CN114908561B - Copper nanowire composite gauze, preparation method thereof and anti-haze screen window - Google Patents
Copper nanowire composite gauze, preparation method thereof and anti-haze screen window Download PDFInfo
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Abstract
The invention provides a copper nanoThe preparation method of the rice noodle composite gauze comprises the following steps: s1) dispersing copper nanowires in an alcohol solvent to obtain copper nanowire dispersion liquid; s2) after heating the gauze substrate, spraying copper nanowire dispersion liquid on the surface to obtain the gauze substrate compounded with the conductive copper nanowires; s3) carrying out dipping treatment on the gauze substrate compounded with the conductive copper nanowires in a solution containing a reducing agent to obtain the copper nanowire composite gauze. Compared with the prior art, the method has the advantages that the copper nanowires are uniformly loaded on the gauze substrate through spraying, then the chemical welding is realized through the reducing agent, the copper nanowires are welded to form a conductive network, so that the copper nanowire composite gauze with higher conductivity is obtained, and PM can be adsorbed through coulomb force 2.5 The method realizes the balance of the filtering performance and the air permeability, can realize air purification in the air circulation state, and has the advantages of simplicity, low pollution, economy, low cost and wide application prospect.
Description
Technical Field
The invention belongs to the technical field of nano materials, and particularly relates to a copper nanowire composite gauze, a preparation method thereof and an anti-haze screen window.
Background
With the improvement of the development level of China, the haze problem in the air is increasingly attracting attention, and the haze problem becomes one of important factors affecting human health. Haze is mainly composed of three items, namely sulfur dioxide, nitrogen oxides and inhalable particulate matters. Wherein the inhalable particles are particles having an aerodynamic equivalent diameter of 10 μm or less, also called PM 10 The method has long lasting time in the ambient air and has great influence on human health and atmospheric visibility. And fine particulate matter PM having a diameter of 2.5 μm or less 2.5 Compared with PM 10 The particle size is smaller, and toxic and harmful substances (such as heavy metals, microorganisms and the like) are easy to attach, so that the influence on the health of human bodies and the quality of the atmospheric environment is larger. Research has shown that high concentrations of haze particles in human air inhaled over a long period of time can cause a number of health problems, such as PM in haze 2.5 Can pass through the protective barrier of respiratory tract, reach bronchus and alveolus, and further pass through lung to transfer, interfere with other organs, cause vascular and pulmonary inflammation, etcDisease. Therefore, in addition to fundamentally treating the problem of haze particle pollution, indoor air quality problems are also concerned.
Currently, commercial PM 2.5 Haze particle purifying equipment mainly is air purifier, and its effective filter layer is mostly HEPA filter screen, active carbon layer etc.. Wherein, the HEPA filter screen intercepts PM through thick physical barrier 2.5 However, the high-power air pump is needed to balance the pressure drop to assist air circulation, so that the energy consumption is increased and the noise problem is generated. The activated carbon has good adsorption effect, but the adsorbed pollutants are easy to release back to the air in a high-temperature and high-humidity environment, so that secondary pollution is caused.
The high-end air purifier in the market adopts more various filtering technologies, such as anion technology, to solve the problems, but the selling price is relatively high, and the high-end air purifier is not suitable for popularization and use. In addition, the air purifier needs to purify air in a closed room, and has poor purification capability and high energy consumption in an air circulation state.
In view of this, a series of filter PM has been developed in recent years 2.5 The filter membrane with the capacity is used as an anti-haze screen window material, so that air can be purified in an air circulation state, and the energy consumption is reduced.
The journal of the American society of chemistry, nano materials (ACS Nano materials, trans parent, and Multifunctional Air Filters Using Self-Assembled 2D Nanoarchitectured Fibrous Networks,2019 years, volume 13, pages 13501-13512) describes the preparation of unique nanofiber structured filtration membranes with spider web-like structures by electrospinning. Due to the size effect of the 2D nano grid structure, the filter membrane has the advantages of high transparency, low thickness, light weight, high filtration efficiency, low pressure drop and the like, but the whole preparation process has larger energy consumption.
