CN109439188B - Super-hydrophobic photo-thermal coating and preparation method thereof - Google Patents

Abstract

The invention discloses a super-hydrophobic photothermal coating and a preparation method thereof. The hydrophobic coating comprises a modified multi-layer MXene compound, a modified single-layer MXene compound, ethyl acetate, polydimethylsiloxane and curing The preparation method is simple and convenient, and it can be fixed on different substrates after spraying, and the hydrophobic surface formed by it has good mechanical and chemical resistance. At the same time, the prepared hydrophobic coating has good photothermal properties, combined with its excellent hydrophobic properties, it has great application potential in the field of light driving.

Description

A kind of superhydrophobic photothermal coating and preparation method thereof

technical field

The invention belongs to the field of materials, and in particular relates to a super-hydrophobic photothermal coating and a preparation method thereof. The preparation method of the hydrophobic coating is simple and convenient, and can be fixed on different substrates after spraying, and the formed hydrophobic surface has Very good mechanical and chemical resistance. At the same time, the prepared hydrophobic coating has good photothermal properties, combined with its excellent hydrophobic properties, it has great application potential in the field of light driving.

Background technique

Superhydrophobic surfaces (water contact angle (CA) greater than 150° and hydroplaning angle less than 10°) have attracted more and more attention due to their self-cleaning, water repellency and other excellent properties, and have broad application prospects, such as water harvesting , oil/water separation, anti-fogging, anti-icing, drag reduction, etc. In the construction of superhydrophobic surfaces, many techniques have also been developed, such as electrodeposition, chemical vapor deposition, templating, electrospinning, and photolithography.

However, a simple and general method for large-scale fabrication of such waterproof surfaces on soft and hard substrates remains highly challenging. Moreover, compared with traditional superhydrophobic surfaces that are only waterproof, the preparation of multifunctional superhydrophobic surfaces has greater application potential and has become a hot spot in surface technology research.

Two-dimensional (2D) nanomaterials possess unique properties (e.g., high light transmittance, flexibility, large surface area, tunable electronic structure, etc.) and exhibit excellent performance and applicability in a wide range of applications. MXenes, as a new type of two-dimensional transition metal carbides or carbonitrides, were discovered by Professor Yury Gogotsi of Drexel University and others. Its general chemical formula can be represented by Mn ₊₁ X _n T _z , wherein M refers to transition metal (such as Ti, Zr, Hf, V, Nb, Ta, Cr, Sc, etc.), X refers to C or/and N, n Generally 1-3, T _z refers to surface groups (eg O ^2- , OH ^- , F ^- , NH ₃ , NH ₄ ⁺ etc.). At present, MXenes have shown great potential in the fields of energy storage, adsorption, sensors, conductive fillers, etc. As a new type of two-dimensional layered compounds, MXenes have excellent photothermal conversion properties and are widely used in photothermal/photodynamic therapy. The field has a wide range of application value. The modified MXenes not only have excellent photothermal properties, but also have good hydrophobicity, which is conducive to the construction of multifunctional superhydrophobic surfaces and has great application potential in the field of light driving. However, 2D-type MXenes are strongly hydrophilic, which may lead to inevitable oxidation in humid air, which in turn affects their reliability. Therefore, it is an important research topic to modify it to change its hydrophilic properties.

SUMMARY OF THE INVENTION

In view of the problems of traditional methods, the present invention provides a super-hydrophobic photothermal coating, which can be fixed on different substrates after spraying, and the hydrophobic surface formed by the coating has good self-cleaning performance, and has good mechanical, Chemical resistance.

The superhydrophobic photothermal coating includes a modified multi-layer MXene compound, a modified single-layer MXene compound, ethyl acetate, polydimethylsiloxane and a curing agent, wherein the modified multi-layer MXene compound and all The weight ratio of the modified monolayer MXene compound is 1:2 to 2:1.

Preferably, the weight ratio of the modified multi-layer MXene compound and the modified single-layer MXene compound in the superhydrophobic photothermal coating according to the present invention is 1:1 and 2:1, more preferably 1:1.

