CN113926673A - Surface hydrophobic metal framework material and preparation method thereof - Google Patents
Surface hydrophobic metal framework material and preparation method thereof Download PDFInfo
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- CN113926673A CN113926673A CN202111239671.XA CN202111239671A CN113926673A CN 113926673 A CN113926673 A CN 113926673A CN 202111239671 A CN202111239671 A CN 202111239671A CN 113926673 A CN113926673 A CN 113926673A
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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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
- B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
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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
- B05D7/14—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
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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
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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
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
- B05D2506/15—Polytetrafluoroethylene [PTFE]
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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
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
- B05D2601/22—Silica
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- Wood Science & Technology (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a preparation method of a surface hydrophobic metal framework material. The method comprises the following steps: s1, combining the metal net on the surface of the plate to form a metal frame; s2, filling a hydrophobic coating into the metal framework prepared in the step S1 to obtain the surface hydrophobic metal framework material. According to the invention, the metal frame is prepared by combining the metal mesh and the plate and is used as the base material of the hydrophobic material, and the hydrophobic material is effectively supported, so that the abrasion of the hydrophobic material is reduced, and the service life of the material is prolonged; and the shape and the aperture of the frame material microstructure can be changed by selecting different metal nets, high-precision manufacturing technology and equipment are not needed, the cost is low, and the method is suitable for large-scale popularization. The hydrophobic surface has excellent wear resistance, certain corrosion resistance and biological adhesion resistance, and the hydrophobic performance is not greatly changed even if the hydrophobic surface is used in a high-temperature environment and a strong acid and strong alkali environment for a long time, so that the hydrophobic surface can be used in various application scenes.
Description
Technical Field
The invention relates to a hydrophobic material, in particular to a metal framework material with a hydrophobic surface and a preparation method thereof.
Background
People have long generated strong interest in the super-hydrophobic phenomenon in nature, and ancient poems in China praise lotus: sludge is discharged without staining, which is probably the earliest thought to compare the self-cleaning function and the beautiful quality of human beings, which are peculiar to the super-hydrophobic phenomenon. The super-hydrophobic phenomenon refers to that a contact angle is more than 150 degrees, a rolling angle is less than 10 degrees, which is not uncommon in nature, leaves of plants such as lotus leaves and organs of animals such as water are all super-hydrophobic surfaces, and the micro-nano structures on the surfaces of the leaves and the organs are observed until a scanning electron microscope appears, so that the mechanism of the phenomenon is really explored. Today, research on superhydrophobic materials tells us two requirements necessary to build hydrophobic surfaces: the micro-nano structure has certain roughness and low surface energy.
The use of superhydrophobic surfaces is also limited by extremely fragile micro-nanostructures. There is now a solution, which was published by the dung xu team in the journal of nature in the form of a cover paper, to solve the problem of insufficient mechanical stability by putting on a superhydrophobic surface a microstructured "armor" with excellent mechanical stability. The biggest bright point of the idea lies in the design of the microstructure, and the decoupling mechanism is adopted to split the surface wettability and the mechanical stability into two different structure scales, so that the performance which cannot be obtained and combined is split, and the design purpose of 'division of labor and cooperation' is achieved. However, the manufacture of the surface frame microstructures which can be connected with each other at present can only be realized by high-precision technologies such as photoetching, coining and the like, which means that the wear-resistant super-hydrophobic surface cannot be popularized on a large scale.
Disclosure of Invention
In order to solve the problems, the invention provides a simple and easy method without high-precision equipment, and uses a regular, mutually-connectable, firm and wear-resistant metal net as a protective frame to achieve the purpose of preparing a super-hydrophobic surface with excellent mechanical stability.
In order to achieve the above object, the present invention provides a method for preparing a surface hydrophobic metal framework material, comprising the steps of:
s1, combining the metal net on the surface of the plate to form a metal frame;
s2, filling a hydrophobic coating into the metal framework prepared in the step S1 to obtain the surface hydrophobic metal framework material.
According to the invention, the metal net is combined on the surface of the plate to form a regular, connectable, firm and wear-resistant protection frame, and each mesh can effectively support the hydrophobic material, so that the wear of the hydrophobic material is reduced, and the service life of the material is prolonged. And the method is simple and easy to implement, does not need high-precision equipment, and is suitable for large-scale popularization.
