Artificial board based on soybean-based adhesive and agricultural waste and preparation method thereof

Abstract

The invention discloses an artificial board based on a soybean-based adhesive and agricultural waste and a preparation method of the artificial board, and relates to the technical field of environment-friendly materials. The artificial board based on the soybean-based adhesive and the agricultural waste, provided by the invention, is mainly prepared by mixing the agricultural waste and the soybean-based adhesive and carrying out hot pressing; the agricultural waste is selected from one or more of corncob powder, rice hull powder, bagasse, wheat straw powder, corn straw powder, peanut shell powder, bamboo powder, wood dust powder, rice straw powder and soybean straw powder, and the soybean-based adhesive is a polymer modified soybean flavone adhesive or an organic silicon modified soybean flavone adhesive. According to the present invention, the recycling of the agricultural waste is achieved, the mechanical property of the obtained artificial board is excellent, the tensile strength can be up to 22.6 MPa, the 24 h water absorption rate is substantially lower than 5% of the GB / T 24508-2020 foaming type wood-plastic specification, and the 24 h water absorption thickness swelling rate is substantially lower than 0.5% of the GB / T 24508-2020 foaming type wood-plastic thickness direction specification.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly materials, and in particular to an artificial board based on soybean-based adhesive and agricultural waste and a preparation method thereof. Background Art

[0002] With the improvement of people's environmental awareness and the advancement of social sustainable development, the resource utilization of agricultural waste has gradually become a research hotspot. Agricultural waste, such as straw and rice husk, is huge in quantity, and its utilization rate is not high at present, which not only causes waste, but also the common treatment methods of agricultural waste, such as incineration, may also cause pollution to the environment.

[0003] As a common building material, composite panels have excellent physical properties and broad application prospects. In the preparation process of traditional composite panels, a large amount of fossil raw materials are often needed, which not only increases the production cost, but also is not conducive to environmental protection. Using agricultural waste to prepare composite panels is a feasible way to utilize agricultural waste as a resource, which can not only reduce the production cost of composite panels, but also reduce environmental pollution. Environmentally friendly agricultural waste composite panels have a wide range of applications and can be used in many fields such as construction and furniture. In the field of construction, this composite panel can be used as wall panels, floors, roofing materials, etc., with excellent mechanical properties; in the field of furniture, this composite panel can replace traditional wood or other artificial panels to reduce production costs. In short, the production and application of environmentally friendly agricultural waste composite panels are not only conducive to the recycling of resources and environmental protection, but also have broad market prospects and good economic benefits.

[0004] The prior art CN107189478A discloses a straw waste recycled environmentally friendly wear-resistant flame-retardant board and a preparation method thereof. The obtained board is prepared from adhesives, agricultural waste straw and other raw materials, and can realize the recycling of agricultural waste straw. However, the mechanical properties of the board are poor, the highest tensile strength is only 16MPa, and the lowest water absorption thickness expansion rate is as high as 2%, which limits its application scenarios.

[0005] Prior art CN118081931A discloses a method for preparing artificial boards using a bio-based adhesive, wherein the reed stems are pretreated with an alkaline solution, melamine and water are mixed to obtain a bio-based adhesive, and finally the adhesive and stems are fully stirred and cold-pressed and hot-pressed to obtain an artificial board. However, the melamine added to the adhesive has a certain toxicity and the adhesive undergoes two processes, hot pressing and cold pressing, and the reed stems need to be pretreated. The manufacturing process is cumbersome and is not suitable for large-scale promotion, which limits the scope of use.

[0006] The prior art CN111117561A discloses an enzyme-modified protein adhesive, which does not contain any harmful substances. However, this adhesive can only be used for hot pressing of single boards and cannot be directly used for hot pressing of some agricultural wastes. It only meets the GB / T 9846.7-2004 Level II standard, has poor performance, and is limited in application scenarios. Summary of the invention

[0007] The main purpose of the present invention is to provide a man-made board based on soybean-based adhesive and agricultural waste and a preparation method thereof, and to use agricultural waste resources to prepare composite boards to reduce the felling of forest resources and reduce the pressure on the natural environment.

[0008] According to one aspect of the present invention, there is provided a wood-based panel based on a soybean-based adhesive and agricultural waste, which is mainly prepared from agricultural waste and a soybean-based adhesive in a mass ratio of 1: (0.8-1):

[0009] The agricultural waste is selected from one or more of corn cob powder, rice husk powder, bagasse, wheat straw powder, corn straw powder, peanut shell powder, bamboo powder, sawdust powder, rice straw powder, and soybean straw powder;

[0010] The soybean-based adhesive is a polymer-modified soybean flavonoid adhesive or a silicone-modified soybean flavonoid adhesive;

[0011] The polymer modified soybean flavonoid adhesive comprises a terminal hydroxycarboxyl compound modified soybean flavonoid and a curing agent, wherein the terminal hydroxycarboxyl compound modified soybean flavonoid is mainly synthesized by a terminal hydroxycarboxyl compound and an epoxy soybean flavonoid through a ring-opening crosslinking reaction, and is specifically obtained by the following preparation method: the terminal hydroxycarboxyl compound, the epoxy soybean flavonoid, a phase transfer catalyst and an organic solvent are mixed and reacted at 75 to 85° C. for 1 to 3 hours to obtain the adhesive;

[0012] The organosilicon-modified soybean flavonoid adhesive comprises terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid, a crosslinking agent and an organic metal catalyst, wherein the terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid is mainly synthesized by a ring-opening crosslinking reaction of terminal hydroxycarboxyl polydimethylsiloxane and epoxy soybean flavonoid, and is specifically obtained by the following preparation method: terminal hydroxycarboxyl polydimethylsiloxane, epoxy soybean flavonoid, a phase transfer catalyst and an organic solvent are mixed, and reacted at a temperature of 75 to 85° C. for 1 to 3 hours to obtain the adhesive.

[0013] In the artificial board provided by the present invention, agricultural waste is used as a substrate, and has good interface bonding ability with two soybean-based adhesives, polymer-modified soybean flavonoid adhesive and organosilicon-modified soybean flavonoid adhesive, so that agricultural waste can be fully wrapped by the adhesive and tightly combined with the soybean-based adhesive. The fiber in the agricultural waste has high strength, good dispersibility and excellent specific surface area, so it can enhance the physical / mechanical interlocking ability with the soybean-based adhesive, thereby effectively transmitting stress and improving the mechanical properties of the prepared artificial board. Moreover, since the soybean-based adhesive itself has fluidity, in the process of manufacturing artificial boards using polymer-modified soybean flavonoid adhesive or organosilicon-modified soybean flavonoid adhesive, no solvent and water are mixed, so as to avoid bubbles in the artificial board, thereby affecting the performance.