Preferably, in the superhydrophobic photothermal coating, based on 100 parts by weight of the total weight of the modified multi-layer MXene compound and the modified single-layer MXene compound, the polydimethylsilicon The amount of oxane used is 50 to 300 parts by weight, more preferably 50 to 200 parts by weight, and still more preferably 150 parts by weight.

Preferably, in the superhydrophobic photothermal coating, based on 100 parts by weight of the total weight of the modified multi-layer MXene compound and the modified single-layer MXene compound, the amount of ethyl acetate is 8,000 to 13,000 parts by weight, more preferably 9,000 to 11,000 parts by weight, still more preferably 10,000 parts by weight.

Preferably, in the superhydrophobic photothermal coating, based on 100 parts by weight of the total weight of the modified multi-layer MXene compound and the modified single-layer MXene compound, the amount of the curing agent is 5 to 30 parts by weight, more preferably 5 to 20 parts by weight, still more preferably 15 parts by weight.

According to another aspect of the present invention, an object of the present invention is to provide a preparation method of a superhydrophobic photothermal coating, comprising the following steps:

1) Preparation of multilayer/monolayer MXene compounds

Add 1 part by weight of Ti ₃ AlC ₂ powder into 10 parts by weight of HF solution with a mass fraction of 10-80wt% and stir for 12-36h; the suspension obtained after the reaction is centrifuged at 3500r/min×5min and washed with deionized water until The PH of the supernatant is ≥ 5, and the supernatant is poured out to obtain a multi-layer MXene compound precipitate; 1 part by weight of the multi-layer MXene compound precipitate is added to 10 parts by weight of tetrapropylammonium hydroxide whose mass fraction is 10-50wt% , stirred at room temperature for 1-5 days, centrifuged at 3500 r/min for 1 h, collected the supernatant, and lyophilized to obtain a monolayer of MXene compound.

2) Modified multilayer/monolayer MXene compounds

Add 400 parts by weight of perfluorinated compound to 35 parts by weight of ethanol and stir at room temperature for 0.5-2 h; disperse the multi-layer/single-layer MXene compound obtained in step 1) into the above perfluoro compound in a weight ratio of 1:2 to 2:1 In the ethanol dispersion of the compound, the mixture is stirred at room temperature for 1-5 h, and centrifuged to obtain the modified multi-layer/monolayer MXene compound, wherein the total amount of the multi-layer/monolayer MXene compound is 100 parts by weight.

3) Under stirring conditions, 50 to 300 parts by weight of polydimethylsiloxane (PDMS) and 15 parts by weight of curing agent are added to 10,000 parts by weight of ethyl acetate, while 2) the obtained perfluorinated compound is added. The modified multi-layer/single-layer MXene compound was added to ethyl acetate, and after stirring for 30 min, the obtained superhydrophobic coating was sprayed onto the substrate, heated to 70 to 180 °C, and cured for 10-60 min to obtain superhydrophobic and excellent optical properties. Thermal performance of the surface.

The perfluorinated compound is selected from the group consisting of perfluorooctyltriethoxysilane, heptafluorodecyltriethoxysilane and perfluorodecyltrimethoxysilane.

The curing agent is Dow Corning SYLGARD 184PDMS supporting curing agent.

Preferably, the mass fraction of HF described in step 1) is preferably 10-80 wt %, more preferably 50 wt %; the stirring time is 12-36 h, more preferably 18 h; the mass fraction of tetrapropylammonium hydroxide is 10-50wt%, more preferably 25wt%, stirring at room temperature for 1-5 days, more preferably 3 days;

Preferably, the perfluoro compound described in step 2) is added to ethanol and stirred at room temperature for 0.5-2 h, more preferably 1 h; the multi-layer/single-layer MXene compound is dispersed in the perfluoro compound in a weight ratio of 1:2 to 2:1 In the ethanol dispersion, it is more preferably 1:1; stirring at room temperature is 1-5h, more preferably 3h;

Preferably, in step 3), 50 to 300 parts by weight of polydimethylsiloxane, more preferably 150 parts by weight; heating to 70 to 180° C., more preferably 120° C.; curing for 10-60 min, more More preferably, it is 30 min.

