CN111002413A - Modified wood and preparation method and application thereof - Google Patents

Modified wood and preparation method and application thereof Download PDF

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Publication number
CN111002413A
CN111002413A CN201911293129.5A CN201911293129A CN111002413A CN 111002413 A CN111002413 A CN 111002413A CN 201911293129 A CN201911293129 A CN 201911293129A CN 111002413 A CN111002413 A CN 111002413A
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wood
component
mpa
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pressure
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CN111002413B (en
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孔祥明
林辉
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Tsinghua University
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Tsinghua University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/32—Mixtures of different inorganic impregnating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/04—Combined bleaching or impregnating and drying of wood

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

The invention relates to modified wood and a preparation method thereof, wherein the modified wood comprises a wood body and calcium silicate hydrate gel positioned in the gaps of the wood body. The modified wood provided by the invention has the advantages of high density, dimensional stability and excellent mechanical property. The preparation method of the modified wood comprises the following steps: 1) introducing the component A into pores of a wood body to obtain wood loaded with the component A; 2) and introducing the component B into the pores of the wood loaded with the component A, and reacting the component B with the component A in the pores to generate calcium silicate hydrate gel. The method for strengthening the wood by adopting the inorganic components provided by the invention is energy-saving and environment-friendly. After the wood is strengthened, the obtained wood has excellent performance and extremely high popularization and application values.

Description

Modified wood and preparation method and application thereof
Technical Field
The invention relates to modified wood, a preparation method and application of the modified wood.
Background
With the continuous enhancement of the protection of natural forests, the forest felling is rapidly changed from natural forests to artificial forests. However, some poor quality tree species such as larch, camphor tree, birch, masson pine, etc. in the artificial forest are not utilized efficiently. In order to realize effective allocation of artificial forest wood resources, the modification of artificial forest wood is more and more important. Therefore, the emphasis of wood modification in China in the future still resists the high-grade wood, improves the utilization rate of wood in the aspects of improving the density and the strength of wood, improving the dimensional stability of wood and the like, and prolongs the service life of wood.
The traditional wood modification technology mainly comprises other wood modification methods such as wood plastic combination, wood impregnation, wood heat treatment, wood acetylation and the like. Among the above methods, the impregnation method is the most common method in the wood modification process, and the method is mainly used for effectively introducing impregnation liquid into the wood under the action of pressure so as to improve the performance of the wood. The most common impregnation substances for strengthening wood by an impregnation method are mainly resins, and commonly used resins include phenolic resins, urea-formaldehyde resins, sugar alcohol resins, resorcinol resins and the like. However, these resins are organic and are prone to aging, which adversely affects the volume stability of the wood.
At present, relatively few cases exist for improving the performance of wood by using pure inorganic cementing materials, and most modification methods are to modify wood by using an inorganic and organic composite system. Application number 201611043422.2 provides a method for modifying wood, which comprises dissolving aluminum sol, silica coupling agent KH550 and polyethylene glycol 400 in water to obtain a treating solution, and sequentially vacuum-pressurizing and impregnating with dilute water glass solution to obtain modified fir with good dimensional stability, anti-shrinkage coefficient up to 34.21, and stability coefficient up to 80%. Besides the reduction of impact toughness, other indexes, such as bending strength, bending elasticity modulus, grain-following compression strength and hardness, are all improved. Meanwhile, application number 201910763496.0 proposes that the wood modifier compounded by polyethylene glycol (molecular weight 400-2000) and silica sol is used to improve the wood performance, and the dimensional stability, thermal performance, durability and the like of the modified wood are all improved. In addition, application No. 201811069590.8 proposes that the mechanical property of the obtained modified wood is improved and the wood has flame-retardant and smoke-suppressing properties after the wood modifier prepared from polyvinyl alcohol with molecular weight of 1700-2500, sodium silicate, silicon dioxide, magnesium oxide, aluminum oxide, zinc oxide, aluminum silicate and water is subjected to dipping treatment. Application number 201410292544.X proposes a wood modifier prepared by adopting aqueous silica sol, amino silicone oil, deionized water and a nonionic surfactant, and the performance of the impregnated wood is improved.
