CN114633330A - Ultrahigh-strength wood and preparation method thereof - Google Patents

Ultrahigh-strength wood and preparation method thereof Download PDF

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Publication number
CN114633330A
CN114633330A CN202210287174.5A CN202210287174A CN114633330A CN 114633330 A CN114633330 A CN 114633330A CN 202210287174 A CN202210287174 A CN 202210287174A CN 114633330 A CN114633330 A CN 114633330A
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wood
reinforcing agent
low
drying
strength
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CN114633330B (en
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李改云
郭登康
傅峰
储富祥
杨昇
耿奥博
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Research Institute of Wood Industry of Chinese Academy of Forestry
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Research Institute of Wood Industry of Chinese Academy of Forestry
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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
    • 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
    • B27K3/34—Organic impregnating agents
    • B27K3/50—Mixtures of different organic 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
    • B27K5/001—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing

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

Abstract

The invention relates to the technical field of wood modification, in particular to ultrahigh-strength wood and a preparation method thereof; the method comprises the following steps: (1) performing hot-pressing treatment on the softened wood to control the compression ratio of the wood to be 10% -50%, and then performing first drying; (2) and (2) impregnating the wood obtained in the step (1) with the reinforcing agent, curing, and then carrying out secondary drying to obtain the ultrahigh-strength wood. According to the invention, through carrying out hot pressing treatment on the wood, the pore size and density distribution of the wood and the shape of the wood can be controlled by regulating the compression ratio of the wood, the distribution of the immersion amount of the reinforcing agent is regulated, the specific mechanical property can be effectively improved, and various mechanical properties of the wood can be synchronously improved. The method has the advantages that the wood is not required to be subjected to component removal treatment, the generation of redundant waste and chemical waste liquid in the component removal process is avoided, the carbon fixation characteristic of the wood is reserved, and the method is more green and environment-friendly.

Description

Ultrahigh-strength wood and preparation method thereof
Technical Field
The invention relates to the technical field of wood modification, in particular to ultrahigh-strength wood and a preparation method thereof.
Background
Wood is a renewable natural material and is widely used as a building material and a furniture material. However, the application of wood in high-end building materials is less, and the main factor is that the mechanical properties of wood are far from the same as those of metal materials such as alloy steel.
The preparation of wood materials with high mechanical strength has been reported, and the bending strength of the wood materials prepared by performing delignification treatment on wood firstly, and then performing resin impregnation and compression processes disclosed in CN112077954A and CN108772922A can exceed 300MPa and is higher than that of certain alloy materials. However, for wood with large thickness (above 2 cm), achieving efficient uniform treatment of lignin is still a great difficulty. In addition, the delignification process generates lignin waste and a large amount of delignification enhancer waste, thereby increasing environmental pollution.
The mechanical property of the wood can be improved to a certain extent by directly compressing the wood, but the strength of the compressed wood is far less than that of a metal material. In contrast, in the methods reported in CN 1333113a and CN 103659972A, the wood is subjected to resin impregnation treatment and then to compression treatment, and due to the combined action of the resin and the compression treatment, the mechanical properties of the wood material are improved more significantly. However, the hot press treatment after the resin impregnation has two problems. The resin which is firstly soaked into the wood is partially extruded in the compression process, and the resin is quickly solidified and volatilized due to the action of heat and cannot be recycled, so that the waste of the resin is caused, and the generation cost is increased. Secondly, due to the solidification of the resin in the hot pressing process, the rigidity of the wood is increased, the shaping difficulty of the wood is increased, and the wood can only be compressed integrally without difference.
CN 107263657A and CN 109366656A report that the effect of layered compression or asymmetric compression on improving specific mechanical properties of wood is better, but these compression methods cannot be realized due to the advanced introduction of resin.
Disclosure of Invention
In view of the problems of the prior art, including the problems that the high-strength wood material is required to be delignified or the resin is partially not recycled, so that waste is caused, or the molding difficulty of the wood is high, the preparation method of the ultrahigh-strength wood is provided, the mechanical property of the wood can be effectively enhanced, particularly, the specific mechanical property is effectively improved, and the preparation method of the ultrahigh-strength wood is green and environment-friendly.
In order to achieve the above object, a first aspect of the present invention provides a method for preparing an ultra-high strength wood, the method comprising the steps of:
(1) carrying out hot pressing treatment on the softened wood, controlling the compression ratio of the wood to be 10% -50%, and then carrying out first drying;
(2) and (2) impregnating the wood obtained in the step (1) with the reinforcing agent, curing, and then carrying out secondary drying to obtain the ultrahigh-strength wood.
In a second aspect, the invention provides an ultra-high strength wood prepared by the preparation method.
The invention relates to a novel method for preparing a high-strength wood material by compressing wood and then processing a reinforcing agent, which can regulate and control the porosity of the wood by adjusting the compression ratio of the wood in the hot-pressing treatment process, and then immerses the reinforcing agent in the compressed wood, so that the reinforcing agent forms a high-molecular polymer by in-situ polymerization, thereby further enhancing the mechanical property of the wood and fixing the shape of the wood. The mechanical property of the ultrahigh-strength wood prepared by the method is obviously superior to that of untreated wood and pure compressed wood, the bending strength of the ultrahigh-strength wood exceeds that of certain alloy materials, the specific strength of the ultrahigh-strength wood is more than 8 times that of steel alloy, and the ultrahigh-strength wood can effectively prevent water from entering and obviously improve the dimensional stability of wood materials by forming high-molecular polymers in the compressed wood.
