CN113510819A - Aldehyde-free all-plant fiber density board based on nanocellulose and preparation method thereof - Google Patents
Aldehyde-free all-plant fiber density board based on nanocellulose and preparation method thereof Download PDFInfo
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- CN113510819A CN113510819A CN202110449105.5A CN202110449105A CN113510819A CN 113510819 A CN113510819 A CN 113510819A CN 202110449105 A CN202110449105 A CN 202110449105A CN 113510819 A CN113510819 A CN 113510819A
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- 229920001046 Nanocellulose Polymers 0.000 title claims abstract description 67
- 239000000835 fiber Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000002023 wood Substances 0.000 claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- ZNZYKNKBJPZETN-WELNAUFTSA-N Dialdehyde 11678 Chemical compound N1C2=CC=CC=C2C2=C1[C@H](C[C@H](/C(=C/O)C(=O)OC)[C@@H](C=C)C=O)NCC2 ZNZYKNKBJPZETN-WELNAUFTSA-N 0.000 claims abstract description 42
- 238000009835 boiling Methods 0.000 claims abstract description 35
- 235000013312 flour Nutrition 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 27
- 238000007731 hot pressing Methods 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000002699 waste material Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000007873 sieving Methods 0.000 claims abstract description 5
- 241000196324 Embryophyta Species 0.000 claims description 31
- 230000003647 oxidation Effects 0.000 claims description 13
- 238000007254 oxidation reaction Methods 0.000 claims description 13
- 238000012216 screening Methods 0.000 claims description 11
- 241000609240 Ambelania acida Species 0.000 claims description 3
- 239000010905 bagasse Substances 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 2
- 244000082204 Phyllostachys viridis Species 0.000 claims description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 2
- 238000007605 air drying Methods 0.000 claims description 2
- 239000011425 bamboo Substances 0.000 claims description 2
- 244000166124 Eucalyptus globulus Species 0.000 claims 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 21
- 229920002678 cellulose Polymers 0.000 abstract description 17
- 239000001913 cellulose Substances 0.000 abstract description 17
- 238000005882 aldol condensation reaction Methods 0.000 abstract description 8
- 239000000853 adhesive Substances 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 4
- 229920005615 natural polymer Polymers 0.000 abstract description 4
- 239000002028 Biomass Substances 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 241000219927 Eucalyptus Species 0.000 description 15
- 238000000227 grinding Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 4
- 229920001807 Urea-formaldehyde Polymers 0.000 description 3
- 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 3
- 230000008859 change Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 240000007829 Haematoxylum campechianum Species 0.000 description 2
- 244000275012 Sesbania cannabina Species 0.000 description 2
- 125000003172 aldehyde group Chemical group 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic 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
- 229920002522 Wood fibre Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011094 fiberboard Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
- C08L1/04—Oxycellulose; Hydrocellulose, e.g. microcrystalline cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/05—Polymer mixtures characterised by other features containing polymer components which can react with one another
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a nanocellulose-based formaldehyde-free all-plant fiber density board and a preparation method thereof. The method comprises the following steps: crushing and sieving the waste fibers to obtain wood powder; adding wood powder into water, performing water boiling treatment, and drying to obtain the wood powder subjected to water boiling treatment; uniformly mixing the wood flour subjected to the water boiling treatment with dialdehyde nano cellulose to obtain a mixture; and transferring the mixture into a mold, naturally drying in the air, and then carrying out hot pressing treatment to obtain the aldehyde-free all-plant fiber density board based on the nano-cellulose. According to the method, dialdehyde nano-cellulose with high crystallinity, high specific surface area and biocompatibility is combined with cellulose hydroxyl on wood powder through aldol condensation reaction, and the dialdehyde nano-cellulose is used as a density board adhesive, so that the harm of formaldehyde generated by an organic adhesive to the environment is avoided. The raw materials adopted by the method are rich and sustainable, and the wood flour and the dialdehyde nano cellulose are renewable and degradable natural polymers, so that the full biomass density board can be endowed with good biodegradability.
Description
Technical Field
The invention belongs to the technical field of fiber boards, and particularly relates to a nanocellulose-based formaldehyde-free all-plant fiber density board and a preparation method thereof.