The preparation method according to the present invention comprises the following steps:

1) Preparation of multilayer/monolayer MXene compounds

Add 1 part by weight of Ti ₃ AlC ₂ powder to 10 parts by weight of HF solution with a mass fraction of 50 wt % and stir for 18 hours; the suspension obtained after the reaction is centrifuged at 3500 r/min × 5 min and washed with deionized water until the pH of the supernatant is reached ≥5, pour out the supernatant to obtain a multi-layer MXene compound precipitate; add 1 part by weight of the precipitate to 10 parts by weight of tetrapropylammonium hydroxide with a mass fraction of 25wt%, stir at room temperature for 3 days, and centrifuge at 3500r/min for 1h , collect the supernatant, freeze-dried to obtain monolayer MXene compound;

2) Modified multilayer/monolayer MXene compounds

Add 400 parts by weight of perfluoride to 35 parts by weight of ethanol and stir at room temperature for 1 h; disperse the multi-layer/single-layer MXene obtained in step 1) into the above perfluorinated ethanol dispersion at a weight ratio of 1:1, at room temperature After stirring for 3 hours, the modified multi-layer/monolayer MXene compound was obtained by centrifugation, wherein the total amount of the multi-layer/monolayer MXene compound was 100 parts by weight.

3) Under stirring conditions, 150 parts by weight of polydimethylsiloxane (PDMS) and 15 parts by weight of curing agent were added to 10,000 parts by weight of ethyl acetate, and 2) the obtained perfluoride was modified at the same time. The multi-layer/single-layer MXene compound was added to ethyl acetate, and after stirring for 30 min, the obtained superhydrophobic coating was sprayed onto different substrates, heated to 120 °C, and cured for 30 min to obtain a surface with superhydrophobicity and excellent photothermal properties.

beneficial effect

1. According to the preparation method of the superhydrophobic photothermal coating of the present invention, the preparation method is simple and convenient and has a wide application range;

2. The super-hydrophobic photothermal coating according to the present invention can be fixed on different substrates after spraying, and the hydrophobic surface formed by it has good self-cleaning performance, good mechanical toughness and chemical resistance;

3. The superhydrophobic photothermal coating according to the present invention has good photothermal performance;

4. The coating prepared according to the present invention combines its super-hydrophobicity and photothermal properties, and can realize precise remote optical-drive object movement.

Description of drawings

FIG. 1 is a flow chart of the preparation of the superhydrophobic photothermal MXene coating according to the present invention.

FIG. 2 is an X-ray diffraction pattern of the multilayer/monolayer MXene and the precursor Ti ₃ AlC ₂ prepared according to Example 1. FIG.

3 is a scanning electron microscope image of a multilayer MXene prepared according to Example 1 and a transmission electron microscope image of a single-layer MXene.

4 is a photoelectron spectrum diagram and a Fourier transform infrared spectrum diagram of the multi-layer/single-layer MXene modified by perfluoride according to Example 1.

5 is a scanning electron microscope image of the superhydrophobic MXene coating prepared according to Example 1.

6 is an atomic force microscope image of the superhydrophobic MXene coating prepared according to Example 1.

7 is a graph of contact angle test data for hydrophobic coatings prepared according to different multi-layer/single-layer MXene weight ratios in Examples 1 to 3 and Comparative Examples 1 to 2.

8 is a photo, a scanning electron microscope image and a contact angle test image of the superhydrophobic MXene coating prepared according to Example 1 coated on cotton cloth and glass plate respectively.

9 is the change of the water contact angle of the superhydrophobic MXene coating prepared according to Example 1 after the friction test and the adhesion test.

FIG. 10 is the change of water contact angle of the superhydrophobic MXene coating prepared according to Example 1 after acid and alkali treatment.

