CN112794649B - Antifogging film and preparation method thereof - Google Patents
Antifogging film and preparation method thereof Download PDFInfo
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- CN112794649B CN112794649B CN202110185734.1A CN202110185734A CN112794649B CN 112794649 B CN112794649 B CN 112794649B CN 202110185734 A CN202110185734 A CN 202110185734A CN 112794649 B CN112794649 B CN 112794649B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
- C03C17/3405—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of organic materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2217/00—Coatings on glass
- C03C2217/70—Properties of coatings
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2218/00—Methods for coating glass
- C03C2218/10—Deposition methods
- C03C2218/11—Deposition methods from solutions or suspensions
- C03C2218/111—Deposition methods from solutions or suspensions by dipping, immersion
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2218/00—Methods for coating glass
- C03C2218/10—Deposition methods
- C03C2218/11—Deposition methods from solutions or suspensions
- C03C2218/116—Deposition methods from solutions or suspensions by spin-coating, centrifugation
Abstract
The invention belongs to the technical field of film material preparation, and particularly relates to a preparation method of an antifogging film with excellent wear resistance, which comprises the steps of dissolving methoxysilane in water, adding acetic acid, uniformly stirring under the action of a magnetic rotor, and standing for later use; soaking the glass sheet treated by the oxygen plasma in the solution for several hours, and then drying for later use; dissolving acrylamide, bisacrylamide, a persulfate, tetramethylethylenediamine and calcium ions in water, and uniformly mixing a certain volume of the solution with polyvinyl alcohol; and (3) spin-coating a certain volume of the mixed solution on a treated substrate by using a spin coater, and drying after spin-coating. The method adopts a simple spin-coating method to prepare the antifogging film with excellent wear resistance, has the advantages of simple and easy operation process, wide application range, controllable reaction conditions, low raw material cost and the like, has no pollution to the environment, has good binding force, and does not influence the light transmittance of the original substrate material while ensuring the antifogging effect.
Description
Technical Field
The invention belongs to the technical field of film material preparation, and particularly relates to a preparation method for coating a film on the surface of a substrate such as glass and the like and enabling the substrate to have excellent wear resistance and antifogging property.
Background
People often come into contact with glass in everyday life and production, such as windshields of vehicles, rear-view mirrors, bathroom mirrors, windows of buildings, solar panels, and the like. However, under certain temperature and humidity conditions, water vapor in the air can be condensed together to form tiny water drops on the glass surface, so that the fogging phenomenon can easily occur, and the refraction and reflection phenomena of light can be caused due to the existence of the small water drops. Under some circumstances, the atomizing phenomenon can cause certain influence to people's life and production, for example can influence vehicle driver's sight, leads to can't see through glass and sees the object in the place ahead clearly to cause serious harm to driving safety.
The current methods for eliminating the atomization phenomenon mainly comprise two methods: the first is that from the thermodynamic point of view, the water droplets condensed from water vapor under specific conditions are evaporated in a short time by the heat energy. The second method is to treat the surface of the substrate from the surface chemical composition and structure of the material, so as to change the chemical composition and structure of the glass surface, thereby changing the wetting state of the glass surface and achieving the hydrophilic or hydrophobic antifogging effect. The heating method is used for achieving the anti-fog purpose, the time is often long, the practical performance is limited to a certain degree, and the heating device is complex to install, high in cost and not beneficial to large-scale application. Therefore, most researchers often consider changing the wettability of the substrate material, which can be started from two aspects, namely, hydrophilizing the surface of the material, rapidly and uniformly spreading the liquid on the solid surface, and forming a water film on the surface of the material by water drops, so that the phenomena of scattering and refraction of the water drops on the light are eliminated, and the anti-fog effect is achieved. On the other hand, the surface of the material is hydrophobized, the contact angle of water drops is increased, and the water drops fall off under the action of the gravity of the water drops, so that the antifogging effect is achieved. However, many hydrophobic or super-hydrophobic systems contain silicon, fluorine and other components, so that the adhesion capability of the materials is poor, the firmness is poor, and the fluorine-containing compounds pollute the environment to a certain extent.
