CN110240855B - Porous super-slip anti-icing coating and preparation method thereof - Google Patents
Porous super-slip anti-icing coating and preparation method thereof Download PDFInfo
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- CN110240855B CN110240855B CN201910460120.2A CN201910460120A CN110240855B CN 110240855 B CN110240855 B CN 110240855B CN 201910460120 A CN201910460120 A CN 201910460120A CN 110240855 B CN110240855 B CN 110240855B
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Abstract
The invention discloses a porous super-slip anti-icing coating and a preparation method thereof. Firstly, performing hydrophobic modification on bentonite in a vacuum evaporation mode to obtain modified hydrophobic bentonite; then heating, stirring and mixing the polycarbonate, the polyvinyl chloride and the modified bentonite, spraying and drying to obtain the porous resin film with super-hydrophobic property; finally, silicone oil is injected into the porous structure to prepare the material. The porous super-smooth interface prepared by the method has excellent hydrophobic property, can obviously reduce the adhesion of ice, and has better anti-icing effect.
Description
Technical Field
The invention belongs to the field of new materials, and particularly relates to a porous super-slip anti-icing coating with an anti-icing effect.
Background
Inspired by the bionic lotus leaf surface, the coating with special wettability attracts wide attention in recent years. The surface which is extremely repelled by water can be applied to the fields of ice prevention, self cleaning, corrosion protection, heat transfer enhancement, underwater drag reduction and the like. The super-hydrophobic surface can be obtained by constructing a surface micron-nanometer grading mechanism and assisting with the modification of a low surface energy substance. The super-hydrophobic interface is prepared by sol-gel method, chemical vapor deposition, etching method, layer-by-layer self-assembly and other methods. However, the common disadvantage of such an interface is that the surface still freezes in an environment such as humidity condensation due to the roughness of the surface. And the ice layer and the surface rough structure form mechanical interlocking, but the adhesion of the ice layer is increased, and the anti-ice effect is lost.
Inspired by the bionic pitcher plant, a synovial fluid injection type porous interface draws attention. The interface has extremely low adhesiveness, can realize excellent pollution resistance and adhesiveness resistance, and can be used for surface anti-icing. The interface is prepared by preparing a super-hydrophobic surface with a porous and rough structure, and injecting a lubricating liquid into the interface, so that the lubricating liquid is stored in the super-hydrophobic microstructure, the solid-solid contact of the external and the interface is changed into the solid-liquid contact, and the surface adhesion is reduced. The Li Cheng group obtains an ultra-smooth interface with self-repairing function by depositing and modifying a Zn-Ni (ZN) coating on metal and injecting lubricating liquid by means of spin coating (Xiaoang, T.; Zhang, M.; Sadig, H.R.; Li, Z.; Zhang, M.; Dong, C.; Yang, L.; Chan, W.; Li, C., slit liquid-injected porous surface for correction with self-repairing property, chem.Eng.J.2018,345, 147-155.). The coating has excellent mechanical durability and better self-recovery capability, and can realize self-repair when being damaged by the outside. The Shiratiori group in Japan obtains a porous lubricating interface on the Surface of an aluminum alloy by means of Hot water soaking, modification and injection of silicone oil, and the coating has excellent biocompatibility and exhibits good Stability in a high temperature environment (Ryo Togasawa, Fumiya Ohnuki, and Seimei Shiratiori, A Biocompatible slurry Surface base on a Boehmite Nanostructure with Omniphobic for Hot Liquids and fouling Stability, ACS applied. Nano mater.2018,1, 1758-. The coatings have no large-scale preparation prospect due to high cost and complex process of the preparation mode.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the porous super-slip anti-icing coating and the preparation method thereof, the coating has excellent anti-icing performance, the adhesion of ice can be obviously reduced, and the preparation method is simple and has low cost.
The technical solution for realizing the purpose of the invention is as follows:
the porous super-slip anti-icing coating is characterized by comprising a super-hydrophobic porous resin coating and silicone oil injected into the porous structure, wherein the super-hydrophobic porous resin coating is prepared by compounding polycarbonate, polyvinyl chloride and modified bentonite.
The preparation method of the porous super-slip anti-icing coating is characterized by comprising the following steps of:
(1) placing bentonite in a high-temperature closed reaction kettle, and modifying by adopting fluorosilane, wherein the reaction temperature is 80-100 ℃;
(2) mixing the modified bentonite prepared in the step (1) with polycarbonate and polyvinyl chloride, adding heptane as a solvent, heating, stirring and dissolving, forming a film by spraying the solution at normal temperature, and drying at 50-60 ℃ to obtain a super-hydrophobic porous resin coating;
(3) and (3) injecting silicone oil into the surface of the porous resin coating prepared in the step (2) to obtain the porous super-slip anti-icing coating.
Further, in the step (1), the fluorosilane is an ethanol solution of tridecafluorooctyltrimethoxysilane, and the concentration is 0.02-0.05 mol/L.
