CN117102001A - Preparation method and application of super-hydrophobic anti-icing coating capable of controlling spraying pressure - Google Patents
Preparation method and application of super-hydrophobic anti-icing coating capable of controlling spraying pressure Download PDFInfo
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- CN117102001A CN117102001A CN202310895707.2A CN202310895707A CN117102001A CN 117102001 A CN117102001 A CN 117102001A CN 202310895707 A CN202310895707 A CN 202310895707A CN 117102001 A CN117102001 A CN 117102001A
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- 238000000576 coating method Methods 0.000 title claims abstract description 92
- 239000011248 coating agent Substances 0.000 title claims abstract description 72
- 238000005507 spraying Methods 0.000 title claims abstract description 44
- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000011521 glass Substances 0.000 claims abstract description 30
- 239000007921 spray Substances 0.000 claims description 54
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 33
- 239000011259 mixed solution Substances 0.000 claims description 30
- 239000003822 epoxy resin Substances 0.000 claims description 27
- 229920000647 polyepoxide Polymers 0.000 claims description 27
- -1 polytetrafluoroethylene Polymers 0.000 claims description 14
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 12
- KKYDYRWEUFJLER-UHFFFAOYSA-N 1,1,2,2,3,3,4,4,5,5,6,6,7,7,10,10,10-heptadecafluorodecyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F KKYDYRWEUFJLER-UHFFFAOYSA-N 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 6
- ZHPNWZCWUUJAJC-UHFFFAOYSA-N fluorosilicon Chemical compound [Si]F ZHPNWZCWUUJAJC-UHFFFAOYSA-N 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 5
- 239000000203 mixture Substances 0.000 claims 1
- 239000012212 insulator Substances 0.000 abstract description 6
- 230000033228 biological regulation Effects 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 44
- 230000008014 freezing Effects 0.000 description 13
- 238000007710 freezing Methods 0.000 description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 239000008367 deionised water Substances 0.000 description 7
- 229910021641 deionized water Inorganic materials 0.000 description 7
- 238000004506 ultrasonic cleaning Methods 0.000 description 7
- 239000012456 homogeneous solution Substances 0.000 description 6
- 230000002209 hydrophobic effect Effects 0.000 description 6
- 239000002086 nanomaterial Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 238000011056 performance test Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 241000131505 Gloriosa Species 0.000 description 1
- 240000007472 Leucaena leucocephala Species 0.000 description 1
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006910 ice nucleation Effects 0.000 description 1
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- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/50—Insulators or insulating bodies characterised by their form with surfaces specially treated for preserving insulating properties, e.g. for protection against moisture, dirt, or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2203/00—Other substrates
- B05D2203/30—Other inorganic substrates, e.g. ceramics, silicon
- B05D2203/35—Glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
- B05D2506/15—Polytetrafluoroethylene [PTFE]
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
Abstract
The application discloses a preparation method of a super-hydrophobic anti-icing coating for controlling spraying pressure, and provides a simple, efficient and suitable for large-scale production. The preparation method adopts a one-step spraying method to prepare the super-hydrophobic coating on the glass slide, and realizes the preparation of the super-hydrophobic coating with excellent anti-icing performance by optimizing the microstructure and wettability of the spraying pressure regulation coating. The prepared super-hydrophobic coating has high application potential in the anti-icing field of glass insulators.
Description
Technical Field
The application belongs to the field of hydrophobic anti-icing coatings, and particularly relates to a preparation method and application of a super-hydrophobic anti-icing coating prepared by controlling spraying pressure.
Background
Icing of transmission lines is one of the most serious threats faced by power systems. The glass insulator is used as an important component of a power transmission line, is widely applied and is mainly used for electric insulation and mechanical fixation. Icing on the surface of the glass insulator can lead to a reduction in flashover voltage and even to a loss of insulation properties. This severely interferes with the safe operation of the power system. A number of active or passive techniques have been proposed to improve anti-icing performance. However, conventional deicing techniques have problems of inefficiency and expensive equipment. Conventional hydrophobic coatings (e.g., RTV and PRTV) are typically used to improve stain resistance, which is further desired. There is no anti-icing coating that can be practically applied to glass insulators.