Germany advanced functional Material (Advanced Functional Materials: electrically Activated Ultrathin PVDF-TrFE Air Filter for High-Efficiency PM) 1.0 Filtration,2019, 29, pages 1903633.1-1903633.7) introduces electrostatic force by electrostatic electret and triboelectric charging, further improving the adsorption capacity of the filter membrane. But under the influence of environmental factors, static electricityThe charge may dissipate causing degradation of the filtering properties of the material.
U.S. Cross science (iScience: mass Production of Nanowire-Nylon Flexible Transparent Smart Windows for PM) 2.5 Capture, volume 12, 2019, pages 333-341), describes a filter that can be used to filter PM 2.5 The silver nanowire/nylon gauze material which is electrified with positive electricity adsorbs PM which is electrified with opposite charges in advance by coulomb force 2.5 And (3) particles. The introduction of coulomb force can not only stably enhance the filtering performance of the material by consuming lower electric energy without being affected by the environment, but also can turn on/off the filtering system according to the requirement. Although Ag nanowires have excellent conductivity and stability, they are used as noble metals with high economic cost.
Disclosure of Invention
In view of the above, the present invention aims to provide a conductive material with good conductivity, stability and PM 2.5 Copper nanowire composite gauze with filtering performance, preparation method thereof and anti-haze screen window.
The invention provides a preparation method of a copper nanowire composite gauze, which comprises the following steps:
s1) dispersing copper nanowires in an alcohol solvent to obtain copper nanowire dispersion liquid;
s2) after heating the gauze substrate, spraying copper nanowire dispersion liquid on the surface to obtain the gauze substrate compounded with the conductive copper nanowires;
s3) carrying out dipping treatment on the gauze substrate compounded with the conductive copper nanowires in a solution containing a reducing agent to obtain the copper nanowire composite gauze.
Preferably, after the dipping treatment in the step S3), hydrophobic modification is further performed to obtain the copper nanowire composite gauze.
Preferably, the hydrophobic modification is by immersion modification in a solution containing a hydrophobic surface modifier; the hydrophobic surface modifier is selected from one or more of dodecyl mercaptan, octadecyl mercaptan and poly-p-phenylenediamine; the solvent in the solution containing the hydrophobic surface modifier is selected from alcohol solvents.
Preferably, the concentration of the solution containing the hydrophobic surface modifier is 0.3-1 mol/L; the time of the dipping modification is 5-120 s.
Preferably, a dispersing agent is further added in the step S1); the dispersing agent is one or more selected from polyvinylpyrrolidone, polyethyleneimine and ethylcellulose; the mass of the dispersing agent is 1-5% of the total mass of the dispersing agent and the alcohol solvent.
Preferably, the concentration of the copper nanowires in the copper nanowire dispersion liquid is 0.1-3 mg/mL; the alcohol solvent is ethanol; the mesh number of the gauze substrate is 50-500 meshes.
Preferably, the heating temperature in the step S2) is 50-90 ℃; spraying is carried out by adopting a spray gun; the aperture of the spray gun is 0.3-0.7 mm; the distance between the spray gun and the gauze substrate during spraying is 5-20 cm; the ratio of the copper nano dispersion liquid to the gauze substrate is (5-50) mL:100cm 2 。
Preferably, the reducing agent is selected from one or more of sodium borohydride, potassium borohydride and hydrazine hydrate; the solvent in the solution containing the reducing agent comprises water and an alcohol solvent; the volume ratio of the water to the alcohol solvent is 1: (0.5-2); the concentration of the reducing agent in the solution containing the reducing agent is 0.3-1 mol/L; the time of the dipping treatment is 5-120 s.
The invention also provides the copper nanowire composite gauze prepared by the preparation method.
The invention also provides an anti-haze screen window, which comprises the copper nanowire composite gauze prepared by the preparation method.
