Hyperbranched topologically hybrid silicon impregnation modification liquid and method and impregnation modified wood of impregnation modified wood

Abstract

The application discloses a kind of hyperbranched topological hybrid silicon impregnation modification liquid and its impregnation modified wood method and impregnation modified wood, the hyperbranched topological hybrid silicon impregnation modification liquid includes the following components: component A and component B, wherein, component A includes silicon hybrid component, hyperbranched topological hybrid component and mixed solvent, the mass percentage concentration of silicon hybrid component in the A component is 10%~60%, the mass percentage concentration of hyperbranched topological hybrid component is 1%~15%;Component B includes initiation component and mixed solvent, the mass percentage concentration of initiation component in the B component is 0.1%~2%.The hyperbranched topological hybrid silicon impregnation modification liquid of the application can produce "silicon-amine" topological hybrid crosslinking chemical bond in wood inside, form organic-inorganic hyperbranched hybrid system with stable three-dimensional topological structure, play the role of synergistic enhancement wood.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of composite materials, and particularly relates to a hyperbranched topological hybrid silicon impregnation modification liquid, a method for impregnation modification of wood and impregnation modified wood. BACKGROUND

[0002] Wood, as a kind of natural renewable material, is widely used in the fields of building, furniture and the like. However, due to the lack of natural forest resources in China, combined with the increasing consumption of wood in the world, the shortage of natural forest resources has become a prominent problem. Fast-growing wood has the advantages of fast growth and short rotation period, and has become a hot spot in the research of wood science as a substitute for natural wood. However, fast-growing wood has the disadvantages of loose texture, low density and poor mechanical properties, and therefore needs to be modified to improve its use value and achieve the purpose of using inferior wood.

[0003] Due to the porous structure of fast-growing wood, a large number of pores exist in the interior of the wood. The modification of fast-growing wood is mainly in the form of impregnation modification, which fills the pores of wood with modification liquid and strengthens cellulose and hemicellulose at the same time to achieve the purpose of strengthening. At present, the modification liquid used for impregnation modification of fast-growing wood mainly includes organic modification liquid, inorganic modification liquid and organic-inorganic mixed modification liquid. The organic modification liquid is mainly organic resin such as urea-formaldehyde resin and phenol-formaldehyde resin, which is impregnated into the wood and forms organic polymers in the pores of the wood through a series of reactions such as polymerization. At the same time, the hydroxyl and aldehyde groups in the organic resin combine with the active functional groups in the wood to form a stable structure, thereby improving the strength and dimensional stability of the wood. The inorganic modification liquid is mainly a solution of inorganic compounds containing silicon, boron, calcium and the like, which forms a water-insoluble precipitate in the pores of the wood through reaction or physical sedimentation, fills the pores of the wood, and achieves the purpose of strengthening the wood while imparting the wood with the properties of fire resistance, corrosion resistance and the like to improve the use value of the wood. The currently used organic-inorganic mixed modification liquid is composed of organic resin and inorganic compounds, which combines the advantages of organic modification liquid and inorganic modification liquid for modifying wood, thereby better improving the performance of the wood. However, the organic components in the organic-inorganic mixed modification liquid mainly use urea-formaldehyde resin and phenol-formaldehyde resin, which contain harmful substances such as free formaldehyde that can cause harm to the environment and human health, and some modification liquids still have the disadvantages of loose combination, easy loss and moisture absorption. Therefore, how to overcome the above defects and obtain a new impregnation modification liquid for impregnation modification of wood has become a problem to be solved at present. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the deficiencies of the prior art and provide a hyperbranched topological hybrid silicon impregnation modification liquid which is safe and environmentally friendly and has good modification effect, a method for impregnation modification of wood and impregnation modified wood.

[0005] To solve the above technical problems, the present application adopts the following technical solutions.