Superhydrophobic surfaces based on the lotus leaf effect have been widely studied as potential anti-icing coatings. In general, the preparation of superhydrophobic coatings can be accomplished by building up a roughness structure and modifying with low surface energy. The surface of the super-hydrophobic coating has a special micro-nano structure, so that water drops can be in a Cassie state. This facilitates the rolling off of the water droplets from the surface and reduces the likelihood of ice formation. The air cushion in the roughened structure can also delay frosting and droplet freezing by effectively reducing the heat transfer rate. In addition, the ice adhesion strength of the material surface is significantly reduced due to the combined action of the air cushion and the low surface energy substance. Therefore, the super-hydrophobic coating not only can delay icing, but also is beneficial to deicing after icing. However, the existing preparation process of the super-hydrophobic anti-icing paint is complicated and expensive, and a simple and convenient paint preparation method is needed to be suitable for industrial batch production.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present application has been made in view of the above and/or problems occurring in the prior art.
Therefore, the application aims to overcome the defects in the prior art and provide a preparation method of a super-hydrophobic anti-icing coating for controlling spraying pressure.
In order to solve the technical problems, the application provides the following technical scheme: a method for preparing a super-hydrophobic anti-icing coating by controlling spraying pressure comprises the following steps,
ethyl acetate, polytetrafluoroethylene and heptadecafluorodecyl trimethoxysilane are taken and put into a beaker to prepare a mixed solution A;
uniformly stirring the mixed solution A, then performing ultrasonic dispersion, and then adding epoxy resin and fluorosilicone resin, and uniformly stirring to obtain a mixed solution B;
adding an epoxy resin curing agent into the mixed solution B and uniformly stirring to obtain a mixed solution C;
pouring the mixed solution C into a spray can, spraying the spray gun aiming at the glass slide, and controlling the spraying distance and the spraying pressure;
and (3) solidifying the sprayed coating at room temperature, and drying at high temperature to obtain the super-hydrophobic anti-icing coating with the spraying pressure controlled.
As a preferred embodiment of the preparation process according to the application, there is provided: the mixed solution comprises 25g of ethyl acetate, polytetrafluoroethylene and heptadecafluorodecyl trimethoxysilane in mass ratio: 4.5g:0.8g.
As a preferred embodiment of the preparation process according to the application, there is provided: and after stirring uniformly, performing ultrasonic dispersion, wherein the stirring time is 5-20 min.
As a preferred embodiment of the preparation process according to the application, there is provided: the ultrasonic dispersion is carried out, wherein the dispersion time is 5-20 min.
As a preferred embodiment of the preparation process according to the application, there is provided: the epoxy resin and the fluorine silicon resin are added and stirred uniformly to obtain a mixed solution B, wherein the mass ratio of the epoxy resin to the fluorine silicon resin is 4g:3g.
As a preferred embodiment of the preparation process according to the application, there is provided: the epoxy resin curing agent is added into the mixed solution B and stirred uniformly, wherein the mass ratio of the epoxy resin curing agent to the epoxy resin is 1.2g:4g.
As a preferred embodiment of the preparation process according to the application, there is provided: and the spray gun is aligned to the glass slide to spray, and the spraying distance and the spraying pressure are controlled, wherein the diameter of the spray gun nozzle is 1-2 mm, the spraying distance is 10-20 cm, and the spraying pressure is 0.1-0.5 MPa.
As a preferred embodiment of the preparation process according to the application, there is provided: and (3) curing the sprayed coating at room temperature and then drying at a high temperature, wherein the curing time is 1-2 h, and the drying time is 12-24 h.
Another object of the present application is to overcome the deficiencies of the prior art and to provide an application of a superhydrophobic anti-icing coating that controls spray pressure.
The application has the beneficial effects that:
the application provides a simple, efficient and suitable for large-scale production super-hydrophobic coating preparation method, which improves the anti-icing performance of the super-hydrophobic coating through optimizing the process, can improve the anti-corrosion performance and the high temperature resistance of glass when being applied to a glass carrier, and has higher durability compared with the coating in the prior art.
The preparation method adopts a one-step spraying method to prepare the super-hydrophobic coating on the glass slide, and realizes the preparation of the super-hydrophobic coating with excellent anti-icing performance by optimizing the microstructure and wettability of the spraying pressure regulation coating. The prepared super-hydrophobic coating has high application potential in the anti-icing field of glass insulators.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a graph comparing the microstructure and three-dimensional morphology of the coatings prepared in examples 1-4.
FIG. 2 is a graph comparing the wettability of the coatings prepared in examples 1-4.
FIG. 3 is a comparison of the bouncing behavior of water droplets of the coatings prepared in examples 1-4.
FIG. 4 is a graph comparing freezing times of coatings prepared in examples 1-4.