The invention provides a preparation method of a copper nanowire composite gauze, which comprises the following steps: s1) dispersing copper nanowires in an alcohol solvent to obtain copper nanowire dispersion liquid; s2) after heating the gauze substrate, spraying copper nanowire dispersion liquid on the surface to obtain the gauze substrate compounded with the conductive copper nanowires; s3) carrying out dipping treatment on the gauze substrate compounded with the conductive copper nanowires in a solution containing a reducing agent to obtain the copper nanowire composite gauze. Compared with the prior art, the invention realizes that the copper nano wires are uniformly loaded on the gauze substrate by spraying and then realized by the reducing agentThe copper nanowire is welded to form a conductive network by chemical welding, so that the copper nanowire composite gauze with higher conductivity is obtained, and PM can be adsorbed by coulomb force 2.5 The method realizes the balance of the filtering performance and the air permeability, can realize air purification in the air circulation state, and has the advantages of simple preparation method, low pollution, economy, low cost and wide application prospect.
Drawings
FIG. 1 is a scanning electron microscope image of the purified copper nanowires of example 1 of the present invention;
FIG. 2 is a scanning electron microscope image of the purified copper nanowires of example 2 of the present invention;
FIG. 3 is a photograph showing copper nanowire/ethanol dispersion solutions prepared in examples 1 and 2 of the present invention;
FIG. 4 is a scanning electron microscope photograph of the gauze substrate and the resultant copper nanowire composite gauze in example 1 of the present invention;
FIG. 5 is a photograph of the copper nanowire composite gauze obtained in example 1 and example 2 of the present invention;
FIG. 6 is a spectrum of the copper nanowire composite gauze obtained in the examples 1 and 2 of the present invention;
FIG. 7 is a PM of the copper nanowire composite gauze obtained in example 1 and example 2 of the present invention 2.5 A test result graph of filtering capability;
FIG. 8 is a PM in an embodiment of the invention 2.5 A schematic diagram of a filtering capability test device;
FIG. 9 PM filtration by copper nanowire composite gauze obtained in example 1 and example 2 of the present invention 2.5 Is a schematic diagram of the principle of (a).
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a preparation method of a copper nanowire composite gauze, which comprises the following steps: s1) dispersing copper nanowires in an alcohol solvent to obtain copper nanowire dispersion liquid; s2) after heating the gauze substrate, spraying copper nanowire dispersion liquid on the surface to obtain the gauze substrate compounded with the conductive copper nanowires; s3) carrying out dipping treatment on the gauze substrate compounded with the conductive copper nanowires in a solution containing a reducing agent to obtain the copper nanowire composite gauze.
The source of all the raw materials is not particularly limited, and the raw materials are commercially available.
In the invention, the copper nanowire is preferably obtained by treating copper nanowire mother liquor with a purifying agent; the copper nanowire mother liquor is preferably prepared according to the synthesis method reported In the literature In Situ Seed-Mediated High-Yield Synthesis of Copper Nanowires on Large Scale (Langmuir, 2019, volume 35, pages 4364-4369); in the embodiment provided by the invention, the copper nanowire mother solution is prepared by the following method: mixing a copper source, a carbon source and organic amine in water, heating to 40-60 ℃ and stirring to obtain a uniform reaction solution, heating to 70-80 ℃ and heating for 15-30 h to generate copper nano particles, and continuously heating to 100-120 ℃ and reacting for 15-30 h under the stirring condition to obtain copper nano wire mother liquor; the copper source is preferably copper chloride; the carbon source is preferably glucose; the organic amine is preferably hexadecylamine; the purifying agent is preferably a mixed solution of water and chloroform or a mixed solution of normal hexane and ethanol; the volume ratio of water to chloroform in the mixed solution of water and chloroform is preferably 1: (0.5 to 2), more preferably 1: (0.8 to 1.5), and more preferably 1: (0.8 to 1.2), most preferably 1:1, a step of; the volume ratio of the normal hexane to the ethanol in the mixed solution of the normal hexane and the ethanol is preferably 1: (2 to 5), more preferably 1: (2 to 4), and more preferably 1: (2.5 to 3.5), most preferably 1:3, a step of; the method of treatment is preferably specifically as follows: centrifuging copper nanowire mother liquor, taking sediment and purifying agent to be uniformly mixed, standing for separating liquid, and taking lower solution for centrifuging to obtain copper nanowires; the centrifugal speed of the copper nanowire mother solution is preferably 8000-15000 rpm, more preferably 8000-12000 rpm, and still more preferably 10000rpm; the rate of centrifugation of the lower layer solution is preferably 5000 to 10000rpm, more preferably 6000 to 9000rpm, and still more preferably 8000rpm.