[0014] At the same time, the artificial board prepared by polymer-modified soybean flavonoids adhesive has better hydrophobicity because the curing agent in the polymer-modified soybean flavonoids adhesive contains isocyanate, and a large amount of hydroxyl groups in agricultural waste react with isocyanate to form carbamate, and the polymer formed after the reaction of terminal hydroxycarboxyl compound modified soybean flavonoids and the curing agent has a cross-linked network structure; moreover, the polymer-modified soybean flavonoids adhesive enhances the mechanical adhesion ability of the fibers in the agricultural waste, and can better transfer the load external force to the agricultural waste fibers, thereby improving the tensile properties of the artificial board.

[0015] The artificial board prepared with silicone-modified soybean flavonoid adhesive has a higher residual carbon rate during thermogravimetric analysis, indicating that there are more stable substances in its structure. This is mainly because the silane curing agent in the silicone-modified soybean flavonoid adhesive reacts to form a Si-O-Si structure, which increases the cross-linking density of the system and limits the relative migration of molecular chains. In addition, the silicon element will form high-temperature resistant silicon dioxide under high temperature conditions, which can promote the formation of more carbon layers, thereby improving the overall structural stability of the artificial board.

[0016] In some embodiments, the curing agent can be any one or more of isophorone diisocyanate, toluene diisocyanate, and diphenylmethane diisocyanate, and the mass ratio of the curing agent to the terminal hydroxycarboxyl compound modified soybean flavonoids is 1: (5-7). When used, the curing agent is added to the terminal hydroxycarboxyl compound modified soybean flavonoids and mixed evenly to obtain a polymer modified soybean flavonoids adhesive working solution.

[0017] In some embodiments, when preparing terminal hydroxycarboxyl compound modified soybean flavonoids, the molar ratio of the terminal hydroxycarboxyl compound to the epoxy soybean flavonoids is (0.4-1.3):1, the phase transfer catalyst is selected from at least one of triethylamine, trioctylmethylammonium chloride, tetramethylammonium bromide, tetrapropylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium iodide, triethylbenzylammonium bromide, triethylhexylammonium bromide, and triethyloctylammonium bromide, and the amount of the phase transfer catalyst is 0.8% to 1.2% of the mass of the terminal hydroxycarboxyl compound; the organic solvent is selected from at least one of ethyl acetate, acetone, butanone, dimethyl sulfoxide, and dichloromethane.

[0018] In some embodiments, the epoxy soybean flavonoids are obtained by the following preparation method: mixing soybean flavonoids, a modifier, and a phase transfer catalyst, reacting at a temperature of 100 to 110° C. for 1 to 3 hours to obtain a reaction mixture; mixing the reaction mixture, an aqueous sodium hydroxide solution, and an organic solvent, reacting at room temperature for 4 to 6 hours, and separating, purifying, and drying the obtained reaction product to obtain epoxy soybean flavonoids.

[0019] The modifier is selected from one of epichlorohydrin and epibromohydrin, and the molar ratio of the modifier to soybean flavonoids is (10-15):1; the phase transfer catalyst is selected from at least one of triethylamine, trioctylmethylammonium chloride, tetramethylammonium bromide, tetrapropylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium iodide, triethylbenzylammonium bromide, triethylhexylammonium bromide and triethyloctylammonium bromide, and the amount of the phase transfer catalyst is 5%-8% of the mass of soybean flavonoids; the organic solvent is selected from at least one of ethyl acetate, acetone, butanone, dimethyl sulfoxide and dichloromethane; the concentration of sodium hydroxide in the sodium hydroxide aqueous solution is 45wt%-55wt%, and the mass ratio of the sodium hydroxide aqueous solution to soybean flavonoids is (0.8-1.5):1.

[0020] In some embodiments, the above-mentioned terminal hydroxyl carboxyl compound is prepared by the following method: mixing a terminal hydroxyl compound, maleic anhydride, a phase transfer catalyst and an organic solvent, and reacting at a temperature of 100 to 110°C for 1 to 3 hours to obtain a terminal hydroxyl carboxyl compound. Wherein, the terminal hydroxyl compound is selected from at least one of terminal hydroxyl polybutadiene and terminal hydroxyl polybutadiene acrylonitrile, and the molar ratio of the terminal hydroxyl compound to maleic anhydride is 1: (0.75 to 2.5); the phase transfer catalyst is selected from at least one of triethylamine, trioctylmethylammonium chloride, tetramethylammonium bromide, tetrapropylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium iodide, triethylbenzylammonium bromide, triethylhexylammonium bromide, and triethyloctylammonium bromide, and the amount of the phase transfer catalyst is 1% to 3% of the mass of the terminal hydroxyl compound; the organic solvent is selected from at least one of ethyl acetate, acetone, butanone, dimethyl sulfoxide, and dichloromethane.

[0021] In some embodiments, the organosilicon-modified soybean flavonoid adhesive comprises independently packaged terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid, a crosslinking agent and an organic metal catalyst, wherein the crosslinking agent may be at least one of methyltrimethoxysilane, vinyltributanoximosilane and propyltriacetoxysilane, and the mass of the crosslinking agent is 5% to 15% of the mass of the terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid; the organic metal catalyst is selected from at least one of dibutyltin dilaurate, stannous isooctanoate, zinc isooctanoate and bismuth isooctanoate, and the mass of the organic metal catalyst is 0.5% to 2.5% of the mass of the terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid or 0.8% to 3% of the total feed mass. When used, the crosslinking agent and the organic metal catalyst are added to the terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid, and mixed evenly to obtain the organosilicon-modified soybean flavonoid adhesive working solution.

[0022] Among them, the cross-linking agent is preferably propyl triacetoxysilane. When it is used as a component of the silicone-modified soybean flavonoid adhesive to prepare the artificial board, the 24h water absorption rate and 24h water absorption thickness expansion rate are lower.

[0023] In some embodiments, in the process of preparing terminal hydroxycarboxyl polydimethylsiloxane modified soybean flavonoids, the molar ratio of terminal hydroxycarboxyl polydimethylsiloxane and epoxy soybean flavonoids is 1: (0.5-1); the phase transfer catalyst is selected from at least one of triethylamine, trioctylmethylammonium chloride, tetramethylammonium bromide, tetrapropylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium iodide, triethylbenzylammonium bromide, triethylhexylammonium bromide, and triethyloctylammonium bromide, and its amount is 1% to 3% of the mass of terminal hydroxycarboxyl polydimethylsiloxane; the organic solvent is selected from at least one of ethyl acetate, acetone, butanone, dimethyl sulfoxide, and dichloromethane.

