CN114621637A - Nano-cellulose interpenetration Mxene composite material, preparation method and application thereof - Google Patents
Nano-cellulose interpenetration Mxene composite material, preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of fire early warning and flame retardant materials, and relates to a nano-cellulose interpenetration Mxene composite material, a preparation method and application thereof. Aiming at the technical problems that the resistance and the temperature of an MXene early warning coating material in the prior art do not have laziness, the MXene also has conductive capacity at normal temperature and low temperature and the MXene cannot respond to the fire site temperature, the preparation method has the advantages that the nano-cellulose is interpenetrated with the Mxene, and the prepared composite material can block the conductive capacity of the MXene at normal temperature and low temperature. The application also provides a preparation method of the nano-cellulose interpenetration Mxene composite material and application of the nano-cellulose interpenetration Mxene composite material in preparation of fire early warning wood, the nano-cellulose interpenetration Mxene composite material is applied to wood and the like, and an MXene conductive network is connected when a fire disaster occurs, so that an early warning signal is sent out in time.
Description
Technical Field
The invention belongs to the technical field of fire early warning and flame retardant materials, and particularly relates to a nano-cellulose interpenetration Mxene composite material, a preparation method and application thereof.
Background
The wood has the characteristics of high weight ratio, decoration, easy processing and the like, is environment-friendly, is widely applied to industries such as buildings, decoration, furniture, transportation and the like, and is shared with human development. The flame-retardant coating is endowed on the surface of the wood, which is a way for effectively improving the flame-retardant performance, and the related technology shows that in the flame-retardant treatment process of the wood, the material capable of identifying the temperature and the fire is introduced into the system and is tightly combined with the wood substrate, so that the wood has the capability of 'actively' identifying the fire, sending a fire early warning signal and simultaneously keeping the original flame-retardant performance.
At present, an early warning coating constructed by taking Graphene Oxide (GO) as a representative has a working principle of mainly identifying and responding to temperature changes generated during fire, converting temperature signals into receivable electric signals and transmitting the electric signals to the outside. Specifically, GO is an intermediate product in the graphene synthesis process by a redox method, oxygen-containing functional groups such as hydroxyl, carboxyl and epoxy groups are grafted on the surface of GO, the original graphene conjugated network is seriously functionalized, and the resistance of GO is significantly higher than that of the original graphene. Under normal conditions, the conductive loops are not communicated because the GO has higher resistance; once a fire disaster occurs, the surface temperature of the material rapidly reaches the ignition temperature (220-500 ℃), GO in the coating is heated to generate a reduction reaction, oxygen-containing functional groups on the surface gradually lose, the resistance between electrodes near the ignition point rapidly reduces, and a conductive loop is connected, so that the timely early warning of the fire disaster is realized. However, the thermal reduction reaction of graphene oxide requires more than 200 ℃, and generally requires more than 400 ℃ to achieve a sufficiently rapid reduction speed. Therefore, the graphene oxide-based thermal resistance response fire early warning flame-retardant coating cannot effectively monitor and early warn the temperature rise stage before ignition.
