Method for constructing ultra-high-durability super-hydrophobic metal net based on ultrafast laser and application of ultra-high-durability super-hydrophobic metal net

Abstract

The invention discloses a method for constructing an ultrahigh-durability super-hydrophobic metal net based on ultrafast laser, which comprises the following steps: (1) proportionally mixing PDMS (Polydimethylsiloxane), a curing agent and CB (Carbon Black), and adding into a mold to obtain a CB-PDMS mixture; pouring the mixture into a polytetrafluoroethylene mold; (2) cleaning a metal net with absolute ethyl alcohol, putting the metal net on the surface of the CB-PDMS mixture, putting the metal net and the CB-PDMS mixture into a drying box, curing CB-PDMS, and stripping the cured CB-PDMS attached with the metal net from the mold to obtain a coupling substrate sample of the CB-PDMS and the metal net; and (3) finally, carrying out ultrafast laser processing on the coupling substrate sample of the CB-PDMS and the metal net, stripping the metal net from the CB-PDMS, and blowing off the surface of the metal net with nitrogen to obtain the super-hydrophobic metal net. The super-hydrophobic metal net has the excellent photothermal effect, the surface temperature of the metal net rises to 93.5 DEG C after 120 s under irradiation of 0.1 W / cm < 2 > sunlight, the super-hydrophobic metal net can be used as an anti-icing protection layer of power transmission lines, cables and the like, the anti-icing and deicing effects are remarkable, and the super-hydrophobic metal net has the market popularization value.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering materials, and in particular to a method for constructing an ultra-high durability super-hydrophobic metal mesh based on an ultrafast laser and an application thereof. Background Art

[0002] Superhydrophobic materials have attracted more and more attention due to their unique wettability. Inspired by nature, superhydrophobic applications are becoming more and more widespread. Superhydrophobic materials have a wide range of applications, such as self-cleaning, oil-water separation, corrosion resistance, lossless liquid transfer, anti-fog, anti-icing and other functions. There are generally two directions for the preparation of superhydrophobicity. One is to construct a multi-level micro-nano rough structure on the surface of an object, and the other is to use low surface energy materials to modify the interface. Among them, the micro-nano rough structure is easy to collapse or break under the action of mechanical load, resulting in hydrophobic failure.

[0003] At present, the research methods for improving the mechanical stability of superhydrophobic micro-nano structures can be roughly divided into three categories: 1) adding binders to the coating; 2) increasing the coating thickness; 3) constructing a micro-nano dual-scale array structure. These methods all have their limitations and shortcomings, such as: the binder will increase the surface energy and thus reduce the surface hydrophobicity; after the outer layer structure is sacrificed due to wear to a certain extent, the similar structure of the inner layer is exposed, which reduces the hydrophobicity; the preparation cost is high, the process is complex, and it takes a long time; the chemical synthesis method has a large environmental pollution. In addition, the durability of existing superhydrophobic materials in high temperature environments and acid and alkaline environments is also unsatisfactory, making it difficult to achieve large-scale application in industry and daily life.

[0004] In addition, ice is a natural phenomenon. While it brings people beautiful scenery and joyful ice and snow sports, it can also cause loss of life and property. Icing on roads causes traffic accidents and casualties. Ice accumulation on transmission lines causes the power system to not operate normally. Ice accumulation on aircraft fuselages can disrupt airflow on the aircraft and other surfaces, reduce lift, increase drag, and bring risks to flight. When a large amount of ice accumulates on the surface of wind turbine blades, the unbalanced load of the unit increases, reducing the wind energy utilization coefficient of the unit, thereby causing a decrease in power generation. In severe cases, it can also cause the wind turbine to fail to start normally. Operating on the solid surface to make it have a super-hydrophobic and anti-icing micro-nano structure can further solve the ice accumulation problem. This is an environmentally friendly, economical, and efficient anti-icing and de-icing method.

[0005] In view of this, it is very necessary to propose a super-hydrophobic micro-nanostructure manufacturing process based on ultrafast laser with high mechanical durability, non-toxicity, environmentally friendly, simple and fast to solve or at least alleviate the above defects. Summary of the invention

[0006] In view of the problem of poor mechanical stability and durability of super-hydrophobic micro-nano structures, the present invention aims to provide a method for preparing a simple, non-toxic, and highly adaptable wear-resistant super-hydrophobic metal mesh.

