Structure reconstruction type resin wood and preparation method thereof

Abstract

The invention discloses structure reconstruction type resin wood and a preparation method thereof. The preparation method comprises the following steps that wood with a certain water content is subjected to intermittent microwave treatment with specific energy density, a high-density compressed wood tissue structure and a crack cavity structure are constructed in the wood, and a structure reconstruction type wood base material is obtained; and after the moisture content of the wood base material is regulated and controlled, the crack cavity structure of the base material is filled with low-viscosity thermosetting resin through a vacuum impregnation method, curing is conducted, and the structure reconstruction type resin wood is obtained. The internal structure of the wood forms a stable and uniform wood skeleton with compressed density through two times of intermittent microwave treatment, and after entering, a large amount of resin is filled in an internal crack cavity structure to form an obvious interface structure with the wood skeleton. The prepared resin wood is uniform in wood unit density distribution, has excellent mechanical properties while retaining the pore structure of the wood, and is suitable for building structure materials and high-performance wood products.

Description

Technical Field

[0001] This invention relates to the field of wood functional improvement technology, specifically to a structurally reconstructed resin wood and its preparation method. Background Technology

[0002] Low-quality wood generally suffers from low density and poor mechanical properties, hindering the widespread production and application of wood products. Functional modification of wood can improve its properties, such as by combining it with high-performance resin materials. However, existing wood-resin composite materials face numerous challenges, including high processing costs and complex processes. Therefore, improving low-quality wood and developing a novel composite material that combines the advantages of both wood and resin is of paramount importance.

[0003] Microwaves possess excellent penetrability, enabling rapid vaporization and release of internal moisture in wood for quick drying, while simultaneously eliminating internal stress. Thermosetting resins, commonly used wood modifiers, are frequently employed in wood impregnation and reinforcement, as well as in the production of engineered wood products. Combining these resins with microwave technology to improve wood can lead to the development of high-performance and high-value-added wood products. Chinese invention patent CN 107160510 A discloses a microwave-impregnation modification process for solid wood flooring. This invention effectively improves permeability, thereby increasing the impregnation drug loading and dimensional stability of the flooring material. However, this method requires multi-gradient adjustment of the microwave and impregnation processes, demanding high precision in parameter control, and its complex process results in high preparation costs. Chinese invention patent CN 111086077 A discloses a method for preparing resin-filled microwave-expanded wood. This method relies on external mechanical devices to complete resin degassing and wood impregnation step by step, making the operation complex. Furthermore, the resin used has extremely high viscosity (above 3000 mPa·s), which can only fill macroscopic cracks, limiting performance improvement. Summary of the Invention

[0004] To address the aforementioned shortcomings in the existing technology, the present invention aims to provide a structurally reconstructed resin wood and its preparation method. The method achieves structural reconstruction of wood tissue through intermittent microwave treatment, and together with low-viscosity resin (100-500 mPa·s), it realizes efficient filling and synergistic enhancement of the resin in macroscopic cracks and wood pores. The process is simpler, the production efficiency is higher, and the material properties are better.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: On the one hand, a method for preparing structurally reconstructed resin wood is provided, which includes the following steps: Wood with a moisture content of 20%~80% is processed to achieve an energy density of 60~150 kWh / m³. 3Intermittent microwave treatment creates a high-density compressed wood tissue structure and crack cavity structure inside the wood, resulting in a structurally reconstructed wood substrate. After adjusting the moisture content of the wood substrate to 5%~12%, a low-viscosity thermosetting resin of 100~500mPa·s is filled into the crack cavity structure of the wood substrate by vacuum impregnation and cured, thus obtaining structurally reconstructed resin wood.

[0006] Specifically, the following steps are included: (1) Adjust the overall moisture content of the wood: Adjust the overall moisture content of the wood to 20%~80% by soaking and / or drying; during the adjustment of the overall moisture content of the wood, the deviation of the internal moisture content of the wood is less than 5%.