In a preferred embodiment of the invention, the cellular cavity reactive reinforcing agent (e.g. epoxy-based reinforcing agent and/or ethylene-based reinforcing agent) is selected at impregnation to ensure smooth penetration of the reinforcing agent in the compressed wood and to avoid spring back of the compressed wood at impregnation. Preferably, to ensure better penetration of the reinforcing agent, impregnation with a reinforcing agent of low viscosity may be used, or an organic solvent may be used to reduce the viscosity of the treatment system, so as to avoid rebound of the compressed wood, the reinforcing agent should not penetrate into the wood cell walls, and water should not be used as a solvent.
Compared with the prior art, the preparation method does not need to carry out component removal treatment on the wood, avoids the generation of redundant waste and chemical waste liquid in the component removal process, retains the carbon fixation characteristic of the wood, is more green and environment-friendly, and can store redundant reinforcing agents which are not impregnated into the wood for next batch of impregnation without wasting the reinforcing agents.
According to the preparation method, the wood is subjected to hot pressing treatment, the pore size and density distribution of the wood and the shape of the wood can be controlled by regulating the compression ratio of the wood, the distribution of the impregnation amount of the reinforcing agent is regulated, specific mechanical properties can be effectively improved, and various mechanical properties of the wood can be synchronously improved. By adopting the preparation method provided by the invention, the mechanical property of the wood can be effectively improved under the condition of lower weight gain rate of the wood.
Drawings
Fig. 1(a) is a sectional view of an ultra-high strength wood prepared in example 2 of the present invention, fig. 1(b) is a sectional view of an ultra-high strength wood prepared in example 3 of the present invention, and fig. 1(c) is a sectional view of an ultra-high strength wood prepared in example 1 of the present invention.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In the present invention, the compression ratio refers to: (thickness value of wood before hot pressing-thickness value of wood after hot pressing)/thickness value of wood before hot pressing.
Porosity is the percentage of pores in the wood that make up the total volume of the material.
According to a first aspect of the present invention, there is provided a method of producing an ultra-high strength wood, the method comprising the steps of:
(1) carrying out hot pressing treatment on the softened wood, controlling the compression ratio of the wood to be 10-50%, and then carrying out first drying;
(2) and (2) impregnating the wood obtained in the step (1) with a reinforcing agent, curing, and then performing secondary drying to obtain the ultrahigh-strength wood.
The preparation method provided by the invention adjusts the compression ratio of the wood in the hot pressing process, then immerses the reinforcing agent in the compressed wood, and in-situ polymerization enables the reinforcing agent to form a high molecular polymer, so that the mechanical property of the wood is further enhanced and the shape of the wood is fixed. The method can effectively enhance the mechanical property of the wood, can effectively improve the specific mechanical property, and is environment-friendly.
In the invention, the compression ratio of the wood is selectively controlled by the thickness of the thickness gauge, and the bending degree of the wood can be controlled by the moulds in different shapes.
According to a preferred embodiment of the invention, the porosity of the wood is reduced by 30% to 5% after the autoclaving.
According to a preferred embodiment of the invention, after the autoclaving, the wood comprises a high-density layer and a low-density layer, the density of the high-density layer preferably being in the range from 0.7 to 1.2g/cm3The density of the low-density layer is in the range of 0.3-0.7g/cm3. Is favorable for fully exerting the sharing effect of the wood matrix on the mechanical load.
In the present invention, the high-density layer of wood subjected to surface layer compression is distributed on the surface, the high-compression layer of wood subjected to single-surface layer compression is distributed on the single surface, and the high-compression layer of the core layer compressed wood is distributed in the middle. In the invention, the temperature of the upper pressing plate and the lower pressing plate of the press and the preheating time can be controlledThe pore and density distribution of the wood are controlled, and the high compression layer (the density is 0.7-1.2 g/cm)3) And a low compression layer (density of 0.3-0.7 g/cm)3) The distribution of the impregnation amount of the reinforcing agent can be regulated and controlled, and the specific mechanical property can be effectively improved.
In the present invention, the conditions of the softening treatment are not particularly limited, and the object of the present invention can be achieved by any of the conventional methods and conditions for softening wood in the art, and preferably, the conditions of the softening treatment include: soaking the wood in water for 2-24 h; more preferably, the coating is soaked in water at normal temperature.
According to the present invention, the compression ratio of the wood is adjusted by hot pressing, and the hot pressing conditions are not particularly limited as long as the compression ratio of the present invention can be achieved, and for the present invention, it is preferable that the hot pressing conditions include: the hot pressing temperature is 120-; is favorable for enhancing the mechanical property of the wood.
According to a preferred embodiment of the present invention, the moisture content of the wood after the first drying is 5% by weight or less; preferably, the first drying conditions include: the drying temperature is 60-105 ℃, and the drying time is 6-24 h.
In the present invention, there is no particular limitation in the impregnation process of the reinforcing agent, as long as the reinforcing agent can be impregnated into the hot-pressed wood, and the objects of the present invention can be achieved by the conventional impregnation method in the art.
According to a preferred embodiment of the present invention, the reinforcing agent impregnation process comprises: vacuum impregnation is followed by pressure impregnation.
In the present invention, the vacuum impregnation conditions and the pressure impregnation conditions are not particularly limited as long as the reinforcing agent can be impregnated into the hot-pressed wood, and for the present invention, preferably, the vacuum impregnation conditions include: the pressure is-0.50 to 0.1MPa, and the dipping time is 0.5 to 2 hours; the pressure impregnation conditions include: the dipping time is 4-24h under the pressure of 0.5-1.5 MPa; is favorable for enhancing the mechanical property of the wood.