[0024] In some embodiments, the above-mentioned terminal hydroxycarboxyl polydimethylsiloxane is prepared by the following method: terminal hydroxycarboxyl polydimethylsiloxane, maleic anhydride and a phase transfer catalyst are mixed, and reacted at a temperature of 70 to 85°C for 1 to 5 hours to obtain terminal hydroxycarboxyl polydimethylsiloxane; wherein the molar ratio of terminal hydroxycarboxyl polydimethylsiloxane to maleic anhydride is 1:(1 to 1.2); the phase transfer catalyst is selected from at least one of triethylamine, trioctylmethylammonium chloride, tetramethylammonium bromide, tetrapropylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium iodide, triethylbenzylammonium bromide, triethylhexylammonium bromide and triethyloctylammonium bromide, and its amount is 1% to 3% of the total mass of terminal hydroxycarboxyl polydimethylsiloxane and maleic anhydride.

[0025] The structural formula of the hydroxy-terminated carboxyl-polydimethylsiloxane is as follows, where n represents the degree of polymerization:

[0026]

[0027] In some embodiments, the epoxy soybean flavonoids are prepared by the following method: mixing soybean flavonoids, a modifier, and a phase transfer catalyst, reacting at a temperature of 100 to 110° C. for 1 to 3 hours to obtain a reaction mixture; mixing the reaction mixture, an aqueous sodium hydroxide solution, and an organic solvent, reacting at room temperature for 4 to 6 hours, and separating, purifying, and drying the obtained reaction product to obtain epoxy soybean flavonoids; wherein the modifier is selected from one of epichlorohydrin and epibromohydrin, and the molar ratio of the modifier to soybean flavonoids is (10 to 15): 1; the phase transfer catalyst At least one selected from triethylamine, trioctylmethylammonium chloride, tetramethylammonium bromide, tetrapropylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium iodide, triethylbenzylammonium bromide, triethylhexylammonium bromide, and triethyloctylammonium bromide; the organic solvent is at least one selected from ethyl acetate, acetone, butanone, dimethyl sulfoxide, and dichloromethane; the amount of the phase transfer catalyst is 5% to 8% of the mass of the soybean flavonoids; the concentration of sodium hydroxide in the sodium hydroxide aqueous solution is 45wt% to 55wt%, and the mass ratio of the sodium hydroxide aqueous solution to the soybean flavonoids is (0.8 to 1.5):1.

[0028] In some embodiments, the agricultural waste is in powder or granular form with a mesh size of 60 to 100 meshes.

[0029] In some embodiments, the agricultural waste is corn cob powder and / or rice husk powder, preferably rice husk powder. This is because, compared with corn cob powder, the artificial board prepared with rice husk powder as the base material has a lower thickness expansion rate after absorbing water, which provides a direction for subsequent large-scale market applications.

[0030] According to another aspect of the present invention, a method for preparing the above-mentioned artificial board based on soybean-based adhesive and agricultural waste is provided, when the soybean-based adhesive used is an organosilicon-modified soybean flavone adhesive, comprising the following steps:

[0031] S1. Drying the agricultural waste at a temperature of 60 to 100°C to remove excess water from the raw materials to obtain dry agricultural waste;

[0032] S2. Mix the absolutely dried agricultural waste obtained in step S1 with terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoids, a crosslinking agent, and an organic metal catalyst, spread them flat in a mold and perform a hot pressing process to obtain an artificial board based on a soybean-based adhesive and agricultural waste.

[0033] In some embodiments, in step S2, the hot pressing temperature is 130-150° C., the hot pressing pressure is 12-15 MPa, and the hot pressing time is 10-15 min.

[0034] In some embodiments, the mold is a stainless steel mold with dimensions of 17 cm×17 cm×0.4 cm.

[0035] In some embodiments, in step S1, the agricultural waste is baked at a temperature of 60 to 100° C. for 24 hours until it is completely dry.

[0036] The method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste, when the soybean-based adhesive used is a polymer-modified soybean flavone adhesive, comprises the following steps:

[0037] The agricultural waste is dried at a temperature of 60 to 100°C until it is absolutely dry to remove excess moisture in the raw materials. The absolutely dry agricultural waste obtained is mixed with terminal hydroxycarboxyl compound-modified soybean flavonoids and a curing agent, and then spread flat in a mold for hot pressing to obtain an artificial board based on a soybean-based adhesive and agricultural waste.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The artificial board based on soybean-based adhesive and agricultural waste provided by the present invention uses agricultural waste as a substrate. While taking into account environmental protection and economic benefits, the obtained artificial board has excellent mechanical properties, and the tensile strength reaches up to 22.6MPa, and the 24h water absorption rate is basically lower than the 5% specified in GB / T 24508-2020 foamed wood plastic, and the 24h water absorption thickness expansion rate is also basically lower than the 0.5% specified in the thickness direction of GB / T 24508-2020 foamed wood plastic. In addition, no organic solvent is added to the formula when manufacturing the artificial board, so as to avoid the "foaming" phenomenon of the obtained artificial board, which affects the performance.

[0040] The artificial board prepared by the present invention has good weather resistance, environmental protection performance and bending strength, is suitable for use in a variety of environmental conditions, can significantly reduce the emission of harmful substances, and reduces the felling of forest resources and the pressure on the natural environment by utilizing agricultural waste resources to prepare composite boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the preparation process of the agricultural waste artificial board in the present invention;

[0042] Figure 2 This is the density diagram of the artificial board made of agricultural waste prepared in Examples 1-12 of the present invention;

[0043] Figure 3 This is a 24h water absorption graph of the agricultural waste artificial board prepared in Examples 1-12 of the present invention;

[0044] Figure 4 This is a graph of the 24h water absorption thickness expansion rate of the agricultural waste artificial board prepared in Examples 1-12 of the present invention;

[0045] Figure 5 This is a bending performance diagram of the agricultural waste artificial board prepared in Examples 1-12 of the present invention;

[0046] Figure 6 TG and DTG curves (nitrogen atmosphere) of the agricultural waste artificial board scraps prepared in Examples 1-6 of the present invention;

[0047] Figure 7 TG and DTG curves (nitrogen atmosphere) of the agricultural waste artificial board scraps prepared in Examples 7-12 of the present invention;

[0048] Figure 8 This is a graph showing the tensile strength performance of the agricultural waste artificial board prepared in Examples 1-12 of the present invention;