[0006] The super-branched topological hybrid silicon impregnation modification liquid comprises the following components: component A and component B; the component A comprises a silicon hybrid component, a super-branched topological hybrid component and a mixed solvent, the mass percentage concentration of the silicon hybrid component in the component A is 10% to 60%, the mass percentage concentration of the super-branched topological hybrid component in the component A is 1% to 15%, the silicon hybrid component is one or more of sodium silicate, silica sol, silicone acrylate emulsion, triisopropylsilane, methyltris(butanone oxime)silane, tert-butyl dimethylchlorosilane, epoxy silane, tetraethoxysilane, tetrapropoxysilane and gamma-aminopropyl triethoxysilane, and the super-branched topological hybrid component is one or more of ethylenediamine, diethanolamine, melamine, triisopropanolamine, hexamethylphosphorus triamide, dodecyl dipropyl triamine, n-butyl thiophosphoryl triamine, pentamethyl diethylenetriamine, propanolamine and methanolamine; the component B comprises an initiation component and a mixed solvent, the mass percentage concentration of the initiation component in the component B is 0.1% to 2%, the initiation component is one or more of methyl acrylate, methoxyethyl acrylate, 2-methoxyethyl acrylate and methoxyethyl methacrylate, and the mixed solvent is a mixed solvent composed of water and an organic solvent.

[0007] Preferably, in the mixed solvent of the component A, the mass percentage concentration of the organic solvent in the component A is 1% to 30%; in the mixed solvent of the component B, the mass percentage concentration of the organic solvent in the component B is 1% to 30%; and the organic solvent is one or more of ethanol, toluene and isopropanol.

[0008] As a general technical concept, the present application also provides an impregnation modified wood obtained by impregnation modification treatment of wood to be modified by the super-branched topological hybrid silicon impregnation modification liquid.

[0009] As a general technical concept, the present application also provides a preparation method of impregnation modified wood, comprising the following steps:

[0010] (1) drying the wood to be modified, placing it in an impregnation device, and extracting air in the pores of the wood by negative pressure;

[0011] (2) adding the component A in the super-branched topological hybrid silicon impregnation modification liquid to the impregnation device, and performing a first impregnation treatment under negative pressure when the liquid level is greater than or equal to 2 / 3 of the height of the wood to be modified;

[0012] (3) continue to add the A component in the hyperbranched topological hybrid silicon impregnation modification liquid into the impregnation device, so that the liquid surface is above the wood to be modified, and maintain negative pressure to carry out secondary impregnation treatment, and discharge the A component in the hyperbranched topological hybrid silicon impregnation modification liquid;

[0013] (4) add the B component in the hyperbranched topological hybrid silicon impregnation modification liquid into the impregnation device, so that the liquid surface is above the wood to be modified, and maintain negative pressure to carry out tertiary impregnation treatment;

[0014] (5) take out the wood to be modified, heat and cure, dry, and obtain the impregnation modified wood.

[0015] Preferably, the specific process of the primary impregnation treatment is maintaining negative pressure of -0.06 MPa to -0.08 MPa for 1 h to 3 h, the specific process of the secondary impregnation treatment is maintaining negative pressure of -0.06 MPa to -0.08 MPa for 1 h to 3 h, and the specific process of the tertiary impregnation treatment is maintaining negative pressure of -0.06 MPa to -0.08 MPa for 1 h to 6 h.

[0016] Preferably, after discharging the A component in the hyperbranched topological hybrid silicon impregnation modification liquid, the method further comprises the following treatment: repeating steps (2) and (3); and the number of repetitions is 1 to 3.

[0017] Preferably, in step (1), the wood to be modified is Chinese fir.

[0018] Preferably, in step (1), the specific process of drying is drying the wood to be modified to a moisture content of 8% to 12%; and the specific method of extracting air in the wood pores by negative pressure is maintaining negative pressure of -0.06 MPa to -0.08 MPa for 0.5 h to 2 h.

[0019] Preferably, in step (4), before adding the B component in the hyperbranched topological hybrid silicon impregnation modification liquid, the method further comprises the following treatment: maintaining negative pressure of -0.06 MPa to -0.08 MPa for 0.5 h to 1 h to discharge the excess A component in the hyperbranched topological hybrid silicon impregnation modification liquid in the wood to be modified.

[0020] Preferably, in step (5), the temperature of heat curing is 60°C to 120°C, and the time of heat curing is 1 h to 20 h.