MXene is a new two-dimensional (2D) material belonging to the transition metal carbo/nitrides. MXene series materials have expanded rapidly since their discovery in 2011. MXene is formed by selective etching of the a layer from its MAX phase with the formula Mn +1AXn (N ═ 1, 2, 3), where M represents an early transition metal, a is typically a main group element, X is carbon (C), nitrogen (N), or both, and the larger the value of N the more stable the corresponding MXene. Generally, functional groups (-OH, -F, -O, etc.) generated during etching impart good hydrophilicity to MXene, but do not significantly affect its excellent conductivity properties (conductivity can exceed 10000S/cm). MXene has the properties of hydrophilicity and adjustable surface (functional group) structure, and shows great application prospects in the fields of energy storage, catalysis, sensing, electromagnetic shielding, environmental management and the like. For example, the Chinese patent application publication No. CN113522698A, having application date of 14/07/2021, has the name: a cellulose nanocrystal/MXene self-assembly flame-retardant antistatic coating and application thereof to glass fiber reinforced plastics disclose that a flame-retardant antistatic coating is obtained by self-assembly of a phosphoric acid-containing doped nitrogen-containing polymer coated cellulose nanocrystal and MXene stripped with the assistance of polyphenol. MXene has excellent conductivity and good conductivity at room temperature, but it does not have temperature dependency on resistance, and cannot respond to fire (field temperature), which is also a disadvantage of this solution.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the technical problems that the resistance and the temperature of an MXene early warning coating material in the prior art do not have laziness, the MXene also has conductive capacity at normal temperature and low temperature and the MXene cannot respond to the fire site temperature, the preparation method has the advantages that the nano-cellulose is interpenetrated with the Mxene, and the prepared composite material can block the conductive capacity of the MXene at normal temperature and low temperature. The application also provides a preparation method of the nano-cellulose interpenetration Mxene composite material and application of the nano-cellulose interpenetration Mxene composite material in preparation of fire early warning wood, the nano-cellulose interpenetration Mxene composite material is applied to wood and the like, and an MXene conductive network is connected when a fire disaster occurs, so that an early warning signal is sent out in time.
2. Technical scheme
In order to achieve the purpose, the technical scheme is as follows:
the invention relates to a nano-cellulose interpenetration Mxene composite material, which comprises nano-cellulose and Mxene; the weight ratio of the nano-cellulose to the Mxene is 5: 1-1: 1; the mass fraction of the nano-cellulose and the Mxene is 0.8-1.5%.
Preferably, the weight ratio of the nanocellulose to Mxene is 3: 1.
Preferably, the nanocellulose is selected from cellulose nanocrystals or cellulose nanofibrils.
A preparation method of a nano-cellulose interpenetrated Mxene composite material comprises the following steps:
comprises the following steps of preparing nano cellulose colloid: dispersing nano-cellulose in a solvent to obtain a nano-cellulose colloid with the mass fraction of 1-5%, and adjusting the pH value to 7-7.5;
comprises the steps of preparing MXene solution: dispersing MXene solvent to obtain MXene solution with the mass fraction of 4-6.5 mg/mL;
and mixing and dispersing the nano cellulose colloid and the MXene solution according to the solid content weight ratio of 5: 1-1: 1 to obtain the nano cellulose interpenetration Mxene composite material with the mass fraction of 0.8-1.5%.
Preferably, the nano-cellulose and the solvent are weighed, ultrasonic dispersion is carried out, the power is 800-1000 w, the time is 10-30 min, the nano-cellulose colloid with the concentration of 1-5% is obtained, and the pH value of the nano-cellulose colloid is adjusted to 7-7.5.
Preferably, MXene and a solvent are weighed and subjected to ultrasonic dispersion at the power of 500-800 w for 10-20 min to obtain an MXene solution with the concentration of 4-6.5 mg/mL.
Preferably, the nano cellulose colloid and the MXene solution are weighed according to the solid content weight ratio of 3:1, ultrasonic dispersion is carried out, the power is 800-1000 w, the time is 10-30 min, and the nano cellulose interpenetrated Mxene composite material with the concentration of 0.8-1.5% is obtained.
Preferably, the solvent is deionized water.
Further, the Mxene is Ti3C2Tx MXene。
Preferably, the Ti is3C2Tx MXene was prepared by the following steps:
(1) weighing 10mL of deionized water and 30mL of concentrated hydrochloric acid (12M) in a 100mL polytetrafluoroethylene beaker to obtain 9M hydrochloric acid solution, weighing 2g of LiF powder, slowly adding the LiF powder into the hydrochloric acid solution, and magnetically stirring for 1h to completely dissolve the LiF;
(2) weighing 2g of Ti3AlC2Slowly adding the powder into the solution, magnetically stirring for 10min, transferring the polytetrafluoroethylene beaker into a 35 ℃ water bath kettle, and magnetically stirring for 24h to remove the Al layer by etching;
(3) diluting the above reaction product with deionized water, centrifuging at 3500rmp for 5min, repeatedly cleaning the obtained precipitate with deionized water until the supernatant is no longer transparent, and turns into dark green, and has pH value>Collecting the bottom precipitate to obtain Ti3C2Tx clay;
(4) to Ti3C2Adding 200mL of deionized water into Tx clay, performing water bath ultrasound for 20min, centrifuging the dispersion liquid after ultrasound for 20min at the rotating speed of 3500rmp, and obtaining upper-layer dark green liquid, namely few-layer Ti3C2Tx dispersion, which was collected and stored sealed in a refrigerator at 4 ℃.
