CN115819996B - Functionalized molybdenum disulfide, preparation method thereof, photo-thermal coating and application thereof - Google Patents
Functionalized molybdenum disulfide, preparation method thereof, photo-thermal coating and application thereof Download PDFInfo
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- 229910052982 molybdenum disulfide Inorganic materials 0.000 title claims abstract description 141
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 238000000576 coating method Methods 0.000 title claims abstract description 64
- 239000011248 coating agent Substances 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 239000002135 nanosheet Substances 0.000 claims abstract description 23
- 125000003396 thiol group Chemical group [H]S* 0.000 claims abstract description 13
- PJUIMOJAAPLTRJ-UHFFFAOYSA-N monothioglycerol Chemical compound OCC(O)CS PJUIMOJAAPLTRJ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000005416 organic matter Substances 0.000 claims abstract description 6
- 229940035024 thioglycerol Drugs 0.000 claims abstract description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 229920002635 polyurethane Polymers 0.000 claims description 27
- 239000004814 polyurethane Substances 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 19
- 239000000839 emulsion Substances 0.000 claims description 17
- 239000011230 binding agent Substances 0.000 claims description 15
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 15
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 15
- 239000002562 thickening agent Substances 0.000 claims description 15
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 13
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 13
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 13
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 13
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 13
- 239000002270 dispersing agent Substances 0.000 claims description 13
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 239000004094 surface-active agent Substances 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 9
- 238000009210 therapy by ultrasound Methods 0.000 claims description 9
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 abstract description 14
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 13
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 abstract description 12
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 abstract description 11
- 125000000524 functional group Chemical group 0.000 abstract description 10
- 238000010612 desalination reaction Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 8
- 239000008367 deionised water Substances 0.000 description 8
- 229910021641 deionized water Inorganic materials 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 7
- 239000012267 brine Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 229910052961 molybdenite Inorganic materials 0.000 description 7
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 5
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- UFULAYFCSOUIOV-UHFFFAOYSA-N cysteamine Chemical compound NCCS UFULAYFCSOUIOV-UHFFFAOYSA-N 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 229960003151 mercaptamine Drugs 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000002207 thermal evaporation Methods 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/142—Solar thermal; Photovoltaics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
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- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a functionalized molybdenum disulfide, a preparation method thereof, a photo-thermal coating and application thereof. The preparation method of the functionalized molybdenum disulfide comprises the following steps: reacting the molybdenum disulfide nanosheets with organic matters containing sulfhydryl groups to obtain functional molybdenum disulfide; wherein the organic matter containing sulfhydryl group comprises at least one of thioglycollic acid, thioglycerol and thioethylamine. According to the preparation method of the functional molybdenum disulfide, three functional groups of carboxyl, hydroxyl and amino are introduced to the surface of the molybdenum disulfide through functional group modification, and then the functional groups are compounded with organic matters to prepare the coating, so that the photo-thermal application of the molybdenum disulfide is realized in a low-cost and large-scale manner; the functionalized molybdenum disulfide is easy to operate, so that the combination of the molybdenum disulfide and organic matters is realized, and a foundation is laid for subsequent coating; the molybdenum disulfide is functionalized and combined with organic matters to prepare the coating for photo-thermal desalination, so that low-cost, green and efficient photo-thermal application of the molybdenum disulfide is realized.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a functionalized molybdenum disulfide, a preparation method thereof, a photo-thermal coating and application thereof.
Background
Fresh water resource shortage is one of the most challenging problems in the 21 st century, 96.5% of the water resources on the earth's surface are seawater, and thus seawater desalination is an ideal solution. Solar energy is a renewable clean energy source, and the generation of fresh water by converting solar energy into thermal energy to heat liquid water to generate steam is a sustainable method. In recent years, molybdenum disulfide has been used as a potential functional material for solar steam generation due to its abundant earth reserves and stable and excellent chemical properties. Due to the limiting effect of quanta, the bulk MoS 2 is peeled into a single-layer MoS 2 nanometer sheet, the indirect band gap is gradually increased along with the reduction of the layer number, when the layer number is reduced to be a single layer, the indirect band gap is 1.2eV and is converted into the direct band gap which is 1.9eV, the electronic property can be obviously changed, and compared with a bulk material, the near infrared absorbance is obviously increased, and the high-efficiency photo-thermal effect can be shown. However, because molybdenum disulfide lacks corresponding functional groups on the surface, the complexing with organic substances is limited, and therefore, improvement is necessary.
