CN114179182A - Resin-reinforced wood-based composite material and preparation method thereof - Google Patents
Resin-reinforced wood-based composite material and preparation method thereof Download PDFInfo
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- CN114179182A CN114179182A CN202111346513.4A CN202111346513A CN114179182A CN 114179182 A CN114179182 A CN 114179182A CN 202111346513 A CN202111346513 A CN 202111346513A CN 114179182 A CN114179182 A CN 114179182A
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- 239000002023 wood Substances 0.000 title claims abstract description 164
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
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- 239000000178 monomer Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
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- 238000007654 immersion Methods 0.000 claims abstract description 3
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- 239000000243 solution Substances 0.000 claims description 19
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- 238000005470 impregnation Methods 0.000 claims description 14
- 239000011259 mixed solution Substances 0.000 claims description 13
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- 238000002791 soaking Methods 0.000 claims description 9
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical group N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 8
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 8
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 claims description 4
- 229960002218 sodium chlorite Drugs 0.000 claims description 4
- 235000010265 sodium sulphite Nutrition 0.000 claims description 4
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- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 3
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 3
- 208000005156 Dehydration Diseases 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- XTLNYNMNUCLWEZ-UHFFFAOYSA-N ethanol;propan-2-one Chemical compound CCO.CC(C)=O XTLNYNMNUCLWEZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002538 fungal effect Effects 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 3
- 231100000331 toxic Toxicity 0.000 abstract description 2
- 230000002588 toxic effect Effects 0.000 abstract description 2
- 230000004048 modification Effects 0.000 description 14
- 238000012986 modification Methods 0.000 description 14
- 210000002421 cell wall Anatomy 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
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- 239000000463 material Substances 0.000 description 5
- 238000007385 chemical modification Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- 241000219000 Populus Species 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 229920002522 Wood fibre Polymers 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
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- 238000007906 compression Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002025 wood fiber Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 230000021736 acetylation Effects 0.000 description 1
- 238000006640 acetylation reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
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- 238000001000 micrograph Methods 0.000 description 1
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- 231100000956 nontoxicity Toxicity 0.000 description 1
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- 229920001568 phenolic resin Polymers 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
Classifications
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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
- B27K3/34—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
- 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
- B27K3/0207—Pretreatment of wood before 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
- B27K3/02—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
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/001—Heating
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
A resin reinforced wood-based composite material and a preparation method thereof, natural wood is immersed in a delignification solution and reacted to obtain wood with partial lignin removed; and (3) immersing the wood from which part of lignin is removed into a monomer solution added with an initiator, and carrying out immersion treatment and oven heating to obtain the resin-reinforced delignified wood. The resin reinforced delignified wood provided by the invention has high density, high hardness, excellent bending resistance and excellent impact toughness. Volatile toxic and harmful substances are not generated in the using process of the wood product, and in addition, the wood product has the effect of recycling delignified wood generated by fungal attack under natural conditions.
Description
Technical Field
The invention belongs to the technical field of wood modification, and particularly relates to a resin-reinforced delignified wood and a preparation method thereof.
Background
Wood is a renewable and naturally degradable biomass material, and is widely applied to the field of buildings due to the characteristics of light weight, high strength, high modulus, low thermal conductivity and the like. Unlike other building materials such as steel, cement, plastic and the like, wood has a unique biological structure, and forms a three-dimensional porous structure with cellulose as a skeleton and lignin and hemicellulose as filling and gluing substances. The increased use of wood-based materials is driven by a variety of factors, including reduced carbon emissions, increased energy and support for sustainable industrialization. In recent years, the demand for wood has been increasing due to the increased awareness of sustainable development and environmental protection in productive life. However, in contrast, the wood supply is decreasing. Meanwhile, people have increasingly high calls for forest resource protection. Therefore, the problems of fully utilizing forest resources, prolonging the service life of the wood and improving the comprehensive utilization rate of the wood are urgently solved. To alleviate this conflict, the use of fast growing wood has increased substantially. As an important supplementary resource of natural forests, the fast-growing commercial wood in China develops rapidly, and the mass use of the fast-growing wood becomes an important way for solving the contradiction between supply and demand of wood. However, fast-growing wood is often classified as a low grade material due to its low density, low strength, unstable size, susceptibility to fungal attack and photodegradation. The safety of wood products, especially structural wood, made from fast-growing wood is poor, which severely limits the application range of the fast-growing wood and reduces the added value of wood. Therefore, the method has great significance for modifying fast growing wood.
