Preparation method of high-strength, tough, water-resistant and recyclable functional reconstituted wood

Abstract

The present invention discloses a method for preparing high-strength, tough, water-resistant, recyclable functional reconstituted wood. Sodium hypochlorite and acetic acid are used to delignify natural wood to obtain delignified wood. Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, a catalyst, and a good solvent are mixed and reacted in a certain mass ratio to prepare a bifunctional macromonomer. Then, the bifunctional macromonomer is mixed with lauryl methacrylate in a certain mass ratio to prepare a reaction system, and then a good solvent and an initiator in a certain mass ratio are added. The delignified wood is immersed in the reaction system for reduced pressure impregnation, and after impregnation, thermal initiation is performed to obtain functional reconstituted wood. The present invention can simply and efficiently prepare functional reconstituted wood with hindered urea bonds. The functional reconstituted wood not only has high strength, toughness, water resistance, and recyclability, but can also be used for tribo-nanogenerators to collect mechanical energy in the environment.

Description

Technical Field

[0001] The invention relates to a preparation method of high-strength, water-resistant and recyclable functional reconstituted wood, belonging to the technical field of wood processing. Background Art

[0002] In recent years, the rapid growth of global energy demand and the overexploitation of non-renewable fossil resources such as oil, coal, and natural gas have led to serious energy crises and ecological and environmental problems. Therefore, the search for green and renewable energy is an urgent need for sustainable social development. Triboelectric nanogenerators (TENGs) have become an extremely important new energy collection method in today's society due to their advantages such as high energy conversion efficiency, flexible design, and low manufacturing cost. However, most materials used in TENGs are usually difficult to degrade metals and polymer synthetic materials, which seriously hinders the further development of cost-effective and environmentally friendly TENGs. Wood, as a natural organic polymer composite material, is not only low-cost, abundant, and renewable, but also has a unique hierarchical porous structure, excellent mechanical strength, good processability, and controllable surface chemical properties. It is an excellent candidate material for the preparation of sustainable electronic devices. However, the inherent characteristics of wood, such as opacity, water resistance, and low toughness, limit its large-scale application. Therefore, by rationalizing the structural design and functional modification of wood to improve its mechanical properties, giving it hydrophobic and recyclable properties, and developing new wood materials with excellent performance and diverse functions, not only can the high-value utilization of forest biomass resources be achieved, but it is also of great significance to the further development of sustainable flexible friction nanogenerators. Summary of the Invention

[0003] Purpose of the invention: In order to solve the inherent water resistance and low toughness of wood, the present invention provides a method for preparing high-strength, tough, water-resistant and recyclable functional reconstituted wood.

[0004] Technical solution: To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A method for preparing high-strength, tough, water-resistant, recyclable functional reconstituted wood comprises the following steps:

[0006] Step 1: delignify natural wood using sodium hypochlorite and acetic acid, react at 30-50° C. for 24-72 hours until the wood turns white, wash with deionized water 3-5 times to remove excess chemical reagents, and freeze-dry to obtain delignified wood.

[0007] Step 2: Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, a catalyst, and a good solvent are mixed in a certain mass ratio and reacted at 40-60° C. for 1-3 hours to prepare a bifunctional macromonomer. Next, the bifunctional macromonomer and lauryl methacrylate are mixed in a certain mass ratio to prepare a reaction system, which is stirred at room temperature for 0.5-2 hours. The reaction system is then mixed with a good solvent and an initiator in a certain mass ratio and stirred for 5-30 minutes to ensure uniform mixing.

[0008] Step 3: immerse the delignified wood in the reaction system and perform reduced pressure immersion at room temperature for 0.5 to 3 hours.

[0009] Step 4: thermally initiating the impregnated wood at 70-90° C. and 5-10 MPa for 5-20 minutes to obtain the functional reconstructed wood.

[0010] Preferably, the natural wood contains at least any one of balsa, poplar, basswood, pine and fir.

[0011] Preferably, the mass fraction of the sodium hypochlorite is 1-5 wt %, and the mass fraction of the acetic acid is 2-5 wt %.

