface layer, with a surface adhesive layer on the surface. The antibacterial and mildew-resistant agent is a mixture of peppermint extract and isatis root extract, and the aromatic agent is microcapsule-encapsulated peppermint oil. The OSB is produced using a five-stage hot-pressing technique. However, this five-stage hot-pressing technique involves temperatures exceeding 180℃, which can easily cause microcapsules to rupture, affecting the slow-release and antibacterial effects. Furthermore, the antibacterial and mildew-resistant agent is located on the surface layer, making it susceptible to wear and tear during use. Patent CN119077873A discloses a long-lasting fragrance essential oil microcapsule-faced engineered wood panel and its preparation method. It uses impregnated paper and creates waist-shaped holes in the surface veneer to encapsulate the fragrance essential oil microcapsules in the surface layer. This patent requires creating holes in the veneer to embed the fragrance essential oil microcapsules, increasing the technical difficulty.

[0004] Existing technologies often involve adding color and fragrance to the surface layer, which significantly affects the durability of the function due to surface wear and makes it difficult to achieve a consistent color across the entire board. Adding functional properties often involves simple mixing with adhesives or using decorative paper or impregnated film, which can negatively impact integration, durability, and controlled release within the core layer of the board. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a multi-colored and multi-fragrant particleboard and its preparation method. One objective of this invention is to achieve color and fragrance matching by associating specific color systems with fragrance types, enhancing the interaction between smell and sight, controlling the optimal ratio of microcapsule sustained-release fragrance particles and dyes, and solving the problems of color and odor product stability and easy wear. Another objective of this invention is to solve the problems of uniform color and fragrance distribution, sustained fragrance release time, and the potential failure of microcapsule sustained-release fragrance particles due to high temperatures by using spray penetration and three-stage hot-pressing molding technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: On one hand, this invention proposes a multi-colored and multi-fragrant particleboard, comprising: a substrate layer and a functional layer; the functional layer includes: a color functional layer and a fragrance functional layer; the color functional layer and the fragrance functional layer are in a mapping relationship; by mass percentage, the substrate layer comprises: 30-50% surface wood fiber fines and 50-70% core wood chips; the functional layer is attached to and penetrates the core wood chips on the side close to the surface wood fiber fines; the functional additives of the functional layer include: dyes and microcapsule slow-release fragrance particles; the dyes are 0.5-1.5% of the core wood chips; the microcapsule slow-release fragrance particles are 0.1-3% of the core wood chips.

[0007] In this invention, the substrate layer consists of a surface layer of fine wood fibers and a core layer of wood shavings. A color and fragrance functional layer are attached to and permeated within the core wood shavings. Water-based dyes and microcapsule-released fragrance particles are attached to and permeate into the wood shavings according to a specific ratio. This allows the color and fragrance functional layers to synergistically enhance each other based on a preset mapping relationship, associating specific color schemes with specific fragrances and providing a variety of fragrance and color matching simulation systems to enhance personalized choices. Unlike existing technologies that decorate the substrate surface with color and fragrance, this invention allows them to permeate and adhere to the wood shavings, effectively preventing wear and tear and improving stability by preventing them from floating on the surface. Furthermore, the microporous structure of the wood shavings eliminates the need for drilling the substrate, reducing operating costs and wood loss. The porous structure formed by the fine wood fibers and wood shavings effectively binds the microcapsule-released fragrance particles, ensuring a sustained fragrance release time. Compared to drilling, this method can accommodate more color and fragrance factors, achieving a more uniform distribution of color and fragrance.

[0008] Preferably, the wood fiber fines are any one of pine, oak, cherry, cedar, red oak, oak, and ash with a moisture content of less than 2.5%.

[0009] Preferably, the microcapsule sustained-release fragrance particles have a particle size of 10-200 μm; the microcapsule materials in the microcapsule sustained-release fragrance particles include, but are not limited to, gelatin-nano SiO2, paraffin, starch, and montmorillonite.

[0010] This invention utilizes microcapsule-release fragrance particles with good mechanical strength, capable of resisting mechanical forces such as pre-pressing and hot pressing during installation. They also exhibit good heat resistance and are not easily deactivated, forming a fragrance functional layer. The particle sizes are categorized into 10-50μm, 50-100μm, and 100-200μm, creating a gradient for protection and release. Small-diameter microcapsule-release fragrance particles are well-distributed within the pores of the wood shavings, resulting in minimal breakage under mechanical forces and during the initial use, providing the initial fragrance. Medium and large-diameter microcapsule-release fragrance particles provide fragrance storage and release capabilities for medium and long-term use, allowing for sustained fragrance release in response to changes in ambient temperature and humidity or friction during use, ensuring long-lasting fragrance retention. The microcapsule materials used in this invention are all environmentally friendly. Among them, the nano-SiO2 in gelatin-nano SiO2 can improve the mechanical strength and thermal stability of gelatin, reduce the breakage rate during processing, and achieve long-lasting fragrance release during use. Paraffin wax has strong sealing properties, and the fragrance can be released when the ambient temperature reaches its melting point. In addition, paraffin wax has good hydrophobicity, which can play a waterproof role. Montmorillonite effectively fixes fragrance factors with its layered structure, prolongs the fragrance diffusion path, and achieves slow-release and long-lasting fragrance.