Therefore, the study of wear-resistant antifoggingThe film has a greater prospect, and for the application, the antifogging film with certain wear resistance is prepared by a spin-coating method, the antifogging film has good film-forming property, low price and lasting antifogging property, and the light transmittance of the original glass is not influenced after the film is coated. CN 103664004B discloses an antifogging coating, a preparation method of the antifogging coating and antifogging glass, but the surface hydroxylation treatment modes are different, and the curing temperature ranges are different; the steps of hydroxylation, cross-linking and antifogging are required to be carried out in multiple steps. The solvent used in the invention is deionized water, so that the invention is more environment-friendly; and with the use of H2O2And concentrated H2SO4Compared with the method for hydroxylation by using the mixed solution, the method is safer and more effective by using oxygen plasma, has lower temperature range for curing and is more convenient to operate. CN 104086093B discloses an antifogging coating and a manufacturing method thereof, and antifogging glass compared with the invention, the pretreatment of common glass in the invention does not need physical polishing, and the operation is simpler and more convenient; organic solvents of acetone and tetrahydrofuran are not used, so that the method is more environment-friendly, and the heat treatment does not need to be carried out under a vacuum condition, so that the operation is convenient; besides glass and PC plates, the glass can also be applied to PET and PVC plates, and the application range is wider.
Disclosure of Invention
The invention aims to provide a preparation method of an anti-fog film with wear resistance, which adopts a spin-coating method to uniformly spread a solution on a glass sheet and dry the solution to prepare the anti-fog film with wear resistance, and solves the problems of complex operation process and poor mechanical property in the preparation of an anti-fog surface. The prepared antifogging film layer has no pollution and toxicity to the environment, and has the advantages of lasting antifogging property, good wear resistance and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of an antifogging film with wear resistance comprises the following specific steps:
(1) preparing a precursor solution with a certain concentration
Dissolving a certain mass of methoxysilane in water, adding a small amount of acetic acid, stirring uniformly under the action of a magnetic rotor, and standing for later use;
(2) soaking and drying
Soaking the substrate sheet in the mixed solution prepared in the step (1) for several hours, then placing the substrate sheet in an oven for drying, and storing the substrate sheet at room temperature for later use;
(3) preparing solution
Dissolving a certain mass of acrylamide, bisacrylamide, sulfide, tetramethylethylenediamine and calcium ions in water, and uniformly mixing a certain volume of the solution with polyvinyl alcohol;
(4) spin coating and drying
And (3) spin-coating a certain volume of the mixed solution on the treated substrate sheet by using a spin coater, taking out the substrate sheet after the spin coating is finished, and drying the substrate sheet, thereby obtaining the antifogging film layer with excellent wear-resisting property.
Further, the specific steps of preparing the precursor solution with a certain concentration in the step (1) include weighing 0.1-5 g of methoxysilane to be dissolved in 100mL of water, weighing 5-40 muL of acetic acid, and magnetically stirring for 3-12 hours until the methoxysilane is completely dissolved.
Further, the substrate sheet in the step (2) is any one of glass, PC, PET and PVC, preferably a glass sheet treated by oxygen plasma, wherein the specific steps comprise oxygen plasma treatment for 1-10 min at-101.4 kPa.
Further, the substrate sheet in the step (2) is soaked in the mixed solution prepared in the step (1) for 1-8 hours.
Further, the step (3) comprises the following specific steps: firstly, adding calcium ions, acrylamide and water, then adding bisacrylamide and tetramethylethylenediamine, and finally adding a sulfide under the ice bath condition while stirring; after the preparation, the mixed solution is uniformly mixed with 1 to 15 wt% of polyvinyl alcohol according to the volume ratio of 1:1 to 8:1 after ultrasonic dispersion. The concrete raw materials in the step (3) are as follows: 1-10 g of acrylamide, 1-10 mg of bisacrylamide, 2-12 mg of persulfate, 1-15 g of calcium ions and 5-30 mu L of tetramethylethylenediamine.
Further, the spin-coating speed in the step (4) is 500-2500 r/min, and the spin-coating time is 5-20 s.
Further, the drying temperature range in the step (4) is 50-100 ℃.
Further, the drying time in the step (4) is 1-20 h.
Methoxysilane generates silane in an acidic aqueous solution environment, hydrogen bonds between oxide on the surface of glass and the silane become chemically stable siloxane bonds after water is removed, acrylamide is used as a monomer, bisacrylamide is used as a cross-linking agent, a polysulfide is used as an initiator, tetramethylethylenediamine is used as a reducing agent, and the redox system is formed by the methoxysilane and the polysulfide, so that polymerization can be initiated at a low temperature. The long-chain polymer network of polyacrylamide is covalently crosslinked to silane on various solid modified surfaces, and then forms a double-network structure through the action of the silane and polyvinyl alcohol, so that the wear resistance of the film layer is improved.