[0007] To achieve the above object, the present invention provides the following technical solution: a method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser, comprising the following steps:

[0008] (1) PDMS, curing agent and CB are mixed in proportion, added into a mold to obtain a CB-PDMS mixture, and then poured into a polytetrafluoroethylene mold;

[0009] (2) placing the cleaned and dried metal mesh on the surface of the CB-PDMS mixture, drying and curing it with a bellows, and then peeling the cured CB-PDMS attached to the metal mesh from the mold to obtain a coupling substrate sample of CB-PDMS and the metal mesh;

[0010] (3) Finally, after the sample of CB-PDMS coupled with the metal mesh is processed by ultrafast laser, the metal mesh is peeled off from the solidified CB-PDMS, and the surface of the metal mesh is blown clean with nitrogen to obtain a superhydrophobic metal mesh.

[0011] Preferably, the mass ratio of the PDMS, curing agent and CB is 10:0.8-1.2:0.3-1.

[0012] Preferably, the curing agent is Sylgard184.

[0013] Preferably, the specific steps of the ultrafast laser processing are to fix the sample on a laser galvanometer, set the laser focal length on the sample surface, and the laser processing route is to first perform a reciprocating linear sweep along the X-axis direction and then perform a reciprocating linear sweep along the Y-axis direction.

[0014] Preferably, the processing parameters of the ultrafast laser are: central wavelength of 10.6 μm, power of 50 W, spot diameter focused on the sample surface of 100 μm, scanning speed of 20-100 mm / s, and scanning interval of 20-50 μm.

[0015] Preferably, the specific conditions for the bellows drying and curing are drying at 70-90°C for 12-20 minutes.

[0016] Preferably, in step (2), the metal mesh is ultrasonically cleaned and dried using ethanol.

[0017] Preferably, the metal mesh is one of stainless steel mesh, copper mesh, titanium mesh, molybdenum mesh, aluminum mesh or nickel mesh.

[0018] Preferably, the mesh size of the metal mesh is 60 mesh, 80 mesh, 100 mesh, 120 mesh, 160 mesh or 200 mesh.

[0019] Preferably, the ultra-high durability super-hydrophobic metal mesh is applied to an anti-icing protective layer of a power transmission line or cable.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention adjusts the power parameters, repetition frequency, pulse number and scanning speed of the ultrafast laser, and uses ultrafast laser to ablate the metal mesh to form a micro-nano structure on the coupling structure of the metal mesh, PDMS and carbon black, while molten and vaporized PDMS is splashed and deposited, thereby preparing a coral-like superhydrophobic micro-nano structure, thereby achieving superwettability modification of the porous mesh membrane.

[0022] (2) The present invention constructs an ultra-high durability micro-nano structure based on ultrafast laser processing. The whole process does not use toxic reagents and organic solvents, and the wetting modification of the metal mesh is achieved. The large-scale micron structure protects the submicron and nanoscale coral structures. The super-hydrophobic structure is subjected to severe indoor and outdoor wear cycle experiments. ① Using a rotating friction tester, the super-hydrophobic metal mesh is placed under a 40Cr friction head, with a constant pressure of 3N and a rotating friction of 500m, and still exhibits excellent super-hydrophobic and self-cleaning capabilities (the contact angle is not less than 154°, and the rolling angle is not higher than 7°). ② Use 800-mesh sandpaper as the wear surface, place the super-hydrophobic metal mesh on the sandpaper surface, and apply a load of 500 grams (12.25KP) to move the super-hydrophobic metal mesh on the sandpaper in the horizontal and vertical directions (10 cm in each direction, 20 cm as a cycle) to carry out a linear wear test. After 500 cycles, it still exhibits excellent hydrophobicity (contact angle of 159°, rolling angle of 3°) and self-cleaning ability.

[0023] (3) The present invention uses PDMS and its curing agent as raw materials, and is formed based on ultrafast laser one-step processing. It is non-toxic, environmentally friendly and pollution-free, and is suitable for oil-water separation and surface anti-icing and self-cleaning applications. It has high-temperature stability and its hydrophobicity remains unchanged when it is exposed to a high temperature environment of 400°C for a long time. It has high acid and alkali resistance and its hydrophobicity remains unchanged when it is exposed to a strong acid and alkali environment of pH 1 and 14 for a long time.