[0021] Compared with the prior art, the method has the following advantages:

[0022] (1) The application provides a hyperbranched topological hybrid silicon impregnation modification liquid, which comprises an A component and a B component, wherein the A component comprises a silicon hybrid component, a hyperbranched topological hybrid component and a mixed solvent, and the B component comprises an initiation component and a mixed solvent; on the one hand, the hyperbranched topological hybrid component without free formaldehyde plays a coating and fixing role on the silicon hybrid component; on the other hand, the hyperbranched topological hybrid component and the silicon hybrid component produce cross-linking under the action of the initiation component, produce a'silicon-amine' topological hybrid cross-linking chemical bond, form an organic-inorganic hyperbranched hybrid system with a stable three-dimensional topological structure, play a synergistic reinforcing role on wood, greatly improve the strength of wood, improve the anti-swelling and shrinking rate and the anti-leaching property, and reduce the moisture absorption property; in addition, compared with the urea-formaldehyde and phenol-formaldehyde organic resins used in the traditional impregnation modification technology, the hyperbranched topological hybrid silicon impregnation modification liquid does not contain toxic and harmful substances such as free formaldehyde, is green and environmentally friendly, and mainly comprises inorganic components of the silicon hybrid component in the impregnation modification liquid, greatly reduces the amount of organic components, i.e. the hyperbranched topological hybrid component, and thus reduces the production cost.

[0023] (2) The application also provides a method for impregnating modified wood, which adopts a segmented impregnation method to impregnate the wood to be modified, namely, first, immerse part of the wood in the A component of the hyperbranched topological hybrid silicon impregnation modification liquid, and then, after the air in the wood is exhausted, immerse the wood in the A component of the hyperbranched topological hybrid silicon impregnation modification liquid completely, then exhaust the A component, and then immerse the wood in the B component of the hyperbranched topological hybrid silicon impregnation modification liquid. In the impregnation process, the impregnation modification liquid can fully penetrate from the bottom to the end of the wood to be modified, because, in the initial impregnation process (i.e., the first impregnation treatment), since one end of the wood is not completely immersed in the A component of the hyperbranched topological hybrid silicon impregnation modification liquid, not only can the air in the wood pores be fully exhausted from bottom to top, but also the A component of the hyperbranched topological hybrid silicon impregnation modification liquid can enter the wood pores under the action of the internal and external pressure difference, so as to achieve the purpose of fully impregnating the wood, and avoid the defect that the conventional impregnation method is easy to seal the air in the wood and difficult to fully penetrate. At the same time, the A component and the B component of the hyperbranched topological hybrid silicon impregnation modification liquid do not react at room temperature, and need to be heated and cross-linked and cured subsequently, so that the A component and the B component react in the wood pores to form a stable organic-inorganic hybrid system with a hyperbranched topological structure, thereby achieving the purpose of synergistically enhancing the wood. The method of the application is particularly suitable for application to Chinese fir, which is a difficult-to-impregnate material due to its small pores and the existence of occluded pores and other structures. The traditional impregnation methods such as negative pressure impregnation or positive pressure impregnation are difficult to completely exhaust the air in the wood pores by completely putting the wood into the impregnation liquid, so it is difficult to impregnate the modifier into the Chinese fir by using the traditional impregnation method. In addition, compared with the traditional pressure impregnation method, the method of the application does not need to pressurize the impregnation modification liquid during the impregnation modification process, and has lower requirements for the impregnation tank and various equipment, and is safer and more reliable. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Figure 1 is a structural schematic diagram of the impregnation tank of the application.

[0025] Figure legend:

[0026] 1, impregnation tank body; 2, support; 3, discharge valve; 4, feed valve; 5, liquid level meter; 6, exhaust valve; 7, positive pressure gauge; 8, negative pressure gauge; 9, pressure relief valve; 10, impregnation modification liquid; 11, wood to be modified. DETAILED DESCRIPTION

[0027] The application will be further described below in conjunction with the drawings of the specification and specific preferred embodiments, but the protection scope of the application is not limited thereby. The materials and instruments used in the following examples are all commercially available.