11 is a self-cleaning test of the superhydrophobic MXene coating prepared according to Example 1.

12 is a photothermal performance test of the superhydrophobic MXene coatings prepared according to Examples 1 to 3 and Comparative Examples 1 to 2.

13 is a test of the photostability and photothermal conversion rate of the superhydrophobic MXene coating prepared according to Example 1.

FIG. 14 is a light-driven test of the superhydrophobic MXene coating prepared according to Example 1. FIG.

Detailed ways

After the superhydrophobic MXene coating prepared according to the preparation method of the present invention is coated on the surfaces of different substrates, the obtained superhydrophobic surface not only has excellent hydrophobicity and self-cleaning properties, but also has good mechanical and chemical resistance. FIG. 1 is a flow chart of the preparation of the superhydrophobic photothermal MXene coating according to the present invention.

In the preparation method according to the present invention, the multi-layer/single-layer MXene is dispersed in the perfluorinated ethanol dispersion liquid at a weight ratio of 1:2 to 2:1, more preferably 1:1 and 2:1, further Preferably 1:1. When the weight ratio of multi-layer/single-layer MXene is too small, for example, less than 1:2, the roughness of the coating is insufficient, the surface hydrophobicity is insufficient, and the super-hydrophobic effect cannot be achieved. When the ratio is too large, for example, greater than 2:1, the hydrophobicity of the coating surface will become poor, and its photothermal performance will also decrease.

In the preparation method according to the present invention, based on 100 parts by weight of the total weight of both the modified multi-layer MXene compound and the modified single-layer MXene compound, 50 to 300 parts by weight of polydimethylsilicon Oxane is dispersed in ethyl acetate, more preferably 50 to 200 parts by weight, still more preferably 150 parts by weight. When the amount of polydimethylsiloxane is less than 50 parts by weight, the adhesion of the coating to the substrate will be poor, and when the amount of polydimethylsiloxane is more than 300 parts by weight, the roughness of the coating becomes lower, and the hydrophobicity becomes worse.

In the preparation method according to the present invention, the polydimethylsiloxane reacts and cures with a curing agent at a high temperature to act as a binder, and the modified hydrophobic multi-layer MXene and few-layer MXene can be combined Bonding to the substrate plays an important role in the surface mechanical toughness of the product.

In the preparation method according to the present invention, 5 to 30 parts by weight of a curing agent (Dow Corning SYLGARD 184PDMS supporting curing agent) is dispersed in ethyl acetate, more preferably 5 to 20 parts by weight, still more preferably 15 parts by weight. When the curing agent is less than 5 parts by weight, the polydimethylsiloxane cannot be completely cured, resulting in residual unreacted polydimethylsiloxane on the surface of the coating after heating, and the hydrophobicity becomes poor; when the curing agent is greater than 30 In parts by weight, the excess part of the curing agent does not react with the polydimethylsiloxane, resulting in curing agent residues on the surface of the coating after heating, and the hydrophobicity also deteriorates.

The superhydrophobic MXene coating prepared according to the preparation method of the present invention has excellent and stable photothermal properties, and its conversion efficiency can reach 30.3%.

After the superhydrophobic photothermal MXene coating prepared according to the preparation method of the present invention is coated on the surface of the substrate, under the irradiation of an infrared laser lamp, the object can be accurately and remotely driven by light.

Hereinafter, the present invention will be described in detail. Before proceeding with the description, it should be understood that the terms used in this specification and the appended claims should not be construed to be limited to ordinary and dictionary meanings, but should be used in the context of allowing the inventor to properly define the terms for best interpretation On the basis of the principles of the present invention, explanations are made according to meanings and concepts corresponding to the technical aspects of the present invention. Accordingly, the descriptions presented herein are merely preferred examples for illustrative purposes and are not intended to limit the scope of the invention, whereby it is to be understood that other, etc. may be derived therefrom without departing from the spirit and scope of the invention. price or improvement.