However, the modifier contains organic components which are easily volatilized and lost in the long-term service process, and the durability of the wood is adversely affected. It is therefore important to find stable inorganic binders to improve wood properties.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a modified wood and a preparation method thereof, and the method can mineralize wood, improve the density and the dimensional stability of the wood and optimize the mechanical property of the wood.
In order to solve the above technical problems, a first aspect of the present invention provides a modified wood, including a wood body and calcium silicate hydrate gel located in pores of the wood body.
According to some embodiments of the invention, the wood body is derived from one or more of poplar, camphorwood, willow and masson pine.
According to some embodiments of the invention, the density of the wood body is 0.4g/cm3～0.6g/cm3。
The second aspect of the present invention provides a method for preparing modified wood, comprising the steps of:
1) introducing the component A into pores of a wood body to obtain wood loaded with the component A;
2) and introducing the component B into the pores of the wood loaded with the component A, and reacting the component B with the component A in the pores to generate calcium silicate hydrate gel.
According to some embodiments of the present invention, component A comprises one or more of a silica sol solution having a solid content of 10 to 30%, a sodium silicate solution having a solid content of 50 to 80%, and a potassium silicate solution having a solid content of 50 to 80%.
According to some embodiments of the present invention, the silica sol has a pH of 8.5 to 10.5 and a density of 1.8 to 2.3g/cm3The particle size is 10-30 nm.
According to some embodiments of the invention, component B comprises Ca (OH)2Solution of CaCl2Solution and Ca (NO)3)2One or more of the solutions, preferably saturated Ca (OH)2Solution of saturated CaCl2Solution and saturated Ca (NO)3)2One or more of the solutions.
According to some embodiments of the invention, the moisture content of the wood body is below 15%, preferably below 10%, more preferably below 5%.
According to some embodiments of the invention, in step 1), component a is introduced into the pores of the wood body by negative pressure impregnation.
According to some embodiments of the invention, in step 1), the negative pressure is-0.05 MPa to-0.1 MPa, preferably-0.08 MPa to-0.1 MPa, as measured by vacuum gauge pressure.
According to some embodiments of the invention, step 1) comprises:
1a) keeping the wood for 0.5-6h under negative pressure;
1b) impregnating the wood treated in step 1a) with component a.
According to some embodiments of the invention, step 1a) is carried out at a temperature of 25 to 60 ℃, preferably 30 to 50 ℃.
According to some embodiments of the invention, in step 1b), the impregnation pressure is 0.4-2.3 MPa; in some embodiments, the pressure of the impregnation in step 1b) is from 0.8 to 1.5 MPa.
According to some embodiments of the invention, in step 1b), the impregnation temperature is between 30 and 50 ℃ and/or the time is between 4 and 12h, preferably between 6 and 10 h.
According to some embodiments of the invention, the preparation method further comprises drying the wood loaded with component a, preferably to a moisture content of less than 10%.
According to some embodiments of the invention, in step 2), component B is introduced into the pores of the wood body supporting component a by negative pressure impregnation.
According to some embodiments of the invention, in step 2), the negative pressure is-0.05 MPa to-0.1 MPa, preferably-0.08 MPa to-0.1 MPa, as measured by vacuum gauge pressure.
According to some embodiments of the invention, step 2) comprises:
2a) maintaining the wood loaded with the component A under negative pressure for 1-5h, preferably 2-4 h;
2b) impregnating the wood treated in step 2a) with component B.
According to some embodiments of the invention, step 2a) is carried out at a temperature of 25 to 60 ℃, preferably 30 to 50 ℃.
According to some embodiments of the invention, the pressure of the impregnation in step 2b) is 0.6 to 2.2MPa, and in some embodiments, the pressure of the impregnation in step 2b) is 0.8 to 1.6 MPa.
According to some embodiments of the invention, the temperature of the impregnation in step 2b) is between 25 and 60 ℃, preferably between 30 and 55 ℃; and/or for a period of 4 to 24 hours, preferably 5 to 20 hours.
According to some embodiments of the invention, the method further comprises drying the wood after the treatment of step 2).