Further, the weight ratio of fluorosilane to bentonite in the step (1) is 1: 500-600.
Further, in the step (2), the mixing weight ratio of the polycarbonate, the polyvinyl chloride, the modified bentonite and the heptane is 1: 3-5: 2-3: 8-9.
Further, the heating and stirring temperature in the step (2) is 20-30 ℃.
Further, the silicone oil in the step (3) is dimethyl silicone oil, and the injection amount is 0.002-0.005 g/cm2。
Compared with the prior art, the invention has the following remarkable advantages: 1) after the heptane solution of the modified bentonite, the polycarbonate and the polyvinyl chloride is sprayed to form a film, a porous film structure is automatically formed after drying, the contact angle of water drops on the surface can reach 155 degrees, and the water-repellent film has excellent hydrophobicity. Meanwhile, the preparation process is simple, the equipment requirement is low, and large-scale preparation can be realized; 2) the adopted raw materials have low cost and are easy to obtain; 3) the blending component of the modified bentonite and the polyvinyl chloride of the obtained coating can obviously reduce the adhesion of an ice layer, so that the adhesion of the ice layer is reduced to be below 100kPa, and an excellent anti-ice effect is achieved.
Drawings
FIG. 1 shows the contact angle of a water droplet in example 1.
FIG. 2 is the water drop contact angle of example 2.
FIG. 3 is the water drop contact angle of example 3.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
The porous super-slip anti-icing coating provided by the invention has excellent anti-icing performance and can obviously reduce the adhesion of ice. The anti-icing coating is composed of a super-hydrophobic porous resin coating and silicone oil injected into the porous structure, and the super-hydrophobic porous resin coating is prepared by compounding polycarbonate, polyvinyl chloride and modified bentonite.
The preparation method of the anti-icing coating comprises the following steps:
(1) placing bentonite in a high-temperature closed reaction kettle, and modifying by adopting 0.02-0.05 mol/L ethanol solution of fluorosilane at the reaction temperature of 80-100 ℃ to obtain modified bentonite; wherein the mass ratio of the fluorosilane solution to the bentonite is 1: 500-600.
(2) Mixing modified bentonite, polycarbonate and polyvinyl chloride, adding a proper amount of heptane as a solvent, heating and stirring at 20-30 ℃, forming a film at normal temperature by adopting a spraying mode, and drying at 50-60 ℃ to obtain a super-hydrophobic porous resin coating; wherein the mixing weight ratio of the polycarbonate, the polyvinyl chloride, the modified bentonite and the heptane is 1: 3-5: 2-3: 8-9.
(3) Injecting silicone oil 0.002-0.005 g/cm into the surface of the super-hydrophobic porous resin coating2And obtaining the porous super-slip anti-icing coating.
The present invention will be described in further detail with reference to the following examples:
example 1:
(1) placing bentonite into a stainless steel high-temperature reaction kettle, and filling a tridecafluorooctyl trimethoxy silane ethanol solution with the concentration of 0.02mol/L into a small crucible; heating the reaction kettle to a reaction temperature of 80 ℃, and taking out to obtain modified bentonite; wherein the mass ratio of the fluorosilane solution to the bentonite is 1: 550.
(2) Mixing the modified bentonite obtained in the step (1) with polycarbonate, polyvinyl chloride and heptane according to a mass ratio of 1: 3: 2: 8, mixing, heating to 25 ℃, stirring, spraying by a spray gun at normal temperature, and drying at 55 ℃ to obtain a porous resin coating;
(3) injecting 0.002g/cm dimethyl silicone oil into the resin coating prepared in the step (2) by a micro-injector2Then, a composite is obtainedAnd (4) coating.
The contact angle of a water drop of the prepared porous resin coating is 108 degrees, as shown in figure 1; the adhesion force of the ice layer on the surface of the obtained synovial fluid injection type composite coating is as high as 1000 kPa.
Example 2:
(1) placing bentonite into a stainless steel high-temperature reaction kettle, and filling a tridecafluorooctyl trimethoxy silane ethanol solution with the concentration of 0.03mol/L into a small crucible; heating the reaction kettle to 85 ℃, and taking out to obtain modified bentonite; wherein the mass ratio of the fluorosilane solution to the bentonite is 1:600
(2) Mixing the modified bentonite obtained in the step (1) with polycarbonate, polyvinyl chloride and heptane according to a mass ratio of 1: 4: 3: and 9, mixing, heating to 25 ℃, stirring, spraying by using a spray gun at normal temperature, and drying at 60 ℃ to obtain the resin coating.
(3) Injecting 0.005g/cm dimethyl silicone oil into the resin coating prepared in the step (2) by adopting a micro-injector2And then obtaining the composite coating.