[0012] Preferably, the mass ratio of the hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, catalyst, and good solvent is 1:1-1.5:0.005-0.01:0.2-0.5.

[0013] Preferably, the mass ratio of the bifunctional macromonomer to lauryl methacrylate is 1:0.2-1.5.

[0014] Preferably, the mass ratio of the reaction system, initiator and good solvent is 1:0.01-0.05:0.1-0.3.

[0015] Preferably, the catalyst is any one of dibutyltin dilaurate, 4-dimethylaminopyridine, and triethylamine, or a combination of two or more thereof.

[0016] Preferably, the initiator is any one of azobisisobutyronitrile, dibenzoyl peroxide, and ammonium persulfate, or a combination of two or more thereof.

[0017] Preferably, the good solvent is any one of N,N-dimethylformamide, dimethyl sulfoxide, dichloromethane, tetrahydrofuran, or a combination of two or more thereof.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The functional recombinant wood modified by synergistic modification of hindered urea bonds and free radical polymerization can significantly improve the mechanical toughness, water resistance and recyclability of the wood, and the performance of the recombinant wood can be effectively regulated by changing the ratio of the bifunctional macromolecular monomer to lauryl methacrylate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the infrared spectrum of the functional reconstituted wood in Example 1.

[0021] Figure 2 This is the contact angle diagram of the functional reconstructed wood in Example 1.

[0022] Figure 3 1 is the monotonic tensile stress-strain curve of the functional reconstituted wood in Example 1 before and after recycling. DETAILED DESCRIPTION

[0023] The present invention is further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0024] Example 1

[0025] A method for preparing high-strength, tough, water-resistant, recyclable functional reconstituted wood. In this embodiment, balsa wood is used to prepare the functional reconstituted wood, and the method specifically includes the following steps:

[0026] Step 1: Delignify natural wood using sodium hypochlorite and acetic acid at 40°C for 72 hours to obtain delignified wood. The wood is then washed four times with deionized water to remove excess chemical reagents and freeze-dried to obtain the delignified wood. The mass fraction of the sodium hypochlorite is 3 wt%, and the mass fraction of the acetic acid is 3 wt%.

[0027] Step 2: Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, dibutyltin dilaurate, and dichloromethane were added to a round-bottom flask at a mass ratio of [hexamethylene diisocyanate]:[2-(tert-butylamino)ethyl methacrylate]:[dibutyltin dilaurate]:[dichloromethane]=1:1.06:0.01:0.44, and reacted at 50°C for 1.5 hours to prepare a bifunctional macromonomer. Subsequently, the bifunctional macromonomer and lauryl methacrylate were prepared into a reaction system at a mass ratio of [bifunctional macromonomer]:[lauryl methacrylate]=1:1 and stirred at room temperature for 30 minutes. Azobisisobutyronitrile and dichloromethane were then added to the reaction system at a mass ratio of [reaction system]:[azobisisobutyronitrile]:[dichloromethane]=1:0.03:0.2, and the mixture was stirred for 10 minutes to mix uniformly.

[0028] First, hexamethylene diisocyanate reacts with 2-(tert-butylamino)ethyl methacrylate to prepare a bifunctional macromolecule with both isocyanate and acrylate groups. Under thermal initiation, free radical polymerization occurs between the bifunctional macromolecule and lauryl methacrylate to form a linear polymer with hindered urea bonds. Simultaneously, the isocyanate groups in the linear polymer react with the active hydroxyl groups on the surface of delignified wood via a polyaddition reaction to produce functional reconstituted wood.

[0029] Reaction equation of hexamethylene diisocyanate and 2-(tert-butylamino)ethyl methacrylate (polyaddition reaction)

[0030]

[0031] Step 3: Add the delignified wood into the reaction system and impregnate it under reduced pressure for 1 hour.

[0032] Step 4: thermally initiate the impregnated wood at 80° C. and 5 MPa for 15 minutes to obtain functional reconstituted wood.