An application of a nano-cellulose interpenetration Mxene composite material in preparing fire early warning wood.
Further, the nano-cellulose interpenetration Mxene composite material is coated on the surface of the wood, and the coating amount of the nano-cellulose interpenetration Mxene composite material is 6.4-32 g/m2And obtaining the wood with the early warning layer.
And further, coating the nano-cellulose interpenetration Mxene composite material on the surface of the wood, and repeatedly brushing and drying for 2-10 times to obtain the wood with the early warning layer.
Preferably, after coating, drying is carried out for 45-60 min at 50-60 ℃, and the coating and drying are repeated for 6 times.
Further, between the wood and the early warning layer, a bidirectional cross-linking layer close to the wood and a flame-retardant layer close to the early warning layer are further included.
Further, the two-way cross-linked layer is selected from polydopamine, polyethyleneimine, chitosan or amine groupOne or more of glycidyl ethers; the coating amount of the two-way cross-linked layer is 2.5-7.5 g/m2。
Further, the flame-retardant layer is prepared from a phosphorus-containing and nitrogen-containing polyelectrolyte solution; the phosphorus-containing and nitrogen-containing polyelectrolyte solution comprises one or more of ammonium polyphosphate, sodium polyphosphate or phosphorylated chitin; the coating amount of the flame-retardant layer is 81.12-121.68 g/m2。
Preferably, the wood containing the two-way cross-linked layer is soaked in the phosphorus-containing and nitrogen-containing polyelectrolyte solution for 5min, dried for 10-30 min at 50-60 ℃, repeatedly soaked and dried for 8-12 times.
Further, the early warning device also comprises a hydrophobic protective layer coated on the surface of the early warning layer.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the composite material with the nanocellulose and the Mxene interpenetrated comprises the nanocellulose and the Mxene, the weight ratio of the nanocellulose to the Mxene is 5: 1-1: 1, and the mass fraction of the nanocellulose to the Mxene is 0.8-1.5%. Compared with the technical problems that the resistance and the temperature of the MXene early warning coating material in the prior art do not have the independency, the MXene also has the conductive capability at normal temperature and low temperature and cannot respond to the fire scene temperature, the nano-cellulose is interpenetrated with the Mxene, and the prepared composite material can block the conductive capability of the MXene at normal temperature and low temperature. And solves the problems of easy stacking, easy oxidation and difficult storage of MXene at normal temperature.
(2) The preparation method of the nano-cellulose interpenetration Mxene composite material comprises the steps of firstly preparing a nano-cellulose colloid and an MXene solution, then mixing the nano-cellulose colloid and the MXene solution according to the solid content weight ratio of 5: 1-1: 1, and then dispersing to obtain the nano-cellulose interpenetration Mxene composite material with the mass fraction of 0.8-1.5%, wherein the preparation process is simple and efficient.
(3) The application of the nano-cellulose interpenetration Mxene composite material is to coat the nano-cellulose interpenetration Mxene composite material onThe coating amount on the surface of the wood is 6.4-32 g/m2And repeatedly brushing and drying for 2-10 times to obtain the wood with the early warning layer, wherein the nano-cellulose has no conductive capability, so that the conductive capability of MXene at normal temperature and low temperature (200 ℃) can be blocked, and when a fire disaster occurs, the nano-cellulose is rapidly pyrolyzed and carbonized due to rapid temperature rise (the actual measurement temperature is 230-250 ℃), the conductive network is connected, and an early warning signal is sent out in time. Performance tests show that when the fire source is contacted, the time for triggering the early warning signal is only 2.2s, and ultra-sensitive early warning is realized.