[0011] Preferably, the dye includes: aqueous dye, inorganic nanoscale pigment powder; with a concentration of 5-10%.

[0012] This invention addresses the influence of the wood substrate itself by controlling the dye concentration, thereby achieving a sufficiently uniform color functional layer with varying shades. It avoids problems such as insufficient coloring, uneven color, difficulty in covering the substrate's original color, and negative impact on visual effects.

[0013] Preferably, the fragrance of the fragrance functional layer includes, but is not limited to, lavender, citrus, lemon, bamboo, sandalwood, medicinal, tea, sage, and marine scents, and the corresponding colors of the color functional layer include, but are not limited to, purple, yellow, green, red, blue-green, sage, and blue; the combination of fragrance and color includes, but is not limited to, different color combinations with different fragrances, and the same color combinations with different fragrances.

[0014] The multi-color and multi-scent combinations of this invention include, but are not limited to, green combinations of grassy scents, green combinations of bamboo scents, red combinations of black tea scents, red combinations of rose scents, blue combinations of ocean scents, purple combinations of lavender scents, yellow combinations of osmanthus scents, yellow combinations of lemon scents, yellow combinations of sweet orange scents, and rainbow combinations of fruit scents. Through the scientific combination of colors and scents, it can stimulate multi-sensory interaction for users and supports customized solutions.

[0015] Preferably, the functional additives further include: an adhesive, a paraffin emulsion waterproofing agent, and a light stabilizer; the adhesive comprises 3.5-5.5% of the core layer wood shavings; the paraffin emulsion waterproofing agent comprises 0.1-1.5% of the core layer wood shavings; and the solid content of the paraffin emulsion waterproofing agent is 50%.

[0016] This invention controls the proportions of various functional additives, ensuring that the mixture has good fluidity and does not cause clogging of processing equipment during processing, thus achieving the desired decorative effect, further enhancing adhesion strength, and improving the product's water resistance and light stability.

[0017] On the other hand, the present invention provides a method for preparing multi-colored and multi-fragrant particleboard, comprising the following steps: S1: Screen the core layer wood shavings and the surface layer wood fiber fines, and control the moisture content; S2: Simultaneously spray the dye and adhesive onto the core layer of wood shavings; S3: After pre-mixing the microcapsule sustained-release fragrance particles and functional additives into a suspension, spray them simultaneously onto the core layer of wood shavings. S4: Layer the core wood shavings and the surface wood fiber fines and pre-press them; S5: Perform gradient temperature controlled hot pressing molding; S6: Perform post-processing, including edge trimming, sanding, and secondary curing.

[0018] Preferably, in step S5, the gradient temperature-controlled hot pressing molding includes: a pre-curing stage, at room temperature, with a pressure of 2 MPa and a duration of 1 min; a main pressing stage, at ≤180℃, with a pressure of 8 MPa and a duration of 4 min; and a pressure relief stage, at a temperature of ≤90℃, with a pressure of 0 MPa and a duration of 2 min.

[0019] This invention utilizes gradient temperature-controlled hot pressing molding, which is divided into three stages, with uniform temperature and pressure changes. The room temperature pre-curing stage aims to allow the adhesive to initially cross-link and fix the board structure under room temperature and low pressure conditions, activating the adhesion of the outer layer of microcapsules. This also prevents sudden increases in temperature and pressure that could lead to dye migration and the breakage of numerous microcapsule sustained-release fragrance particles. The main pressing stage increases temperature and pressure to fully cure the adhesive, ensuring a strong bond between the wood fiber and wood shavings, enhancing static bending strength. Simultaneously, the temperature is controlled to not exceed the temperature resistance threshold of the microcapsule material for the sustained-release fragrance particles, preventing breakage and loss. The pressure relief stage uniformly reduces the temperature to a level far below the softening temperature of the microcapsule material, releasing pressure evenly and eliminating internal vapor pressure. This effectively reduces the breakage rate of the sustained-release fragrance particles, prevents board surface cracking, and avoids bubbling or delamination caused by rapid moisture vaporization in the board, resulting in uniform color and fragrance distribution and long-lasting aroma.