[0033] Reaction equation between bifunctional macromer, lauryl methacrylate, and delignified wood (the bifunctional macromer and lauryl methacrylate form a linear polymer through free radical polymerization, and the isocyanate groups in the linear polymer react with the active hydroxyl groups in the delignified wood cellulose through polyaddition reaction to prepare functional reconstituted wood)

[0034]

[0035] The structural formula of functional reconstructed wood:

[0036]

[0037] Example 2

[0038] The difference between this embodiment and embodiment 1 is:

[0039] Step 1: Delignify natural wood using sodium hypochlorite and acetic acid at 30°C for 60 hours to obtain delignified wood. The wood is then washed five times with deionized water to remove excess chemical reagents and freeze-dried to obtain the delignified wood. The mass fraction of the sodium hypochlorite is 5 wt%, and the mass fraction of the acetic acid is 1 wt%.

[0040] Step 2: Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, dibutyltin dilaurate, and dichloromethane were added to a round-bottom flask at a mass ratio of [hexamethylene diisocyanate]: [2-(tert-butylamino)ethyl methacrylate]: [dibutyltin dilaurate]: [dichloromethane] = 1:1.5:0.005:0.5, and reacted at 40°C for 3 hours to prepare a bifunctional macromonomer. Then, the bifunctional macromonomer and lauryl methacrylate were added at a mass ratio of [bifunctional macromonomer]: [lauryl methacrylate] = 1:0.2 to prepare a reaction system and stirred at room temperature for 2 hours. Then, azobisisobutyronitrile and dichloromethane were added to the reaction system at a mass ratio of [reaction system]: [azobisisobutyronitrile]: [dichloromethane] = 1:0.01:0.3 and stirred for 5 minutes to mix evenly.

[0041] Step 3: Add the delignified wood into the reaction system and impregnate it under reduced pressure for 0.5 h.

[0042] Step 4: thermally initiating the impregnated wood at 70° C. and 10 MPa for 5 minutes to obtain functional reconstructed wood.

[0043] Example 3

[0044] The difference between this embodiment and embodiment 1 is:

[0045] Step 1: Delignify natural wood using sodium hypochlorite and acetic acid at 50°C for 24 hours to obtain delignified wood. The wood is then washed five times with deionized water to remove excess chemical reagents and freeze-dried to obtain the delignified wood. The mass fraction of the sodium hypochlorite is 1 wt%, and the mass fraction of the acetic acid is 5 wt%.

[0046] Step 2: Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, dibutyltin dilaurate, and dichloromethane were added to a round-bottom flask at a mass ratio of [hexamethylene diisocyanate]:[2-(tert-butylamino)ethyl methacrylate]:[dibutyltin dilaurate]:[dichloromethane]=1:1:0.01:0.2, and reacted at 60°C for 1 hour to prepare a bifunctional macromonomer. Subsequently, the bifunctional macromonomer and lauryl methacrylate were added at a mass ratio of [bifunctional macromonomer]:[lauryl methacrylate]=1:1.5 to prepare a reaction system and stirred at room temperature for 0.5 hour. Azobisisobutyronitrile and dichloromethane were then added to the reaction system at a mass ratio of [reaction system]:[azobisisobutyronitrile]:[dichloromethane]=1:0.05:0.1 and stirred for 30 minutes to mix uniformly.

[0047] Step 3: Add the delignified wood into the reaction system and impregnate it under reduced pressure for 3 hours.

[0048] Step 4: thermally initiate the impregnated wood at 90° C. and 7 MPa for 20 minutes to obtain functional reconstructed wood.

[0049] Example 4

[0050] In this embodiment, poplar wood is used to prepare functionalized wood, and the preparation method includes the following steps:

[0051] Natural wood was delignified using sodium hypochlorite and acetic acid, and the reaction was carried out at 50°C for 48 hours to obtain delignified wood. Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, 4-dimethylaminopyridine, and tetrahydrofuran were added to a round-bottom flask at a mass ratio of [hexamethylene diisocyanate]:[2-(tert-butylamino)ethyl methacrylate]:[4-dimethylaminopyridine]:[tetrahydrofuran] = 1:1.2:0.008:0.3, and the mixture was reacted at 40°C for 3 hours to prepare a bifunctional macromonomer. Then, a reaction system was prepared by mixing a difunctional macromonomer and lauryl methacrylate in a mass ratio of [difunctional macromonomer]:[lauryl methacrylate]=1:0.3 and stirring at room temperature for 20 minutes. Then, ammonium persulfate and tetrahydrofuran were added to the reaction system in a mass ratio of [reaction system]:[ammonium persulfate]:[tetrahydrofuran]=1:0.04:0.2, and the mixture was stirred for 20 minutes to ensure uniform mixing.