Drawings
Fig. 1 is a schematic view of a wood with fire identification and flame retardant functions.
Fig. 2 is a diagram of a fire response early warning device of wood with fire recognition and flame retardant functions.
Fig. 3 is a schematic diagram of CNC (cellulose nanocrystalline) interpenetrating MXene molecular interlamination.
FIG. 4 shows the negative temperature-resistance change behavior of CNC (cellulose nanocrystal)/MXene nanocomposites.
FIG. 5 is a morphology diagram and an element composition diagram of functional layers of the flame-retardant early warning wood.
In fig. 5:
(a-d) appearance diagrams of the cross sections of all functional layers of the flame-retardant early warning wood:
(a) the wood is made of pure wood,
(b) wood coated with a bi-directional cross-linked layer of polyethyleneimine,
(c) wood coated with polyethyleneimine and ammonium polyphosphate,
(d) coated with polyethyleneimine, ammonium polyphosphate, CNC/MXene.
(e) d partial magnification of the plot for spectroscopy.
(f-k) flame retardant early warning timber cross section EDS map:
(f) a general distribution diagram of each element; (g) c; (h) n; (i) o; (j) p; (k) and (3) Ti.
(l) And (4) a top view of the appearance of the flame-retardant early warning wood.
Detailed Description
The invention is further described with reference to specific examples.
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The method for preparing the Mxene composite material with the interpenetrated nanocellulose comprises the following steps:
(1) weighing nano-cellulose and deionized water, carrying out ultrasonic dispersion with the power of 800-1000 w for 10-30 min to obtain 1-5% nano-cellulose colloid, adjusting the pH value of the nano-cellulose colloid to 7-7.5,
(2) weighing MXene and deionized water, performing ultrasonic dispersion at a power of 500-800 w for 10-20 min to obtain MXene solution with a concentration of 4-6.5 mg/mL,
(3) and (3) weighing the nano cellulose colloid in the step (1) and the MXene solution in the step (2) according to the solid content ratio of 3:1, and performing ultrasonic dispersion at the power of 800-1000 w for 10-30 min to obtain the nano cellulose/MXene mixed solution with the concentration of 0.8-1.5%.
The Mxene is Ti3C2Tx MXene, prepared by the following steps:
(1) weighing 10mL of deionized water and 30mL of concentrated hydrochloric acid (12M) in a 100mL polytetrafluoroethylene beaker to obtain 9M hydrochloric acid solution, weighing 2g of LiF powder, slowly adding the LiF powder into the hydrochloric acid solution, and magnetically stirring for 1h to completely dissolve the LiF;
(2) weighing 2g of Ti3AlC2Slowly adding the powder into the solution, magnetically stirring for 10min, transferring the polytetrafluoroethylene beaker into a 35 ℃ water bath kettle, and magnetically stirring for 24h to remove the Al layer by etching;
(3) diluting the above reaction product with deionized water, centrifuging at 3500rmp for 5min, repeatedly cleaning the obtained precipitate with deionized water until the supernatant is no longer transparent, and turns into dark green, and has pH value>Collecting the bottom precipitate to obtainTo Ti3C2Tx clay;
(4) to Ti3C2Adding 200mL of deionized water into Tx clay, performing water bath ultrasound for 20min, centrifuging the dispersion liquid after ultrasound for 20min at the rotating speed of 3500rmp, and obtaining upper-layer dark green liquid, namely few-layer Ti3C2Tx dispersion, which was collected and stored sealed in a refrigerator at 4 ℃.
Compared with the technical problem that MXene early warning type coating material in the prior art does not have independency in resistance and temperature, MXene also has conductive capability at normal temperature and low temperature, and MXene cannot respond to the fire scene temperature, the nano-cellulose interpenetrating Mxene prepared by the method can block the conductive capability of MXene at normal temperature and low temperature. And solves the problems of easy stacking, easy oxidation and difficult storage of MXene at normal temperature.