Dispersing copper nanowires in an alcohol solvent to obtain copper nanowire dispersion; the alcohol solvent is preferably ethanol; in order to improve the dispersibility of the copper nanowires, a dispersing agent is preferably added; the dispersing agent is preferably one or more of polyvinylpyrrolidone, polyethyleneimine and ethylcellulose, more preferably polyvinylpyrrolidone; the mass of the dispersing agent is 1-5% of the total mass of the dispersing agent and the alcohol solvent, more preferably 2-4%, still more preferably 2.5-3%; the concentration of copper nanowires in the copper nanowire dispersion is preferably 0.1 to 3mg/mL, more preferably 0.5 to 2mg/mL, still more preferably 0.5 to 1mg/mL.
After heating the gauze substrate, spraying copper nanowire dispersion liquid on the surface to obtain the gauze substrate compounded with the conductive copper nanowires; the mesh number of the gauze substrate is preferably 50-500 mesh; the mesh substrate is preferably a nylon mesh; the heating temperature is preferably 50-90 ℃, more preferably 50-80 ℃, and still more preferably 60-70 ℃; in the invention, spraying is preferably performed by using a spray gun; the aperture of the spray gun is preferably 0.3-0.7 mm, more preferably 0.4-0.6 mm, and still more preferably 0.5mm; the distance between the spray gun and the gauze substrate during spraying is preferably 5-20 cm, more preferably 8-15 cm, even more preferably 8-12 cm, and most preferably 10cm; the ratio of the copper nano-dispersion to the gauze substrate is preferably (5-50) mL:100cm 2 More preferably (10 to 50) mL:100cm 2 Still more preferably (20 to 50) mL:100cm 2 Still more preferably (30 to 50) mL:100cm 2 Most preferably 40mL:100cm 2 。
Dipping the gauze substrate compounded with the conductive copper nanowires in a solution containing a reducing agent; the reducing agent is preferably one or more of sodium borohydride, potassium borohydride and hydrazine hydrate, more preferably sodium borohydride; the solvent in the solution containing the reducing agent preferably includes water and an alcohol solvent; the volume ratio of water to alcohol solvent is preferably 1: (0.5-2). More preferably 1: (0.8 to 1.5), more preferably1: (0.8 to 1.2), most preferably 1:1, a step of; the concentration of the reducing agent in the reducing agent-containing solution is preferably 0.3 to 1mol/L, more preferably 0.3 to 0.8mol/L, still more preferably 0.4 to 0.5mol/L, and most preferably 0.5mol/L; the time of the dipping treatment is preferably 5 to 120 seconds, more preferably 10 to 100 seconds, still more preferably 20 to 80 seconds, and most preferably 30 to 50 seconds; dispersants such as PVP (polyvinylpyrrolidone)
) The ligand is chemically combined with the Cu surface due to rich carbonyl groups, so that contact of a Cu-Cu interface is hindered, the conductivity is influenced, after the reducing agent sodium borohydride is subjected to a reduction treatment process, the dispersing agent PVP is reduced and removed, a direct contact Cu-Cu interface is obtained, cuNWs is effectively subjected to chemical welding, an electron transmission path is formed, and the conductivity is enhanced. After the impregnation treatment, it is preferably air-dried, more preferably with nitrogen.
