CN117798504A - Preparation method of reentrant corner structure with adjustable local wettability - Google Patents
Preparation method of reentrant corner structure with adjustable local wettability Download PDFInfo
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- CN117798504A CN117798504A CN202311854574.0A CN202311854574A CN117798504A CN 117798504 A CN117798504 A CN 117798504A CN 202311854574 A CN202311854574 A CN 202311854574A CN 117798504 A CN117798504 A CN 117798504A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 27
- 230000003075 superhydrophobic effect Effects 0.000 claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 239000002390 adhesive tape Substances 0.000 claims abstract description 14
- 239000011159 matrix material Substances 0.000 claims abstract description 14
- 238000011065 in-situ storage Methods 0.000 claims abstract description 11
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000001939 inductive effect Effects 0.000 claims abstract description 3
- 239000004793 Polystyrene Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 229920002223 polystyrene Polymers 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 238000002679 ablation Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 229920001721 polyimide Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000003373 anti-fouling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 241000251729 Elasmobranchii Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003090 exacerbative effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The invention discloses a preparation method of a reentrant corner structure with adjustable local wettability, which comprises the following steps: inducing microcolumn self-growth on the surface of a matrix material by utilizing laser to obtain a microcolumn structure array; covering a heterogeneous material adhesive tape with a material different from a matrix material on the top of the micro-column structure, and preparing a concave angle top structure on the surface of the heterogeneous material adhesive tape in situ by using femtosecond laser to obtain a mushroom head micro-column structure; spraying a super-hydrophobic coating on the surface of the whole matrix material including the mushroom head micro-column structure; and utilizing femtosecond laser to sweep the super-hydrophobic coating in the central local area of the surface of the heterogeneous material adhesive tape in situ, processing a hydrophilic vertex, and preparing the concave angle structure with adjustable and controllable local wettability. The reentrant structure prepared by the invention has excellent underwater air film retention and recovery, and has good underwater drag reduction capability.
Description
Technical Field
The invention belongs to the technical field of super-hydrophobic functional materials, and particularly relates to a preparation method of a reentrant structure with adjustable local wettability.
Background
The frictional resistance experienced by the ship during sailing is about 50% of the total resistance, and for underwater sports torpedoes, submarines and the like, this ratio can be as high as 70%. This not only reduces the speed of the ship's voyage, but also increases the energy consumption, exacerbating the greenhouse gas emissions. The friction resistance generated in the movement process is reduced, and the ship transportation device has remarkable effects of improving the ship transportation efficiency, saving energy, reducing the emission of greenhouse gases, reducing pollution and the like. Therefore, research on drag reduction and synergy technology has become a general concern in the marine industry.
The super-hydrophobic surface (SHSs) can bind the air film layer under water, convert part of the solid-liquid contact interface into a gas-liquid contact interface, and generate speed sliding on the gas-liquid interface to reduce the flow resistance, so that the method is a novel efficient drag reduction method; the underwater drag reduction is realized by constructing the specific hydrophobic microstructure layer on the outer surfaces of the ship and the aircraft, and the marine anti-fouling composite material has the advantages of simplicity, economy and marine anti-fouling function and is widely applied to related fields such as ocean engineering. However, most super-hydrophobic materials are easy to cause collapse or disappearance of a surface sealing gas film after being disturbed by water flow under water, so that the underwater drag reduction performance is affected or lost. In order to solve these problems, it is required to design a new structure that can maintain a long-term stable gas film under water and has high-efficiency drag reduction performance.
Disclosure of Invention
It is an object of the present invention to address at least the above problems and/or disadvantages and to provide at least the advantages described below.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a method for manufacturing a reentrant structure with controllable local wettability, comprising the steps of:
step one: inducing microcolumn self-growth on the surface of a matrix material by utilizing laser to obtain a microcolumn structure array;
step two: covering a heterogeneous material adhesive tape with a material different from a matrix material on the top of the micro-column structure, and preparing a concave angle top structure on the surface of the heterogeneous material adhesive tape in situ by using femtosecond laser to obtain a mushroom head micro-column structure;
step three: spraying a super-hydrophobic coating on the surface of the whole matrix material including the mushroom head micro-column structure;
step four: and utilizing femtosecond laser to sweep the super-hydrophobic coating in the central local area of the surface of the heterogeneous material adhesive tape in situ, processing a hydrophilic vertex, and preparing the concave angle structure with adjustable and controllable local wettability.
Preferably, the matrix material is heat-shrinkable polystyrene.