[0020] Preferably, in steps S2 and S3, the synchronous spraying adopts a high-pressure spraying system; in step S2, the spray gun pressure is 0.3MPa and the atomized particle size is ≤50μm.

[0021] In this invention, dyes and adhesives are sprayed simultaneously but independently, forming mist-like particles that adhere to and penetrate the core layer of wood shavings. This improves coloring efficiency and uniformity, solving problems such as color difference and spots that easily occur in traditional stirring and soaking processes, affecting aesthetics. Microcapsule-release fragrance particles and functional additives are moderated into a suspension. The purpose is to allow the functional additives to protect the microcapsule-release fragrance particles, encapsulating them within the microcapsules. Simultaneously sprayed onto the core layer of wood shavings, the fragrance is not only retained on the surface but also slowly released from within the board, prolonging fragrance retention time. Simultaneously, the functional additives further impart waterproof and light-stable properties to the product.

[0022] Preferably, in step S1, the core layer wood shavings are 1-5 mm thick and the surface layer wood fiber is 0.2-1 mm thick, and the moisture content is controlled to be ≤2% under the conditions of 120℃ and 15 min.

[0023] This invention separates wood shavings and wood fiber fines by size. The purpose is that larger wood shavings can provide a high-strength skeleton, and the pores they form can hold more microcapsule slow-release fragrance particles, while also being more conducive to the adhesion and penetration of dyes. Wood fiber fines can fill the gaps, ensuring that the board surface is flat, dense and smooth.

[0024] Preferably, in step S4, the surface layer of wood fiber fines containing adhesive has a thickness of 2 mm, and the core layer of wood shavings containing microcapsule slow-release fragrance particles and dye has a thickness of 16 mm; the pre-pressing is carried out using a roller press with a pressure of 0.5 MPa and a compression rate of 15%, forming a continuous slab.

[0025] Compared with the prior art, the present invention has the following beneficial effects: This invention extends the decoration of color and fragrance beyond the surface of the substrate, allowing it to penetrate and adhere to the wood shavings. This effectively prevents wear and tear, eliminates the need for drilling the substrate, reduces operating costs, and minimizes wood loss. The porous structure formed by the wood fiber fines and wood shavings effectively traps the microcapsule-release fragrance particles, ensuring a sustained fragrance release. The gradient temperature-controlled hot-pressing process of this invention, divided into three stages with uniform temperature and pressure changes, effectively reduces the breakage rate of the microcapsule-release fragrance particles, prevents board surface cracking, and avoids bubbling or delamination caused by rapid moisture vaporization in the board. Detailed Implementation

[0026] The following examples further illustrate the present invention, but the scope of protection of the present invention is not limited thereto.

[0027] Example 1 A method for preparing multi-colored and multi-fragrant particleboard includes the following steps: S1: The core layer pine wood shavings (1-5mm) and the surface layer pine wood fines (0.2-1mm) are sieved through a vibrating screen and dried in a drum dryer at 120℃ for 15 minutes, controlling the moisture content to ≤2%, and controlling the mass percentage of core layer pine wood shavings to be 60% and the mass percentage of surface layer pine wood fines to be 40% in the substrate layer; S2: The adhesive is a formaldehyde-free MDI adhesive with a viscosity of 300-500 MPa•s, which is sprayed simultaneously with the cobalt blue water-based dye onto the core layer pine wood shavings through a high-pressure spraying system. The MDI adhesive accounts for 4.5% of the core layer pine wood shavings, the cobalt blue water-based dye accounts for 0.5% of the core layer pine wood shavings, the concentration of the cobalt blue water-based dye is 10%, the atomized particle size of the cobalt blue water-based dye does not exceed 50 μm, and the spray gun pressure is 0.3 MPa. S3: A suspension is prepared by pre-mixing a double-layer gelatin-nano SiO2 marine fragrance microcapsule sustained-release fragrance particles with a particle size of 10-200μm and a paraffin emulsion waterproofing agent. The suspension is then simultaneously sprayed onto the core layer of pine wood shavings. The marine fragrance microcapsule sustained-release fragrance particles account for 0.5% of the core layer of pine wood shavings, and the paraffin emulsion waterproofing agent accounts for 0.8% of the core layer of pine wood shavings. S4: The core layer of pine wood shavings and the surface layer of pine wood fines are laid in layers and pre-pressed. The surface layer of pine wood fines, including adhesive, has a thickness of 2mm. The core layer of pine wood shavings, including microcapsule slow-release fragrance particles and dyes, has a thickness of 16mm. The pre-pressing is carried out using a roller press with a pressure of 0.5MPa and a compression rate of 15%, forming a continuous slab. S5: Perform gradient temperature-controlled hot pressing molding. In the pre-curing stage, the pressure is 2MPa and the time is 1min at room temperature. In the main pressing stage, the pressure is 8MPa and the time is 4min at 180℃. In the depressurization stage, the pressure is 0MPa and the time is 2min when the temperature is reduced to 90℃. S6: Post-processing is performed, including edge trimming and sanding. After cooling, the edges are trimmed to a size of 2440×1220×18mm with a sanding accuracy of ±0.1mm. Secondary curing uses UV final curing at a wavelength of 385nm and an intensity of 100mW / cm². 2 The duration is 20 seconds.