[0007] (2) Single microwave treatment: The wood is subjected to microwave radiation treatment with a microwave energy density of 60~150kWh / m³. 3 The wood is removed and water vapor is released, causing cracks to form inside the wood, resulting in a wood substrate for structural reconstruction stage 1. (3) Two microwave treatments: After the first microwave treatment, microwave treatment with the same energy density is performed again after an interval of 5 to 20 minutes. The internal structure of the wood is compressed, and the cracks expand to both sides into macro cracks, resulting in a wood substrate with two stages of structural reconstruction. (4) Prepare thermosetting resin: The resin viscosity is controlled at 100~500mPa·s, and the construction time is not less than 60min; (5) Wood substrate impregnation with resin: The moisture content of the structurally reconstructed wood substrate is controlled at 5%~12%; the wood substrate is impregnated with resin so that the resin liquid level is higher than the upper surface of the wood substrate. (6) Vacuum impregnation: Set a vacuum environment of -0.05~-0.1MPa and impregnate for 10~60min to allow the air inside the wood to slowly escape. From vacuuming to maintaining pressure and then releasing pressure to atmospheric pressure, vacuum once; vacuum 1~3 times. After releasing pressure, cure at a temperature of 10~100℃ and atmospheric pressure for 1~72h to obtain structurally reconstructed resin wood.

[0008] Furthermore, in steps (2) and (3), the equipment used for microwave treatment is either a tunnel-type microwave treatment device or a box-type microwave treatment device. The parameters that need to be adjusted for the tunnel-type microwave treatment device include the volume of wood irradiated by microwaves, the wood transmission speed, and the microwave power of the device. The parameters that need to be adjusted for the box-type microwave treatment device include the volume of wood irradiated by microwaves, the microwave power of the device, and the microwave irradiation time of the wood, so as to meet the requirements of a microwave energy density of 60~150kWh / m³. 3 The microwave energy density deviation is less than 1%.

[0009] Furthermore, in steps (2) and (3), the microwave frequency of the microwave radiation treatment is 0.1~24GHz, the microwave power is 20~250kW, and the microwave treatment time is 20~240s.

[0010] Furthermore, the microwave frequency for microwave radiation treatment is 915MHz, the microwave power is 60~200kW, and the microwave treatment time is 30~200s.

[0011] Furthermore, the interval after removing the wood from the microwave device should be adjusted appropriately according to the size of the wood to fully release moisture and maintain temperature; the preferred interval is 5 to 15 minutes.

[0012] Furthermore, in step (4), the thermosetting resin includes epoxy resin, unsaturated polyester resin or phenolic resin.

[0013] Furthermore, the thermosetting resin is an epoxy resin system, including epoxy resin, curing agent and resin modifier.

[0014] Furthermore, the resin modifiers include aluminum hydroxide and 2-ethylhexyl glycidyl ether.

[0015] Further, in step (5), 20 to 100 parts of resin are added per 100 parts by weight of wood substrate.

[0016] Further, in step (5), the resin liquid level is made to be more than 5 mm above the upper surface of the wood substrate. Depending on the immersion of the wood substrate in the resin, 1 to 5 parts of resin are added or removed for every 100 parts of wood substrate by weight. If necessary, counterweights can be applied to the wood substrate to ensure that it is completely submerged below the resin liquid level.

[0017] Furthermore, the wood used can be one or more of coniferous or broadleaf wood; and / or, the wood can be one or more of logs, logs, sawn timber, and boards, with sawn timber preferably being whole-edge sawn timber, and boards can be radially cut boards, tangentially cut boards, and boards with any angle between radial and tangential directions.

[0018] Furthermore, the length of the timber used is 50-200cm, the width is 5-20cm, and the thickness is 3-12cm.

[0019] On the other hand, a structurally reconstructed resin-wood prepared according to the above-described method is provided, which contains a three-dimensional network structure composed of high-density compressed wood tissue and crack cavities filled with thermosetting resin; its density is 0.5~1.5 g / cm³, hardness is 3000~13000 N, bending strength is 50~200 MPa, and impact toughness is 50~150 kJ / m. 2 .

[0020] The beneficial effects of this invention are as follows: (1) This invention uses high-energy microwave treatment on wood, adjusting the microwave energy density to 60~150kWh / m³. 3 Through intermittent release of water vapor and secondary microwave treatment, a large number of cracks, tissue compression and crack propagation are successively generated in the wood, making the wood substrate preparation process efficient and rapid. Compared with untreated wood, the structurally reconstructed wood substrate produces uniformly distributed crack cavities and high-density compressed tissue. The tissue structure is reconstructed, and the high-density compressed tissue area is manifested as a darker wood color and clearer wood texture, providing a material basis for secondary composite processing.