In order to improve the stability of the copper nanowire composite gauze, hydrophobic modification is preferably carried out; in the present invention, modification is carried out by immersing in a solution of a hydrophobic surface modifier; the hydrophobic surface modifier is preferably one or more of dodecyl mercaptan, octadecyl mercaptan and poly (p-phenylene diamine), more preferably dodecyl mercaptan; the solvent in the solution containing the hydrophobic surface modifier is preferably an alcoholic solvent, more preferably ethanol; the concentration of the solution containing the hydrophobic surface modifier is preferably 0.3 to 1mol/L, more preferably 0.3 to 0.8mol/L, still more preferably 0.4 to 0.5mol/L, and most preferably 0.5mol/L; the time for the impregnation modification is 5 to 120s, more preferably 10 to 100s, still more preferably 20 to 80s, and most preferably 30 to 50s; the stability of the copper nanowire composite gauze can be improved through hydrophobic modification, so that the copper nanowire composite gauze has high conductivity and high stability; after the dipping modification, air drying is preferred, and more preferred nitrogen gas is used for drying, so that the copper nanowire composite gauze is obtained.
According to the invention, copper nanowires are uniformly loaded on a gauze substrate through spraying, then chemical welding is realized through a reducing agent, and the copper nanowires are welded to form a conductive network, so that the copper nanowire composite gauze with higher conductivity is obtained, and PM can be adsorbed through coulomb force 2.5 Realize the filtering performance and the permeabilityThe air purification can be realized in an air circulation state, and the preparation method is simple, low in pollution, economical and low in cost, and has a wide application prospect.
The invention also provides the copper nanowire composite gauze prepared by the method.
The invention also provides an anti-haze screen window, which comprises the copper nanowire composite gauze prepared by the preparation method.
In order to further illustrate the invention, the following describes the copper nanowire composite gauze, the preparation method thereof and the anti-haze screen window in detail by combining the embodiments.
The reagents used in the examples below are all commercially available.
Example 1
Copper nanowires were prepared according to the synthetic method reported in the literature (Langmuir, 2019, volume 35, pages 4364-4369): 85.5g of copper chloride dihydrate (CuCl) 2 ·2H 2 O), 99g glucose and 540 g Hexadecylamine (HDA) were dispersed in 40L deionized water. The mixture was heated to 50 ℃ and stirred for 8 hours to form a sky blue homogeneous reaction solution. And then heated to 70 c for 24 hours to produce copper nanoparticles. Finally, the reaction solution was heated at 100℃for 24 hours with stirring at 100rpm, to prepare a copper nanowire mother liquor.
Centrifuging the obtained copper nanowire mother liquor at 10000rpm, dissolving the sediment in a water/chloroform (1:1 v:v) two-phase mixed solvent, vibrating uniformly, standing and separating the solution, centrifuging the lower layer solution at 8000rpm, and obtaining the sediment which is the pure copper nanowire.
20mg of copper nanowires were dissolved in 40mL of a 2.5wt% PVP/ethanol solution to prepare a solution having a concentration of 0.5mg mL -1 Copper nanowire dispersion of (a).
The distance between the nozzle of the spray gun and the gauze substrate was controlled to be 10cm by using a spray gun of 0.5mm, and 20mL (concentration of 0.5mg mL -1 ) Uniformly sprayed on both sides of a 10cm x 10cm gauze substrate (commercially available 200 mesh Long Wangsha) heated at 60 ℃ (40 ml:100cm ratio of copper nanowire dispersion to gauze substrate) 2 )。
After the spray coating was completed, the gauze substrate was immersed in 0.5M sodium borohydride (NaBH 4 ) The copper nanowire composite gauze with high stability is obtained after the copper nanowire composite gauze is soaked in a 0.5M dodecyl mercaptan/ethanol solution for 30s after the copper nanowire composite gauze is dried by nitrogen after the copper nanowire composite gauze is soaked in the water/ethanol (1:1 v:v) solution for 30 s.
The copper nanowire purified in example 1 was analyzed by a scanning electron microscope to obtain a scanning electron microscope photograph thereof, and as shown in fig. 1, the upper layer was copper nanoparticles and the lower layer was copper nanowires.
Fig. 3 (a) is a photograph of a well-dispersed copper nanowire/ethanol solution formulated.