Background
The log board type board has high manufacturing cost, and the mechanical properties of the radial direction and the chord direction (the radial direction is that the wood is called as the longitudinal direction along the trunk direction and the chord direction along the annual ring direction) have great difference, so that the construction process requirement is high. Log wood has excellent radial (L direction) mechanical properties, while chordwise (R direction) mechanical properties are poor. The density board is an artificial board which is made by using wood fibers (such as wood and tree branches) or other plant fibers (such as bagasse and straws) as raw materials through soaking, hot grinding, drying, applying synthetic resin and pressing under the conditions of heating and pressurizing, and can be used for home decoration instead of log wood. Currently, the binder usually added in the density board during the production and use process is organic binder, such as phenolic resin, urea-formaldehyde resin or mixture of both and other natural polymers. For example: CN 111331703A describes a preparation process of a mixed glue of urea-formaldehyde resin and sesbania. The mixed glue is a urea-formaldehyde resin adhesive and sesbania glue according to the mass ratio of 1:1, mixing the mixture. Although the formaldehyde volatilization amount in the prepared board can be reduced, the organic binders can slowly release formaldehyde and other harmful volatile matters, so that the safety and environmental protection of the density board are difficult to improve.
Therefore, there is an urgent need to find a new environmentally friendly wood density board that does not release formaldehyde and does not rely on petrochemical-based adhesives to alleviate ecological stress.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a nanocellulose aldehyde-free whole plant fiber density board and a preparation method thereof.
The invention provides a preparation method of a nanocellulose aldehyde-free whole plant fiber density board, and the whole plant fiber density board obtained by the method has good mechanical properties and is environment-friendly.
The purpose of the invention is realized by at least one of the following technical solutions.
The preparation method of the nanocellulose aldehyde-free full-plant fiber density board provided by the invention comprises the following steps:
(1) firstly, putting the waste fibers into a grinder for grinding, and sieving (classifying and sieving by a sieve) to obtain wood powder;
(2) adding the wood powder obtained in the step (1) into deionized water, performing water boiling treatment, and drying to obtain the wood powder subjected to water boiling treatment;
(3) uniformly mixing the wood flour subjected to the water boiling treatment in the step (2) with dialdehyde nano cellulose to obtain a mixture; and transferring the mixture into a mold, naturally drying the mixture in the air, and then carrying out hot pressing treatment to obtain the nano-cellulose aldehyde-free whole plant fiber density board.
Further, the waste fiber in the step (1) is more than one of eucalyptus wood chips, bamboo chips, bagasse, straw and the like.
Further, the sieving in the step (1) comprises the following steps: the crushed fiber is firstly screened by a sieve with the aperture of 80 meshes and then screened by a sieve with the aperture of 100 meshes.
Further, the temperature of the water boiling treatment in the step (2) is 95-105 ℃.
Further, the time of the water boiling treatment in the step (2) is 1-2 h.
Further, the oxidation degree of the dialdehyde nano cellulose in the step (3) is 20-60%.
Further, the oven-dry mass ratio of the wood flour subjected to the water boiling treatment in the step (3) to the dialdehyde nano cellulose is 1: (1-5).
Further, the natural air drying time in the step (3) is 0.5-3 h.
Further, the temperature of the hot pressing treatment in the step (3) is 90-100 ℃, the time of the hot pressing treatment is 5-20min, and the pressure of the hot pressing treatment is 15-20 MPa.
Preferably, the step (3) of uniformly mixing is performed by mechanically stirring uniformly.
The invention provides a nanocellulose aldehyde-free whole plant fiber density board (lignin/fiber thermoplastic composite material) prepared by the preparation method.
The preparation method provided by the invention is a method for preparing the full-plant fiber density board based on aldol condensation reaction of dialdehyde nano cellulose and wood powder. The nano-cellulose is a natural polymer with good biocompatibility, excellent mechanical strength, rich functional groups and modification means. According to the invention, dialdehyde nano cellulose and low-value wood powder are subjected to aldol condensation reaction, mixed according to a certain proportion, and subjected to hot pressing in a die after being uniformly mixed to form the density board. Compared with the existing density board, the density board disclosed by the invention is biodegradable, free of chemical adhesives and formaldehyde release, simple and convenient in preparation method, and more green and environment-friendly.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the preparation method provided by the invention, dialdehyde nano-cellulose with high crystallinity, high specific surface area and biocompatibility is combined with cellulose hydroxyl on wood powder through aldol condensation reaction, and the dialdehyde nano-cellulose is used as a density board adhesive, so that the harm of formaldehyde generated by an organic adhesive to the environment is avoided.