[0052] Delignified wood was added into the reaction system and impregnated under reduced pressure for 1 hour, and then hot pressed at 70°C and 10 MPa for 20 minutes to obtain functional reconstituted wood.

[0053] Example 5

[0054] In this embodiment, basswood is used to prepare functionalized wood, and the preparation method includes the following steps:

[0055] Natural wood was delignified using sodium hypochlorite and acetic acid, and the reaction was carried out at 45°C for 55 hours to obtain delignified wood. Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, triethylamine, and N,N-dimethylformamide were added to a round-bottom flask at a mass ratio of [hexamethylene diisocyanate]:[2-(tert-butylamino)ethyl methacrylate]:[triethylamine]:[N,N-dimethylformamide] = 1:1.3:0.01:0.4, and the mixture was reacted at 60°C for 1 hour to prepare a bifunctional macromonomer. Then, a reaction system was prepared by combining a difunctional macromonomer and lauryl methacrylate at a mass ratio of [difunctional macromonomer]:[lauryl methacrylate] = 1:0.5 and stirred at room temperature for 30 minutes. Then, dibenzoyl peroxide and N,N-dimethylformamide were added to the reaction system at a mass ratio of [reaction system]:[dibenzoyl peroxide]:[N,N-dimethylformamide] = 1:0.02:0.2, and the mixture was stirred for 20 minutes to ensure uniform mixing.

[0056] Delignified wood was added into the reaction system and impregnated under reduced pressure for 1.5 h. After that, the system was hot pressed at 70° C. and 10 MPa for 20 min to obtain functional reconstituted wood.

[0057] Example 6

[0058] In this embodiment, balsa wood is used to prepare functionalized wood, and the preparation method includes the following steps:

[0059] Natural wood was delignified using sodium hypochlorite and acetic acid and reacted at 50°C for 24 hours to obtain delignified wood. Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, dibutyltin dilaurate, and N,N-dimethylformamide were added to a round-bottom flask at a mass ratio of [hexamethylene diisocyanate]:[2-(tert-butylamino)ethyl methacrylate]:[dibutyltin dilaurate]:[N,N-dimethylformamide] = 1:1.5:0.005:0.4 and reacted at 55°C for 1 hour to prepare a bifunctional macromonomer. Then, a reaction system was prepared by combining a difunctional macromonomer and lauryl methacrylate at a mass ratio of [difunctional macromonomer]:[lauryl methacrylate] = 1:0.8 and stirred at room temperature for 1 hour. Then, ammonium persulfate and N,N-dimethylformamide were added to the reaction system at a mass ratio of [reaction system]:[ammonium persulfate]:[N,N-dimethylformamide] = 1:0.05:0.3, and the mixture was stirred for 10 minutes to ensure uniform mixing.

[0060] Delignified wood was added into the reaction system and impregnated under reduced pressure for 0.5 h, and then hot pressed at 90° C. and 5 MPa for 10 min to obtain functional reconstituted wood.

[0061] Example 7

[0062] In this embodiment, functionalized wood is prepared using Chinese fir, and the preparation method includes the following steps:

[0063] Natural wood was delignified using sodium hypochlorite and acetic acid, and the reaction was continued at 45°C for 50 hours to obtain delignified wood. Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, and triethylamine were added to a round-bottom flask at a mass ratio of [hexamethylene diisocyanate]:[2-(tert-butylamino)ethyl methacrylate]:[triethylamine] = 1:1:0.15. The mixture was reacted at 45°C for 2 hours to prepare a difunctional macromonomer. The difunctional macromonomer and lauryl methacrylate were then prepared in a mass ratio of [difunctional macromonomer]:[lauryl methacrylate] = 1:1.3 to form a reaction system. The reaction system was stirred at room temperature for 0.5 hours. Dibenzoyl peroxide and dimethyl sulfoxide were then added to the reaction system at a mass ratio of [reaction system]:[dibenzoyl peroxide]:[dimethyl sulfoxide] = 1:0.03:0.5 and stirred for 10 minutes to ensure uniform mixing.