Currently, the commonly used wood modification methods are mainly divided into three categories: chemical modification, heat treatment and impregnation treatment. The main mechanisms of wood modification are swelling, compression of the wood structure or changes in the molecular structure of the wood. However, most wood modification processes involve the use of harmful chemicals, which will cause ecological problems during or at the end of the application of the wood product. Furthermore, the use of large amounts of non-renewable agents in wood modification will result in a decrease in sustainability of the wood material. Therefore, reducing the release of toxic substances into the environment is particularly important for wood modification. The chemical modification has the characteristic of lasting modification effect, and the modified wood often has excellent dimensional stability, corrosion resistance and mechanical property because the modifier and the wood components are subjected to chemical reaction to form covalent bonds. However, chemical modification is usually accompanied by the formation of reaction by-products, such as acetylation, in which acetic anhydride reacts with wood components to form acetic acid as a by-product, which causes some degradation of wood products during processing and use. The heat treatment modification is the most widely industrialized method in the wood modification at present, and the dimensional stability, durability and corrosion resistance of the wood are obviously improved by the heat treatment, but the density, hardness, bending resistance and impact toughness are reduced to a certain extent. Compared with chemical modification and heat treatment, the impregnation modification process is simple, has low cost and is widely researched. The impregnation modification is mainly to impregnate and fill the wood by utilizing reactive monomers or low-molecular synthetic resin, and the in-situ polymerization is carried out in a wood cell cavity or a wood cell wall, so that the bulk density of the wood is improved, and the performance of the wood is improved. Common impregnation modifying monomers include methyl methacrylate, styrene, polyethylene glycol, furfuryl alcohol, urea formaldehyde resin, phenol formaldehyde resin, melamine formaldehyde resin and the like. Among them, the water-soluble monomer has good compatibility with wood, but wood modified by the monomer has serious problem of loss in the using process. In contrast, water-insoluble unsaturated vinyl monomers are less polar and less compatible with wood, do not swell wood parenchyma, and are present in wood only in a physically filled form. But the wood modified by the monomer has good leaching resistance and high mechanical strength, and does not release toxic and harmful substances.
The safety of wood products, especially structural wood, made from fast-growing wood is poor, which severely limits the application range of the fast-growing wood and reduces the added value of wood. Therefore, the method has important significance for modifying the fast-growing wood. In addition, in order to improve the permeability of the vinyl monomer in the wood, the modification effect of the monomer on the wood is further enhanced. The present invention performs delignification pretreatment on wood to increase the porosity of the wood, thereby increasing the permeability of the monomer in the wood.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the problems of poor quality of fast-growing wood and poor swelling property and permeability of unsaturated vinyl monomers in wood, the invention provides the enhanced delignification wood and the preparation method thereof, and the enhanced delignification wood has the characteristics of simple process, no toxicity, environmental protection and excellent mechanical property.
The technical scheme is as follows: a preparation method of a resin reinforced wood-based composite material comprises the following steps: immersing natural wood into a lignin removing solution, and reacting to obtain wood with partial lignin removed; and (3) immersing the wood from which part of lignin is removed into a monomer solution added with an initiator, and carrying out immersion treatment and oven heating to obtain the resin-reinforced delignified wood.
The delignification solution is at least one selected from a sodium chlorite/acetic acid mixed solution and a sodium hydroxide/sodium sulfite mixed solution.
When the natural wood is reacted in the delignification solution, the reaction time is 2-6 h, and the reaction temperature is 80-100 ℃.
The above partially delignified wood is subjected to a solvent dehydration treatment before being immersed in the monomer solution: soaking part of the delignified wood with ethanol, soaking the delignified wood with an ethanol-acetone mixed solution with a volume ratio of 1:1, and finally soaking the delignified wood with pure acetone.
The initiator is azobisisobutyronitrile or benzoyl peroxide.
The monomer solution is methyl methacrylate, styrene or vinyl acetate solution.
The impregnation treatment is to immerse the delignified wood into a vacuum impregnation tank filled with a monomer solution, carry out vacuum impregnation for 2 hours under the vacuum degree condition of-0.1-0.08 MPa, and then recover the normal pressure to ensure that the delignified wood is continuously impregnated for 6 hours under the normal pressure to obtain the delignified wood after the impregnation treatment.
The oven heating temperature is that the impregnated delignified wood is heated for 4 hours at 75 ℃, and then the temperature is raised to 105 ℃ until the weight of the wood is not changed in the last two times of weighing.
The resin reinforced wood-based composite material prepared by the preparation method.