Disclosure of Invention
In view of the above, the invention provides a functionalized molybdenum disulfide, a preparation method thereof, a photo-thermal coating and application thereof, so as to solve or partially solve the technical problems existing in the prior art.
In a first aspect, the invention provides a method for preparing functionalized molybdenum disulfide, comprising the following steps:
reacting the molybdenum disulfide nanosheets with organic matters containing sulfhydryl groups to obtain functional molybdenum disulfide;
Wherein the organic matter containing sulfhydryl group comprises at least one of thioglycollic acid, thioglycerol and thioethylamine.
Preferably, in the preparation method of the functionalized molybdenum disulfide, after mixing the molybdenum disulfide nanosheets, the organic matters containing the mercapto groups and water, carrying out ultrasonic treatment for 1-5 h, then stirring for 20-30 h, and filtering to obtain the functionalized molybdenum disulfide.
Preferably, the preparation method of the functionalized molybdenum disulfide comprises the steps of (0.05-0.2), 0.1-15 and 5-100 of the molybdenum disulfide nanosheets, the organic matters containing sulfhydryl groups and water.
In a second aspect, the invention also provides a functionalized molybdenum disulfide prepared by the preparation method.
In a third aspect, the invention also provides a photo-thermal coating, which comprises the functionalized molybdenum disulfide prepared by the preparation method or the functionalized molybdenum disulfide.
Preferably, the photo-thermal paint further comprises: binder, thickener, dispersant and surfactant.
Preferably, the photo-thermal coating and the binder are aqueous polyurethane emulsion;
And/or the thickener comprises carboxymethyl cellulose and/or hydroxyethyl cellulose;
And/or the dispersant comprises water and isopropanol;
and/or the surfactant is sodium dodecyl benzene sulfonate.
Preferably, the photo-thermal coating comprises (1-5): (5-25): (1-10): (30-120): (0.01-0.05) by mass ratio of the functional molybdenum disulfide, the binder, the thickener, the dispersant and the surfactant.
In a fourth aspect, the invention also provides a preparation method of the photo-thermal coating, which comprises the following steps:
adding the functionalized molybdenum disulfide into the dispersing agent, adding the surfactant, stirring, adding the binder and the thickener, and continuously stirring to obtain the photo-thermal coating.
In a fifth aspect, the invention also provides an application of the photo-thermal coating or the photo-thermal coating prepared by the preparation method as a photo-thermal material.
Compared with the prior art, the preparation method and the photo-thermal coating of the functionalized molybdenum disulfide have the following beneficial effects:
According to the preparation method of the functional molybdenum disulfide, thioglycollic acid, thioglycerol, mercaptoethylamine and a molybdenum disulfide nanosheet are adopted to react, three functional groups including carboxyl, hydroxyl and amino are introduced into the surface of the molybdenum disulfide through functional group modification, and then the functional groups are compounded with organic matters to prepare the coating, so that the photo-thermal application of the molybdenum disulfide is realized in a low-cost and large-scale manner; the functionalized molybdenum disulfide is easy to operate, so that the combination of the molybdenum disulfide and organic matters is realized, and a foundation is laid for subsequent coating; the molybdenum disulfide is functionalized and combined with organic matters to prepare the coating for photo-thermal desalination, so that low-cost, green and efficient photo-thermal application of the molybdenum disulfide is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is an infrared spectrogram of the functionalized molybdenum disulfide prepared in examples 1-3 of the present invention;
FIG. 2 is a physical diagram of an evaporator made of the photo-thermal coating in example 4;
FIG. 3 is a graph showing the quality of brine over time for different evaporators under illumination;
FIG. 4 shows the evaporation rate and the corresponding evaporation efficiency of different evaporators at a light intensity of 1KW m -2;
FIG. 5 shows the surface temperature change of different evaporators after 1KW m -2 is illuminated for 1 h;
FIG. 6 is a functional molybdenum disulfide formula;
FIG. 7 is a reaction of functionalized molybdenum disulfide, aqueous polyurethane, and hydroxymethyl cellulose/hydroxyethyl cellulose.
Detailed Description
The following description of the embodiments of the present invention will be made in detail and with reference to the embodiments of the present invention, but it should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The embodiment of the application provides a preparation method of functionalized molybdenum disulfide, which comprises the following steps:
reacting the molybdenum disulfide nanosheets with organic matters containing sulfhydryl groups to obtain functional molybdenum disulfide;
Wherein the organic matter containing sulfhydryl group comprises at least one of thioglycollic acid, thioglycerol and thioethylamine.
