CN110845943A - Water-based transparent antistatic coating and preparation method thereof - Google Patents
Water-based transparent antistatic coating and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a water-based transparent antistatic coating and a preparation method thereof, wherein the coating comprises the following components: 2-5% of waterborne polyurethane resin, 2-6% of waterborne polyester resin, 0.1-0.6% of waterborne curing agent, 0.1-0.6% of dispersant, 0.1-0.6% of auxiliary dispersant, 0.05-0.3% of single-walled carbon nanotube, 0.1-0.3% of wetting agent, 0.1-0.4% of flatting agent, 0.1-0.4% of base material wetting agent and the balance of deionized water. The advantage of low conductive threshold of the single-walled carbon nanotube is utilized, and uniform, long-acting and stable single-walled carbon nanotube water is obtained under the synergistic effect of the small molecular weight dispersant and the macromolecular long-chain auxiliary dispersantThe performance of the coating is regulated and controlled by the soft and hard compounding of the waterborne polyurethane and the waterborne saturated polyester, a waterborne transparent antistatic coating with excellent comprehensive performance is obtained on the surface of the plastic-based material, and the square resistor is 105‑7Omega/□, the light transmittance of the coating can reach 99 percent.
Description
Technical Field
The invention belongs to the technical field of new materials, relates to a nano carbon material, and particularly relates to a water-based transparent antistatic coating and a preparation method thereof.
Background
Static electricity is a phenomenon of charge accumulation due to contact or friction, etc., and causes great damage to the electronic industry, the petroleum industry, the weapon industry, the textile industry, the rubber industry, and the aviation and military fields, and only the electronic industry is taken as an example to count, and damage related to static electricity causes billions of dollars of loss to the world electronic manufacturing industry every year, so that the static electricity prevention technology is a long-term and indispensable important technology. At present, in the fields of electronic protection films, electronic packages and electronic trays, most of transparent antistatic materials adopt conductive polymers, surfactants, ionic liquids and the like as antistatic agents, wherein the surfactants and the ionic liquids mainly form a water film based on the adsorption of water vapor in the surface and air to achieve the conductive function, and are greatly influenced by the weather environment, and the currently mainstream transparent antistatic agents are mainly conductive polymers, especially polythiophene. However, the development of transparent permanent antistatic materials is widely expected in the electronic field because conductive polymer antistatic products mainly have defects of poor durability and weather resistance and have serious conductivity attenuation in long-term use.
The single-walled carbon nanotube is a one-dimensional tubular nano material formed by curling single-layered graphite, has the advantages of good conductivity, large length-diameter ratio, stable structure and the like, can realize a transparent conductive function by adding an ultralow conductive threshold value into a resin matrix, and is one of the most excellent conductive filling materials at present. However, due to the structural characteristics of thin tube diameter, large specific surface area and the like, the single-walled carbon nanotubes are very strong in physical winding and van der waals acting force, so that the single-walled carbon nanotubes are difficult to disperse, the highly crystallized sp2 carbon-carbon bond surface has strong physicochemical inertia, so that the single-walled carbon nanotubes are difficult to disperse and have poor dispersion stability, and particularly, a dispersion aid is easy to remove from the surface of the carbon nanotubes in a system with a good solvent, so that the single-walled carbon nanotubes are precipitated. Therefore, the application of the single-walled carbon nanotube in the field of functional coatings is severely restricted by the difficult problems of high-efficiency dispersion and dispersion stability.
The invention patent 201811030780.9 discloses a transparent water-based AZO antistatic coating and a preparation method thereof, wherein AZO nano conductive powder is used as a conductive auxiliary agent, and the transparent antistatic coating is obtained by mixing and dispersing CTAB (cetyl trimethyl ammonium bromide) and T-80 (Tween 80) and water-based polyester resin. The Chinese invention patent 201510859713.8 discloses a carbon nanotube antistatic film with strong adhesion, high transmittance and low sheet resistance and a preparation process thereof, wherein sodium dodecyl benzene sulfonate is used as a dispersant, a carbon nanotube aqueous dispersion is prepared by ultrasonic dispersion, and then tackifier triton and binder waterborne polyurethane are added to prepare a carbon nanotube aqueous coating. The existing reports relate to the formula, preparation and application of the single-walled carbon nanotube transparent antistatic coating, and the inherent problems are not fundamentally solved.