Preferably, in the first step, a femtosecond laser is used to continuously draw a preprogrammed two-dimensional circle on the surface of the substrate, the substrate in the two-dimensional circle is separated from the substrate on the x-y plane by ablation, and as the number of times of laser scanning the circle increases, the heat accumulated by the laser causes the bottom substrate to shrink and grow, so as to form the micro-column structure array.
Preferably, in the first step, the scanning power of the laser is 100-200 mW, the scanning speed is 30-100 mm/s, and the scanning times of each microcolumn structure are 50-80 times.
Preferably, the material of the heterogeneous material adhesive tape in the second step includes one of aluminum foil, polytetrafluoroethylene, polyethylene terephthalate, polyimide and polydimethylsiloxane.
Preferably, in the second step, a two-dimensional circle is continuously drawn in situ by using a femtosecond laser on a heterogeneous material adhesive tape covered on the top of the micro-column structure array until a concave angle top structure is cut, and the redundant heterogeneous material is torn off.
Preferably, the thickness of the heterogeneous material adhesive tape on the top of the surface of the reentrant structures is 50 μm.
Preferably, in the third step, the material of the superhydrophobic coating comprises a Glaco solution and hydrophobic silica particles, and the superhydrophobic coating is sprayed at a distance of 10cm from the base material by using a spray gun.
The application of the locally wettability-adjustable reentrant structures is that the locally wettability-adjustable reentrant structures are applied to the construction of hydrophobic microstructure layers for realizing underwater drag reduction on the outer surfaces of ships and aircrafts.
The invention at least comprises the following beneficial effects:
firstly, the reentrant structures are manufactured by laser in-situ induction self-growth on the surface of Polystyrene (PS), and compared with the traditional reentrant preparation method for micro-nano processing, the preparation method has the advantages of simple preparation process, short preparation time, flexible control of parameters, adjustable local wettability and the like.
Secondly, the hydrophilic point arranged at the top of the prepared concave angle structure with adjustable local wettability can firmly pin the gas-liquid interface under water, so that better underwater gas film retention is realized, and meanwhile, the high-efficiency drag reduction performance is realized;
thirdly, by utilizing the flexibility of Polystyrene (PS) substrates, their good underwater gas film retention and drag reduction properties can be easily transferred to curved surfaces with excellent application potential.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic illustration of the preparation flow of a reentrant structure with controlled localized wettability of example 1;
FIG. 2 is an SEM photograph of a locally wettability-controllable reentrant structure prepared in example 1;
FIG. 3 is a graph comparing drag reduction rates in air for reentrant structures prepared in example 1, comparative example 1-comparative example 2;
FIG. 4 is a graph showing the comparison of drag reduction ratio changes in repeated experiments for reentrant structures prepared in example 1, comparative example 1-comparative example 2.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
As shown in fig. 1, the embodiment provides a preparation method of a reentrant structure with controllable local wettability, which includes the following steps:
step one: continuously drawing a preprogrammed two-dimensional circle on the surface of a Polystyrene (PS) plate by using femtosecond laser, wherein the scanning power is 140mw, the scanning speed is 50mm/s, the scanning times are 65 times, a PS layer in the two-dimensional circle is separated from a matrix on an x-y plane through ablation, and the PS shrinkage growth is caused by the accumulated heat of the laser along with the increase of the times of laser scanning the circle to form a micro-column structure;
step two: covering a layer of aluminum foil tape on the top of the micro-column structure, continuously drawing a two-dimensional circle by using femtosecond laser until the mushroom head top structure is cut, and tearing off the redundant aluminum foil tape to obtain the mushroom head micro-column structure;
step three: spraying a SOFT 99-flag product Glaco solution on the surface of a Polystyrene (PS) plate integrally comprising a mushroom head microcolumn structure, wherein the spraying distance is 10cm, so as to obtain a super-hydrophobic coating;
step four: utilizing femtosecond laser to sweep the super-hydrophobic coating in the central local area of the surface of the aluminum foil in situ, processing a hydrophilic vertex, and preparing a concave angle structure with adjustable and controllable local wettability; the reentrant structures prepared in this example were designated as HMMs.
The reentrant structures of example 1 were measured to have a contact angle of 121 °, a roll angle of 90 °, high adhesion and a drag reduction of 43.7% after 100 drag reduction experiments.
