CN115074007B - Inorganic-organic composite super-hydrophilic coating and preparation method and application thereof - Google Patents
Inorganic-organic composite super-hydrophilic coating and preparation method and application thereof Download PDFInfo
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- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
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Abstract
The invention discloses an inorganic-organic composite super-hydrophilic coating, a preparation method and application thereof, and belongs to the technical field of coatings. The super-hydrophilic coating is prepared by adding layered silicate minerals into water, stirring at room temperature, and performing ultrasonic treatment to obtain a uniformly mixed suspension; then adding water-based polymer into the mixture, stirring the mixture in water bath at 50-90 ℃ for reaction for 2-5 hours to obtain polymer solution after intercalation modification, and then adding nano inorganic powder, dispersing agent and defoaming agent for reaction to obtain the polymer. The contact angle of the super-hydrophilic coating can reach 0 degree, and the time for reaching 0 degree is 0.5s. The inorganic-organic composite super-hydrophilic coating prepared by the invention is environment-friendly, low in cost, excellent in water resistance and ultraviolet aging resistance, good in mechanical property and binding force, and suitable for large-area construction application, and is beneficial to accelerating development and application of super-hydrophilic technology.
Description
Technical Field
The invention relates to a super-hydrophilic coating and a preparation method thereof, in particular to an inorganic-organic composite super-hydrophilic coating and a preparation method and application thereof, and belongs to the field of super-hydrophilic coatings.
Background
Wettability is the most important core in many engineering and techniques, one of which is extreme wettability-super hydrophilicity, i.e. a contact angle between liquid and film of nearly 0 degrees, and its research progress has been of great interest to the scholars. The influence acting force of the super-hydrophilic coating on water drops in the material is far greater than the tension of the surface of the material, so that the water drops are uniformly spread and form a water film, the contact between pollutants and the surface of the material is prevented, and meanwhile, the pollutants on the surface of the material can be removed by means of blowing, rain and the like, so that the self-cleaning aim is realized. Therefore, the super-hydrophilic self-cleaning coating with simple preparation conditions and excellent durability is developed, and has high application value.
Super hydrophilic coatings are classified into three major categories of organic polymer coatings, inorganic coatings and organic-inorganic composite according to chemical components.
Organic polymer super hydrophilic coatings generally refer to some natural or synthetic water-soluble polymers rich in hydrophilic functional groups, such as hydroxyl, carboxyl, amine, sulfonic acid groups, and the like. These hydrophilic groups can form hydrogen bonds with water molecules or electrostatic attraction, etc., resulting in the formation of a continuous or quasi-continuous water film layer. In the research paper "Bioinspired adhesive coatings from polyethylenimine and tannic acidcomplexes exhibiting antifogging, self-cleaning, and antibacterial capabilities (Ren JL, zhu jt. Journal OF coil AND INTERFACE science.2021.06.032volume602 Page 406-414)", the authors succeeded in depositing on the surface OF the substrate a biomimetic adhesive super-hydrophilic coating with a contact angle OF less than 10 ° by optimizing the mass ratio OF polyethylenimine to tannic acid, which coating has excellent antimicrobial activity and self-cleaning ability.
The superhydrophilic inorganic coating can be divided into two types. The first is made of inherently hydrophilic material (e.g. SiO 2 Graphene oxide, etc.) in various forms, including solid, hollow or mesoporous nanoparticles, nanoflakes, and nanorods. The second is made of, for example, tiO 2 Or a photo-induced super-hydrophilic material such as ZnO, which can reduce the contact angle to less than 10 DEG after being exposed to ultraviolet rays for a period of time to reach a super-hydrophilic state. Chinese patent application CN1687249a discloses a method for preparing super-hydrophilic coating, which coats titania sol on the surface of a substrate, and the surface shows super-hydrophilic property after high temperature calcination and ultraviolet irradiation.