Disclosure of Invention
The invention discloses a water-based transparent antistatic coating and a preparation method thereof, which aim to solve any one of the above and other potential problems in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows: the water-based transparent antistatic coating comprises the following components in percentage by weight: aqueous polyurethane resin: 2-5%, water-based polyester resin: 2-6 percent of water-based curing agent, 0.1-0.6 percent of dispersant, 0.1-0.6 percent of auxiliary dispersant, 0.1-0.6 percent of single-walled carbon nanotube, 0.05-0.3 percent of wetting agent: 0.1-0.3%, leveling agent: 0.1-0.4%, base wetting agent: 0.1-0.4 percent, and the balance of deionized water.
Further, the aqueous polyurethane resin is polyester, polycarbonate type aqueous polyurethane resin or water dispersible resin; the water-based polyester resin is water-based saturated polyester resin.
The aqueous curing agent is any one or any combination of two or more of aqueous isocyanate, blocked aqueous isocyanate, melamine formaldehyde resin and alkyl melamine formaldehyde resin.
Further, the dispersing agent is a surfactant, and the surfactant is any one or any combination of more than two of alkyl sulfonate, alkylbenzene sulfonate and alkyl polyoxyethylene ether; the auxiliary dispersing agent is a water-soluble long-chain macromolecular material, and the water-soluble long-chain macromolecular material is any one or any combination of more than two of polyvinylpyrrolidone, polyvinyl alcohol, carboxymethyl cellulose and water-soluble polyacrylic resin.
Furthermore, the single-walled carbon nanotube is prepared by adopting a chemical vapor deposition method, a high-pressure carbon monoxide method, an electric arc method or a plasma method, and the tube diameter is 1-2 nm.
Further, the wetting agent is an aqueous wetting agent, and the aqueous wetting agent is BYK151, BYK154, BYK180, BYK184, BYK187, BYK190, BYK191, BYK192, BYK194, BYK2010 or BYK 2015; the leveling agent is a polysiloxane wetting agent, and the polysiloxane wetting agent is BYK331, BYK333, BYK341 or BYK 378; the substrate wetting agent is a water-based organic silicon substrate wetting agent, and the water-based organic silicon substrate wetting agent is BYK345, BYK346 or BYK 348.
The invention also aims to provide a preparation method of the water-based transparent antistatic coating, which specifically comprises the following steps:
s1), firstly, treating the single-walled carbon nanotube by direct-current discharge plasma to improve the hydrophilic characteristic of the single-walled carbon nanotube and obtain a modified single-walled carbon nanotube;
s2) mixing the modified single-walled carbon nanotube, the dispersant, the auxiliary dispersant, the wetting agent and water, shearing at a high speed, pre-dispersing, standing and infiltrating for 2-24 hours to obtain a mixture;
s3) sequentially carrying out sand grinding and high-pressure homogenizing grinding dispersion on the mixture until the fineness is below 10 mu m to obtain a single-walled carbon nanotube dispersion liquid;
s4) sequentially adding the waterborne polyurethane resin, the waterborne polyester resin, the waterborne curing agent, the flatting agent and the base material wetting agent into the single-walled carbon nanotube dispersion liquid prepared in S3), complementing the balance of deionized water, and filtering and subpackaging by using a 200-plus 400-mesh filter screen to obtain the waterborne transparent antistatic coating.