The invention adopts acrylamide monomer to form an interactive network structure through the action of cross-linking agent, initiator, reducing agent and the like, and the prepared film has hydrophilic group amino, which can quickly absorb water molecules in the air into the coating, and the water vapor is not condensed into small water drops on the surface of the substrate, but forms a layer of uniform water film. Therefore, the atomization phenomenon caused by refraction and diffuse reflection of the transmitted light due to different curvature radiuses of the small water drops is eliminated, and the anti-fog purpose is achieved.
The invention has the advantages that:
(1) the spin-coating method is adopted to uniformly spread the solution on the substrate sheet and dry the substrate sheet to prepare the wear-resistant antifogging film, the preparation process is simple, the operation is convenient, the prepared antifogging film has good wear resistance, and the light transmittance test result shows that when the substrate is glass, the antifogging coating has little influence on the light transmittance of the glass, the coated glass can still keep about 90% of light transmittance, and the problems of complex preparation process, long time consumption, poor stability and the like of a plurality of traditional methods are solved.
(2) The raw materials used in the method are environment-friendly and pollution-free, the coating can be placed for a long time after being dried, and water vapor is absorbed by the film layer to achieve the anti-fog effect.
(3) The method can also coat antifogging coatings on other substrates according to actual needs, such as PC, PVC, PET materials and the like, can realize good antifogging effect, and does not influence the original light transmittance of the materials.
Drawings
FIG. 1 is an ultraviolet spectrum (a) and an optical picture (b) of an antifogging film with wear resistance and an antifogging effect picture (c) on different substrates according to the present invention;
FIG. 2 is a picture showing the times of peeling the tape and the different mass loads on the surface of an anti-fog film with wear resistance (a), the times of rubbing the sand paper (b) and the anti-fog effect;
FIG. 3 is a surface topography view (a), inset is a contact angle display, and cross-sectional view display (b) of an anti-fog film with abrasion resistance of the present invention;
fig. 4 is a lasting performance display of an anti-fog film with wear resistance of the invention.
Detailed Description
The invention provides a preparation method of an antifogging film with wear resistance, which comprises the following steps:
(1) preparing a precursor solution with a certain concentration
(2) Soaking and drying
(3) Preparing solution
(4) Spin coating and drying
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
The method comprises the following steps: preparing a precursor solution with a certain concentration
In one embodiment, this step may be specifically performed as follows: firstly, placing the glass sheet in a beaker, sequentially performing ultrasonic treatment on the glass sheet for 15min by acetone, absolute ethyl alcohol and deionized water respectively, placing the glass sheet in a 60 ℃ drying oven after the ultrasonic treatment is finished, and cooling the glass sheet for later use. Dissolving a certain mass of methoxysilane in water, adding a small amount of acetic acid, stirring uniformly under the action of a magnetic rotor, and standing for later use;
step two: soaking and drying
In one embodiment, this step may be specifically performed as follows: and (4) soaking the glass sheet treated by the oxygen plasma in the mixed solution prepared in the step one for several hours, then placing the glass sheet in an oven for drying, and storing the glass sheet at room temperature for later use.
Step three: preparing solution
In one embodiment, this step may be specifically performed as follows: acrylamide, bisacrylamide, a persulfate, tetramethylethylenediamine and calcium ions with certain mass are dissolved in water, and a certain volume of the solution is taken to be uniformly mixed with polyvinyl alcohol.
Step four: spin coating and drying
In one embodiment, this step may be specifically performed as follows: and (3) spin-coating a certain volume of the mixed solution on a treated glass sheet by using a spin coater, taking out the glass sheet after the spin coating is finished, and drying the glass sheet, thereby obtaining the antifogging glass with excellent wear-resisting property.