The organic polymer super-hydrophilic coating has lasting and stable hydrophilic effect, but has the defects of easy swelling of the coating in water, intolerance to solvents and ultraviolet irradiation, aging resistance and poor hardness and wear resistance. Inorganic super-hydrophilic coatings, e.g. nano SiO 2 、TiO 2 High temperature calcination is often required to improve the hydrophilicity of the surface and the binding force between particles. In addition, gaps between particles are liable to absorb dust, lower surface energy and destroy the structure, making it impossible to prepare long particlesPhase stable ultra-hydrophilic coatings. Compared with other methods, the inorganic-organic composite coating has the advantages of both organic and inorganic coatings, has the advantages of supplementing each other in performance, generating a synergistic effect, and is becoming a hot spot for super-hydrophilic coating research. The Chinese patent application CN111574899A discloses an organic-inorganic hybrid anti-fog coating and a preparation method thereof, wherein acrylic ester and silica sol are mixed, and the super-hydrophilic coating with a water contact angle of 3-6 degrees is prepared by room temperature curing.
At present, the inorganic-organic super-hydrophilic coating is mainly prepared by compounding inorganic nano silicon dioxide, titanium dioxide and other powder with a hydrophilic organic solvent. However, the nano powder is in point contact with the polymer matrix, so that the interface binding force of the inorganic powder and the organic polymer is weak, the powder is easy to wear and wash away, the roughness of the coating is damaged, the mechanical properties are not ideal, and the super-hydrophilic property of the coating is not long enough to be maintained in the use environment.
Chinese patent application 202111640947.5 discloses a UV-cured super-hydrophilic anti-fog coating, and a preparation method and application thereof, wherein the coating comprises the following components in parts by weight: 30-70 parts of UV resin oligomer, 20-50 parts of acrylic monomer, 10-30 parts of surfactant and 1-5 parts of modified two-dimensional nanomaterial; the preparation raw materials of the modified two-dimensional nanomaterial comprise a two-dimensional nanomaterial and a modifier; the modifier is selected from acrylic acid modifier or acrylic ester modifier. The two-dimensional nanomaterial is selected from more than one of nanometer zirconium phosphate, modified graphene, montmorillonite, talcum powder or titanium dioxide nanosheets. However, the two-dimensional nano material and the UV resin oligomer are simply and physically mixed, chemical bonding is not formed between the powder and the polymer, the interfacial bonding force of the coating is improved only limitedly, and the mechanical property of the coating cannot be improved; moreover, this technique requires a specific ultraviolet curing technique to obtain a superhydrophilic surface, which is costly.
Disclosure of Invention
Aiming at the problems in the field of the existing super-hydrophilic coating, the coating has poor mechanical property and water resistance, and the surface micro-nano composite structure is easy to damage, so that the service life of the coating is short.
The invention also aims at providing an application of the inorganic-organic composite super-hydrophilic coating in preparing an inorganic-organic composite super-hydrophilic coating.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
an inorganic-organic composite super-hydrophilic coating is characterized in that layered silicate minerals are added into water, stirred and subjected to ultrasonic treatment at room temperature to obtain a uniformly mixed suspension; adding water-based polymer into the mixture, stirring the mixture in water bath at 50-90 ℃ for reaction for 2-5 hours to obtain polymer solution after intercalation modification, and then adding nano inorganic powder, dispersing agent and defoaming agent for reaction to obtain the polymer; the water-based polymer is any one or more of polyvinyl alcohol, polyethylene glycol and polyacrylic acid.
For further achieving the purpose of the invention, preferably, the raw material formula comprises the following components in percentage by mass: 5 to 30 percent of nano inorganic powder, 2 to 10 percent of layered silicate mineral, 5 to 15 percent of water-based polymer, 43.5 to 87.8 percent of water, 0.1 to 1 percent of dispersing agent and 0.1 to 0.5 percent of defoaming agent, wherein the sum of the mass percentages of the components is 100 percent; the nano inorganic powder is any one or more of silicon dioxide, titanium dioxide and zinc oxide.
Preferably, the size of the nano inorganic powder is 5-100 nm.
Preferably, the layered silicate mineral is any one or more of montmorillonite, mica and kaolinite.
Preferably, the mass ratio of the nano inorganic powder to the layered silicate mineral is in the range of 0.5-15: 1.
preferably, the dispersing agent is any one or more of sodium tripolyphosphate, sodium hexametaphosphate, sodium dodecyl sulfate and polyacrylamide.