[0064] Delignified wood was added into the reaction system and impregnated under reduced pressure for 0.5 h, and then hot pressed at 85° C. and 10 MPa for 10 min to obtain functional reconstituted wood.

[0065] Example 8

[0066] In this embodiment, pine wood is used to prepare functionalized wood, and the preparation method includes the following steps:

[0067] Natural wood was delignified using sodium hypochlorite and acetic acid, and the reaction was carried out at 40°C for 60 hours to obtain delignified wood. Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, 4-dimethylaminopyridine, and dichloromethane were added to a round-bottom flask at a mass ratio of [hexamethylene diisocyanate]:[2-(tert-butylamino)ethyl methacrylate]:[4-dimethylaminopyridine]:[dichloromethane] = 1:1.4:0.008:0.2, and the mixture was reacted at 50°C for 2 hours to prepare a bifunctional macromonomer. Then, a reaction system was prepared by mixing a difunctional macromonomer and lauryl methacrylate in a mass ratio of [difunctional macromonomer]:[lauryl methacrylate]=1:1.5 and stirred at room temperature for 0.5 h. Then, azobisisobutyronitrile and dichloromethane were added to the reaction system in a mass ratio of [reaction system]:[dibenzoyl peroxide]:[dichloromethane]=1:0.03:0.3, and the mixture was stirred for 15 min to ensure uniform mixing.

[0068] Delignified wood was added into the reaction system and impregnated under reduced pressure for 1 hour, and then hot pressed at 90°C and 10 MPa for 10 minutes to obtain functional reconstituted wood.

[0069] Example 9

[0070] In this embodiment, balsa wood is used to prepare functionalized wood, and the preparation method includes the following steps:

[0071] Natural wood was delignified using sodium hypochlorite and acetic acid, and the reaction was carried out at 45°C for 48 hours to obtain delignified wood. Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, dibutyltin dilaurate, and tetrahydrofuran were added to a round-bottom flask at a mass ratio of [hexamethylene diisocyanate]:[2-(tert-butylamino)ethyl methacrylate]:[dibutyltin dilaurate]:[tetrahydrofuran] = 1:1.5:0.006:0.3, and the mixture was reacted at 45°C for 1 hour to prepare a bifunctional macromonomer. Then, a reaction system was prepared by mixing a difunctional macromonomer and lauryl methacrylate in a mass ratio of [difunctional macromonomer]:[lauryl methacrylate]=1:1 and stirred at room temperature for 0.5 h. Then, ammonium persulfate and tetrahydrofuran were added to the reaction system in a mass ratio of [reaction system]:[ammonium persulfate]:[tetrahydrofuran]=1:0.02:0.3, and the mixture was stirred for 15 min to ensure uniform mixing.

[0072] Delignified wood was added into the reaction system and impregnated under reduced pressure for 2 h, and then hot pressed at 75 °C and 10 MPa for 15 min to obtain functional reconstituted wood.

[0073] like Figure 1 The following is the spectrum of the functional reconstituted wood in Example 1: 1573 cm -1 The stretching vibration peak of -C=O- corresponding to the urea bond and 1462 cm -1 The appearance of the stretching vibration peak corresponding to the -CN- bond at , proves the successful preparation of functional reconstructed wood.

[0074] like Figure 2 As shown, this is a contact angle diagram of the functional recombinant wood in Example 1: the contact angle of the functionalized wood is 94.1°, indicating that it has excellent water resistance.

[0075] like Figure 3 As shown in the figure, the monotonic tensile stress-strain curve of the functional reconstituted wood in Example 1 before and after recycling is shown: It can be seen from the figure that the functionalized wood has good mechanical properties, with a mechanical strength of 41.2 MPa, an elongation at break of 18.9%, and a toughness of 3.38 MJ / m 3 The recycled wood still has good mechanical properties, with a mechanical strength of 15.6MPa, an elongation at break of 16.0%, and a toughness of 1.77MJ / m 3 .