(2) In the preparation method provided by the invention, the dialdehyde nano-cellulose is mainly prepared from the paddle board, the raw materials are rich and sustainable, the addition amount can be adjusted according to requirements, and both the wood powder and the dialdehyde nano-cellulose are renewable and degradable natural polymers, so that the full biomass density board can be endowed with good biodegradability; the full plant fiber density board prepared by the invention reasonably utilizes biomass resources, can replace part of organic binders, thereby reducing the environmental pollution caused by formaldehyde release, and can be applied to a plurality of fields such as packaging, furniture, buildings and the like according to proportion regulation.
Drawings
Fig. 1 is a flow chart of the preparation of nanocellulose aldehyde-free whole plant fiber density boards according to various embodiments of the present invention.
FIG. 2 is a graph of R-direction tensile properties of raw eucalyptus wood pieces.
Fig. 3 is a graph of tensile properties of the nanocellulose aldehyde-free whole plant fiber density board of example 1.
Fig. 4 is a graph of the change in tensile properties at mass ratio of the nanocellulose aldehyde-free whole plant fiber density board of example 4.
Fig. 5 is a graph of the change in draw down performance of dialdehyde nanocellulose at different degrees of oxidation for the nanocellulose aldehyde-free whole plant fiber density board based on example 5.
Detailed Description
The following examples are presented to further illustrate the practice of the invention, but the practice and protection of the invention is not limited thereto. It is noted that the processes described below, if not specifically described in detail, are all realizable or understandable by those skilled in the art with reference to the prior art. The reagents or apparatus used are not indicated to the manufacturer, and are considered to be conventional products available by commercial purchase.
The flow chart of the preparation of the lignin/fiber thermoplastic composite material in the embodiment of the invention is shown in figure 1.
Example 1
A preparation method of a nanocellulose aldehyde-free whole plant fiber density board comprises the following steps:
(1) firstly, putting the waste eucalyptus wood chips into a grinder for grinding, screening out the waste eucalyptus wood chips by using a sieve with the aperture of 80 meshes, and screening out the wood powder by using a sieve with the aperture of 100 meshes to obtain the wood powder;
(2) adding the wood flour obtained in the step (1) into water, performing water boiling treatment at the temperature of 100 ℃ for 1h, and drying to obtain the wood flour subjected to water boiling treatment;
(3) mixing the wood flour subjected to the water boiling treatment in the step (2) with dialdehyde nano cellulose (the oxidation degree is 54.1%), and mechanically stirring uniformly, wherein the absolute dry mass ratio of the wood flour subjected to the water boiling treatment to the dialdehyde nano cellulose is 1:1, the oven-dry mass of the dialdehyde nano cellulose is 1g, and a mixture is obtained; and transferring the mixture into a mold, naturally drying for 3h, carrying out hot pressing treatment at the temperature of 95 ℃ and under the pressure of 20MPa for 10min, removing the mold, and carrying out hot pressing for 5min under the same temperature and pressure to obtain the aldehyde-free all-plant fiber density board based on the nano-cellulose.
FIG. 2 is a graph of the tensile properties of natural eucalyptus wood pieces in the R direction, with tensile strengths only up to about 2.8 MPa.
Fig. 3 is a drawing of the tensile properties of the nanocellulose aldehyde-free all-plant fiber density board in this example, where the tensile strength can reach 27MPa, which is far higher than the tensile strength of the natural eucalyptus wood pieces in the R direction.
Example 2
A preparation method of a nanocellulose aldehyde-free whole plant fiber density board comprises the following steps:
(1) firstly, putting the waste eucalyptus wood chips into a grinder for grinding, screening out the waste eucalyptus wood chips by using a sieve with the aperture of 80 meshes, and screening out the wood powder by using a sieve with the aperture of 100 meshes to obtain the wood powder;
(2) adding the wood flour obtained in the step (1) into water, performing water boiling treatment at the temperature of 100 ℃ for 1h, and drying to obtain the wood flour subjected to water boiling treatment;
(3) mixing the wood flour subjected to the water boiling treatment in the step (2) with dialdehyde nano cellulose (the oxidation degree is 25.3%), and mechanically stirring uniformly, wherein the oven-dry mass ratio of the wood flour subjected to the water boiling treatment to the dialdehyde nano cellulose is 5:1, and the oven-dry mass of the dialdehyde nano cellulose is 1g, so as to obtain a mixture; and transferring the mixture into a mold, naturally drying for 0.5h, then carrying out hot pressing treatment at the temperature of 95 ℃ and under the pressure of 20MPa for 10min, then removing the mold, and then carrying out hot pressing for 5min under the same temperature and pressure to obtain the nanocellulose aldehyde-free whole plant fiber density board.