[0028] Example 2 A method for preparing multi-colored and multi-fragrant particleboard includes the following steps: S1: The core layer pine wood shavings (1-5mm) and the surface layer pine wood particles (0.2-1mm) are sieved through a vibrating screen and dried in a drum dryer at 110℃ for 20 minutes, controlling the moisture content to ≤2%, and controlling the mass percentage of core layer pine wood shavings to be 65% and the mass percentage of surface layer pine wood particles to be 35% in the substrate layer; S2: The adhesive is a formaldehyde-free MDI adhesive with a viscosity of 300-500 MPa•s, which is sprayed simultaneously with the yellow water-based dye onto the core layer pine wood shavings through a high-pressure spraying system. The MDI adhesive accounts for 5% of the core layer pine wood shavings, the yellow water-based dye accounts for 0.5% of the core layer pine wood shavings, the concentration of the yellow water-based dye is 10%, the atomized particle size of the yellow water-based dye does not exceed 50 μm, and the spray gun pressure is 0.3 MPa. S3: A suspension is prepared by pre-mixing a double-layer gelatin-nano SiO2 osmanthus-scented microcapsule sustained-release fragrance particle with a particle size of 50-100μm and a paraffin emulsion waterproofing agent. The suspension is then simultaneously sprayed onto the core layer of pine wood shavings. The osmanthus-scented microcapsule sustained-release fragrance particle is 1% of the core layer of pine wood shavings, and the paraffin emulsion waterproofing agent is 0.8% of the core layer of pine wood shavings. S4: The core layer of pine wood shavings and the surface layer of pine wood fines are laid in layers and pre-pressed. The surface layer of pine wood fines, including adhesive, has a thickness of 2mm. The core layer of pine wood shavings, including microcapsule slow-release fragrance particles and dyes, has a thickness of 16mm. The pre-pressing is carried out using a roller press with a pressure of 0.5MPa and a compression rate of 15%, forming a continuous slab. S5: Perform gradient temperature-controlled hot pressing molding. In the pre-curing stage, the pressure is 2MPa and the time is 1min at room temperature. In the main pressing stage, the pressure is 8MPa and the time is 4min at 180℃. In the depressurization stage, the pressure is 0MPa and the time is 2min when the temperature is reduced to 90℃. S6: Post-processing is performed, including edge trimming and sanding. After cooling, the edges are trimmed to a size of 2440×1220×18mm with a sanding accuracy of ±0.1mm. Secondary curing uses UV final curing at a wavelength of 385nm and an intensity of 100mW / cm². 2 The duration is 20 seconds.

[0029] Example 3 A method for preparing multi-colored and multi-fragrant particleboard includes the following steps: S1: The core layer pine wood shavings (1-5mm) and the surface layer pine wood fines (0.2-1mm) are sieved through a vibrating screen and dried in a drum dryer at 120℃ for 15 minutes, controlling the moisture content to ≤2%, and controlling the mass percentage of core layer pine wood shavings to be 60% and the mass percentage of surface layer pine wood fines to be 40% in the substrate layer; S2: The adhesive is a formaldehyde-free MDI adhesive with a viscosity of 300-500 MPa•s, which is sprayed simultaneously with the green water-based dye onto the core layer pine wood shavings through a high-pressure spraying system. The MDI adhesive accounts for 4.5% of the core layer pine wood shavings, the green water-based dye accounts for 1% of the core layer pine wood shavings, the concentration of the green water-based dye is 8%, the atomized particle size of the green water-based dye does not exceed 50 μm, and the spray gun pressure is 0.3 MPa. S3: A suspension is prepared by pre-mixing a double-layer gelatin-nano SiO2 bamboo-scented microcapsule sustained-release fragrance particle with a particle size of 50-200μm and a paraffin emulsion waterproofing agent. The suspension is then simultaneously sprayed onto the core layer of pine wood shavings. The bamboo-scented microcapsule sustained-release fragrance particle is 0.5% of the core layer of pine wood shavings, and the mass ratio of bamboo fragrance to microcapsule material is 1:2. The paraffin emulsion waterproofing agent is 0.8% of the core layer of pine wood shavings. S4: The core layer of pine wood shavings and the surface layer of pine wood fines are laid in layers and pre-pressed. The surface layer of pine wood fines, including adhesive, has a thickness of 2mm. The core layer of pine wood shavings, including microcapsule slow-release fragrance particles and dyes, has a thickness of 16mm. The pre-pressing is carried out using a roller press with a pressure of 0.5MPa and a compression rate of 15%, forming a continuous slab. S5: Perform gradient temperature-controlled hot pressing molding. In the pre-curing stage, the pressure is 2MPa and the time is 1min at room temperature. In the main pressing stage, the pressure is 8MPa and the time is 4min at 180℃. In the depressurization stage, the pressure is 0MPa and the time is 2min when the temperature is reduced to 90℃. S6: Post-processing is performed, including edge trimming and sanding. After cooling, the edges are trimmed to a size of 2440×1220×18mm with a sanding accuracy of ±0.1mm. Secondary curing uses UV final curing at a wavelength of 385nm and an intensity of 100mW / cm². 2 The duration is 20 seconds.