Referring to fig. 1, fig. 1 is a transparent picture display and an anti-fog picture of an anti-fog film with wear resistance according to the present invention. As shown in fig. 1 (a), the prepared antifogging glass has good transparency, and the light transmittance is about 90% compared with that of ordinary glass, which shows that the coated film layer does not influence the light transmittance of the glass; in addition, as shown in fig. 1 (b), the prepared mixed solution can be coated on different substrates, such as PVC, PC, PET, etc., all having relatively good transparency; as shown in fig. 1 (c), the prepared film layers on different substrates have a certain antifogging effect, and compared with a blank substrate, the prepared film layer has the advantages that micro water drops cannot be formed on the surface of the prepared film layer under the action of water vapor, characters at the bottom of the beaker can be clearly observed through the glass layer, and therefore the good antifogging effect is achieved.
Referring to fig. 2, (a) in fig. 2 is a graph showing the relationship between the surface of the prepared film layer and the peeling frequency of the adhesive tape of the antifogging film with wear resistance according to the present invention, when a weight of 2kg is loaded, the antifogging effect is still obtained after the adhesive tape is peeled for 160 times; fig. 2 (b) is a graph showing the relationship between the surface of the prepared film layer and the number of times of friction of the sandpaper by using weights with different masses for the antifogging film with wear resistance, and when a 500g weight is loaded, the film layer still has a certain antifogging effect after 160 times of friction of the sandpaper.
Referring to fig. 3, fig. 3 is a surface appearance and a cross-sectional picture of an anti-fog film with wear resistance according to the present invention. As shown in fig. 3 (a), the antifogging surface prepared exhibited a lump of matter aggregation in a small area, and the surface was relatively smooth as a whole. According to the inset picture, the water contact angle of the coating surface is 78.9 ° ± 0.9 °; as shown in (b) of fig. 3, the anti-fog film layer was prepared to have a thickness of 7.9 ± 0.4 μm.
Referring to fig. 4, fig. 4 is an anti-fog picture of an anti-fog film with wear resistance according to the present invention. As shown in FIG. 4, the prepared coated glass can continue to prevent fog after being placed for 366 days, which shows that the antifogging glass prepared by the method has good durability.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying the present invention are further described below. The invention is not limited to the embodiments listed but also comprises any other known variations within the scope of the invention as claimed.
Example one
The embodiment prepares an antifogging film with wear resistance according to the following steps:
step one, preparing a precursor solution with a certain concentration
The glass sheet is placed in a beaker and subjected to ultrasonic treatment for 15min by acetone, absolute ethyl alcohol and deionized water in sequence, and after the ultrasonic treatment is finished, the glass sheet is placed in a 60 ℃ drying oven for drying and is cooled for standby. Dissolving 0.1g of methoxysilane in water, adding 5 mu L of acetic acid, stirring for 4 hours under the action of a magnetic rotor, and standing for later use;
step two: soaking and drying
And (3) treating the cleaned glass sheet by using oxygen plasma for 1.0min, soaking the glass sheet in the mixed solution prepared in the step one for 1 hour, then placing the glass sheet in an oven for drying, and storing the glass sheet at room temperature for later use.
Step three: preparing solution
2.1g of acrylamide, 1.2mg of bisacrylamide, 3.3mg of persulfate and 2g of calcium ions are weighed and dissolved in water, 5 mu L of tetramethylethylenediamine is weighed, a certain volume is uniformly mixed with 1 wt% of polyvinyl alcohol after uniform ultrasonic dispersion, and the volume ratio of the acrylamide mixed solution to the polyvinyl alcohol solution is 1: 1.
Step four: spin coating and drying
Spin-coating the mixed solution prepared in the third step on a glass sheet at the spin-coating speed of 500r/min for 3s, and drying in an oven at 60 ℃ for 1 h.
Example two
The embodiment prepares an antifogging film with wear resistance according to the following steps:
step one, preparing a precursor solution with a certain concentration
The glass sheet is placed in a beaker and subjected to ultrasonic treatment for 15min by acetone, absolute ethyl alcohol and deionized water in sequence, and after the ultrasonic treatment is finished, the glass sheet is placed in a 60 ℃ drying oven for drying and is cooled for standby. Dissolving 0.2g of methoxysilane in water, adding 10 mu L of acetic acid, stirring for 5 hours under the action of a magnetic rotor, and standing for later use;
step two: soaking and drying
And (3) treating the cleaned glass sheet by using oxygen plasma for 2.0min, soaking the glass sheet in the mixed solution prepared in the step one for 2 hours, then placing the glass sheet in an oven to dry, and storing the glass sheet at room temperature for later use.
