CN115445894A - Preparation method and application of super-hydrophobic film - Google Patents
Preparation method and application of super-hydrophobic film Download PDFInfo
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- CN115445894A CN115445894A CN202211007293.7A CN202211007293A CN115445894A CN 115445894 A CN115445894 A CN 115445894A CN 202211007293 A CN202211007293 A CN 202211007293A CN 115445894 A CN115445894 A CN 115445894A
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- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 49
- 239000011248 coating agent Substances 0.000 claims abstract description 46
- 238000004140 cleaning Methods 0.000 claims abstract description 24
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 16
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 16
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000007822 coupling agent Substances 0.000 claims abstract description 8
- 239000003085 diluting agent Substances 0.000 claims abstract description 7
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004831 Hot glue Substances 0.000 claims abstract description 5
- 239000006185 dispersion Substances 0.000 claims abstract description 5
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 230000003373 anti-fouling effect Effects 0.000 claims abstract description 4
- 238000007865 diluting Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000011521 glass Substances 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000005406 washing Methods 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 11
- 229910021641 deionized water Inorganic materials 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 6
- 239000008399 tap water Substances 0.000 claims description 5
- 235000020679 tap water Nutrition 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000003618 dip coating Methods 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- -1 ultrasonic cleaning Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 8
- 239000003960 organic solvent Substances 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000010408 film Substances 0.000 description 39
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 21
- 239000005038 ethylene vinyl acetate Substances 0.000 description 21
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 21
- 239000000243 solution Substances 0.000 description 20
- 230000002209 hydrophobic effect Effects 0.000 description 15
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 238000002834 transmittance Methods 0.000 description 8
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- 239000007888 film coating Substances 0.000 description 4
- 238000009501 film coating Methods 0.000 description 4
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 4
- 229940012189 methyl orange Drugs 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
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- 239000002585 base Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
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- 238000002791 soaking Methods 0.000 description 2
- 241000255777 Lepidoptera Species 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
- 230000006750 UV protection Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
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- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 238000001878 scanning electron micrograph Methods 0.000 description 1
- STZCRXQWRGQSJD-UHFFFAOYSA-M sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate Chemical compound [Na+].C1=CC(N(C)C)=CC=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-UHFFFAOYSA-M 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- 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
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
- B05D3/141—Plasma treatment
- B05D3/142—Pretreatment
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
- B05D3/141—Plasma treatment
- B05D3/142—Pretreatment
- B05D3/144—Pretreatment of polymeric substrates
-
- 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
-
- 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
- B05D7/02—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 to macromolecular substances, e.g. rubber
-
- 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
- B05D7/14—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 to metal, e.g. car bodies
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
-
- 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
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
- B05D2506/15—Polytetrafluoroethylene [PTFE]
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- Life Sciences & Earth Sciences (AREA)
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- Application Of Or Painting With Fluid Materials (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
The invention provides a preparation method and application of a super-hydrophobic film, wherein the preparation method comprises the following steps: s1, dissolving EVA hot melt adhesive with tetrahydrofuran, and heating to prepare a transparent solution; s2, diluting the PTFE aqueous concentrated dispersion to obtain a PTFE diluent; then adding fumed silica, isopropanol and a coupling agent, and uniformly mixing to obtain a super-hydrophobic solution; s3, cleaning and drying the base material, and drying after the transparent solution in the coating S1 is lifted; and pulling the super-hydrophobic solution in the coating S2 and drying to obtain the super-hydrophobic film. The super-hydrophobic film has good super-hydrophobicity and low-temperature recovery, resists various common organic solvents and has good mechanical properties. The waterproof, anti-icing and antifouling multifunctional film has great application potential in the material field, the new energy field and the like.
Description
Technical Field
The invention relates to a preparation method and application of a super-hydrophobic film.
Background
Due to the recent increase in the demand for multifunctional coatings in laboratories, industries and environmental sectors. The super-hydrophobic coating is proved to be a promising candidate product due to excellent non-wettability, self-cleaning property, anti-icing property and anti-fouling property. Definition of superhydrophobicity inspiration comes from natural biological surfaces, such as lotus leaves, wings of butterflies, and the like. Such surfaces are required to achieve Water Contact Angles (WCA) greater than 150 ° and Water Sliding Angles (WSA) less than 10 °. We therefore achieved the preparation of superhydrophobic coatings by structuring the roughness structure and using low surface energy materials. However, the preparation process is complex, the materials are expensive, and the poor weather resistance is still the current problem. It is therefore desirable to explore how to increase the duration of the superhydrophobic properties of coatings over a long period of time.
