WO2021133318A1 - Preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces - Google Patents

Preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces Download PDF

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Publication number
WO2021133318A1
WO2021133318A1 PCT/TR2020/051254 TR2020051254W WO2021133318A1 WO 2021133318 A1 WO2021133318 A1 WO 2021133318A1 TR 2020051254 W TR2020051254 W TR 2020051254W WO 2021133318 A1 WO2021133318 A1 WO 2021133318A1
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Prior art keywords
fiber matrix
process step
coating
matrix material
mixture
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PCT/TR2020/051254
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French (fr)
Inventor
Mustafa Serdar Önses
Nusret ÇELİK
İlker TÖRÜN
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T.C. Erci̇yes Üni̇versi̇tesi̇
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Priority to EP20906023.5A priority Critical patent/EP4081351A4/en
Publication of WO2021133318A1 publication Critical patent/WO2021133318A1/en

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    • 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
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups

Definitions

  • the invention relates to a preparation method of a base suitable for use under the coating so as to obtain superhydrophobic surfaces which are suitable for easy adaptation to the industrial surfaces, has increased mechanical durability and economic life and has high repellency.
  • the superhydrophobic coatings that provide many properties such as preventing corrosion, fogging, icing, contamination etc. depending on their liquid repellency properties become very popular.
  • the superhydrophobic coatings are such coatings with a contact angle of more than 150 degrees and a rolling angle of less than 10 degrees.
  • the rolling angle and contact angle have importance individually.
  • the contact angle is important so as not to spread the liquid over the surface.
  • the rolling angle is very important for immediately removing the liquid that is dropped on the surface and providing more efficient results in conditions such as icing, fogging and contamination etc. It is clear with the properties provided with these coatings that they can be used in many fields. It has a potential to be used in many fields such as aircraft and aviation industry, paper industry, ceramic industry, packaging industry, textile industry.
  • the superhydrophobic coatings have some disadvantages in their applications. The most important of these can be listed as follows; mechanical durability is not at the required level for the application and the transparency of the coating is not sufficiently high. Various studies are performed in the literature so as to eliminate these disadvantages.
  • the coating composition contains a fluorinated hydrophobic solvent, a fluorinated hydrophobic polymer and hydrophobic silica nanoparticles.
  • a superhydrophobic coating method that comprises the following process steps; reducing the surface energies by modifying the nano-sized hydrophobic particles, preparing the resin by dispersing the modified particles in the polymer matrix, dispersing the resin in a solvent environment with appropriate polarity, applying the resin-solvent mixture to the surface, heating the surface considering the curing temperature of the resin and the evaporation temperature of the solvent and that increases the adhesion of the coating on the surface where it is coated.
  • the most commonly used method for the production of the superhydrophobic coatings is to deposit nanoparticles modified with low surface energy molecules on surfaces.
  • the topography created by nanoparticles and low surface energy are combined, the superhydrophobic coatings are obtained.
  • such coatings with liquid repellency property also exhibit a very weak adhesion to the surface that they are applied.
  • it is envisaged as a solution to this is its application by mixing nanoparticles into different polymer matrixes. Unfortunately, only a partial improvement is realized with this approach.
  • the polymeric materials used cause a reduction in the water repellency of the coatings.
  • the present invention relates to a preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces which fulfills the abovementioned requirements, eliminates all disadvantages and brings some additional advantages.
  • the main aim of the invention is to develop a preparation method of a base suitable for application on a wide range of materials, including glass, textile, leather, plastic, ceramic, metal, concrete, stone, and wood surfaces.
  • Another aim of the invention is to provide superhydrophobic surfaces that benefit from the three-dimensional structure of fiber matrix materials and have improved mechanical impact resistance and water repellency.
  • the present invention is a preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces, characterized in that; it comprises the following process steps; i. Preparation of a polymeric liquid mixture ii. Placing a material with a three-dimensional fiber matrix structure to be used as a template iii. Coating said mixture on the fiber matrix material iv. Curing and cooling the mixture v. Separating the cured polymeric mixture from the surface of the fiber matrix material.
  • the invention is a preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces, characterized in that; it comprises the following process steps; i. Preparation of a polymeric liquid mixture ii. Placing a material with a three-dimensional fiber matrix structure to be used as a template iii. Coating said mixture on the fiber matrix material iv. Curing and cooling the mixture v. Separating the cured polymeric mixture from the surface of the fiber matrix material
  • the liquid mixture mentioned in the process step (i) has a thermoset structure; it preferably contains polydimethylsiloxane (PDMS).
  • the liquid mixture also contains a cross linker, namely a curing agent, preferably it comprises dimethylhydrogen siloxane according to an embodiment of the invention.
  • the ratio of PDMS and curing agent is between 10:0.5 to 10:6 by weight.