In the embodiment, molybdenum disulfide and thioglycollic acid react to obtain carboxyl functional molybdenum disulfide, molybdenum disulfide and thioglycerol react to obtain hydroxyl functional molybdenum disulfide, and molybdenum disulfide and thioglycollic acid react to obtain amino functional molybdenum disulfide; three functional groups of carboxyl, hydroxyl and amino are introduced on the surface of molybdenum disulfide through functional group modification, and then the molybdenum disulfide is compounded with organic matters to prepare a coating, so that the photo-thermal application of the molybdenum disulfide is realized in a low-cost and large-scale manner; the functionalized molybdenum disulfide is easy to operate, so that the combination of the molybdenum disulfide and organic matters is realized, and a foundation is laid for subsequent coating; the molybdenum disulfide is functionalized and combined with organic matters to prepare the coating for photo-thermal desalination, so that low-cost, green and efficient photo-thermal application of the molybdenum disulfide is realized.
In some embodiments, after mixing molybdenum disulfide nanosheets, mercapto-containing organics and water, performing ultrasonic treatment for 1-5 hours, then stirring for 20-30 hours, and filtering to obtain the functionalized molybdenum disulfide.
In some embodiments, the mass ratio of the molybdenum disulfide nanosheets, the thiol-containing organics, and water is (0.05-0.2): 0.1-15): 5-100.
In some embodiments, the molybdenum disulfide nanosheets can be purchased directly or prepared by electrochemical liquid phase ultrasonic stripping by conventional methods, and the particle size of the molybdenum disulfide nanosheets is less than or equal to 100nm.
Based on the same inventive concept, the embodiment of the application also provides a functional molybdenum disulfide, which is prepared by adopting the preparation method.
Based on the same inventive concept, the embodiment of the application also provides the photo-thermal coating, and the functionalized molybdenum disulfide.
In some embodiments, the photothermal coating further comprises: binder, thickener, dispersant and surfactant.
In some embodiments, the binder is an aqueous polyurethane emulsion;
and/or the thickener comprises carboxymethyl cellulose and/or hydroxyethyl cellulose;
And/or the dispersant comprises water and isopropanol, wherein the mass ratio of the water to the isopropanol is (30-60): 30-60;
and/or the surfactant is sodium dodecyl benzene sulfonate.
In some embodiments, the mass ratio of the functionalized molybdenum disulfide, the binder, the thickener, the dispersant, and the surfactant is (1-5): 5-25): 1-10): 30-120): 0.01-0.05.
Specifically, in some embodiments, the photothermal coating comprises the following components in parts by weight:
Carboxyl functional molybdenum disulfide: 1-5 parts;
water: 30-60 parts;
Isopropyl alcohol: 30-60 parts;
Sodium dodecyl benzene sulfonate: 0.01 to 0.05 part;
aqueous polyurethane emulsion: 5-25 parts;
hydroxyethyl cellulose: 1-5 parts.
In some embodiments, the photothermal coating comprises the following components in parts by weight:
hydroxyl-functionalized molybdenum disulfide: 1-5 parts;
water: 30-60 parts;
Isopropyl alcohol: 30-60 parts;
Sodium dodecyl benzene sulfonate: 0.01 to 0.05 part;
aqueous polyurethane emulsion: 5-25 parts;
hydroxymethyl cellulose: 1-5 parts.
In some embodiments, the photothermal coating comprises the following components in parts by weight:
Amino-functional molybdenum disulfide: 1-5 parts;
water: 30-60 parts;
Isopropyl alcohol: 30-60 parts;
Sodium dodecyl benzene sulfonate: 0.01 to 0.05 part;
aqueous polyurethane emulsion: 5-25 parts;
hydroxymethyl cellulose: 1-5 parts.
According to the photo-thermal coating, aqueous polyurethane emulsion is used as a binder, carboxymethyl cellulose and hydroxyethyl cellulose are used as thickening agents, and simultaneously hydroxyl and amino functional molybdenum disulfide is combined with the carboxymethyl cellulose in a reaction manner, and carboxyl functional molybdenum disulfide is combined with the hydroxyethyl cellulose; the dispersing agent (water and isopropanol solution), the binder (aqueous polyurethane emulsion) and the thickener (carboxymethyl cellulose and hydroxyethyl cellulose) used in the paint are green and nontoxic, and do not bring negative effects to the environment;
specifically, the chemical formula of the functionalized molybdenum disulfide is shown in fig. 6.