Has the advantages that: 1. the invention adopts a method of combining physics and chemistry to carry out strengthening modification treatment on wood, firstly carries out delignification treatment on the wood to improve the porosity of the wood, and then uses unsaturated ethylene monomers to dip and fill the wood. Delignification treatment facilitates the penetration of the monomer into the wood. 2. The resin reinforced modified delignified wood prepared by the method greatly improves the density of the wood, and the modified wood has excellent bending resistance, compression resistance and high hardness. 3. The method can be widely applied to the enhancement and modification of the fast-growing wood with low density and low material grade, and has positive significance for expanding the application range of the fast-growing wood and improving the added value of the fast-growing wood. 4. The impregnation process provided by the invention is simple, the equipment is low in cost, and large-scale production can be carried out. 5. The invention can be used for modifying and recycling part of delignified wood generated by fungal attack under natural conditions, and has important significance for sustainable utilization of the wood.
Drawings
FIG. 1 is a scanning electron micrograph of a natural wood according to example 1; wherein a is a cross section of the natural lumber, and b is an enlarged cross section of the natural lumber.
FIG. 2 is a scanning electron micrograph of a partially lignin-removed wood according to example 1; wherein a is a cross section of delignified wood and b is an enlarged view of the cross section of delignified wood.
FIG. 3 is a scanning electron micrograph of a resin-reinforced delignified wood as prepared in example 1; wherein a is the cross section of the resin reinforced delignified wood and b is the enlarged cross section of the resin reinforced delignified wood.
Detailed Description
The resin-reinforced wood-based composite material and the method for producing the same according to the present invention will be described in further detail with reference to specific examples. Herein, the normal pressure means a normal atmospheric pressure.
Example 1
Natural wood (poplar, sample size: 100 mm. times.30 mm. times.5 mm) was immersed in a 2 wt.% mixed solution of sodium chlorite and acetic acid buffer (pH4.5), and heated at 80 ℃ for 4 hours to remove part of lignin. Then washing with boiled deionized water to obtain the wood with partial lignin removed.
And then, sequentially putting the wood with part of lignin removed into ethanol, ethanol/acetone mixed solution with the volume ratio of 1:1 and pure acetone for soaking for 2 hours respectively to exchange water in the wood.
After being soaked in acetone, the wood with part of lignin removed is transferred into methyl methacrylate solution containing 0.3 wt.% of azobisisobutyronitrile, and is soaked for 2 hours under the vacuum degree of-0.1 MPa and then is soaked for 6 hours under normal pressure.
Wrapping the impregnated wood with aluminum foil, heating in an oven at 75 deg.C for 4h, and heating at 105 deg.C until the quality of the last two times is unchanged to obtain the resin-reinforced delignified wood of example 1.
FIG. 1 is a scanning electron microscope image of the natural wood in example 1, and it can be observed that the natural wood fiber cells are mainly composed of cell cavities and cell walls, and the inside of the cell cavities is mainly air and has no substantial substance. The cell walls are filled with the substance, and provide a foundation for the density and mechanical properties of the wood. In addition, the area between the cell walls of the individual wood fibers is the intercellular layer and the corners of the cell walls, where a high content of lignin is distributed. It can be observed from FIG. 2 that, by delignification treatment, the intercellular layer between the cell walls and the corners of the cell walls are clearly separated. After the magnification of the electron microscope (FIG. 2: b), the coarse structure of the cell wall cross section was observed, and nanopores appeared on the secondary wall. It can be observed from fig. 3 that the wood cell cavities were almost completely filled with resin and the interstitial layers and cell wall corners were also refilled due to delignification by the methyl methacrylate impregnation treatment. Compared to delignified wood, the cell walls of the methyl methacrylate impregnated wood become smooth and the nanopores on the secondary walls are also covered.
Example 2
Firstly, natural wood (poplar, sample size: 100mm multiplied by 30mm multiplied by 5mm) is immersed into a mixed solution of sodium hydroxide and sodium sulfite with the concentration of 2.5mol/L and 0.5mol/L, and is heated for 2 hours under the condition of 100 ℃, and partial lignin is removed. Then washing with boiled deionized water to obtain the wood with partial lignin removed.
And then, sequentially putting the wood with part of lignin removed into ethanol, ethanol/acetone mixed solution with the volume ratio of 1:1 and pure acetone for soaking for 2 hours respectively to exchange water in the wood.
After being soaked in acetone, the wood with part of lignin removed is transferred to a styrene solution containing 0.5 wt.% of benzoyl peroxide, and is soaked for 2 hours under the vacuum degree of-0.1 MPa and then is soaked for 6 hours under normal pressure.