Further, the dc discharge plasma processing in S1) is: a rotary tube type direct current discharge plasma furnace is adopted, the power is 10-30kW, and the processing time is 10-30 minutes; the S2): the shearing linear speed is 2-40 m/s, and the processing time is 30 minutes-6 hours; the grinding medium in the S3) adopts ceramic beads, the diameter is 0.2-2.0 mm, and the linear velocity of a dispersion disc is 2-40 m/S; the high-pressure homogenizing treatment pressure is 40-100 MPa.
Further, the square resistance of the water-based transparent antistatic coating 105-7Omega/□, the light transmittance of the coating can reach 99 percent.
A transparent antistatic film is prepared by adopting the water-based transparent antistatic coating, and the specific process comprises the following steps of; coating the water-based transparent antistatic coating on a substrate made of polyethylene terephthalate, polystyrene, polycarbonate or ABS (acrylonitrile-butadiene-styrene) material in a blade coating, roll coating or dimple coating mode, and baking for 2-30 minutes at 90-150 ℃ to obtain the transparent antistatic film with permanent antistatic property.
Compared with the prior art, the invention has the advantages that:
(1) the single-walled carbon nanotube has an ultra-low conductive threshold and a stable structure, and the prepared antistatic film can realize transparent and permanent antistatic functions and has no attenuation;
(2) the plasma treatment process is adopted to etch and remove the impurities from the amorphous carbon on the surface of the single-walled carbon nanotube, partially oxidize the surface carbon and introduce oxygen-containing groups, so that more excellent hydrophilic performance is obtained, the dispersibility of the single-walled carbon nanotube in water is greatly improved, the subsequent dispersion is facilitated, and the dispersion liquid is more stable;
(3) in a dispersion system, the dispersant is compounded and cooperated with a small molecular weight dispersant and a large molecular weight auxiliary dispersant, the single-walled carbon nanotube is more easily dispersed in water to form high-concentration dispersion liquid by utilizing the excellent dispersing capacity of the small molecular weight dispersant on the single-walled carbon nanotube, and meanwhile, the long-chain macromolecular auxiliary dispersant is assisted to perform molecular winding action on the single-walled carbon nanotube, so that the more excellent stability of the dispersion liquid and the compatibility stability with various water-based resins are obtained, the formula design of the water-based paint is greatly facilitated, and the universality is higher;
(4) the full water-based system is green and environment-friendly.
Drawings
FIG. 1 is a block diagram of a process for preparing a water-based transparent antistatic coating.
Fig. 2 shows a transparent antistatic film obtained in example 1 prepared by the method of the present invention.
Detailed Description
The technical solution of the present invention is further described with reference to the following specific embodiments.
The invention relates to a water-based transparent antistatic coating, which comprises the following components in percentage by weight: aqueous polyurethane resin: 2-5%, water-based polyester resin: 2-6 percent of water-based curing agent, 0.1-0.6 percent of dispersant, 0.1-0.6 percent of auxiliary dispersant, 0.1-0.6 percent of single-walled carbon nanotube, 0.05-0.3 percent of wetting agent: 0.1-0.3%, leveling agent: 0.1-0.4%, base wetting agent: 0.1-0.4 percent, and the balance of deionized water.
The aqueous polyurethane resin is polyester, polycarbonate type aqueous polyurethane resin or water dispersible resin; the water-based polyester resin is water-based saturated polyester resin.
The waterborne curing agent is any one or any combination of more than two of waterborne isocyanate, closed waterborne isocyanate, melamine formaldehyde resin and alkyl melamine formaldehyde resin.
The dispersing agent is a surfactant, and the surfactant is any one or any combination of more than two of alkyl sulfonate, alkylbenzene sulfonate and alkyl polyoxyethylene ether; the auxiliary dispersing agent is a water-soluble long-chain macromolecular material, and the water-soluble long-chain macromolecular material is any one or any combination of more than two of polyvinylpyrrolidone, polyvinyl alcohol, carboxymethyl cellulose and water-soluble polyacrylic resin.
The single-walled carbon nanotube can be prepared by chemical vapor deposition, high-pressure carbon monoxide, arc, plasma and the like, and has the tube diameter of 1-2 nm.
