Method for repairing surface hydrophobicity of pipe and application

Abstract

The invention belongs to the technical field of tubular product hydrophobic surface modification, and particularly relates to a method for repairing tubular product surface hydrophobicity and application. The method comprises the following steps that S1, the surface of a to-be-repaired pipe is subjected to roughening treatment; s2, preparing a repairing solution; s3, uniformly coating the uncured repairing solution prepared in the step S2 on the surface of the to-be-repaired pipe treated in the step S1; s4, carrying out laser ablation on the surface of the pipe coated with the repairing solution, and carrying out melting interlacing reaction on PDMS and Ni powder coated on the surface of the pipe and a pipe material through laser ablation to form a super-hydrophobic surface; and S5, the surface of the pipe subjected to laser ablation in the step S4 is subjected to impurity removal treatment. According to the method, the repairing solution is directly brushed on the surface of the failed pipeline, laser ablation is conducted on the pipe brushed with the repairing solution, super-hydrophobic repairing of the surface of the pipe is achieved, repairing is easy, operation is convenient, the method is not prone to being limited by the environment, and the repaired hydrophobic surface has better hydrophobicity.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe hydrophobic surface modification, and specifically relates to a method for repairing the hydrophobicity of a pipe surface and an application thereof. Background Art

[0002] Pipes are everywhere in our lives, mainly for transporting liquids, gases, and some fluids with solid particles. However, as time goes by, the surface of the pipe will be corroded or fouled, and the surface performance will fail. Therefore, many methods have been developed to improve the performance of the pipe surface in order to increase the service life of the pipe. Inspired by nature, more and more bionic super-hydrophobic surfaces have been prepared and have shown important applications in practical fields such as self-cleaning, anti-fouling, anti-icing, and anti-scaling. Therefore, preparing a super-hydrophobic surface on the pipe surface is an extremely effective method.

[0003] However, because pipelines are used in natural environments, the super-hydrophobic surface is prone to failure as the pipeline medium is transported and the external environment affects it. Once a local failure occurs on the pipeline surface, the failure of the entire pipeline surface will be accelerated. At the same time, pipelines are generally fixed in a fixed position, so the failed pipeline is often replaced as a whole. Therefore, there is an urgent need for a method for repairing the hydrophobicity of the pipe surface that can repair the local failure surface in situ, which has a significant effect on extending the life of the pipeline and can save costs. Summary of the invention

[0004] The purpose of the present invention is to overcome the defect in the prior art that the hydrophobic surface of the pipe cannot be repaired in situ, and to provide a method and application for repairing the hydrophobicity of the pipe surface which can repair the local failure surface in situ and has a significant effect on extending the life of the pipeline.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] As a first aspect, a method for repairing the hydrophobicity of a pipe surface comprises the following steps:

[0007] S1. Roughening treatment of the surface of the pipe to be repaired;

[0008] S2. A repair solution is prepared, wherein the repair solution includes PDMS, a curing agent and Ni powder, and the mass ratio of PDMS, curing agent and Ni powder in the repair solution is 10:1:(10-15);

[0009] S3. The uncured repair solution prepared in step S2 is evenly coated on the surface of the pipe to be repaired after treatment in step S1;

[0010] S4. The surface of the pipe coated with the repair solution is laser ablated, and the PDMS, Ni powder and the pipe material coated on the surface of the pipe are melted and interwoven to form a super hydrophobic surface by laser ablation;

[0011] S5. Perform impurity removal treatment on the surface of the tube after laser ablation in step S4.

[0012] Specifically, the roughening treatment in step S1 includes one of mechanical impurity removal and chemical impurity removal.

[0013] Specifically, in step S2, the preparation of the repair solution: adding PDMS, curing agent, and Ni powder under ultrasound, and the mixed solution obtained by ultrasonic dispersion is the repair solution;

[0014] The ultrasonic power W of the ultrasonic dispersion is 700-1500W, the frequency f of the ultrasonic dispersion is 40KHz-60KHz, and the temperature of the ultrasonic dispersion is 25°C-50°C.