Disclosure of Invention
The invention provides a preparation method and application of a super-hydrophobic film, wherein the film has certain transparency, better hydrophobic property and wear resistance.
The technical scheme of the invention is that the preparation method of the super-hydrophobic film comprises the following steps:
s1, dissolving EVA hot melt adhesive with tetrahydrofuran, and heating to prepare a transparent solution;
s2, diluting the PTFE aqueous concentrated dispersion liquid to obtain a PTFE diluent; then adding fumed silica, isopropanol and a coupling agent, and uniformly mixing to obtain a super-hydrophobic solution;
s3, cleaning and drying the base material, and drying after the transparent solution in the coating S1 is lifted; and pulling the super-hydrophobic solution in the coating S2 and drying to obtain the super-hydrophobic film.
Further, the volume ratio of the EVA hot melt adhesive to the tetrahydrofuran in the S1 is 0.2 to 0.5.
Further, heating the S1 to 60 ℃ and magnetically stirring the mixture for 30 to 60min.
Further, 60% of PTFE concentrated dispersion in S2 is diluted to a mass concentration of 10% -40% by deionized water.
Further, the volume ratio of the fumed silica, the isopropanol, the coupling agent and the PTFE diluent in S2 is 0.15 to 0.35.
Further, a coupling agent KH570 described in S2.
Further, the substrate in S3 is made of glass, aluminum or acrylic material.
Further, when S3, the substrate is cleaned, the substrate is sequentially washed by washing powder, ultrasonic cleaning, tap water cleaning, ultrasonic cleaning, ethanol cleaning and deionized water cleaning, and then is dried; and treating for 60s to 300s by using plasma equipment before coating, wherein the equipment power is 300w.
Further, when the coating is pulled up in S3, the base material is soaked into the material to be coated for 6-10min, and then the coating is pulled up at a constant speed of 500-1500 mu m/S; pulling the transparent solution to coat film and then putting the film in a baking oven at 70-120 ℃. Processing for 0.1-0.5 h; after the super-hydrophobic solution is subjected to dip coating, the coating is treated in an oven at the temperature of 100-150 ℃ for 0.2-0.6 h.
The invention also relates to application of the super-hydrophobic film prepared by the method in waterproof, anti-icing and antifouling materials.
The invention has the following beneficial effects:
according to the invention, EVA (ethylene vinyl acetate) melting and other substances are combined to form a coating, so that the coating is mechanically applied to the super-hydrophobic field, and the fumed silica nanoparticles in the coating provide a certain coarse structure so as to enable the coating to have hydrophobicity. PTFE is used as the substance with the lowest surface energy in the main substances, and provides certain low surface energy for the coating while forming a micro-nano composite structure with SiO 2. Due to the excellent chemical stability and weather resistance of PTFE, excellent acid and alkali resistance, organic corrosion resistance and ultraviolet resistance are added to the coating. One end of EVA is combined with glass, and the other end is combined with KH570 and SiO 2 And PTFE, wherein the KH570 in combination with EVA increases intermolecular forces to eliminate weak interfaces, thereby improving adhesion between EVA and SiO 2.
The super-hydrophobic film provided by the invention has the advantages of simple film coating mode, low preparation cost, environmental protection, better light transmission and durability, and certain friction resistance; the coating has good self-cleaning capability, can realize large-area coating, and has good uniformity of the coated film.
Drawings
FIG. 1 example 1 is a transmission spectrum test chart of the resulting product.
Figure 2 example 1 is the transmittance of the resulting product (7.5 x 2.5cm glass) (left uncoated right coated).
FIG. 3 example 1 shows the variation of water contact angle of the surface of the film with the number of impacts with gravel.
FIG. 4 example 1 shows the change in contact angle of the glass before and after the coating (left before coating and right after coating).
FIG. 5 example 1 is a graph of the durability of the resulting product under UVA-340 ultraviolet light tubes.
Fig. 6 example 1 is a plan SEM image of the resulting product.
FIG. 7 example 1 is a comparative self-cleaning image (no coating on top, coating on bottom) of the resulting product.
Fig. 8 example 1 is a large scale (10 x 10cm glass) coating map (bottom coated, top uncoated) of the product produced.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Example 1 super-hydrophobic treatment of glass substrate
Preparing an EVA solution: EVA and tetrahydrofuran were mixed in a 75ml weighing flask at a volume ratio of 0.2. Placing in a water bath kettle at 60 ℃, stirring for 0.5h, and taking out for later use.
Preparation of a hydrophobic modification solution: silica, 20% (mass concentration) PTFE diluent, isopropanol, KH570 were mixed in a 75ml weighing flask at 0.3.