[0024] (4) The super-hydrophobic metal mesh of the present invention has photothermal deicing and anti-icing properties due to the photothermal properties of carbon black, and can be used as an anti-icing protective layer for transmission lines, cables, etc. It has significant anti-icing and deicing effects and has market promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a technical experiment schematic diagram of the ultrafast laser of the present invention;

[0026] Figure 2 1 is a comparison diagram of the optical morphology of the original metal mesh and the super-hydrophobic metal mesh of the present invention;

[0027] Figure 3 The light-heat effect versus temperature cloud diagram of the present invention; at 0.1W / cm 2 Under the sunlight, the surface temperature of the metal mesh rose to 93.5℃ after 120s.

[0028] Figure 4 The scanning electron microscope image and contact angle measurement image of the original metal mesh, wherein 4-1 is the scanning electron microscope image of the original metal mesh, and 4-2 is the contact angle measurement image of the original metal mesh;

[0029] Figure 5 5-1 is a scanning electron microscope image of a side-view state of a super-hydrophobic metal mesh structure of the present invention; 5-2 is a partial enlarged view of 5-1; 5-3 is a scanning electron microscope image of a top-view state; Figure 5-4 5-5 is a partial enlarged view of 5-3;

[0030] Figure 6 This is a contact angle measurement diagram of the super-hydrophobic structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the friction and wear experiment of the present invention;

[0032] Figure 8 These are scanning electron microscope images and contact angle measurement images of the super-hydrophobic metal mesh of the present invention after being worn for 500 m, wherein 8-1 is a scanning electron microscope image, 8-2 is a local enlarged image of 8-1, and 8-3 is a contact angle measurement image after wear; 8-4 is a contact angle measurement image after 100 cycles of sandpaper wear.

[0033] Fig. 9 This is a diagram showing the anti-icing experimental effect of the super-hydrophobic metal mesh of the present invention.

[0034] Fig.10 This is a corrosion resistance test diagram of the super hydrophobic metal mesh of the present invention.

[0035] Fig.11 It is a schematic diagram of the anti-icing application of the super-hydrophobic metal mesh of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] PDMS in the present invention refers to polydimethylsiloxane; CB refers to carbon black; and the curing agent Sylgard 184 is Dow Corning Sylgard 184, purchased from Shanghai Enlaibao Trading Co., Ltd.

[0038] Example 1

[0039] like Figure 1 As shown, a method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser comprises the following steps:

[0040] (1) Sample pretreatment: After smoothing a 5 cm × 5 cm, 80-mesh metal mesh (stainless steel mesh, copper mesh, titanium mesh, molybdenum mesh, aluminum mesh or nickel mesh), ultrasonically clean it with anhydrous ethanol at room temperature for 20 min, and blow dry it with nitrogen; then mix 3 g of PDMS with 0.3 g of curing agent, add 0.2 g of carbon black, stir evenly with a glass rod, let it stand to remove bubbles, pour it into a polytetrafluoroethylene mold with a size of 5 cm × 5 cm × 1 mm and let it stand to flatten; then gently place the metal mesh in the mold with CB-PDMS, ensuring that the metal mesh is always on the surface of the CB-PDMS solution, and then put it into a bellows to dry at 80°C for 15 min. Finally, peel off the coupled metal mesh and the cured CB-PDMS together to obtain a metal mesh polymer-metal mesh coupling sample;

[0041] (2) Figure 1 As shown, the sample is fixed on a laser galvanometer processing platform, which includes an ultrafast laser 1, a light emitting diode 2, a laser beam 3 and a positioning platform 4. During the test, the super-hydrophobic iron mesh sample is placed on a laser beam emitted by a laser laser (i.e., ultra-fast laser 1). The laser beam passes through the light emitting diode 2, and the focal length is fixed on the surface of the super-hydrophobic iron mesh sample on the positioning platform 4.

[0042] The laser processing route is to first make a straight line sweep along the X-axis direction, and then make a straight line sweep along the Y-axis direction; during the laser ablation process, the formation of the metal mesh structure is synchronized with the melt adhesion and vaporization deposition process of the solidified PDMS reactant; ultrafast laser processing parameters: central wavelength is 10.6m, power is 50W, the spot diameter focused on the sample surface is 100um, the scanning speed is 50mm / s, and the scanning interval is 30um; during the processing sweep, the dust removal machine needs to be turned off to allow the reactants to be better deposited in the microstructure; after the processing, the obtained sample can directly peel off the metal mesh from the solidified PDMS, and blow the metal mesh surface with nitrogen to obtain a super-hydrophobic metal mesh with ultra-high durability. Among them, the processing path and scanning speed of the ultrafast laser are drawn and set by Ezcad software.