The chemical formula of the aqueous polyurethane is as follows:
The chemical formula of the hydroxymethyl cellulose is as follows:
The chemical formula of the hydroxyethyl cellulose is as follows:
The reactions that occur with functionalized molybdenum disulfide, aqueous polyurethane, and hydroxymethyl cellulose/hydroxyethyl cellulose are shown in figure 7.
Based on the same inventive concept, the embodiment of the application also provides a preparation method of the photo-thermal coating, which comprises the following steps:
adding the functionalized molybdenum disulfide into the dispersing agent, adding the surfactant, stirring, adding the binder and the thickener, and continuously stirring to obtain the photo-thermal coating.
According to the preparation method of the photo-thermal coating, the functionalized molybdenum disulfide is dispersed in isopropanol and aqueous solution, and the surfactant sodium dodecyl benzene sulfonate is added to ensure the solution stability; the aqueous polyurethane emulsion is used as a binder, and the carboxymethyl cellulose and the hydroxyethyl cellulose are used as thickening agents, so that molybdenum disulfide is stably dispersed in a solution system and cannot be precipitated, the prepared coating is waterproof, and the coating cannot fall off when being applied in a water environment; the molybdenum disulfide is coated on a proper substrate for large-scale and low-cost green application.
Based on the same inventive concept, the embodiment of the application also provides an application of the photo-thermal coating or the photo-thermal coating prepared by the preparation method as a photo-thermal material.
Specifically, the photo-thermal coating is coated on polyurethane sponge to prepare the photo-thermal device for evaporating the brine.
The following further illustrates the functionalized molybdenum disulfide of the present application and its preparation method, photothermal coating and application thereof in specific examples. This section further illustrates the summary of the application in connection with specific embodiments, but should not be construed as limiting the application. The technical means employed in the examples are conventional means well known to those skilled in the art, unless specifically stated. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present application are those conventional in the art.
Example 1
The embodiment of the application provides a preparation method of functionalized molybdenum disulfide, which comprises the following steps:
s1, mixing 0.1g of molybdenum disulfide nanosheets with 10mL of thioglycollic acid, performing ultrasonic treatment for 2 hours, magnetically stirring for 24 hours, filtering, washing and drying to obtain carboxyl functionalized molybdenum disulfide (COOH-MoS 2).
Example 2
The embodiment of the application provides a preparation method of functionalized molybdenum disulfide, which comprises the following steps:
S1, dissolving 0.8mL of mercaptoacetic acid in 100mL of water, adding 0.1g of molybdenum disulfide nanosheets, performing ultrasonic treatment for 2h, magnetically stirring for 24h, filtering, washing and drying to obtain hydroxyl functional molybdenum disulfide (OH-MoS 2).
Example 3
The embodiment of the application provides a preparation method of functionalized molybdenum disulfide, which comprises the following steps:
S1, adding 0.2g of mercaptoethylamine into 5mL of water, adding 0.1g of molybdenum disulfide nanosheets, performing ultrasonic treatment for 2h, magnetically stirring for 24h, filtering, washing and drying to obtain amino functionalized molybdenum disulfide (NH 2-MoS2).
Example 4
The embodiment of the application provides a photo-thermal coating, which comprises the following raw materials: 1g of carboxyl functional molybdenum disulfide (COOH-MoS 2), 25mL of isopropanol, 25mL of deionized water, 0.02g of sodium dodecyl benzene sulfonate, 15mL of aqueous polyurethane emulsion (Milin W909579 aqueous polyurethane) and 50mL of 0.2g/L of hydroxyethyl cellulose aqueous solution;
The preparation method of the carboxyl functional molybdenum disulfide comprises the following steps: mixing 1g of molybdenum disulfide nanosheets with 100mL of thioglycollic acid, performing ultrasonic treatment for 2 hours, then magnetically stirring for 24 hours, filtering, washing and drying to obtain carboxyl functionalized molybdenum disulfide (COOH-MoS 2);
The preparation method of the photo-thermal coating comprises the following steps: and mixing carboxyl functional molybdenum disulfide (COOH-MoS 2) with isopropanol and deionized water, adding sodium dodecyl benzene sulfonate, aqueous polyurethane emulsion and hydroxyethyl cellulose aqueous solution, mixing, and stirring to obtain the photo-thermal coating.
