Jasmine plate as well as preparation method and application thereof

Abstract

The invention relates to a jasmine plate as well as a preparation method and application thereof. The method comprises the following steps: mixing jasmine flower petal powder with eucalyptus wood shavings for a surface layer to obtain a surface layer material; mixing the jasmine flower rhizome wood shavings and the eucalyptus wood shavings for the core layer to obtain a core layer material; and then sizing, paving, pre-pressing exhausting and hot-press forming are sequentially conducted, the physical and chemical properties of the obtained jasmine board meet the national standard for production and use of shaving boards, and the formaldehyde emission reaches the ENF-level limit requirement. The arabian jasmine flowers and rhizomes of the arabian jasmine flowers are used as key raw materials for chipboard production, the chipboard raw material source is widened, and the arabian jasmine flower fragrance is given to the chipboard Preferably, the surface layer material and the core layer material are uniformly mixed with a latent cell wall component in-situ self-excitation auxiliary agent before sizing, and in-situ excitation substance components efficiently participate in cementing interface construction under the condition of high-temperature hot pressing, so that the use amount of an adhesive is effectively saved, and the environmental protection property of the jasmine plate is ensured; the mechanical property and the dimensional stability of the prepared jasmine plate are remarkably improved, and the 24-hour water absorption thickness swelling rate is smaller than 8%.

Description

Technical Field

[0001] The invention relates to the technical field of artificial board production, in particular to a jasmine board and a preparation method and application thereof. Background Art

[0002] Particleboard is an important category of wood-based panels in my country, and its production capacity has been increasing year by year in recent years. A number of particleboard factories with an annual output of more than 400,000 cubic meters have been built and put into production. The rapid expansion of particleboard production capacity has significantly increased the pressure on raw material supply. Therefore, it is urgent to expand the source of particleboard raw materials. In addition, there is an overcapacity of particleboard products in the market, but the product technology content is low and the homogeneous competition is serious. It is still difficult to fully meet the terminal consumer market's demand for the integration of environmental protection and health functions of wood-based panels.

[0003] Hengxian County, Guangxi Zhuang Autonomous Region is the largest jasmine production base in my country, with a complete jasmine product processing industry chain; and the artificial board processing industry in Guangxi Zhuang Autonomous Region is also growing stronger. If the jasmine processing industry and the artificial board processing industry can be integrated, it will help promote the transformation and upgrading of both industries at the same time. It can be foreseen that incorporating all components of jasmine into the particleboard manufacturing process can not only efficiently utilize the jasmine rhizomes and the broken petals produced during the jasmine processing process, but also give the particleboard the aroma of jasmine, improve the product grade, and thus increase product benefits. More importantly, if the jasmine rhizomes that are the processing residues in the jasmine industry can be used as a source of particleboard raw materials, it can alleviate the excessive dependence of the particleboard processing industry on wood resources to a certain extent.

[0004] In addition, when using aldehyde resin as adhesive to prepare particleboard, it will easily lead to the problem of excessive formaldehyde emission from the board, which makes it difficult to meet the end-consumer market's demand for integrated environmental protection and health functions of artificial boards. To solve this problem, the mainstream existing technology uses formaldehyde-free adhesive pMDI to prepare particleboard. However, the particleboard obtained by this technical solution has the problem of poor dimensional stability of the board.

[0005] How to integrate the jasmine processing industry with the wood-based panel processing industry and produce panels that meet the needs of the terminal consumer market for the environmental protection and health functions of wood-based panels and have excellent performance is a major problem in this field. In fact, overcoming the above needs and problems to develop new products and their manufacturing technologies is an important supplement to the terminal consumer market, that is, the demand for the environmental protection and health functions of wood-based panels. Summary of the invention

[0006] The present invention aims to use jasmine flowers and their rhizomes as key components for manufacturing particleboards, and to construct a particleboard product with jasmine fragrance and environmental protection. To this end, the present invention proposes to prepare jasmine-scented boards by paving jasmine flowers and their rhizomes in different areas; jasmine flowers are arranged on the surface shavings to make it easier for their fragrance to diffuse into the environment, giving the board the fragrance of jasmine flowers; at the same time, jasmine rhizomes are arranged on the core shavings to replace part of the wood shavings, so as to reduce production costs and increase product profit margins.

[0007] In view of this, the main purpose of the present invention is to provide a jasmine board and its preparation method and application. The technical problem to be solved is that on the basis of making full use of jasmine and its rhizome resources, the physical and chemical properties of the jasmine board obtained meet the national standards for the production and use of particleboards, and the formaldehyde emission reaches E NF Level limit requirements.

[0008] The purpose of the present invention and the solution to the technical problem are achieved by adopting the following technical solutions.

[0009] A method for preparing a jasmine board according to the present invention comprises the following steps:

[0010] Adding jasmine rhizome shavings to eucalyptus shavings for the core layer to obtain a core layer material; the mass proportion of the jasmine rhizome shavings in the core layer material is 5 to 20%;

[0011] Adding jasmine petal powder to eucalyptus wood shavings for the surface layer to obtain a surface layer material; the mass proportion of the jasmine petal powder in the surface layer material is 1 to 5%;

[0012] Applying glue to the surface layer material and the core layer material respectively; adding a waterproofing agent during the gluing;

[0013] The surface layer material, the core layer material and the surface layer material are laid in sequence to obtain a slab;

[0014] The slab is pre-pressed into shape and hot-pressed to obtain a jasmine board.

[0015] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0016] Preferably, in the aforementioned preparation method, the eucalyptus shavings for the core layer and the eucalyptus shavings for the surface layer are both peeled eucalyptus shavings.

[0017] Preferably, in the aforementioned preparation method, before the step of adding jasmine petal powder to the surface eucalyptus shavings, the step further comprises passing the jasmine petal powder through a 80-100 mesh sieve.

[0018] Preferably, in the aforementioned preparation method, during the gluing process, the adhesive applied to the surface material and the core material is one or more of isocyanate glue, lignin-based adhesive and melamine-modified low molar ratio urea-formaldehyde resin.