  • the material with said three dimensional fiber matrix materials can be considered as a template containing nanometric and micrometric sized gaps.
  • the fiber matrix material is selected from the group consisting of photocopy paper, stone paper, filter paper, straw paper, cardboard, fabric and templates produced by nano-production techniques In other embodiments of the invention; the fiber matrix structure can also be produced synthetically.
  • the liquid mixture is coated on the fiber matrix material and it is expected to wet this material. Therefore, it is possible to fill the liquid mixture in the micrometric/nanometric sized channels and gaps in the structure of the fiber matrix material.
  • the elastomeric film is formed after the liquid thermoset polymer is poured on the fiber matrix material.
  • the curing process mentioned in the process step (iv) is performed between 20°C to 300°C.
  • the curing temperature varies depending on the curing time. That is to say, while it can be cured for 24 hours at room temperature, it can be cured at 300°C for approximately 15 minutes.
  • the curing time and temperature can be chosen within a wide range.
  • the liquid mixture solidifies and shows elastomeric properties and takes the template form. Therefore, the three-dimensional structure of the fiber matrix material (channels, gaps, recesses and protrusions) is transferred to the elastomeric material.
  • the elastomeric material whose surface is modified in micrometric size by solidifying is preferably cooled under atmospheric conditions.
  • base is obtained by removing the cooled elastomeric material by abrading the fiber matrix material.
  • the base prepared by the inventive method is subsequently coated with a coating solution so as to obtain superhydrophobic surface.
  • the coating solution contains nanoparticles that are modified with low surface energy ( ⁇ 30 Nnr 1 ) molecules.
  • 2 grams of nanoparticles are added into 40 ml. of toluene and mixed with the help of magnetic stirring bar so as to prepare said modified nanoparticles.
  • 1 ml. of low surface energy alkyl silane, preferably dodecyltrichlorosilane is added slowly and the mixture is stirred for 3 hours. Centrifugation is carried out for 15 minutes after mixing.
  • the modified nanoparticles obtained after centrifugation are dried in an oven at 80°C temperature.
  • the drying process is preferably continued for approximately 12 hours.
  • Said nanoparticles are selected from the group consisting of hydrophilic silica, titanium dioxide, iron dioxide, zinc oxide nanoparticles. According to the most preferred embodiment, said nanoparticles are hydrophilic silica nanoparticles.
  • the coating solution is prepared by dispersing these modified nanoparticles prepared, preferably within ethanol. According to a preferred embodiment of the invention, the coating solution contains silica nanoparticles modified with alkyl silane. Accordingly, the coating solution preferably contains modified nanoparticles in a ratio of 2% by weight. Said dispersion process is provided by the vortex device.
  • the coating solution contains at least one wax selected from the group consisting of vegetable waxes, animal waxes and mineral waxes.
  • the coating solution contains carnauba.
  • carnauba is added into ethanol and mixed on the heating plate by heating the same at 120 e C.
  • the coating solution contains carnauba in a ratio of 2% by weight.
  • Coating process can be carried out by spin coating, dip coating or spray coating.
  • ethanol solution is applied on the elastomeric material by means of spray coating.
  • a spray dispenser with a 0.35 mm nozzle diameter is preferably used for spray coating.
  • the coating process is preferably performed with 4 bar pressure from a distance of 10-30 cm.
  • the coating that contains carnauba is dried, there is another process step, which includes removing the thin film layer on the surface by wearing the same with the help of aluminum foil.
  • the contact angle is approximately 140 degrees before the abrasion process, on the other hand it increases up to 168 degrees after the abrasion process.
  • the carnauba particles are provided to enter into the channels that are copied on the elastomeric material surface.
  • the inventive coating method can be applicable to any surface because there is no physical and chemical limitation on the surface of application. Glass, textiles and leather, plastic, ceramics, metal, walls, stone and wood, electronic products can be listed for these.
  • the inventive method is suitable for use in the industries such as textile, automotive, aviation, packaging, and electronics.
  • the contact angle decreased to 150° at the end of the 5 th minute and lost its high repellency property.
  • the superhydrophobic coating improved by the inventive method can still retain a very high contact angle of 175° after 10 minutes under the sa me conditions.
  • the long-term drop impact test when the water droplets freely fall from a height of 30 cm, an impact is formed on the sample surface placed at an angle of 45 e .
  • the water droplets that hit the surface at a speed of 2.801 m/s with the free fall of the drops formed an impact on the surface with a pressure effect of -3.922 kPa.
  • the superhydrophobic surfaces obtained by the inventive method showed more durability compared to the control groups.
  • Another advantage of the inventive method is that when the water repellency (contact angle) of the applied surface decreases, the water repellency property can be increased by repeating the process step (viii) with the advantage provided by the invention.
  • This property can be described as follows: The nanoparticles modified with the molecules with low surface energy by means of the morphological structure formed on the elastomeric surface are squeezed between the channels in the morphological structure and it is difficult for them to exit due to the impact applied on the surface. Therefore, the superhydrophobic surfaces obtained by the method of the invention can maintain the properties of high liquid repellency and high impact resistance.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