The following examples are only listed as examples of the embodiments of the present invention, and do not constitute any limitation to the present invention. Those skilled in the art can understand that modifications within the scope of the spirit and concept of the present invention are all within the protection of the present invention. scope. Unless otherwise specified, the reagents and instruments used in the following examples are commercially available products.

Example 1

1) Preparation of multilayer/monolayer MXene compounds

Add 1 part by weight of Ti ₃ AlC ₂ powder to 10 parts by weight of HF solution with a mass fraction of 50 wt % and stir for 18 hours; the suspension obtained after the reaction is centrifuged at 3500 r/min × 5 min and washed with deionized water until the pH of the supernatant is reached ≥5, pour out the supernatant to obtain a multi-layer MXene compound precipitate; add 1 part by weight of the precipitate to 10 parts by weight of tetrapropylammonium hydroxide with a mass fraction of 25wt%, stir at room temperature for 3 days, and centrifuge at 3500r/min for 1h , the supernatant was collected and lyophilized to obtain a monolayer of MXene compound.

2) Modified multilayer/monolayer MXene compounds

400 parts by weight of perfluorooctyltriethoxysilicon was added to 35 parts by weight of ethanol and stirred at room temperature for 1 h; the multi-layer/single-layer MXene obtained in step 1) was dispersed in the above perfluorooctane at a weight ratio of 1:1 The modified multi-layer/monolayer MXene compound was obtained by centrifugation, wherein the total amount of the multi-layer/monolayer MXene compound was 100 parts by weight.

3) Under stirring conditions, 150 parts by weight of polydimethylsiloxane (PDMS) and 15 parts by weight of curing agent were added to 10,000 parts by weight of ethyl acetate, and 2) the obtained perfluorooctyl triacetate was added simultaneously. The multi-layer/monolayer MXene compound modified by ethoxylated silicon (the total amount of the multi-layer/monolayer MXene compound is 100 parts by weight) was added to ethyl acetate, and after stirring for 30min, the obtained superhydrophobic coating ( PDMS@m/dF ₂ ) was sprayed onto different substrates and heated to 120 °C for 30 min to cure to obtain a surface with superhydrophobicity and excellent photothermal properties.

As shown in Figure 2, the prepared multi-layer/single-layer MXene and the precursor Ti ₃ AlC ₂ were analyzed by X-ray diffraction (XRD), and the characteristic peak of MXene (002) shifted from 9.5° to 9.0°, and then shifted to 9.0°. Moving to 7.0°, the interlayer spacing gradually increases, indicating that the Al layer in Ti ₃ AlC ₂ is successfully etched away, and the etching and stripping of MXene are achieved.

As shown in Figure 3, the as-prepared multilayer/monolayer MXenes were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), further demonstrating the successful synthesis of multilayer/monolayer MXenes.

As shown in Figure 4, the Si element in the photoelectron spectroscopy (XPS) analysis of the prepared modified multi-layer/monolayer MXene, and the perfluorooctyl triethoxy in the Fourier transform infrared spectrum (FTIR) Silicon characteristic peaks 1020 (Si-O) and 698 (C-Si) were found, indicating the successful modification of MXene by perfluoride.

As shown in Figure 5, the as-prepared MXene coatings were analyzed by scanning electron microscopy (SEM), which demonstrated the successful synthesis of their micro-nano rough surface structure.

As shown in Figure 6, the as-prepared MXene coating was analyzed by atomic force scanning electron microscopy (AFM), which further proved the successful synthesis of its micro-nano rough surface structure.

As shown in Figure 8, the MXene-coated PDMS@m/dF ₂ prepared in Example 1 was sprayed onto cotton cloth (a) and glass plate (b), and both substrate surfaces achieved superhydrophobicity.

Example 2

A hydrophobic photothermal MXene coating ( PDMS@m/dF ₁ ).

Example 3

A hydrophobic photothermal MXene coating ( PDMS@m/dF ₃ ).

Comparative Example 1

A hydrophobic photothermal MXene coating (PDMS@m-F) was prepared according to the same preparation steps as in Example 1, except that only the multi-layer MXene was dispersed into the above perfluorooctyltriethoxysilicone ethanol dispersion.