[0019] In addition, in order to reduce the amount of glue applied and avoid the problem of harmful gas release caused by the large-scale use of adhesives, the present invention also proposes a technical route to ensure high-quality gluing of particleboard by adding an in-situ self-excitation auxiliary agent of latent cell wall components during the preparation of jasmine board. The in-situ self-excitation auxiliary agent of latent cell wall components is used to treat the particleboard raw materials, and in the subsequent high-temperature hot pressing process, the efficient melt flow and chemical catalytic reconstruction of the material components are achieved, thereby significantly improving the ability of the raw material's own components to participate in the formation of the gluing interface, promoting the efficient formation of the gluing interface between the material component units during the jasmine board forming process, ensuring the gluing quality, and thus achieving the goal of reducing the amount of glue used and improving product stability.

[0020] Preferably, the aforementioned preparation method further comprises the following steps:

[0021] Before the surface layer material and the core layer material are glued, an in-situ self-excitation auxiliary agent of latent cell wall components is applied to the surface layer material and the core layer material.

[0022] Preferably, in the aforementioned preparation method, the in-situ self-excitation auxiliary agent for the latent cell wall component is any one of choline chloride, betaine and zinc chloride.

[0023] Preferably, in the aforementioned preparation method, the in situ self-excitation auxiliary agent for latent cell wall components is sprayed into the surface material and the core material in the form of an aqueous solution with a mass concentration of 10 to 15%; and in terms of solid content, the application amount of the in situ self-excitation auxiliary agent for latent cell wall components is 0.5 to 2.5% of the absolute dry mass of the raw materials of the surface material and the core material.

[0024] The purpose of the present invention and the solution to the technical problem are further achieved by adopting the following technical solutions.

[0025] The jasmine board comprises an upper surface layer, a core layer and a lower surface layer from top to bottom;

[0026] The upper surface layer and the lower surface layer both contain jasmine petal powder and eucalyptus wood; the mass proportion of the jasmine petal powder in the upper surface layer and / or the lower surface layer is 1-5%;

[0027] The core layer comprises jasmine rhizome components and eucalyptus wood; the mass proportion of the jasmine rhizome components in the core layer is 5-20%.

[0028] Preferably, the aforementioned jasmine board, wherein the formaldehyde emission reaches E NF Level limit requirements.

[0029] The purpose of the present invention and the solution to the technical problem are further achieved by adopting the following technical solutions.

[0030] The invention discloses an application of a jasmine-scented board in the fields of furniture, construction, packaging and flooring.

[0031] By means of the above technical solution, the jasmine board and its preparation method and application described in the present invention have at least the following advantages:

[0032] 1. The present invention applies jasmine petal powder to the surface layer of the jasmine board to replace part of the eucalyptus raw material used for the surface layer; applies jasmine rhizome shavings to the core layer of the jasmine board to replace part of the eucalyptus raw material used for the core layer; regulates the proportion of jasmine petal powder in the surface layer material of the jasmine board, and limits the proportion of jasmine rhizome in the core layer material of the jasmine board, so that the obtained jasmine board meets the national standards for the production and use of particleboards, and the formaldehyde emission reaches E NF The preparation method of the jasmine-scented board proposed in the present invention successfully embeds jasmine flowers into the surface layer of the particle board, giving the particle board the function of releasing the jasmine fragrance for a long time; the jasmine rhizomes are used to replace part of the eucalyptus raw materials and used in the core layer of the particle board. The use of this part of the jasmine rhizomes makes it possible to get rid of the admixture of eucalyptus bark, avoiding the negative impact of a large amount of eucalyptus bark on the performance of the particle board product, and is also of great significance to the improvement of the jasmine processing industry chain.

[0033] 2. Preferably, the eucalyptus shavings for the core layer and the eucalyptus shavings for the surface layer are both peeled eucalyptus shavings, so as to avoid the interference of odorous substances on the aroma of jasmine and achieve the reduction and control of odorous substances in particleboard products.

[0034] 3. The present invention also proposes that: before the surface material and the core material are glued, the surface material and the core material are respectively mixed evenly with the in-situ self-excitation auxiliary agent of the latent cell wall component, and the cell wall components of each material component in the surface material and the core material are stimulated to flow efficiently and chemically reconstruct under high temperature conditions, thereby enhancing the ability of each material component to participate in the construction of the bonding interface, improving the interface quality, and thus achieving the effect of saving the amount of adhesive, avoiding the problem of harmful gas release caused by the large amount of adhesive used, and ensuring the environmental protection of the jasmine board; at the same time, reducing the production cost; the mechanical properties and dimensional stability of the jasmine board prepared by this method are significantly improved, and the 24h water absorption thickness expansion rate is less than 8%.

[0035] 4. The method for preparing jasmine board proposed in the present invention is compatible with the current level of particleboard manufacturing equipment and production technology routes, and can be promoted and applied on a large scale.

[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, features and performances of the jasmine board and its preparation method and application proposed by the present invention are described in detail below in combination with the preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0038] The present invention is further described below with reference to specific embodiments, but is not intended to be limiting of the present invention.

[0039] The present invention provides a method for preparing a jasmine board, comprising the following steps:

[0040] Adding jasmine rhizome shavings to eucalyptus shavings for the core layer to obtain a core layer material; the mass proportion of the jasmine rhizome shavings in the core layer material is 5 to 20%;

[0041] Adding jasmine petal powder to eucalyptus wood shavings for the surface layer to obtain a surface layer material; the mass proportion of the jasmine petal powder in the surface layer material is 1 to 5%;

[0042] Applying glue to the surface layer material and the core layer material respectively; adding a waterproofing agent during the gluing;

[0043] The surface layer material, the core layer material and the surface layer material are laid in sequence to obtain a slab;

[0044] The slab is pre-pressed into shape and hot-pressed to obtain a jasmine board.

[0045] In the above technical solution, the eucalyptus wood shavings for the core layer and the eucalyptus wood shavings for the surface layer can be obtained from the market or can be obtained by oneself.

[0046] The present invention is obtained by self-production in some embodiments, and the specific method is as follows:

[0047] First, the eucalyptus wood is planed into flakes with a width of 5 to 20 mm, a length of 10 to 30 mm, and a thickness of 1 to 3 mm; then the eucalyptus flakes are crushed into eucalyptus wood shavings with a width of 0.1 to 4 mm, a length of 1 to 15 mm, and a thickness of 0.1 to 2 mm.