[0028] Example 1:

[0029] The hyperbranched topological hybrid silicon impregnation modification liquid of the present application comprises the following components: component A and component B; wherein component A is sodium silicate, methyltris(butanone oxime)silane, triisopropanolamine, ethanol, and water; the mass percentage concentration of sodium silicate in the component A is 10%, the mass percentage concentration of methyltris(butanone oxime)silane is 3%, the mass percentage concentration of triisopropanolamine is 1%, and the mass percentage concentration of ethanol is 5%; component B is 2-acrylic acid-2-methoxyethyl ester, methoxyethyl methacrylate, ethanol, and water; the mass percentage concentration of 2-acrylic acid-2-methoxyethyl ester solution in the component B is 0.5%, the mass percentage concentration of methoxyethyl methacrylate is 0.3%, and the mass percentage concentration of ethanol is 10%.

[0030] A method for impregnation modification of wood, which uses the above-mentioned hyperbranched topological hybrid silicon impregnation modification liquid for impregnation modification treatment, comprising the following steps:

[0031] (1) saw the artificial forest spruce into a board with a thickness of 20 mm, dry to a moisture content of 8-12%, vertically into the impregnation tank, and compacted with a weight to prevent the impregnation modification liquid 10 from floating after injection; open the exhaust valve 6, draw the impregnation tank to a negative pressure of-0.06 MPa, and maintain for 0.5 h.

[0032] In this embodiment, the impregnation tank used is as shown in Figure 1 The impregnation tank comprises an impregnation tank body 1 and a support 2 for supporting the impregnation tank body 1, the side of the impregnation tank body 1 is provided with a feeding valve 4 and a liquid level meter 5, the liquid level meter 5 is arranged above the feeding valve 4, the bottom is provided with a discharge valve 3, the top is provided with an exhaust valve 6, a positive pressure gauge 7, a negative pressure gauge 8, and a pressure relief valve 9, and the impregnation tank body 1 is loaded with an impregnation modification liquid 10 and wood to be modified 11.

[0033] (2) close the exhaust valve 6, open the feeding valve 4 at the bottom of the impregnation tank body 1, the component A of the above-mentioned hyperbranched topological hybrid silicon impregnation modification liquid is sucked from the bottom of the impregnation tank body 1 under the action of negative pressure, when the component A reaches the position of four-fifths of the height of the spruce, the feeding valve 4 is closed, the vacuum pump is opened, and the exhaust valve 6 is opened, and the negative pressure is kept at-0.06 MPa for 2 h, that is, one impregnation treatment is carried out.

[0034] (3) close the exhaust valve 6, open the feeding valve 4, continue to add the component A of the hyperbranched topological hybrid silicon impregnation modification liquid, and after the component A is higher than the top of the spruce, the feeding valve 4 is closed, the negative pressure is kept at-0.06 MPa for 2 h, that is, two impregnation treatments are carried out; open the pressure relief valve 9, and after the negative pressure gauge returns to 0, open the discharge valve 3 to discharge the component A of the hyperbranched topological hybrid silicon impregnation modification liquid.

[0035] (4) Close the discharge valve 3, open the exhaust valve 6, and draw negative pressure to-0.06 MPa, keep for 1 h, then open the discharge valve 3, and discharge the A component of the hyperbranched topological hybrid silicon impregnation modification liquid infiltrated from the Chinese pine, and then close the discharge valve 3.

[0036] (5) Open the exhaust valve 6, and draw negative pressure to-0.06 MPa, close the exhaust valve 6, keep for 0.5 h, then open the feeding valve 4 at the bottom of the impregnation tank 1, and suck the B component of the hyperbranched topological hybrid silicon impregnation modification liquid, and when the liquid level is higher than the top of the Chinese pine, keep for 3 h under the negative pressure of-0.06 MPa, namely, three times of impregnation treatment.

[0037] (6) Open the pressure relief valve 9 and the discharge valve 3, and discharge the remaining solution, take out the plantation Chinese pine after impregnation treatment, and heat and solidify and dry at 60℃ for 6 h, and then the impregnation modified wood is obtained.