[0015] Specifically, the particle size of the Ni powder ranges from 170 mesh to 240 mesh.

[0016] Specifically, the thickness of the repair solution coated on the surface of the pipe in step S2 is:

[0017] If the pipe diameter is greater than DN≥40mm, the thickness of the repair solution applied by brushing is 0.8mm-1mm; if the pipe diameter is less than 40mm, the thickness of the repair solution applied by brushing is 0.3mm-0.5mm.

[0018] Specifically, if the diameter of the pipe is greater than DN ≥ 40 mm, the power of the laser ablation in step S4 is 30 to 50 W, the laser scanning interval is 400 to 500 μm, and the scanning speed is 150 to 180 mm / s;

[0019] If the diameter of the tube is less than 40 mm, the power of the laser ablation in step S4 is 0-30 W, the laser scanning interval is 200-300 mm, and the scanning speed is 100-120 mm / s.

[0020] Specifically, the impurity removal process in step S5 includes wiping removal or air blowing removal.

[0021] Specifically, the repair solution in step S2 is applied by brushing evenly multiple times.

[0022] Specifically, the chemical impurity removal includes applying acetic acid and / or dilute hydrochloric acid and / or hydrofluoric acid on the surface of the pipe to be repaired, so that impurities on the surface of the pipe to be repaired fall off.

[0023] As a second aspect, a hydrophobic pipe is obtained by using the method for repairing the hydrophobicity of the pipe surface as described above.

[0024] The beneficial effects of the method for repairing the hydrophobicity of the pipe surface of the present invention are:

[0025] The present invention firstly performs a roughening treatment on the surface of the pipe to be repaired, and then evenly brushes a special repair solution on the roughened pipe surface, reacts a hydrophobic PDMS material with Ni powder at a high temperature, and then fuses and interweaves with the pipe material ablated in a liquid state during the laser ablation process to form protrusions, which can ensure that the repaired pipe surface has strong hydrophobicity and good wear resistance. By directly brushing the repair solution on the surface of the failed pipe and laser ablating the pipe coated with the repair solution, super-hydrophobic repair of the pipe surface is achieved. The repair is relatively simple, easy to operate, not easily restricted by the environment, and the repaired hydrophobic surface has better hydrophobicity, which solves the problem in the prior art that the local failed surface cannot be repaired on-site, and plays a significant role in extending the life of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Figure 1 It is a flow chart of a method for repairing the hydrophobicity of a pipe surface according to an embodiment of the present invention.

[0028] Figure 2 It is a comparison diagram of the repaired sample and the blank sample using the first embodiment of the present invention.

[0029] Figure 3 It is a comparison diagram of the repaired sample and the blank sample using the second embodiment of the present invention.

[0030] Figure 4 It is a comparison diagram of the repaired sample and the blank sample using the third embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0032] like Figure 1 A specific embodiment of a method for repairing the hydrophobicity of a pipe surface according to the present invention includes the following steps:

[0033] S1. Roughening treatment of the surface of the pipe to be repaired.

[0034] S2. Prepare a repair solution, which includes PDMS, a curing agent and Ni powder. The mass ratio of PDMS, curing agent and Ni powder in the repair solution is 10:1:(10-15). The ratio of PDMS to curing agent is 1:10 and remains unchanged. However, the ratio of Ni powder can be increased or decreased within a range according to the usage scenario.

[0035] S3. The uncured repair solution prepared in step S2 is evenly coated on the surface of the pipe to be repaired after being treated in step S1; it should be further explained that the thickness of the repair solution coated on the surface of the pipe in step S2 is:

[0036] If the pipe diameter is greater than DN≥40mm, the thickness of the repair solution applied is 0.8mm~1mm; if the pipe diameter is <40mm, the thickness of the repair solution applied is 0.3mm~0.5mm. The larger the pipe diameter, the thicker the repair solution applied on the pipe, so that during the laser ablation process, there is enough repair solution to fuse and interweave with the ablated liquid pipe material, which also ensures that the hydrophobic surface has strong hydrophobicity.