Preferably, the defoamer is any one or more of silicone resin, dimethyl silicone oil and emulsified silicone oil.
The preparation method of the inorganic-organic composite super-hydrophilic coating comprises the following steps:
step 1, adding layered silicate minerals into pure water, stirring for 30-60 min at room temperature, and performing ultrasonic treatment for 15-30 min to obtain a uniformly mixed suspension;
step 2, adding an aqueous polymer into the suspension, and stirring and reacting for 2-5 hours in a water bath kettle at 50-90 ℃ to obtain a polymer solution after intercalation modification;
and step 3, sequentially adding nano inorganic powder, a dispersing agent and a defoaming agent into the polymer solution, and stirring for 30-60 min at the heating temperature of 50-90 ℃ in a water bath kettle to obtain the inorganic-organic composite super-hydrophilic coating.
The application of the inorganic-organic composite super-hydrophilic coating for preparing the inorganic-organic composite super-hydrophilic coating is characterized in that: coating the obtained inorganic-organic composite super-hydrophilic coating on the surface of a substrate by adopting a film forming process to obtain an inorganic-organic composite super-hydrophilic coating; the time required for changing the static contact angle of the obtained inorganic-organic composite super-hydrophilic coating to 0 DEG is 0.5-2s.
Preferably, the substrate is cleaned before coating and then dried for standby, and the substrate is a cement-based material, a concrete substrate or a glass substrate; sequentially ultrasonically cleaning the substrate by using acetone, ethanol and ultrapure water for more than 20 minutes; the drying is carried out in a blast drying oven with the temperature of more than 60 ℃; for a large-area substrate, drying is performed under natural conditions after the high-pressure water gun is cleaned; the film forming process is one or more of spraying, knife coating, spin coating and dip coating;
the adhesive tape of the inorganic-organic composite super-hydrophilic coating is 1-3 grades, the pencil hardness grade is H-5H, the maximum loss amount after 100 times of abrasive paper abrasion is only 6.8mg, and the surface still has super-hydrophilicity after 100 times of abrasive paper abrasion; after the coating is subjected to water and acid resistance test for one week and is placed outdoors for natural aging for 6 months, the super-hydrophilic state of the surface is maintained.
Compared with the prior art, the invention has the following advantages:
1) The invention introduces the layered silicate into the super-hydrophilic coating, and greatly improves the mechanical property and the water resistance of the composite coating due to the strong interface effect between the lamellar structure of the layered silicate and the polymer. The adhesive tape adhesion of the coating is 1-3 grades, the pencil hardness grade is H-5H, the maximum loss amount of the abrasive paper after being worn for 100 times is only 6.8mg, and the surface still has super-hydrophilicity after the mechanical wear resistant period is 100 times. The super-hydrophilic state of the surface can be maintained after one week of water resistance and acid resistance and 6 months of natural aging.
2) In general, intercalation modification is unfavorable for the super-hydrophilicity of the coating, because the higher the intercalation degree is, the favorable water resistance is for the mechanical property of the coating, but the polymer can wrap the powder, so that the roughness is reduced, and the hydrophilicity of the coating is reduced. The invention adds the layered silicate mineral into water, combines ultrasonic treatment to obtain a uniformly mixed suspension; then adding water-based polymer, strictly controlling water bath stirring reaction at 50-90 ℃ for 2-5 hours, obtaining polymer solution after intercalation modification, and the prepared coating has super-hydrophilicity and obviously improves the mechanical water resistance and other properties of the coating.
3) The hydrophilic lamellar natural minerals doped in the invention have wide sources in nature, can effectively replace part of nano inorganic powder, and reduce the cost of the coating. The dispersion and compatibility of the paint can be effectively improved by adding the paint into the aqueous solvent, and the stability of the paint is effectively improved.
4) The inorganic-organic composite super-hydrophilic coating disclosed by the invention is simple in preparation method, short in reaction time and free from complex equipment and high-temperature calcination reaction conditions.