In the present invention, the curing conditions are not particularly limited as long as they can polymerize the reinforcing agent impregnated in the wood, and preferably, the curing conditions include: heating at 60-140 deg.C for 6-24 h; more preferably, the heating is carried out for 6 to 12 hours at the temperature of between 60 and 80 ℃, and then the heating is carried out for 8 to 12 hours at the temperature of between 120 and 140 ℃; is favorable for enhancing the mechanical property of the wood.
According to a preferred embodiment of the invention, the curing conditions further comprise aging the impregnated reinforcement wood at room temperature, preferably at 20-30 ℃ for 24-48 h; at the temperature of 60-80 ℃, even at room temperature, the reinforcing agent is prepolymerized and then heated for curing, which is favorable for further enhancing the mechanical properties of the wood.
According to a preferred embodiment of the present invention, the moisture content of the wood after the second drying is 12% by weight or less; preferably, the second drying conditions include: the drying temperature is 60-105 ℃, and the drying time is 6-24 h.
In the present invention, the enhancer is not particularly limited, and conventional enhancers in the art can achieve the object of the present invention, and preferably, the enhancer is a cell cavity reaction type enhancer, for example, an epoxy-based enhancer and/or a vinyl-based enhancer.
According to a preferred embodiment of the present invention, the epoxy-based reinforcing agent includes a low viscosity epoxy component and a curing agent; the low-viscosity epoxy component is selected from at least one of 1, 4-butanediol diglycidyl ether, glycerol triglycidyl ether, trimethylolpropane triglycidyl ether, acrylic acid glycidyl ether, methacrylic acid glycidyl ether, polyethylene glycol diglycidyl ether and bisphenol A epoxy resin, preferably, the viscosity of the low-viscosity epoxy component is 1-50mPa & s, and a reinforcing agent with low viscosity is selected for impregnation to ensure better penetration of the reinforcing agent, so that the mechanical property of wood is favorably enhanced.
The type of the curing agent is not particularly limited in the present invention, and any curing agent that is conventional in the art can achieve the object of the present invention, and the curing agent of the epoxy component may be at least one of epoxy anhydride curing agents such as phthalic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, glutaric anhydride, nadic anhydride, methylnadic anhydride, and tung oil anhydride, or may be at least one of epoxy amine curing agents such as m-phenylenediamine, diaminodiphenylmethane, isophoronediamine, and diaminodiphenylsulfone.
According to a preferred embodiment of the present invention, the epoxy-based reinforcing agent further includes one or both of an accelerator and a first organic solvent.
According to a preferred embodiment of the present invention, the accelerator is selected from at least one of 2,4, 6-tris (dimethylaminomethyl) phenol, 2-methylimidazole, methylimidazole and triethanolamine.
According to a preferred embodiment of the present invention, the first organic solvent is selected from at least one of anhydrous ethanol, acetone, and tetrahydrofuran; the reinforcing agent needs to avoid penetrating into the cell wall of the wood, water can not be used as a solvent, the viscosity of a treatment system can be reduced by adding an organic solvent, and meanwhile, the resilience of compressed wood can be avoided, so that the mechanical property of the wood is favorably enhanced.
According to a preferred embodiment of the invention, the curing agent is used in an amount of 10% to 100% by weight of the low-viscosity epoxy component, which is advantageous for enhancing the mechanical properties of the wood.
According to a preferred embodiment of the present invention, the ethylenic enhancer comprises an ethylenic monomer and an initiator.
According to a preferred embodiment of the present invention, the vinyl monomer is at least one selected from the group consisting of methyl methacrylate, methyl acrylate, styrene, glycidyl methacrylate, allyl glycidyl ether, hydroxypropyl methacrylate, dimethylaminoethyl methacrylate, ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, propylene glycol dimethacrylate, polypropylene glycol dimethacrylate, acrylonitrile, vinyl acetate, methacrylamide, isobutyl vinyl ether, allyl chloride and p-chlorostyrene monomers.
In the present invention, the initiator is not particularly limited, and conventional initiators in the art can achieve the object of the present invention, and preferably, the initiator is selected from azobisisobutyronitrile and/or benzoyl peroxide.
According to a preferred embodiment of the present invention, the ethylene enhancer further comprises a second solvent selected from at least one of absolute ethanol, acetone and tetrahydrofuran; the reinforcing agent needs to avoid penetrating into the cell wall of the wood, water can not be used as a solvent, the viscosity of a treatment system can be reduced by adding an organic solvent, and meanwhile, the resilience of compressed wood can be avoided, so that the mechanical property of the wood is favorably enhanced.
In the present invention, the wood impregnated with the ethylene reinforcing agent is required to be covered with tinfoil to protect the wood and then to be cured by heating.
According to a preferred embodiment of the invention, the amount of the initiator is 0.5-2% of the mass of the vinyl monomer, which is beneficial to enhancing the mechanical property of the wood.
According to a second aspect of the present invention, the present invention provides an ultra-high strength wood produced by the production method according to the present invention. The mechanical property of the ultrahigh-strength wood is obviously superior to that of untreated wood and pure compressed wood, the bending strength of the ultrahigh-strength wood exceeds that of certain alloy materials, the specific strength of the ultrahigh-strength wood is more than 8 times that of steel alloy, and the ultrahigh-strength wood can effectively prevent water from entering and obviously improve the dimensional stability of wood materials by forming high-molecular polymers in the compressed wood.