The wetting agent is an aqueous wetting agent, and the aqueous wetting agent is BYK151, BYK154, BYK180, BYK184, BYK187, BYK190, BYK191, BYK192, BYK194, BYK2010 or BYK 2015; the leveling agent is a polysiloxane wetting agent, and the polysiloxane wetting agent is BYK331, BYK333, BYK341 or BYK 378; the substrate wetting agent is a water-based organic silicon substrate wetting agent, and the water-based organic silicon substrate wetting agent is BYK345, BYK346 or BYK 348.
The invention also aims to provide a preparation method of the water-based transparent antistatic coating, which specifically comprises the following steps:
s1), firstly, treating the single-walled carbon nanotube by direct-current discharge plasma to improve the hydrophilic characteristic of the single-walled carbon nanotube and obtain a modified single-walled carbon nanotube;
s2) mixing the modified single-walled carbon nanotube, the dispersant, the auxiliary dispersant, the wetting agent and water, shearing at a high speed, pre-dispersing, standing and infiltrating for 2-24 hours to obtain a mixture;
s3) sequentially carrying out sand grinding and high-pressure homogenizing grinding dispersion on the mixture until the fineness is below 10 mu m to obtain a single-walled carbon nanotube dispersion liquid;
s4) sequentially adding the waterborne polyurethane resin, the waterborne polyester resin, the waterborne curing agent, the leveling agent and the base material wetting agent into the S3) to prepare the single-walled carbon nanotube dispersion liquid, testing the viscosity and the solid content index, complementing the balance of deionized water, filtering and subpackaging by using a 200-plus 400-mesh filter screen to obtain the waterborne transparent antistatic coating, wherein the step is shown in figure 1.
Further, the dc discharge plasma processing in S1) is: a rotary tube type direct current discharge plasma furnace is adopted, the power is 10-30kW, and the processing time is 10-30 minutes; the S2): the shearing linear speed is 2-40 m/s, and the processing time is 30 minutes-6 hours; the grinding medium in the S3) adopts ceramic beads, the diameter is 0.2-2.0 mm, and the linear velocity of a dispersion disc is 2-40 m/S; the high-pressure homogenizing treatment pressure is 40-100 MPa.
Further, the square resistance of the water-based transparent antistatic coating 105-7Omega/□, the light transmittance of the coating can reach 99 percent.
A transparent antistatic film is prepared by adopting the water-based transparent antistatic coating, and the specific process comprises the following steps of; coating the water-based transparent antistatic coating on a substrate made of polyethylene terephthalate, polystyrene, polycarbonate or ABS (acrylonitrile-butadiene-styrene) material in a blade coating, roll coating or dimple coating mode, and baking for 2-30 minutes at 90-150 ℃ to obtain the transparent antistatic film with permanent antistatic property.
Example 1
The water-based transparent antistatic coating comprises the following basic components in percentage by weight:
polycarbonate type aqueous polyurethane resin: 5%, aqueous polyester resin: 6%, blocked aqueous isocyanate: 0.6%, sodium dodecylbenzenesulfonate: 0.6 percent; polyvinylpyrrolidone: 0.6 percent, single-walled carbon nano-tube (tube diameter of 1-2nm): 0.3%, BYK 191: 0.3%, BYK 333: 0.4%, BYK 345: 0.4 percent and the balance of deionized water
The preparation method comprises the following steps: loading the single-walled carbon nanotube (chemical vapor deposition method) into a rotary tube type plasma furnace, and treating by direct-current discharge plasma to improve the hydrophilic characteristic of the single-walled carbon nanotube to obtain a modified single-walled carbon nanotube; mixing the modified single-walled carbon nanotube, sodium dodecyl benzene sulfonate, polyvinylpyrrolidone, BYK191 and water, performing high-speed shearing pre-dispersion by using a high-speed dispersion machine, performing shearing linear velocity of 10 m/s for 30 minutes, standing and infiltrating for 6 hours to obtain a mixture; grinding and dispersing the mixture by a pin type sand mill in sequence, wherein the grinding medium adopts ceramic beads, the diameter of the ceramic beads is 1.0 mm, and the linear velocity of a dispersion disc is 20 m/s; the single-walled carbon nanotube dispersion liquid is obtained by adopting high-pressure homogenization treatment under the pressure of 100MPa and the fineness of less than 10 mu m. During the stirring process, the polycarbonate polyurethane resin, the water-based polyester resin, the water-based curing agent, the leveling agent and the base material wetting agent are sequentially added into the single-walled carbon nanotube dispersion liquid, the indexes such as viscosity, solid content and the like are tested, the balance of deionized water is complemented, and a 400-mesh filter screen is used for filtering and subpackaging, so that the finished coating is obtained. A sample is prepared on the surface of PET by using a 3# RDS wire rod, and the sample is baked for 10 minutes at 140 ℃ to obtain a transparent antistatic film, as shown in figure 2.