Example 5
The embodiment of the application provides a photo-thermal coating, which comprises the following raw materials: 1g of hydroxyl functional molybdenum disulfide (OH-MoS 2), 25mL of isopropanol, 25mL of deionized water, 0.02g of sodium dodecyl benzene sulfonate, 15mL of aqueous polyurethane emulsion and 50mL of 0.2g/L carboxymethyl cellulose water solution;
The preparation method of the hydroxyl functional molybdenum disulfide comprises the following steps: dissolving 8mL of mercaptoacetic acid in 1000mL of water, adding 1g of molybdenum disulfide nanosheets, performing ultrasonic treatment for 2 hours, magnetically stirring for 24 hours, filtering, washing and drying to obtain hydroxyl functionalized molybdenum disulfide (OH-MoS 2);
The preparation method of the photo-thermal coating comprises the following steps: mixing hydroxyl functional molybdenum disulfide (OH-MoS 2) with isopropanol and deionized water, adding sodium dodecyl benzene sulfonate, aqueous polyurethane emulsion and carboxymethyl cellulose aqueous solution, mixing, and stirring to obtain the photo-thermal coating.
Example 6
The embodiment of the application provides a photo-thermal coating, which comprises the following raw materials: 1g of amino functional molybdenum disulfide (NH 2-MoS2), 25mL of isopropanol, 25mL of deionized water, 0.02g of sodium dodecyl benzene sulfonate, 15mL of aqueous polyurethane emulsion and 50mL of 0.2g/L carboxymethyl cellulose water solution;
The preparation method of the amino-functionalized molybdenum disulfide (NH 2-MoS2) comprises the following steps: adding 2g of mercaptoethylamine into 50mL of water, adding 1g of molybdenum disulfide nanosheets, performing ultrasonic treatment for 2 hours, magnetically stirring for 24 hours, filtering, washing and drying to obtain amino functionalized molybdenum disulfide (NH 2-MoS2);
The preparation method of the photo-thermal coating comprises the following steps: mixing amino-functionalized molybdenum disulfide (NH 2-MoS2) with isopropanol and deionized water, adding sodium dodecyl benzene sulfonate, aqueous polyurethane emulsion and carboxymethyl cellulose aqueous solution, mixing, and stirring to obtain the photo-thermal coating.
Comparative example 1
The embodiment of the application provides a photo-thermal coating, which comprises the following raw materials: 1g of molybdenum disulfide nanosheets, 25mL of isopropanol, 25mL of deionized water, 0.02g of sodium dodecyl benzene sulfonate, 15mL of aqueous polyurethane emulsion and 50mL of 0.2g/L carboxymethyl cellulose aqueous solution;
the preparation method of the photo-thermal coating comprises the following steps: mixing molybdenum disulfide with isopropanol and deionized water, adding sodium dodecyl benzene sulfonate, aqueous polyurethane emulsion and carboxymethyl cellulose aqueous solution, mixing, and stirring to obtain the photo-thermal coating.
Performance testing
The infrared spectra of the carboxyl functional molybdenum disulfide (COOH-MoS 2), hydroxyl functional molybdenum disulfide (OH-MoS 2), amino functional molybdenum disulfide (NH 2-MoS2) and molybdenum disulfide nanosheets prepared in examples 1 to 3 are shown in FIG. 1. In FIG. 1, a is molybdenum disulfide nanosheets without any treatment, b is amino functionalized molybdenum disulfide (NH 2-MoS2), c is hydroxyl functionalized molybdenum disulfide (OH-MoS 2), and d is carboxyl functionalized molybdenum disulfide (COOH-MoS 2).
As can be seen from FIG. 1, the modified molybdenum disulfide surface contains corresponding functional groups.
The photo-thermal coating materials obtained in examples 4 to 6 and comparative example 1 were coated on polyurethane sponge having a diameter of 4cm and a thickness of 2cm, and the coating thickness was controlled to 1cm to prepare four photo-thermal evaporators; wherein, the evaporator made of the photo-thermal coating (added with unmodified molybdenum disulfide nanosheets) in comparative example 1 was designated MPPU, the evaporator made of the photo-thermal coating (added with carboxyl functional molybdenum disulfide) in example 4 was designated CMPPU, the evaporator made of the photo-thermal coating (added with hydroxyl functional molybdenum disulfide) in example 5 was designated OMPPU, and the evaporator made of the photo-thermal coating (added with amino functional molybdenum disulfide) in example 6 was designated NMPPU.