Cleaning glass: washing glass with washing powder, ultrasonic cleaning for 10min, cleaning with tap water, ultrasonic cleaning with deionized water for 5min, adding ethanol, cleaning for 5min, and cleaning with deionized water. Drying in an oven at 60 deg.C, and treating with plasma at maximum power of 300W for 60s.
Preparing an EVA film: soaking cleaned glass in EVA solution for 10min, uniformly pulling at 1200 μm/s speed by using a dipping pulling film coating machine to obtain EVA film, and treating in a 70 deg.C oven for 0.5h;
treatment of the hydrophobic modification solution: immersing the glass coated with the EVA film in the hydrophobic modified solution again, dipping, pulling and coating the film for 10min, pulling and taking out the glass at a uniform speed of 1200 mu m/s by using a dipping, pulling and coating machine, and putting the sample into a 120 ℃ oven for processing for 1h to obtain the super-hydrophobic film.
Transmittance tests are respectively carried out on the blank glass, the glass only plated with the second layer of film and the super-hydrophobic film, and the transmittance of the transparent glass is equivalent to that of the glass only plated with the second layer of film, and the maximum transmittance reaches 90%. And after complete film coating, the transmittance in the blue light wave band range of 400nm-500nm is obviously reduced compared with that of other two sheets. The highest transmittance of 500nm-900nm can reach 86%, which is shown in figure 1. Not only ensures certain transparency, but also effectively blocks harmful blue light.
Coating 7.5cm x 3.5cm glass, and performing dip coating on only half of the glass, wherein the left side is not coated and the right side is coated. The film was visually observed for light transmittance with a white background paper. See in particular fig. 2.
The superhydrophobic thin film coated glass of example 1 was placed 40cm from a funnel and the coating was impacted with 20g grit release from the funnel, with the hydrophobic angle roll angle test being performed on the coating twice per impact. After 28 times, the hydrophobic angle of the coating is reduced from 158.8 degrees to 149.5 degrees, and the roll angle is increased from less than 1 degree to 31.58 degrees, as shown in figure 3.
The hydrophobic angle of the bare glass, 41.63 ° is shown on the left of fig. 4. The right side is the glass with the super-hydrophobic film after coating, and the hydrophobic angle is 158 degrees.
The glass of the transparent superhydrophobic film was subjected to a durability test under a UVA-340 ultraviolet lamp:
and placing the prepared product in a UVA-340 ultraviolet lamp tube to test specific values of water contact angles and transmittance on the surface of the film under different irradiation times.
1) Placing the prepared product in parallel at a position 40cm away from an UVA-340 ultraviolet lamp tube;
2) The water contact angle and the rolling angle of the film surface at different times were measured in 10 days.
The water contact angle and the rolling angle of the film surface have a descending trend with the time, but the change is small, after 60 days of irradiation, the water contact angle of the film surface is changed to 155.25 degrees, and the rolling angle is still less than 10 degrees. This test shows that the film has excellent durability, see in particular fig. 5. The super-hydrophobicity is maintained after 3 months of UVA-340 ultraviolet lamp irradiation.
FIG. 6 is a SEM topographic structure diagram of the coating layer obtained from the lower side of the scanning electron microscope at different scales and positions.
The methyl orange powder is placed on the uncoated glass (on the figure 7) and the coated glass (under the figure 7), and deionized water is sucked by a suction pipe to drip from the upper part of the glass, so that the methyl orange powder on the bare glass is completely soaked by the water drops and is left on the surface of the glass. And the methyl orange on the super-hydrophobic film glass is immediately taken away along with the rolling of water drops, so that the coating has good self-cleaning capability. See in particular fig. 7.
In order to test the practical application potential of the super-hydrophobic film, large-area lifting coating is carried out on glass of 10cm to 10cm, the prepared methyl orange solution is dripped on an uncoated part above the glass and a super-hydrophobic film part below the glass, and methyl orange water beads of a coated part (shown in figure 8) are found to be perfect spheres, so that the excellent super-hydrophobic capability is obtained. While the uncoated film (on fig. 8) was partially dropped on the glass surface. See in particular fig. 8.
Example 2 the solution was hydrophobically modified with no EVA layer, only coating.
Preparation of a hydrophobic modification solution: silica, 20% PTFE dilution, isopropanol, KH570 were mixed in a 75ml weigh flask at 0.3.
Cleaning glass: washing the glass with washing powder, then ultrasonically washing for 10min, then cleaning with tap water, then ultrasonically washing for 5min with deionized water, then adding ethanol for washing for 5min, and then cleaning with deionized water. Drying in an oven at 60 deg.C, and treating with plasma at maximum power of 300W for 60s.