[0048] Further, the eucalyptus shavings are screened, and eucalyptus shavings with a width of 0.5 to 3 mm, a length of 10 to 25 mm, and a thickness of 0.5 to 1.5 mm are taken as eucalyptus shavings for the core layer; and shavings with a size smaller than the eucalyptus shavings for the core layer are taken as eucalyptus shavings for the surface layer.

[0049] Preferably, in the above technical solution, the eucalyptus shavings for the core layer and the eucalyptus shavings for the surface layer are both peeled eucalyptus shavings. The present invention selects peeled eucalyptus shavings to avoid the interference of odorous substances on the fragrance of jasmine flowers, and achieves the reduction and control of odorous substances in particleboard products.

[0050] In the above-mentioned technical solution, the mass proportion of the jasmine petal powder in the surface material is 1-5%; the reason why the present invention strictly limits the mass proportion of the jasmine petal powder in the surface material is that: 1) the jasmine petal powder in the jasmine fragrance board contains volatile substances such as terpenes and phenylpropanes, so that it can provide a pleasant jasmine fragrance; however, since the jasmine petal powder contains volatile substances such as terpenes and phenylpropanes, when the content is too large or the concentration is too high, it may have a negative impact on the human body; the present invention strictly limits the mass proportion of the jasmine petal powder in the surface material to 1 ~5%, the jasmine fragrance of the prepared jasmine board is pleasant, but it does not have a negative impact on the human body, ensuring the healthy use of the jasmine board; 2) Compared with eucalyptus wood, the jasmine petal powder in the jasmine board lacks wood fiber, so the mechanical strength of the jasmine petal powder is weak. Therefore, when the jasmine petal powder replaces part of the surface eucalyptus wood, it will have a greater impact on the surface bonding strength of the particle board, especially the static bending strength; strictly limit the mass proportion of petal powder in the surface material to 1-5%, so as to ensure that the surface bonding strength of the prepared jasmine board reaches the national standard for the production and use of particle board. If the mass percentage of jasmine petal powder in the surface material is less than 1%, the prepared jasmine board cannot emit jasmine fragrance well; if the mass percentage of jasmine petal powder in the surface material is higher than 5%, the static bending strength of the prepared jasmine board will not meet the national standard for the production and use of particle board. At the same time, the excessive jasmine fragrance not only brings odor pollution to the production environment, but also may have a negative impact on the human body.

[0051] In the aforementioned technical solution, the mass percentage of the jasmine rhizome shavings in the core layer material is 5-20%; the reason why the present invention strictly limits the mass percentage of the jasmine rhizome shavings in the core layer material is that compared with the eucalyptus shavings for the core layer, the lignin content in the jasmine rhizome shavings is lower, and the thin-walled cells are prone to collapse during high-temperature hot pressing, making the rigidity and hardness of the jasmine rhizome significantly lower than the eucalyptus shavings for the core layer. Replacing part of the eucalyptus shavings for the core layer with jasmine rhizome shavings will have a greater impact on the bonding strength of the core layer of the particleboard. The present invention strictly limits the mass percentage of jasmine rhizome shavings in the core layer material of the jasmine board to ensure that the internal bonding strength of the prepared jasmine board meets the national standards for the production and use of particleboards. When the mass percentage of jasmine rhizome shavings in the core layer material of the jasmine board is 5-20%, the jasmine rhizome shavings have little effect on the internal bonding strength of the jasmine board and are beneficial to cost control; when the mass percentage of jasmine rhizome shavings in the core layer material of the jasmine board is higher than 20%, the internal bonding strength of the prepared jasmine board does not meet the national standards for the production and use of particleboards.

[0052] In some embodiments of the above technical solution, the waterproofing agent accounts for 0.5-1.5% of the surface layer material or the core layer material in terms of solid mass.

[0053] In the above technical solution, the jasmine petal powder can be commercially available or homemade.

[0054] In some embodiments of the present invention, jasmine petal powder is obtained by self-production, and the specific method is as follows:

[0055] The jasmine petals are air-dried, crushed into fine powder, and sieved to obtain jasmine petal powder; considering that the moisture content of jasmine flowers and the coarseness of jasmine petal powder will affect the subsequent amount of glue applied and the mechanical strength of the prepared board, in order to make the static bending strength of the board obtained on the basis of a lower amount of glue applied later meet the standard or even better, in some embodiments of the present invention, the jasmine flowers are air-dried to a moisture content of 7-12%, and then crushed into fine powder, and passed through a sieve of 80-100 mesh to obtain jasmine petal powder by screening.

[0056] In the above technical solution, the jasmine rhizome shavings can be commercially available or homemade.

[0057] In some embodiments of the present invention, rhizome shavings are obtained by self-production, and the specific method is as follows:

[0058] The rhizomes of jasmine are air-dried and crushed to obtain jasmine rhizome shavings; considering the subsequent amount of glue applied and the strength of the prepared board, in order to make the internal bonding strength of the board obtained in the subsequent preparation process meet the standard or even better on the basis of a lower amount of glue applied, in some embodiments of the present invention, the jasmine rhizomes are air-dried to a moisture content of 10-15%, and then crushed into shavings with a width of 0.5-5 mm, a length of 3-10 mm, and a thickness of 0.1-1.0 mm.

[0059] Preferably, in some embodiments, the adhesive applied to the surface layer material and the core layer material of the present invention is one or more of isocyanate adhesive, lignin-based adhesive and melamine-modified low molar ratio urea-formaldehyde resin. The aforementioned adhesive can be used to tightly bond the shavings raw materials of the jasmine board, and the obtained jasmine board has good mechanical properties and dimensional stability.

[0060] In some embodiments of the aforementioned technical scheme, during the paving process, the surface material, core layer material, and surface layer material are paved in sequence from bottom to top to obtain a slab having a lower surface layer, a core layer, and an upper surface layer; in order to ensure better mechanical properties and dimensional stability of the jasmine board, the mass ratio of the total mass of the upper and lower surface layer raw materials to the core layer material is 30:70 to 50:50; the moisture content of the upper and lower surface layer raw materials is 12-16%; the moisture content of the core layer raw material is 6-8%.