[0030] Example 4 A method for preparing multi-colored and multi-fragrant particleboard includes the following steps: S1: The core layer oak shavings (1-5mm) and the surface layer oak fines (0.2-1mm) are sieved through a vibrating screen and dried in a drum dryer at 120℃ for 15 minutes, controlling the moisture content to ≤2%, and controlling the mass percentage of core layer oak shavings and surface layer oak fines in the substrate layer to be 50%; S2: The adhesive is a formaldehyde-free MDI adhesive with a viscosity of 300-500 MPa•s, which is sprayed simultaneously with the green water-based dye onto the core oak shavings through a high-pressure spraying system. The MDI adhesive accounts for 5% of the core oak shavings, the green water-based dye accounts for 0.5% of the core oak shavings, the concentration of the green water-based dye is 5%, the atomized particle size of the green water-based dye does not exceed 50 μm, and the spray gun pressure is 0.3 MPa. S3: A suspension is prepared by pre-mixing a double-layer gelatin-nano SiO2 lime-scented microcapsule sustained-release fragrance particle with a particle size of 10-200μm and a paraffin emulsion waterproofing agent. The suspension is then simultaneously sprayed onto the core layer of oak shavings. The lime-scented microcapsule sustained-release fragrance particle is 1% of the core layer of oak shavings, and the paraffin emulsion waterproofing agent is 1.5% of the core layer of oak shavings. S4: Core oak shavings and surface oak fines are layered and pre-pressed. The surface oak fines, including adhesive, are laid with a thickness of 2.2 mm, and the core oak shavings, including microcapsule slow-release fragrance particles and dyes, are laid with a thickness of 15.8 mm. Pre-pressing is carried out using a roller press with a pressure of 0.7 MPa and a compression rate of 15%, forming a continuous slab. S5: Perform gradient temperature-controlled hot pressing molding. In the pre-curing stage, the pressure is 2MPa and the time is 1min at room temperature. In the main pressing stage, the pressure is 8MPa and the time is 4min at 180℃. In the depressurization stage, the pressure is 0MPa and the time is 2min when the temperature is reduced to 80℃. S6: Post-processing is performed, including edge trimming and sanding. After cooling, the edges are trimmed to a size of 2440×1220×18mm with a sanding accuracy of ±0.1mm. Secondary curing uses UV final curing at a wavelength of 385nm and an intensity of 100mW / cm². 2 The duration is 20 seconds.