[0049] Fig. 9 Abaqus software fitting performance diagram of the agricultural waste artificial board prepared in Examples 1, 3, 5, 7, 9 and 11 of the present invention;

[0050] Fig.10 Abaqus software fitting performance diagram of the agricultural waste artificial board prepared in Examples 2, 4, 6, 8, 10 and 12 of the present invention;

[0051] Fig.11 This is a scanning electron microscope image of the impact spline cross section of the agricultural waste artificial board prepared in Examples 1-6 of the present invention;

[0052] Fig.12 This is a scanning electron microscope image of the impact spline cross section of the agricultural waste artificial board prepared in Examples 7-12 of the present invention;

[0053] Fig.13 The synthetic route of the hydroxy-carboxyl-terminated polydimethylsiloxane modified soybean flavonoids of the present invention is as follows;

[0054] Fig.14 The present invention provides a synthetic route for the hydroxy-carboxyl-terminated polybutadiene-modified soybean flavonoids. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below in conjunction with the embodiments. The examples are only for explanation and are not intended to limit the present invention in any way. Unless otherwise specified, the raw materials and reagents used in the examples are conventional products that can be obtained commercially; the experimental methods in the examples where specific conditions are not specified are usually carried out according to conventional conditions in the art or according to the conditions recommended by the manufacturer.

[0056] The term "absolutely dry" as used herein refers to a state in which free water and bound water in agricultural waste have been removed.

[0057] Before implementing the embodiments of the present invention, the soybean-based adhesive required for implementation is first prepared, and then Figure 1 Schematic diagram of the process for preparing artificial boards.

[0058] The preparation of the polymer-modified soybean flavonoid adhesive is roughly carried out according to the method described in Example 1 of Patent 2023117705901, and the specific steps are as follows:

[0059] (1) Add 20 g (0.08 mol) of soybean flask, 1.2 g of tetrabutylammonium bromide, and 74 g (0.8 mol) of epichlorohydrin to a three-necked flask, react at 105° C. for 1 hour, then add 20 g of NaOH solution (50 wt % aqueous solution) and 100 g of dichloromethane as a solvent, react at room temperature for 5 hours, extract with deionized water, filter and wash, and dry in an oven to obtain epoxy soybean flask;

[0060] (2) adding 25 g (about 0.01 mol) of hydroxy-terminated polybutadiene, 0.98 g (0.01 mol) of maleic anhydride, 30 g of ethyl acetate, and 0.25 g of triethylamine to a three-necked flask and reacting them at 100° C. for 2 hours to obtain hydroxy-terminated carboxyl polybutadiene;

[0061] (3) 3.6 g (0.01 mol) of epoxy soybean flavonoids, 0.25 g of triethylamine, and 30 g of ethyl acetate were added to 26 g (about 0.01 mol) of terminal hydroxycarboxyl polybutadiene and reacted at 80° C. for 2 hours to obtain terminal hydroxycarboxyl polybutadiene modified soybean flavonoids;

[0062] (4) The terminal hydroxyl carboxyl polybutadiene modified soybean flavonoids and the curing agent isophorone diisocyanate are packaged separately to obtain a polymer modified soybean flavonoids adhesive.

[0063] It should be noted that, in the embodiments of the present invention, the curing agent may be toluene diisocyanate or phenylmethane diisocyanate in addition to isophorone diisocyanate.

[0064] The preparation of the organosilicon-modified soybean flavone adhesive is roughly carried out according to the method described in Example 1 of Patent 2023117707447, and the specific steps are as follows:

[0065] (1) Add 20 g (0.08 mol) of soybean flask, 1.2 g of tetrabutylammonium bromide, and 74 g (0.8 mol) of epichlorohydrin to a three-necked flask, react at 105° C. for 1 hour, then add 20 g of NaOH solution (50 wt % aqueous solution) and 100 g of dichloromethane as a solvent, react at room temperature for 5 hours, extract with deionized water, filter and wash, and dry in an oven to obtain epoxy soybean flask;

[0066] (2) adding 30 g (0.03 mol) of terminal hydroxyl polydimethylsiloxane, 2.94 g (0.03 mol) of maleic anhydride, and 0.33 g of triethylamine to a three-necked flask and reacting them at 75° C. for 1.5 hours to obtain terminal hydroxyl carboxyl polydimethylsiloxane;

[0067] (3) 5.43 g (0.015 mol) of epoxy soybean flavonoids, 0.36 g of triethylamine, and 30 g of ethyl acetate were added to 31 g (0.03 mol) of terminal hydroxycarboxyl polydimethylsiloxane and reacted at 80° C. for 2 hours to obtain terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoids;

[0068] (4) The terminal hydroxycarboxyl polydimethylsiloxane modified soybean flavonoids, the crosslinking agent methyltrimethoxysilane, the organic metal catalyst dibutyltin dilaurate and ethyl acetate are packaged separately to obtain the organic silicon modified soybean flavonoids adhesive.

[0069] It should be noted that in the embodiments of the present invention, in addition to methyltrimethoxysilane, the crosslinking agent may also be vinyltributylidene silane or propyltriacetoxysilane; in addition, when the organosilicon-modified soybean flavonoid adhesive is selected, it is only composed of terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid, a crosslinking agent, and an organic metal catalyst, and does not contain an organic solvent; when these two adhesives are made into working fluids for the production of the artificial board of the present invention, no water or organic solvent is needed.

[0070] Example 1

[0071] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0072] S1. According to the preparation method of Example 1 of Patent 2023117705901, 79.53 g of terminal hydroxycarboxyl polybutadiene-modified soybean flavonoids and 12.95 g of isophorone diisocyanate (the mass ratio of the two is about 6.14:1) are prepared for use;

[0073] S2. Place 115.6 g corn cob powder in an oven at 80°C for 24 h and dry it to obtain dry corn cob powder;

[0074] S3. Mix absolutely dry corn cob powder, terminal hydroxycarboxyl polybutadiene modified soybean flavonoids and isophorone diisocyanate, spread them evenly in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 130℃, 12MPa, for 10min, and then demold them to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0075] Example 2

[0076] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0077] S1. According to the preparation method of Example 1 of Patent 2023117705901, the polymer-modified soybean flavonoid adhesive is obtained, and 99.42g of terminal hydroxycarboxyl polybutadiene-modified soybean flavonoid and 16.18g of isophorone diisocyanate are taken for use;

[0078] S2. Place 115.6 g of rice husk powder in an oven at 80° C. for 24 h and dry until absolutely dry to obtain absolutely dry rice husk powder;