[0061] Preferably, in the aforementioned technical solution, in order to better ensure the dimensional stability and mechanical properties of the board during the hot pressing process, in some embodiments, the hot pressing temperature is 180-220°C, the hot pressing factor is 5-15s / mm, and the moisture content of the particleboard product is 6-10%.

[0062] The physical and chemical properties of the jasmine board prepared by the method of the present invention meet the national standards for the production and use of particleboards, and the formaldehyde emission reaches E NF Level limit requirements.

[0063] Preferably, in the aforementioned technical solution, before gluing, the surface layer material and the core layer material are each uniformly mixed with an in-situ self-excitation auxiliary agent for latent cell wall components.

[0064] The latent cell wall component in situ self-excitation auxiliary agent (hereinafter referred to as "excitation auxiliary agent" or "auxiliary agent") described in the present invention refers to a substance that can stimulate the efficient flow and chemical reconstruction of the cell wall components of a substance under high temperature conditions.

[0065] The technical solution of the present invention can stimulate the efficient flow and chemical reconstruction of material cell wall components under high temperature conditions, so as to enhance the ability of various material components in the surface material and the core material to participate in the construction of the bonding interface, improve the interface quality, and thus achieve the effect of saving the amount of adhesive, avoid the release of harmful gases caused by the large amount of adhesive used, better ensure the environmental protection of the jasmine board, and reduce the production cost.

[0066] Preferably, the excitation aid is any one of choline chloride, betaine, and zinc chloride. The selection of these three excitation aids can better stimulate the efficient flow and chemical reconstruction of the cell wall components of the core layer material and the surface layer material of the present invention, so as to enhance the ability of the surface layer material and the core layer material to participate in the construction of the bonding interface, improve the interface quality, and thus not only achieve the effect of saving the amount of adhesive, but also ensure that the mechanical properties and dimensional stability of the prepared jasmine board are significantly improved.

[0067] Preferably, in the aforementioned technical scheme, the excitation aid is sprayed into the surface material and the core material in the form of an aqueous solution with a mass concentration of 10 to 15%; the mass concentration of the aqueous solution of the excitation aid is strictly limited so that the excitation aid has good solubility in water, which is conducive to uniform spraying; in addition, when the mass concentration of the effective substance in the aqueous solution of the excitation aid is too low, excessive moisture may be introduced into the surface material and the core material during the spraying of the excitation aid, which will not only affect the subsequent sizing, but also may affect the mechanical properties and dimensional stability of the prepared jasmine board.

[0068] Preferably, in the above technical solution, the spraying amount in the surface material and the core material is: the application amount of the excitation aid (in terms of solid content) is 0.5-2.5% of the absolute dry mass of the raw materials of the surface material and the core material. In some embodiments, the application amount of choline chloride (in terms of solid content) is 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5% of the absolute dry mass of the raw materials of the surface material and the core material. In other embodiments, the amount of zinc chloride applied (in terms of solid content) is 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5% of the absolute dry mass of the raw materials of the surface layer material and the core layer material. In other embodiments, the amount of betaine applied (in terms of solid content) is 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5% of the absolute dry mass of the raw materials of the surface layer material and the core layer material. The reason for strictly limiting the amount of the excitation aid applied is that: during the process of applying the excitation aid to the surface material, the volatile substances in part of the jasmine petal powder of the surface material will be activated under the action of the excitation aid. When the amount of the excitation aid added is too large, too much jasmine petal powder of the surface material will be activated, which will not only affect the purpose of obtaining a jasmine scented board with jasmine fragrance of the present invention, but also cause the jasmine scented board to produce a larger odor, thus possibly affecting the application of the jasmine scented board; in addition, due to the high-temperature hot pressing process, the hemicellulose in the core material and the surface material is easily degraded under the action of the excitation aid, and Compared with eucalyptus shavings, jasmine rhizome shavings contain a higher proportion of hemicellulose. Therefore, when too much excitation auxiliary agent is added, the jasmine rhizome shavings in the core layer material are greatly affected. It is worth noting that both jasmine petal powder and rhizome shavings contain a large amount of cyclohexane. During the high-temperature hot pressing process, excessive excitation auxiliary agent promotes the decomposition of cyclohexane and forms decomposition products that have a coloring effect on wood materials, making the color of the prepared jasmine board darker, affecting the aesthetics of the jasmine board, and thus affecting the application of jasmine board in high-end furniture, packaging and flooring.Therefore, the present invention strictly controls the usage amount of the excitation auxiliary agent, effectively balances the excitation effect of the excitation auxiliary agent on the cell wall components of the surface material and the core material, and the activation of the volatile components of the jasmine petal powder in the surface material, and the influence on the hemicellulose in the core material and the surface material, reduces or even avoids the decomposition of jasmine petal powder and jasmine rhizome shavings, so that the present invention can not only ensure that the physical and chemical properties of the jasmine-scented board prepared by using a lower content of adhesive meet the national standards for the production and use of particleboards, and ensure the environmental protection of the product; the jasmine-scented board has no odor, can provide a pleasant jasmine fragrance, and the prepared board has no obvious coloring, which promotes the application of the jasmine-scented board in the fields of high-end furniture, packaging and flooring.

[0069] In some embodiments of the above-mentioned technical solution, the present invention adjusts the moisture content of the surface layer material to which the excitation aid is applied to be dried to 6-10%, and dries the moisture content of the core layer material to which the excitation aid is applied to be dried to 2-4%.