[0037] S4. The surface of the pipe coated with the repair solution is laser ablated, and the PDMS and Ni powder coated on the surface of the pipe are melted and interwoven with the pipe material by laser ablation to form a super hydrophobic surface.

[0038] S5. Perform impurity removal treatment on the surface of the tube after laser ablation in step S4.

[0039] The roughening treatment in step S1 includes one of mechanical impurity removal and chemical impurity removal, wherein mechanical rust removal includes sanding the surface of the pipe to remove rust or impurities thereon, and chemical rust removal uses acetic acid, dilute hydrochloric acid, hydrofluoric acid and other chemical substances to be applied on the surface to remove impurities on the surface of the pipe to be repaired. In specific use, adaptive selection can be made according to influencing factors such as the use environment, operating space, and pipe material, and examples of the use scenarios will not be given one by one here.

[0040] In step S2, the preparation of the repair solution: PDMS, curing agent, and Ni powder are added under ultrasound, and the mixed solution obtained by ultrasonic dispersion is the repair solution. The ultrasonic power W of the ultrasonic dispersion is 700-1500W, the frequency f of the ultrasonic dispersion is 40KHz-60KHz, the temperature of the ultrasonic dispersion is 25℃-50℃, the particle size range of the Ni powder used is 170 mesh-240 mesh, and the particle size of the Ni powder and various parameters of the ultrasonic dispersion can be selected and adjusted according to specific requirements and use environment.

[0041] In step S4, to ensure the smooth progress of laser ablation, the parameters of laser ablation are set according to the diameter of the tube. Specifically, if the diameter of the tube is greater than DN≥40mm, the power of laser ablation in step S4 is 30-50W, the laser scanning interval is 400-500μm, and the scanning speed is 150-180mm / s; if the diameter of the tube is <40mm, the power of laser ablation in step S4 is 0-30W, the laser scanning interval is 200-300mm, and the scanning speed is 100-120mm / s.

[0042] It should be further explained that the impurity removal process in step S5 includes wiping removal or air blowing removal. Wiping removal is to manually wipe off the impurities on the hydrophobic surface after laser ablation and the debris floating on the hydrophobic surface with a paper towel or a rag. Air blowing removal is to use a device with a blowing function (such as a hair dryer) to blow off the impurities on the hydrophobic surface after laser ablation and the debris floating on the hydrophobic surface. The specific adaptability can be selected according to the use environment.

[0043] Embodiment 1

[0044] Example 1 Taking the inner wall of a copper tube with a diameter of 10 mm as an example, the specific method for repairing the hydrophobicity of the tube surface includes the following steps:

[0045] Use 400-mesh sandpaper to directly rough grind the surface of the pipeline, and polish the inner surface of the pipeline to ensure that there is no dust or impurities. Prepare a repair solution, the ratio of PDMS to curing agent and Ni powder in the solution is: 10:1:12, and manually brush the PDMS solution on the inner wall of the Φ10 copper tube. The mesh number of the Ni powder is 170 mesh and the thickness is about 0.5 mm. Because the mixed solution on the inner wall of the pipeline is easy to deposit in the center of the pipeline due to gravity, in this embodiment, a brush is used for multiple applications to make the film thickness formed by the solution as uniform as possible.

[0046] The infrared nanosecond laser was used to ablate the pipe surface, where the scanning power of the infrared nanosecond laser was 30W, the scanning interval was 300μm, and the scanning speed was 100mm / s. The infrared nanosecond laser sintered the mixed solution of PDMS and Ni powder together, and melted and intertwined with the material on the surface of the pipe to form a hydrophobic surface with good hydrophobic properties. Finally, the surface impurities were directly removed with a paper towel.