Example 2
The water-based transparent antistatic coating comprises the following basic components in percentage by weight:
polycarbonate type aqueous polyurethane resin: 3%, aqueous polyester resin: 2 percent of melamine formaldehyde resin, 0.1 percent of alkyl polyoxyethylene ether (OP-10), 0.1 percent of polyvinyl alcohol 2000, 0.1 percent of single-walled carbon nanotube (the pipe diameter is 1-2nm), 0.05 percent of BYK180, 0.1 percent of BYK378 and BYK 346; 0.1 percent and the balance of deionized water
The preparation method comprises the following steps: loading the single-walled carbon nanotube (chemical vapor deposition method) into a rotary tube type plasma furnace, and treating by direct-current discharge plasma to improve the hydrophilic characteristic of the single-walled carbon nanotube to obtain a modified single-walled carbon nanotube; mixing the modified single-walled carbon nanotube, alkyl polyoxyethylene ether (OP-10), polyvinyl alcohol 2000, BYK180 and water, performing high-speed shearing pre-dispersion by adopting a colloid mill, performing static infiltration for 24 hours at a shearing linear speed of 5 m/s for 2 hours to obtain a mixture; grinding and dispersing the mixture by a turbine type sand mill in sequence, wherein a grinding medium adopts ceramic beads, the diameter of the ceramic beads is 1.0 mm, and the linear velocity of a dispersion disc is 25 m/s; the single-walled carbon nanotube dispersion liquid is obtained by adopting high-pressure homogenization treatment under the pressure of 40MPa and the fineness of less than 10 mu m. During the stirring process, the polyether polyurethane water-based resin, the water-based polyester resin, the water-based curing agent, the leveling agent and the base material wetting agent are sequentially added into the single-walled carbon nanotube dispersion liquid, the indexes such as viscosity, solid content and the like are tested, the balance of deionized water is complemented, and a 300-mesh filter screen is used for filtering and subpackaging to obtain the finished coating. And (3) preparing a sample on the surface of the PET by using a 3# RDS wire rod, and baking for 10 minutes at 140 ℃ to obtain the transparent antistatic film.
