CN111647290B - Super-hydrophobic self-cleaning coating and preparation method thereof - Google Patents
Super-hydrophobic self-cleaning coating and preparation method thereof Download PDFInfo
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- CN111647290B CN111647290B CN202010491565.XA CN202010491565A CN111647290B CN 111647290 B CN111647290 B CN 111647290B CN 202010491565 A CN202010491565 A CN 202010491565A CN 111647290 B CN111647290 B CN 111647290B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention belongs to the field of new chemical materials and functional nano materials, and provides a super-hydrophobic self-cleaning coating and a preparation method thereof2And TiO2Polydimethylsiloxane (PDMS) and sodium oleate or sodium stearate, wherein the TiO2Coated on SiO in the form of nanoparticles2An outer surface; the SiO2The particle size range of (A) is 1-10 μm; the TiO is2The particle size range of (A) is between 20 and 30 nm; SiO 22And TiO2The mass ratio range of (A) is as follows: 1: 9-3: 7; the mass of the sodium oleate or the sodium stearate is SiO2And TiO21% of the mass sum; the mass of the PDMS is SiO2‑TiO21/4 for the mass of the composite powder. The coating of the invention can be converted from high adhesion to low adhesion and has photocatalytic and self-cleaning properties.
Description
Technical Field
The invention belongs to the field of new chemical materials and functional nano materials, and particularly relates to a super-hydrophobic self-cleaning coating and a preparation method thereof.
Background
Many biological phenomena with super-hydrophobicity exist in nature, and the two most representative biological phenomena are the lotus leaf effect and the rose petal effect. The lotus leaf surface and the rose petal surface both have strong hydrophobicity, the static contact angles are larger than 150 degrees, the difference is that the lotus leaf surface has small adhesion to water drops, the water drops can easily roll off from the lotus leaf surface, and meanwhile, dust on the lotus leaf surface can be taken away to realize the purpose of self-cleaning, and the phenomenon is called as lotus leaf effect; the surface of the rose petal has strong adhesiveness to water drops, and water drops on the surface of the rose petal cannot fall off even if the petals are turned over by 180 degrees, which is the phenomenon of the rose petal effect.
The phenomenon of super-infiltration in nature attracts the attention of researchers, and the phenomenon not only has high research value, but also has high practical value. For example, a super-hydrophobic self-cleaning surface similar to a lotus leaf can be widely applied to the fields of wall coatings and the like; while a rose petal-like surface with high adhesion can be used for the non-destructive transport of micro-droplets in biology or medicine.
However, the super-hydrophobic self-cleaning coating has many problems to be solved in the practical application process. For example, in a real environment, besides dust, organic pollutants are attached to the surface of a wall coating, a general super-hydrophobic coating cannot remove the organic pollutants, and the super-hydrophobic property of the surface of the coating is gradually lost along with the continuous accumulation of the pollutants. In addition, the super-hydrophobic coating reported in the literature at present generally has the problems of complex and harsh preparation process, difficult large-scale application, high price due to the fact that organic matters containing fluorine are commonly used when the hydrophobic treatment is carried out on the surface of the coating, easy severe environmental pollution and the like. With the continuous and deep research in the field of superhydrophobicity in recent years, superhydrophobic surfaces with adjustable adhesion and photocatalytic properties have attracted more attention from researchers. Compared with a single superhydrophobic surface, the multifunctional superhydrophobic interface has higher application value.
Disclosure of Invention
The invention aims to provide a super-hydrophobic self-cleaning coating and a preparation method thereof, wherein the coating is made of SiO2And TiO2Firstly, TiO is used as raw material2Carried on SiO2Preparing a micro-nano binary structure on the surface of the microsphere, and then matching with a low surface energy substance polymerThe coating with super-hydrophobic property and high adhesion to water drops is successfully prepared by modifying dimethyl siloxane (PDMS). After the coating is irradiated by short-term ultraviolet light or sunlight or roasted at about 300-400 ℃, the hydrophobicity of the coating is further enhanced, but the adhesiveness of the surface of the coating to water is sharply reduced, water drops on the surface of the coating are easy to roll, and the coating not only has super-hydrophobic self-cleaning performance similar to lotus leaves, but also can degrade organic dye under the condition of ultraviolet irradiation. The baked coating is subjected to light treatment again, and the hydrophobicity of the coating is reduced to be in a hydrophilic state; the hydrophilic surface is restored to the super-hydrophobic state after roasting treatment, so that the super-hydrophobic state and the hydrophilic state of the coating can be reversibly transformed through roasting and illumination interactive treatment, and the adhesion and wettability can be adjusted.