Specifically, in step S1, the metal mesh and the plate may be fastened and connected by gluing, but in order to ensure the stability of the metal frame structure, the present invention adopts the following method: and placing the metal net on a plate, applying pressure, in a protective atmosphere, performing gradient temperature rise to a temperature with a lower softening point or melting point in the metal net and the plate to enable the metal net and the plate to be tightly combined, and then naturally cooling.
According to the technical scheme, the metal net and the plate are firmly combined into a whole in a heating and softening mode, so that the shock resistance of the metal net is greatly improved, and the purpose of preparing the super-hydrophobic surface with excellent mechanical stability is achieved.
And the gradient temperature rise can ensure the safety of the heat preservation equipment on one hand, and can improve the temperature rise uniformity and ensure the temperature of the use performance of the material on the other hand.
Further specifically, the pressure applied in the process of combining the metal mesh and the plate is 20-80N.
In the technical scheme, the metal net and the plate can be firmly combined by applying proper pressure, and the supporting effect of the mesh structure on the hydrophobic material can be prevented from being seriously influenced by deformation.
In step S2, the preparation method of the hydrophobic coating includes: adding 8-20 parts by mass of nano silicon dioxide into 55-72 parts by mass of a diluent, stirring until the nano silicon dioxide is uniformly dispersed, adding 20-25 parts by mass of polytetrafluoroethylene, stirring for 10-20 minutes, and performing ultrasonic dispersion for 20-40 minutes to obtain the nano silicon dioxide.
The diluent is one of ethanol, ethyl acetate and acetone.
Among the above-mentioned technical scheme, polytetrafluoroethylene has the effect that reduces surface energy and as the fixed particle of resin simultaneously, and nanometer silica is the material of structure micro-nano structure for improve roughness.
And step S2, filling the hydrophobic coating into the metal frame by adopting a spraying, blade coating or coating mode, and carrying out heat preservation and solidification to obtain the surface hydrophobic metal frame material.
In the technical scheme, the hydrophobic coating is formed to a certain thickness in the metal frame and on the surface by adopting a spraying, blade coating or coating mode so as to play a good hydrophobic role.
Specifically, the heat preservation curing conditions are as follows: curing at 200-260 ℃ for 1-3 hours.
The metal net is made of a material with strong impact resistance, preferably a copper net, an aluminum net, a nickel net, an iron net, a titanium net or an alloy net thereof and the like;
the plate is a plastic plate, a metal plate or a glass plate.
The mesh number of the metal mesh is 50-250 meshes. The mesh shape is rectangular, hexagonal, etc.
In the technical scheme, a metal net of 50-250 meshes is selected, and on one hand, the metal net has a proper space for accommodating enough hydrophobic materials so as to ensure the hydrophobicity of the frame material; on the other hand, the mechanical stability of the frame material can be ensured. The wettability is adjusted (the wettability is characterized by a contact angle and a rolling angle, because the metal net is hydrophilic, the proportion of the protective frame is large when the metal net with large mesh number is selected, the mechanical stability is improved, but the hydrophobicity is reduced, and the proportion of the hydrophobic part is large when the metal net with small mesh number is selected, the hydrophobicity is improved, but the mechanical stability is reduced) and the wear resistance are optimally combined.
The thickness of the metal net is 0.11-0.22mm, and the height of the hydrophobic coating and the height of the metal net are flush.
The invention also provides a surface hydrophobic metal framework material which is prepared by the method.
Through the technical scheme, the invention has the following beneficial effects:
1. according to the invention, the metal frame is prepared by combining the metal mesh and the plate and is used as the base material of the hydrophobic material, and the hydrophobic material is effectively supported, so that the abrasion of the hydrophobic material is reduced, and the service life of the material is prolonged; and the shape and the aperture of the microstructure of the frame material can be changed by selecting different metal nets, high-precision manufacturing technology and equipment are not needed, the cost is low, and the method is suitable for large-scale popularization.
2. Besides excellent wear resistance, the hydrophobic surface can prevent water from spreading on the surface of the material, so that H in acid and alkali is reduced+、OH-The chance that ions and other corrosive ions contact the metal material does not change the hydrophobic property greatly even if the metal material is used for a long time in a high-temperature environment and a strong acid and strong alkali environment, and the metal material can be used in various application scenes.
3. In a preferred embodiment of the invention, a regular, firm and wear-resistant protective frame which can be regularly connected can be obtained only by heating, so that the production process is simplified, and the production cost is reduced.