The gauze substrate and the obtained copper nanowire composite gauze in example 1 were analyzed by a scanning electron microscope to obtain a scanning electron microscope photograph thereof, as shown in fig. 4.
Fig. 5 (a) is a photograph of a copper nanowire composite gauze obtained in example 1.
The copper nanowire composite gauze obtained in example 1 was characterized to obtain a spectrum chart (transmittance chart in a region of 400 to 800nm wavelength) thereof, as shown in fig. 6. The characterization results of the spectrum and the sheet resistance test of FIG. 6 show that the transmittance of the copper nanowire/gauze at the wavelength of 550nm is about 70.1%, and the sheet resistance is 50 omega sq -1 About, the resistance is not obviously increased after the material is placed in the air for 30 days at normal temperature.
PM (particulate matter) on copper nanowire composite gauze 2.5 Filtration capability test. The test results are shown in fig. 7, which shows that the copper nanowire/gauze anti-haze screen with a transmittance of 54.1% for PM 2.5 The removal efficiency of (2) is 99.2%, the pressure drop is 6Pa, and the quality factor is 0.8047Pa -1 . Confirm that it is against PM 2.5 Has better filtering capability.
Scanning electron microscope image: obtained by Zeiss GeminiSEM 450 scanning electron microscope shooting, and the accelerating voltage is 5kV.
Spectral diagram: the 400-800 nm wavelength transmittance was measured by a UV2501PC/2550 UV visible spectrometer from Shimadzu corporation.
And (3) sheet resistance test: measured by a Suzhou lattice M-3 hand-held four-probe resistivity tester.
PM 2.5 Filtration capability test: PM (particulate matter) 2.5 The particles are obtained by burning sandalwood, generating negative ions by a negative ion generator module, detecting PM by a CEM DT-9681 air quality detector 2.5 Concentration change, pressure drop was measured by a smart GM510 digital pressure gauge. A schematic of the test apparatus is shown in fig. 8. The specific experimental operation is as follows: ignition of sandalwood to generate substantial amounts of PM 2.5 Particles diffuse to the left side testing cavity along with the airflow, a negative ion generator is started, +5V direct current voltage is applied to the sample, and the right side cavity PM is tested 2.5 Particle concentration variation and pressure drop.
The filtration principle of the copper nanowire composite gauze in this embodiment is shown in fig. 8.
Example 2
Copper nanowires were prepared according to the synthetic method reported in the literature (Langmuir, 2019, volume 35, pages 4364-4369). The obtained copper nanowire mother liquor was centrifuged at 10000rpm, and the sediment was dissolved in a mixed solvent of n-hexane/ethanol (1:3 v: v). And centrifuging at 5000rpm, taking the sediment, repeating for three times to remove the organic ligand attached to the copper nanowire and separate copper nanoparticles, and finally obtaining the sediment which is the purified copper nanowire.
20mg of copper nanowire was dissolved in 40mL of ethanol solution to prepare a concentration of 0.5mg mL -1 Copper nanowire dispersion of (a).
With a 0.5mm spray gun, the distance between the nozzle of the spray gun and the gauze substrate was controlled to be 10cm, and 20mL (concentration of 0.5mg mL -1 ) Uniformly spraying the copper nanowire dispersion liquid on two sides of a 10cm x 10cm gauze substrate heated at 60 ℃ respectively (the ratio of the copper nanowire dispersion liquid to the gauze substrate is 40mL:100cm 2 ) Obtaining the copper nanowire composite gauze.
The copper nanowire purified in example 2 was analyzed by a scanning electron microscope to obtain a scanning electron microscope photograph thereof, and as shown in fig. 2, it was found that a small amount of copper nanoparticles still exist. FIG. 3 (b) is a copper nanowire/ethanol dispersion solution prepared in example 2, in which copper nanowires are poorly dispersed and delaminated due to no dispersant treatment.
Fig. 5 (b) is a photograph of a composite mesh of copper nanowires obtained in example 2, wherein the copper nanowires were unevenly distributed on the nylon mesh.