Comparative Example 2

A hydrophobic photothermal MXene coating (PDMS@d-F) was prepared according to the same preparation steps as in Example 1, except that only a single layer of MXene was dispersed into the above perfluorooctyltriethoxysilyl alcohol dispersion.

As shown in Figure 7, the surface water contact angle test was performed on the coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 2, and the comparison showed that the MXene coatings prepared in Example 1 PDMS@m/dF ₂ were superhydrophobic However, the MXene coatings (PDMS@mF) and MXene coatings (PDMS@dF) prepared in Comparative Examples 1 and 2, respectively, have unsatisfactory hydrophobic properties.

Experimental Example 1: Surface Mechanical Toughness Experiment

Friction resistance test: The filter paper sprayed with the coating PDMS@m/dF ₂ prepared in Example 1 is attached to a glass slide, the side containing the coating is placed on the sandpaper, and a weight of 200g is placed on it. , push the glass radially by 10cm with tweezers, rotate the glass slide by 90°, and push it in the opposite direction by 10cm, which is a cycle;

Adhesion experiment: use double-sided tape to adhere the surface coating, and then peel off the tape, which is a cycle.

Figure 9 shows the change of the surface water contact angle of the coating PDMS@m/dF ₂ coating prepared in Example 1 after multiple rubbing and gluing tests on the filter paper. The test results show that after mechanical damage, the coating The surface still exhibits good superhydrophobicity, indicating its excellent mechanical toughness.

Experimental Example 2: Surface Chemical Resistance Test

The glass sheet coated with the PDMS@m/dF ₂ coating prepared in Example 1 was immersed in hydrochloric acid (pH=1) and sodium hydroxide (pH=14) solutions for different times, and the water contact angle was measured. .

Fig. 10 shows the change of the surface water contact angle of the PDMS@m/dF ₂ coating prepared in Example 1 after being immersed in acid and alkali solutions for different times after being adhered to a glass sheet. The test results show that after chemical treatment, the coating surface still remains It exhibits good superhydrophobicity, indicating its excellent chemical resistance.

Experimental Example 3: Self-cleaning experiment

a. Place a small amount of dust on the surface of the PDMS@m/dF ₂ coating prepared in Example 1, drop deionized water on its upper end, and test its self-cleaning property; b. The PDMS@m/dF 2 coating prepared in Example 1 Use a dropper to drop several common liquids (deionized water, tap water, coffee, milk, watermelon juice, orange juice and other liquids) on the top of the surface of the m/dF ₂ coating, and observe the effect of the coating on these liquids. exclusion.

Figure 11 The effect of the self-cleaning experiment, Figure a shows that the dust was successfully carried away from the coating surface under the flow of water without leaving traces of soil infection, Figure b shows the PDMS@m prepared in Example 1 The repellency of the /dF ₂ coating to various liquids, and these droplets all showed spherical shape on the coating surface. These results indicate the self-cleaning property of the PDMS@m/dF ₂ coating prepared in Example 1.

Experimental Example 4: Photothermal Performance Test

The coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 2 were coated on filter paper, the coatings were irradiated with 808nm near-infrared lasers of different intensities, and the surface temperature of the coatings was monitored by an infrared thermal imager (FLIRA325SC camera). The change.

Figure 12 is a graph showing the photothermal test results of the coatings prepared according to Examples 1 to 3 and Comparative Examples 1 to 2. It can be seen from the figure that under the irradiation of infrared laser, the coatings containing MXene can be processed within 60s When the temperature rises to about 100 °C, it shows that it has good photothermal performance.

Fig. 13a is the photostability test chart of the PDMS@m/dF ₂ coating prepared according to Example 1. After many times of on/off, the MXene coating still has good photothermal performance, indicating that it has a good photothermal performance. The photothermal stability of PDMS@m/dF ₂ coating was calculated according to Fig. 13b, and the photothermal conversion rate was 30.3%.