[0070] In some embodiments, when using isocyanate adhesive (hereinafter referred to as "pMDI") for gluing, the amount of glue applied for the surface layer material is: pMDI is 1.5-3.5% of the total mass of the surface layer material (referred to as "the amount of pMDI surface layer glue applied is 1.5-3.5%"), and pMDI is 1-2.5% of the total mass of the core layer material (referred to as "the amount of pMDI core layer glue applied is 1-2.5%"). In other embodiments, when a lignin-based adhesive is used, the lignin-based solid content is 7-12% of the total mass of the surface material (referred to as "the surface sizing amount of lignin-based adhesive is 7-12%"), and the lignin-based solid content is 5-8% of the total mass of the core material (referred to as "the core sizing amount of lignin-based adhesive is 5-8%"); in other embodiments, when a low mole ratio urea-formaldehyde resin adhesive is used, the low mole ratio urea-formaldehyde resin is 8-13% of the total mass of the surface material (referred to as "the surface sizing amount of low mole ratio urea-formaldehyde resin adhesive is 8-13%"), and the low mole ratio urea-formaldehyde resin is 7-10% of the total mass of the core material (referred to as "the low mole ratio urea-formaldehyde resin sizing amount is 7-10%"). Preferably, during the gluing process, when different adhesives are applied to the surface material and the core material, the mixed adhesive contains pMDI to enhance the mechanical properties and dimensional stability of the prepared board.

[0071] The above technical solution is adopted to effectively save the amount of adhesive, ensure the environmental protection of the Jasmine board, and the formaldehyde emission reaches E NF The mechanical properties and dimensional stability of the prepared jasmine board are significantly improved, the 24h water absorption thickness expansion rate is less than 8%, and the physical and chemical properties of the jasmine board meet the national standards for the production and use of particleboard. The prepared jasmine board has no odor, the board has no obvious coloring, and has a strong aesthetic appearance, which is convenient for application in high-end furniture, packaging, flooring and other fields.

[0072] The present invention also provides a jasmine board, which comprises an upper surface layer, a core layer and a lower surface layer from top to bottom; the upper surface layer and the lower surface layer both contain jasmine petal components and eucalyptus wood; the mass proportion of the jasmine petal components in the upper surface layer and / or the lower surface layer of the jasmine board is 1-5%; the core layer contains jasmine rhizome components and eucalyptus wood; the mass proportion of the jasmine rhizome components in the core layer is 5-20%. The physical and chemical properties of the jasmine board meet the national standards for the production and use of particleboards, and the particleboard is endowed with a pleasant jasmine fragrance.

[0073] The invention also proposes application of the jasmine board in the fields of furniture, construction, packaging and flooring.

[0074] The present invention will be further described below in conjunction with specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0075] Unless otherwise specified, the materials, reagents, etc. involved below are all commercially available products well known to those skilled in the art; unless otherwise specified, the methods described are all methods well known in the art. Unless otherwise defined, the technical terms or scientific terms used should have the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0076] Example 1

[0077] This embodiment provides a jasmine board comprising the following steps:

[0078] 1) Raw material pretreatment

[0079] Pretreatment of Jasmine Flowers and Rhizomes

[0080] a: Jasmine flower pretreatment: The jasmine flower petals are first air-dried to a moisture content of 10%, then crushed, and passed through a 90-mesh sieve to obtain jasmine flower petal powder;

[0081] b: Pretreatment of jasmine rhizomes: first air-drying the jasmine rhizomes to a moisture content of 12%, and then crushing them into rhizome shavings with a width of 0.5-5 mm, a length of 3-10 mm, and a thickness of 0.1-1.0 mm;

[0082] Eucalyptus pretreatment

[0083] c: Preparation of eucalyptus shavings: eucalyptus is peeled and shaved into eucalyptus shavings with a width of 5 to 20 mm, a length of 10 to 30 mm, and a thickness of 1 to 3 mm; then the eucalyptus shavings are crushed into eucalyptus shavings with a width of 0.1 to 4 mm, a length of 1 to 15 mm, and a thickness of 0.1 to 2 mm;

[0084] d. Screening of eucalyptus shavings: The dried eucalyptus shavings are screened by sieving, and the eucalyptus shavings with a width of 0.5-3 mm, a length of 10-25 mm, and a thickness of 0.5-1.5 mm are screened into eucalyptus shavings for the core layer, and the eucalyptus shavings other than the core layer are screened into eucalyptus shavings for the surface layer;

[0085] 2) Preparation of surface and core materials of Jasmine board

[0086] Jasmine board surface material: jasmine petal powder is mixed with eucalyptus wood shavings for the surface layer, and the jasmine petal powder accounts for 3% of the jasmine board surface material;

[0087] Jasmine board core material: jasmine rhizome shavings are mixed with eucalyptus shavings for the core layer, and the jasmine rhizome shavings account for 15% of the jasmine board core material as the jasmine board core material;

[0088] 3) Gluing

[0089] The surface material and the core material of the Jasmine board obtained in step 2) are sizing treated respectively, wherein the adhesive used for the surface material is pMDI, and the sizing amount of the surface material is 3.5%; the glue used for the core material is pMDI, and the sizing amount of the core material is 2.5%; and emulsified paraffin is added as a waterproofing agent, and 1% of the mass of the Jasmine board surface material and / or the core material is added as a waterproofing agent (in terms of solid content);

[0090] 4) Paving

[0091] The surface layer and core layer of the Jasmine board after gluing are transported to the paving bin for paving separately. During paving, the upper and lower surface layers are fine materials, and the core layer is coarse materials. The total mass ratio of the upper and lower surface materials of the Jasmine board to the paving mass of the core layer is 40:60; the moisture content of the upper and lower surface materials is controlled to 14%, and the moisture content of the core layer material is controlled to 7%;

[0092] 5) Pre-pressure exhaust

[0093] Use a pre-pressing machine to pre-press the paved slab into shape and squeeze out the air in the slab;

[0094] 6) Hot Pressing

[0095] The pre-pressed board obtained in step 5) is sent to a press for hot pressing, wherein the hot pressing temperature is 180° C., the hot pressing factor is 5s / mm, and the moisture content of the particleboard product is 8%.

