Nitride-filled polymer-based flexible super-hydrophobic material and preparation method thereof

Abstract

The invention discloses a nitride-filled polymer-based flexible super-hydrophobic material and a preparation method thereof, and belongs to the technical field of flexible super-hydrophobic materials, the nitride-filled polymer-based flexible super-hydrophobic material comprises a PDMS prepolymer, a curing agent, nano aluminum nitride particles and micron boron nitride particles, the mass ratio of the PDMS prepolymer to the curing agent is (10-40): 1, and the mass ratio of the nano aluminum nitride particles to the micron boron nitride particles is (10-40): 1. The nano aluminum nitride particles and the micron boron nitride particles account for 5-20% of the mass of the PDMS prepolymer. Wherein the nanometer aluminum nitride particles and the micrometer boron nitride particles are mixed according to the ratio of 1: 1-9: 1; nanometer nitride particles and PDMS are mixed to prepare a flexible super-hydrophobic material, then the flexible super-hydrophobic material is processed through optical fiber laser direct writing, and the nitride-filled polymer-based flexible super-hydrophobic material is obtained. The prepared super-hydrophobic material is high in self-cleaning capacity and good in flexibility.

Description

Technical Field

[0001] This invention relates to the field of flexible superhydrophobic materials technology, and more particularly to a nitride-filled polymer-based flexible superhydrophobic material, and a method for preparing the nitride-filled polymer-based flexible superhydrophobic material. Background Technology

[0002] Superhydrophobicity is widespread in nature. Many plant surfaces have high hydrophobicity and self-cleaning properties, such as the surfaces of lotus leaves and rice leaves. Superhydrophobicity refers to significant hydrophobicity, desorption, anti-sticking, and self-cleaning functions. Based on the degree of water wetting on a solid surface, solid surfaces can be divided into hydrophilic surfaces and hydrophobic surfaces. Generally, the stable contact angle of a superhydrophobic material surface is defined to be greater than 150°.

[0003] Unlike rigid superhydrophobic materials, flexible superhydrophobic materials can withstand certain deformations and maintain their superhydrophobic state due to their unique flexibility. Polydimethylsiloxane (PDMS) is widely used in flexible electronics, microfluidic chips, and other fields due to its excellent flexibility, insulation, and chemical stability. Current fabrication methods include photolithography, laser etching, and spraying. Photolithography requires expensive equipment and involves a complex process. Spraying involves coating the superhydrophobic material onto a substrate to form a superhydrophobic coating; however, the resulting superhydrophobic surface suffers from poor durability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a nitride-filled polymer-based flexible superhydrophobic material and its preparation method, wherein the prepared superhydrophobic material has strong self-cleaning ability and good flexibility.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following solution: a nitride-filled polymer-based flexible superhydrophobic material, comprising PDMS prepolymer, curing agent, nano-aluminum nitride particles and micron-sized boron nitride particles, wherein the mass ratio of PDMS prepolymer to curing agent is 10-40:1, the nitride accounts for 5%-20% of the mass of PDMS prepolymer, and the nano-aluminum nitride particles and micron-sized boron nitride particles are mixed in a ratio of 1:1-9:1.

[0006] Furthermore, the particle size of the aforementioned nano-aluminum nitride particles is 30-60 nm, and the particle size of the micron-sized boron nitride particles is 5-20 μm.

[0007] A method for preparing a nitride-filled polymer-based flexible superhydrophobic material, the method comprising the following steps:

[0008] Step 1: Mix the PDMS prepolymer and curing agent in a set ratio and stir magnetically for 5-30 minutes to obtain sol A;

[0009] Step 2: Add nano-aluminum nitride particles and micron-sized boron nitride particles to sol A from step 1, and stir magnetically for 30-60 minutes to obtain sol B;

[0010] Step 3: Pour the sol B from step 2 evenly onto the PTFE mold and place it in a vacuum drying oven for 20-90 minutes. Then, heat it to 60-100℃ and dry it for 100-240 minutes. After that, peel the material out of the PTFE mold to obtain a flexible superhydrophobic material.

[0011] Step 4: Use fiber laser to etch the flexible superhydrophobic material obtained in step 3.

[0012] Furthermore, the laser etching method in step 4 above is line scanning.

[0013] Furthermore, the parameters for the above-mentioned line scanning are: 1-15 scans, laser power of 12.5-22.5w, scanning speed of 100-1400mm / s, and line spacing of 10-100μm.