The present invention will be described in detail below by way of examples.
In the following examples, high density layer density refers to a wood density in the range of 0.7-1.2g/cm3The high-density layer of (2), the low-density layer density means a wood density in the range of 0.3 to 0.7g/cm3The average density of the low compression layer of (a).
In the following examples, the room temperature was 23 to 27 ℃.
In the following examples, the ultra-high strength wood evaluation indexes and test conditions were as follows:
the test standards for flexural strength were: GB _ T1936-1-2009; the test standards for flexural modulus were: GB _ T1936-2-2009; the test standards for compressive strength are: GB 15777; the test criteria for impact toughness are: GB _ T1940-: GB _ T1941-2009.
Example 1
(1) Soaking poplar with thickness of 4cm in water for 2h for softening treatment(ii) a Placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 150 ℃, the preheating time is 30s, the thickness is calibrated to be 2cm by using a thickness gauge, the compression ratio is determined to be 50%, the press is closed, a press plate heating device is turned off, and the compression time is 6 h; the wood after the compression treatment is heated and treated for 6 hours in an oven at 103 ℃; the porosity of the wood is reduced by 30 percent, and the high-density layer of the wood is distributed on the surface layer (the density of the high-density layer is 0.93 g/cm)3The density of the low-density layer is 0.52g/cm3). The moisture content of the wood was 3 wt%.
(2) The mass ratio of the 1, 4-butanediol diglycidyl ether to the trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (viscosity of 12.2 mPas), adding 100% by mass of methyldischianhydride based on the low-viscosity epoxy component as a curing agent and 0.5% by mass of 2,4, 6-tris (dimethylaminomethyl) phenol based on the low-viscosity epoxy component as an accelerator, and uniformly mixing to obtain a reinforcing agent; immersing the wood obtained in the step (1) into a reinforcing agent liquid, carrying out vacuum impregnation for 60min under-1 MPa, and then carrying out pressure impregnation for 24h under 1.2 MPa; after the impregnation is completed, the reinforcing liquid on the surface of the sample is wiped dry and is aged at room temperature for one day.
(3) Putting the wood impregnated with the reinforcing agent into an oven for curing treatment, heating at 80 ℃ for 6h, and curing at 120 ℃ for 12 h; the cured wood was dried to constant weight at 103 ℃ with a moisture content of 8 wt%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1. FIG. 1(c) is an ultra-high strength wood prepared by example 1 of the present invention; the high-density layer of wood is distributed on the surface layer.
Example 2
(1) Soaking poplar with the thickness of 4cm in water for 2 hours for softening; and (3) placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 150 ℃, the preheating time is 600s, and the thickness is calibrated to be 2cm by using a thickness gauge to determine the compression ratio to be 50%. Closing the press, turning off the pressing plate heating device, and compressing for 6 h; heating the compressed wood in an oven at 103 ℃ for 6 hours; the porosity of the wood is reduced by 30 percent, and simultaneously the high-density layer of the wood is distributed in the central coreLayer (high Density layer Density of 0.91g/cm3The density of the low-density layer is 0.52g/cm3). The water content of the wood was 1 wt%.
(2) The mass ratio of the 1, 4-butanediol diglycidyl ether to the trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (viscosity of 12.2 mPas), adding 100% by mass of methyldischianhydride based on the low-viscosity epoxy component as a curing agent and 0.5% by mass of 2,4, 6-tris (dimethylaminomethyl) phenol based on the low-viscosity epoxy component as an accelerator, and uniformly mixing to obtain a reinforcing agent; immersing the wood obtained in the step (1) into a reinforcing agent liquid, vacuum-immersing for 60min under-1 Mpa, and then pressurizing and immersing for 24h under 1.2 Mpa; after the impregnation is finished, the modifying solution on the surface of the sample is wiped dry and is aged for one day at room temperature.
(3) Putting the wood impregnated with the reinforcing agent into an oven for curing treatment, heating at 80 ℃ for 6h, and curing at 120 ℃ for 12 h; the cured wood was dried to constant weight at 103 ℃ with a water content of 12 wt%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
Fig. 1(a) is an ultra-high strength wood prepared in example 2 of the present invention, in which a high density layer of wood is distributed in a core layer.
Example 3
(1) Soaking poplar with the thickness of 4cm in water for 2 hours for softening; and (3) placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate of the press is 150 ℃, the temperature of the lower press plate is room temperature, the preheating time is 30s, and the thickness is calibrated to be 2cm by using a thickness gauge to determine the compression ratio to be 50%. Closing the press, turning off the pressing plate heating device, compressing for 6h, and heating the compressed wood in an oven at 103 ℃ for 6 h; the porosity of the wood is reduced by 30 percent, and the high-density layer of the wood is distributed into a single surface layer (the density of the high-density layer is 0.92 g/cm)3The density of the low-density layer is 0.50g/cm3) The moisture content of the wood was 3 wt%.
(2) The mass ratio of 1, 4-butanediol diglycidyl ether to trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (viscosity of 12.2 mPas), adding 100% by mass of methyldischianhydride based on the low-viscosity epoxy component as a curing agent and 0.5% by mass of 2,4, 6-tris (dimethylaminomethyl) phenol based on the low-viscosity epoxy component as an accelerator, and uniformly mixing to obtain a reinforcing agent; immersing the wood obtained in the step (1) into a reinforcing agent liquid, carrying out vacuum impregnation for 60min under-1 Mpa, and then carrying out pressure impregnation for 24h under 1.2 Mpa. After the impregnation is completed, the reinforcing liquid on the surface of the sample is wiped dry and is aged at room temperature for one day.