Step three: preparing solution
3.2g of acrylamide, 2.3mg of bisacrylamide, 6mg of persulfate and 5g of calcium ions are weighed and dissolved in water, 10 mu L of tetramethylethylenediamine is weighed, a certain volume is uniformly mixed with 2.5 wt% of polyvinyl alcohol after uniform ultrasonic dispersion, and the volume ratio of the acrylamide mixed solution to the polyvinyl alcohol solution is 2: 1.
Step four: spin coating and drying
Spin-coating the mixed solution prepared in the third step on a glass sheet at the spin-coating speed of 1000r/min for 10s, and drying in an oven at 90 ℃ for 2 h.
EXAMPLE III
The embodiment prepares an antifogging film with wear resistance according to the following steps:
step one, preparing a precursor solution with a certain concentration
The glass sheet is placed in a beaker and subjected to ultrasonic treatment for 15min by acetone, absolute ethyl alcohol and deionized water in sequence, and after the ultrasonic treatment is finished, the glass sheet is placed in a 60 ℃ drying oven for drying and is cooled for standby. Dissolving 1g of methoxysilane in water, adding 15 mu L of acetic acid, stirring for 6 hours under the action of a magnetic rotor, and standing for later use;
step two: soaking and drying
And (3) treating the cleaned glass sheet by using oxygen plasma for 4.0min, soaking the glass sheet in the mixed solution prepared in the step one for 3 hours, then placing the glass sheet in an oven for drying, and storing the glass sheet at room temperature for later use.
Step three: preparing solution
Weighing 4.1g of acrylamide, 3.5mg of bisacrylamide, 5mg of persulfate and 4g of calcium ions, dissolving in water, weighing 14 mu L of tetramethylethylenediamine, uniformly dispersing by ultrasonic, uniformly mixing a certain volume of tetramethylethylenediamine with 3 wt% of polyvinyl alcohol, wherein the volume ratio of the acrylamide mixed solution to the polyvinyl alcohol solution is 3: 1.
Step four: spin coating and drying
And (4) spin-coating the mixed solution prepared in the third step on a glass sheet at the spin-coating speed of 700r/min for 5s, and drying in an oven at the temperature of 80 ℃ for 3 h.
Example four
The embodiment prepares an antifogging film with wear resistance according to the following steps:
step one, preparing a precursor solution with a certain concentration
The glass sheet is placed in a beaker and subjected to ultrasonic treatment for 15min by acetone, absolute ethyl alcohol and deionized water in sequence, and after the ultrasonic treatment is finished, the glass sheet is placed in a 60 ℃ drying oven for drying and is cooled for standby. Dissolving 3g of methoxysilane in water, adding 20 mu L of acetic acid, stirring for 7 hours under the action of a magnetic rotor, and standing for later use;
step two: soaking and drying
And (3) treating the cleaned glass sheet by using oxygen plasma for 5.0min, soaking the glass sheet in the mixed solution prepared in the step one for 4 hours, then placing the glass sheet in an oven to dry, and storing the glass sheet at room temperature for later use.
Step three: preparing solution
Weighing 4.5g of acrylamide, 6mg of bisacrylamide, 7mg of persulfate and 5g of calcium ions, dissolving in water, weighing 8 mu L of tetramethylethylenediamine, uniformly dispersing by ultrasonic wave, uniformly mixing a certain volume of the mixture with 4 wt% of polyvinyl alcohol, wherein the volume ratio of the acrylamide mixed solution to the polyvinyl alcohol solution is 4: 1.
Step four: spin coating and drying
Spin-coating the mixed solution prepared in the third step on a glass sheet at the spin-coating speed of 800r/min for 10s, and drying in an oven at 95 ℃ for 4 h.
EXAMPLE five
The embodiment prepares an antifogging film with wear resistance according to the following steps:
step one, preparing a precursor solution with a certain concentration
The glass sheet is placed in a beaker and subjected to ultrasonic treatment for 15min by acetone, absolute ethyl alcohol and deionized water in sequence, and after the ultrasonic treatment is finished, the glass sheet is placed in a 60 ℃ drying oven for drying and is cooled for standby. Dissolving 2g of methoxysilane in water, adding 20 mu L of acetic acid, stirring for 7 hours under the action of a magnetic rotor, and standing for later use;
step two: soaking and drying
And (3) treating the cleaned glass sheet by using oxygen plasma for 5.0min, soaking the glass sheet in the mixed solution prepared in the step one for 4 hours, then placing the glass sheet in an oven to dry, and storing the glass sheet at room temperature for later use.