[0043] In the present invention, PDMS is polydimethylsiloxane, and its molecular formula is (C2H6OSi)n, also known as dimethyl silicone oil. Under the action of ultrafast laser, the reaction formula for the high-temperature decomposition of PDMS is as follows:

[0044]

[0045] Ultrafast laser action causes thermal decomposition of PDMS, generating low surface energy silyl methyl oligomers and hydrophobic silica. During the thermal decomposition of PDMS, the curing agent Sylgard184 promotes the cross-linking reaction between PDMS molecular chains to form a three-dimensional network structure. This cross-linking is a key step in the transformation of PDMS from liquid to solid. At the same time, the curing agent Sylgard184 also has the function of accelerating the transformation of PDMS from liquid to solid. CB has photothermal properties. Under the coupling effect of CB, PDMS and iron mesh, the super-hydrophobic iron mesh has photothermal deicing and anti-icing properties. Ultrafast laser ablation of the metal mesh is used on the coupling structure of the metal mesh, PDMS and carbon black to form a micro-nano structure and splash deposition of molten PDMS. The thermal decomposition products of the molten PDMS are directly coated on the surface of the super-hydrophobic metal mesh to achieve super-hydrophobic modification of the metal mesh.

[0046] The super hydrophobic iron mesh prepared in Example 1 was subjected to relevant performance tests.

[0047] (1) Comparison of optical morphology and scanning electron microscope images. Figure 2 , Figure 3 The specific morphology of the sample in this embodiment can be seen. When water drops are dropped on the metal mesh, Figure 2 On the left, we can see that water drops on the original iron mesh will instantly soak the iron mesh, but Figure 2 On the right side, it can be seen that the water droplets are in a super-hydrophobic state on the super-hydrophobic iron mesh treated by the present invention. Figure 3 It can be seen that at 0.1W / cm 2 Under the sunlight, the surface temperature of the metal mesh rose to 93.5℃ after 120s. It can be seen that the super hydrophobic iron mesh has the characteristics of photothermal deicing and anti-icing. Figure 4 and Figure 5 Scanning electron microscope images show the microstructure of the original metal mesh and the microstructure of the super-hydrophobic metal mesh of the present invention. Figure 5 5-1 is a scanning electron microscope image of a side view, 5-2 is a partial enlarged view of 5-1, and 5-3 is a scanning electron microscope image of a top view. Figure 5-4 5-5 is a local enlarged view of 5-3; from the scanning electron microscope image, it can be seen that the structure of the superhydrophobic iron mesh after treatment is fluffier and rougher, and it can be clearly seen that the superhydrophobic iron mesh after treatment has a superhydrophobic micro-nano structure.

[0048] (2) Wettability test: The prepared super-hydrophobic metal mesh was tested for its wettability parameters by using a contact angle meter. Figure 6 As shown, the water contact angle of the treated and modified metal mesh is 164°, while the water contact angle of the untreated and modified metal mesh is 109° (see Figure 4 4-2), it can be seen that the metal mesh treated by the present invention has super hydrophobic properties.

[0049] (3) Wear resistance test. The super hydrophobic metal mesh prepared in this example was subjected to a wear resistance test. The test equipment is as follows: Figure 7 As shown. The wear resistance test is to use a load of 3N on a Cr40 friction head to make the super-hydrophobic metal mesh go through a 500m wear cycle, and then detect the wear degree and super-hydrophobic performance of the super-hydrophobic metal mesh; specifically: ① Using a rotating friction tester, the super-hydrophobic metal mesh is placed under a 40Cr friction head, with a constant pressure of 3N, and rotated for 500m, and still shows excellent super-hydrophobic and self-cleaning ability (contact angle is not less than 154°, and rolling angle is not higher than 7°). ② Using 800-mesh sandpaper as the wear surface, the super-hydrophobic metal mesh is placed on the sandpaper surface, and a load of 500 grams (12.25KP) is applied to move the super-hydrophobic metal mesh in the horizontal and vertical directions on the sandpaper (10cm in each direction, 20cm as a cycle), and a linear wear test is carried out. After 500 cycles, it still shows excellent hydrophobicity (contact angle is 159°, rolling angle is 3°) and self-cleaning ability.