According to some embodiments of the invention, the drying conditions comprise negative pressure, more preferably vacuum gauge pressure of-0.05 MPa to-0.1 MPa, preferably-0.08 MPa to-0.1 MPa; the drying may be carried out at a temperature of 25-75 ℃. According to some embodiments, the drying time is 2-4 h.
The wood modifier mainly comprises a component A and a component B. Wherein the component A is mainly silica sol and silicate with high solubility; the component B is mainly Ca (OH)2And calcium salts with high solubility. The A, B components are sequentially impregnated into the wood by impregnation means, when the A component provides Silicate Ions (SiO)3 2-) With calcium ions (Ca) provided by component B2+) After meeting, the gel reacts to generate hydrated calcium silicate gel (C-S-H gel), which is the main gel generated by the hydration of silicate cement, has good cementing property, mechanical property and the like, and cements fibers in the wood to mineralize the wood, improve the mechanical property of the wood and improve the density of the wood.
In the preparation method of the modified wood, the adding sequence of the component A and the component B is not limited, and the wood can be modified by adding the component A or the component B first.
The third aspect of the invention provides an application of the modified wood in indoor decoration, wooden furniture and building groups taking wood as a structure.
The invention has the beneficial effects that:
1. according to the invention, two inorganic ions capable of reacting enter the interior of the wood in sequence by means of impregnation, so that inorganic gel with good cementing property, stable size and good mechanical property is generated and is mutually cemented with fibers in the wood, thereby mineralizing the wood and improving the performance of the wood.
2. The wood strengthening method provided by the invention solves the problems that the durability of wood is poor and the like caused by aging, loss and the like of organic matters such as resin glue and the like in the later strengthening period of wood in the prior art. Meanwhile, the method for strengthening the wood by adopting the inorganic components provided by the invention is energy-saving and environment-friendly. And after the wood is strengthened, the obtained wood has excellent and stable performance and extremely high popularization and application values.
Detailed Description
The invention is further illustrated by the following examples.
To further exhibit the effects of the present invention, the silica sol solution in the following group A and Ca (OH) in the following group B2The solution is used as an example, the strengthening treatment is carried out on low-density poplar with the size of 20cm multiplied by 10cm multiplied by 3cm, and the specific application case further details the invention as follows.
Example 1
(1) Wood pretreatment: before dipping, the low-density poplar wood with the size of 20cm multiplied by 10cm multiplied by 3cm is put into an oven with the temperature of 65 ℃ for drying until the water content is less than 10 percent.
(2) Taking out the poplar dried in the step (1), placing the poplar in a dipping tank, adjusting the pressure in the tank to be negative pressure of-0.09 MPa, and keeping for 2 hours. And then, injecting silica sol with the solid content of 10% into the tank, filling the tank body with the silica sol, adjusting the pressure in the tank to 1.0MPa, and keeping for 6 hours to ensure that the silica sol solution fully enters the interior of the wood. And releasing the pressure to discharge the excessive silica sol solution in the tank.
(3) And (3) taking out the poplar dipped in the silica sol solution in the step (2), and drying the poplar in a drying oven at the temperature of 65 ℃ until the water content is less than 10%.
(4) Taking out the poplar dried in the step (3), placing the poplar in a dipping tank, regulating the pressure in the tank to be negative pressure of-0.09 MPa, and keeping the pressure for 2 hours. Then saturated Ca (OH)2Injecting the solution into the tank, filling the tank with the solution, adjusting the pressure in the tank to 1.0MPa, and maintaining at 50 deg.C for 6 hr to saturate Ca (OH)2And (3) fully introducing the solution into the poplar wood, and fully reacting with the silica sol impregnated in the step (2). Releasing the pressure to remove the excess Ca (OH) in the tank2The solution was drained.
(5) And (4) carrying out vacuum drying treatment on the poplar soaked in the step (4), adjusting the temperature of a vacuum soaking tank to 65 ℃, adjusting the pressure in the vacuum tank to negative pressure of-0.08 MPa, keeping the temperature and the pressure in the vacuum tank, and carrying out vacuum drying until the water content of the poplar is less than 10% to obtain the required reinforced wood.