"super-hydrophobic" in the present invention means that the static contact angle of a water drop on the surface of the coating is more than 150 °
The technical scheme of the invention is that the super-hydrophobic self-cleaning coating comprises SiO2And TiO2PDMS and sodium oleate or sodium stearate, wherein the TiO2Coated on SiO in the form of nanoparticles2An outer surface; the SiO2The particle size range of (A) is 1-10 μm; the TiO is2Has a particle size in the range of 20-30 nm.
Further, the above SiO2And TiO2The mass ratio range of (A) is as follows: 1: 9-3: 7; the mass of the sodium oleate or the sodium stearate is SiO2And TiO21% of the mass sum of (1); the amount of PDMS is SiO2-TiO21/4 for the mass of the composite powder.
Further, the substrate suitable for the super-hydrophobic self-cleaning coating comprises one of glass slide, wood, foam, concrete and clay brick.
The invention also provides a preparation method of the super-hydrophobic self-cleaning coating, which comprises the following steps:
(1)SiO2and TiO2Modification of (2): mixing SiO2And TiO2Respectively and independently placing the powder into two beakers, respectively adding a small amount of distilled water to disperse the powder, respectively and independently adding sodium oleate and/or sodium stearate into the two beakers, and stirring;
(2)SiO2-TiO2preparing composite powder: TiO obtained by the treatment of the step (1)2The suspension is added to SiO2Stirring in the suspension, washing with distilled water, drying, grinding to form SiO2-TiO2Composite powder;
(3) low surface energy substance modification: SiO obtained in the step (2)2-TiO2Dispersing the composite powder in absolute ethyl alcohol, then adding PDMS, and stirring to form slurry;
(4) preparing a super-hydrophobic coating: and (3) cleaning and drying the substrate to be coated, coating the slurry obtained in the step (3) on the surface of the substrate, and then drying to obtain the super-hydrophobic self-cleaning coating.
The sodium oleate or sodium stearate in the step (1) has the effect that the organic carbon chain is attached to SiO2And TiO2Surface, subsequent SiO2And TiO2The carbon chains on the surface are mutually attracted and hooked together, so that the TiO2Better loading on SiO2A surface.
Further, the preparation method of the invention also comprises a step (5) of low-adhesion treatment, wherein the method of low-adhesion treatment is to irradiate the dried coating surface in the step (4) with 300W ultraviolet light or sunlight for 5min, or to bake the dried coating surface in the step (4) in a muffle furnace at the temperature of 300-400 ℃ for 2 h.
Furthermore, when the dried coating surface obtained in the step (4) is placed in a muffle furnace at 400 ℃ and 300 ℃ for roasting for 2h in the step (5), the preparation method further comprises a treatment step (6) for converting the coating from a super-hydrophobic state to a hydrophilic state, wherein the treatment method of the step (6) is to irradiate the coating surface obtained in the step (5) with 300W ultraviolet light or sunlight for 5 min.
Still further, the preparation method of the present invention after the step (6) further comprises a treatment step (7) of restoring the coating from the hydrophilic state to the superhydrophobic state, wherein the treatment method of the step (7) is as follows: and (4) placing the coating irradiated by the 300W ultraviolet light or the sunlight in the step (6) in a muffle furnace at the temperature of 300-400 ℃ for roasting for 2 h.
Still further, the preparation method of the invention further comprises the step of repeating the treatment operations from the step (6) to the step (7) after the step (7), wherein the repetition time is 2-3 times, so that the coating is switched between a hydrophilic state and a super-hydrophobic state; when the number of repetitions is more than 3, the coating finally becomes hydrophilic, and no hydrophilic or hydrophobic state change occurs.
As can be seen from the above, the three schemes of step (5) in the present invention include: ultraviolet light, solar light and roasting. The coating in the step (6) is changed from the super-hydrophobic state to the hydrophilic state, and the coating treated by the other two schemes (ultraviolet light or solar light) cannot be changed from the super-hydrophobic state to the super-hydrophilic state, only after the roasting scheme is adopted in the step (5), the effect is achieved.