[0079] S3. Mix the absolutely dry rice husk powder obtained in step S1, the terminal hydroxycarboxyl polybutadiene modified soybean flavonoids and isophorone diisocyanate, spread them evenly in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 150°C, 15MPa, and 15min, and then demold them to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0080] Example 3

[0081] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0082] S1. According to the preparation method of Example 1 of Patent 2023117705901, the polymer-modified soybean flavonoid adhesive is obtained, and 79.53g of terminal hydroxycarboxyl polybutadiene-modified soybean flavonoid and 12.95g of toluene diisocyanate are taken for use;

[0083] S2. Place 115.6 g corn cob powder in an oven at 80°C for 24 h and dry it to obtain dry corn cob powder;

[0084] S3. After the absolutely dried corncob powder, the terminal hydroxyl carboxyl polybutadiene modified soybean flavonoids and toluene diisocyanate were mixed evenly, the mixture was spread in a 17 cm × 17 cm × 0.4 cm stainless steel mold, and the mixture was hot-pressed in a vulcanizer at 130 ° C, 12 MPa, 10 min, and then demolded to obtain a wood-based board based on soybean-based adhesive and agricultural waste;

[0085] Example 4

[0086] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0087] S1. According to the preparation method of Example 1 of Patent 2023117705901, the polymer-modified soybean flavonoid adhesive is obtained, and 99.42g of terminal hydroxycarboxyl polybutadiene-modified soybean flavonoid and 16.18g of toluene diisocyanate are taken for use;

[0088] S2. Place 115.6 g of rice husk powder in an oven at 80° C. for 24 h and dry until absolutely dry to obtain absolutely dry rice husk powder;

[0089] S3. After mixing the absolutely dry rice husk powder, terminal hydroxycarboxyl polybutadiene modified soybean flavonoids and toluene diisocyanate evenly, spread them flat in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 150℃, 15MPa, and 15min, and then demold them after cooling for 30min to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0090] Example 5

[0091] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0092] S1. According to the preparation method of Example 1 of Patent 2023117705901, the polymer-modified soybean flavonoid adhesive is obtained, and 79.53g of terminal hydroxycarboxyl polybutadiene-modified soybean flavonoid and 12.95g of diphenylmethane diisocyanate are taken for use;

[0093] S2. Place 115.6 g corn cob powder in an oven at 80°C for 24 h and dry it to obtain dry corn cob powder;

[0094] S2. After mixing the absolutely dry corn cob powder, terminal hydroxycarboxyl polybutadiene modified soybean flavonoids and diphenylmethane diisocyanate evenly, spread them flat in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 130℃, 12MPa, for 10min, and then cool them for 30min before demolding to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0095] Example 6

[0096] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0097] S1. According to the preparation method of Example 1 of Patent 2023117705901, the polymer-modified soybean flavonoid adhesive is obtained, and 99.42g of terminal hydroxycarboxyl polybutadiene-modified soybean flavonoid and 16.18g of diphenylmethane diisocyanate are taken for use;

[0098] S2. Place 115.6 g of rice husk powder in an oven at 80° C. for 24 h and dry until absolutely dry to obtain absolutely dry rice husk powder;

[0099] S3. After mixing the absolutely dry rice husk powder, terminal hydroxycarboxyl polybutadiene modified soybean flavonoids and diphenylmethane diisocyanate evenly, spread them flat in a 17cm×17cm×0.4cm stainless steel mold, hot press them in a vulcanizer at 150℃, 15MPa, and 15min, and then demold them after cooling for 30min to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0100] Example 7

[0101] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0102] S1. According to the preparation method of Example 1 of Patent 2023117707447, the organosilicon-modified soybean flavonoid adhesive is obtained, and 83.23g of terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid, 9.25g of methyltrimethoxysilane (the mass ratio of the two is 9:1), and 2g of organic metal catalyst dibutyltin dilaurate are taken for use;

[0103] S2. Place 115.6 g corn cob powder in an oven at 80°C for 24 h and dry it to obtain dry corn cob powder;

[0104] S3. After mixing the absolutely dry corn cob powder, end-hydroxycarboxyl polydimethylsiloxane modified soybean flavonoids, methyltrimethoxysilane, and organic metal catalyst dibutyltin dilaurate evenly, spread them flat in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 130℃, 12MPa, and 10min, and then demold them after cooling for 30min to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0105] Example 8

[0106] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0107] S1. According to the preparation method of Example 1 of Patent 2023117707447, the organosilicon-modified soybean flavonoid adhesive is obtained, and 104g of terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid, 11.6g of methyltrimethoxysilane (the mass ratio of the two is about 8.97:1), and 2g of organic metal catalyst dibutyltin dilaurate are taken for use;

[0108] S2. Place 115.6 g of rice husk powder in an oven at 80° C. for 24 h and dry until absolutely dry to obtain absolutely dry rice husk powder;

[0109] S3. After mixing the absolutely dry rice husk powder, end-hydroxycarboxyl polydimethylsiloxane modified soybean flavonoids, methyltrimethoxysilane, and organic metal catalyst dibutyltin dilaurate evenly, spread them flat in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 150℃, 15MPa, and 15min, and then demold them after cooling for 30min to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0110] Example 9

[0111] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0112] S1. According to the preparation method of Example 1 of Patent 2023117707447, the organosilicon-modified soybean flavonoid adhesive is obtained, and 73.98g of terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid, 18.5g of vinyl trisbutyl ketoxime silane (the mass ratio of the two is about 4:1), and 2g of organic metal catalyst dibutyltin dilaurate are taken for later use;

[0113] S2. Place 115.6 g corn cob powder in an oven at 80°C for 24 h and dry it to obtain dry corn cob powder;

[0114] S3. After mixing the absolutely dry corn cob powder, end-hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoids, vinyl trisbutyl ketoxime silane, and organic metal catalyst dibutyl tin dilaurate evenly, spread them flat in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 130℃, 12MPa, and 10min, and then demold them after cooling for 30min to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0115] Example 10

[0116] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0117] S1. According to the preparation method of Example 1 of Patent 2023117707447, 97.1 g of terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid adhesive, 18.5 g of vinyl trisbutyl ketoxime silane (the mass ratio of the two is about 5.25:1), and 2 g of organic metal catalyst dibutyltin dilaurate are taken for later use;

[0118] S2. Place 115.6 g of rice husk powder in an oven at 80° C. for 24 h and dry until absolutely dry to obtain absolutely dry rice husk powder;

[0119] S3. After mixing the absolutely dry rice husk powder, end-hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoids, vinyl trisbutyl ketoxime silane, and organic metal catalyst dibutyl tin dilaurate evenly, spread them flat in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 150℃, 15MPa, and 15min, and then demold them to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0120] Embodiment 11