5) The inorganic-organic composite super-hydrophilic coating prepared by the invention is environment-friendly, has low cost, is particularly suitable for large-area construction application, and is beneficial to accelerating development and application of super-hydrophilic technology.
Drawings
FIG. 1 is a graph showing the contact of the coating prepared in example 1 with water droplets.
Fig. 2 shows the contact of the coating prepared in example 2 with water droplets.
FIG. 3 is a graph showing the contact of the coating prepared in example 3 with water droplets.
Fig. 4 shows the contact of the coating prepared in example 4 with water droplets.
FIG. 5 shows the change in water contact angle value of the coating obtained in example 3 with the number of rubs of the coated abrasive.
FIG. 6 is a graph showing the relationship between contact angle and immersion time after immersing the coating obtained in example 4 in water.
Fig. 7 is an XRD pattern of the coating prepared in example 3.
Detailed Description
The invention will be further described in connection with specific embodiments, by way of illustration and explanation, but embodiments of the invention are not limited thereto.
Example 1
A preparation method of inorganic-organic composite super-hydrophilic coating comprises the following steps:
1) 10.0g of mica is accurately weighed and put into 79.8ml of deionized water to form a suspension, and stirred for 30min at room temperature and sonicated for 15min. Then, 5.0g of polyethylene glycol was added to the above solution, and the mixture was stirred in a water bath at a temperature of 80℃and a rotational speed of 1500r/min for 2 hours to form a complex solution.
2) Weighing 5.0g of nano SiO 2 The particles are dissolved in the solution, then 0.1g of sodium hexametaphosphate dispersant and 0.1g of silicone defoamer are sequentially added, the mixture is stirred in a water bath at 80 ℃ for 30min, and the super-hydrophilic composite coating for coating is obtained after ultrasonic treatment at room temperature for 15min.
3) 2ml of paint is sucked by a dropper, glass is taken as a substrate, and a spin coater with the rotating speed of 500r is used for spin coating to form a film. And finally, placing the coating in a vacuum drying oven at 60 ℃ for drying for 30min for curing to obtain the super-hydrophilic coating.
Example 2
A preparation method of an inorganic-organic super-hydrophilic coating comprises the following steps:
1) 2.0g of mica is accurately weighed and put into 62.8ml of deionized water to form suspension, and stirred for 30min at room temperature and ultrasonic for 15min. Then, 5.0g of polyethylene glycol was added to the above solution, and the mixture was stirred in a water bath at a temperature of 80℃and a rotational speed of 1500r/min for 2 hours to form a complex solution.
2) 30.0g of nano ZnO particles are weighed and dissolved in the solution, then 0.1g of sodium hexametaphosphate dispersant and 0.1g of simethicone defoamer are sequentially added, the mixture is stirred in a water bath at 80 ℃ for 30min, and the super-hydrophilic composite coating for coating is obtained after ultrasonic treatment at room temperature for 15min.
3) 2ml of paint is sucked by a dropper, glass is taken as a substrate, and a spin coater with the rotating speed of 500r is used for spin coating to form a film. And finally, placing the coating in a vacuum drying oven at 60 ℃ for drying for 30min for curing to obtain the super-hydrophilic coating.
Example 3
A preparation method of inorganic-organic composite super-hydrophilic coating comprises the following steps:
1) Accurately weighing 5.0g of montmorillonite, putting the montmorillonite into 84.8ml of deionized water to form suspension, stirring for 30min at room temperature, and carrying out ultrasonic treatment for 15min. Then, 5.0g of PVA grains was added to the above solution, and the mixture was stirred in a water bath at a temperature of 80℃and a rotational speed of 1500r/min for 2 hours to form a complex solution.
2) Weighing 5.0g of nano SiO 2 The particles are dissolved in the solution, then 0.1g of sodium dodecyl sulfate and 0.1g of dimethyl silicone oil defoamer are added in sequence, stirred for 30min in a water bath at 80 ℃, and ultrasonic is carried out for 15min at room temperature, thus obtaining the super-hydrophilic composite coating for coating.