Example 2
(1) Wood pretreatment: before dipping, the low-density poplar wood with the size of 20cm multiplied by 10cm multiplied by 3cm is put into an oven with the temperature of 65 ℃ for drying until the water content is less than 10 percent.
(2) Taking out the poplar dried in the step (1), placing the poplar in a dipping tank, adjusting the pressure in the tank to be negative pressure of-0.09 MPa, and keeping for 2 hours. And then, injecting the silica sol with the solid content of 15% into the tank, filling the tank body with the silica sol, adjusting the pressure in the tank to 1.0MPa, and keeping for 6 hours to ensure that the silica sol solution fully enters the interior of the wood. And releasing the pressure to discharge the excessive silica sol solution in the tank.
(3) And (3) taking out the poplar dipped in the silica sol solution in the step (2), and drying the poplar in a drying oven at the temperature of 65 ℃ until the water content is less than 10%.
(4) Taking out the poplar dried in the step (3), placing the poplar in a dipping tank, regulating the pressure in the tank to be negative pressure of-0.09 MPa, and keeping the pressure for 2 hours. Then saturated Ca (OH)2Injecting the solution into the tank, filling the tank with the solution, adjusting the pressure in the tank to 1.0MPa, and maintaining at 50 deg.C for 8 hr to saturate Ca (OH)2The solution fully enters the inside of the poplar, andand (3) fully reacting the silica sol impregnated in the step (2). Releasing the pressure to remove the excess Ca (OH) in the tank2The solution was drained.
(5) And (4) carrying out vacuum drying treatment on the poplar soaked in the step (4), adjusting the temperature of a vacuum soaking tank to 65 ℃, adjusting the pressure in the vacuum tank to negative pressure of-0.08 MPa, keeping the temperature and the pressure in the vacuum tank, and carrying out vacuum drying until the water content of the poplar is less than 10% to obtain the required reinforced wood.
Example 3
(1) Wood pretreatment: before dipping, the low-density poplar wood with the size of 20cm multiplied by 10cm multiplied by 3cm is put into an oven with the temperature of 65 ℃ for drying until the water content is less than 10 percent.
(2) Taking out the poplar dried in the step (1), placing the poplar in a dipping tank, adjusting the pressure in the tank to be negative pressure of-0.09 MPa, and keeping for 2 hours. And then, injecting silica sol with the solid content of 25% into the tank, filling the tank body with the silica sol, adjusting the pressure in the tank to 1.0MPa, and keeping for 6 hours to ensure that the silica sol solution fully enters the interior of the wood. And releasing the pressure to discharge the excessive silica sol solution in the tank.
(3) And (3) taking out the poplar dipped in the silica sol solution in the step (2), and drying the poplar in a drying oven at the temperature of 65 ℃ until the water content is less than 10%.
(4) Taking out the poplar dried in the step (3), placing the poplar in a dipping tank, regulating the pressure in the tank to be negative pressure of-0.09 MPa, and keeping the pressure for 2 hours. Then saturated Ca (OH)2Injecting the solution into the tank, filling the tank with the solution, adjusting the pressure in the tank to 1.0MPa, and maintaining at 50 deg.C for 10 hr to saturate Ca (OH)2And (3) fully introducing the solution into the poplar wood, and fully reacting with the silica sol impregnated in the step (2). Releasing the pressure to remove the excess Ca (OH) in the tank2The solution was drained.
(5) And (4) carrying out vacuum drying treatment on the poplar soaked in the step (4), adjusting the temperature of a vacuum soaking tank to 65 ℃, adjusting the pressure in the vacuum tank to negative pressure of-0.08 MPa, keeping the temperature and the pressure in the vacuum tank, and carrying out vacuum drying until the water content of the poplar is less than 10% to obtain the required reinforced wood.
Example 4
(1) Wood pretreatment: before dipping, the low-density poplar wood with the size of 20cm multiplied by 10cm multiplied by 3cm is put into an oven with the temperature of 65 ℃ for drying until the water content is less than 10 percent.