The invention relates to a preparation method of a base suitable for use under the coating so as to obtain superhydrophobic surfaces which are suitable for easy adaptation to the industrial surfaces, has increased durability and economic life and has high repellency, comprises the following process steps; preparing a polymeric liquid mixture (i), placing a material with a three-dimensional fiber matrix structure to be used as a template (ii), coating said liquid mixture on the fiber matrix material (iii), curing and cooling the mixture (iv), separating the cured elastomeric mixture from the surface of the fiber matrix material (v).

Description

PREPARATION METHOD OF A BASE SUITABLE FOR USE TO IMPROVE THE DURABILITY OF THE SUPERHYDROPHOBIC SURFACES
Technical Field
The invention relates to a preparation method of a base suitable for use under the coating so as to obtain superhydrophobic surfaces which are suitable for easy adaptation to the industrial surfaces, has increased mechanical durability and economic life and has high repellency.
State of the Art
Today among the technologies, the superhydrophobic coatings that provide many properties such as preventing corrosion, fogging, icing, contamination etc. depending on their liquid repellency properties become very popular. The superhydrophobic coatings are such coatings with a contact angle of more than 150 degrees and a rolling angle of less than 10 degrees. The rolling angle and contact angle have importance individually. The contact angle is important so as not to spread the liquid over the surface. The rolling angle is very important for immediately removing the liquid that is dropped on the surface and providing more efficient results in conditions such as icing, fogging and contamination etc. It is clear with the properties provided with these coatings that they can be used in many fields. It has a potential to be used in many fields such as aircraft and aviation industry, paper industry, ceramic industry, packaging industry, textile industry.
There are various methods for the application of superhydrophobic coatings. Many advantages have been provided by coating the superhydrophobic coatings using the spray coating method; thus it is widely preferred due to its advantages such as cheapness, practical application, coating over large areas, working in a wide viscosity range, etc.
Besides all these advantages, the superhydrophobic coatings have some disadvantages in their applications. The most important of these can be listed as follows; mechanical durability is not at the required level for the application and the transparency of the coating is not sufficiently high. Various studies are performed in the literature so as to eliminate these disadvantages.
For example, in the document numbered WO2019168904 in the state of the art, a superhydrophobic coating with high optical transparency is disclosed. It is mentioned that the coating composition contains a fluorinated hydrophobic solvent, a fluorinated hydrophobic polymer and hydrophobic silica nanoparticles.
In another patent document numbered TR2015/08263 in the state of the art; a superhydrophobic coating method that comprises the following process steps; reducing the surface energies by modifying the nano-sized hydrophobic particles, preparing the resin by dispersing the modified particles in the polymer matrix, dispersing the resin in a solvent environment with appropriate polarity, applying the resin-solvent mixture to the surface, heating the surface considering the curing temperature of the resin and the evaporation temperature of the solvent and that increases the adhesion of the coating on the surface where it is coated.
When the applications in the state of the art are taken into consideration; the most commonly used method for the production of the superhydrophobic coatings is to deposit nanoparticles modified with low surface energy molecules on surfaces. When the topography created by nanoparticles and low surface energy are combined, the superhydrophobic coatings are obtained. However, such coatings with liquid repellency property also exhibit a very weak adhesion to the surface that they are applied. In the state of the art, it is envisaged as a solution to this is its application by mixing nanoparticles into different polymer matrixes. Unfortunately, only a partial improvement is realized with this approach. Moreover, the polymeric materials used cause a reduction in the water repellency of the coatings.
When the current studies are taken into consideration so as to obtain superhydrophobic surfaces; it is seen that while the mechanical durability is increased, at the same time innovative methods that increase the water repellency property are still required today.
Brief Description of the Invention
The present invention relates to a preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces which fulfills the abovementioned requirements, eliminates all disadvantages and brings some additional advantages.
The main aim of the invention is to develop a preparation method of a base suitable for application on a wide range of materials, including glass, textile, leather, plastic, ceramic, metal, concrete, stone, and wood surfaces. Another aim of the invention is to provide superhydrophobic surfaces that benefit from the three-dimensional structure of fiber matrix materials and have improved mechanical impact resistance and water repellency.