Drawings
FIG. 1 is the water contact angle as a function of time in an environment of 200 ℃ for an abrasion-resistant hydrophobic surface protected by a metal frame of example 1;
FIG. 2 is a graph of green algae dry weight over time in green algae solutions in which the metal framework protected abrasion resistant hydrophobic surface, the pure copper based framework, and the blank of example 1 were placed, respectively;
FIG. 3 is a graph of the water contact angle and the rolling angle of a wear-resistant hydrophobic surface protected by a metal frame made of metal meshes with different mesh numbers, which is subjected to a pressure of 1.73kPa on 800-mesh sandpaper, as a function of the friction movement distance;
FIG. 4 is a schematic representation of the contact angle and the roll angle of the superhydrophobic surface made of different metal meshes and plates;
FIG. 5 is a graph showing the contact angle and the rolling angle of superhydrophobic surfaces made of different hydrophobic coatings.
Detailed Description
The present invention is further illustrated by the following examples, it being understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
Example 1
A120 mesh copper mesh was laid tightly on the copper sheet and a pressure of 5kPa was applied. In a protective atmosphere, the temperature is increased to 1020 ℃ in a gradient manner (specifically, the temperature is increased from room temperature to 200 ℃ within 30min, the temperature is increased from 200 ℃ to 400 ℃ within 30min, the temperature is increased from 400 ℃ to 600 ℃ within 40min, the temperature is increased from 600 ℃ to 800 ℃ within 50min, the temperature is increased from 800 ℃ to 1020 ℃ within 60 min), the temperature is kept for 1h to be tightly combined, and then the metal frame capable of providing protection is obtained after natural cooling. Preparing a hydrophobic coating: according to the mass portion, 8 portions of nano silicon dioxide are added into 70 portions of diluent and stirred until the nano silicon dioxide is uniformly dispersed, 25 portions of polytetrafluoroethylene are added and stirred for 10 minutes, and ultrasonic dispersion is carried out for 30 minutes to form uniform liquid with certain viscosity. The hydrophobic coating is filled into the copper mesh microstructure framework by adopting a spraying mode to be flush with the height of each mesh of metal mesh, and the copper mesh microstructure framework is placed at 240 ℃ for 2 hours.
Fig. 1 is the water contact angle of the prepared wear-resistant hydrophobic surface protected by the metal framework in an environment of 200 ℃ along with the change of time, and the graph can show that: the surface has excellent high-temperature resistance, and can be applied to common high-temperature use scenes.
Fig. 2 is a graph of the dry weight of green algae in green algae solution with time, on which the wear-resistant hydrophobic surface protected by the metal framework of example 1, the pure copper-based framework and the blank were placed, respectively, as can be seen from fig. 2: after 108 hours, the dry weight of the pure green algae solution without any sample is the largest, the solution for soaking the surface hydrophobic metal framework material is the next to the solution for soaking the surface hydrophobic metal framework material is the smallest, which shows that the capacity of resisting green algae adhesion of the metal framework material after hydrophobic treatment is improved, the green algae in the solution is heavy in dry weight, and the adhesion amount of the green algae on the surface of the material is small.
Example 2
The influence of the use of 0 mesh, 50 mesh, 150 mesh and 250 mesh copper mesh on the properties of the frame material was examined under the same conditions as in example 1. The specific method comprises the following steps: the abrasion-resistant hydrophobic surface protected by the metal frame is placed on 800-mesh sandpaper, the pressure of the sandpaper is 1.73kPa, the change of the water contact angle and the rolling angle along with the friction moving distance is observed, and the experimental result is shown in figure 3. As can be seen in fig. 3: when the friction cycle reaches 15 times, namely the friction distance is 15m, the contact angle of the super-hydrophobic surface with the copper mesh protective frame is reduced less than that of the non-copper mesh protective frame, and the reduction is the least when the 120-mesh copper mesh is used as the protective frame, which indicates the excellent wear resistance.
Example 3
Other conditions were the same as in example 1, and the sizes of the contact angle and the roll angle of the superhydrophobic surface made of different metal meshes and plates were examined, and the results are shown in fig. 4. As can be seen in fig. 4: the contact angle of the coating without metal mesh protection is reduced to the maximum extent, so that the use requirement cannot be met, and the titanium mesh-copper plate has the best wear resistance in various metal protection frames.