[0031] Example 5 A method for preparing multi-colored and multi-fragrant particleboard includes the following steps: S1: The core layer cherry wood shavings (1-5mm) and the surface layer pine wood particles (0.2-1mm) are sieved through a vibrating screen and dried in a drum dryer at 120℃ for 15 minutes, controlling the moisture content to ≤2%, and controlling the mass percentage of the core layer cherry wood shavings to be 70% and the mass percentage of the surface layer pine wood particles to be 30% in the substrate layer; S2: The adhesive is a formaldehyde-free MDI adhesive with a viscosity of 300-500 MPa•s, which is sprayed simultaneously with the red water-based dye onto the core layer of pine wood shavings through a high-pressure spraying system. The MDI adhesive accounts for 5.5% of the core layer of cherry wood shavings, the red water-based dye accounts for 1.5% of the core layer of cherry wood shavings, the concentration of the red water-based dye is 5%, the atomized particle size of the red water-based dye does not exceed 50 μm, and the spray gun pressure is 0.3 MPa. S3: A suspension is prepared by pre-mixing a double-layer gelatin-nano SiO2 black tea-scented microcapsule sustained-release fragrance particle with a particle size of 50-200μm and a paraffin emulsion waterproofing agent. The suspension is then simultaneously sprayed onto the core layer of cherry wood shavings. The black tea-scented microcapsule sustained-release fragrance particle is 3% of the core layer of cherry wood shavings, and the paraffin emulsion waterproofing agent is 1.5% of the core layer of cherry wood shavings. S4: The core layer of cherry wood shavings and the surface layer of cherry wood fines are laid in layers and pre-pressed. The surface layer of cherry wood fines, including adhesive, has a thickness of 2mm. The core layer of cherry wood shavings, including microcapsule slow-release fragrance particles and dyes, has a thickness of 16mm. The pre-pressing is carried out using a roller press with a pressure of 0.5MPa and a compression rate of 15% to form a continuous slab. S5: Perform gradient temperature-controlled hot pressing molding. In the pre-curing stage, the pressure is 2MPa and the time is 1min at room temperature. In the main pressing stage, the pressure is 8MPa and the time is 4min at 180℃. In the depressurization stage, the pressure is 0MPa and the time is 2min when the temperature is reduced to 90℃. S6: Post-processing is performed, including edge trimming and sanding. After cooling, the edges are trimmed to a size of 2440×1220×18mm with a sanding accuracy of ±0.1mm. Secondary curing uses UV final curing at a wavelength of 385nm and an intensity of 100mW / cm². 2 The duration is 20 seconds.

[0032] Example 6 A method for preparing multi-colored and multi-fragrant particleboard includes the following steps: S1: The core layer pine wood shavings (1-5mm) and the surface layer pine wood fines (0.2-1mm) are sieved through a vibrating screen and dried in a drum dryer at 120℃ for 15 minutes, controlling the moisture content to ≤2%, and controlling the mass percentage of core layer pine wood shavings to be 60% and the mass percentage of surface layer pine wood fines to be 40% in the substrate layer; S2: The adhesive is a formaldehyde-free MDI adhesive with a viscosity of 300-500 MPa•s, mixed with sage-colored water-based dye and light stabilizer UV1198, and simultaneously sprayed onto the core layer of pine wood shavings through a high-pressure spraying system. The MDI adhesive accounts for 4.5% of the core layer of pine wood shavings, the sage-colored water-based dye accounts for 0.5% of the core layer of pine wood shavings, the concentration of the sage-colored water-based dye is 10%, the light stabilizer UV1198 accounts for 0.2% of the core layer of pine wood shavings, the atomized particle size of the sage-colored water-based dye does not exceed 50 μm, and the spray gun pressure is 0.3 MPa. S3: A suspension is prepared by pre-mixing a double-layer gelatin-nano SiO2 marine fragrance microcapsule sustained-release fragrance particles with a particle size of 10-200μm and a paraffin emulsion waterproofing agent. The suspension is then simultaneously sprayed onto the core layer of pine wood shavings. The marine fragrance microcapsule sustained-release fragrance particles account for 0.5% of the core layer of pine wood shavings, and the paraffin emulsion waterproofing agent accounts for 0.8% of the core layer of pine wood shavings. S4: The core layer of pine wood shavings and the surface layer of pine wood fines are laid in layers and pre-pressed. The surface layer of pine wood fines, including adhesive, has a thickness of 2mm. The core layer of pine wood shavings, including microcapsule slow-release fragrance particles and dyes, has a thickness of 16mm. The pre-pressing is carried out using a roller press with a pressure of 0.5MPa and a compression rate of 15%, forming a continuous slab. S5: Perform gradient temperature-controlled hot pressing molding. In the pre-curing stage, the pressure is 2MPa and the time is 1min at room temperature. In the main pressing stage, the pressure is 8MPa and the time is 4min at 180℃. In the depressurization stage, the pressure is 0MPa and the time is 2min when the temperature is reduced to 90℃. S6: Post-processing is performed, including edge trimming and sanding. After cooling, the edges are trimmed to a size of 2440×1220×18mm with a sanding accuracy of ±0.1mm. Secondary curing uses UV final curing at a wavelength of 385nm and an intensity of 100mW / cm². 2 The duration is 20 seconds.

[0033] Comparative Example 1 The only difference between this comparative example and Example 1 is the particle size of the 300-500μm double-layer gelatin-nano SiO2 marine fragrance microcapsule sustained-release flavor particles.

[0034] Comparative Example 2 The only difference between this comparative example and Example 1 is that the cobalt blue water-based dye is 3% of the core layer pine wood shavings.