Further, the stirring time in the step (1) is 1 h; the stirring time in the step (2) is 90min, and the stirring speed is 700 rad/min; the washing times of the distilled water are 3-5 times, and the drying temperature range is as follows: 100 ℃ to 110 ℃; the addition amount of the absolute ethyl alcohol in the step (3) is SiO2-TiO25 times of the mass of the composite powder; the stirring time is 1 h; the cleaning of the substrate to be coated in the step (3) refers to ultrasonic cleaning of the surface of the substrate to be coated for 1 hour by using ethanol and distilled water.
Further, in the preparation method of the invention, in the step (4), the slurry obtained in the step (3) is coated on the surface of the substrate in one of spraying, brushing and rolling ways.
Compared with the prior art, the invention has the following beneficial effects:
(1) the super-hydrophobic self-cleaning coating disclosed by the invention is prepared by using PDMS to SiO2-TiO2The composite powder is subjected to hydrophobic modification to prepare the super-hydrophobic coating with high adhesion to water, but the adhesion of the coating to water is rapidly reduced after illumination or roasting, and meanwhile, the hydrophobicity of the coating is further enhanced, so that the coating has super-hydrophobic self-cleaning performance. In addition, under the condition of ultraviolet irradiation, the coating layer can also haveThe organic pollutants are effectively degraded;
(2) through research on various typical super-hydrophobic biological phenomena in nature, the 'micro-nano binary structure' of the surface and the biomass wax with low surface energy play a decisive role in the super-hydrophobicity of the surface. The invention is naturally learned, and micron-sized SiO with the size equivalent to the microstructure of the lotus leaf surface is selected2Microspheres and nano-sized TiO2Preparing SiO with micro-nano binary structure from particles2-TiO2And compounding the powder, and then modifying the powder by using a low-surface-energy substance PDMS (polydimethylsiloxane), so as to successfully prepare the super-hydrophobic self-cleaning surface with adjustable adhesiveness and wettability. In the process, SiO2-TiO2The micro-nano binary structure of the composite powder plays a role in structural support, and the PDMS reduces the surface energy of the coating surface, so that the coating has super-hydrophobic property. Adhesion and wettability of the coating surface to hydrophobic groups (-CH) of the coating surface3) And the number of hydrophilic groups (-OH) is directly related, and the number of the groups on the surface of the coating can be adjusted through illumination and baking, so that the adjustment of the adhesion and the wettability can be realized.
(3) Use of PDMS as SiO2-TiO2The hydrophobic agent of the composite powder is environment-friendly and nontoxic, and expands the application range of the coating.
(4) The preparation method of the coating is simple, green and environment-friendly, and can be directly sprayed on the surface of a wall in practical application, so that the surface of the wall has super-hydrophobic self-cleaning and photocatalytic properties.
The coating provided by the invention not only has super-hydrophobic performance, but also can change the adhesiveness from high to low, so that the coating has super-hydrophobic self-cleaning performance, and in addition, the coating can effectively degrade an organic dye solution, and has wide application prospects in the fields of wall coatings and the like.
Drawings
These and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows an example of super-hydrophobic materialSiO for water self-cleaning coating2、TiO2SiO in raw material and coating2-TiO2SEM image of composite powder, wherein (a) is SiO raw material2SEM picture of (a), (b) is raw material TiO2SEM pictures of (a), (b) and (c) are SiO in the coating respectively2-TiO2SEM images of the composite powder at different magnifications.
FIG. 2 shows SiO as the raw material of the super-hydrophobic self-cleaning coating in the embodiment of the present invention2、TiO2And SiO2-TiO2Composite powder and SiO2-TiO2XRD pattern of coating formed by PDMS modification of composite powder, marked SiO2-TiO2@ PDMS means SiO2-TiO2The super-hydrophobic coating is formed by the composite powder and PDMS;
FIG. 3 is a graph showing the degradation effect of various materials of the super-hydrophobic self-cleaning coating on methyl orange according to the embodiment of the invention; wherein C/C in ordinate0Representing the ratio of the concentration of methyl orange at the time t to the initial concentration;
FIG. 4 is a schematic diagram of the change effect of the wettability and the adhesiveness of the super-hydrophobic self-cleaning coating under the action of light and baking.