(2) Taking out the poplar dried in the step (1), placing the poplar in a dipping tank, adjusting the pressure in the tank to be negative pressure of-0.09 MPa, and keeping for 2 hours. Then, silica sol with the solid content of 30 percent is injected into the tank and filled in the tank body, the pressure in the tank is adjusted to 1.0MPa, and the pressure is kept for 6 hours at the temperature of 50 ℃, so that the silica sol solution fully enters the interior of the wood. And releasing the pressure to discharge the excessive silica sol solution in the tank.
(3) And (3) taking out the poplar dipped in the silica sol solution in the step (2), and drying the poplar in a drying oven at the temperature of 65 ℃ until the water content is less than 10%.
(4) Taking out the poplar dried in the step (3), placing the poplar in a dipping tank, regulating the pressure in the tank to be negative pressure of-0.09 MPa, and keeping the pressure for 2 hours. Then saturated Ca (OH)2Injecting the solution into the tank, filling the tank, adjusting the pressure in the tank to 1.0MPa, maintaining for 12 hr to saturate Ca (OH)2And (3) fully introducing the solution into the poplar wood, and fully reacting with the silica sol impregnated in the step (2). Releasing the pressure to remove the excess Ca (OH) in the tank2The solution was drained.
(5) And (4) carrying out vacuum drying treatment on the poplar soaked in the step (4), adjusting the temperature of a vacuum soaking tank to 65 ℃, adjusting the pressure in the vacuum tank to negative pressure of-0.08 MPa, keeping the temperature and the pressure in the vacuum tank, and carrying out vacuum drying until the water content of the poplar is less than 10% to obtain the required reinforced wood.
The flexural strength, weight gain, density, dimensional stability, etc. of the above-described examples 1, 2, 3, 4, comparative example 1, and untreated poplar boards were tested, and the results are shown in table 1.
TABLE 1 sheet Performance index
Figure BDA0002319789160000071
As can be seen from the results of table 1: after the treatment by the method, the bending strength, the weight gain ratio, the density, the dimensional stability and the like of the plates obtained in the examples 1 to 4 are superior to those of untreated poplar plates in all aspects. The results show that: by the impregnation method, inorganic ions enter the interior of the wood, react with each other to generate inorganic glue, and the inorganic glue is glued with fibers in the wood, so that the method for mineralizing the wood and improving the performance of the wood has strong feasibility. And the prepared plate has excellent performance, is environment-friendly and healthy, and has extremely high popularization and use values.
Examples 5 to 8
The present set of examples 5-8 differs from example 4 in that: in example 5, the component a is a silica sol with a solid content of 30% and a sodium silicate solution with a solid content of 60%, and the volume ratio is 1: 1; in example 6, the component a is a silica sol having a solid content of 30% and a potassium silicate solution having a solid content of 60%, in a volume ratio of 1: 1; in example 7, the component a is a silica sol having a solid content of 30%, a sodium silicate solution having a solid content of 70%, and a potassium silicate solution having a solid content of 70%, in a volume ratio of 1: 1: 1; in example 8, the component a is a sodium silicate solution with a solid content of 75% and a potassium silicate solution with a solid content of 75%, in a volume ratio of 1: 1.
the bending strength, the weight gain ratio, the density, the dimensional stability and the like of the boards prepared by the embodiments 5 to 8 of the technical scheme of the invention and the untreated poplar templates were tested according to the standard of 2013 physicochemical property test methods for artificial boards and veneers in the national standard GB/T17657, and the results are shown in Table 2.
TABLE 2 Wood Performance index test results
Figure BDA0002319789160000081
Table 2 the results show that: after the technical scheme of the invention is adopted to modify wood, the performance of the wood obtained in the examples 5-8 is superior to that of untreated poplar. However, the wood obtained in examples 5 to 8 had a lower overall performance than that of example 4, when the type and amount of the substances in component A were changed.
Examples 9 to 12
The present set of examples 9-12 differs from example 4 in that: the component B is different, and the component B in the example 9 is a saturated calcium chloride solutionExample 10, in which the component B was a saturated calcium nitrate solution, example 11 was saturated Ca (OH)2Solution + saturated calcium chloride solution in a volume ratio of 1: 1; example 12 is a saturated calcium chloride solution + saturated calcium nitrate solution, in a volume ratio of 1: 1.
the bending strength, the weight gain ratio, the density, the dimensional stability and the like of the boards prepared by the embodiments 9-12 and the untreated poplar templates of the technical scheme of the invention are tested according to the national standard GB/T17657-2013 physicochemical property test method for artificial boards and veneers, and the results are shown in Table 3.
