CN115109294B - Antistatic film and preparation method thereof - Google Patents

Antistatic film and preparation method thereof Download PDF

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Publication number
CN115109294B
CN115109294B CN202210844429.3A CN202210844429A CN115109294B CN 115109294 B CN115109294 B CN 115109294B CN 202210844429 A CN202210844429 A CN 202210844429A CN 115109294 B CN115109294 B CN 115109294B
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antistatic film
antistatic
carbon
carbon nanotubes
film
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CN115109294A (en
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陈艳芳
尹峰
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Suzhou Naplus Nano Materials Co ltd
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Suzhou Naplus Nano Materials Co ltd
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    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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Abstract

The invention discloses an antistatic film and a preparation method thereof, wherein the preparation method of the antistatic film comprises the following steps: obtaining an aqueous dispersion of carbon nanotubes; uniformly mixing the carbon nanotube dispersion liquid, the water-based binding resin, the olefin emulsion, water and the auxiliary agent to obtain carbon nanotube antistatic coating liquid; coating the antistatic coating liquid of the carbon nano tube on the surface of a substrate, and curing to obtain an antistatic film original film; and rinsing the antistatic film raw film in an organic extraction solvent to obtain the transparent antistatic film. The antistatic film prepared by the method provided by the invention has the advantages that excellent conductivity is ensured, meanwhile, more excellent light transmittance is obtained, and the combination of high light transmittance and high conductivity is realized, so that the antistatic film is a transparent antistatic film with excellent comprehensive performance.