3) 2ml of paint is sucked by a dropper, glass is taken as a substrate, and a spin coater with the rotating speed of 500r is used for spin coating to form a film. And finally, placing the coating in a vacuum drying oven at 60 ℃ for drying for 30min for curing to obtain the super-hydrophilic coating.
Example 4
A preparation method of inorganic-organic composite super-hydrophilic coating comprises the following steps:
1) Accurately weighing 5.0g of kaolin, putting the kaolin into 84.8ml of deionized water to form a suspension, stirring the kaolin for 30min at room temperature, and carrying out ultrasonic treatment for 15min. Then, 5.0g of PVA grains was added to the above solution, and the mixture was stirred in a water bath at a temperature of 80℃and a rotational speed of 1500r/min for 2 hours to form a complex solution.
2) Weighing 5.0g of nano TiO 2 The particles are dissolved in the solution, and then 0.1g of sodium tripolyphosphate dispersing agent is added in turn0.1g of silicone defoamer, stirring for 30min in a water bath at 80 ℃, and carrying out ultrasonic treatment at room temperature for 15min to obtain the super-hydrophilic composite coating for coating.
3) 2ml of paint is sucked by a dropper, glass is taken as a substrate, and a spin coater with the rotating speed of 500r is used for spin coating to form a film. And finally, placing the coating in a vacuum drying oven at 60 ℃ for drying for 30min for curing to obtain the super-hydrophilic coating.
TABLE 1
TABLE 2
Table 1 shows indexes of adhesive property and mechanical property of the substrate coatings of examples 1-4, from which the adhesive tape adhesion of the coatings is 1-3 grades, the pencil hardness grade is H-5H, and the maximum loss amount of sand paper after abrasion is 100 times is only 6.8mg, so that the super-hydrophilic coating prepared by the invention has better adhesive property and mechanical property.
Table 2 shows the initial contact angles of the substrate coatings of examples 1-4 of 3.2, 0.0, 1.2, respectively. The coating was left outdoors and the contact angle of the surface was changed to 5.0 °,0.0 °,2.1 °,3.5 ° after 6 months of natural aging process. Although there is a slight increase in the partial contact angle, the overall is still less than 5 °, and the surface still has super-hydrophilic properties.
Fig. 1 is a view showing the contact condition of the coating prepared in example 1 with water drops, and it can be seen from the figure that the prepared coating is a super-hydrophilic coating, and the contact angle of the water drops with the surface is 3.2 °.
Fig. 2 is a graph showing the contact condition of the coating prepared in example 2 with water drops, and it can be seen from the graph that the prepared coating becomes a super-hydrophilic coating, and the contact angle of the water drops with the surface is 0 deg..
Fig. 3 is a graph showing the contact condition of the coating prepared in example 3 with water drops, and it can be seen from the graph that the prepared coating becomes a super-hydrophilic coating, and the contact angle of the water drops with the surface is 0 deg..
Fig. 4 is a graph showing the contact condition of the coating prepared in example 4 with water drops, and it can be seen from the graph that the prepared coating becomes a super-hydrophilic coating, and the contact angle of the water drops with the surface is 1.2 °.
FIG. 5 shows the change in water contact angle value of the coating obtained in example 3 with the number of rubs of the coated abrasive. It can be seen that although the WCA value of the coating of example 3 tended to increase with increasing number of abrasion tests, the magnitude of the increase was relatively small, and it was rubbed 150 times with sandpaper, after which the WCA value remained 5 ° superhydrophilic. This is because the powder of the coating surface of example 3 is abraded away by a small amount, and there is substantially no micro-nano composite structure damaging the coating surface. The super-hydrophilic coating prepared by the experiment shows good mechanical wear resistance, and has practical significance for production and use of super-hydrophilic surfaces.
FIG. 6 is a graph showing the relationship between contact angle and immersion time after immersing the coating obtained in example 4 in water. The figure reflects that the coating of example 4 shows no significant change in water contact angle on the surface of the coating during 5 days of immersion in aqueous solution at ph=7 until 0 ° is reached at the end, and shows good water resistance.