[0050] like Figure 8 It can be seen that after the wear resistance test, the microstructure of the super-hydrophobic metal mesh is only slightly worn, which does not affect the maintenance of the hydrophobic performance. Figure 8-3 , the contact angle of the super-hydrophobic metal mesh after wear is 154°. It can be seen that after the wear test, the hydrophobic performance and self-cleaning performance of the super-hydrophobic metal mesh of this embodiment remain unchanged, and it has ultra-high durability.

[0051] (4) High temperature stability test: The super-hydrophobic metal mesh prepared in Example 1 was placed in a 400° C. environment (such as a heating platform) for 4-5 hours, and then taken out to test the hydrophobicity of the super-hydrophobic metal mesh.

[0052] It can be seen from the experiment that the super hydrophobic metal mesh of this embodiment has high temperature stability and its hydrophobicity remains unchanged in a high temperature environment of 400° C. for a long time.

[0053] (5) Acid and alkali corrosion resistance test. The super-hydrophobic metal mesh prepared in Example 1 was immersed in a sulfuric acid solution with a pH of 1 for 1 hour, and the sulfuric acid solution on the surface was washed after being taken out, and the hydrophobicity of the super-hydrophobic metal mesh after immersion was tested; the super-hydrophobic metal mesh prepared in Example 1 was immersed in a sodium hydroxide solution with a pH of 14 for 1 hour, and the sodium hydroxide solution on the surface was washed after being taken out, and the hydrophobicity of the super-hydrophobic metal mesh after immersion was tested.

[0054] like Fig.10 The figure shows the corrosion resistance test of the super hydrophobic metal mesh of the present invention. Fig.10 It can be seen that the super-hydrophobic metal mesh prepared in this embodiment has high acid and alkali resistance, and its hydrophobicity remains unchanged when it is placed in a strong acid and alkali environment with a pH of 1 and 14 for a long time.

[0055] (6) Photothermal deicing effect test. The super hydrophobic metal mesh prepared in this example was subjected to a photothermal deicing effect test. The ambient temperature was 25°C, the freezing platform temperature was set to -15°C, a 30uL droplet was placed on the surface of the super hydrophobic iron mesh to start the freezing platform, and the refrigeration temperature was set to -15°C. After the droplet was completely frozen, it was irradiated with a sun lamp and the temperature was measured with an infrared temperature gun. Fig. 9 As shown in the figure, the temperature changes of the super-hydrophobic iron mesh at 0s, 40s, 80s and 160s were -18.6℃, 25.2℃, 36.8℃ and 53.1℃ respectively, and the ice formed on the super-hydrophobic metal mesh gradually disappeared. Fig.11 This is a schematic diagram of the anti-icing application of the super-hydrophobic metal mesh of the present invention. It can be seen that the super-hydrophobic metal mesh of this embodiment is used on the outer layer of wires or cables to effectively perform photothermal deicing on the wires or cables.

[0056] The metal mesh of the present invention can be one of stainless steel mesh, copper mesh, titanium mesh, molybdenum mesh, aluminum mesh or nickel mesh; the mesh number of the metal mesh is 60 mesh, 80 mesh, 100 mesh, 120 mesh, 160 mesh or 200 mesh.

[0057] Example 2

[0058] The other process parameters of this embodiment are consistent with those of embodiment 1, except that: (1) Sample pretreatment: After the 5 cm × 5 cm, 80-mesh metal mesh is leveled, it is ultrasonically cleaned with anhydrous ethanol at room temperature for 20 min and blown dry with nitrogen; then 3 g of PDMS is mixed with 0.24 g of curing agent, and 0.09 g of carbon black is added. After stirring evenly with a glass rod, the mixture is allowed to stand to remove bubbles, and the mixture is poured into a polytetrafluoroethylene mold with a depth of 5 cm × 5 cm × 1 mm and allowed to stand to flatten.

[0059] The super-hydrophobic metal mesh obtained in Example 2 has a water contact angle of 158°, and the hydrophobicity and self-cleaning properties of the super-hydrophobic metal mesh remain unchanged after a 500-m wear cycle. The super-hydrophobic metal mesh prepared in this example is tested for photothermal deicing effect. From the test results, it can be seen that the super-hydrophobic metal mesh has an effective photothermal deicing effect on wires or cables.