TABLE 1 preparation of surface-hydrophobic Metal Framing Material for different Metal meshes and plates
Example 4
The contact angle and the roll angle of the superhydrophobic surface prepared by the hydrophobic coating with different formulations were examined under the same conditions as in example 1, and the results are shown in fig. 5. As can be seen from fig. 5: as the fraction of silica particles increases, the water contact angle of the abrasion resistant surface gradually increases.
TABLE 2 preparation of surface hydrophobic Metal Framing Material with different hydrophobic coatings
The preferred embodiments of the present invention have been described in detail with reference to the examples, but the present invention is not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that, in the foregoing embodiments, various technical features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present invention are not described separately.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A preparation method of a surface hydrophobic metal framework material is characterized by comprising the following steps:
s1, combining the metal net on the surface of the plate to form a metal frame;
s2, filling a hydrophobic coating into the metal framework prepared in the step S1 to obtain the surface hydrophobic metal framework material.
2. The method for preparing the surface hydrophobic metal framework material as claimed in claim 1, wherein in step S1, the method for combining the metal mesh and the plate material is as follows: and placing the metal net on the plate, applying pressure, in a protective atmosphere, performing gradient temperature rise to a temperature with a lower softening point or melting point in the metal net and the plate to enable the metal net and the plate to be tightly combined, and then naturally cooling.
3. The method for preparing the surface hydrophobic metal framework material as claimed in claim 2, wherein the pressure applied during the bonding of the metal mesh and the plate material is 20-80N.
4. The method for preparing the surface hydrophobic metal framework material according to claim 1, wherein in step S2, the method for preparing the hydrophobic coating is as follows: adding 8-20 parts by mass of nano silicon dioxide into 55-72 parts by mass of a diluent, stirring until the nano silicon dioxide is uniformly dispersed, adding 20-25 parts by mass of polytetrafluoroethylene, stirring for 10-20 minutes, and performing ultrasonic dispersion for 20-40 minutes to obtain the nano silicon dioxide.
5. The method for preparing the surface hydrophobic metal framework material according to claim 1, wherein in step S2, the hydrophobic coating is filled into the metal framework by spraying, blade coating or coating, and the surface hydrophobic metal framework material is obtained by heat preservation and solidification.
6. The method for preparing the surface hydrophobic metal framework material according to claim 5, wherein the heat-preservation curing conditions are as follows: curing at 200-260 ℃ for 1-3 hours.
7. The method for preparing the surface hydrophobic metal framework material according to any one of claims 1 to 6, wherein the metal mesh is a copper mesh, an aluminum mesh, a nickel mesh, an iron mesh, a titanium mesh or an alloy mesh thereof, and the plate is a plastic plate, a metal plate or a glass plate.
8. The method for preparing the surface hydrophobic metal framework material according to any one of claims 1 to 6, wherein the mesh number of the metal mesh is 50-250 meshes.
9. The method of preparing a surface hydrophobic metal framework material according to any of claims 1 to 6, wherein the thickness of the metal mesh is 0.11-0.22 mm.
10. A surface hydrophobic metal framing material made by the method of any one of claims 1 to 9.
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| CN202111239671.XA CN113926673A (en) | 2021-10-25 | 2021-10-25 | Surface hydrophobic metal framework material and preparation method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180326452A1 (en) * | 2017-05-10 | 2018-11-15 | Metamaterial Technologies Usa, Inc. | Self-cleanable transparent conductive surface/film |
| WO2019155446A1 (en) * | 2018-02-12 | 2019-08-15 | Ypf Tecnología S.A. | Method of preparation of new super-hydrophobic membranes and membranes obtained by said method |
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2021
- 2021-10-25 CN CN202111239671.XA patent/CN113926673A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180326452A1 (en) * | 2017-05-10 | 2018-11-15 | Metamaterial Technologies Usa, Inc. | Self-cleanable transparent conductive surface/film |
| WO2019155446A1 (en) * | 2018-02-12 | 2019-08-15 | Ypf Tecnología S.A. | Method of preparation of new super-hydrophobic membranes and membranes obtained by said method |
Non-Patent Citations (2)
| Title |
|---|
| 丁元迪等: "金属基体上超疏水表面的制备及其机械耐久性的研究进展", 《表面技术》 * |
| 谢剑: "管内及表面冷凝相分布调控实验研究", 《中国博士学位论文全文数据库 工程科技II辑》 * |
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