[0021] (2) The resin wood obtained by the secondary composite processing of the structural reconstructed wood substrate of the present invention has a significantly different internal structure distribution from that of natural wood. The density distribution test shows that the resin wood is composed of earlywood, latewood, high-density compressive tissue and resin region. The overall mechanical properties of the wood are significantly improved compared with untreated wood. The resin fills the cracks and cavities and provides support and reinforcement to the surrounding wood tissue. The resin wood has advantages such as high density and high hardness.

[0022] (3) In the process of wood processing, the present invention selects high-strength and low-pollution epoxy resin. The resulting composite material is environmentally friendly and will not produce toxic volatile substances during use, making it easy to process and utilize. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the preparation process of the method of the present invention; Figure 2 These are CT scan images and pore distribution diagrams of different preparation stages of the present invention. Figure 3 This is a three-dimensional schematic diagram of the structural reconstruction of the reconstructed resin wood prepared according to the present invention. Detailed Implementation

[0024] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0025] In the examples, room temperature refers to 25°C, and normal pressure refers to one standard atmosphere. "Overall moisture content of wood," also known as the oven-dry moisture content of wood, refers to the percentage of water mass in the wood relative to its oven-dry mass. In the examples, all moisture content units (%) represent mass percentages.

[0026] The material physical and mechanical property testing standards used in the examples are as follows: Density determination: The density of the structurally reconstructed resin wood in the examples was measured in accordance with the requirements of GBT 1927.5-2021 "Density Determination". The sample size was 20mm (longitudinal) × 20mm (chord) × 20mm (diameter). Hardness test 1: The structural reconstructed resin wood tissue area in the example was measured according to the requirements of GB / T 38119-2019 "Test of Shore Hardness Tester". The sample size was 50mm (longitudinal) × 50mm (chord) × 50mm (diameter). Hardness test 2: The hardness of the entire structure-reconstructed resin wood in the example was measured according to the requirements of GBT 1927.19-2021 "Determination of Hardness". The test material size was 50mm (longitudinal) × 50mm (chord) × 50mm (diameter), and the steel ball indentation depth was 5.64mm. Bending strength test: The structural reconstructed resin wood in the example was measured in accordance with the requirements of GBT 1927.9-2021 "Test of Bending Strength". The specimen size was 300mm (longitudinal) × 20mm (chord) × 50mm (diameter), the span was 240mm, the test speed was 2mm / min, the lower limit load of vertical deformation was 300N, and the upper limit load was 700N.

[0027] Example 1 The specific steps are as follows: (1) Under ambient conditions, eucalyptus wood with dimensions of 20cm (width) × 8cm (thickness) × 200cm (length) was dried to adjust the moisture content to 40%; (2) The wood was treated using a continuous tunnel microwave treatment device with the following parameters: microwave frequency 915MHz, microwave source power 140kW, and microwave treatment time 120s, so that the microwave energy density was adjusted to 145kWh / m³. 3 After processing, the wood was removed from the microwave device and water vapor was released for 10 minutes to obtain a wood substrate with microcracks in the first stage of structural reconstruction. (3) The wood substrate from the first stage of structural reconstruction was subjected to microwave treatment again, with a microwave energy density of 145 kWh / m³. 3 The wood substrate was removed from the microwave device and structural reconstruction of crack propagation and tissue compression was obtained in a two-stage process. (4) Add 100 parts of polyetheramine curing agent to every 300 parts of epoxy resin by weight to prepare a two-component epoxy resin. The initial viscosity of the prepared resin is 300 mPa·s, the construction time is 120 min, and the viscosity is 750 mPa·s after 120 min. (5) Control the moisture content of the structurally reconstructed wood substrate to 10% by drying, cut it to a size of 6cm (width) × 2cm (thickness) × 30cm and put it into a container. Add 75 parts of two-component epoxy resin for every 100 parts of wood substrate by weight. Add 1 to 5 parts of epoxy resin as needed so that the resin liquid level is more than 5mm higher than the upper surface of the wood substrate. (6) Place the container containing the wood substrate and resin in a vacuum test chamber, set the vacuum environment to -0.08MPa and immerse for 30 minutes to allow the air inside the wood substrate to slowly escape. After releasing the pressure to normal pressure, immediately evacuate to -0.08MPa and immerse for 30 minutes. After releasing the pressure, let it stand and cure at room temperature and pressure for 24 hours. Remove the material from the container to obtain the structurally reconstructed resin wood.