Fig. 5 is a graph comparing ice adhesion strength of the coatings prepared in examples 1-4.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more apparent, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The epoxy resin (GCC 135) and curing agent used in the examples of the present application were supplied by kunshan green circulation chemical company, ltd. Fluorosilicone resins were purchased from Chengdu Ai Keda chemical agents Co. Heptadecafluorodecyl trimethoxysilane is supplied by Shanghai Ala Ding Shiji Co. The average particle diameter of the polytetrafluoroethylene powder was 200nm, which was supplied by Shanghai microphone Lin Shenghua Co. Ethyl acetate and absolute ethanol were purchased from the adult city cologne chemical company limited and the Chongqing Chuan Dong chemical (group) limited, respectively. Glass slides (7101) were provided by Jiangsu Feisha glass plastic Co.
The performance test method in the embodiment of the application comprises the following steps:
the scanning electron microscope is used for representing the microstructure of the coating, and the laser scanning confocal microscope is used for observing the three-dimensional morphology and measuring the surface roughness; measuring the contact angle and sliding angle of the coating at room temperature by using a water contact angle meter; analyzing the bouncing behavior of water drops on the surface of the coating by using a high-speed camera; the freezing time of the coating was measured using a semiconductor refrigeration station.
Example 1
25g of ethyl acetate, 4.5g of polytetrafluoroethylene and 0.8g of heptadecafluorodecyl trimethoxysilane were placed in the beaker in this order. The mixed solution was stirred on a magnetic stirrer for 10 minutes, and then ultrasonically dispersed for 10 minutes. After ultrasonic dispersion, 4g of epoxy resin and 3g of fluorosilicone resin were added and magnetically stirred for 25 minutes. Then, 1.2g of an epoxy resin curing agent was added and magnetically stirred for 5 minutes to obtain a well-mixed homogeneous solution. Before spraying, the glass slides are respectively placed in absolute ethyl alcohol and deionized water for ultrasonic cleaning. The uniformly mixed solution was poured into a spray can and the spray gun was sprayed against a vertically placed slide. The nozzle diameter was 1.5mm and the spray distance was kept at 15cm. The spraying pressure is controlled at 0.1MPa, and the double surfaces of the glass slide are sprayed. The sprayed coating was cured at room temperature for 1 hour and then placed in a dry box overnight.
Example 2
25g of ethyl acetate, 4.5g of polytetrafluoroethylene and 0.8g of heptadecafluorodecyl trimethoxysilane were placed in the beaker in this order. The mixed solution was stirred on a magnetic stirrer for 10 minutes, and then ultrasonically dispersed for 10 minutes. After ultrasonic dispersion, 4g of epoxy resin and 3g of fluorosilicone resin were added and magnetically stirred for 25 minutes. Then, 1.2g of an epoxy resin curing agent was added and magnetically stirred for 5 minutes to obtain a well-mixed homogeneous solution. Before spraying, the glass slides are respectively placed in absolute ethyl alcohol and deionized water for ultrasonic cleaning. The uniformly mixed solution was poured into a spray can and the spray gun was sprayed against a vertically placed slide. The nozzle diameter was 1.5mm and the spray distance was kept at 15cm. The spraying pressure is controlled at 0.2MPa, and the double surfaces of the glass slide are sprayed. The sprayed coating was cured at room temperature for 1 hour and then placed in a dry box overnight.
Example 3
25g of ethyl acetate, 4.5g of polytetrafluoroethylene and 0.8g of heptadecafluorodecyl trimethoxysilane were placed in the beaker in this order. The mixed solution was stirred on a magnetic stirrer for 10 minutes, and then ultrasonically dispersed for 10 minutes. After ultrasonic dispersion, 4g of epoxy resin and 3g of fluorosilicone resin were added and magnetically stirred for 25 minutes. Then, 1.2g of an epoxy resin curing agent was added and magnetically stirred for 5 minutes to obtain a well-mixed homogeneous solution. Before spraying, the glass slides are respectively placed in absolute ethyl alcohol and deionized water for ultrasonic cleaning. The uniformly mixed solution was poured into a spray can and the spray gun was sprayed against a vertically placed slide. The nozzle diameter was 1.5mm and the spray distance was kept at 15cm. The spraying pressure is controlled at 0.3MPa, and the double surfaces of the glass slide are sprayed. The sprayed coating was cured at room temperature for 1 hour and then placed in a dry box overnight.