The copper nanowire composite gauze obtained in example 2 was characterized to obtain a spectrum chart (transmittance chart in a region of 400 to 800nm wavelength) thereof, as shown in fig. 6. The characterization results of the spectrum and sheet resistance test of FIG. 6 show that the transmittance of the copper nanowire composite gauze at the wavelength of 550nm is about 53.0%, and the sheet resistance is 500 Ω sq -1 Left and right.
PM (particulate matter) on copper nanowire composite gauze 2.5 Filtration capability test. The test results are shown in FIG. 7, which shows the copper nanowire composite mesh of example 2 for PM 2.5 The removal efficiency of the filter is 21.5%, and the requirement of haze prevention cannot be met.
Compared with the prior art, the dispersing method of the embodiment can not completely separate the copper nano wires from the copper nano particles, and the purified copper nano wires are still doped with a small amount of copper nano particles; copper nanowires treated without dispersant have poor dispersibility, are difficult to form stable alcohol solution, cannot be uniformly attached to nylon gauze by spraying, and cause poor conductivity and uneven sheet resistance of about 500-2000 omega sq -1 . And the glass is oxidized after being placed in the air for 1 day at normal temperature because of no stabilizer treatment, and the resistance is increased to megaohm level, so that the glass cannot be applied to an anti-haze screen window.
Claims (9)
1. The preparation method of the copper nanowire composite gauze is characterized by comprising the following steps of:
s1) dispersing copper nanowires in an alcohol solvent to obtain copper nanowire dispersion liquid;
s2) after heating the gauze substrate, spraying copper nanowire dispersion liquid on the surface to obtain the gauze substrate compounded with the conductive copper nanowires;
s3) carrying out dipping treatment on the gauze substrate compounded with the conductive copper nanowires in a solution containing a reducing agent to obtain copper nanowire compound gauze;
a dispersing agent is also added in the step S1); the dispersing agent is one or more selected from polyvinylpyrrolidone, polyethyleneimine and ethylcellulose; the mass of the dispersing agent is 1% -5% of the total mass of the dispersing agent and the alcohol solvent;
the concentration of the copper nanowire in the copper nanowire dispersion liquid is 0.1-3 mg/mL.
2. The method according to claim 1, wherein the step S3) is further performed with hydrophobic modification after the impregnation treatment to obtain the copper nanowire composite gauze.
3. The method of preparation according to claim 2, wherein the hydrophobic modification is by immersion modification in a solution containing a hydrophobic surface modifier; the hydrophobic surface modifier is selected from one or more of dodecyl mercaptan, octadecyl mercaptan and poly-p-phenylenediamine; the solvent in the solution containing the hydrophobic surface modifier is selected from alcohol solvents.
4. The method according to claim 3, wherein the concentration of the solution containing the hydrophobic surface modifier is 0.3 to 1mol/L; the time of the dipping modification is 5-120 s.
5. The method of claim 1, wherein the alcohol solvent is ethanol; the mesh number of the gauze substrate is 50-500 meshes.
6. The method according to claim 1, wherein the heating temperature in step S2) is 50 ℃ to 90 ℃; spraying is carried out by adopting a spray gun; the aperture of the spray gun is 0.3-0.7 mm; the distance between the spray gun and the gauze substrate is 5-20 cm during spraying; the ratio of the copper nano dispersion liquid to the gauze substrate is (5-50) mL:100cm 2 。
7. The method of claim 1, wherein the reducing agent is selected from one or more of sodium borohydride, potassium borohydride, and hydrazine hydrate; the solvent in the solution containing the reducing agent comprises water and an alcohol solvent; the volume ratio of the water to the alcohol solvent is 1: (0.5-2); the concentration of the reducing agent in the solution containing the reducing agent is 0.3-1 mol/L; the time of the dipping treatment is 5-120 s.
8. A copper nanowire composite gauze produced by the production method of any one of claims 1 to 7.
9. An anti-haze screen window, which is characterized by comprising the copper nanowire composite gauze prepared by the preparation method of any one of claims 1 to 7.
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