Step three: preparing solution
5.7g of acrylamide, 9.2mg of bisacrylamide, 7mg of persulfate and 5g of calcium ions are weighed and dissolved in water, 8 mu L of tetramethylethylenediamine is weighed, a certain volume is uniformly mixed with 4 wt% of polyvinyl alcohol after uniform ultrasonic dispersion, and the volume ratio of the acrylamide mixed solution to the polyvinyl alcohol solution is 6: 1.
Step four: spin coating and drying
And (4) spin-coating the mixed solution prepared in the third step on a glass sheet at the rotation speed of 1000r/min for 20s, and drying in an oven at 100 ℃ for 5 h.
In conclusion, the invention discloses a preparation method of an antifogging film with wear resistance, which uses a spin coating method to rapidly spread liquid drops on the surface of glass. The anti-fog coating has mild reaction conditions, the light transmittance of the coating reaches 90 percent, the light transmittance of the original glass is not influenced, the coating still has the anti-fog effect after being peeled by using an adhesive tape and rubbed by using abrasive paper for a certain number of times, can be placed for about one year at room temperature, has no pollution to the environment, has good application prospect, and is expected to be well applied to wind shield glass, rearview mirrors, mirrors in bathrooms and the like in automobiles.
It should be noted that the above-mentioned embodiments illustrate rather than limit the technical solution of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will understand that modifications and equivalent substitutions can be made on the technical solution of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (8)
1. The preparation method of the antifogging film is characterized by comprising the following steps of:
(1) preparing precursor solution
Dissolving methoxysilane in water, adding acetic acid, stirring uniformly under the action of a magnetic rotor, and standing for later use;
(2) soaking and drying
Soaking the substrate sheet in the mixed solution prepared in the step (1), drying in an oven, and storing at room temperature for later use;
(3) preparing solution
Dissolving acrylamide, bisacrylamide, a persulfate, tetramethylethylenediamine and calcium ions in water, and uniformly mixing a certain volume of the solution with polyvinyl alcohol;
(4) spin coating and drying
Spin-coating the mixed solution on a treated substrate sheet by a spin coater, taking out the substrate sheet after the spin coating is finished, and drying the substrate sheet, thereby obtaining an antifogging film layer with excellent wear resistance;
the step (3) comprises the following specific steps: firstly, adding calcium ions, acrylamide and water, then adding bisacrylamide and tetramethylethylenediamine, and finally adding a sulfide under the ice bath condition while stirring; after the preparation, uniformly dispersing the mixed solution by ultrasonic, and uniformly mixing the mixed solution with 1-15 wt% of polyvinyl alcohol according to the volume ratio of 1: 1-8: 1;
the specific raw materials in the step (3) are as follows: 1-10 g of acrylamide, 1-10 mg of bisacrylamide, 2-12 mg of persulfate, 1-15 g of calcium ions and 5-30 mu L of tetramethylethylenediamine.
2. The method for producing an antifogging film according to claim 1, characterized in that: the step (1) specifically comprises the steps of weighing 0.1-5 g of methoxysilane to be dissolved in 100mL of water, weighing 5-40 mu L of acetic acid, and magnetically stirring for 3-12 h until the methoxysilane is completely dissolved.
3. The method for producing an antifogging film according to claim 1, characterized in that: the substrate sheet in the step (2) is any one of glass, PC, PET and PVC.
4. The method for producing an antifogging film according to claim 3, characterized in that: and (3) the substrate sheet in the step (2) is a glass sheet treated by oxygen plasma.
5. The method for producing an antifogging film according to claim 1, characterized in that: and (3) soaking the substrate sheet in the mixed solution prepared in the step (1) for 1-8 hours.
6. The method for producing an antifogging film according to claim 1, characterized in that: and (4) the spin-coating speed is 500-2500 r/min, and the spin-coating time is 5-20 s.
7. The method for producing an antifogging film according to claim 1, characterized in that: the drying temperature range in the step (4) is 50-100 ℃.
8. The method for producing an antifogging film according to claim 1, characterized in that: the drying time in the step (4) is 1-20 h.
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