Example 2
The composite material of the present example with the nanocellulose intercalated Mxene is basically the same as in example 1, except that the nanocellulose colloid in step (1) and the Mxene solution in step (2) are weighed according to the solid content ratio of 5: 1.
Example 3
The composite material of the present example with the nanocellulose intercalated Mxene is basically the same as in example 1, except that the nanocellulose colloid in step (1) and the Mxene solution in step (2) are weighed according to the solid content ratio of 1: 1.
Example 4
The application of the nanocellulose-interpenetrating Mxene composite material of the embodiment to the use of the nanocellulose-interpenetrating Mxene composite material of the embodiment 1 includes the following steps:
(1) sanding and cleaning the wood, drying at 50-60 ℃, and removing the extract to obtain a clean surface;
(2) dipping the wood prepared in the step (1) in a solution containing a bidirectional cross-linking substance for 8-24 hours to ensure that the solid coating amount of the bidirectional cross-linking substance is 2.5-7.5 g/m2And the thickness is 1.5-2.2 mu m, so as to obtain the wood containing the two-way cross-linked layer.
The bidirectional crosslinking substance is selected from one or more of polydopamine, polyethyleneimine, chitosan or amino glycidyl ether.
(3) Dipping the wood containing the two-way cross-linked layer prepared in the step (2) in a phosphorus-containing and nitrogen-containing polyelectrolyte solution for 5min, wherein the phosphorus-containing and nitrogen-containing polyelectrolyte solution is composed of one or more of ammonium polyphosphate, sodium polyphosphate and phosphorylated chitin, drying at 50-60 ℃ for 10-30 min, repeating dipping and drying for 8-12 times to ensure that the coating amount of the solid containing the phosphorus-containing and nitrogen-containing polyelectrolyte is 81.12-121.68 g/m2And obtaining the wood with the flame-retardant layer.
(4) Coating the wood containing the flame-retardant layer prepared in the step (3) with the nano-cellulose/MXene mixed solution prepared in the example 1, drying at 50-60 ℃ for 45-60 min, and repeating coating and drying for 6 times to ensure that the solid coating amount of the nano-cellulose/MXene is 19.2g/m2And obtaining the intelligent wood with fire identification and flame retardant functions.
The intelligent wood with the functions of fire identification and flame retardance comprises the following components:
(1) wood;
(2) the bidirectional cross-linking layer is composed of one or more of polydopamine, polyethyleneimine, chitosan and amino glycidyl ether, and the thickness of the bidirectional cross-linking layer is 1.5-2.2 mu m;
(3) the flame-retardant layer consists of one or more of ammonium polyphosphate, sodium polyphosphate and phosphorylated chitin, and the thickness of the flame-retardant layer is 3-5 micrometers;
(4) the early warning layer is made of a nano cellulose/MXene composite material and has the thickness of 6-8 mu m;
(5) the protective layer consists of a hydrophobic coating and has a thickness of 0.5-1 μm.
In the embodiment, the nano-cellulose is inserted into the MXene molecular layer gap, so that the problems that the MXene is easy to stack, easy to oxidize and difficult to store at normal temperature are solved, and the nano-cellulose does not have the conductive capability, so that the conductive capability of the MXene at normal temperature and low temperature (200 ℃) can be blocked. When a fire disaster happens, because the temperature rises rapidly, the nano cellulose is pyrolyzed and carbonized rapidly, the conductive network is connected, and an early warning signal is sent out in time. The performance test shows that: the intelligent wood with fire identification and flame-retardant functions has the advantages that when the intelligent wood contacts a fire source, the time for triggering the early warning signal is only 2.2s, and ultra-sensitive early warning is realized.