[0014] Compared with the prior art, the advantages of the present invention are as follows:

[0015] 1) In the superhydrophobic flexible material prepared by the formulation of this invention, a flexible PDMS prepolymer serves as the superhydrophobic substrate, and nitride composed of nano-aluminum nitride particles and micron-sized boron nitride particles is added to construct a micro-nano structure, so that the nitride / PDMS ratio achieves superhydrophobicity. Flexible superhydrophobicity means that it can be deformed, bent and stretched. While ensuring flexibility, the optimal nitride particle concentration, nitride mixing ratio, and curing agent ratio are selected, because the increase of nitride particle concentration, nitride, and curing agent will also affect the flexibility of the superhydrophobic material. The superhydrophobic material prepared by this invention has strong self-cleaning ability and good flexibility. The aluminum nitride and boron nitride cores are electrically insulating and have better thermal conductivity than titanium nitride. Moreover, the advantage of the titanium nitride core is photothermal conversion, which is not required in this application.

[0016] 2) This invention has the advantages of simple preparation process, convenient operation, and mild reaction conditions. The prepared superhydrophobic material also exhibits strong self-cleaning ability and good flexibility. Compared to the expensive equipment and complex preparation process required by photolithography, this invention uses laser etching, which reduces equipment costs and simplifies the preparation process.

[0017] 3) The flexible superhydrophobic material of the present invention is based on chemically inert PDMS polymer, and therefore has good acid and alkali chemical stability. Attached Figure Description

[0018] Figure 1The images show the SEM morphology of the superhydrophobic materials obtained in Examples 1, 2, 3, and 4; Examples 1, 2, 3, and 4 correspond to a, b, c, and d in the figures, respectively.

[0019] Figure 2 The image shows the state of droplets that still exhibit an approximately spherical shape under different degrees of deformation of the flexible superhydrophobic material prepared in Example 1.

[0020] Figure 3 The diagram shows the state of the flexible superhydrophobic material prepared in Example 1 and the anti-fouling test of various droplets on its surface.

[0021] Figure 4 Acid-base test curves were obtained for the flexible superhydrophobic material prepared in Example 1. Detailed Implementation

[0022] The present invention will now be described in detail with reference to specific embodiments.

[0023] Example 1: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0024] The specific preparation method for 10g of PDMS prepolymer, 1g of curing agent, 1.05g of nano-aluminum nitride particles and 0.45g of micron-sized boron nitride particles is as follows:

[0025] Step 1: Mix the PDMS prepolymer with the curing agent and stir magnetically for 15 minutes to obtain sol A;

[0026] Step 2: Add nano-aluminum nitride particles and micron-sized boron nitride particles to sol A, and stir magnetically for 40 minutes to obtain sol B;

[0027] Step 3: Pour sol B evenly onto the PTFE mold and place it in a vacuum drying oven for 60 minutes. Then, heat it to 90°C and cure it for 150 minutes. After that, peel the material out of the PTFE mold to obtain a flexible superhydrophobic material.

[0028] Step 4: Use fiber laser to etch the flexible superhydrophobic material obtained in step 3. Fiber laser etching uses a program to control the laser scanning path to etch the nitride-filled polymer-based flexible material. The laser parameters used during etching are: laser power of 15W, processing speed of 200mm / s, line spacing of 30μm, and processing is performed 3 times to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0029] Example 2: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0030] The specific preparation method for 10g of PDMS prepolymer, 1g of curing agent, 0.35g of nano-aluminum nitride particles, and 0.15g of micron-sized boron nitride particles is as follows:

[0031] Step 1: Mix the PDMS prepolymer with the curing agent and stir magnetically for 15 minutes to obtain sol A;

[0032] Step 2: Add nano-aluminum nitride particles and micron-sized boron nitride particles to sol A, and stir magnetically for 40 minutes to obtain sol B;

[0033] Step 3: Pour sol B evenly onto the PTFE mold and place it in a vacuum drying oven for 60 minutes. Then, heat it to 90°C and cure it for 150 minutes. After that, peel the material out of the PTFE mold to obtain a flexible superhydrophobic material.