[0060] Example 3

[0061] The other process parameters of this embodiment are consistent with those of embodiment 1, except that: (1) Sample pretreatment: After a 5 cm × 5 cm, 80-mesh metal mesh is leveled, it is ultrasonically cleaned with anhydrous ethanol at room temperature for 20 min and blown dry with nitrogen; then 3 g of PDMS is mixed with 0.36 g of a curing agent, and 0.3 g of carbon black is added. The mixture is stirred evenly with a glass rod and allowed to stand to remove bubbles. The mixture is then poured into a polytetrafluoroethylene mold with a depth of 5 cm × 5 cm × 1 mm and allowed to stand to flatten.

[0062] The super-hydrophobic metal mesh obtained in Example 3 has a water contact angle of 160°, so that after the super-hydrophobic metal mesh has been worn for 500 m, its hydrophobicity and self-cleaning properties remain unchanged. The super-hydrophobic metal mesh prepared in this example is tested for the photothermal deicing effect. From the test results, it can be seen that the super-hydrophobic metal mesh has an effective photothermal deicing effect.

[0063] The present invention constructs a coral-like super-hydrophobic structure by adjusting the scanning speed and scanning power in the laser (i.e., ultrafast laser) preparation parameters using laser ablation. The mechanism of its mechanical durability is that by constructing a micron-level solid groove structure, the internal micro-nano hierarchical structure and the deposited CB-PDMS post-reaction hydrophobic material can be well protected, and with the help of the photothermal effect of CB, the function of surface anti-icing and de-icing is realized by using clean energy-solar energy.

[0064] Example 4

[0065] The other process parameters of this embodiment are consistent with those of embodiment 1, except that the processing parameters of the ultrafast laser are: central wavelength of 10.6m, power of 50W, spot diameter focused on the sample surface of 100um, scanning speed of 20mm / s, and scanning spacing of 20um.

[0066] The super-hydrophobic metal mesh obtained in Example 4 has a water contact angle of 164°, and the hydrophobicity and self-cleaning properties of the super-hydrophobic metal mesh remain unchanged after a 500m wear cycle. The super-hydrophobic metal mesh prepared in this example is subjected to a photothermal deicing effect test, and it can be seen from the test results that the super-hydrophobic metal mesh has an effective photothermal deicing effect.

[0067] Example 5

[0068] The other process parameters of this embodiment are consistent with those of embodiment 1. The difference is that: this embodiment is basically the same as embodiment 1, except that the processing parameters of the ultrafast laser are: the central wavelength is 10.6m, the power is 50W, the spot diameter focused on the sample surface is 100um, the scanning speed is 100mm / s, and the scanning spacing is 20um.

[0069] The super-hydrophobic metal mesh obtained in Example 5 has a water contact angle of 162°, and the hydrophobicity and self-cleaning properties of the super-hydrophobic metal mesh remain unchanged after a 500-m wear cycle. The super-hydrophobic metal mesh prepared in this example is tested for photothermal deicing effect. From the test results, it can be seen that the super-hydrophobic metal mesh has an effective photothermal deicing effect.

[0070] Comparative Example 1

[0071] This embodiment is substantially the same as embodiment 1, except that PDMS is not added when preparing the super-hydrophobic metal mesh.

[0072] Since PDMS was not used in Comparative Example 1, a super-hydrophobic metal mesh could not be obtained, and the metal mesh did not have super-hydrophobic properties.

[0073] Comparative Example 2

[0074] This embodiment is basically the same as Embodiment 1, except that no curing agent Sylgard 184 is added when preparing the super-hydrophobic metal mesh.

[0075] In Comparative Example 2, since the curing agent Sylgard 184 was not used, a super-hydrophobic iron mesh could not be obtained, and the iron mesh did not have super-hydrophobic properties.

[0076] Comparative Example 3

[0077] This embodiment is substantially the same as embodiment 1, except that CB is not added when preparing the super-hydrophobic metal mesh.

[0078] The super-hydrophobic metal mesh obtained in Comparative Example 3 has a water contact angle of 155°, so that the hydrophobic performance and self-cleaning performance of the super-hydrophobic metal mesh remain unchanged after a wear cycle of 500 m. The super-hydrophobic metal mesh prepared in this embodiment is tested for photothermal deicing effect. From the test results, it can be seen that the super-hydrophobic metal mesh does not have an effective photothermal deicing effect, because CB has photothermal properties. Under the coupling effect of CB, PDMS and metal mesh, the prepared super-hydrophobic metal mesh has photothermal deicing and anti-icing properties.