[0028] Depend on Figure 2 It can be observed that after microwave treatment, the wood develops regularly distributed cracks and cavities, along with a dense, high-gloss, high-density compressed structure. These structures appear as darker areas on the wood, and the high and low density distribution is redistributed according to the earlywood and latewood regions of the natural wood. Impregnation with resin significantly increases the overall density of the material, resulting in a more uniform density distribution. In CT testing, the proportion of cracks and cavities decreased from 20%–30% to 0.05%–0.5%, indicating that the resin almost completely filled all cracks and cavities. Figure 3 ).

[0029] Hardness tests were conducted on untreated natural eucalyptus wood, structurally reconstructed wood substrate, and structurally reconstructed resin wood in this embodiment, and the results are shown in Table 1.

[0030] Table 1. Hardness of natural eucalyptus wood, structurally reconstructed wood substrates, and structurally reconstructed resin wood As shown in Table 1, the structurally reconstructed wood substrate produced new structural regions compared to the untreated wood. Local compression increased the hardness of the tissue. The hardness of different tissue regions of the structurally reconstructed resin wood was significantly higher than that of the untreated wood. Epoxy resin filled the cracks and cavities and provided support and reinforcement to the surrounding wood tissue, significantly improving the mechanical properties of the wood.

[0031] Example 2 (1) Under ambient conditions, eucalyptus wood with dimensions of 20cm (width) × 8cm (thickness) × 200cm (length) was dried to adjust the moisture content to 40%; (2) The wood was treated using a continuous tunnel microwave treatment device with the following parameters: microwave frequency 915MHz, microwave source power 140kW, and microwave treatment time 120s, so that the microwave energy density was adjusted to 145kWh / m³. 3After processing, the wood was removed from the microwave device and water vapor was released for 10 minutes to obtain a wood substrate with microcracks in the first stage of structural reconstruction. (3) The wood substrate from the first stage of structural reconstruction was subjected to microwave treatment again, with a microwave energy density of 145 kWh / m³. 3 The wood substrate was removed from the microwave device and structural reconstruction of crack propagation and tissue compression was obtained in a two-stage process. (4) Add 100 parts of polyetheramine curing agent and 150 parts of aluminum hydroxide to every 300 parts of epoxy resin by weight to prepare modified epoxy resin. The initial viscosity of the prepared resin is 650 mPa·s, the construction time is 120 min, and the viscosity is 1250 mPa·s after 120 min. (5) Control the moisture content of the structural reconstructed wood substrate to 10%, cut it to a size of 6cm (width) × 2cm (thickness) × 30cm and put it into a container. Add 80 parts of two-component epoxy resin for every 100 parts of wood substrate by weight. Add 1 to 5 parts of epoxy resin as needed so that the resin liquid level is more than 5mm higher than the upper surface of the wood substrate. (6) Place the container containing the wood substrate and resin in a vacuum test chamber, set the vacuum environment to -0.08MPa for 30 minutes to allow the air inside the wood substrate to slowly escape. After releasing the pressure to normal pressure, immediately evacuate to -0.08MPa for 30 minutes. After releasing the pressure, let it stand and cure at room temperature and pressure for 54 hours. Remove the material from the container to obtain the structurally reconstructed resin wood.