In order to fulfill the above mentioned aims, the present invention is a preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces, characterized in that; it comprises the following process steps; i. Preparation of a polymeric liquid mixture ii. Placing a material with a three-dimensional fiber matrix structure to be used as a template iii. Coating said mixture on the fiber matrix material iv. Curing and cooling the mixture v. Separating the cured polymeric mixture from the surface of the fiber matrix material.
The structural and characteristic features of the present invention will be understood clearly by the following detailed description. Therefore, the evaluation shall be made by taking this detailed description into consideration.
Detailed Description of the Invention
In this detailed description, the preferred embodiments of the preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces is described only for clarifying the subject matter such that no limiting effect is created.
The invention is a preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces, characterized in that; it comprises the following process steps; i. Preparation of a polymeric liquid mixture ii. Placing a material with a three-dimensional fiber matrix structure to be used as a template iii. Coating said mixture on the fiber matrix material iv. Curing and cooling the mixture v. Separating the cured polymeric mixture from the surface of the fiber matrix material
In a preferred embodiment of the invention, the liquid mixture mentioned in the process step (i) has a thermoset structure; it preferably contains polydimethylsiloxane (PDMS). The liquid mixture also contains a cross linker, namely a curing agent, preferably it comprises dimethylhydrogen siloxane according to an embodiment of the invention. According to this embodiment, the ratio of PDMS and curing agent is between 10:0.5 to 10:6 by weight. Once again according to this embodiment, the liquid mixture is prepared by mixing PDMS and curing agent for 10 minutes in the desiccator by removing the air bubble via vacuum.
In the subsequent process step (ii), the material with said three dimensional fiber matrix materials can be considered as a template containing nanometric and micrometric sized gaps. In a preferred embodiment of the invention, materials having hierarchical structure that provides mechanical durability for the superhydrophobic coating by copying the structure of the same. These can be materials of paper structure with a nanometric/micrometric structure. In a preferred embodiment of the invention, the fiber matrix material is selected from the group consisting of photocopy paper, stone paper, filter paper, straw paper, cardboard, fabric and templates produced by nano-production techniques In other embodiments of the invention; the fiber matrix structure can also be produced synthetically.
In the process step (iii), the liquid mixture is coated on the fiber matrix material and it is expected to wet this material. Therefore, it is possible to fill the liquid mixture in the micrometric/nanometric sized channels and gaps in the structure of the fiber matrix material. According to an embodiment of the invention, the elastomeric film is formed after the liquid thermoset polymer is poured on the fiber matrix material.
In a preferred embodiment of the invention, the curing process mentioned in the process step (iv) is performed between 20°C to 300°C. The curing temperature varies depending on the curing time. That is to say, while it can be cured for 24 hours at room temperature, it can be cured at 300°C for approximately 15 minutes. The curing time and temperature can be chosen within a wide range. As a consequence of curing, the liquid mixture solidifies and shows elastomeric properties and takes the template form. Therefore, the three-dimensional structure of the fiber matrix material (channels, gaps, recesses and protrusions) is transferred to the elastomeric material. The elastomeric material whose surface is modified in micrometric size by solidifying is preferably cooled under atmospheric conditions.
In the process step (v), base is obtained by removing the cooled elastomeric material by abrading the fiber matrix material.
The base prepared by the inventive method is subsequently coated with a coating solution so as to obtain superhydrophobic surface. The coating solution contains nanoparticles that are modified with low surface energy (<30 Nnr1) molecules. According to this embodiment, 2 grams of nanoparticles are added into 40 ml. of toluene and mixed with the help of magnetic stirring bar so as to prepare said modified nanoparticles. To this homogenous mixture prepared, 1 ml. of low surface energy alkyl silane, preferably dodecyltrichlorosilane is added slowly and the mixture is stirred for 3 hours. Centrifugation is carried out for 15 minutes after mixing. The modified nanoparticles obtained after centrifugation are dried in an oven at 80°C temperature. The drying process is preferably continued for approximately 12 hours. Said nanoparticles are selected from the group consisting of hydrophilic silica, titanium dioxide, iron dioxide, zinc oxide nanoparticles. According to the most preferred embodiment, said nanoparticles are hydrophilic silica nanoparticles. In the scope of process step (vi), the coating solution is prepared by dispersing these modified nanoparticles prepared, preferably within ethanol. According to a preferred embodiment of the invention, the coating solution contains silica nanoparticles modified with alkyl silane. Accordingly, the coating solution preferably contains modified nanoparticles in a ratio of 2% by weight. Said dispersion process is provided by the vortex device.