Wrapping the impregnated wood with aluminum foil, heating in an oven, and heating at 105 deg.C until the quality of the last two times is unchanged to obtain the resin-reinforced delignified wood of example 2.
Example 3
Firstly, natural wood (poplar, sample size: 100mm multiplied by 30mm multiplied by 5mm) is immersed into a mixed solution of sodium hydroxide with the concentration of 2.5mol/L and sodium sulfite with the concentration of 0.5mol/L, and is heated for 1h under the condition of 100 ℃, and partial lignin is removed. Then, the wood from which part of the lignin was removed was immersed in a 2 wt% mixed solution of sodium chlorite and acetic acid (pH4.5), heated at 80 ℃ for 4 hours, and further delignified. Then washing with boiled deionized water to obtain the wood with partial lignin removed.
And then, sequentially putting the wood with part of lignin removed into ethanol, ethanol/acetone mixed solution with the volume ratio of 1:1 and pure acetone for soaking for 2 hours respectively to exchange water in the wood.
After being soaked in acetone, the wood with part of lignin removed is transferred into a vinyl acetate solution containing 1 wt.% of azobisisobutyronitrile, and is soaked for 2 hours under the vacuum degree of-0.1 MPa and then is soaked for 6 hours under normal pressure.
Wrapping the impregnated wood with aluminum foil, heating in an oven, and heating at 105 deg.C until the quality of the last two times is unchanged to obtain the resin-reinforced delignified wood of example 3.
Performance testing
The resin-reinforced delignified woods prepared in example 1, example 2 and example 3 were subjected to density, hardness, bending resistance and impact performance tests, and the results are shown in table 1.
TABLE 1 Performance test results for resin-reinforced delignified woods prepared in example 1, example 2 and example 3
Note: according to the determination of the bending property of GB/T9341-. Sample size: 100mm × 25mm × 5mm, span 40mm, test speed 2 mm/min.
As can be seen from table 1, the resin-reinforced delignified wood prepared in examples 1 to 3 of the present invention had a significantly increased density and a hardness 2 times that of natural wood, as compared to natural wood. The bending strength is increased by 51-76%, the bending modulus is increased by 58-78%, and the impact toughness is increased by 39-60%. The resin reinforced wood-based composite material and the preparation method thereof provided by the invention can obviously improve the mechanical property of wood, and have the effects of enhancing modification and recycling delignified wood generated by fungal attack under natural conditions.
Claims (9)
1. A preparation method of a resin reinforced wood-based composite material is characterized by comprising the following steps: immersing natural wood into a lignin removing solution, and reacting to obtain wood with partial lignin removed; and (3) immersing the wood from which part of lignin is removed into a monomer solution added with an initiator, and carrying out immersion treatment and oven heating to obtain the resin-reinforced delignified wood.
2. The method of preparing a resin-reinforced wood-based composite material according to claim 1, wherein the delignification solution is at least one selected from a sodium chlorite/acetic acid mixed solution and a sodium hydroxide/sodium sulfite mixed solution.
3. The method for preparing the resin-reinforced wood-based composite material according to claim 1, wherein the reaction time of the natural wood in the delignification solution is 2 to 6 hours, and the reaction temperature is 80 to 100 ℃.
4. The method of preparing a resin-reinforced wood-based composite material according to claim 1, wherein the partially delignified wood is subjected to a solvent dehydration treatment before being immersed in the monomer solution: soaking part of the delignified wood with ethanol, soaking the delignified wood with an ethanol-acetone mixed solution with a volume ratio of 1:1, and finally soaking the delignified wood with pure acetone.
5. The method of preparing a resin-reinforced wood-based composite material according to claim 1, wherein the initiator is azobisisobutyronitrile or benzoyl peroxide.
6. The method of producing a resin-reinforced wood-based composite material according to claim 1, wherein the monomer solution is a methyl methacrylate, styrene, or vinyl acetate solution.
7. The method for preparing the resin-reinforced wood-based composite material according to claim 1, wherein the impregnation treatment comprises the steps of immersing the delignified wood in a vacuum impregnation tank filled with a monomer solution, carrying out vacuum impregnation for 2 hours under the vacuum degree condition of-0.1-0.08 MPa, then recovering the normal pressure, and continuously impregnating the delignified wood for 6 hours under the normal pressure to obtain the delignified wood after the impregnation treatment.
8. The method of claim 1, wherein the oven heating temperature is to heat the impregnated delignified wood at 75 ℃ for 4 hours, and then to 105 ℃ until the weight of the wood is unchanged in the last two times of weighing.
9. A resin-reinforced wood-based composite material obtained by the production method according to any one of claims 1 to 8.
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