Example 3
The water-based transparent antistatic coating comprises the following basic components in percentage by weight:
5 percent of polyester type waterborne polyurethane resin, 4 percent of waterborne polyester resin, 0.5 percent of waterborne isocyanate, 0.5 percent of sodium dodecyl sulfate, 0.5 percent of water-soluble polyacrylic acid, 0.2 percent of single-walled carbon nanotube (the pipe diameter is 1-2nm), 0.1 percent of BYK184, 0.2 percent of BYK331, 0.2 percent of BYK346,
the balance of deionized water;
the preparation method comprises the following steps: loading the single-walled carbon nanotube (high-pressure carbon monoxide method) into a rotary tube type plasma furnace, and treating by direct-current discharge plasma to improve the hydrophilic characteristic of the single-walled carbon nanotube to obtain a modified single-walled carbon nanotube; mixing the modified single-walled carbon nanotube, sodium dodecyl sulfate, water-soluble polyacrylic acid, BYK184 and water, performing high-speed shearing pre-dispersion by adopting a high-speed emulsifying machine, performing shearing linear velocity of 5 m/s for 2 hours, standing and infiltrating for 12 hours to obtain a mixture; grinding and dispersing the mixture by a disc type sand mill in sequence, wherein a grinding medium adopts ceramic beads, the diameter of the ceramic beads is 1.0 mm, and the linear velocity of a dispersion disc is 20 m/s; the single-walled carbon nanotube dispersion liquid is obtained by high-pressure homogenization under the pressure of 80MPa and the fineness of less than 10 mu m. During the stirring process, polycarbonate type polyurethane water-based resin, water-based polyester resin, a water-based curing agent, a flatting agent and a base material wetting agent are sequentially added into the single-walled carbon nanotube dispersion liquid, indexes such as viscosity, solid content and the like are tested, the balance of deionized water is complemented, and a 200-mesh filter screen is used for filtering and subpackaging to obtain the finished coating. And (3) preparing a sample on the surface of the PET by using a 3# RDS wire rod, and baking for 10 minutes at 120 ℃ to obtain the transparent antistatic film.
Comparative example 1
Comparative example 1 was substantially identical to example 1 except that sodium dodecylbenzenesulfonate was used in place of all of the polyvinylpyrrolidone and had a basic composition and weight percentages of:
polycarbonate type aqueous polyurethane resin: 5%, aqueous polyester resin: 6%, blocked aqueous isocyanate: 0.6%, sodium dodecylbenzenesulfonate: 1.2%, single-walled carbon nanotubes (tube diameter 1-2nm): 0.3%, BYK 191: 0.3%, BYK 333; 0.4%, BYK 345: 0.4 percent, and the balance being deionized water;
comparative example 2
The comparative example 2 and the example 2 have basically the same components, except that PEDOT-PSS aqueous dispersion is used as a conductive agent, and the conductive agent comprises the following basic components in percentage by weight:
polycarbonate type aqueous polyurethane resin: 2%, aqueous polyester resin: 3%, melamine formaldehyde resin: 0.1%, polyoxyethylene alkyl ether (OP-10): 0.1%, polyvinyl alcohol 2000: 0.1%, PEDOT-PSS: 0.05%, BYK180: 0.1%, BYK378: 0.1%, BYK346: 0.1 percent and the balance of deionized water;
test method
1. Aging resistance test
The transparent antistatic film was placed in an ultraviolet weathering test chamber at 25 ℃ for an aging simulation test for 200 hours, and then its properties were measured.
2. Stability test
And placing the finished coating in a high-speed refrigerated centrifuge, setting the temperature at 25 ℃, centrifuging for 10 minutes at the speed of 2000r/min, and visually inspecting whether sediment exists at the bottom.
Table 1 coating performance data:
in conclusion, the transparent antistatic coating has good storage stability, and the square resistor 10 of the prepared transparent antistatic film is5-7Omega/□, the light transmittance of the coating can reach 99 percent, and the coating is permanently antistatic and has no attenuation and great commercial value.
In view of the deficiencies in the prior art, the inventors of the present invention have made extensive studies and extensive practices to provide technical solutions of the present invention.
While several embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes may be made to the embodiments herein without departing from the spirit of the invention. The above examples are merely illustrative and should not be taken as limiting the scope of the invention.
Claims (10)
1. The water-based transparent antistatic coating is characterized by comprising the following components in percentage by weight: aqueous polyurethane resin: 2-5%, water-based polyester resin: 2-6 percent of water-based curing agent, 0.1-0.6 percent of dispersant, 0.1-0.6 percent of auxiliary dispersant, 0.1-0.6 percent of single-walled carbon nanotube: 0.05-0.3%, wetting agent: 0.1-0.3%, leveling agent: 0.1-0.4%, base wetting agent: 0.1-0.4 percent, and the balance of deionized water.