[0079] Comparative Example 4

[0080] This embodiment is basically the same as the embodiment 1, except that when preparing the super-hydrophobic metal mesh, the laser processing route is to perform a reciprocating linear sweep only along the X-axis direction, and no reciprocating linear sweep is performed along the Y-axis direction.

[0081] The water contact angle of the super-hydrophobic metal mesh obtained in Comparative Example 4 is 145°. Since only a straight line sweep in the X-axis direction is performed, the micron-level roughness and nano-level roughness of the micro-nanostructure of the super-hydrophobic metal mesh obtained are slightly reduced. After the super-hydrophobic metal mesh has been subjected to a wear cycle of 500 m, its hydrophobicity and self-cleaning performance are also reduced.

[0082] Comparative Example 5

[0083] This embodiment is basically the same as the embodiment 1, except that when preparing the super-hydrophobic metal mesh, the laser processing route is to perform a reciprocating linear sweep only along the Y-axis direction, and no reciprocating linear sweep is performed along the X-axis direction.

[0084] The water contact angle of the super-hydrophobic metal mesh obtained in Comparative Example 5 is 148°, because only a straight line sweep in the Y-axis direction is performed, the micron-level roughness and nano-level roughness of the micro-nanostructure of the super-hydrophobic metal mesh obtained are slightly reduced. After the super-hydrophobic metal mesh is subjected to a wear cycle of 500 m, its hydrophobicity and self-cleaning performance are also reduced.

[0085] The present invention prepares a novel micro-nano structure by using ultrafast laser ablation of the metal mesh to form a micro-nano structure and splash deposition of molten PDMS on the coupling structure of the metal mesh, PDMS and carbon black, thereby realizing super-wettability modification of the porous grid. The obtained super-hydrophobic metal mesh with the micro-nano structure has ultra-durable hydrophobic properties and self-cleaning ability, has significant anti-icing and de-icing effects, and has market promotion value.

[0086] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser, characterized in that: The following steps are involved: (1) PDMS, curing agent and CB are mixed in proportion, added into a mold to obtain a CB-PDMS mixture, and then poured into a polytetrafluoroethylene mold; (2) placing the cleaned and dried metal mesh on the surface of the CB-PDMS mixture, drying and curing it with a bellows, and then peeling the cured CB-PDMS attached to the metal mesh from the mold to obtain a coupling substrate sample of CB-PDMS and the metal mesh; (3) Finally, after ultrafast laser processing of the coupling substrate sample of CB-PDMS and the metal mesh, the metal mesh is peeled off from the solidified CB-PDMS, and the surface of the metal mesh is blown clean with nitrogen to obtain a superhydrophobic metal mesh.

2. The method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser according to claim 1, characterized in that: The mass ratio of the PDMS, curing agent and CB is 10:0.8-1.2:0.3-1.

3. The method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser according to claim 2, characterized in that: The curing agent is Sylgard184.

4. The method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser according to claim 1, characterized in that: The specific steps of the ultrafast laser processing are to fix the sample on the laser galvanometer, set the laser focal length on the sample surface, and the laser processing route is to first perform a reciprocating linear sweep along the X-axis direction and then perform a reciprocating linear sweep along the Y-axis direction.

5. The method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser according to claim 4, characterized in that: The processing parameters of the ultrafast laser are: central wavelength of 10.6 μm, power of 50 W, spot diameter focused on the sample surface of 100 μm, scanning speed of 20-100 mm / s, and scanning interval of 20-50 μm.

6. The method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser according to claim 1, characterized in that: The specific conditions of the bellows drying and curing are drying at 70-90° C. for 12-20 minutes.

7. The method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser according to claim 1, characterized in that: In step (2), the metal mesh is ultrasonically cleaned and dried using ethanol.

8. The method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser according to claim 1, characterized in that: The metal mesh is one of a stainless steel mesh, a copper mesh, a titanium mesh, a molybdenum mesh, an aluminum mesh or a nickel mesh.

9. The method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser according to claim 8, characterized in that: The mesh number of the metal mesh is 60 mesh, 80 mesh, 100 mesh, 120 mesh, 160 mesh or 200 mesh.

10. Application of the method for constructing an ultra-high durability super-hydrophobic metal mesh based on ultrafast laser according to any one of claims 1 to 9, characterized in that: The ultra-high durability super-hydrophobic metal mesh is applied to an anti-icing protective layer of a transmission line or cable.

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