FIG. 5 is a comparison of wettability of a superhydrophobic self-cleaning coating and a glass slide substrate for different property droplets, where (a) shows wettability of a glass slide for different property droplets; (b) the super-hydrophobic self-cleaning coating provided by the embodiment of the invention has wettability to liquid drops with different properties;
FIG. 6 illustrates the adaptability of the superhydrophobic self-cleaning coating of the embodiment of the invention to different substrates, wherein (a) the substrate is wood, (b) the substrate is foam, (c) the substrate is concrete block, and (d) the substrate is brick.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Example 1
A preparation method of a super-hydrophobic self-cleaning coating comprises the following steps:
(1)SiO2and TiO2Modification of (2): mixing SiO2And TiO2Respectively put into two beakers, SiO2And TiO2The mass ratio of (A) to (B) is 8: 2; dispersing with small amount of distilled water, adding sodium oleate and sodium stearate in two beakers respectively, wherein the mass of sodium oleate and sodium stearate is SiO2And TiO2Stirring for 1h based on 1% of the mass; wherein the TiO is2P25 was used;
(2)SiO2-TiO2preparing composite powder: modifying the TiO2The suspension is added to SiO2Stirring vigorously for 90min in suspension, washing with distilled water for 3 times, oven drying at 105 deg.C, and grinding to obtain SiO2-TiO2Composite powder;
(3) low surface energy substance modification: mixing SiO2-TiO2Dispersing the composite powder in absolute ethyl alcohol, adding PDMS, stirring for 1h to form SiO2-TiO2@ PDMS slurries of SiO2-TiO2The mass ratio of the composite material, the absolute ethyl alcohol and the PDMS is 4:20: 1;
(4) preparing a super-hydrophobic coating: ultrasonically cleaning the glass slide in an ethanol solution for 1h, and then drying for later use; SiO is sprayed by a spraying method2-TiO2Coating the @ PDMS slurry on the surface of the cleaned glass slide, and drying at 60 ℃;
(5) low adhesion treatment: irradiating with 300W ultraviolet for 5 min.
SiO in the present example2、TiO2And SiO2-TiO2Respectively, as shown in FIGS. 1(a), (b) and (c) (d). From FIG. (a), SiO can be seen2The microspheres have smooth surfaces, the particle size is between 1 and 10 mu m, the particle size of P25 is about 20 to 30nm as shown in the graph (b), and P25 is successfully loaded on SiO as shown in the graphs (c) and (d)2The micro-nano binary structure is formed on the surface of the microsphere, and the dispersibility is better.
SiO in the present example2、TiO2、SiO2-TiO2And SiO2-TiO2XRD of @ PDMS is shown in FIG. 2: it can be seen that SiO used in the present invention2The microspheres belong to amorphous SiO2(ii) a Can be seen in P25Diffraction peaks of anatase and rutile are apparent; p25 Supported on SiO2The diffraction peaks of anatase and rutile after the surface of the microsphere are still clear and sharp, and amorphous SiO2Is masked by the diffraction peak of P25 to become a small peak, and thus it can also be seen that P25 has been successfully supported on SiO2The results are consistent with the SEM observed phenomenon on the surface of the microspheres.
The degradation effect of the coating prepared in this example on methyl orange is shown in fig. 3: due to SiO2-TiO2@ PDMS is superhydrophobic, so SiO is in the degradation process2-TiO2The @ PDMS is always suspended on the surface of the methyl orange solution and cannot be fully mixed and contacted with the reaction solution, so that the degradation effect is not P25 and SiO2-TiO2The effect is good, but the degradation rate of methyl orange can reach 88.3% after the reaction is carried out for 50 min.
The wettability of the untreated glass slide and the coating prepared in this example by light on water drops, NaOH solution, HCl solution and methyl orange drops is shown in fig. 4. As can be seen from the figure: the 4 liquid drops are almost completely spread on the surface of the untreated glass slide, which indicates that the surface of the glass slide is hydrophilic; to spray SiO2-TiO2The @ PDMS coating surface irradiated with brief ultraviolet light shows strong hydrophobicity to water, acidic solutions of water, alkaline solutions and organic dye solutions, and the liquid drops are in a rolling bead shape on the surface.
The coatings prepared in this example were sprayed on the surfaces of wood, foam, concrete block and brick, respectively, to form coatings and subjected to short UV light and the wettability of the surfaces of the coatings with respect to water droplets, NaOH solution, HCl solution and methyl orange droplets as shown in FIG. 5. As seen from the figure, SiO2-TiO2The @ PDMS is respectively sprayed on the surfaces of wood, foam, concrete blocks and bricks to form coatings, the liquid is dripped on the surfaces of the coatings after short-time ultraviolet illumination, the liquid drop is in a spherical shape, which shows that each coating is super-hydrophobic, and the liquid drop is dripped on the surface of each untreated substrate, which shows that each substrate surface is hydrophilic. The result shows that the super-hydrophobic coating prepared by the invention has strong adaptability to the substrateNamely, the self-cleaning coating can be formed on the surfaces of various materials.