The cellulose density board prepared in this example had a tensile strength of about 5.8MPa, an oxidation degree of dialdehyde nanocellulose of 25.3%, about 1/2 in example 1, an oven dry mass ratio of wood flour to dialdehyde nanocellulose of 5:1, which was 1/5 in example 1, and the density of aldol condensation was significantly reduced, resulting in a reduction in tensile strength. The cellulose density board produced in this example was less tensile than the density board of example 1, but was about 2 times stronger than the R-direction raw eucalyptus chips.
Example 3
A preparation method of a nanocellulose aldehyde-free whole plant fiber density board comprises the following steps:
(1) firstly, putting the waste eucalyptus wood chips into a grinder for grinding, screening out the waste eucalyptus wood chips by using a sieve with the aperture of 80 meshes, and screening out the wood powder by using a sieve with the aperture of 100 meshes to obtain the wood powder;
(2) adding the wood flour obtained in the step (1) into water, performing water boiling treatment at the temperature of 100 ℃ for 1h, and drying to obtain the wood flour subjected to water boiling treatment;
(3) mixing the wood flour subjected to the water boiling treatment in the step (2) with dialdehyde nano cellulose (the oxidation degree is 35.3%), and mechanically stirring uniformly, wherein the oven-dry mass ratio of the wood flour subjected to the water boiling treatment to the dialdehyde nano cellulose is 3:1, and the oven-dry mass of the dialdehyde nano cellulose is 1g, so as to obtain a mixture; and transferring the mixture into a mold, naturally drying for 1.5h, then carrying out hot pressing treatment at the temperature of 95 ℃ and under the pressure of 20MPa for 10min, then removing the mold, and then carrying out hot pressing for 5min under the same temperature and pressure to obtain the nanocellulose aldehyde-free whole plant fiber density board.
The cellulose density board prepared in the example has the tensile strength of about 7.5MPa, the oxidation degree of dialdehyde nano-cellulose is 35.3%, the oven dry mass ratio of wood powder to dialdehyde nano-cellulose is 3:1, the density of aldol condensation is intermediate between that of the example 1 and the example 2, and the reduction of the tensile strength is also between that of the example 1 and the example 2.
Example 4
A preparation method of a nanocellulose aldehyde-free whole plant fiber density board comprises the following steps:
(1) firstly, putting the waste eucalyptus wood chips into a grinder for grinding, screening out the waste eucalyptus wood chips by using a sieve with the aperture of 80 meshes, and screening out the wood powder by using a sieve with the aperture of 100 meshes to obtain the wood powder;
(2) adding the wood flour obtained in the step (1) into water, performing water boiling treatment at the temperature of 100 ℃ for 1h, and drying to obtain the wood flour subjected to water boiling treatment;
(3) mixing the wood flour subjected to the water boiling treatment in the step (2) with dialdehyde nano cellulose (the oxidation degree is 54.1%), and mechanically stirring uniformly, wherein the oven dry mass ratio of the wood flour subjected to the water boiling treatment to the dialdehyde nano cellulose is (1-5):1, and the oven dry mass of the dialdehyde nano cellulose is 1g, so as to obtain a mixture; and transferring the mixture into a mold, naturally drying for 0.5h, then carrying out hot pressing treatment at the temperature of 95 ℃ and under the pressure of 20MPa for 10min, then removing the mold, and then carrying out hot pressing for 5min under the same temperature and pressure to obtain the nanocellulose aldehyde-free whole plant fiber density board.
As shown in fig. 4, the change of tensile properties of the all-plant fiber density board in the mass ratio of the absolute dry amount of nanocellulose to wood flour. When the absolute dry mass ratio of the wood powder to the dialdehyde nano cellulose is 1 (1-5), when the mass ratio is increased, the aldehyde group of the dialdehyde nano cellulose with the same mass is crosslinked with more hydroxyl groups of the wood powder, the crosslinking density of aldol condensation is reduced, the bonding effect is reduced, and the tensile strength is reduced.