[0032] Example 3 (1) Under ambient conditions, eucalyptus wood with dimensions of 20cm (width) × 8cm (thickness) × 200cm (length) was dried to adjust the moisture content to 40%; (2) The wood was treated using a continuous tunnel microwave treatment device with the following parameters: microwave frequency 915MHz, microwave source power 140kW, and microwave treatment time 120s, so that the microwave energy density was adjusted to 145kWh / m³. 3 After processing, the wood was removed from the microwave device and water vapor was released for 10 minutes to obtain a wood substrate with microcracks in the first stage of structural reconstruction. (3) The wood substrate from the first stage of structural reconstruction was subjected to microwave treatment again, with a microwave energy density of 145 kWh / m³. 3 The wood substrate was removed from the microwave device and structural reconstruction of crack propagation and tissue compression was obtained in a two-stage process. (4) Add 100 parts of polyetheramine curing agent, 30 parts of aluminum hydroxide and 30 parts of 2-ethyl-hexyl glycidyl ether to every 300 parts of epoxy resin by weight to prepare modified epoxy resin. The initial viscosity of the prepared resin is 245 mPa·s, the construction time is 120 min, and the viscosity is 495 mPa·s after 120 min of preparation. (5) Control the moisture content of the structurally reconstructed wood substrate to 10%, cut it to a size of 6cm (width) × 2cm (thickness) × 30cm and put it into a container. Add 75 parts of two-component epoxy resin for every 100 parts of wood substrate by weight. Add 1 to 5 parts of epoxy resin as needed so that the resin liquid level is more than 5mm higher than the upper surface of the wood substrate. (6) Place the container containing the wood substrate and resin in a vacuum test chamber, set the vacuum environment to -0.08MPa for 30 minutes to allow the air inside the wood substrate to slowly escape. After releasing the pressure to normal pressure, immediately evacuate to -0.08MPa for 30 minutes. After releasing the pressure, let it stand and cure at room temperature and pressure for 54 hours. Remove the material from the container to obtain the structurally reconstructed resin wood.

[0033] The natural eucalyptus wood and the structurally reconstructed resin wood prepared in Examples 1-3 were tested, and the technical indicators are shown in Table 2.

[0034] Table 2 Technical Specifications of Eucalyptus Structural Reconstruction Resin Wood As shown in Table 2, the overall density and hardness of the reconstructed resin-treated wood are significantly improved compared to untreated wood, with a partial increase in flexural strength. Adjusting the epoxy resin with aluminum hydroxide and 2-ethylhexyl glycidyl ether can influence the mechanical properties of the composite material. The use of 2-ethylhexyl glycidyl ether reduces material rigidity and increases flexibility, making it more prone to elastic deformation than natural wood, suitable for applications such as vibration-damping and noise-reducing flooring. The use of aluminum hydroxide increases material density, significantly improving material hardness and flexural strength, suitable for high-performance structural components and building structural materials. Appropriate addition of different proportions of modifiers will allow the composite material to function effectively in various application scenarios.

[0035] Example 4 (1) Under ambient conditions, eucalyptus wood with dimensions of 20cm (width) × 8cm (thickness) × 200cm (length) was dried to adjust the moisture content to 40%; (2) The wood was treated using a continuous tunnel microwave treatment device with the following parameters: microwave frequency 915MHz, microwave source power 140kW, and microwave treatment time 120s, so that the microwave energy density was adjusted to 145kWh / m³. 3 After processing, the wood was removed from the microwave device and water vapor was released for 10 minutes to obtain a wood substrate with microcracks in the first stage of structural reconstruction. (3) The wood substrate from the first stage of structural reconstruction was subjected to microwave treatment again, with a microwave energy density of 145 kWh / m³. 3 The wood substrate was removed from the microwave device and structural reconstruction of crack propagation and tissue compression was obtained in a two-stage process. (4) Add 35 parts of toughening polyetheramine curing agent to every 100 parts of epoxy resin to prepare toughening modified epoxy resin. The initial viscosity of the prepared resin is 300 mPa·s, the construction time is 120 min, and the viscosity is 650 mPa·s after 120 min. (5) Control the moisture content of the structurally reconstructed wood substrate to 10%, cut it to a size of 6cm (width) × 2cm (thickness) × 30cm and put it into a container, pour in the mixed epoxy resin, and make the resin liquid level more than 5mm above the upper surface of the wood substrate. (6) Place the container containing the wood substrate and resin in a vacuum drying test chamber, set the vacuum environment to -0.09MPa and immerse for 50 minutes to allow the air inside the wood substrate to slowly escape. After releasing the pressure, set the drying chamber temperature to 60℃ and heat and cure under normal pressure for 2 hours. Remove the material from the container to obtain the structurally reconstructed resin wood.