[0096] Example 2

[0097] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0098] 1) Raw material pretreatment

[0099] Pretreatment of Jasmine Flowers and Rhizomes

[0100] a: Jasmine flower pretreatment: The jasmine flower petals were first air-dried to a moisture content of 7%, and then crushed and passed through an 80-mesh sieve;

[0101] b: Pretreatment of jasmine rhizomes: first air-dry the jasmine rhizomes to a moisture content of 10%;

[0102] 2) Preparation of surface and core materials of Jasmine board

[0103] Jasmine board surface material: Jasmine petal powder accounts for 1% of the jasmine board surface material;

[0104] Jasmine board core material: Jasmine rhizome shavings account for 5% of the jasmine board core material;

[0105] 3) Gluing

[0106] The glue used for the surface material is a lignin-based adhesive, and the amount of glue applied to the surface material is 12%; 0.5% of the mass of the emulsified paraffin of the surface material and / or the core material of the Jasmine Board is added as a waterproofing agent (calculated by solid content);

[0107] 4) Paving

[0108] The total mass ratio of the upper and lower surface materials to the core material of the Moxiang board is 30:70; the moisture content of the upper and lower surface materials is controlled at 12%, and the moisture content of the core material is controlled at 6%;

[0109] 6) Hot Pressing

[0110] The hot pressing temperature is 220°C, the hot pressing factor is 15s / mm, and the moisture content of the particleboard product is 6%.

[0111] Example 3

[0112] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0113] 1) Raw material pretreatment

[0114] Pretreatment of Jasmine Flowers and Rhizomes

[0115] a: Jasmine flower pretreatment: air-dry the jasmine flower petals to a moisture content of 12% and pass through a 100-mesh sieve;

[0116] b: Pretreatment of jasmine rhizomes: first air-dry the jasmine rhizomes to a moisture content of 15%;

[0117] 2) Preparation of surface and core materials of Jasmine board

[0118] Jasmine board surface material: Jasmine petal powder accounts for 5% of the jasmine board surface material;

[0119] Jasmine board core material: Jasmine rhizome shavings account for 20% of the jasmine board core material;

[0120] 3) Gluing

[0121] The glue used for the surface material is a low molar ratio urea-formaldehyde resin adhesive, and the amount of glue applied to the surface material is 13%; 1.5% of the mass of the Jasmine board surface material and / or core material is added with emulsified paraffin as a waterproofing agent (calculated by solid content);

[0122] 4) Paving

[0123] The total mass ratio of the upper and lower surface materials to the core material of the Moxiang board is 50:50; the moisture content of the upper and lower surface materials is controlled at 16%, and the moisture content of the core material is controlled at 8%;

[0124] 6) Hot Pressing

[0125] The hot pressing temperature is 200°C, the hot pressing factor is 10s / mm, and the moisture content of the particleboard product is 10%.

[0126] Example 4

[0127] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0128] In step 3), during the gluing process, the glue used for the core layer material is a lignin-based adhesive, and the glue amount of the core layer material is 8%.

[0129] Example 5

[0130] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0131] In step 3), during the gluing process, the glue used for the core layer material is a low molar ratio urea-formaldehyde resin adhesive, and the glue amount of the core layer material is 10%.

[0132] Example 6

[0133] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0134] 3) Gluing

[0135] ①. Before the sizing of the surface material and the core material of the Jasmine Board in step 2), a 15% aqueous solution of zinc chloride is sprayed sequentially on the surface material and the core material of the Jasmine Board, and the spraying amount is: in terms of solid content, the applied mass of zinc chloride is 1% of the mass of the absolutely dry surface material and the core material of the Jasmine Board; the surface material and the core material of the Jasmine Board are mixed uniformly with zinc chloride; then the surface material of the Jasmine Board treated with zinc chloride is dried to a moisture content of 8%, and the core material of the Jasmine Board treated with zinc chloride is dried to a moisture content of 3%;

[0136] ②. Apply glue to the surface material of the jasmine board obtained by step ①. The adhesive used for the surface material is pMDI, and the amount of glue applied to the surface material is 1.5%; the glue used for the core material is pMDI, and the amount of glue applied to the core material is 1%.

[0137] Example 7

[0138] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0139] 3) Gluing

[0140] ①. Before the sizing of the surface material and the core material of the jasmine board in step 2), a 10% betaine aqueous solution is sprayed sequentially on the surface material and the core material of the jasmine board, and the spraying amount is: in terms of solid content, the applied mass of betaine is 0.5% of the mass of the absolutely dry surface material and the core material of the jasmine board; the surface material and the core material of the jasmine board are mixed uniformly with betaine; then the surface material of the jasmine board treated with betaine is dried to a moisture content of 6%, and the core material of the jasmine board treated with betaine is dried to a moisture content of 2%;

[0141] ②. Apply glue to the surface material of the jasmine board obtained by step ①. The adhesive used for the surface material is pMDI, and the amount of glue applied to the surface material is 1.5%; the glue used for the core material is pMDI, and the amount of glue applied to the core material is 1%.

[0142] Example 8

[0143] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0144] 3) Gluing

[0145] ①. Before the sizing of the surface material and the core material of the Jasmine Board in step 2), a 10% aqueous solution of choline chloride is sprayed sequentially on the surface material and the core material of the Jasmine Board, and the spraying amount is: in terms of solid content, the applied mass of choline chloride is 1.9% of the mass of the absolutely dry surface material and the core material of the Jasmine Board; the surface material and the core material of the Jasmine Board are mixed uniformly with choline chloride; then the surface material of the Jasmine Board treated with choline chloride is dried to a moisture content of 10%, and the core material of the Jasmine Board treated with choline chloride is dried to a moisture content of 4%;

[0146] ②. Apply glue to the surface material of the jasmine board obtained by step ①. The adhesive used for the surface material is pMDI, and the amount of glue applied to the surface material is 1.5%; the glue used for the core material is pMDI, and the amount of glue applied to the core material is 1%.

[0147] Example 9

[0148] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0149] 3) Gluing

[0150] ①. Before the sizing of the surface material and core material of the Jasmine Board in step 2), a 15% aqueous solution of choline chloride is sprayed sequentially on the surface material and the core material of the Jasmine Board, and the spraying amount is: in terms of solid content, the applied mass of choline chloride is 1% of the mass of the absolutely dry surface material and core material of the Jasmine Board; the surface material and the core material of the Jasmine Board are mixed uniformly with choline chloride; then the surface material of the Jasmine Board treated with choline chloride is dried to a moisture content of 8%, and the core material of the Jasmine Board treated with choline chloride is dried to a moisture content of 3%;

[0151] ②. Apply glue to the surface material of the jasmine board obtained by step ①. The adhesive used for the surface material is pMDI, and the amount of glue applied to the surface material is 1.5%; the glue used for the core material is pMDI, and the amount of glue applied to the core material is 1%.