Treatment of the hydrophobic modification solution: immersing the cleaned glass in the hydrophobic modified solution, dipping, pulling and coating the film for 10min, pulling and taking out the film at a uniform speed of 1200 mu m/s, and putting the sample into a 120 ℃ oven for processing for 1h.
The finished sample was impacted with 20g grit at a height of 40cm and after 1 time the coating on the abraded parts lost hydrophobicity.
Example 3 hydrophobic modification dissolution without the coupling agent KH570
Preparing an EVA solution: EVA and tetrahydrofuran were mixed in a 75ml weighing flask at a volume ratio of 0.2. Placing in a water bath kettle at 60 ℃, stirring for 0.5h, and taking out for later use.
Preparation of a hydrophobic modification solution: silica, 20% PTFE diluent, isopropanol, in a volume ratio of 0.3.
Cleaning glass: washing glass with washing powder, ultrasonic cleaning for 10min, cleaning with tap water, ultrasonic cleaning with deionized water for 5min, adding ethanol, cleaning for 5min, and cleaning with deionized water. Drying in an oven at 60 deg.C, and treating with plasma at maximum power of 300W for 60s.
Preparing an EVA film: soaking cleaned glass in EVA solution for 10min, uniformly pulling at 1200 μm/s speed by using a dipping pulling film coating machine to obtain EVA film, and treating in a 70 deg.C oven for 0.5h;
treatment of the hydrophobic modification solution: immersing the glass coated with the EVA film in the hydrophobic modified solution again, dipping, pulling and coating the film for 10min, pulling and taking out the film at a uniform speed of 1200 mu m/s by using a dipping, pulling and coating machine, and putting the sample into a 120 ℃ drying oven for processing for 1h.
The finished sample was impacted with 20g grit at a height of 40cm and after 1 time the coating on the abraded parts lost hydrophobicity.
KH570 and EVA must be present simultaneously, acting synergistically to provide the superhydrophobic coating with its good mechanical properties.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of this invention.
Claims (10)
1. A preparation method of a super-hydrophobic film is characterized by comprising the following steps:
s1, dissolving EVA hot melt adhesive with tetrahydrofuran, and heating to prepare a transparent solution;
s2, diluting the PTFE concentrated dispersion liquid to obtain a PTFE diluent; then adding fumed silica, isopropanol and a coupling agent, and uniformly mixing to obtain a super-hydrophobic solution;
s3, cleaning and drying the base material, and drying after the transparent solution in the coating S1 is lifted; and (5) pulling the super-hydrophobic solution in the coating S2 and drying to obtain the super-hydrophobic film.
2. The method of making a superhydrophobic film of claim 1, wherein: the volume ratio of the EVA hot melt adhesive to the tetrahydrofuran in the S1 is 0.2 to 0.5.
3. The method of making a superhydrophobic film of claim 1, wherein: heating the S1 to 60 ℃, and magnetically stirring for 30-60 min.
4. The method of making a superhydrophobic film of claim 1, wherein: and (3) diluting 60% of PTFE concentrated dispersion in the S2 to a mass concentration of 10% -40% by using deionized water.
5. The method of making a superhydrophobic film according to claim 4, wherein: s2, the volume ratio of the gas-phase silica to the isopropanol to the coupling agent to the PTFE diluent is 0.15 to 0.35.
6. The method of making a superhydrophobic film of claim 1, wherein: the coupling agent KH570 described in S2.
7. The method of making a superhydrophobic film of claim 1, wherein: the substrate in S3 is made of glass, aluminum or acrylic materials.
8. The method of making a superhydrophobic film according to claim 1, wherein: s3, washing the substrate by washing powder, ultrasonic cleaning, tap water cleaning, ultrasonic cleaning, ethanol cleaning and deionized water cleaning in sequence, and then drying; and treating for 60s to 300s by using plasma equipment before coating, wherein the equipment power is 300w.
9. The method of making a superhydrophobic film of claim 1, wherein: in S3, when the coating is pulled, the base material is soaked in the material to be coated for 6-10min, and then the coating is pulled at a constant speed of 500-1500 mu m/S; after the transparent solution is subjected to lifting coating, processing for 0.1-0.5 h in an oven at the temperature of 70-120 ℃; after the super-hydrophobic solution is subjected to dip coating, the coating is treated in an oven at the temperature of 100-150 ℃ for 0.2-0.6 h.
10. The use of the superhydrophobic film prepared by the method of any one of claims 1-9 in waterproof, anti-icing and antifouling materials.
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