[0036] The natural eucalyptus wood, the structurally reconstructed wood substrate, and the structurally reconstructed resin wood prepared in Example 4 were tested, and the technical indicators are shown in Table 3.

[0037] Table 3 Technical Specifications of Resin Wood for Structural Reconstruction at Different Stages As shown in Table 3, the physical and mechanical properties of the reconstructed resin wood vary at different stages of the preparation process. The reconstructed wood substrate undergoes internal tissue compression, resulting in a higher density relative to natural wood. Due to the change in tissue structure, the bending strength and bending modulus of elasticity are relatively reduced, while the impact toughness is improved. Through resin filling, the crack positions of the reconstructed wood substrate are fixed and strengthened, and the overall density, bending performance, and impact toughness of the material are significantly improved.

[0038] In summary, the structurally reconstructed wood substrate provided by this invention produces a high-density compression structure relative to untreated wood, and the wood tissue structure is reconstructed. The high-density compression structure area is characterized by a darker wood color and clearer wood grain, while producing a large number of uniformly distributed cracks and cavities. Its composite material has the advantages of high density and high hardness. The preparation process of this product is efficient and rapid, and no toxic volatile substances are produced during use, making it environmentally friendly and pollution-free.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for producing a structural reconfiguration type resin wood, characterized by, The method comprises the following steps: Wood with moisture content of 20%~80% is subjected to intermittent microwave treatment with energy density of 60~150kWh / m 3 , to form high-density compressed wood structure and crack cavity structure in the wood, to obtain a structure-reconstructed wood base material; the moisture content of the wood base material is regulated to 5%~12%, and then a low-viscosity thermosetting resin with viscosity of 100~500mPa·s is filled into the crack cavity structure of the wood base material by vacuum impregnation and solidified, to obtain a structure-reconstructed resin wood.

2. The method for preparing structurally reconstructed resin wood as described in claim 1, characterized in that, The microwave treatment is performed twice with an interval of 5-20 min.

3. The method for preparing structurally reconstructed resin wood as described in claim 1, characterized in that, The specific steps of vacuum impregnation are as follows: The wood substrate is immersed in the resin, and the liquid level of the resin is higher than the upper surface of the wood substrate; the wood substrate and the resin are placed in a vacuum impregnation device, a vacuum environment of-0.10 to-0.05 MPa is set, and impregnation is performed for 10-60 min, so that the air in the wood is slowly discharged, and the vacuum is performed once from vacuum extraction to pressure maintenance to pressure release to normal pressure. The vacuum is performed 1-3 times, and after the pressure is released, the temperature is 10-100 ℃ and the pressure is normal, and the curing is performed for 1-72 h.

4. The method for preparing structurally reconstructed resin wood as described in claim 1, characterized in that, The microwave treatment device is a tunnel microwave treatment device or a box microwave treatment device.

5. The method for preparing structurally reconstructed resin wood as described in claim 1, characterized in that, The microwave frequency of the microwave radiation treatment is 0.1-24 GHz, the microwave power is 20-250 kW, and the microwave treatment time is 20-240 s.

6. The method for preparing structurally reconstructed resin wood as described in claim 5, characterized in that, The microwave frequency of the microwave radiation treatment is 915 MHz, the microwave power is 60-200 kW, and the microwave treatment time is 30-200 s.

7. The method for preparing structurally reconstructed resin wood as described in claim 1, characterized in that, The thermosetting resin includes an epoxy resin, an unsaturated polyester resin, and a phenolic resin.

8. The method for preparing structurally reconstructed resin wood as described in claim 7, characterized in that, The thermosetting resin is an epoxy resin system, which includes an epoxy resin, a curing agent, and a resin modifier; the resin modifier includes aluminum hydroxide and 2-ethyl-hexyl glycidyl ether.

9. The method for preparing structurally reconstructed resin wood as described in claim 1, characterized in that, 20-100 parts of the resin are added per 100 parts of the wood substrate by mass.

10. The structure-reconstructed resin wood prepared by the preparation method in any one of claims 1-9.

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