[0152] Example 10

[0153] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0154] 3) Gluing

[0155] ①. Before the sizing of the surface material and the core material of the Jasmine Board in step 2), a 10% aqueous solution of choline chloride is sprayed sequentially on the surface material and the core material of the Jasmine Board, and the spraying amount is: in terms of solid content, the applied mass of choline chloride is 2.5% of the mass of the absolutely dry surface material and the core material of the Jasmine Board; the surface material and the core material of the Jasmine Board are mixed uniformly with choline chloride; then the surface material of the Jasmine Board treated with choline chloride is dried to a moisture content of 8%, and the core material of the Jasmine Board treated with choline chloride is dried to a moisture content of 3%;

[0156] ②. Apply glue to the surface material of the jasmine board obtained by step ①. The adhesive used for the surface material is pMDI, and the amount of glue applied to the surface material is 1.5%; the glue used for the core material is pMDI, and the amount of glue applied to the core material is 1%.

[0157] Embodiment 11

[0158] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0159] 3) Gluing

[0160] ①. Before the sizing of the surface material and the core material of the Jasmine Board in step 2), a 15% aqueous solution of choline chloride is sprayed sequentially on the surface material and the core material of the Jasmine Board, and the spraying amount is: in terms of solid content, the applied mass of choline chloride is 1.5% of the mass of the absolutely dry surface material and the core material of the Jasmine Board; the surface material and the core material of the Jasmine Board are mixed uniformly with choline chloride; then the surface material of the Jasmine Board treated with choline chloride is dried to a moisture content of 8%, and the core material of the Jasmine Board treated with choline chloride is dried to a moisture content of 3%;

[0161] ②. Apply glue to the surface material of the jasmine board obtained by step ①. The adhesive used for the surface material is pMDI, and the amount of glue applied to the surface material is 1.5%; the glue used for the core material is pMDI, and the amount of glue applied to the core material is 1%.

[0162] Example 12

[0163] The preparation process of this embodiment is basically the same as that of embodiment 1, except that:

[0164] In the eucalyptus shavings preparation process in step c, the eucalyptus is not peeled, and the eucalyptus is directly shaved into eucalyptus shavings with a width of 5 to 20 mm, a length of 10 to 30 mm, and a thickness of 1 to 3 mm; then the eucalyptus shavings are crushed into eucalyptus shavings with a width of 0.1 to 4 mm, a length of 1 to 15 mm, and a thickness of 0.1 to 2 mm.

[0165] Comparative Example 1

[0166] The preparation process of this comparative example is basically the same as that of Example 1, except that:

[0167] In step 2) the preparation process of the surface layer material and the core layer material of the jasmine board, the jasmine petal powder accounts for 8% in the surface layer material of the jasmine board.

[0168] Comparative Example 2

[0169] The preparation process of this comparative example is basically the same as that of Example 1, except that:

[0170] In step 2) the preparation process of the surface layer material and the core layer material of the jasmine board, the jasmine rhizome shavings account for 25% of the core layer material of the jasmine board.

[0171] Comparative Example 3

[0172] The preparation process of this comparative example is basically the same as that of Example 6, with the following differences: ①. Before gluing the surface layer material and core layer material of the jasmine board obtained in step 2), a 15% zinc chloride aqueous solution is sprayed on the surface layer material and the core layer material of the jasmine board in sequence, and the spraying amount is: based on solid content, the applied mass of zinc chloride is 0.2% of the mass of the absolutely dry surface layer material and core layer material of the jasmine board.

[0173] Comparative Example 4

[0174] The preparation process of this comparative example is basically the same as that of Example 6, with the following differences: ①. Before gluing the surface layer material and core layer material of the jasmine board obtained in step 2), a 15% zinc chloride aqueous solution is sprayed on the surface layer material and the core layer material of the jasmine board in sequence, and the spraying amount is: based on solid content, the applied mass of zinc chloride is 3% of the mass of the absolutely dry surface layer material and core layer material of the jasmine board.

[0175] The physical and mechanical properties of the jasmine board prepared in the above examples and comparative examples were measured according to GB / T 4897-2015 "Particleboard" requirements; the formaldehyde emission of the board was measured according to GB / T 39600-2021; and the odor of the jasmine board was tested and graded according to LY / T 3236-2020. The results are shown in Tables 1 and 2.

[0176] Table 1. Various indicators of Jasmine Board of Examples 1-12

[0177]

[0178] Table 2. Various indicators of comparative examples 1-4 Jasmine board

[0179]

[0180]

[0181] Odor level: Level 0, no odor; Level 1, slight odor; Level 2, obvious odor, but not unpleasant; Level 3, obvious odor that makes people feel uncomfortable; Level 4, unbearable odor.

[0182] It can be seen from the data in Table 1 and Table 2 that, by using the preparation method of the jasmine board provided by the present invention, before gluing the surface material and the core material of the jasmine board, if no excitation auxiliary agent is added, the internal bonding strength of the obtained jasmine board is 0.36-0.59MPa, the static bending strength is 11.53-14.22MPa, and the formaldehyde release reaches E NF The grade limit requirement is that the 24h water absorption thickness expansion rate is less than 12%, which meets the production and use requirements of particleboard.