[0047] like Figure 2 As shown in the figure, the blank sample without any treatment and the sample repaired by the above repair method, it can be clearly seen that the untreated blank sample easily has water droplets hanging on the pipe wall, while the treated pipe is basically not sticky with rainwater. The pipe treated by the above method has better hydrophobicity.

[0048] Embodiment 2

[0049] Example 2 Taking the outer wall of a copper tube with a diameter of 10 mm as an example, the method for repairing the hydrophobicity of the surface of the tube according to the present invention comprises the following steps:

[0050] Use 450-mesh sandpaper to directly rough grind the pipe surface, polish the outer surface of the pipe clean, and ensure that there is no dust or impurities covering it; prepare the repair solution, and the ratio of PDMS, curing agent and Ni powder in the repair solution is 10:1:12. Use a 4-inch wool brush to manually apply the repair solution on the outer wall of the Φ10 copper pipe, and the mesh number of the Ni powder is 200 mesh. To ensure the uniform thickness of the inner wall repair solution, the wool brush can be applied multiple times, and the thickness is about 0.3mm.

[0051] An infrared nanosecond laser is used to ablate the surface of the pipeline, with a scanning power of 30W, a scanning interval of 200μm, and a scanning speed of 100mm / s. The mixed solution of PDMS and Ni powder is sintered together and melted and intertwined with the material on the surface of the pipe to form protrusions on the hydrophobic surface. Laser ablation ablates the pipe material to form grooves on the hydrophobic surface. Finally, a hair dryer is used to directly blow away the surface impurities to ensure the cleanliness and hydrophobicity of the repaired pipe surface.

[0052] like Figure 3 As shown in the figure, the blank sample without any treatment and the sample repaired by the above repair method, it can be clearly seen that the untreated blank sample easily has water droplets hanging on the pipe wall, while the treated pipe is basically not sticky with rainwater. The pipe treated by the above method has better hydrophobicity.

[0053] Embodiment 3

[0054] Example 3 Taking the outer wall of an aluminum tube with a diameter of 50 mm as an example, the method for repairing the hydrophobicity of the surface of the tube according to the present invention comprises the following steps:

[0055] Use hydrochloric acid to brush on the surface of the pipeline, clean the outer surface of the pipeline, and ensure that there is no dust or impurities; prepare the repair solution, and the ratio of PDMS to curing agent and Ni powder in the repair solution is 10:1:15. Use a large-sized wool brush to manually brush the repair solution on the outer wall of the Φ50 copper pipe, and the mesh number of Ni powder is 200 mesh. To ensure the uniform thickness of the outer wall repair solution, the wool brush can be brushed multiple times, and the thickness is about 0.9mm.

[0056] An infrared nanosecond laser is used to ablate the surface of the pipeline, where the infrared nanosecond laser scanning power is 40W, the scanning interval is 250μm, and the scanning speed is 150mm / s. The mixed solution of PDMS and Ni powder is sintered together and melted and intertwined with the material on the surface of the pipe to form protrusions on the hydrophobic surface. Laser ablation ablates the pipe material to form grooves on the hydrophobic surface. Finally, a hair dryer is used to directly blow away the surface impurities to ensure the cleanliness and hydrophobicity of the repaired pipe surface.

[0057] like Figure 4 As shown in the figure, the blank sample without any treatment and the sample repaired by the above repair method, it can be clearly seen that the untreated blank sample easily has water droplets hanging on the pipe wall, while the treated pipe is basically not sticky with rainwater. The pipe treated by the above method has better hydrophobicity.