[0035] Comparative Example 3 The only difference between this comparative example and Example 1 is that step S5 involves a one-step hot pressing molding process at 200°C, with a pressure of 8 MPa and a duration of 6 minutes.

[0036] Comparative Example 4 The only difference between this comparative example and Example 1 is that the concentration of the cobalt blue aqueous dye is 20%.

[0037] Comparative Example 5 The only difference between this comparative example and Example 1 is that in step S2, the MDI adhesive and cobalt blue water-based dye are mixed and sprayed simultaneously onto the core layer of pine wood shavings.

[0038] Performance tests were conducted on Examples 1-6 and Comparative Examples 1-5, and the test results are shown in Table 1 below. As shown in Table 1, Examples 1-6 of this invention, by controlling the optimal ratio of microcapsule sustained-release fragrance particles to dyes and employing spray penetration and three-stage hot-press molding technologies, achieved static bending strength, 24-hour water absorption thickness expansion rate, color difference, fragrance duration, and formaldehyde release all meeting the testing standards. Specifically, the static bending strength was significantly higher than 16 MPa, demonstrating strong bending resistance; the 24-hour water absorption thickness expansion rate was significantly lower than 12%, maintaining dimensional stability in humid environments; the color difference was significantly lower than 1.5, resulting in wood panel products without obvious color spots or variations, exhibiting good aesthetic appeal; the fragrance retention time was relatively long, with fragrance sustained-release rates significantly higher than 80%; and it met the formaldehyde-free standard.

[0039] This invention, through associating specific color schemes with fragrances and conducting tests, demonstrates that the mapping relationship between color and fragrance can effectively enhance the interaction between smell and sight. For example, red combined with black tea can have anti-aging and invigorating effects; orange combined with citrus can uplift mood; yellow combined with osmanthus can soothe nerves; green combined with bamboo can relieve fatigue; green combined with lime can refresh and invigorate; sage combined with sage can have antibacterial and insect-repellent effects; purple combined with lavender can soothe nerves and aid sleep; and rainbow-colored combined with fruity scents can meet the design needs of children's rooms. These combinations are just examples and not exhaustive. This invention also controls the ratio of microcapsule sustained-release fragrance particles to dyes, avoiding visual or olfactory overload that could cause user discomfort. Instead, it effectively enhances the user experience, meets personalized needs, improves quality of life, and brings comfort and relaxation.

[0040] In this invention, when the microcapsule sustained-release fragrance particles have a particle size of 10-200 μm, the small-diameter particles can provide the initial fragrance to the wood board during processing, while the medium and large-diameter particles can ensure the longevity of the fragrance retention, which can last for more than 20 months. However, as shown in Comparative Example 1, the microcapsule sustained-release fragrance particles with a particle size of 300-500 μm are too large. These particles can affect the bonding between the wood shavings, causing uneven distribution due to settling and compression during installation, resulting in stress defects, incomplete bonding inside the wood board, and the generation of a large number of water-absorbing pores. During hot pressing, they are prone to accumulation, compression, and cracking, causing the fragrance to be released in large quantities in the early stages of processing and use, greatly reducing the fragrance retention time in the later stages. Therefore, excessively large-diameter microcapsule sustained-release fragrance particles not only reduce static bending strength but also reduce the 24-hour water absorption thickness expansion rate and shorten the fragrance duration.

[0041] This invention employs a three-stage hot-pressing molding technology. The room temperature pre-curing stage activates the adhesiveness of the microcapsule outer layer; the main pressing stage ensures complete curing of the adhesive and guarantees that the temperature does not exceed the temperature resistance threshold of the microcapsule material containing the sustained-release fragrance particles, reducing its loss rate; and the pressure relief stage effectively prevents the board surface from cracking. According to the test results of Example 1 and Comparative Example 2, the one-step hot-pressing molding technology lacks the structural stabilization through room temperature pre-curing and the protection of the microcapsules through low-temperature pressure relief. It directly applies high temperature and high pressure to the wood board structure, leading to an increased breakage rate of the sustained-release fragrance particles, significant release and loss of fragrance during processing, insufficient fragrance retention during use, and a sudden decrease in pressure of the vapor inside the wood board at high temperatures, which can easily cause bulging, delamination, or even board surface cracking.