Flame retardant property: the molecular network system formed by CNC/MXene, ammonium polyphosphate and PDA generates flame retardant synergistic effect through barrier effect and catalytic effect. The performance test shows that: the wood assembled by PDA, APP and CNC/MXene has the limiting oxygen index of 47.4 percent, UL-94 reaching V-0 level and the heat release rate of 54.70kW/m2The smoke release amount is 119.9m2/m2。
Adhesion performance: the bi-directional cross-linking substance is introduced to the surface of the wood, so that the problem of adhesion between the wood and the flame-retardant early warning coating is solved, and the flame-retardant early warning coating has excellent mechanical properties. The performance test shows that the adhesion force of the flame-retardant early warning coating adhered by the polydopamine reaches the first level, and the hardness reaches 6H.
Example 5
The application of the composite material of this example with the Mxene interpenetrated nanocellulose is basically the same as example 4, except that the drying in the step (4) is performed for 2 times, so that the solid coating amount of the nanocellulose/MXene is 6.4g/m2。
Example 6
The application of the composite material of this example with the Mxene interpenetrated nanocellulose is basically the same as example 4, except that the drying in the step (4) is performed for 10 times, so that the solid coating amount of the nanocellulose/MXene is 32g/m2。
Example 7
The application of the composite material of this example with the Mxene intercalated with the nano-cellulose is basically the same as that of example 4, except that the drying in the step (4) is carried out 4 times to ensure that the solid coating amount of the nano-cellulose/MXene is 12.8g/m2。
Example 8
The composite material of this example, which is a nanocellulose-interpenetrating Mxene composite material, is substantially the same as example 4, except that,
in the step (2), the amount of the solid coating of the bidirectionally crosslinkable substance is set to 2.5g/m2So as to obtain the wood containing the two-way cross-linked layer.
Drying for 8 times in the step (3) to ensure that the solid coating amount of the phosphorus-containing and nitrogen-containing polyelectrolyte is 81.12g/m2And obtaining the wood with the flame-retardant layer.
Example 9
The composite material of this example, which is a nanocellulose-interpenetrating Mxene composite material, is substantially the same as example 4, except that,
in the step (2), the amount of the solid coating of the bidirectionally crosslinkable substance was made 7.5g/m2And obtaining the wood containing the two-way crosslinking layer.
Drying for 12 times in the step (3) to ensure that the solid coating amount of the phosphorus-containing and nitrogen-containing polyelectrolyte is 121.68g/m2And obtaining the wood with the flame-retardant layer.
Example 10
A nanocellulose-interpenetrating Mxene composite of this example was substantially the same as example 4, except that the nanocellulose-interpenetrating Mxene composite of example 2 was used.
Example 11
A nanocellulose-interpenetrating Mxene composite of this example was substantially the same as example 4, except that the nanocellulose-interpenetrating Mxene composite of example 3 was used.
Comparative example 1
The comparative example was pure wood.
Comparative example 2
This comparative example is essentially the same as example 4, except that it contains only the flame retardant coating and no warning layer.
When only PDA and ammonium polyphosphate are assembled on the surface of the wood (with the same addition amount), the limiting oxygen index is 42.6 percent, and the heat release rate is 58.31kW/m2The smoke release amount is 127.72m2/m2。
Comparative example 3
This comparative example is essentially the same as example 4 except that the MXene material prepared in example 1 was used for the pre-warning layer.
TABLE 1 comparison of early warning fire retardant wood made in examples and comparative examples
From the examples and comparative examples it can be seen that: pure wood does not have flame retardant capability and fire early warning capability. When the surface of the wood is coated with the two-way cross-linking substance and the flame retardant, the wood has excellent flame retardant property but still has no fire early warning property. Only when the surface of the wood is coated with the bidirectional cross-linking substance, the flame retardant and the nano-cellulose interpenetrated MXene composite material, the wood can have excellent flame retardant performance and fire recognition capability. This is because pure MXene is a conductor at normal temperature, and its resistance does not have the ability to decrease with temperature, and the fire early warning function cannot be realized (comparative example 3). When the Mxene is interpenetrated by the nano-cellulose, the nano-cellulose is interpenetrated in the MXene molecular network at normal temperature, and the MXene can be blocked from forming a conductive path at normal temperature and low temperature; when a fire disaster happens, the temperature rises rapidly, the nano-cellulose is pyrolyzed and carbonized rapidly, the conductive network is connected, an early warning signal is sent out in time, and the fire disaster early warning triggering time can be regulated and controlled by regulating the content of the nano-cellulose and the coating amount of the nano-cellulose/MXene.