[0183] Combined with Table 1, it can be seen from the embodiments and comparative examples that, by adopting the preparation method of the jasmine board provided by the present invention, an excitation aid is applied to the surface material and the core material of the jasmine board before gluing, and the applied amount of the excitation aid (in terms of solid content) is 0.5-2.5% of the absolute dry mass of the raw materials of the surface material and the core material, when a lower amount of adhesive is used, the bonding strength and static bending strength of the prepared jasmine board still all meet the national standards; preferably, when the applied amount of the excitation aid (in terms of solid content) is 0.5-1.9% of the absolute dry mass of the raw materials of the surface material and the core material, when a lower amount of adhesive is used, the internal bonding strength of the prepared jasmine board is 0.63-0.85MPa, the static bending strength is 14.99-15.63MPa, and the formaldehyde release reaches E NF The grade limit requirement is met, and the 24h water absorption thickness expansion rate is less than 8%. The dimensional stability, internal bonding strength and static bending strength of the prepared jasmine board are significantly enhanced; the amount of glue applied is significantly reduced, saving costs, and the jasmine board has no odor. However, when the amount of excitation aid applied (in terms of solid content) is less than 0.5% of the absolute dry mass of the raw materials of the surface material and the core material, as shown in Comparative Example 3, some of the properties of the jasmine board prepared using a lower dose of gelling agent do not meet the national standards. The reason is that the amount of excitation aid added by the preparation method of the present invention is too low, and the cell wall components of the various material components of the core material and the surface material cannot be completely stimulated to efficiently flow and chemically reconstruct, and thus the ability of the various material components in the surface material and the core material to participate in the construction of the bonding interface cannot be effectively improved. Therefore, when a lower dose of adhesive is used, it cannot be ensured that the mechanical properties and dimensional stability of the prepared jasmine board are up to standard. In addition, when the amount of excitation aid applied (measured in solid content) is higher than 2.5% of the absolute dry mass of the raw materials of the surface layer material and the core layer material, as shown in Comparative Example 4, some performance of the prepared jasmine board does not meet the national standards. The reason is that when the amount of excitation aid added by the preparation method of the present invention is too high, more hemicellulose will be degraded in the core layer material and the surface layer material during the high-temperature hot pressing process, which will cause the internal bonding strength and static bending strength of the jasmine board to drop significantly, so that the internal bonding strength of the prepared jasmine board does not meet the national standard. In addition, the volatile components of the jasmine petal powder in the surface material are activated by excessive excitation auxiliary agents during the high-temperature hot pressing process, so that the jasmine-scented board not only cannot provide the pleasant fragrance of jasmine flowers, but also forms an unpleasant odor; more importantly, adding more excitation auxiliary agents will cause the jasmine petal powder and the cyclohexane ether contained in the jasmine rhizomes to decompose during the high-temperature hot pressing process. The formed decomposition products have a coloring effect on the board, which is not conducive to the formation of a board with strong aesthetics, thereby affecting the application of the jasmine-scented board in the fields of high-end furniture, packaging and flooring.

[0184] Combining Table 1 with Table 2, it can be seen from Examples 1-12 that the odor level of the jasmine board prepared by the preparation method of the present invention and the use of unpeeled eucalyptus shavings can reach level 3, while the odor level of the jasmine board prepared by the use of peeled eucalyptus shavings can reach level 2 at most. The reason is that after the eucalyptus shavings are peeled, the interference of odorous substances on the jasmine fragrance is avoided, and the odorous substances of the particleboard product are reduced. In addition, the color of the jasmine board prepared by the unpeeled eucalyptus shavings is relatively dark, which affects the application of the jasmine board in the fields of high-end furniture, packaging and flooring.

[0185] Combining Table 1 and Table 2, analysis of the embodiments and comparative examples shows that when the preparation method of the present invention is used, when the mass proportion of jasmine petal powder in the surface material of the jasmine board is greater than 5%, the static bending strength of the jasmine board is significantly reduced; when the mass proportion of jasmine rhizome shavings in the core material of the jasmine board is greater than 20%; the internal bonding strength of the jasmine board is significantly reduced.

[0186] The technical features in the claims and / or the specification of the present invention may be combined, and the combination is not limited to the combination obtained by reference in the claims. The technical solution obtained by combining the technical features in the claims and / or the specification is also within the protection scope of the present invention.

[0187] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a jasmine board, characterized in that: The following steps are involved: Adding jasmine rhizome shavings to eucalyptus shavings for the core layer to obtain a core layer material; the mass proportion of the jasmine rhizome shavings in the core layer material is 5 to 20%; Adding jasmine petal powder to eucalyptus wood shavings for the surface layer to obtain the surface layer material; The mass percentage of the jasmine petal powder in the surface material is 1-5%; Applying glue to the surface layer material and the core layer material respectively; adding a waterproofing agent during the gluing; The surface layer material, the core layer material and the surface layer material are laid in sequence to obtain a slab; The slab is pre-pressed into shape and hot-pressed to obtain a jasmine board.

2. The preparation method according to claim 1, characterized in that The eucalyptus wood shavings for the core layer and the eucalyptus wood shavings for the surface layer are both peeled eucalyptus wood shavings.

3. The preparation method according to claim 2, characterized in that: Before the step of adding jasmine petal powder to the surface eucalyptus wood shavings, the step also includes passing the jasmine petal powder through a 80-100 mesh sieve.

4. The preparation method according to claim 3, characterized in that: In the gluing process, the adhesive applied to the surface layer material and the core layer material is one or more of isocyanate adhesive, lignin-based adhesive and melamine-modified low molar ratio urea-formaldehyde resin.

5. The preparation method according to any one of claims 1 to 4, characterized in that: The following steps are also included: Before the surface layer material and the core layer material are glued, an in-situ self-excitation auxiliary agent of latent cell wall components is applied to the surface layer material and the core layer material.

6. The preparation method according to claim 5, characterized in that: The latent cell wall component in-situ self-excitation auxiliary agent is any one of choline chloride, betaine and zinc chloride.

7. The preparation method according to claim 6, characterized in that: The latent cell wall component in-situ self-excitation auxiliary agent is sprayed into the surface layer material and the core layer material in the form of an aqueous solution with a mass concentration of 10-15%; Calculated by solid content, the application amount of the latent cell wall component in-situ self-excitation auxiliary agent is 0.5-2.5% of the absolute dry mass of the raw materials of the surface layer material and the core layer material.

8. A jasmine board, characterized in that: The jasmine board comprises an upper surface layer, a core layer and a lower surface layer from top to bottom; The upper surface layer and the lower surface layer both contain jasmine petal powder and eucalyptus wood; the mass proportion of the jasmine petal powder in the upper surface layer and / or the lower surface layer is 1-5%; The core layer comprises jasmine rhizome components and eucalyptus wood; the mass proportion of the jasmine rhizome components in the core layer is 5-20%.

9. The jasmine board according to claim 8, characterized in that: The jasmine board is prepared by the preparation method according to any one of claims 1 to 7, and the formaldehyde emission reaches E NF Level limit requirements.

10. Use of the jasmine board as claimed in claim 8 or 9 in the fields of furniture, construction, packaging and flooring.

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