2. The aqueous transparent antistatic coating of claim 1, wherein the aqueous polyurethane resin is a polyester, polycarbonate type aqueous polyurethane resin or water-dispersible resin; the water-based polyester resin is water-based saturated polyester resin.
3. The water-based transparent antistatic coating of claim 1, wherein the water-based curing agent is any one of or any combination of two or more of water-based isocyanate, blocked water-based isocyanate, melamine formaldehyde resin and hydrocarbon-based melamine formaldehyde resin.
4. The water-based transparent antistatic coating of claim 1, wherein the dispersant is a surfactant, and the surfactant is any one or any combination of two or more of alkyl sulfonate, alkylbenzene sulfonate and alkyl polyoxyethylene ether; the auxiliary dispersing agent is a water-soluble long-chain macromolecular material, and the water-soluble long-chain macromolecular material is any one or any combination of more than two of polyvinylpyrrolidone, polyvinyl alcohol, carboxymethyl cellulose and water-soluble polyacrylic resin.
5. The water-based transparent antistatic coating of claim 1, wherein the single-walled carbon nanotubes are prepared by a chemical vapor deposition method, a high-pressure carbon monoxide method, an electric arc method or a plasma method, and have the tube diameter of 1-2 nm.
6. The water-based transparent antistatic coating of claim 1, wherein the wetting agent is a water-based wetting agent, and the water-based wetting agent is BYK151, BYK154, BYK180, BYK184, BYK187, BYK190, BYK191, BYK192, BYK194, BYK2010 or BYK 2015; the leveling agent is a polysiloxane wetting agent, and the polysiloxane wetting agent is BYK331, BYK333, BYK341 or BYK 378; the substrate wetting agent is a water-based organic silicon substrate wetting agent, and the water-based organic silicon substrate wetting agent is BYK345, BYK346 or BYK 348.
7. A method for preparing the water-based transparent antistatic coating according to any one of claims 1 to 6, which comprises the following steps:
s1), firstly, treating the single-walled carbon nanotube by direct-current discharge plasma to improve the hydrophilic characteristic of the single-walled carbon nanotube and obtain a modified single-walled carbon nanotube;
s2) mixing the modified single-walled carbon nanotube, the dispersant, the auxiliary dispersant, the wetting agent and water, shearing at a high speed, pre-dispersing, standing and infiltrating for 2-24 hours to obtain a mixture;
s3) sequentially carrying out sand grinding and high-pressure homogenizing grinding dispersion on the mixture until the fineness is below 10 mu m to obtain a single-walled carbon nanotube dispersion liquid;
s4) sequentially adding the waterborne polyurethane resin, the waterborne polyester resin, the waterborne curing agent, the flatting agent and the base material wetting agent into the single-walled carbon nanotube dispersion liquid prepared in S3), complementing the balance of deionized water, and filtering and subpackaging by using a 200-plus 400-mesh filter screen to obtain the waterborne transparent antistatic coating.
8. The method according to claim 7, wherein the dc discharge plasma treatment in S1) is: a rotary tube type direct current discharge plasma furnace is adopted, the power is 10-30kW, and the processing time is 10-30 minutes; the S2): the shearing linear speed is 2-40 m/s, and the processing time is 30 minutes-6 hours; the grinding medium in the S3) adopts ceramic beads, the diameter is 0.2-2.0 mm, and the linear velocity of a dispersion disc is 2-40 m/S; the high-pressure homogenizing treatment pressure is 40-100 MPa.
9. The method according to claim 7, wherein the water-based transparent antistatic coating has a sheet resistance of 105-7Omega/□, the light transmittance of the coating can reach 99 percent.
10. A transparent antistatic film, wherein the transparent antistatic film is prepared by using the aqueous transparent antistatic coating according to any one of claims 1 to 9.
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