CN117774071A - Wood composite modification process based on graphene oxide silicon dioxide - Google Patents
Wood composite modification process based on graphene oxide silicon dioxide Download PDFInfo
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- CN117774071A CN117774071A CN202311743975.9A CN202311743975A CN117774071A CN 117774071 A CN117774071 A CN 117774071A CN 202311743975 A CN202311743975 A CN 202311743975A CN 117774071 A CN117774071 A CN 117774071A
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- 239000002023 wood Substances 0.000 title claims abstract description 127
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 79
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 79
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 61
- 239000002131 composite material Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000008569 process Effects 0.000 title claims abstract description 24
- 230000004048 modification Effects 0.000 title claims abstract description 20
- 238000012986 modification Methods 0.000 title claims abstract description 20
- 235000012239 silicon dioxide Nutrition 0.000 title claims abstract description 9
- 239000003607 modifier Substances 0.000 claims abstract description 37
- 238000003756 stirring Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 238000005470 impregnation Methods 0.000 claims abstract description 22
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000006185 dispersion Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 230000007935 neutral effect Effects 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 15
- 239000008367 deionised water Substances 0.000 claims abstract description 14
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims description 6
- 238000011056 performance test Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- 241000233866 Fungi Species 0.000 description 3
- 230000021736 acetylation Effects 0.000 description 3
- 238000006640 acetylation reaction Methods 0.000 description 3
- 210000002421 cell wall Anatomy 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 2
- 241000256602 Isoptera Species 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 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 2
- 235000013871 bee wax Nutrition 0.000 description 2
- 239000012166 beeswax Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Abstract
The invention discloses a wood composite modification process based on graphene oxide silicon dioxide, which comprises the following steps of: preparing a material, namely preparing graphene oxide dispersion liquid, a neutral silica sol solution and deionized water; preparing a graphene oxide-silicon dioxide composite modifier, namely adding the prepared graphene oxide dispersion liquid and neutral silica sol solution into the same container to perform first stirring and mixing, and then adding deionized water to perform second stirring and mixing to obtain the graphene oxide-silicon dioxide composite modifier; vacuum-pressurizing impregnation treatment; drying the wood, taking the wood out of the vacuum pressurizing and impregnating equipment, and drying the wood to constant weight; testing performance; and (5) storing. According to the invention, the graphene oxide-silicon dioxide composite modifier is used for modifying wood, so that the water absorbability of the wood is reduced, the dimensional stability and the surface hardness of the wood are improved, and the problems of complicated preparation process, single product function, unfriendly environment of the modifying agent and the like of the traditional modifier are effectively solved.
Description
Technical Field
The invention relates to the technical field of wood composite modification preparation, in particular to a wood composite modification process based on graphene oxide silicon dioxide.
Background
Wood is a natural green material with tremendous storage in nature. As a building material widely used in indoor and outdoor, wood has many excellent properties such as low density, large strength to weight ratio, beautiful grain, low processing energy consumption and excellent environmental compatibility. However, under the new situation that the supply of world high-quality wood resources is reduced and the natural forest in China is completely forbidden, wood resources commonly used in solid wood processing are severely restricted, and the artificial fast-growing wood is a main raw material of the wood industry in China, and although the artificial forest with the largest world area is owned by China, the artificial wood is soft in material, low in strength, small in density, unattractive in texture and color, and easy to deform and crack and fungus and rot in the environment, and the defects limit the use value and application range of the artificial fast-growing wood to a certain extent.
In the prior art, several methods for treating wood have been proposed, such as:
the principle of the acetylation modification of wood is that an acetylation reagent is utilized to carry out esterification reaction with wood hydroxyl groups, and the wood absorbs water because hydrogen bonds are easily formed between cell wall polymer hydroxyl groups and water molecules, so that the acetylated wood has the advantages of good dimensional stability, corrosion resistance and the like, but the disadvantages of the acetylation modified wood are obvious, namely, acetic acid is generated in the reaction process, unreacted acetic anhydride is also generated, cellulose and hemicellulose are easy to explain under the acidic condition, and the strength of the wood is further reduced.
The method can improve the surface hardness and wear resistance of the fast-growing wood by using the formaldehyde-containing urea-formaldehyde resin as the surface material treating agent for strengthening and modifying the wood surface, but the formaldehyde release problem exists in the process of manufacturing and using the urea-formaldehyde resin as the modifying agent, so that the health of people is seriously affected, and the method does not meet the environment-friendly requirement.