Example 5
(1) Firstly, putting the waste eucalyptus wood chips into a grinder for grinding, screening out the waste eucalyptus wood chips by using a sieve with the aperture of 80 meshes, and screening out the wood powder by using a sieve with the aperture of 100 meshes to obtain the wood powder;
(2) adding the wood flour obtained in the step (1) into water, performing water boiling treatment at the temperature of 100 ℃ for 1h, and drying to obtain the wood flour subjected to water boiling treatment;
(3) mixing the wood flour subjected to the water boiling treatment in the step (2) with dialdehyde nano cellulose (the oxidation degree is 20-60%), and mechanically stirring uniformly, wherein the oven-dry mass ratio of the wood flour subjected to the water boiling treatment to the dialdehyde nano cellulose is 1:1, and the oven-dry mass of the dialdehyde nano cellulose is 1g, so as to obtain a mixture; and transferring the mixture into a mold, naturally drying for 0.5h, then carrying out hot pressing treatment at the temperature of 95 ℃ and under the pressure of 20MPa for 10min, then removing the mold, and then carrying out hot pressing for 5min under the same temperature and pressure to obtain the nanocellulose aldehyde-free whole plant fiber density board.
As shown in fig. 5, the tensile property of the dialdehyde nanocellulose with different oxidation degrees of the full plant fiber density board is changed. When the oxidation degree of the dialdehyde nanocellulose is 20-60%, when the oxidation degree of the dialdehyde nanocellulose is increased, the hydroxyl groups of wood flour with the same mass are crosslinked with more aldehyde groups of the dialdehyde nanocellulose, the crosslinking density of aldol condensation is increased, the bonding effect is increased, and the tensile strength is increased.
The above examples are only preferred embodiments of the present invention, which are intended to be illustrative and not limiting, and those skilled in the art should understand that they can make various changes, substitutions and alterations without departing from the spirit and scope of the invention.
Claims (10)
1. A preparation method of a nanocellulose aldehyde-free whole plant fiber density board is characterized by comprising the following steps:
(1) crushing and sieving the waste fibers to obtain wood powder;
(2) adding the wood powder obtained in the step (1) into water, performing water boiling treatment, and drying to obtain the wood powder subjected to water boiling treatment;
(3) uniformly mixing the wood flour subjected to the water boiling treatment in the step (2) with dialdehyde nano cellulose to obtain a mixture; and transferring the mixture into a mold, naturally drying in the air, and then carrying out hot pressing treatment to obtain the nanocellulose aldehyde-free whole plant fiber density board.
2. The method for preparing the nanocellulose aldehyde-free whole plant fiber density board as claimed in claim 1, wherein the waste fibers in step (1) are one or more of eucalyptus wood chips, bamboo chips, bagasse and straw.
3. The method for preparing the nanocellulose aldehyde-free whole plant fiber density board as claimed in claim 1, wherein the screening in step (1) comprises: the crushed fiber is firstly screened by a sieve with the aperture of 80 meshes and then screened by a sieve with the aperture of 100 meshes.
4. The method for preparing the nanocellulose aldehyde-free whole plant fiber density board as claimed in claim 1, wherein the temperature of the water boiling treatment in the step (2) is 95-105 ℃.
5. The method for preparing the nanocellulose aldehyde-free whole plant fiber density board as claimed in claim 1, wherein the time of the water boiling treatment in step (2) is 1.0-2.0 h.
6. The method for preparing the nanocellulose aldehyde-free whole plant fiber density board as claimed in claim 1, wherein the degree of oxidation of the dialdehyde nanocellulose in the step (3) is 20-60%.
7. The preparation method of the nanocellulose aldehyde-free whole plant fiber density board as claimed in claim 1, wherein the oven-dry mass ratio of wood flour after the water boiling treatment in step (3) to dialdehyde nanocellulose is 1: (1-5).
8. The method for preparing the nanocellulose aldehyde-free whole plant fiber density board as claimed in claim 1, wherein the natural air drying time in step (3) is 0.5-3.0 h.
9. The preparation method of the nanocellulose aldehyde-free whole plant fiber density board as claimed in claim 1, wherein the temperature of the hot pressing treatment in step (3) is 90-100 ℃, the time of the hot pressing treatment is 5-20min, and the pressure of the hot pressing treatment is 15-20 MPa.
10. A nanocellulose aldehyde-free whole plant fiber density board produced by the method of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110449105.5A CN113510819A (en) | 2021-04-25 | 2021-04-25 | Aldehyde-free all-plant fiber density board based on nanocellulose and preparation method thereof |
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