Experimental Example 5: Light Drive Test

The coated PDMS@m/dF2 prepared in Example ₁ was coated on both sides of a filter paper with a specific shape, and 1W/ ^cm2 of 808 nm near-infrared laser was used to irradiate different positions of the coated filter paper to achieve different long-range light driving behaviors .

Figure 14 shows that the PDMS@m/dF coating prepared according to Example ₁ can achieve different light-driven behaviors (a linear motion, b left turning motion, c clockwise rotational movement).

The above examples are only listed as examples of embodiments of the present invention, and do not constitute any limitation to the present invention. Those skilled in the art can understand that modifications within the scope of the spirit and concept of the present invention are all within the protection of the present invention. scope.

Claims (4)

1. A preparation method of a super-hydrophobic photo-thermal coating comprises the following steps:

1) preparation of multilayer MXene Compound and monolayer MXene Compound

Mixing 1 part by weight of Ti₃AlC₂Adding the powder into 10 parts by weight of HF solution with the mass fraction of 10-80 wt%, stirring for 12-36h, centrifuging suspension obtained after reaction for 3500r/min × 5min, washing with deionized water until the pH value of supernatant is more than or equal to 5, pouring out supernatant to obtain multilayer MXene compound precipitate, adding 1 part by weight of multilayer MXene compound precipitate into 10 parts by weight of tetrapropylammonium hydroxide with the mass fraction of 10-50 wt%, stirring for 1-5 days at room temperature, centrifuging for 1h at 3500r/min, collecting supernatant, and freeze-drying to obtain single-layer MXene compound;

2) preparation of modified Multi-layer MXene Compound and modified Single-layer MXene Compound

Adding 400 parts by weight of perfluorinated compounds into 35 parts by weight of ethanol, and stirring for 0.5-2h at room temperature to obtain perfluorinated compound ethanol dispersion; dispersing the multilayer MXene compound and the monolayer MXene compound obtained in the step 1) into the perfluorinated compound ethanol dispersion liquid according to the weight ratio of 1:2 to 2:1, stirring at room temperature for 1-5h, and centrifuging to obtain a modified multilayer MXene compound and a modified monolayer MXene compound, wherein the total amount of the multilayer MXene compound and the monolayer MXene compound is 100 parts by weight;

3) adding 50-300 parts by weight of polydimethylsiloxane PDMS and 15 parts by weight of curing agent into 10000 parts by weight of ethyl acetate under stirring, simultaneously adding the perfluorinated compound modified multilayer MXene compound and the modified single-layer MXene compound obtained in the step 2) into the ethyl acetate, stirring for 30min, spraying the obtained super-hydrophobic coating on a substrate, heating to 70-180 ℃, and curing for 10-60min to obtain a surface with super-hydrophobic and photo-thermal properties;

the perfluoro compound is selected from perfluorooctyl triethoxy silicon, heptadecafluorodecyl triethoxy silane and perfluorodecyl trimethoxy silane;

the curing agent is a Dow Corning SYLGARD 184PDMS matched curing agent.

2. According to claim1 the preparation method of the super-hydrophobic photo-thermal coating, which is characterized in that 1 part by weight of Ti is added in the step 1)₃AlC₂Adding the powder into 10 parts by weight of HF solution with the mass fraction of 50 wt% and stirring for 18 hours; the mass fraction of tetrapropylammonium hydroxide was 25 wt%, and the mixture was stirred at room temperature for 3 days.

3. The method for preparing a superhydrophobic photo-thermal coating according to claim 1, wherein the perfluoro compound is added into ethanol in the step 2) and stirred for 1h at room temperature; the multi-layer MXene compound and the single-layer MXene compound are dispersed into the perfluorinated ethanol dispersion liquid according to the weight ratio of 1:1, and stirred for 3 hours at room temperature.

4. The method for preparing a superhydrophobic photo-thermal coating layer according to claim 1, wherein 150 parts by weight of polydimethylsiloxane in the step 3) is heated to 120 ℃ and cured for 30 min.

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