Comparative example 1
The comparative example proposes a preparation method of a reentrant structure with controllable local wettability, the preparation method comprising the following steps:
step one: processing the surface of the micro-column structure: continuously drawing a preprogrammed two-dimensional circle on the surface of a Polystyrene (PS) plate by using femtosecond laser, wherein the scanning power is 140mw, the scanning speed is 50mm/s, the scanning times are 65 times, a PS layer in the two-dimensional circle is separated from a matrix on an x-y plane through ablation, and the PS shrinkage growth is caused by the accumulated heat of the laser along with the increase of the times of laser scanning the circle to form a micro-column structure surface;
step two: spraying a super-hydrophobic coating, namely spraying the super-hydrophobic coating 10cm away from a Polystyrene (PS) plate by using a spray gun by adopting a Glaco solution of a product under a SOFT99 flag; the reentrant structures prepared in this comparative example were designated as SHMs.
The contact angle of the structural surface in comparative example 1 was measured to be 154 deg., the rolling angle was measured to be 4 deg., and after 100 drag reduction experiments, the drag reduction rate was reduced to 18.2%.
Comparative example 2
The comparative example proposes a reentrant structure with controllable local wettability, the preparation method comprising the steps of:
step one: machining the surface of the reentrant structures: continuously drawing a preprogrammed two-dimensional circle on the surface of a Polystyrene (PS) plate by using femtosecond laser, wherein the scanning power is 140mw, the scanning speed is 50mm/s, the scanning times are 65 times, a PS layer in the two-dimensional circle is separated from a matrix on an x-y plane through ablation, and the PS shrinkage growth is caused by the accumulated heat of the laser along with the increase of the times of laser scanning the circle, so that a micro-column structure is formed;
step two: continuously drawing a two-dimensional circle in situ by using femtosecond laser until a reentrant top structure is cut, and tearing off the redundant aluminum foil adhesive tape to obtain the reentrant structure;
step three: spraying a super-hydrophobic coating, namely spraying the super-hydrophobic coating 10cm away from a Polystyrene (PS) plate by using a spray gun by adopting a Glaco solution of a product under a SOFT99 flag; the reentrant structures prepared in this comparative example were designated as SHMMs.
The contact angle of the structured surface in example 2 was measured as: 152 °, roll angle is: after 100 drag reduction experiments, the drag reduction rate is 40.9 percent at 6 degrees.
Application example 1
The application example provides application of the locally-wettability-adjustable reentrant structure, which is prepared by the embodiment 1, and is applied to construction of a hydrophobic microstructure layer for realizing underwater drag reduction on the outer surfaces of ships and aircrafts.
The drag reduction rates of the original polystyrene micro-column structures (Hs) in air and water were measured respectively, and the drag reduction rates of the reentrant Structures (HMMs) prepared in example 1, the reentrant Structures (SHMs) prepared in comparative example 1, and the reentrant Structures (SHMMs) prepared in comparative example 2 in water were obtained to obtain fig. 3, and it can be seen from fig. 3 that the speed of Hs passing through the drag reduction test light gate in air was 176mm/s, and the underwater passing speed thereof was reduced to 159mm/s under the influence of water resistance. The underwater transit speeds of SHMs, SHMMs and HMMs were 165.9mm/s, 168.6mm/s and 166.8mm/s, respectively. The corresponding drag reduction rates are 40.5%, 56.4% and 45.8%, respectively, and the drag reduction effects are obvious.
The drag reduction rate data of the reentrant Structures (HMMs) prepared in example 1, the reentrant Structures (SHMs) prepared in comparative example 1, and the reentrant Structures (SHMMs) prepared in comparative example 2 during the drag reduction test of 0 to 100 times were measured, respectively, to obtain fig. 4, from which it can be seen from fig. 4: in 75-100 deceleration tests, the reentrant structure prepared in the example 1 has a larger drag reduction rate than that of the reentrant structures prepared in the comparative examples 1 and 2, which shows that the reentrant structure prepared in the example 1 can stably pin the air film under water, and the drag reduction rate is not changed basically after multiple experiments.
The number of equipment and the scale of processing described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be readily apparent to those skilled in the art.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (9)
1. The preparation method of the reentrant corner structure with adjustable local wettability is characterized by comprising the following steps of:
step one: inducing microcolumn self-growth on the surface of a matrix material by utilizing laser to obtain a microcolumn structure array;
step two: covering a heterogeneous material adhesive tape with a material different from a matrix material on the top of the micro-column structure, and preparing a concave angle top structure on the surface of the heterogeneous material adhesive tape in situ by using femtosecond laser to obtain a mushroom head micro-column structure;
step three: spraying a super-hydrophobic coating on the surface of the whole matrix material including the mushroom head micro-column structure;
step four: and utilizing femtosecond laser to sweep the super-hydrophobic coating in the central local area of the surface of the heterogeneous material adhesive tape in situ, processing a hydrophilic vertex, and preparing the concave angle structure with adjustable and controllable local wettability.
2. The method of preparing a reentrant structure with controllable localized wettability according to claim 1, wherein the matrix material is a heat-shrinkable polystyrene.