Example 4
25g of ethyl acetate, 4.5g of polytetrafluoroethylene and 0.8g of heptadecafluorodecyl trimethoxysilane were placed in the beaker in this order. The mixed solution was stirred on a magnetic stirrer for 10 minutes, and then ultrasonically dispersed for 10 minutes. After ultrasonic dispersion, 4g of epoxy resin and 3g of fluorosilicone resin were added and magnetically stirred for 25 minutes. Then, 1.2g of an epoxy resin curing agent was added and magnetically stirred for 5 minutes to obtain a well-mixed homogeneous solution. Before spraying, the glass slides are respectively placed in absolute ethyl alcohol and deionized water for ultrasonic cleaning. The uniformly mixed solution was poured into a spray can and the spray gun was sprayed against a vertically placed slide. The nozzle diameter was 1.5mm and the spray distance was kept at 15cm. The spraying pressure is controlled at 0.4MPa, and the double surfaces of the glass slide are sprayed. The sprayed coating was cured at room temperature for 1 hour and then placed in a dry box overnight.
Fig. 1 is a graph comparing the microstructure and three-dimensional morphology of the coatings prepared in examples 1-4, and it is clear that the spray pressure has a significant effect on the micro-nano structure of the coating. When the spray pressure was 0.1MPa, a localized distribution of polytetrafluoroethylene nanoparticles on the surface was observed (fig. 1 a). This is because the air pressure is insufficient, and the solution cannot be stably discharged. As the spray pressure increases, the polytetrafluoroethylene nanoparticles are distributed over the surface (fig. 1c and e). Notably, at a spray pressure of 0.4MPa, excessive air pressure pressed the polytetrafluoroethylene nanoparticles together to form an agglomerated structure (fig. 1 g). Furthermore, the three-dimensional morphology (fig. 1b, d, f and h) further demonstrates the effect of spray pressure on the roughness. As the spray pressure was increased from 0.1MPa to 0.4MPa, the surface roughness of the coating increased greatly from 0.974 μm to 5.757 μm, which means that the roughness of the surface could be changed by adjusting the spray pressure.
The contact angle and sliding angle of the coatings prepared in examples 1 to 4 at room temperature were measured using a water contact angle meter, and the results are shown in fig. 2. Different spray pressures can create different roughness on the surface, which greatly affects wetting properties. As the spray pressure increases, the contact angle increases and then stabilizes. When the spray pressure was 0.1MPa, the contact angle of the coating was only 128.2 ° (fig. 2 a). At this time, the sliding angle is greater than 90 °, and the water droplets are easily adsorbed on the surface (fig. 2 b). When the spray pressure was increased to 0.2MPa, the contact angle of the coating exceeded 150 °. Wherein the contact angles of the coatings prepared at 0.3MPa and 0.4MPa are up to 168.3 ° and 166.7 °, respectively. Furthermore, the sliding angle of the coating gradually decreases with increasing spray pressure. As the spray pressure increased from 0.2MPa to 0.3MPa, the sliding angle of the coating was reduced from 9.3 ° to 4.0 °. The slip angle of the coating prepared at 0.4MPa is as low as 4.3 °. This is due to the fact that the increase in spray pressure forms a rough structure on the surface. Thus, an appropriate increase in spray pressure helps produce a surface with superhydrophobic properties. This facilitates the rolling off of the water droplets from the surface and reduces the likelihood of ice formation.
The bouncing behavior of the water droplets on the surface of the coating was analyzed with a high-speed camera. Figure 3 shows the water droplet bounce properties of the coatings prepared in examples 1-4. For coatings prepared at 0.1MPa, the water droplets did not bounce after striking the surface (fig. 3 a). This indicates that the surface of the coating has a large surface energy and easily adsorbs water droplets. When the spray pressure was increased to 0.2MPa, rebound behavior was observed after the water droplets impacted the coating surface. The large water droplets after impact will break up into a plurality of small water droplets and bounce (fig. 3b, c and d). This is because the roughness and low surface energy species on the surface reduce the surface energy. In addition, the air cushion in the rough structure can reduce the energy of water drop bouncing. The droplets on the surface of the 0.3MPa coating also rebound once more compared to the 0.2MPa and 0.4MPa coatings, which is consistent with a more uniform structure of the 0.3MPa coating. Therefore, a superhydrophobic surface having good water droplet bounce properties can prevent or delay icing by reducing the contact of water droplets with the surface.