[0034] Step 4: Use fiber laser to etch the flexible superhydrophobic material obtained in step 3. Fiber laser etching uses a program to control the laser scanning path to etch the nitride-filled polymer-based flexible material. The laser parameters used during etching are: laser power of 15W, processing speed of 200mm / s, line spacing of 30μm, and processing is performed 3 times to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0035] Example 3: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0036] The specific preparation method for 10g of PDMS prepolymer, 1g of curing agent, 0.7g of nano-aluminum nitride particles, and 0.3g of micron-sized boron nitride particles is as follows:

[0037] Step 1: Mix the PDMS prepolymer with the curing agent and stir magnetically for 15 minutes to obtain sol A;

[0038] Step 2: Add nano-aluminum nitride particles and micron-sized boron nitride particles to sol A, and stir magnetically for 40 minutes to obtain sol B;

[0039] Step 3: Pour sol B evenly onto the PTFE mold and place it in a vacuum drying oven for 60 minutes. Then, heat it to 90°C and cure it for 150 minutes. After that, peel the material out of the PTFE mold to obtain a flexible superhydrophobic material.

[0040] Step 4: Use fiber laser to etch the flexible superhydrophobic material obtained in step 3. Fiber laser etching uses a program to control the laser scanning path to etch the nitride-filled polymer-based flexible material. The laser parameters used during etching are: laser power of 15W, processing speed of 200mm / s, line spacing of 30μm, and processing is performed 3 times to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0041] Example 4: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0042] The specific preparation method for 10g of PDMS prepolymer, 1g of curing agent, 1.4g of nano-aluminum nitride particles, and 0.6g of micron-sized boron nitride particles is as follows:

[0043] Step 1: Mix the PDMS prepolymer with the curing agent and stir magnetically for 15 minutes to obtain sol A;

[0044] Step 2: Add nano-aluminum nitride particles and micron-sized boron nitride particles to sol A, and stir magnetically for 40 minutes to obtain sol B;

[0045] Step 3: Pour sol B evenly onto the PTFE mold and place it in a vacuum drying oven for 60 minutes. Then, heat it to 90°C and cure it for 150 minutes. After that, peel the material out of the PTFE mold to obtain a flexible superhydrophobic material.

[0046] Step 4: Use fiber laser to etch the flexible superhydrophobic material obtained in step 3. Fiber laser etching uses a program to control the laser scanning path to etch the nitride-filled polymer-based flexible material. The laser parameters used during etching are: laser power of 15W, processing speed of 200mm / s, line spacing of 30μm, and processing is performed 3 times to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0047] Example 5: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0048] 10g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 1.35g of nano-aluminum nitride particles and 0.15g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 15w, processing speed of 200mm / s, line spacing of 30μm, and three processing passes to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0049] Example 6: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0050] 10g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 1.2g of nano-aluminum nitride particles and 0.3g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 15w, processing speed of 200mm / s, line spacing of 30μm, and three processing passes to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0051] Example 7: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0052] 10g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 0.9g of nano-aluminum nitride particles and 0.6g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 15w, processing speed of 200mm / s, line spacing of 30μm, and three processing passes to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0053] Example 8: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0054] 10g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 0.75g of nano-aluminum nitride particles and 0.75g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 15w, processing speed of 200mm / s, line spacing of 30μm, and three processing passes to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0055] Example 9: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0056] 20g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 2.1g of nano-aluminum nitride particles and 0.9g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 15w, processing speed of 200mm / s, line spacing of 30μm, and three processing passes to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0057] Example 10: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0058] 25g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 2.625g of nano-aluminum nitride particles and 1.125g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 15w, processing speed of 200mm / s, line spacing of 30μm, and three processing passes to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0059] Example 11: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0060] 30g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 3.15g of nano-aluminum nitride particles and 1.35g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 15w, processing speed of 200mm / s, line spacing of 30μm, and three processing passes to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0061] Example 12: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components by weight:

[0062] 40g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 4.2g of nano-aluminum nitride particles and 1.8g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 15w, processing speed of 200mm / s, line spacing of 30μm, and three processing passes to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0063] Comparative Example 1: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components in the indicated weight ratios:

[0064] 10g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 1.05g of nano-aluminum nitride particles and 0.45g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 12.5w, processing speed of 400mm / s, line spacing of 40μm, and processing was performed 4 times to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0065] Comparative Example 2: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components in the indicated weight ratios:

[0066] 10g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 1.05g of nano-aluminum nitride particles and 0.45g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 12.5w, processing speed of 600mm / s, line spacing of 60μm, and processing was performed 6 times to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0067] Comparative Example 3: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components in the indicated weight ratios:

[0068] 10g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 1.05g of nano-aluminum nitride particles and 0.45g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 12.5w, processing speed of 800mm / s, line spacing of 80μm, and 8 times, to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0069] Comparative Example 4: Nitride-filled polymer-based flexible superhydrophobic material, comprising the following components in the indicated weight ratios:

[0070] 10g of PDMS prepolymer was mixed with 1g of curing agent and magnetically stirred for 15min to obtain sol A. Then, 1.05g of nano-aluminum nitride particles and 0.45g of micron-sized boron nitride particles were added and magnetically stirred for 40min to obtain sol B. Sol B was poured evenly onto a PTFE mold and placed in a vacuum drying oven for 60min of vacuum treatment. Then, the temperature was raised to 90℃ and cured for 150min. The material was peeled off from the PTFE mold to obtain a flexible superhydrophobic material. The nitride-filled polymer-based flexible material was etched by controlling the laser scanning path through a program. The laser parameters used during etching were: laser power of 12.5w, processing speed of 1000mm / s, line spacing of 100μm, and 10 times to obtain the nitride-filled polymer-based flexible superhydrophobic material.

[0071] Tables 1-3 compare the contact angle parameters of Examples 1-12 and Comparisons of Examples 1 and Comparative Examples 1-4.

[0072] Table 1 Contact angles at different particle mixing ratios

[0073] As can be seen from Table 1, under different particle mixing ratios in Example 1 and Comparative Examples 5-7, the contact angle can reach 150°.

[0074] Table 2 Contact angles at different ratios of prepolymer to curing agent

[0075] As can be seen from Table 2, in both Example 1 and Comparative Examples 9-12, the contact angle can reach 150° even with different ratios of prepolymer to curing agent.

[0076] Table 3 Contact angle under different processing parameters

[0077] As can be seen from Table 3, under different processing parameters, the contact angles in Examples 1-4 did not exceed 150°, while the contact angle in Example 1 of this application reached 150°, satisfying the superhydrophobic condition.

[0078] Figure 1 As can be seen from the examples 1-4, after laser ablation, a micro-nano rough structure is formed on the substrate surface, which meets the prerequisite for superhydrophobicity.

[0079] Figure 2 The description states that even under tensile and bending conditions, the surface droplets of the superhydrophobic material prepared in this invention remain superhydrophobic.

[0080] Figure 3As can be seen, the polymer-based flexible superhydrophobic material of the present invention has good antifouling effect and good self-cleaning ability in different scenarios (tea, coffee, water and milk).

[0081] Figure 4 As can be seen, at pH=3 and 12, the surface of the superhydrophobic material of the present invention remains superhydrophobic after 300 minutes.

Claims

1. A nitride-filled polymer-based flexible superhydrophobic material, characterized in that, It includes PDMS prepolymer, curing agent, nano-aluminum nitride particles and micron-sized boron nitride particles. The mass ratio of PDMS prepolymer to curing agent is 10-40:1, and the nitride accounts for 5%-20% of the mass of PDMS prepolymer. The nano-aluminum nitride particles and micron-sized boron nitride particles are mixed in a ratio of 1:1-9:

1.

2. The nitride-filled polymer-based flexible superhydrophobic material according to claim 1, characterized in that, The particle size of nano-aluminum nitride particles is 30-60 nm, and the particle size of micron-sized boron nitride particles is 5-20 μm.

3. The method for preparing a nitride-filled polymer-based flexible superhydrophobic material according to claim 1, characterized in that, The method includes the following steps: Step 1: Mix the PDMS prepolymer and curing agent in a set ratio and stir magnetically for 5-30 minutes to obtain sol A; Step 2: Add nano-aluminum nitride particles and micron-sized boron nitride particles to sol A from step 1, and stir magnetically for 30-60 minutes to obtain sol B; Step 3: Pour the sol B from step 2 evenly onto the PTFE mold and place it in a vacuum drying oven for 20-90 minutes. Then, heat it to 60-100℃ and dry it for 100-240 minutes. After that, peel the material out of the PTFE mold to obtain a flexible superhydrophobic material. Step 4: Use fiber laser to etch the flexible superhydrophobic material obtained in step 3.

4. The nitride-filled polymer-based flexible superhydrophobic material according to claim 3, characterized in that, In step 4, the laser etching method is line scanning.

5. The nitride-filled polymer-based flexible superhydrophobic material according to claim 4, characterized in that, The parameters for line scanning are: 1-15 scans, 12.5-22.5W laser power, 100-1400mm / s scanning speed, and 10-100μm line spacing.

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