3. The method for preparing a reentrant structure with controllable local wettability according to claim 1, wherein in the first step, a femtosecond laser is used to continuously draw a preprogrammed two-dimensional circle on the surface of the substrate, the substrate in the two-dimensional circle is separated from the substrate on the x-y plane by ablation, and as the number of times of laser scanning the circle increases, the heat accumulated by the laser causes the bottom substrate to shrink and grow, thereby forming a micro-column structure array.
4. The method for preparing a concave angle structure with adjustable local wettability according to claim 1, wherein in the first step, the scanning power of the laser is 100-200 mW, the scanning speed is 30-100 mm/s, and the scanning times of each micro-column structure is 50-80 times.
5. The method for preparing a reentrant structure with controllable local wettability according to claim 1, wherein the material of the heterogeneous material tape in the second step comprises one of aluminum foil, polytetrafluoroethylene, polyethylene terephthalate, polyimide, and polydimethylsiloxane.
6. The method for preparing the reentrant structure with adjustable local wettability according to claim 1, wherein in the second step, a two-dimensional circle is continuously drawn in situ by using a femtosecond laser on a heterogeneous material adhesive tape covered on the top of the micro-column structure array until the reentrant top structure is cut, and the redundant heterogeneous material is torn off.
7. The method for preparing a reentrant structure with controllable local wettability according to claim 1, wherein the thickness of the tape of heterogeneous material on top of the surface of the reentrant structure is 50 μm.
8. The method for preparing a reentrant structure with controllable local wettability according to claim 1, wherein in the third step, the material of the superhydrophobic coating comprises a Glaco solution and hydrophobic silica particles, and the superhydrophobic coating is sprayed by a spray gun at a distance of 10cm from the base material.
9. Use of a locally wettability-controllable re-entrant structure, prepared by a method of preparing a locally wettability-controllable re-entrant structure as claimed in any one of claims 1 to 8, characterized in that the locally wettability-controllable re-entrant structure is used for the construction of a hydrophobic micro-structure layer for the realization of underwater drag reduction on the outer surfaces of ships and aircraft.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311854574.0A CN117798504B (en) | 2023-12-29 | 2023-12-29 | Preparation method of reentrant corner structure with adjustable local wettability |
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| CN202311854574.0A CN117798504B (en) | 2023-12-29 | 2023-12-29 | Preparation method of reentrant corner structure with adjustable local wettability |
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| CN117798504B CN117798504B (en) | 2024-06-07 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103738913A (en) * | 2013-12-31 | 2014-04-23 | 中山大学 | Method for manufacturing quasi-three-dimensional micron-nanometer column array |
| US20140314995A1 (en) * | 2012-10-23 | 2014-10-23 | Imra America, Inc. | Pulsed laser processing method for producing superhydrophobic surfaces |
| CN205062210U (en) * | 2015-10-29 | 2016-03-02 | 广东工业大学 | Super thin oily surface texture of electrotyping forming |
| CN109226973A (en) * | 2018-10-30 | 2019-01-18 | 江苏大学 | A kind of laser-electrochemical deposition prepares the system and method for bionic super-hydrophobic metal surface |
| CN115716928A (en) * | 2022-11-22 | 2023-02-28 | 西南科技大学 | Preparation method of super-amphiphobic surface with inclined stepped mushroom head micro-column structure |
| TWM645800U (en) * | 2023-06-02 | 2023-09-01 | 日揚科技股份有限公司 | Laser-treated anti-deposition object |
-
2023
- 2023-12-29 CN CN202311854574.0A patent/CN117798504B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140314995A1 (en) * | 2012-10-23 | 2014-10-23 | Imra America, Inc. | Pulsed laser processing method for producing superhydrophobic surfaces |
| CN103738913A (en) * | 2013-12-31 | 2014-04-23 | 中山大学 | Method for manufacturing quasi-three-dimensional micron-nanometer column array |
| CN205062210U (en) * | 2015-10-29 | 2016-03-02 | 广东工业大学 | Super thin oily surface texture of electrotyping forming |
| CN109226973A (en) * | 2018-10-30 | 2019-01-18 | 江苏大学 | A kind of laser-electrochemical deposition prepares the system and method for bionic super-hydrophobic metal surface |
| CN115716928A (en) * | 2022-11-22 | 2023-02-28 | 西南科技大学 | Preparation method of super-amphiphobic surface with inclined stepped mushroom head micro-column structure |
| TWM645800U (en) * | 2023-06-02 | 2023-09-01 | 日揚科技股份有限公司 | Laser-treated anti-deposition object |
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