According to the invention, intercalation modification is carried out by utilizing lamellar structure adsorption polymer molecules of layered silicate minerals, and as shown in figure 7, figure 7 shows an XRD pattern of a coating prepared in example 3, wherein the diffraction peak of the (001) surface of pure montmorillonite in the figure is 2θ= 5.883 degrees, d 001=1.500 nm, the diffraction peak position of montmorillonite (001) after MMT and PVA composite coating is shifted to a small angle direction at 2θ= 5.726 degrees, the interlayer distance is increased, so that PVA molecular chains are enabled to enter between MMT layers, the binding force and mechanical properties of inorganic matters and organic binders are greatly improved, so that the super-hydrophilic coating can have excellent antifouling self-cleaning performance for a long time, and the service life of the super-hydrophilic coating is greatly prolonged.
Unlike the simple physical mixing between most nanometer powder and polymer, the layered nanometer material has excellent mechanical performance owing to the intercalation reaction with polymer to form chemical bond, greatly raised interface combining force. Compared with the friction resistance of the UV cured super-hydrophilic anti-fog coating prepared by the method and the application of the coating disclosed in the Chinese patent application 202111640947.5, the super-hydrophilic coating prepared by the method and the application of the ultraviolet cured super-hydrophilic anti-fog coating can only bear the friction resistance of 10-12 times, and the super-hydrophilic coating prepared by the layered silicate intercalation modified by the method can bear the friction resistance of 150 times, still has super-hydrophilicity, greatly improves the mechanical property and prolongs the service life of the super-hydrophilic coating. As can be seen from the drawings of the above examples, the inorganic-organic composite super-hydrophilic coating prepared by the invention has excellent water resistance and good water resistance, and the coating has simple preparation process and short reaction time, and does not need complex equipment and reaction conditions of high-temperature calcination. The coating is green and environment-friendly, has low cost, is also suitable for large-area construction application, and is beneficial to accelerating the development and application of super-hydrophilic technology.
In the prior art, after the surface reaches the super-hydrophilic state by constructing roughness, the surface cannot be maintained for a long time, and the durability of the coating is poor, so that the coating cannot have good antifouling self-cleaning performance for a long time. The invention utilizes layered silicate minerals and nano inorganic powder to form a micro-nano composite structure, realizes higher roughness of the coating, and utilizes hydrophilic organic matters as binders to realize higher surface energy of the coating, thereby realizing super-hydrophilic performance of the coating. The lamellar structure of the lamellar silicate mineral is utilized to absorb polymer molecules for intercalation modification, so that the lamellar silicate mineral has better compatibility with an organic binder in the coating, thereby greatly improving the binding force of inorganic matters and the organic binder and the binding force of the coating and a matrix. The adhesive tape of the inorganic-organic composite super-hydrophilic coating prepared by the invention has the adhesion level of 1-3, the pencil hardness level of H-5H, and the contact angle between the surface and water after the abrasion period of sand paper is 100-150 times is 5-10 degrees. After the coating is soaked in water for one week, the contact angle of the surface is 0-5 degrees. The super-hydrophilic coating has excellent wear resistance, water resistance and aging resistance, so that the service life of the coating is prolonged, and the coating has long-term antifouling self-cleaning performance.
The above embodiments are not intended to limit the technical solution of the present invention in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (9)
1. An inorganic-organic composite super-hydrophilic coating is characterized in that layered silicate minerals are added into water, stirred and subjected to ultrasonic treatment at room temperature to obtain a uniformly mixed suspension; adding the water-based polymer into the mixture, stirring the mixture in a water bath at 50-90 ℃ for reaction for 2-5 hours to obtain an intercalation modified polymer solution, and then adding the nano inorganic powder, the dispersing agent and the defoaming agent for reaction to obtain the polymer; the water-based polymer is any one or more of polyvinyl alcohol, polyethylene glycol and polyacrylic acid; the layered silicate mineral is any one or more of montmorillonite, mica and kaolinite; when the inorganic-organic composite super-hydrophilic coating is applied, the inorganic-organic composite super-hydrophilic coating is coated on the surface of a matrix by adopting a film forming process, wherein the matrix is a cement-based material, a concrete matrix or a glass matrix;
the raw material formula comprises the following components in percentage by mass: 5-30% of nano inorganic powder, 2-10% of layered silicate mineral, 5-15% of water-based polymer, 43.5-87.8% of water, 0.1-1% of dispersing agent and 0.1-0.5% of defoaming agent, wherein the sum of the mass percentages of the components is 100%; the nano inorganic powder is any one or more of silicon dioxide, titanium dioxide and zinc oxide.