The method has the advantages that the siloxane precursor is used for treating the cell wall of the wood, so that the thermal stability and the dimensional stability of the wood are improved, but the operation process of the method is complex, and the corrosion resistance, the water resistance, the flame retardance, the weather resistance and the like of the wood cannot be obviously improved simultaneously.
Treatment of wood with beeswax imparts hydrophobicity to wood, but beeswax is poor in thermal stability and cannot last long in hydrophobic efficacy; and has little beneficial improvement on the performances of flame retardance, corrosion resistance, weather resistance and the like of the wood.
Based on the defects of the prior art method, the invention provides a wood composite modification process based on graphene oxide silicon dioxide, which aims to solve the problems of complicated preparation process, single product function, unfriendly environment of a modification reagent and the like of the traditional modifier.
Disclosure of Invention
The invention aims to provide a wood composite modification process based on graphene oxide silicon dioxide, which is used for modifying wood through a graphene oxide-silicon dioxide composite modifier, so that the water absorption of the wood is reduced, the dimensional stability and the surface hardness of the wood are improved, and the problems of complicated preparation process, single product function, unfriendly modified reagent environment and the like of the traditional modifier are effectively solved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a wood composite modification process based on graphene oxide silicon dioxide comprises the following steps:
preparing a material, namely preparing graphene oxide dispersion liquid, a neutral silica sol solution and deionized water;
step two, preparing a graphene oxide-silicon dioxide composite modifier, namely adding the prepared graphene oxide dispersion liquid and neutral silica sol solution into the same container to perform first stirring and mixing, and then adding deionized water to perform second stirring and mixing to obtain the graphene oxide-silicon dioxide composite modifier;
step three, vacuum-pressurization impregnation treatment, which comprises the following steps:
firstly, wood is pretreated, and the wood is placed into vacuum pressurizing impregnation equipment for vacuumizing;
filling the graphene oxide-silicon dioxide composite modifier, filling the graphene oxide-silicon dioxide composite modifier into vacuum pressurizing impregnation equipment, and releasing the vacuum degree;
step three, pressurizing treatment, namely continuously pressurizing treatment on the vacuum pressurizing and impregnating equipment by using a pulse type pressurizing pump, so that the graphene oxide-silicon dioxide composite modifier can be fully immersed into the wood tissue structure;
step four, drying the wood, taking the wood out of the vacuum pressurizing and impregnating equipment, and drying the wood to constant weight to obtain graphene oxide-silicon dioxide modified wood;
step five, performance testing is carried out on the prepared graphene oxide-silicon dioxide modified wood;
and step six, storing, namely storing graphene oxide-silicon dioxide modified timber which is qualified in performance test.
Preferably, in the first step, in the preparation of the material, the weight ratio of the graphene oxide dispersion liquid is 0.25wt%, and the weight ratio of the neutral silica sol solution is 30wt%.
Preferably, in the preparation of the graphene oxide-silicon dioxide composite modifier, the mixing ratio of the graphene oxide dispersion liquid is 10%, the mixing ratio of the neutral silica sol solution is 5% -20%, and the mixing ratio of the deionized water is 70% -85%.
Preferably, in the preparation of the graphene oxide-silicon dioxide composite modifier, the stirring speed of the first stirring and mixing is controlled to be 200-250 r/min, the stirring time is controlled to be 20-30 min, and the stirring speed of the second stirring and mixing is controlled to be 100-200 r/min, and the stirring time is controlled to be 40-60 min.
Preferably, in the step three, in the process of vacuum-pressure impregnation treatment, namely wood pretreatment, the vacuum degree of the vacuum-pressure impregnation equipment is-0.1 MPa, and the wood pretreatment is kept for 30min.
Preferably, in the third pressurizing treatment of the vacuum-pressurizing impregnation treatment, the vacuum degree of the vacuum pressurizing impregnation equipment is 2.5MPa, and the time is 2.5h.
Preferably, in the fourth step, the timber is dried, and the timber is taken out, then is firstly dried by air drying at room temperature for 48 hours, and is then dried in an oven at the temperature of 103+/-2 ℃ until the weight is constant.