TABLE 3 Wood Performance index test results
Figure BDA0002319789160000082
Figure BDA0002319789160000091
Table 3 the results show that: after the method is adopted to modify the wood, compared with an untreated sample, the indexes of the wood in all aspects are improved to a great extent. However, the combination property index of the wood is reduced compared with that of example 4 after the variety and the dosage of the substances in the component B are changed.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not set any limit to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.

Claims (10)

1. A modified wood comprising a wood body and a calcium silicate hydrate gel located in pores of the wood body.
2. Modified wood according to claim 1,
the wood body is one or more of poplar, camphorwood, willow and masson pine; and/or the density of the wood body is 0.4g/cm3～0.6g/cm3。
3. A preparation method of modified wood comprises the following steps:
1) introducing the component A into pores of a wood body to obtain wood loaded with the component A;
2) and introducing the component B into the pores of the wood loaded with the component A, and reacting the component B with the component A in the pores to generate calcium silicate hydrate gel.
4. The preparation method according to claim 3, wherein the component A comprises one or more of a silica sol solution with a solid content of 10-30%, a sodium silicate solution with a solid content of 50-80% and a potassium silicate solution with a solid content of 50-80%; said component B comprises Ca (OH)2Solution of CaCl2Solution and Ca (NO)3)2One or more of the solutions, preferably saturated Ca (OH)2Solution of saturated CaCl2Solution and saturated Ca (NO)3)2One or more of the solutions.
5. A method as claimed in claim 3 or 4, wherein the moisture content of the wood body is less than 15%, preferably less than 10%.
6. A method according to any one of claims 3-5, characterized in that in step 1), component A is introduced into the pores of the wood body by negative pressure impregnation, preferably step 1) comprises:
1a) maintaining the wood under negative pressure for 0.5-6h, preferably the negative pressure is-0.05 MPa to-0.1 MPa, preferably a vacuum gauge pressure of-0.08 MPa to-0.1 MPa;
1b) impregnating the wood treated in step 1a) in component a, preferably under conditions comprising: the pressure is 0.4-2.3MPa, preferably 0.8-1.5 MPa; the temperature is 30-50 ℃ and the time is 4-12 h.
7. A method according to any one of claims 3 to 6, characterized in that the method further comprises drying the wood loaded with component A, preferably to a moisture content of less than 10%.
8. A method according to any one of claims 3-7, characterized in that in step 2), component B is introduced into the pores of the wood body supporting component A by negative pressure impregnation, preferably step 2) comprises:
2a) maintaining the wood loaded with the component A for 1-5h under vacuum gauge pressure of-0.05 MPa to-0.1 MPa, preferably-0.08 MPa to-0.1 MPa;
2b) immersing the wood treated in the step 2a) in the component B, wherein the immersing conditions comprise: the pressure is 0.6-2.2MPa, preferably 0.8-1.6 MPa; the temperature is 25-60 ℃ and the time is 4-24 h.
9. The method of any one of claims 3-8, further comprising drying the wood after the treatment of step 2), preferably wherein the drying is performed under negative pressure conditions, more preferably wherein the negative pressure is a vacuum gauge pressure of-0.05 MPa to-0.1 MPa, preferably-0.08 MPa to-0.1 MPa; and/or the temperature of the drying is 25-75 ℃, preferably 30-65 ℃; the time is 2-4 h.
10. Use of the modified wood according to claim 1 or 2 or the modified wood prepared by the method according to any one of claims 3 to 9 in interior decoration, high-grade wood furniture, automobile decoration, music equipment such as piano, and building groups using wood as a structure.
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CN112356194A (en) * 2020-10-13 2021-02-12 广东环境保护工程职业学院 Wood preservation method and application thereof in wood product processing
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CN115180630A (en) * 2022-05-13 2022-10-14 山东宙雨消防科技股份有限公司 Preparation method of sodium silicate aqueous solution fire retardant

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