The contact angle of a water drop of the prepared porous resin coating is 140 degrees, as shown in figure 1; the adhesion of the ice layer on the surface of the obtained synovial fluid injection type composite coating is 400 kPa.
Example 3:
(1) placing bentonite into a stainless steel high-temperature reaction kettle, and filling a tridecafluorooctyl trimethoxy silane ethanol solution with the concentration of 0.05mol/L into a small crucible; heating the reaction kettle to the reaction temperature of 100 ℃, and taking out to obtain modified bentonite; wherein the mass ratio of the fluorosilane solution to the bentonite is 1:500
(2) Mixing the modified bentonite obtained in the step (1) with polycarbonate, polyvinyl chloride and heptane according to a mass ratio of 1: 4: 2: 8, mixing, heating to 25 ℃, stirring, spraying by a spray gun at normal temperature, and drying at 60 ℃ to obtain a resin coating;
(3) injecting 0.004g/cm dimethyl silicone oil into the resin coating prepared in the step (2) by using a micro-injector2And then obtaining the composite coating.
The contact angle of a water drop of the prepared porous resin coating is 155 degrees, as shown in figure 3; the adhesion of the ice layer on the surface of the obtained synovial fluid injection type composite coating is 100kPa.
Comparative example:
a synovial fluid injection interface prepared as described in the background art, Slipper liquid-injected pore surface for correction protection with self-healing property, was prepared as follows:
(1) preparing a Zn-Ni (ZN) layer by adopting a deposition mode;
(2) adopting fluorosilane for modification;
(3) the lubricating liquid is injected by means of spin coating.
The experiment shows that: the coating can be obtained only on specific metal materials, and the application range is narrow; the coating is prepared by adopting a deposition mode, the process is complex, the repeatability is poor, and the prospect of large-scale preparation is not realized; the prepared coating is easy to evaporate lubricating liquid, so that the coating is ineffective; the coating prepared by the comparative example has ice surface adhesion as high as 300kPa, is much higher than the adhesion of the coating prepared by the invention, and has poor ice resistance.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (2)
1. The preparation method of the porous super-slip anti-icing coating is characterized by comprising the following steps of:
(1) placing bentonite in a high-temperature closed reaction kettle, and performing modification treatment by adopting fluorosilane, wherein the reaction temperature is 100 ℃; the weight ratio of the fluorosilane to the bentonite is 1: 500; the fluorosilane is an ethanol solution of tridecafluorooctyltrimethoxysilane, and the concentration is 0.05 mol/L;
(2) mixing the modified bentonite prepared in the step (1) with polycarbonate and polyvinyl chloride, adding heptane as a solvent, heating, stirring and dissolving, forming a film by spraying the solution at normal temperature, and drying at 60 ℃ to obtain a super-hydrophobic porous resin coating; the modified bentonite, polycarbonate, polyvinyl chloride and heptane are mixed according to the mass ratio of 1: 4: 2: 8; the heating and stirring temperature is 25 ℃;
(3) injecting 0.004g/cm of the surface of the porous resin coating prepared in the step (2)2And (4) obtaining the porous super-slip anti-icing coating by using the dimethyl silicone oil.
2. The porous super-slip anti-icing coating prepared by the method of claim 1, wherein the coating is composed of a super-hydrophobic porous resin coating and silicone oil impregnated into the porous structure; the super-hydrophobic porous resin coating is prepared by compounding polycarbonate, polyvinyl chloride and modified bentonite.
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| CN111303738B (en) * | 2020-02-02 | 2021-09-10 | 江苏大学 | Super-hydrophobic-lubricating composite anti-icing coating with porous structure and preparation method thereof |
| CN111303705B (en) * | 2020-02-02 | 2021-11-23 | 江苏大学 | Porous resin super-hydrophobic coating and preparation method thereof |
| CN111233510A (en) * | 2020-02-19 | 2020-06-05 | 南京航空航天大学 | Large-area deicing low-interface toughness porous material and preparation method thereof |
| CN111468372A (en) * | 2020-03-11 | 2020-07-31 | 西北师范大学 | Preparation method of super-wetting silicone oil type liquid perfusion surface |
| CN112898878B (en) * | 2021-03-22 | 2022-05-17 | 中山大学 | Rough substrate for a smooth porous surface impregnated with a lubricating fluid, smooth porous surface impregnated with a lubricating fluid and method for the production thereof |
| CN114955984A (en) * | 2022-05-18 | 2022-08-30 | 深圳技术大学 | Method for manufacturing ultra-smooth surface and micro-fluidic device |
| CN115353741B (en) * | 2022-09-02 | 2023-05-26 | 西南科技大学 | Preparation and application of porous PDMS (polydimethylsiloxane) impregnated organic oil gel ice-preventing and removing material |
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| CN1272114C (en) * | 2003-10-28 | 2006-08-30 | 中国科学院化学研究所 | Method for preparing super hydrophobic polymeric coating using non-crystalline polymer |
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