Preferably, in the step five, in the performance test, the test indexes of the graphene oxide-silicon dioxide modified wood comprise:
horizontal combustion (stage) HB stage;
limiting Oxygen Index (LOI) is more than or equal to 25.0 percent;
the expansion and contraction resistance rate is more than or equal to 85 percent;
the bending strength is more than or equal to 50MPa.
Compared with the prior art, the invention has the following beneficial effects:
the method for improving the performance of carbonized wood by using silica sol impregnating pretreatment reduces the mass loss rate of the carbonized wood, reduces the balanced water content, and improves the dimensional stability and termite resistance.
The invention develops a composite modifier for modifying wood, thereby reducing the water absorption of the wood, improving the dimensional stability and the surface hardness of the wood, and effectively solving the problems of complicated preparation process, single product function, unfriendly environment of a modifying agent and the like of the traditional modifier.
The invention carries out vacuum-pressurizing impregnation treatment by the compound solution, improves the dimensional stability, surface hardness and flame retardance of the wood, prolongs the service life of furniture, reduces the loss of the wood, improves the value of the wood, and can be widely applied to high-grade furniture manufacturing, high-grade home decoration and the like.
According to the modified wood prepared by the graphene oxide-silicon dioxide composite modifier, the moisture absorption groups are reduced, the graphene oxide-silicon dioxide composite modifier blocks the pipelines and the pores in the wood, the occurrence of recognition of fungus and insect on the wood substrate is reduced, and the anti-corrosion performance of the wood is improved.
The invention can directly impregnate and pretreat the raw wood or the air-dried wood without predrying, thereby simplifying the preparation process and reducing the production cost.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
FIG. 1 is an overall process flow diagram of the present invention;
FIG. 2 is a flow chart of the vacuum-pressurized impregnation process of the present invention;
FIG. 3 is a block diagram of the formulation of the graphene oxide-silica composite modifier of the present invention;
FIG. 4 is a graph showing the test index of graphene oxide-silica modified wood according to the present invention.
Detailed Description
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
Referring to fig. 1 to 4, the present invention preferably provides the following technical solutions:
a wood composite modification process based on graphene oxide silicon dioxide comprises the following steps:
preparing a material, namely preparing graphene oxide dispersion liquid, a neutral silica sol solution and deionized water, wherein the weight ratio of the graphene oxide dispersion liquid is 0.25wt%, and the weight ratio of the neutral silica sol solution is 30wt%;
adding the prepared graphene oxide dispersion liquid and neutral silica sol solution into the same container for first stirring and mixing, and then adding deionized water for second stirring and mixing to obtain the graphene oxide-silica composite modifier, wherein the mixing ratio of the graphene oxide dispersion liquid is 10%, the mixing ratio of the neutral silica sol solution is 5% -20%, the mixing ratio of deionized water is 70% -85%, in addition, the stirring speed of the first stirring and mixing is controlled to be 200-250 r/min, the stirring time is controlled to be 20-30 min, the stirring speed of the second stirring and mixing is controlled to be 100-200 r/min, and the stirring time is controlled to be 40-60 min;
step three, vacuum-pressurization impregnation treatment, which comprises the following steps:
firstly, wood is pretreated, the wood is placed into vacuum pressurizing and impregnating equipment, vacuumizing is carried out, the vacuum degree of the vacuum pressurizing and impregnating equipment is minus 0.1MPa, and the wood is kept for 30min;
filling the graphene oxide-silicon dioxide composite modifier, filling the graphene oxide-silicon dioxide composite modifier into vacuum pressurizing impregnation equipment, and releasing the vacuum degree;
step three, pressurizing treatment, namely continuously pressurizing treatment is carried out on vacuum pressurizing and impregnating equipment by using a pulse type pressurizing pump, so that the graphene oxide-silicon dioxide composite modifier can be fully immersed into the wood tissue structure, wherein the vacuum degree of the vacuum pressurizing and impregnating equipment is 2.5MPa, and the time is 2.5h;
step four, drying the wood, namely taking the wood out of vacuum pressurizing impregnation equipment, drying the wood to constant weight to obtain graphene oxide-silicon dioxide modified wood, specifically, taking the wood out, firstly placing the wood at room temperature for air drying for 48 hours, and then placing the wood in an oven at 103+/-2 ℃ for drying treatment to constant weight;
step five, performance testing is carried out on the prepared graphene oxide-silicon dioxide modified wood, and the testing indexes of the graphene oxide-silicon dioxide modified wood comprise:
horizontal combustion (stage) HB stage;
limiting Oxygen Index (LOI) is more than or equal to 25.0 percent;
the expansion and contraction resistance rate is more than or equal to 85 percent;
the bending strength is more than or equal to 50MPa;
and step six, storing, namely storing graphene oxide-silicon dioxide modified timber which is qualified in performance test, wherein the storage environment is subjected to ventilation drying.