The freezing times of the coatings prepared in examples 1-4 were measured using a semiconductor refrigeration station, as shown in fig. 4. Over time, the water droplets on the surface of the coating undergo ice nucleation and expansion, eventually freezing completely. As the spray pressure increases, the freezing time of the coating increases and then decreases. This is consistent with microstructure (fig. 1) and wettability (fig. 2). The freezing time of the coating prepared at the lower spray pressure (0.1 MPa) was only 11.3 minutes. The freezing times for the coatings prepared at 0.2MPa and 0.3MPa were increased to 35.0 minutes and 46.5 minutes, respectively. However, as the spray pressure was further increased to 0.4MPa, the freezing time of the coating was reduced to 42.0min. The coating prepared at 0.3MPa exhibited a more uniform micro-nano structure. The micro-nano structure enhances the superhydrophobicity and ice resistance of the coating. The air cushion in the structure reduces the heat transfer rate, thereby effectively delaying icing.
In addition, the ice adhesion strength of the coatings prepared in examples 1-4 was evaluated, as shown in FIG. 5. The ice adhesion strength of the coating tends to decrease and then increase with increasing spray pressure. This is mainly due to the rough structure of the surface. At a spray pressure of 0.1MPa, no uniform micro-nano structure is formed on the surface, and the adhesive strength of ice is as high as 90.4kPa. The ice adhesion strength of the coatings prepared at 0.2MPa and 0.3MPa was 81.2kPa and 55.9kPa, respectively. This is because the air cushion reduces the contact area of the solid ice. In addition, the low surface energy substance may reduce the adhesive strength of ice by reducing the electrostatic force. When the spraying pressure was increased to 0.4MPa, an agglomerated structure was formed on the surface. At this time, the ice adhesion strength increased to 93.5kPa due to the mechanical interlock formed between the ice and the surface. In a word, the more even micro-nano structure can reduce the ice adhesion strength after icing, and is favorable for timely deicing.
Thus, the coating prepared at 0.3MPa has excellent hydrophobic properties (contact angle up to 168.3 °, sliding angle down to 4.0 °) and anti-icing properties (freezing time 46.5 minutes, ice adhesion strength 55.9 kPa). Namely, the super-hydrophobic coating with good anti-icing performance can be prepared by adjusting the spraying pressure, and the super-hydrophobic coating is hopeful to become a novel anti-icing coating for glass insulators.
Comparative example 1
The anti-icing coating existing in the market is selected and mainly referred to as the anti-icing coating produced by the gloriosa of China.
The purchased anti-icing coating was poured into a spray can and the spray gun was sprayed against a vertically placed slide. Before spraying, the glass slides are respectively placed in absolute ethyl alcohol and deionized water for ultrasonic cleaning. The nozzle diameter was 1.5mm and the spray distance was kept at 15cm. The spraying pressure is controlled at 0.3MPa, and the double surfaces of the glass slide are sprayed. The sprayed coating was cured at room temperature for 1 hour and then placed in a dry box overnight. The same performance test method as the inventive example was used to test its hydrophobic and anti-icing properties, and it was measured that its contact angle was 160.4 °, sliding angle was 8.6 °, freezing time was 36 minutes, and ice adhesion strength was 84.7kPa.
Comparative example 2
25g of ethyl acetate, 4.5g of polytetrafluoroethylene and 1g of heptadecafluorodecyl trimethoxysilane were placed in the beaker in this order. The mixed solution was stirred on a magnetic stirrer for 10 minutes, and then ultrasonically dispersed for 10 minutes. After ultrasonic dispersion, 4g of epoxy resin and 3g of fluorosilicone resin were added and magnetically stirred for 25 minutes. Then, 1.2g of an epoxy resin curing agent was added and magnetically stirred for 5 minutes to obtain a well-mixed homogeneous solution. Before spraying, the glass slides are respectively placed in absolute ethyl alcohol and deionized water for ultrasonic cleaning. The uniformly mixed solution was poured into a spray can and the spray gun was sprayed against a vertically placed slide. The nozzle diameter was 1.5mm and the spray distance was kept at 15cm. The spraying pressure is controlled at 0.3MPa, and the double surfaces of the glass slide are sprayed. The sprayed coating was cured at room temperature for 1 hour and then placed in a dry box overnight. The same performance test method as the inventive example was used to test its hydrophobic and anti-icing properties, and it was measured that its contact angle was 156.2 °, sliding angle was 7.6 °, freezing time was 29 minutes, and ice adhesion strength was 99.5kPa.