[0058] like Figure 2 , Figure 3 as well as Figure 4 As shown, it can be clearly seen from multiple groups of embodiments that the untreated blank sample is easy to have water droplets hanging on the pipe wall, while the treated pipe is basically not sticky to rainwater, and the pipe treated by the above method has better hydrophobicity. The present invention first performs a roughening treatment on the surface of the pipe to be repaired, and then evenly brushes a special repair solution on the surface of the pipe after the roughening treatment, reacts the hydrophobic PDMS material and Ni powder at high temperature, and then fuses and interweaves with the pipe material ablated in liquid state during the laser ablation process to form hydrophobic protrusions, which can ensure that the surface of the repaired pipe has strong hydrophobicity and good wear resistance. By directly brushing the repair solution on the surface of the failed pipe and laser ablating the pipe with the repair solution, the super-hydrophobic repair of the pipe surface is achieved, the repair is relatively simple, the operation is convenient, it is not easily restricted by the environment, and the repaired hydrophobic surface has better hydrophobicity. Solving the problem of the existing technology that the local failed surface cannot be repaired on the spot has a significant effect on extending the life of the pipeline.

[0059] It should be understood that the specific embodiments described above are only used to explain the present invention, and are not used to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A method for repairing the hydrophobicity of a pipe surface, characterized in that: The following steps are involved: S1. Roughening treatment of the surface of the pipe to be repaired; S2. A repair solution is prepared, wherein the repair solution includes PDMS, a curing agent and Ni powder, and the mass ratio of PDMS, curing agent and Ni powder in the repair solution is 10:1:(10-15); S3. The uncured repair solution prepared in step S2 is evenly coated on the surface of the pipe to be repaired after treatment in step S1; S4. The surface of the pipe coated with the repair solution is laser ablated, and the PDMS, Ni powder and the pipe material coated on the surface of the pipe are melted and interwoven to form a super hydrophobic surface by laser ablation; S5. Perform impurity removal treatment on the surface of the tube after laser ablation in step S4.

2. A method for repairing the hydrophobicity of a pipe surface according to claim 1, characterized in that: The roughening treatment in step S1 includes one of mechanical impurity removal and chemical impurity removal.

3. A method for repairing the hydrophobicity of a pipe surface according to claim 1, characterized in that: In step S2, the repair solution is prepared by adding PDMS, curing agent and Ni powder under ultrasound, and the mixed solution obtained by ultrasonic dispersion is the repair solution; The ultrasonic power W of the ultrasonic dispersion is 700-1500W, the frequency f of the ultrasonic dispersion is 40KHz-60KHz, and the temperature of the ultrasonic dispersion is 25°C-50°C.

4. A method for repairing the hydrophobicity of a pipe surface according to claim 3, characterized in that: The particle size of the Ni powder ranges from 170 mesh to 240 mesh.

5. A method for repairing the hydrophobicity of a pipe surface according to claim 1, characterized in that: The thickness of the repair solution coated on the surface of the pipe in step S2 is: If the pipe diameter is greater than DN≥40mm, the thickness of the repair solution applied by brushing is 0.8mm-1mm; if the pipe diameter is less than 40mm, the thickness of the repair solution applied by brushing is 0.3mm-0.5mm.

6. A method for repairing the hydrophobicity of a pipe surface according to claim 5, characterized in that: If the diameter of the pipe is greater than DN ≥ 40 mm, the power of the laser ablation in step S4 is 30-50 W, the laser scanning interval is 400-500 μm, and the scanning speed is 150-180 mm / s; If the diameter of the tube is less than 40 mm, the power of the laser ablation in step S4 is 0-30 W, the laser scanning interval is 200-300 mm, and the scanning speed is 100-120 mm / s.

7. A method for repairing the hydrophobicity of a pipe surface according to claim 1, characterized in that: The impurity removal process in step S5 includes wiping removal or air blowing removal.

8. A method for repairing the hydrophobicity of a pipe surface according to claim 1, characterized in that: The repair solution in step S2 is applied evenly multiple times using a brush.

9. A method for repairing the hydrophobicity of a pipe surface according to claim 2, characterized in that: The chemical impurity removal includes applying acetic acid and / or dilute hydrochloric acid and / or hydrofluoric acid on the surface of the pipe to be repaired, so that impurities on the surface of the pipe to be repaired fall off.

10. A hydrophobic pipe, characterized in that: The hydrophobic pipe is obtained by the method for repairing the hydrophobicity of the pipe surface as described in any one of claims 1 to 9.

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