[0038] Example 2:

[0039] The hyperbranched topological hybrid silicon impregnation modification liquid of the application comprises the following components: A component and B component; wherein the A component is: sodium silicate, silica sol, melamine, diethanolamine, ethanol, water; the mass percentage concentration of sodium silicate in the A component is 20%, the mass percentage concentration of silica sol is 10%, the mass percentage concentration of melamine is 5%, the mass percentage concentration of diethanolamine is 3%, and the mass percentage concentration of ethanol is 10%; the B component is: methoxyethyl methacrylate, ethanol, isopropyl alcohol, water; the mass percentage concentration of methoxyethyl methacrylate in the B component is 0.8%, the mass percentage concentration of ethanol is 5%, and the mass percentage concentration of isopropyl alcohol is 5%.

[0040] The method for impregnation modification of wood adopts the above-mentioned hyperbranched topological hybrid silicon impregnation modification liquid for impregnation modification treatment, and comprises the following steps:

[0041] (1) Saw the plantation Chinese pine into plates with a thickness of 30 mm, dry to a moisture content of 8-12%, and vertically place into the impregnation tank, and compact with a weight to prevent floating after impregnation modification liquid injection; open the exhaust valve, and draw negative pressure to-0.07 MPa in the impregnation tank, and keep for 0.5 h.

[0042] (2) Close the exhaust valve, open the feeding valve at the bottom of the impregnation tank, and the A component of the above-mentioned hyperbranched topological hybrid silicon impregnation modification liquid is sucked from the bottom of the impregnation tank under the action of negative pressure, when the A component reaches the position of four-fifths of the height of the Chinese pine, close the feeding valve, open the vacuum pump, and open the exhaust valve, and keep for 3 h under the negative pressure of-0.07 MPa, namely, one time of impregnation treatment.

[0043] (3) Close the exhaust valve, open the feeding valve, continue to add the A component of the hyperbranched topological hybrid silicon impregnation modification liquid, and close the feeding valve after the A component of the hyperbranched topological hybrid silicon impregnation modification liquid is above the top of the Chinese fir. Then, keep the negative pressure at -0.07 MPa for 3 h, that is, perform secondary impregnation treatment. Open the pressure relief valve, and open the discharge valve after the negative pressure gauge returns to 0.

[0044] (4) Repeat steps (2) and (3).

[0045] (5) Close the discharge valve, open the exhaust valve, and extract negative pressure to -0.07 MPa for 1 h. Then, open the discharge valve, and close the discharge valve after the A component of the hyperbranched topological hybrid silicon impregnation modification liquid is completely extracted from the Chinese fir.

[0046] (6) Open the exhaust valve, extract negative pressure to -0.07 MPa, close the exhaust valve, and keep for 0.5 h. Then, open the feeding valve at the bottom of the impregnation tank, and suck the B component of the hyperbranched topological hybrid silicon impregnation modification liquid. Keep the liquid level above the top of the Chinese fir under negative pressure of -0.07 MPa for 3 h, that is, perform tertiary impregnation treatment.

[0047] (7) Open the pressure relief valve and the discharge valve, and discharge the remaining solution. Then, take out the plantation Chinese fir after impregnation treatment, and heat and solidify the Chinese fir at 70 ℃ for 8 h to obtain impregnated modified wood.

[0048] Example 3:

[0049] The hyperbranched topological hybrid silicon impregnation modification liquid of the present application comprises the following components: an A component and a B component. The A component comprises sodium silicate, silicone emulsion, hexamethylphosphorus triamide, dodecyl dipropyl triamine, ethanol, and water. The mass percentage concentration of sodium silicate in the A component is 30%, the mass percentage concentration of silicone emulsion is 8%, the mass percentage concentration of hexamethylphosphorus triamide is 3%, the mass percentage concentration of dodecyl dipropyl triamine is 5%, and the mass percentage concentration of ethanol is 10%. The B component comprises 2-methoxyethyl acrylate, ethanol, isopropyl alcohol, toluene, and water. The mass percentage concentration of 2-methoxyethyl acrylate in the B component is 1.5%, the mass percentage concentration of ethanol is 5%, the mass percentage concentration of isopropyl alcohol is 3%, and the mass percentage concentration of toluene is 2%.

[0050] The method for impregnation modification of wood comprises the following steps: using the hyperbranched topological hybrid silicon impregnation modification liquid described above to perform impregnation modification treatment.