2. The inorganic-organic composite super-hydrophilic coating as claimed in claim 1, wherein: the size of the nano inorganic powder is 5-100 nm.
3. The inorganic-organic composite super-hydrophilic coating as claimed in claim 1, wherein: the mass ratio of the nano inorganic powder to the layered silicate mineral is in the range of 0.5-15: 1.
4. the inorganic-organic composite super-hydrophilic coating as claimed in claim 1, wherein: the dispersing agent is any one or more of sodium tripolyphosphate, sodium hexametaphosphate, sodium dodecyl sulfate and polyacrylamide.
5. The inorganic-organic composite super-hydrophilic coating as claimed in claim 1, wherein: the defoaming agent is any one or more of silicone resin, dimethyl silicone oil and emulsified silicone oil.
6. The method for preparing the inorganic-organic composite super-hydrophilic coating as claimed in any one of claims 1 to 5, comprising the steps of:
step 1, adding layered silicate minerals into pure water, stirring for 30-60 min at room temperature, and performing ultrasonic treatment for 15-30 min to obtain a uniformly mixed suspension;
step 2, adding an aqueous polymer into the suspension, and stirring and reacting for 2-5 hours in a water bath kettle at 50-90 ℃ to obtain an intercalation modified polymer solution;
and step 3, sequentially adding nano inorganic powder, a dispersing agent and a defoaming agent into the polymer solution, and stirring for 30-60 min at the heating temperature of 50-90 ℃ in a water bath kettle to obtain the inorganic-organic composite super-hydrophilic coating.
7. The use of the inorganic-organic composite super-hydrophilic coating according to any one of claims 1 to 5 for the preparation of an inorganic-organic composite super-hydrophilic coating, characterized in that: coating the obtained inorganic-organic composite super-hydrophilic coating on the surface of a substrate by adopting a film forming process to obtain an inorganic-organic composite super-hydrophilic coating; the time required for changing the static contact angle of the obtained inorganic-organic composite super-hydrophilic coating to 0 DEG is 0.5-2s.
8. The use of the inorganic-organic composite super-hydrophilic coating according to claim 7 for preparing an inorganic-organic composite super-hydrophilic coating, characterized in that: the substrate is cleaned before coating and then dried for standby, and the substrate is a cement-based material, a concrete substrate or a glass substrate; sequentially ultrasonically cleaning the substrate by using acetone, ethanol and ultrapure water for more than 20 minutes; the drying is carried out in a blast drying oven with the temperature of more than 60 ℃; the film forming process is one or more of spraying, knife coating, spin coating and dip coating;
the adhesive tape of the inorganic-organic composite super-hydrophilic coating is 1-3 grades, the pencil hardness grade is H-5H, the maximum loss amount after 100 times of abrasive paper abrasion is only 6.8mg, and the surface still has super-hydrophilicity after 100 times of abrasive paper abrasion; after the coating is subjected to water and acid resistance test for one week and is placed outdoors for natural aging for 6 months, the super-hydrophilic state of the surface is maintained.
9. The use of the inorganic-organic composite super-hydrophilic coating according to claim 8 for preparing an inorganic-organic composite super-hydrophilic coating, characterized in that: for a large-area substrate, the drying is performed under natural conditions after the high-pressure water gun is cleaned.
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| CN116622268B (en) * | 2023-04-11 | 2024-02-23 | 湖南大学 | Cellulose nanocrystalline super-hydrophilic coating, preparation method and application |
| CN116656193B (en) * | 2023-05-11 | 2024-05-07 | 东南大学 | Super-hydrophilic coating and method for forming wear-resistant and boiling-resistant super-hydrophilic coating |
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