[0121] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0122] S1. According to the preparation method of Example 1 of Patent 2023117707447, 64.74 g of terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoids, 27.74 g of propyl triacetoxysilane (the mass ratio of the two is about 2.33:1) and 2 g of organic metal catalyst dibutyltin dilaurate are prepared for use;

[0123] S2. Place 115.6 g corn cob powder in an oven at 80°C for 24 h and dry it to obtain dry corn cob powder;

[0124] S3. After mixing the absolutely dry corn cob powder, end-hydroxycarboxyl polydimethylsiloxane modified soybean flavonoids, propyl triacetoxysilane, and organic metal catalyst dibutyltin dilaurate evenly, spread them flat in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 130℃, 12MPa, and 10min, and then demold them after cooling for 30min to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0125] Example 12

[0126] A method for preparing a wood-based board based on a soybean-based adhesive and agricultural waste comprises the following steps:

[0127] S1. According to the preparation method of Example 1 of Patent 2023117707447, the organosilicon-modified soybean flavonoid adhesive is obtained, and 80.92g of terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid, 34.68g of propyl triacetoxysilane (the mass ratio of the two is about 2.33:1), and 2g of organic metal catalyst dibutyltin dilaurate are taken for standby use.

[0128] S2. Place 115.6 g of rice husk powder in an oven at 80° C. for 24 h and dry until absolutely dry to obtain absolutely dry rice husk powder;

[0129] S3. After mixing the absolutely dry rice husk powder, end-hydroxycarboxyl polydimethylsiloxane modified soybean flavonoids, propyl triacetoxysilane, and organic metal catalyst dibutyltin dilaurate evenly, spread them flat in a 17cm×17cm×0.4cm stainless steel mold, and hot press them in a vulcanizer at 150℃, 15MPa, and 15min, and then demold them after cooling for 30min to obtain an artificial board based on soybean-based adhesive and agricultural waste.

[0130] Next, a series of performance test experiments were conducted using the artificial boards based on soybean-based adhesives and agricultural waste prepared in Examples 1 to 12 to explore their performance.

[0131] Experiment 1 Density Test

[0132] The artificial boards prepared in Examples 1-12 were cut into sizes of 5 cm×5 cm×0.4 cm. The weight (m) of each artificial board was weighed, and a certain amount of water was placed in a measuring cylinder, and the volume (v) of the artificial board was measured by the water displacement method. The density of each artificial board was calculated using the density formula ρ=m / v. At least three sets of parallel experiments were performed for each example to ensure the accuracy of the test.

[0133] The results are as follows Figure 2 As shown in (a) and (b), the results show that the density of the agricultural waste wood-based panels prepared by using polymer-modified soybean flavonoid adhesive and silicone-modified soybean flavonoid adhesive is 0.9 g / cm 3 The lowest density is 0.83 g / cm 3 The maximum density of the artificial board in Example 2 is 0.93 g / cm 3 , all exceeding the 0.75g / cm specified in GB / T 24508-2020 3 .

[0134] Experiment 2 24h water absorption test

[0135] This experiment refers to GB / T 24508-2020 foamed wood plastic flooring to test the water absorption rate of Examples 1-12 for 24 hours. The artificial board was cut into a size of 5cm×5cm×0.4cm, and the weight of the test piece (W 0 ) and soak it in water for 24 hours, then take it out and wipe off the surface moisture with a soft cloth. Weigh the mass of the artificial board after absorbing water (W 1 ). At least three sets of parallel experiments were performed for each example to ensure the accuracy of the test.

[0136] The water absorption formula is: W = (W 1 -W 0 ) / W 0

[0137] The results are as follows Figure 3 As shown in (a) and (b), the results show that the 24h water absorption rate of the agricultural waste artificial board prepared by using the polymer-modified soybean flavonoid adhesive in Examples 1 to 6 is lower than 5% specified in GB / T24508-2020 foamed wood-plastic. This is because soybean flavonoids and water are immiscible, the polymers and macromolecules in the silicone are cross-linked with soybean flavonoids, and a large amount of hydroxyl groups in the agricultural waste also react with isocyanates to produce carbamates, which makes the artificial board have a certain hydrophobicity.

[0138] Figure 3 The values ​​of Example 7 and Example 9 in (b) are slightly higher than the 5% specified in GB / T 24508-2020 for foamed wood-plastic composites. This is because the curing agents in the agricultural waste artificial boards prepared using the silicone-modified soybean flavone adhesive are all silanes, which hydrolyze when exposed to water, destroying the silicon-oxygen bonds and increasing the water absorption of the artificial boards.

[0139] Experiment 3 24h water absorption thickness expansion rate test

[0140] Referring to GB / T 24508-2020 foamed wood plastic floor, the 24h water absorption and thickness expansion rate test of Examples 1-12 was carried out. The artificial board was cut into a size of 5cm×5cm×0.4cm, and the thickness (T 0 ) and soaked in water for 24 hours, then taken out and wiped off the surface moisture with a soft cloth, and the thickness of the artificial board after water absorption (T 1 ). At least three sets of parallel experiments were performed for each example to ensure the accuracy of the test.

[0141] The water absorption formula is: T = (T 1 -T 0 ) / T 0 .

[0142] The results are as follows Figure 4 As shown in (a) and (b), the results show that the 24h thickness expansion rate of the agricultural waste wood-based panels prepared by using the polymer-modified soybean flavone adhesive in Examples 1 to 6 is lower than 0.5% specified in the thickness direction of GB / T 24508-2020 foamed wood-plastic. Figure 4(b) Examples 7 and 9 are slightly higher than the 0.5% specified in the thickness direction of GB / T 24508-2020 wood-plastic composites, which corresponds to the water absorption results in Experiment 2. This is because the water-absorbing pores in agricultural waste are filled with water, which causes the volume of the prepared artificial board to expand. Compared with corn cob powder, the expansion rate of the artificial board prepared by rice husk powder is lower, which provides a direction for subsequent large-scale market applications. According to the results of Examples 7 to 12, the higher the interaction between the silane curing agent and the agricultural waste hydroxyl group in the agricultural waste artificial board prepared by the organosilicon-modified soybean flavone adhesive, the better the hydrophobic effect of the corresponding artificial board. This is because the silane in the curing agent limits the hygroscopicity of the artificial board, resulting in a decrease in the water content of the artificial board. The artificial boards hot-pressed by these cross-linking agents help increase the resistance of the artificial board to water exposure. And the characteristics of artificial boards with better mechanical properties are low water absorption and the ability to absorb water vapor in humid air.