In another embodiment of the invention; the coating solution contains at least one wax selected from the group consisting of vegetable waxes, animal waxes and mineral waxes. In a preferred embodiment, the coating solution contains carnauba. According to this embodiment; carnauba is added into ethanol and mixed on the heating plate by heating the same at 120eC. According to a preferred embodiment of the invention, the coating solution contains carnauba in a ratio of 2% by weight.
Coating process can be carried out by spin coating, dip coating or spray coating. In a preferred embodiment of the invention, ethanol solution is applied on the elastomeric material by means of spray coating. A spray dispenser with a 0.35 mm nozzle diameter is preferably used for spray coating. The coating process is preferably performed with 4 bar pressure from a distance of 10-30 cm.
According to an embodiment of the invention; after the coating that contains carnauba is dried, there is another process step, which includes removing the thin film layer on the surface by wearing the same with the help of aluminum foil. On one hand the contact angle is approximately 140 degrees before the abrasion process, on the other hand it increases up to 168 degrees after the abrasion process. Herein, at the same time, the carnauba particles are provided to enter into the channels that are copied on the elastomeric material surface. The inventive coating method can be applicable to any surface because there is no physical and chemical limitation on the surface of application. Glass, textiles and leather, plastic, ceramics, metal, walls, stone and wood, electronic products can be listed for these. The inventive method is suitable for use in the industries such as textile, automotive, aviation, packaging, and electronics.
The mechanical durability of the superhydrophobic surfaces formed by the inventive method was tested with many tests and it was seen that it is much higher compared to many other superhydrophobic surfaces in the state of the art. A few of them are as follows; water spray impact test, water jet impact test, drop impact test.
In the water spray impact test, water was sprayed at an angle of 90 “from a distance of 2.5 cm to the sample surface. The water droplets that hit the surface at a speed of 3.85 m/s created an impact on the surface with a pressure of ~ 7.41 kPa. The silicon substrate, glass and unprocessed elastomeric materials tested as a control group do not show significant durability. It is observed that the superhydrophobic coatings prepared using glass and silicon substrate lose their superhydrophobic property in 20-30th cycles and exhibit hydrophilic (<90°) property. In the coating which is unprocessed, does not have any structure, is prepared with elastomeric base, it loses its superhydrophobic property and its contact angle decreases to 130° at the end of 200 cycles. When sp ray impact test is applied under the same conditions to the superhydrophobic coating that is developed with the inventive method, namely processed, using micro-structured elastomeric material, it is observed that even at the end of 200 cycles it still preserves a very high contact angle of 170°.
In the water jet impact test, a 5.78 mm nozzle diameter tap was used to form an impact on the sample surface located under the pressurized water at an angle of 45e. The water that hit the surface at a speed of 7.4 m/s created an impact on the surface with a pressure of -27.4 kPa. As a consequence of the tests performed, the superhydrophobic coatings made using silicon, glass or unprocessed, elastomeric material that do not contain any structure did not exhibit a significant durability in this impact test. When water jet impact test was applied to the superhydrophobic coatings prepared using glass and silicon substrate, it exhibits hydrophilic (<90) property by losing its superhydrophobic property at the end of the 1st minute. In the coating prepared with unprocessed elastomeric base, the contact angle decreased to 150° at the end of the 5 th minute and lost its high repellency property. The superhydrophobic coating improved by the inventive method can still retain a very high contact angle of 175° after 10 minutes under the sa me conditions. In the long-term drop impact test, when the water droplets freely fall from a height of 30 cm, an impact is formed on the sample surface placed at an angle of 45e. The water droplets that hit the surface at a speed of 2.801 m/s with the free fall of the drops formed an impact on the surface with a pressure effect of -3.922 kPa. As a result of this test, the superhydrophobic surfaces obtained by the inventive method showed more durability compared to the control groups.
Except these tests, tests such as long-term ultrasonic cleaning, washing, and exposure to detergent were also applied and it was determined that the superhydrophobic property was maintained.
Another advantage of the inventive method is that when the water repellency (contact angle) of the applied surface decreases, the water repellency property can be increased by repeating the process step (viii) with the advantage provided by the invention. This property can be described as follows: The nanoparticles modified with the molecules with low surface energy by means of the morphological structure formed on the elastomeric surface are squeezed between the channels in the morphological structure and it is difficult for them to exit due to the impact applied on the surface. Therefore, the superhydrophobic surfaces obtained by the method of the invention can maintain the properties of high liquid repellency and high impact resistance.