Claims (10)
1. A nano-cellulose interpenetration Mxene composite material is characterized in that: the composite material comprises nanocellulose and Mxene; the weight ratio of the nano-cellulose to the Mxene is 5: 1-1: 1; the mass fraction of the nano-cellulose and the Mxene is 0.8-1.5%.
2. A preparation method of a nano-cellulose interpenetrated Mxene composite material is characterized by comprising the following steps: the method comprises the following steps:
comprises the following steps of preparing nano cellulose colloid: dispersing nano-cellulose in a solvent to obtain a nano-cellulose colloid with the mass fraction of 1-5%, and adjusting the pH value to 7-7.5;
comprises the steps of preparing MXene solution: dispersing MXene solvent to obtain MXene solution with the mass fraction of 4-6.5 mg/mL;
and mixing and dispersing the nano cellulose colloid and the MXene solution according to the solid content weight ratio of 5: 1-1: 1 to obtain the nano cellulose interpenetration Mxene composite material with the mass fraction of 0.8-1.5%.
3. The method for preparing a nanocellulose-interpenetrating Mxene composite material according to claim 2, wherein: the Mxene is Ti3C2Tx MXene。
4. The application of the nano-cellulose interpenetrated Mxene composite material in the preparation of fire early warning wood is characterized in that: interpenetration of Mxene composite with nanocellulose according to any of the claims 1-3.
5. The application of the nano-cellulose interpenetration Mxene composite material in the preparation of fire early warning wood according to claim 4, which is characterized in that: coating the Mxene composite material with the nano-cellulose on the surface of wood, wherein the coating amount of the Mxene composite material with the nano-cellulose is 6.4-32 g/m2And obtaining the wood with the early warning layer.
6. The application of the nano-cellulose interpenetrated Mxene composite material in the preparation of fire early warning wood according to claim 4, which is characterized in that: and coating the nano-cellulose interpenetration Mxene composite material on the surface of the wood, and repeatedly brushing and drying for 2-10 times to obtain the wood with the early warning layer.
7. The application of the nanocellulose-interpenetrating Mxene composite material in the preparation of fire early warning wood according to any one of claims 5 or 6, wherein the nanocellulose-interpenetrating Mxene composite material comprises: and a bidirectional cross-linking layer close to the wood and a flame-retardant layer close to the early warning layer are also arranged between the wood and the early warning layer.
8. The application of the nano-cellulose interpenetration Mxene composite material in the preparation of fire early warning wood according to claim 7, which is characterized in that: the bidirectional cross-linking layer is selected from one or more of polydopamine, polyethyleneimine, chitosan or amino glycidyl ether; the coating amount of the two-way cross-linked layer is 2.5-7.5 g/m2。
9. The application of the nano-cellulose interpenetrated Mxene composite material in the preparation of fire early warning wood according to claim 7, which is characterized in that: the flame-retardant layer is prepared from a phosphorus-containing and nitrogen-containing polyelectrolyte solution; the phosphorus-containing and nitrogen-containing polyelectrolyte solution comprises one or more of ammonium polyphosphate, sodium polyphosphate or phosphorylated chitin; the coating amount of the flame-retardant layer is 81.12-121.68 g/m2。
10. The application of the nano-cellulose interpenetrated Mxene composite material in the preparation of fire early warning wood according to claim 7, which is characterized in that: the water repellent protective layer is coated on the surface of the early warning layer.
Priority Applications (1)
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| CN116478615B (en) * | 2023-03-16 | 2023-10-20 | 杭州师范大学 | Transparent flame-retardant early-warning water-based paint and preparation method and application thereof |
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