Based on the above-described process, a process for preparing,
the preparation method comprises the steps of selecting 10% of graphene oxide dispersion liquid (0.25 wt%) 5% -20% of neutral silica sol solution (30 wt%) and 70% -85% of deionized water to form a graphene oxide-silica composite modifier, wherein the graphene oxide surface contains rich oxygen-containing functional groups, when the graphene oxide dispersion liquid is mixed with the neutral silica sol, hydroxyl groups, carboxyl groups and epoxy groups on the graphene oxide surface are combined with hydroxyl groups on the silica microsphere surface to form a large number of hydrogen bonds, adding a certain proportion of deionized water for dilution, and stably combining the graphene oxide and the silica into a nanoscale gel solution, so that the nanoscale gel solution can be filled in wood, and has good hardness and strength after the gel solution is dried, thereby improving the mechanical strength of the wood, and meanwhile, the gel itself has good flame retardant property, and is present in a pore canal in the wood, so that the contact surface between the wood and the air is reduced, and the flame retardant property of the wood is improved.
Through vacuum-pressurizing impregnation treatment, the graphene oxide-silicon dioxide composite modifier can be fully immersed into the wood tissue structure, and the graphene oxide-silicon dioxide composite modifier entering the wood can be combined with the hydroxyl of the cell wall polymer to form a new hydrogen bond, so that the moisture absorption group is reduced, and meanwhile, the combining opportunity of the wood and water molecules is greatly reduced, so that the dimensional stability of the wood is improved.
Therefore, the modified wood prepared by the graphene oxide-silicon dioxide composite modifier has the advantages that the moisture absorption groups are reduced, the graphene oxide-silicon dioxide composite modifier blocks the pipelines and pores inside the wood, the occurrence of recognition of fungus and insect on the wood matrix is reduced, the anti-corrosion performance of the wood is improved, in addition, the wood does not need to be pre-dried, the raw wood or the air-dried wood can be directly subjected to infusion pretreatment, the preparation process is simplified, and the production cost is reduced.
Furthermore, the method for improving the performance of carbonized wood by using the silica sol impregnating pretreatment reduces the mass loss rate of the carbonized wood, reduces the balanced water content, improves the dimensional stability and termite resistance, and effectively avoids the problem because the production cost is too high and the property of the wood is affected to a certain extent by the too high silica sol concentration when the concentration of the used silica sol reaches 20-50%, and further, the concentration ratio of 10% of graphene oxide dispersion liquid (0.25 wt%) to 5-20% of neutral silica sol solution (30 wt%) to 70-85% of deionized water is selected.
The invention develops a composite modifier for modifying wood, thereby reducing the water absorption of the wood, improving the dimensional stability and the surface hardness of the wood, and effectively solving the problems of complicated preparation process, single product function, unfriendly environment of a modifying agent and the like of the traditional modifier. The vacuum-pressurizing impregnation treatment is carried out by the compound solution, so that the dimensional stability, the surface hardness and the flame retardance of the wood are improved, the service life of furniture is prolonged, the loss of the wood is reduced, the value of the wood is improved, and the method can be widely applied to high-grade furniture manufacturing, high-grade home decoration and the like.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The detachable mounting mode is various, for example, the detachable mounting mode can be matched with the buckle through plugging, for example, the detachable mounting mode can be realized through a bolt connection mode, and the like.
The conception, specific structure, and technical effects produced by the present invention are clearly and completely described above in connection with the embodiments and the drawings so as to fully understand the objects, features, and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention. In addition, all coupling/connection relationships mentioned herein do not refer to direct connection of the components, but rather, refer to the fact that a more optimal coupling structure may be formed by adding or subtracting coupling aids depending on the particular implementation.
The foregoing embodiments are provided for further explanation of the present invention and are not to be construed as limiting the scope of the present invention, and some insubstantial modifications and variations of the present invention, which are within the scope of the invention, will be suggested to those skilled in the art in light of the foregoing teachings.