Comparative example 3
25g of ethyl acetate, 4.5g of polytetrafluoroethylene and 0.8g of heptadecafluorodecyl trimethoxysilane were placed in the beaker in this order. The mixed solution was stirred on a magnetic stirrer for 10 minutes, and then ultrasonically dispersed for 10 minutes. After ultrasonic dispersion, 4g of epoxy resin and 2g of fluorosilicone resin were added and magnetically stirred for 25 minutes. Then, 1.2g of an epoxy resin curing agent was added and magnetically stirred for 5 minutes to obtain a well-mixed homogeneous solution. Before spraying, the glass slides are respectively placed in absolute ethyl alcohol and deionized water for ultrasonic cleaning. The uniformly mixed solution was poured into a spray can and the spray gun was sprayed against a vertically placed slide. The nozzle diameter was 1.5mm and the spray distance was kept at 15cm. The spraying pressure is controlled at 0.3MPa, and the double surfaces of the glass slide are sprayed. The sprayed coating was cured at room temperature for 1 hour and then placed in a dry box overnight. The same performance test method as the inventive example was used to test its hydrophobic and anti-icing properties, and it was measured that its contact angle was 159.7 °, sliding angle was 7.4 °, freezing time was 34 minutes, and ice adhesion strength was 94.6kPa.
Comparative example 4
The coatings prepared in example 3 and comparative examples 1-3 were each immersed in a 3.5% naoh solution, and their corrosion resistance was characterized according to the coating variation, once every 24 hours. Mottle appears after 710h of the coating prepared in example 3, mottle appears after 430h of the coating prepared in comparative example 1, mottle appears after 460h of the coating prepared in comparative example 2, and mottle appears after 420h of the coating prepared in comparative example 3.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, and it should be covered in the scope of the present application.
Claims (10)
1. A preparation method of a super-hydrophobic anti-icing coating for controlling spraying pressure is characterized by comprising the following steps of: comprising the steps of (a) a step of,
ethyl acetate, polytetrafluoroethylene and heptadecafluorodecyl trimethoxysilane are taken and put into a beaker to prepare a mixed solution A;
uniformly stirring the mixed solution A, then performing ultrasonic dispersion, and then adding epoxy resin and fluorosilicone resin, and uniformly stirring to obtain a mixed solution B;
adding an epoxy resin curing agent into the mixed solution B and uniformly stirring to obtain a mixed solution C;
pouring the mixed solution C into a spray can, spraying the spray gun aiming at the glass slide, and controlling the spraying distance and the spraying pressure;
and (3) solidifying the sprayed coating at room temperature, and drying at high temperature to obtain the super-hydrophobic anti-icing coating with the spraying pressure controlled.
2. The method of manufacturing according to claim 1, wherein: the mixed solution comprises 25g of ethyl acetate, polytetrafluoroethylene and heptadecafluorodecyl trimethoxysilane in mass ratio: 4.5g:0.8g.
3. The preparation method according to claim 1 or 2, characterized in that: and after being uniformly stirred, the mixture is subjected to ultrasonic dispersion, wherein the stirring speed is 300r/min, and the stirring time is 5-20 min.
4. A method of preparation as claimed in claim 3, wherein: the ultrasonic dispersion is carried out at the frequency of 20khz, the power of 500 watts, the operating temperature of 25 ℃ and the dispersion time of 5-20 min.
5. The method of manufacturing according to claim 1, wherein: the epoxy resin and the fluorine silicon resin are added and stirred uniformly to obtain a mixed solution B, wherein the mass ratio of the epoxy resin to the fluorine silicon resin is 4g:3g.
6. The method of manufacturing according to claim 5, wherein: the epoxy resin curing agent is added into the mixed solution B and stirred uniformly, wherein the mass ratio of the epoxy resin curing agent to the epoxy resin is 1.2g:4g.
7. The method of manufacturing according to claim 6, wherein: and the spray gun is aligned to the glass slide to spray, and the spraying distance and the spraying pressure are controlled, wherein the diameter of the spray gun nozzle is 1-2 mm, the spraying distance is 10-20 cm, and the spraying pressure is 0.1-0.5 MPa.
8. The method of manufacturing according to claim 7, wherein: and the sprayed coating is dried at a high temperature after being cured at room temperature, wherein the curing time is 1-2 h, the drying temperature is 50-90 ℃, and the drying time is 12-24 h.
9. The superhydrophobic anti-icing coating for controlling spraying pressure prepared by the preparation method according to any one of claims 1 to 8.
10. The use of a superhydrophobic anti-icing coating for controlling spray pressure according to claim 9.
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