Example 2
A preparation method of a super-hydrophobic self-cleaning coating comprises the following steps:
(1)SiO2and TiO2Modification of (2): mixing SiO2And TiO2Respectively put into two beakers, SiO2And TiO2The mass ratio of (A) to (B) is 8: 2; dispersing with small amount of distilled water, adding sodium stearate into the beaker, wherein the mass of the sodium stearate is SiO2And TiO2Stirring for 1h based on 1% of the mass;
(2)SiO2-TiO2preparing composite powder: modifying the TiO2The suspension is added to SiO2Stirring vigorously for 90min in suspension, washing with distilled water for 3 times, oven drying at 105 deg.C, and grinding to obtain SiO2-TiO2Composite powder;
(3) low surface energy substance modification: mixing SiO2-TiO2Dispersing the composite powder in absolute ethyl alcohol, adding PDMS, stirring for 1h to form SiO2-TiO2@ PDMS slurry. SiO 22-TiO2The mass ratio of the composite powder to the absolute ethyl alcohol to the PDMS is 4:20: 1.
(4) Preparing a super-hydrophobic coating: and ultrasonically cleaning the glass slide in an ethanol solution for 1h, and then drying for later use. Spraying SiO2-TiO2Coating the @ PDMS slurry on the surface of the cleaned glass slide, and drying at 60 ℃;
(5) low adhesion treatment: irradiating with sunlight for 5 min.
(6) After the treatment of the step (5), the adhesion of the coating to water drops is reduced sharply, and the water drops on the surface of the coating, which is inclined by 3.4 degrees, roll off; while the hydrophobicity of the coating is further enhanced, the static contact angle of the water drop on its surface increases from 151.2 ° to 158.0 °.
Example 3
(1)SiO2And TiO2Modification of (2): mixing SiO2And TiO2Respectively put into two beakers, SiO2And TiO2The mass ratio of (A) to (B) is 8: 2; using a small amount of distilled waterDispersing, adding sodium oleate into the beakers respectively, wherein the mass of the added sodium oleate is SiO2And TiO2Stirring for 1h based on 1% of the mass;
(2)SiO2-TiO2preparing composite powder: modifying the TiO2The suspension is added to SiO2Stirring vigorously for 90min in suspension, washing with distilled water for 3 times, oven drying at 105 deg.C, and grinding to obtain SiO2-TiO2Composite powder;
(3) low surface energy substance modification: mixing SiO2-TiO2Dispersing the composite powder in absolute ethyl alcohol, adding PDMS, stirring for 1h to form SiO2-TiO2@ PDMS slurry. SiO 22-TiO2The mass ratio of the composite powder to the absolute ethyl alcohol to the PDMS is 4:20: 1.
(4) Preparing a super-hydrophobic coating: and ultrasonically cleaning the glass slide in an ethanol solution for 1h, and then drying for later use. Spraying SiO2-TiO2Coating the @ PDMS slurry on the surface of the cleaned glass slide, and drying at 60 ℃;
(5) low adhesion treatment: roasting at 400 deg.c for 2 hr.
(6) After the treatment of the step (5), the adhesiveness of the coating to water drops is reduced sharply, and the water drops on the surface of the coating, which is inclined by only 2.3 degrees, can roll off; at the same time, the hydrophobicity of the coating is further enhanced, and the static contact angle of the water drop on the surface is increased from 151.2 degrees to 159.7 degrees.
(7) Hydrophilic treatment: and (5) ultraviolet irradiation is carried out for 2 hours. The contact angle of the coating was reduced from 159.7 ° to 19.2 °.