[0042] Compared to Example 1, Comparative Examples 2 and 4 respectively employed excessive dye dosage and excessive dye concentration. Excessive dye dosage resulted in a thicker color functional layer, affecting adhesion. Furthermore, excessive dye dosage and concentration reduced atomization during spraying, leading to larger droplets, localized color accumulation, and uneven coloring, increasing color difference and affecting visual appearance. In Comparative Example 5, compared to Example 1, the dye and adhesive were mixed and sprayed simultaneously. This mixing affected the adhesive viscosity, reducing adhesion. The poorer adhesion damaged the wood board structure, reduced static bending strength, and allowed moisture to penetrate more easily, increasing the water absorption and thickness expansion rate. Additionally, the uneven distribution of both dyes during spraying resulted in uneven coloring, significantly increasing color difference, and potentially clogging the spraying system, increasing processing difficulty.

Claims

1. A particle board having a multi-color multi-fragrance, characterized by, include: Substrate layer, functional layer; The functional layers include: a color functional layer and a fragrance functional layer; the color functional layer and the fragrance functional layer have a mapping relationship. By weight percentage, the substrate layer comprises: 30-50% surface wood fiber fines and 50-70% core wood shavings; The functional layer is attached to and penetrates the core layer wood shavings on the side close to the surface wood fiber fines; The functional additives in the functional layer include: dyes and microcapsule sustained-release fragrance particles; The dye comprises 0.5-1.5% of the core layer wood shavings; the microcapsule sustained-release fragrance particles comprise 0.1-3% of the core layer wood shavings.

2. The multi-colored and multi-flavored shaving board according to claim 1, wherein, The microcapsule sustained-release fragrance particles have a particle size of 10-200μm; The microcapsule materials in the microcapsule sustained-release flavor particles include, but are not limited to, gelatin-nano SiO2, paraffin, starch, and montmorillonite.

3. A multi-colored and multi-fragrant particleboard according to claim 1 or 2, characterized in that, The dyes include: water-based dyes and inorganic nano-sized pigment powders; the concentration is 5-10%.

4. The multi-colored and multi-fragrant particleboard according to claim 1, characterized in that, The fragrances of the fragrance functional layer include, but are not limited to, lavender, citrus, lemon, bamboo, sandalwood, medicinal, tea, sage, and marine scents, and the colors of the corresponding color functional layer include, but are not limited to, purple, yellow, green, red, blue-green, sage, and blue. The combination of fragrance and color includes, but is not limited to, different color combinations with different fragrances, and the same color combinations with different fragrances.

5. A multi-colored and multi-fragrant particleboard according to claim 1 or 2, characterized in that, The functional additives also include: adhesives, paraffin emulsion waterproofing agents, and light stabilizers; The adhesive comprises 3.5-5.5% of the core layer wood shavings; The paraffin emulsion waterproofing agent is 0.1-1.5% of the core layer wood shavings; the solid content of the paraffin emulsion waterproofing agent is 50%.

6. A method for preparing multi-colored and multi-fragrant particleboard, characterized in that, Includes the following steps: S1: Screen the core layer wood shavings and the surface layer wood fiber fines, and control the moisture content; S2: Simultaneously spray the dye and adhesive onto the core layer of wood shavings; S3: After pre-mixing the microcapsule sustained-release fragrance particles and functional additives into a suspension, spray them simultaneously onto the core layer of wood shavings. S4: Layer the core wood shavings and the surface wood fiber fines and pre-press them; S5: Perform gradient temperature controlled hot pressing molding; S6: Perform post-processing, including edge trimming, sanding, and secondary curing.

7. The method for preparing a multi-colored and multi-fragrant particleboard according to claim 6, characterized in that, In step S5, gradient temperature-controlled hot pressing includes: During the pre-curing stage, the pressure was 2 MPa and the time was 1 min at room temperature. During the main compression stage, at ≤180℃, the pressure is 8MPa and the duration is 4min. During the depressurization phase, the temperature is reduced to ≤90℃, the pressure is 0MPa, and the duration is 2min.

8. A method for preparing multi-colored and multi-fragrant particleboard according to claim 6, characterized in that, In steps S2 and S3, the synchronous spraying uses a high-pressure spraying system; in step S2, the spray gun pressure is 0.3MPa and the atomized particle size is ≤50μm.

9. A method for preparing multi-colored and multi-fragrant particleboard according to claim 6, characterized in that, In step S1, the core layer wood shavings are 1-5mm thick and the surface layer wood fiber is 0.2-1mm thick, and the moisture content is controlled to be ≤2% under the conditions of 120℃ and 15min.

10. A method for preparing a multi-colored and multi-fragrant particleboard according to claim 6, characterized in that, In step S4, the surface layer of wood fiber fines containing adhesive has a thickness of 2 mm, and the core layer of wood shavings containing microcapsule slow-release fragrance particles and dye has a thickness of 16 mm; the pre-pressing is carried out using a roller press with a pressure of 0.5 MPa and a compression rate of 15%, forming a continuous slab.

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