Claims

1. A method to prepare of a base suitable for use to improve the durability of the superhydrophobic surfaces, characterized in that; the method comprises the following process steps; i. Preparation of a polymeric liquid mixture ii. Placing a material with a three-dimensional fiber matrix structure to be used as a template iii. Coating said liquid mixture on the fiber matrix material iv. Curing and cooling the mixture v. Separating the cured elastomeric mixture from the surface of the fiber matrix material.
2. The method according to claim 1 , characterized in that; the liquid mentioned in the process step (i) has a thermoset structure.
3. The method according to claim 1 , characterized in that; the liquid mentioned in the process step (i) comprises polydimethylsiloxane.
4. The method according to claim 3, characterized in that; the liquid also comprises curing agent.
5. The method according to claim 4, characterized in that; the curing agent is dimethylhydrogen siloxane.
6. The method according to claim 4 or 5, characterized in that; the ratio of polydimethylsiloxane and curing agent is in the range of 10:0.5 to 10:6 by weight.
7. The method according to claim 1 , characterized in that; the material having three dimensional fiber matrix material mentioned in the process step (ii) is selected from the group consisting of photocopy paper, stone paper, filter paper, straw paper, cardboard, fabric and templates produced by nano-production techniques.
8. The method according to claim 7, characterized in that; the material with three dimensional fiber matrix structure is a paper material that contains nanometric/micrometric-sized gaps.
9. The method according to claim 8, characterized in that; the material with three dimensional fiber matrix structure is a photocopy paper.
10. The method according to any of the previous claims, characterized in that; in the process step (iii), said coating is applied by forming a film by pouring the liquid mixture to fill the micrometric/nanometric sized gaps in the structure of the fiber matrix material.
11. The method according to claim 10, characterized in that; the curing process mentioned in the process step (iv) is performed between 20C° - 300C° temperature for 15 minutes to
24 hours on the heating plate.
12. The method according to any of the previous claims, characterized in that; in the process step (v), the elastomeric material to which the three-dimensional structure of the fiber matrix material is transferred in nanometric/micrometric dimension is stripped from the solid state fiber matrix material.
PCT/TR2020/051254 2019-12-27 2020-12-08 Preparation method of a base suitable for use to improve the durability of the superhydrophobic surfaces WO2021133318A1 (en)

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TR2019/22041A TR201922041A2 (en) 2019-12-27 2019-12-27 A SUITABLE BASE PREPARATION METHOD FOR INCREASE THE STRENGTH OF SUPERHYDROPHOBIC SURFACES
TR2019/22041 2019-12-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113684724A (en) * 2021-08-06 2021-11-23 广西大学 Super-stable super-hydrophobic coating and preparation method and application thereof

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KR20080102616A (en) * 2007-05-21 2008-11-26 엘에스엠트론 주식회사 Method for preparing superhydrophobic surface
US20140065906A1 (en) * 2012-09-05 2014-03-06 Samsung Electro-Mechanics Co., Ltd. Super hydrophobic membrane and method of manufacturing the same
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