(3) Putting the wood impregnated with the reinforcing agent into an oven for curing treatment, heating at 80 ℃ for 6h, and curing at 120 ℃ for 12 h; drying the cured wood at 103 ℃ to constant weight; the moisture content of the wood was 8 wt%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
FIG. 1(b) is a view showing a single surface layer of a high-density layer distribution of the ultrahigh-strength wood prepared in example 3 of the present invention.
Example 4
(1) Soaking poplar with the thickness of 4cm in water for 2 hours for softening; and (3) placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 150 ℃, the preheating time is 30s, and the thickness is calibrated to be 2cm by using a thickness gauge to determine the compression ratio to be 50%. Closing the press, turning off the pressing plate heating device, and compressing for 6 h; heating the compressed wood in an oven at 103 ℃ for 6 hours; the porosity of the wood is reduced by 30 percent, and the high-density layer of the wood is distributed on the surface layer (the density of the high-density layer is 0.93 g/cm)3The density of the low-density layer is 0.52g/cm3) The moisture content of the wood was 4 wt%.
(2) The mass ratio of methyl methacrylate to hydroxyethyl methacrylate is 2: 1, taking the mixture as an ethylene monomer, adding azodiisobutyronitrile which accounts for 1 percent of the mass of the ethylene monomer as an initiator, and uniformly mixing to obtain a reinforcing agent; immersing the wood obtained in the step (1) into a reinforcing agent liquid, carrying out vacuum impregnation for 60min under-1 Mpa, and then carrying out pressure impregnation for 24h under 1.2 Mpa. After the impregnation was completed, the reinforcing liquid on the surface of the sample was wiped dry, covered with tin foil, and left to stand at room temperature for one day.
(3) And (3) putting the wood impregnated with the reinforcing agent into an oven for curing treatment, heating at 80 ℃ for 6h, curing at 120 ℃ for 12h, removing the tinfoil, and heating at 103 ℃ for 6h, wherein the water content of the wood is 10 wt%.
The bending strength, compression strength, bending modulus, impact toughness, hardness, and weight gain of the treated wood were measured, and the results are shown in table 1.
Example 5
(1) Soaking poplar with the thickness of 4cm in water for 2 hours for softening; and (3) placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 150 ℃, the preheating time is 30s, the thickness is calibrated to be 3cm by a thickness gauge, and the compression ratio is 25%. Closing the press, turning off the pressing plate heating device, and compressing for 6 h; heating the compressed wood in an oven at 103 ℃ for 6 hours; the porosity of the wood is reduced by 15 percent, and the high-density layer of the wood is distributed on the surface layer (the density of the high-density layer is 0.93 g/cm)3The density of the low-density layer is 0.52g/cm3) The water content of the wood was 5 wt%.
(2) The mass ratio of 1, 4-butanediol diglycidyl ether to trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (viscosity of 12.2 mPas), adding 100% by mass of methyldischianhydride based on the low-viscosity epoxy component as a curing agent and 0.5% by mass of 2,4, 6-tris (dimethylaminomethyl) phenol based on the low-viscosity epoxy component as an accelerator, and uniformly mixing to obtain a reinforcing agent; immersing the wood obtained in the step (1) into a reinforcing agent liquid, vacuum-immersing for 60min under-1 MPa, and then pressurizing and immersing for 24h under 1.2 MPa; after the impregnation is completed, the surface of the sample is wiped dry and left for one day at room temperature.
(3) Putting the wood impregnated with the reinforcing agent into an oven for curing treatment, heating at 80 ℃ for 6h, and curing at 120 ℃ for 12 h; the cured wood was dried at 103 ℃ to constant weight with a moisture content of 9 wt%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
Example 6
(1) Soaking poplar with the thickness of 4cm in water for 2 hours for softening; will soften the placeThe processed wood block is placed on a press plate of a press, the temperature of the upper press plate and the lower press plate of the press is 150 ℃, the preheating time is 30s, the thickness is calibrated by a thickness gauge to be 2cm, and the compression ratio is determined to be 50%. Closing the press, turning off the pressing plate heating device, and compressing for 6 h; heating the compressed wood in an oven at 103 ℃ for 6 hours; the porosity of the wood is reduced by 30 percent, and simultaneously, the high-density layer of the wood is distributed on the surface layer (the density of the high-density layer is 0.93 g/cm)3The density of the low-density layer is 0.52g/cm3). The moisture content of the wood was 5 wt%.
(2) The mass ratio of the 1, 4-butanediol diglycidyl ether to the trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (the viscosity is 12.2 mPas), adding 100% of methyl dick anhydride based on the mass of the low-viscosity epoxy component as a curing agent and 0.5% of 2,4, 6-tris (dimethylaminomethyl) phenol based on the mass of the low-viscosity epoxy component as an accelerator, finally adding 100% of acetone based on the mass of the low-viscosity epoxy component and the curing agent as a solvent for dilution treatment, and uniformly mixing to obtain a reinforcing agent; immersing the wood obtained in the step (1) into a reinforcing agent liquid, carrying out vacuum impregnation for 60min under-1 MPa, and then carrying out pressure impregnation for 24h under 1.2 MPa; after the impregnation is completed, the reinforcing liquid on the surface of the sample is wiped dry and is aged at room temperature for one day.