[0051] (1) The artificial forest of Chinese fir is sawed into boards with a thickness of 50 mm, dried to a moisture content of 8-12%, and placed vertically in the impregnation tank, and compacted with a weight to prevent the impregnation modification liquid from floating after injection; open the exhaust valve, and draw the impregnation tank to a negative pressure of -0.08 MPa, and maintain for 1 h.

[0052] (2) Close the exhaust valve, open the feed valve at the bottom of the impregnation tank, and the A component of the hyperbranched topological hybrid silicon impregnation modification liquid described above is drawn from the bottom of the impregnation tank under the action of negative pressure, when the A component reaches the position of four-fifths of the height of the Chinese fir, close the feed valve, open the vacuum pump, open the exhaust valve, and maintain at a negative pressure of -0.08 MPa for 3 h, i.e. one impregnation treatment.

[0053] (3) Close the exhaust valve, open the feed valve, and continue to add the A component of the hyperbranched topological hybrid silicon impregnation modification liquid, so that it is above the top of the Chinese fir, then close the feed valve, and maintain at a negative pressure of -0.08 MPa for 3 h, i.e. two impregnation treatments; open the pressure relief valve, and when the negative pressure gauge returns to 0, open the discharge valve to discharge the A component of the hyperbranched topological hybrid silicon impregnation modification liquid.

[0054] (4) Repeat steps (2) and (3) for 2 times.

[0055] (5) Close the discharge valve, open the exhaust valve, and draw to a negative pressure of -0.08 MPa, and maintain for 1 h, then open the discharge valve to discharge the A component of the hyperbranched topological hybrid silicon impregnation modification liquid that has penetrated out of the Chinese fir, and close the discharge valve.

[0056] (6) Open the exhaust valve, draw to a negative pressure of -0.08 MPa, close the exhaust valve, and maintain for 0.5 h, then open the feed valve at the bottom of the impregnation tank, and draw in the B component of the hyperbranched topological hybrid silicon impregnation modification liquid described above, so that the liquid level is above the top of the Chinese fir, and maintain at a negative pressure of -0.08 MPa for 3 h, i.e. three impregnation treatments.

[0057] (7) Open the pressure relief valve and the discharge valve, and discharge the remaining solution, and take out the artificial forest of Chinese fir after impregnation treatment, and heat and cure at 80°C for 10 h, and then obtain the impregnated modified wood.

[0058] The properties of the impregnated modified wood of Example 1, Example 2, Example 3 and unmodified plantation fir are detected, and the results are shown in Table 1. The wood bending strength test method is GB / T1936.1-2009 Wood Bending Strength Test Method, and the wood hardness test method is GB / T1941-2009 Wood Hardness Test Method. As shown in Table 1, after impregnated modification by the hyperbranched topological hybrid silicon impregnation modification liquid, the weight and density of the plantation fir are significantly improved, so it can be proved that the impregnation modification liquid has successfully impregnated into the wood; at the same time, by comparing the mechanical properties of the unmodified plantation fir and the impregnated modified wood of Example 1-3, it can be seen that the bending strength, compressive strength, end surface hardness and anti-swelling shrinkage rate of the impregnated modified wood of Example 1-3 are obviously improved, which shows that the method of the impregnated modified wood of the application has great improvement on the mechanical properties of the plantation fir.

[0059] Table 1 Comparison of properties of impregnated modified wood of Example 1-3 and unmodified plantation fir

[0060]