Comparison of 3 examples it can be readily seen that in example 1, two agents, sodium oleate and sodium stearate, are used for SiO2And TiO2The modification was carried out with sodium stearate in example 2 and sodium oleate in example 3. The dosage of the medicament is SiO2And TiO21% by mass. Although the agents used in the examples were different, the SiO prepared was similar in nature to sodium oleate and sodium stearate2-TiO2The composite powder and the super-hydrophobic coating prepared from the composite powder have no obvious difference in performance. Comprehensively considering the factors of preparation cost, photocatalytic effect and the likeElement of said SiO2And TiO2The optimal mass ratio of the PDMS to the ethanol is 1:4, and the mass of the PDMS to the mass of the ethanol are respectively SiO2-TiO2The mass of the composite powder is 1/4 and 5 times.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A preparation method of a super-hydrophobic self-cleaning coating is characterized by comprising the following steps:
(1)SiO2and TiO2Modification of (2): mixing SiO2And TiO2Respectively and independently placing the powder into two beakers, respectively adding a small amount of distilled water to disperse the powder, respectively and independently adding sodium oleate and/or sodium stearate into the two beakers, and stirring;
(2)SiO2-TiO2preparing composite powder: TiO obtained by the treatment of the step (1)2The suspension is added to SiO2Stirring in the suspension, washing with distilled water, drying, grinding to form SiO2-TiO2Composite powder;
(3) low surface energy substance modification: SiO obtained in the step (2)2-TiO2Dispersing the composite powder in absolute ethyl alcohol, then adding PDMS, and stirring to form slurry;
(4) preparing a super-hydrophobic coating: cleaning and drying a substrate to be coated, coating the slurry obtained in the step (3) on the surface of the substrate, and then drying to obtain the super-hydrophobic self-cleaning coating;
(5) the method of low adhesion treatment is one of the following three operations: a) irradiating the surface of the dried coating in the step (4) with 300W ultraviolet light for 5 min; b) irradiating the surface of the dried coating in the step (4) with sunlight for 5 min; c) and (5) placing the dried coating surface in the step (4) in a muffle furnace at the temperature of 300-400 ℃ for roasting for 2 h.
2. The method for preparing the superhydrophobic self-cleaning coating according to claim 1, wherein when the dried coating surface obtained in the step (4) is baked in a muffle furnace at 400 ℃ of 300 ℃ for 2h for low adhesion treatment in the step (5), the method for preparing the superhydrophobic self-cleaning coating further comprises a treatment step (6) for converting the coating from a superhydrophobic state to a hydrophilic state, and the treatment method in the step (6) is to irradiate the coating surface obtained in the step (5) with 300W ultraviolet light or sunlight for 5 min.
3. The method for preparing a superhydrophobic self-cleaning coating according to claim 2, further comprising a treatment step (7) of restoring the coating from a hydrophilic state to a superhydrophobic state after said step (6), wherein the treatment method of said step (7) is: and (4) placing the coating irradiated by the 300W ultraviolet light or the sunlight in the step (6) in a muffle furnace at the temperature of 300-400 ℃ for roasting for 2 h.
4. The method for preparing the superhydrophobic self-cleaning coating according to claim 3, further comprising repeating the processing operations of steps (6) to (7) after the step (7) for 2-3 times to switch the coating between the hydrophilic state and the superhydrophobic state; when the number of repetition is more than 3 times, the coating layer finally becomes a hydrophilic state.
5. The method of preparing a superhydrophobic self-cleaning coating of claim 1,
the stirring time in the step (1) is 1 h;
the stirring time in the step (2) is 90min, and the stirring speed is 700 rad/min; the washing times of the distilled water are 3-5 times, and the drying temperature range is as follows: 100 ℃ to 110 ℃;
the addition amount of the absolute ethyl alcohol in the step (3) is SiO2-TiO25 times of the mass of the composite powder; the stirring time is 1 h;
the cleaning of the substrate to be coated in the step (3) refers to ultrasonic cleaning of the surface of the substrate to be coated for 1 hour by using ethanol and distilled water.
6. The method for preparing the superhydrophobic self-cleaning coating according to claim 1, wherein the slurry obtained in the step (3) is applied on the surface of the substrate in the step (4) by one of spraying, brushing and rolling.
7. A super-hydrophobic self-cleaning coating is characterized in that the coating comprises SiO2And TiO2PDMS and sodium oleate or sodium stearate, wherein the TiO2Coated on SiO in the form of nanoparticles2An outer surface; the SiO2The particle size range of (A) is 1-10 μm; the TiO is2Has a particle size in the range of 20-30 nm.
8. The superhydrophobic self-cleaning coating composition of claim 7, wherein the SiO is2And TiO2The mass ratio range of (A) is as follows: 1: 9-3: 7; the mass of the sodium oleate or the sodium stearate is SiO2And TiO21% of the mass sum; the mass of the PDMS is SiO2-TiO21/4 for the mass of the composite powder.
9. The superhydrophobic self-cleaning coating composition of claim 7, suitable substrate comprising one of glass slide, wood, foam, concrete and clay brick.
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