(3) Putting the wood impregnated with the reinforcing agent into an oven for curing treatment, heating at 80 ℃ for 6h, and curing at 120 ℃ for 12 h; the cured wood was dried at 103 ℃ to constant weight with a moisture content of 9 wt%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
Example 7
(1) Soaking poplar with the thickness of 4cm in water for 2 hours for softening treatment; and (3) placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 160 ℃, the preheating time is 25s, and the thickness is calibrated to be 2cm by using a thickness gauge to determine the compression ratio to be 50%. Closing the press, turning off the pressing plate heating device, and compressing for 10 h; heating the compressed wood in an oven at 103 ℃ for 6 hours; the porosity of the wood is reduced by 30 percent, and the high-density layer of the wood is distributed on the surface layer (high-density layer)The density was 0.92g/cm3The density of the low-density layer is 0.52g/cm3). The moisture content of the wood was 3 wt%.
(2) The mass ratio of the vinyl acetate to the methacrylamide is 1: 1 as an ethylene monomer, adding benzoyl peroxide which is 2 percent of the mass of the ethylene monomer and is used as an initiator, and uniformly mixing to obtain a reinforcing agent; immersing the wood obtained in the step (1) into a reinforcing agent liquid, carrying out vacuum impregnation for 60min under-1 Mpa, and then carrying out pressure impregnation for 24h under 1.2 Mpa. After the impregnation was completed, the reinforcing liquid on the surface of the sample was wiped dry, covered with tin foil, and left to stand at room temperature for one day.
(3) Putting the wood impregnated with the reinforcing agent into an oven for curing treatment, heating at 80 ℃ for 6h, and curing at 120 ℃ for 12 h; the cured wood was dried to constant weight at 103 ℃ with a moisture content of 6 wt%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
Example 8
(1) Soaking poplar with the thickness of 4cm in water for 2 hours for softening treatment; and (3) placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 180 ℃, the preheating time is 20s, and the thickness is calibrated to be 2cm by using a thickness gauge to determine the compression ratio to be 50%. Closing the press, turning off the pressing plate heating device, and compressing for 8 h; heating the compressed wood in an oven at 103 ℃ for 15 hours; the porosity of the wood is reduced by 30 percent, and the high-density layer of the wood is distributed on the surface layer (the density of the high-density layer is 0.92 g/cm)3The density of the low-density layer is 0.50g/cm3). The moisture content of the wood was 3 wt%.
(2) The mass ratio of the glycerol triglycidyl ether to the bisphenol A epoxy resin is 1: 1 as a low-viscosity epoxy component (viscosity of 14.7mPa · s) and 50% by mass, based on the mass of the low-viscosity epoxy component, of phthalic anhydride as a curing agent and 1% by mass, based on the mass of the low-viscosity epoxy component, of methylimidazole as an accelerator; immersing the wood obtained in the step (1) into a reinforcing agent liquid, vacuum-immersing for 45min under-0.2 MPa, and then pressurizing and immersing for 12h under 1.5 MPa; after the impregnation is completed, the reinforcing liquid on the surface of the sample is wiped dry and is aged at room temperature for one day.
(3) Putting the wood impregnated with the reinforcing agent into an oven for curing treatment, heating at 70 ℃ for 8h, and curing at 110 ℃ for 15 h; the cured wood was dried to constant weight at 103 ℃ with a water content of 10 wt%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
Example 9
(1) Soaking poplar with the thickness of 4cm in water for 2 hours for softening; placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 150 ℃, the preheating time is 30s, the thickness is calibrated to be 2cm by using a thickness gauge, the compression ratio is determined to be 50%, the press is closed, a press plate heating device is turned off, and the compression time is 6 h; heating the compressed wood in an oven at 103 ℃ for 6 hours; the porosity of the wood is reduced by 30 percent, and the high-density layer of the wood is distributed on the surface layer (the density of the high-density layer is 0.93 g/cm)3The density of the low-density layer is 0.52g/cm3). The moisture content of the wood is 5 percent.
(2) The mass ratio of the 1, 4-butanediol diglycidyl ether to the trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (viscosity of 12.2 mPas), adding 100% by mass of methyldischianhydride based on the low-viscosity epoxy component as a curing agent and 0.5% by mass of 2,4, 6-tris (dimethylaminomethyl) phenol based on the low-viscosity epoxy component as an accelerator, and uniformly mixing to obtain a reinforcing agent; immersing the wood obtained in the step (1) into a reinforcing agent liquid, vacuum-immersing for 60min under-1 MPa, and then pressurizing and immersing for 24h under 1.2 MPa; after the impregnation is completed, the surface of the sample is wiped dry and left for one day at room temperature.
(3) Putting the wood impregnated with the reinforcing agent into an oven for curing treatment, and curing for 12 hours at 120 ℃; the cured wood was dried to constant weight at 103 ℃ with a moisture content of 9%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
Example 10
(1) Having a thickness of 4cmSoaking poplar in water for 2h for softening; placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 150 ℃, the preheating time is 30s, the thickness is calibrated to be 2cm by using a thickness gauge, the compression ratio is determined to be 50%, the press is closed, a press plate heating device is turned off, and the compression time is 6 h; heating the compressed wood in an oven at 103 ℃ for 6 hours; the porosity of the wood is reduced by 30 percent, and the high-density layer of the wood is distributed on the surface layer (the density of the high-density layer is 0.93 g/cm)3The density of the low-density layer is 0.52g/cm3). The moisture content of the wood is 3 percent.