[0076] Tests revealed that the functional reconstituted wood produced in Examples 1-9 exhibited excellent mechanical properties, water resistance, and recyclability, demonstrating significant application value in flexible triboelectric nanogenerators and multifunctional electronic devices. This method allows for the simple and efficient preparation of functional reconstituted wood with hindered urea bonds. These wood exhibits high strength, water resistance, and recyclability, and can also be used in triboelectric nanogenerators to harvest mechanical energy from the environment.

[0077] The preparation method of the high-strength, tough, water-resistant, recyclable functional reconstituted wood involved in the present invention is simple, efficient and sustainable. The high-strength, tough, water-resistant, recyclable functional reconstituted wood involved in the present invention is a new type of flexible wood-based material. It has important application value in the field of flexible friction nanogenerators and multifunctional electronic devices. It is of great significance to further improve the high-value utilization of wood and can further expand the application range of wood.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing high-strength, tough, water-resistant, recyclable functional reconstituted wood, characterized in that: The following steps are involved: Step 1: delignify natural wood using sodium hypochlorite and acetic acid at 30-50°C for 24-72 hours until the wood turns white, wash with deionized water 3-5 times to remove excess chemical reagents, and freeze-dry to obtain delignified wood; Step 2: Hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, a catalyst, and a good solvent are mixed in a certain mass ratio, wherein the mass ratio of hexamethylene diisocyanate, 2-(tert-butylamino)ethyl methacrylate, the catalyst, and the good solvent is 1:1-1.5:0.005-0.01:0.2-0.5, and reacted at 40-60° C. for 1-3 hours to prepare a bifunctional macromonomer; then, the bifunctional macromonomer and lauryl methacrylate are prepared into a reaction system in a certain mass ratio and stirred at room temperature for 0.5-2 hours, and then mixed with a good solvent and an initiator in a certain mass ratio and stirred for 5-30 minutes to mix them evenly; Step 3, immersing the delignified wood in the reaction system and performing reduced pressure immersion at room temperature for 0.5 to 3 hours; Step 4: thermally initiating the impregnated wood at 70-90° C. and 5-10 MPa for 5-20 minutes to obtain the functional reconstructed wood.

2. The method for preparing the high-strength, tough, water-resistant, recyclable functional reconstituted wood according to claim 1, characterized in that: The natural wood contains at least any one of balsa, poplar, basswood, pine and fir.

3. The method for preparing the high-strength, tough, water-resistant, recyclable functional reconstituted wood according to claim 2, characterized in that: The mass fraction of the sodium hypochlorite is 1-5 wt %, and the mass fraction of the acetic acid is 2-5 wt %.

4. The method for preparing the high-strength, tough, water-resistant, recyclable functional reconstituted wood according to claim 3, characterized in that: The mass ratio of the bifunctional macromonomer to lauryl methacrylate is 1:0.2 to 1:

5.

5. The method for preparing the high-strength, tough, water-resistant, recyclable functional reconstituted wood according to claim 4, characterized in that: The mass ratio of the reaction system, initiator and good solvent is 1:0.01-0.05:0.1-0.

3.

6. The method for preparing the high-strength, tough, water-resistant, recyclable functional reconstituted wood according to claim 5, characterized in that: The catalyst is any one of dibutyltin dilaurate, 4-dimethylaminopyridine and triethylamine, or a combination of two or more thereof.

7. The method for preparing the high-strength, tough, water-resistant, recyclable functional reconstituted wood according to claim 6, characterized in that: The initiator is any one of azobisisobutyronitrile, dibenzoyl peroxide, and ammonium persulfate, or a combination of two or more thereof.

8. The method for preparing the high-strength, tough, water-resistant, recyclable functional reconstituted wood according to claim 7, characterized in that: The good solvent is any one of N,N-dimethylformamide, dimethyl sulfoxide, dichloromethane, and tetrahydrofuran, or a combination of two or more thereof.

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