Claims (8)
1. The wood composite modification process based on the graphene oxide silicon dioxide is characterized by comprising the following steps of:
preparing a material, namely preparing graphene oxide dispersion liquid, a neutral silica sol solution and deionized water;
step two, preparing a graphene oxide-silicon dioxide composite modifier, namely adding the prepared graphene oxide dispersion liquid and neutral silica sol solution into the same container to perform first stirring and mixing, and then adding deionized water to perform second stirring and mixing to obtain the graphene oxide-silicon dioxide composite modifier;
step three, vacuum-pressurization impregnation treatment, which comprises the following steps:
firstly, wood is pretreated, and the wood is placed into vacuum pressurizing impregnation equipment for vacuumizing;
filling the graphene oxide-silicon dioxide composite modifier, filling the graphene oxide-silicon dioxide composite modifier into vacuum pressurizing impregnation equipment, and releasing the vacuum degree;
step three, pressurizing treatment, namely continuously pressurizing treatment on the vacuum pressurizing and impregnating equipment by using a pulse type pressurizing pump, so that the graphene oxide-silicon dioxide composite modifier can be fully immersed into the wood tissue structure;
step four, drying the wood, taking the wood out of the vacuum pressurizing and impregnating equipment, and drying the wood to constant weight to obtain graphene oxide-silicon dioxide modified wood;
step five, performance testing is carried out on the prepared graphene oxide-silicon dioxide modified wood;
and step six, storing, namely storing graphene oxide-silicon dioxide modified timber which is qualified in performance test.
2. The graphene oxide silica-based wood composite modification process according to claim 1, wherein: in the first step, in the material preparation, the weight ratio of the graphene oxide dispersion liquid is 0.25wt%, and the weight ratio of the neutral silica sol solution is 30wt%.
3. The graphene oxide silica-based wood composite modification process according to claim 1, wherein: in the preparation of the graphene oxide-silicon dioxide composite modifier, the mixing ratio of the graphene oxide dispersion liquid is 10%, the mixing ratio of the neutral silica sol solution is 5% -20%, and the mixing ratio of the deionized water is 70% -85%.
4. The graphene oxide silica-based wood composite modification process according to claim 1, wherein: in the preparation of the graphene oxide-silicon dioxide composite modifier, the stirring speed of the first stirring and mixing is controlled to be 200-250 r/min, the stirring time is controlled to be 20-30 min, and the stirring speed of the second stirring and mixing is controlled to be 100-200 r/min, and the stirring time is controlled to be 40-60 min.
5. The graphene oxide silica-based wood composite modification process according to claim 1, wherein: step three, in the wood pretreatment process of the vacuum-pressurization impregnation treatment, the vacuum degree of the vacuum pressurization impregnation equipment is-0.1 MPa, and the wood pretreatment is kept for 30min.
6. The graphene oxide silica-based wood composite modification process according to claim 1, wherein: and step three, in the process three pressurizing treatment of the vacuum-pressurizing impregnation treatment, the vacuum degree of the vacuum pressurizing impregnation equipment is 2.5MPa, and the time is 2.5h.
7. The graphene oxide silica-based wood composite modification process according to claim 1, wherein: and step four, in the wood drying process, the wood is firstly dried for 48 hours at room temperature after being taken out, and then is put into a drying oven at 103+/-2 ℃ for drying treatment until the weight is constant.
8. The graphene oxide silica-based wood composite modification process according to claim 1, wherein: in the performance test, the test indexes of the graphene oxide-silicon dioxide modified wood comprise:
horizontal combustion (stage) HB stage;
limiting Oxygen Index (LOI) is more than or equal to 25.0 percent;
the expansion and contraction resistance rate is more than or equal to 85 percent;
the bending strength is more than or equal to 50MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311743975.9A CN117774071A (en) | 2023-12-19 | 2023-12-19 | Wood composite modification process based on graphene oxide silicon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311743975.9A CN117774071A (en) | 2023-12-19 | 2023-12-19 | Wood composite modification process based on graphene oxide silicon dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117774071A true CN117774071A (en) | 2024-03-29 |
Family
ID=90397370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311743975.9A Pending CN117774071A (en) | 2023-12-19 | 2023-12-19 | Wood composite modification process based on graphene oxide silicon dioxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117774071A (en) |
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2023
- 2023-12-19 CN CN202311743975.9A patent/CN117774071A/en active Pending
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