(2) The mass ratio of the 1, 4-butanediol diglycidyl ether to the trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (viscosity of 12.2 mPas), adding 100% by mass of methyldischianhydride based on the low-viscosity epoxy component as a curing agent and 0.5% by mass of 2,4, 6-tris (dimethylaminomethyl) phenol based on the low-viscosity epoxy component as an accelerator, and uniformly mixing to obtain a reinforcing agent; immersing the wood obtained in the step (1) into a reinforcing agent liquid, carrying out vacuum impregnation for 60min under-1 MPa, and then carrying out pressure impregnation for 24h under 1.2 MPa; after the impregnation is finished, the reinforcing liquid on the surface of the sample is wiped dry.
(3) Putting the wood impregnated with the reinforcing agent into an oven for curing treatment, heating at 80 ℃ for 6h, and curing at 120 ℃ for 12 h; the cured wood was dried to constant weight at 103 ℃ with a moisture content of 8 wt%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
Comparative example 1
The results of the direct tests on the bending strength, compression strength, bending modulus, impact toughness and hardness of the untreated poplar are shown in Table 1.
Comparative example 2
(1) Soaking poplar with the thickness of 4cm in water for 2 hours for softening; placing the softened wood block on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 150 ℃, the preheating time is 30s, the thickness is calibrated to be 2cm by using a thickness gauge, the compression ratio is determined to be 50%, the press is closed, a press plate heating device is turned off, and the compression time is 6 h; heating the compressed wood in an oven at 103 ℃ for 6 hours; the porosity of the wood is reduced by 30%, meanwhile, the high-density layer of the wood is distributed on the surface layer, and the water content of the wood is 12% by weight.
The bending strength, compression strength, bending modulus, impact toughness, hardness results of the treated wood are given in Table 1.
Comparative example 3
(1) The mass ratio of the 1, 4-butanediol diglycidyl ether to the trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (the viscosity is 12.2 mPas), adding 100% of methyl dick anhydride based on the mass of the low-viscosity epoxy component as a curing agent and 0.5% of 2,4, 6-tri (dimethylaminomethyl) phenol based on the mass of the low-viscosity epoxy component as an accelerator, finally adding 100% of acetone based on the mass of the low-viscosity epoxy component and the curing agent as a solvent for dilution treatment, and uniformly mixing to obtain a reinforcing agent; immersing untreated poplar in reinforcing agent liquid, vacuum immersing at-1 Mpa for 60min, and pressure immersing at 1.2Mpa for 24 h. After the impregnation is finished, the modifying solution on the surface of the sample is wiped dry and is aged for one day at room temperature.
(2) Heating at 80 deg.C for 6h, and curing at 120 deg.C for 12 h; the cured wood was dried at 103 ℃ to constant weight with a water content of 11 wt%.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
Comparative example 4
(1) The mass ratio of the 1, 4-butanediol diglycidyl ether to the trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (the viscosity is 12.2 mPas), adding 100% of methyl dick anhydride based on the mass of the low-viscosity epoxy component as a curing agent and 0.5% of 2,4, 6-tri (dimethylaminomethyl) phenol based on the mass of the low-viscosity epoxy component as an accelerator, finally adding 100% of acetone based on the mass of the low-viscosity epoxy component and the curing agent as a solvent for dilution treatment, and uniformly mixing to obtain a reinforcing agent; immersing untreated poplar in reinforcing agent liquid, vacuum immersing at-1 Mpa for 60min, and pressure immersing at 1.2Mpa for 24 h. After the impregnation is finished, the modifying solution on the surface of the sample is wiped dry and is aged for one day at room temperature.
(2) And (3) placing the wood block subjected to the dipping treatment on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 150 ℃, and the thickness is calibrated to be 2cm by using a thickness gauge to determine the compression ratio to be 50%. The press was closed and the platen heating was turned off for a compression time of 6 h.
The treated wood was tested for flexural strength, compressive strength, flexural modulus, impact toughness, hardness, and rate of weight gain, and the results are shown in Table 1.
Comparative example 5
(1) The mass ratio of the 1, 4-butanediol diglycidyl ether to the trimethylolpropane triglycidyl ether is 1: 1 as a low-viscosity epoxy component (the viscosity is 12.2 mPas), adding 100% of methyl dick anhydride based on the mass of the low-viscosity epoxy component as a curing agent and 0.5% of 2,4, 6-tri (dimethylaminomethyl) phenol based on the mass of the low-viscosity epoxy component as an accelerator, finally adding 100% of acetone based on the mass of the low-viscosity epoxy component and the curing agent as a solvent for dilution treatment, and uniformly mixing to obtain a reinforcing agent; immersing untreated poplar in reinforcing agent liquid, vacuum immersing at-1 Mpa for 60min, and pressure immersing at 1.2Mpa for 24 h. After the impregnation is finished, the modifying solution on the surface of the sample is wiped dry and is aged for one day at room temperature.
(2) And (3) placing the wood block subjected to the dipping treatment on a press plate of a press, wherein the temperature of the upper press plate and the lower press plate of the press is 150 ℃, and the thickness is calibrated to be 3cm by using a thickness gauge to determine the compression ratio to be 25%. The press was closed and the platen heating was turned off for a compression time of 6 h.
The bending strength, compression strength, bending modulus, impact toughness, hardness, and weight gain of the treated wood were measured, and the results are shown in table 1.