[0061] The above description is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make many possible changes and modifications to the technical solutions of the present application, or modify equivalent embodiments with the above disclosed methods and technical contents without departing from the spirit and technical solutions of the present application. Therefore, any simple modification, equivalent replacement, equivalent change and modification of the above embodiments according to the technical essence of the present application, which does not deviate from the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. A method for producing impregnated modified wood, characterized in that The method comprises the following steps: (1) drying the wood to be modified, and placing the wood to be modified in an impregnation device to remove air in pores of the wood by negative pressure; (2) adding the A component in the hyperbranched topological hybrid silicon impregnation modification liquid to the impregnation device, and performing a first impregnation treatment under negative pressure when the liquid level is greater than 2 / 3 of the height of the wood to be modified; (3) continuously adding the A component in the hyperbranched topological hybrid silicon impregnation modification liquid to the impregnation device to make the liquid level submerge the wood to be modified, and performing a second impregnation treatment under negative pressure to remove the A component in the hyperbranched topological hybrid silicon impregnation modification liquid; (4) adding the B component in the hyperbranched topological hybrid silicon impregnation modification liquid to the impregnation device to make the liquid level submerge the wood to be modified, and performing a third impregnation treatment under negative pressure; (5) taking out the wood to be modified, and performing heating and curing and drying to obtain the impregnated modified wood. The hyperbranched topological hybrid silicon impregnation modification liquid comprises the following components: the A component and the B component; the A component comprises a silicon hybrid component, a hyperbranched topological hybrid component and a mixed solvent, the mass percentage concentration of the silicon hybrid component in the A component is 10%-60%, and the mass percentage concentration of the hyperbranched topological hybrid component in the A component is 1%-15%; the silicon hybrid component is one or more of sodium silicate, silica sol, silicone acrylate emulsion, triisopropylsilane, methyltris(butanone oxime)silane, tert-butyl dimethylchlorosilane, epoxy silane, tetraethoxysilane, tetrapropoxysilane and gamma-aminopropyl triethoxysilane; the hyperbranched topological hybrid component is one or more of ethylenediamine, diethanolamine, melamine, triisopropanolamine, hexamethylphosphorus triamide, dodecyl dipropyl triamine, n-butyl thiophosphoryl triamine, pentamethyl diethylenetriamine, propyl alcohol amine and methanol amine; the B component comprises an initiation component and a mixed solvent, the mass percentage concentration of the initiation component in the B component is 0.1%-2%, and the initiation component is one or more of methyl acrylate, methoxyethyl acrylate, 2-methoxyethyl 2-acrylate and methoxyethyl methacrylate; and the mixed solvent is a mixed solvent composed of water and an organic solvent.

2. The method for producing impregnated modified wood according to claim 1, characterized by, The mass percentage concentration of the organic solvent in the mixed solvent of the A component is 1%-30%; the mass percentage concentration of the organic solvent in the mixed solvent of the B component is 1%-30%; and the organic solvent is one or more of ethanol, toluene and isopropyl alcohol.

3. The method for preparing the impregnated modified wood according to claim 1, characterized by, The specific process of the first impregnation treatment is that the negative pressure is kept at-0.06 MPa to-0.08 MPa for 1-3 hours, the specific process of the second impregnation treatment is that the negative pressure is kept at-0.06 MPa to-0.08 MPa for 1-3 hours, and the specific process of the third impregnation treatment is that the negative pressure is kept at-0.06 MPa to-0.08 MPa for 1-6 hours.

4. The method for producing the impregnated modified wood according to claim 3, characterized by, After the A component in the hyperbranched topological hybrid silicon impregnation modification liquid is removed, the following treatment is further included: repeating steps (2) and (3); and the number of repetitions is 1-3 times.

5. The method for producing the impregnated modified wood according to any one of claims 1 to 4, characterized by, In step (1), the wood to be modified is Chinese fir.

6. The method for producing the impregnated modified wood according to any one of claims 1 to 4, characterized by, In step (1), the specific drying process is that the wood to be modified is dried to a moisture content of 8% to 12%; the specific method for removing air in the wood pores by negative pressure is that the wood to be modified is kept at a negative pressure of -0.06 MPa to -0.08 MPa for 0.5 h to 2 h.

7. The method for producing the impregnated modified wood according to any one of claims 1 to 4, characterized by, In step (4), the specific treatment before adding the component B in the hyperbranched topological hybrid silicon impregnation modification liquid is that the wood to be modified is kept at a negative pressure of -0.06 MPa to -0.08 MPa for 0.5 h to 1 h to remove the excess component A in the hyperbranched topological hybrid silicon impregnation modification liquid.

8. The method for producing the impregnated modified wood according to any one of claims 1 to 4, characterized by, In step (5), the temperature for heating and curing is 60°C to 120°C, and the time for heating and curing is 1 h to 20 h.

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