[0143] Experiment 4: Bending performance test

[0144] The bending performance test of Examples 1-12 was carried out with reference to GB / T 24508-2020 foamed wood plastic floor. The artificial board was cut into a size of 8 cm × 1.3 cm × 0.4 cm, and the bending performance test of the samples of different examples was carried out using an electronic universal testing machine. The span of the testing machine was set to 64 mm, and the loading speed was set to 5 mm·min -1 At least three parallel experiments were performed for each example to ensure the accuracy of the test. Figure 5 As shown in (a) and (b).

[0145] Figure 5 (a) and (b) show the bending properties of the foamed wood-based panels, among which only Examples 3, 4, 6, and 10 reach and exceed the bending strength requirement of 12 MPa for the foamed wood-plastic floor in GB / T 24508-2020. This is because the hot pressing and temperature in Examples 3, 4, and 6 all meet the conditions for the prepared wood-based panels, and the curing agents MDI (toluene diisocyanate) and TDI (diphenylmethane diisocyanate) have a rigid structure of benzene rings, and the prepared wood-based panels have certain bending resistance. In Example 10, the terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoids and the curing agent form a three-dimensional network structure, so it also has good bending resistance. According to the bending resistance, the optimal raw materials and temperature for preparing the wood-based panels can be determined, thereby ensuring the optimal performance of the prepared wood-based panels.

[0146] Experiment 5 Thermogravimetric test

[0147] The artificial boards prepared in Examples 1-12 were ground with a file to remove a small amount of artificial board debris, and 4-6 mg of the debris was taken into a crucible. The artificial board debris was analyzed by thermogravimetric curve (TG) and thermogravimetric derivative curve (TGA) using a thermal analyzer (Netzsch STA 449C) under a nitrogen atmosphere. The nitrogen flow rate was set to 20 g / min, the test temperature range was 30-700°C, and the heating rate was 10°C / min. The results are shown in Figure 2. Figure 6 (a) and (b), Figure 7 As shown in (a) and (b).

[0148] Figure 6 (a) and (b) show the TG and DTG curves of the artificial board prepared by the polymer modified soybean flavonoid adhesive, which can be divided into two thermal decomposition stages. The first stage is 200-400°C, which is the main stage of weight loss of wood fiber in the artificial board, and the second stage is 400-500°C, which is mainly caused by the decomposition of unstable carbamate. Among them, the group with the largest residual carbon rate is Example 4 and Example 6.

[0149] Figure 7 (a) and (b) show the TG and DTG curves of the artificial board prepared by the organosilicon-modified soybean flavone adhesive, which can be divided into three thermal decomposition stages. The first decomposition stage is within 100°C, which is mainly caused by the weight loss due to the residual moisture in the artificial board; the second stage is 270-300°C, which is the main stage of weight loss of wood fiber in the artificial board, and the third stage is 300-400°C, which is mainly due to the silane curing agent having a siloxy structure, which reacts to form a Si-O-Si structure, increasing the crosslinking density of the system and limiting the relative migration of the molecular chain, thereby improving the overall structural stability of the artificial board. Among them, the residual carbon rates of these six groups are all higher than 50%, and the group with the largest residual carbon rate is Example 10, because silicon elements will form high-temperature resistant silicon dioxide under high temperature conditions, which can promote the formation of more carbon layers.

[0150] Experiment 6: Tensile Strength Test of Artificial Board

[0151] According to GB / T 1040.2-2006 standard, the artificial board was cut into the size of 8cm×1.3cm×0.4cm, and the tensile performance test was carried out using the electronic universal mechanical testing machine WDW1020, and the tensile loading rate of the sample was 10mm / min. At least three sets of parallel experiments were conducted for each example to ensure the accuracy of the test. The results are shown in Figure 1. Figure 8 As shown in (a) and (b).

[0152] Figure 8(a) and (b) show the tensile strength test results of the artificial board prepared by the polymer-modified soy flavonoid adhesive and the artificial board prepared by the organosilicon-modified soy flavonoid adhesive. Among them, the group with the largest tensile strength is Example 4, with a value of 22.6MPa, and the smallest tensile strength is 9.2MPa, corresponding to Example 7. In general, the artificial board prepared by the polymer-modified soy flavonoid adhesive has better tensile strength. This is because the polymer-modified soy flavonoid adhesive enhances the mechanical adhesion of the fiber in the agricultural waste, and can better transfer the load external force to the agricultural waste fiber, thereby improving the tensile properties of the artificial board. The specific surface area of ​​the fiber in the artificial board prepared by the organosilicon-modified soy flavonoid adhesive is small, and the interface bonding between the adhesive and the agricultural waste is poor, so the tensile strength of the prepared artificial board is poor.

[0153] Experiment 7Abaqus software fitting

[0154] Abaqus software was used to establish a 8cm×1.3cm×0.4cm artificial board model, and two material properties of corn cob powder and rice husk powder were assigned to the artificial board model. Polyurethane was added as a bonding material in the artificial board for dynamic fitting analysis. Fig. 9 and 10 shown.

[0155] Fig. 9 and Fig.10 The fitting results in show that the maximum tensile strength of the artificial board made of corn cob powder as the base material (Examples 1, 3, 5, 7, 9, 11) is 6.137MPa, and the maximum tensile strength of the artificial board made of rice husk powder as the base material (Examples 2, 4, 6, 8, 10, 12) is 9.945MPa. Comprehensive experiments 6 to 7 confirm that the artificial boards prepared by the present invention using the two adhesives in the prior art CN117701227 A and CN 117701243A have tensile strengths exceeding the maximum tensile strength of the fitting, and both have good mechanical properties.

[0156] Experiment 8 Scanning electron microscope test

[0157] Use tool pliers to cut and cut the impact spline section of the artificial board of Example 1-12 after the bending performance test (Experiment 4), clamp the section with tweezers and lay it flat on the conductive adhesive, and gently press the two wings with tweezers to ensure that the section is firmly bonded. Then, the processed spline section is gold-sprayed, and the morphology of the fracture interface of the cured adhesive is observed by EVOma15 (ZEISS, Germany) with a voltage of 10.0 kV. The results are shown in Fig.11 and Fig.12 shown.

[0158] Fig.11 and Fig.12The SEM results of the sample fracture surface showed obvious pulled-out fibers and pore structures, and no large pore structures and voids appeared on the fracture surface. The interface bonding was good, indicating that the adhesive had a good bonding degree with the agricultural waste substrate, and the agricultural waste was fully wrapped by the adhesive and tightly bonded. The high strength, good dispersibility and high specific surface area of ​​the fibers in agricultural waste can enhance the physical / mechanical interlocking ability with the adhesive, thereby effectively transferring stress and improving the mechanical properties of the prepared artificial board.