TABLE 1
Figure BDA0003558744550000181
As can be seen from the results in table 1, compared with the method of performing resin impregnation treatment and then performing compression treatment on wood, the preparation method of the present invention can control the compression layer by compressing wood and then impregnating the reinforcing agent, thereby realizing the regulation and control of the reinforcing agent polymer in macroscopic distribution and realizing the promotion of mechanical loads of different types. The ultrahigh-strength wood prepared by the preparation method can effectively improve specific mechanical properties and synchronously improve various mechanical properties of the wood.
Example 6 compared with comparative example 4, when the preparation method of the invention is adopted, the solvent is added in the reinforcing agent, the weight gain rate of example 6 is far lower than that of comparative example 4, and the mechanical property of the wood is equivalent to that of comparative example 4.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims (10)

1. A preparation method of ultrahigh-strength wood is characterized by comprising the following steps:
(1) carrying out hot pressing treatment on the softened wood, controlling the compression ratio of the wood to be 10% -50%, and then carrying out first drying;
(2) and (2) impregnating the wood obtained in the step (1) with the reinforcing agent, curing, and then carrying out secondary drying to obtain the ultrahigh-strength wood.
2. The preparation method according to claim 1, wherein after the hot pressing treatment, the porosity of the wood is reduced by 30-5%; and/or
The wood after the hot pressing treatment comprises a high-density layer and a low-density layer, and the density of the high-density layer is preferably 0.7-1.2g/cm3The density of the low-density layer is in the range of 0.3-0.7g/cm3。
3. The production method according to claim 1 or 2, wherein,
the softening treatment conditions include: soaking the wood in water for 2-24 h; and/or
The hot-pressing treatment conditions comprise: the hot pressing temperature is 120-; and/or
The moisture content of the wood after the first drying is 5 wt% or less.
4. The production method according to any one of claims 1 to 3,
the reinforcing agent impregnation process comprises the following steps: carrying out vacuum impregnation and then carrying out pressurized impregnation; preferably, the vacuum impregnation conditions include: the pressure is-0.05 MPa to-0.1 MPa, and the dipping time is 0.5 to 2 hours; and/or
The pressure impregnation conditions include: the pressure is 0.5-1.5MPa, and the dipping time is 4-24 h.
5. The production method according to any one of claims 1 to 4,
the curing conditions include: heating at 60-140 deg.C for 6-24 h;
preferably heating at 60-80 deg.C for 6-12 h, and heating at 120-140 deg.C for 8-12 h; and/or
The moisture content of the wood after the second drying is below 12 weight percent; and/or
The first drying and the second drying conditions independently comprise: the drying temperature is 60-105 ℃, and the drying time is 6-24 h.
6. The production method according to any one of claims 1 to 5,
the reinforcing agent is selected from epoxy reinforcing agents and/or ethylene reinforcing agents;
preferably, the epoxy-based reinforcing agent includes a low viscosity epoxy component and a curing agent;
preferably, the curing agent is used in an amount of 10% to 100% by weight of the low viscosity epoxy component;
preferably, the low viscosity epoxy component has a viscosity of 1 to 50 mPa-s; more preferably, the low viscosity epoxy component is selected from at least one of 1, 4-butanediol diglycidyl ether, glycerol triglycidyl ether, trimethylolpropane triglycidyl ether, glycidyl acrylate, glycidyl methacrylate, polyethylene glycol diglycidyl ether, and bisphenol a epoxy resin;
the curing agent is selected from at least one of phthalic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride, glutaric anhydride, nadic anhydride, methyl nadic anhydride, eleostearic anhydride, m-phenylenediamine, diaminodiphenylmethane, isophorone diamine and diaminodiphenyl sulfone.
7. The production method according to claim 6, wherein the epoxy-based reinforcing agent further comprises one or both of an accelerator and a first organic solvent;
the amount of the accelerant is 1 to 5 percent of the weight of the low-viscosity epoxy component;
the dosage of the first organic solvent is 0-30% of the total mass of the low-viscosity epoxy component and the curing agent;
the accelerant is selected from at least one of 2,4, 6-tri (dimethylaminomethyl) phenol, 2-methylimidazole, methylimidazole and triethanolamine;
the first organic solvent is at least one selected from the group consisting of absolute ethanol, acetone and tetrahydrofuran.
8. The production method according to any one of claims 1 to 6,
the ethylene reinforcing agent comprises an ethylene monomer and an initiator;
preferably, the amount of the initiator is 0.5 to 2 percent of the mass of the ethylene monomer;
the ethylene monomer is selected from at least one of methyl methacrylate, methyl acrylate, styrene, glycidyl methacrylate, allyl glycidyl ether, hydroxypropyl methacrylate, dimethylaminoethyl methacrylate, ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, propylene glycol dimethacrylate, polypropylene glycol dimethacrylate, acrylonitrile, vinyl acetate, methacrylamide, isobutyl vinyl ether, allyl chloride and p-chlorostyrene monomer;
the initiator is selected from azodiisobutyronitrile and/or benzoyl peroxide.
9. The production method according to claim 8, wherein the ethylene-based reinforcing agent comprises an ethylene-based monomer, an initiator, and a second solvent; the dosage of the second organic solvent is 0-30% of the mass of the ethylene monomer; the second organic solvent is at least one selected from the group consisting of absolute ethanol, acetone and tetrahydrofuran.
10. An ultra-high strength wood produced by the method of any one of claims 1 to 9.
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