FIG. 2 is a schematic diagram of an evaporator made of the photo-thermal coating in example 4.
The different evaporators prepared by the method are placed in brine and irradiated under the light intensity of 1KW m -2, meanwhile, brine without the addition of the evaporators (namely no evaporators in the figure) is irradiated under the light intensity of 1KW m -2 to be used as a comparison, and polyurethane sponge without the photo-thermal paint is placed in brine and irradiated under the light intensity of 1KW m -2 to be used as a comparison; the photo-thermal evaporation effect of different evaporators was tested and the results are shown in fig. 3 to 5.
Fig. 3 shows the quality change of brine with time, and as can be seen from fig. 3, the quality change of brine with time is initially smooth, the quality change of the evaporator with four kinds of load molybdenum disulfide is linearly changed with the continuous irradiation water quantity change, the quality change of the evaporator with four kinds of load molybdenum disulfide is obviously increased, in addition, the water quantity change of the functionalized molybdenum disulfide evaporator is larger, which is probably because the hydrophilicity of the modified molybdenum disulfide is better, thereby being beneficial to photo-thermal evaporation, and in addition, the functionalization makes the load of molybdenum disulfide more compact.
Fig. 4 shows the evaporation rates and corresponding evaporation efficiencies of several evaporators at a light intensity of 1KW m -2, the evaporation rate of the polyurethane sponge evaporator (PPU) being 0.4697kg m -2h-1, increasing (MPPU) to 0.9395kg m -2h-1 after loading of molybdenum disulfide, the evaporation rates of the three functionalized molybdenum disulfide evaporators being (CMPPU)1.0111kg m-2h-1、(OMPPU)1.1226kg m-2h-1、(NMPPU)1.0987kg m-2h-1., respectively, 67.3% of the evaporation efficiency of the functionalized molybdenum disulfide evaporator compared to the molybdenum disulfide evaporator (MPPU).
Fig. 5 shows that the surface temperature of the modified molybdenum disulfide evaporator is higher when the four different evaporators are subjected to illumination for 1h at the temperature of 1KW m -2, and the surface temperature of the modified molybdenum disulfide evaporator is obviously increased, wherein the surface temperature of the functionalized molybdenum disulfide evaporator is up to 49.1 ℃, and the polyurethane sponge is provided with more molybdenum disulfide, so that the polyurethane sponge has better heat absorption and heat preservation effects.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. A photo-thermal coating is characterized by comprising functionalized molybdenum disulfide;
further comprises: a binder, a thickener, a dispersant and a surfactant;
The binder is aqueous polyurethane emulsion;
the thickener comprises carboxymethyl cellulose and/or hydroxyethyl cellulose;
the dispersant comprises water and isopropanol;
the surfactant is sodium dodecyl benzene sulfonate;
The mass ratio of the functionalized molybdenum disulfide to the binder to the thickener to the dispersant to the surfactant is (1-5): 5-25): 1-10): 30-120): 0.01-0.05;
the preparation method of the functionalized molybdenum disulfide comprises the following steps:
reacting the molybdenum disulfide nanosheets with organic matters containing sulfhydryl groups to obtain functional molybdenum disulfide;
wherein the organic matter containing sulfhydryl is thioglycerol.
2. The photo-thermal paint according to claim 1, wherein the functionalized molybdenum disulfide is obtained by mixing molybdenum disulfide nanosheets, mercapto-containing organic matter and water, performing ultrasonic treatment for 1-5 hours, stirring for 20-30 hours, and filtering.
3. The photo-thermal coating according to claim 2, wherein the mass ratio of the molybdenum disulfide nanosheets, the mercapto group-containing organic matter and water is (0.05-0.2): 0.1-15): 5-100.
4. A method for preparing a photothermal coating according to any one of claims 1 to 3, comprising the steps of: adding the functionalized molybdenum disulfide into the dispersing agent, adding the surfactant, stirring, adding the binder and the thickener, and continuously stirring to obtain the photo-thermal coating.
5. Use of a photothermal coating as defined in any one of claims 1 to 3 or a photothermal coating prepared by the preparation method of claim 4 as a photothermal material.
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