[0159] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A wood-based panel based on soy-based adhesive and agricultural waste, characterized in that It is mainly prepared from agricultural waste and soybean-based adhesive in a mass ratio of 1: (0.8-1), wherein the agricultural waste is in powder or granular form, and the soybean-based adhesive is a polymer-modified soybean flavonoid adhesive or an organosilicon-modified soybean flavonoid adhesive; The polymer modified soybean flavonoid adhesive comprises a terminal hydroxycarboxyl compound modified soybean flavonoid and a curing agent, and the terminal hydroxycarboxyl compound modified soybean flavonoid is prepared by the following method: a terminal hydroxycarboxyl compound, an epoxy soybean flavonoid, a phase transfer catalyst and an organic solvent are mixed and reacted at 75 to 85° C. for 1 to 3 hours to obtain the polymer modified soybean flavonoid adhesive; The organosilicon-modified soybean flavonoid adhesive comprises terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid, a crosslinking agent and an organic metal catalyst. The terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoid is prepared by the following method: terminal hydroxycarboxyl polydimethylsiloxane, epoxy soybean flavonoid, a phase transfer catalyst and an organic solvent are mixed, and reacted at a temperature of 75 to 85° C. for 1 to 3 hours to obtain the adhesive.

2. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 1, characterized in that: The agricultural waste is completely dried agricultural waste that is dried at a temperature of 60 to 100°C.

3. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 1, characterized in that: The terminal hydroxyl carboxyl compound is prepared by the following method: a terminal hydroxyl compound, maleic anhydride, a phase transfer catalyst and an organic solvent are mixed, and the mixture is reacted at 100 to 110° C. for 1 to 3 hours to obtain the compound.

4. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 3, characterized in that: The terminal hydroxy compound is selected from at least one of terminal hydroxy polybutadiene and terminal hydroxy polybutadiene acrylonitrile.

5. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 1, characterized in that: The hydroxy-terminated carboxyl polydimethylsiloxane is prepared by the following method: the hydroxy-terminated polydimethylsiloxane, maleic anhydride and a phase transfer catalyst are mixed and reacted at a temperature of 70 to 85° C. for 1 to 5 hours to obtain the obtained product.

6. The wood-based panel based on soybean-based adhesive and agricultural waste according to any one of claims 1 to 5, characterized in that: The epoxy soybean flavonoids are obtained by the following preparation method: soybean flavonoids, a modifier and a phase transfer catalyst are mixed, and the mixture is reacted at a temperature of 100 to 110° C. for 1 to 3 hours to obtain a reaction mixture; the reaction mixture, a sodium hydroxide aqueous solution and an organic solvent are mixed, and the mixture is reacted at room temperature for 4 to 6 hours, and the obtained reaction product is separated, purified and dried to obtain epoxy soybean flavonoids.

7. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 6, characterized in that The modifier is selected from one of epichlorohydrin and epibromohydrin, and the molar ratio of the modifier to soybean flavonoids is (10-15):

1.

8. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 6, characterized in that: The concentration of sodium hydroxide in the sodium hydroxide aqueous solution is 45wt%-55wt%, and the mass ratio of the sodium hydroxide aqueous solution to soybean flavonoids is (0.8-1.5):

1.

9. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 6, characterized in that The phase transfer catalyst is selected from at least one of triethylamine, trioctylmethylammonium chloride, tetramethylammonium bromide, tetrapropylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium iodide, triethylbenzylammonium bromide, triethylhexylammonium bromide and triethyloctylammonium bromide.

10. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 6, characterized in that: The organic solvent is selected from at least one of ethyl acetate, acetone, butanone, dimethyl sulfoxide and dichloromethane.

11. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 1, characterized in that: The curing agent is selected from any one or more of isophorone diisocyanate, toluene diisocyanate, and diphenylmethane diisocyanate, and the mass ratio of the curing agent to the terminal hydroxyl carboxyl compound modified soybean flavonoid is 1: (5-7).

12. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 1, characterized in that: The crosslinking agent is selected from at least one of methyltrimethoxysilane, vinyltributylonoximesilane and propyltriacetoxysilane, and the mass of the crosslinking agent is 5% to 15% of the mass of the terminal hydroxycarboxyl polydimethylsiloxane modified soybean flavonoids.

13. The wood-based panel based on soybean-based adhesive and agricultural waste according to claim 1, characterized in that: The organic metal catalyst is selected from at least one of dibutyltin dilaurate, stannous isooctanoate, zinc isooctanoate and bismuth isooctanoate, and the mass of the organic metal catalyst is 0.5% to 2.5% of the mass of the terminal hydroxycarboxyl polydimethylsiloxane modified soybean flavonoids or 0.8% to 3% of the total feed mass.

14. The wood-based panel based on soybean-based adhesive and agricultural waste according to any one of claims 7 to 13, characterized in that: The agricultural waste is selected from one or more of corn cob powder, rice husk powder, bagasse, wheat straw powder, corn straw powder, peanut shell powder, bamboo powder, sawdust powder, rice straw powder, and soybean straw powder.

15. The method for preparing a wood-based panel based on a soybean-based adhesive and agricultural waste according to any one of claims 1 to 14, characterized in that: When the soybean-based adhesive used is a polymer-modified soybean flavone adhesive, the method comprises the following steps: S1. Drying the agricultural waste at a temperature of 60 to 100° C. to obtain absolutely dry agricultural waste; S2. Mix the absolutely dried agricultural waste obtained in step S1, the terminal hydroxycarboxyl compound modified soybean flavonoids, and a curing agent, spread them flat in a mold and perform a hot pressing process to obtain an artificial board based on a soybean-based adhesive and agricultural waste.

16. The method for preparing a wood-based panel based on a soybean-based adhesive and agricultural waste according to any one of claims 1 to 15, characterized in that: When the soybean-based adhesive used is a silicone-modified soybean flavone adhesive, the method comprises the following steps: S1. Drying the agricultural waste at a temperature of 60 to 100° C. to obtain absolutely dry agricultural waste; S2. Mix the absolutely dried agricultural waste obtained in step S1 with terminal hydroxycarboxyl polydimethylsiloxane-modified soybean flavonoids, a crosslinking agent, and an organic metal catalyst, spread them flat in a mold and perform a hot pressing process to obtain an artificial board based on a soybean-based adhesive and agricultural waste.

17. The preparation method according to claim 15 or 16, characterized in that: In step S2, the hot pressing temperature is 130-150° C., the hot pressing pressure is 12-15 MPa, and the hot pressing time is 10-15 min.

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