Description

Antistatic film and preparation method thereof
Technical Field
The present invention relates to antistatic films, and more particularly, to an antistatic film and a method for preparing the same.
Background
The transparent antistatic film is a functional film which is a great number of practical functions in electronic packaging and protecting materials, and the surface conductive property of the transparent antistatic film is utilized to avoid high voltage formed by charge aggregation, thereby bringing damage to electronic devices. In the past, conductive polymer materials (such as PEDOT and the like) and carbon materials (such as carbon black, carbon nanotubes, graphene and the like) are coated on the surface of a transparent substrate, so that the plastic substrate obtains certain surface conductivity. However, high conductivity and high transmittance are a set of contradictory problems for thin film materials, and high conductivity requires the addition of a large amount of conductive material, which tends to bring about a sharp decrease in transmittance.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an antistatic film and a preparation method thereof, which can enable the antistatic film to have excellent conductivity and high light transmittance.
To achieve the above object, an embodiment of the present invention provides a method for producing an antistatic film, including the steps of:
obtaining an aqueous dispersion of carbon nanotubes;
uniformly mixing the carbon nanotube dispersion liquid, the water-based binding resin, the olefin emulsion, water and the auxiliary agent to obtain carbon nanotube antistatic coating liquid;
coating the antistatic coating liquid of the carbon nano tube on the surface of a substrate, and curing to obtain an antistatic film original film; and
and rinsing the antistatic film raw film in an organic extraction solvent to obtain the transparent antistatic film.
In one or more embodiments of the present invention, the carbon nanotube aqueous dispersion comprises the following raw material components in percentage by mass:
in one or more embodiments of the present invention, the carbon nanotubes are single-walled carbon nanotubes or few-walled carbon nanotubes, and the number of tube walls of the few-walled carbon nanotubes is less than 5; and/or, the diameter of the carbon nano tube is 0.4-4nm.
In one or more embodiments of the present invention, the dispersant is one or more of a cationic surfactant, an anionic surfactant, and a nonionic surfactant.
In one or more embodiments of the present invention, the dispersant is composed of an anionic surfactant and a nonionic surfactant, and the mass ratio of the anionic surfactant to the nonionic surfactant is (1 to 10): 1.
in one or more embodiments of the present invention, the step of obtaining an aqueous dispersion of carbon nanotubes comprises: uniformly dispersing the carbon nano tube, the dispersing agent and the dispersing liquid wetting agent in water by adopting nano grinding and high-pressure homogenizing dispersing means, and filtering by using a 300-600 mesh filter screen to obtain the carbon nano tube aqueous dispersing liquid.
In one or more embodiments of the invention, the adjuvants include leveling agents and substrate wetting agents.
In one or more embodiments of the present invention, the carbon nanotube antistatic coating liquid comprises the following raw material components by weight percent:
in one or more embodiments of the present invention, the melting point of the olefin in the olefin emulsion is less than 70 ℃, and the olefin emulsion is a paraffin emulsion or a white oil emulsion.
The invention also discloses an antistatic film which comprises a base material and a carbon nano tube coating formed on the base material, wherein the base material is made of a flexible transparent material, and the thickness of the carbon nano tube coating is 100nm-10 mu m.
In one or more embodiments of the present invention, the melting point of the olefin in the olefin emulsion is less than 70 ℃, and the olefin emulsion is a paraffin emulsion or a white oil emulsion.
The invention also discloses an antistatic film, which comprises a substrate layer and a carbon nano tube coating, wherein the substrate layer is made of a flexible transparent material, and the carbon nano tube coating comprises single-wall carbon nano tubes or few-wall carbon nano tubes, wherein the number of tube wall layers of the single-wall carbon nano tubes or the few-wall carbon nano tubes is less than 5, and the diameter of the single-wall carbon nano tubes or the few-wall carbon nano tubes is 0.4-4nm.
Compared with the prior art, the antistatic film and the preparation method thereof according to the embodiment of the invention have the beneficial effects that:
(1) Forming a discrete oil phase pool by utilizing the phase separation effect of the olefin emulsion and the carbon nano tube in the drying and curing process, pushing the carbon nano tube to form a grid patterning structure, and further obtaining a patterned carbon nano tube conductive network after extracting by an organic extraction solvent;
(2) The patterned carbon nanotube conductive network has the characteristics of stable conductive network and low surface coverage rate, the conductive network can improve the conductivity of the antistatic film, and the low surface coverage rate can improve the light transmittance of the antistatic film, so that the antistatic film has the performance of both high conductivity and high light transmittance;
(3) The carbon nanotube conductive network formed by the olefin emulsion and the carbon nanotubes under the pushing of phase separation is of a longer carbon nanotube bundle structure, can be communicated with the upper surface and the lower surface during the subsequent cutting of the film, has the characteristic of volume conductivity, effectively releases the accumulated charges on the upper surface and the lower surface, and has important application in the antistatic field.
Drawings
FIG. 1 is a schematic diagram of a conductive network of carbon nanotubes before extraction according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a conductive network of carbon nanotubes after extraction according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
The method for preparing an antistatic film according to a preferred embodiment of the present invention includes the steps of:
s1, obtaining the carbon nano tube aqueous dispersion liquid.
In S1, the carbon nano tube aqueous dispersion liquid comprises the following raw material components in percentage by mass: 0.05 to 4 percent of carbon nano tube, 0.05 to 10 percent of dispersing agent, 0.01 to 1 percent of dispersion wetting agent and the balance of water.
In the above raw material composition, the carbon nanotubes may be single-walled carbon nanotubes or few-walled carbon nanotubes, and preferably, the carbon nanotubes are single-walled carbon nanotubes. The dispersant may be any one of a cationic surfactant, an anionic surfactant and a nonionic surfactant. The preferential dispersing agent can be an anionic surfactant and a nonionic surfactant, and the mass ratio of the anionic surfactant to the nonionic surfactant is (1-10): 1.
the dispersion wetting agent can be polysiloxane aqueous wetting agent, and can be any one of BYK180, BYK184, BYK187, BYK190, BYK191, BYK192, BYK194, BYK151 and BYK 154.
In S1, the step of obtaining the aqueous dispersion of carbon nanotubes may include: uniformly dispersing the carbon nano tube, the dispersing agent and the dispersing liquid wetting agent in water by adopting nano grinding and high-pressure homogenizing dispersing means, and filtering by using a 300-600 mesh filter screen to obtain the carbon nano tube aqueous dispersing liquid.
In the above steps, the nano grinding and dispersing process may be: the linear speed of the grinding dispersion disc is 1-10 m/s, the grinding medium is ceramic beads, preferably zirconia beads, the diameter is 0.4-2.0 mm, and the grinding times are 3-10 times. The high-pressure homogenizing and dispersing process can be as follows: working pressure is 50-200MPa, and homogenizing times are 5-20 times.
In other embodiments, the aqueous carbon nanotube dispersion may also be purchased directly from similar products in the existing market.
S2, uniformly mixing the carbon nano tube dispersion liquid, the water-based binding resin, the olefin emulsion, the water and the auxiliary agent to obtain the carbon nano tube antistatic coating liquid.
In S2, the auxiliary agent may be a leveling agent and a substrate wetting agent. The carbon nano tube antistatic coating liquid comprises the following raw material components in percentage by weight: 50-90% of carbon nano tube aqueous dispersion, 5-40% of aqueous binding resin, 1-20% of olefin emulsion, 0.1-1% of flatting agent, 0.1-1% of base material wetting agent and the balance of water.
In S2, the melting point of the olefin in the olefin emulsion is less than 70 ℃, and the olefin emulsion may be a paraffin emulsion or a white oil emulsion. The aqueous binder resin may be any one or a combination of aqueous polyurethane, aqueous acrylic acid, aqueous saturated polyester, aqueous alkyd, and the like. The leveling agent can be organosilicon or organofluorine water paint leveling agent, and can be BYK3410, BYK3455, BYK331, BYK333, BYK378 and the like. The substrate wetting agent can be a water-based paint substrate wetting agent, and can be specifically BYK3400, BYK3450, BYK3451, BYK3481, BYK3499, tego245, tego 450 and the like.
S3, coating the antistatic coating liquid of the carbon nano tube on the surface of the substrate, and curing to obtain an antistatic film original film.
In S3, the coating process may be any one of spray coating, roll coating, knife coating. The curing may be a heat curing treatment, and the specific conditions of the heat curing treatment may be baking at 80-150 ℃ for 1-10min.
And S4, rinsing the antistatic film original film in an organic extraction solvent to obtain the transparent antistatic film.
The organic extraction solvent can be one of chloroform, toluene, carbon disulfide, xylene and ethanol. The rinsing time may be 5 to 100 seconds.
According to the preparation method, the discrete oil phase pool is formed by utilizing the phase separation effect of the olefin emulsion and the carbon nano tube in the drying and curing process, the carbon nano tube is pushed to form a grid patterning structure, and then the patterned carbon nano tube conductive network is obtained after the extraction of an organic extraction solvent. In one embodiment, as shown in fig. 1, the threads in fig. 1 may be understood as carbon nanotubes, and the oval or round shaped material may be understood as olefin emulsion that may form olefin emulsion particles on the surface of the substrate after drying. The threads in fig. 2 can be understood as carbon nanotubes as shown in fig. 2 before extraction. The patterned material obtained from the carbon nanotubes after the extraction treatment of the substrate surface may be considered as a patterned carbon nanotube conductive network.
The patterned carbon nanotube conductive network has the characteristics of stable conductive network and low surface coverage rate, and has the advantages of high conductivity and high light transmittance;
the carbon nano tube conductive network formed under the pushing of phase separation is of a longer carbon nano tube bundle structure, can be communicated with the upper surface and the lower surface when the film is cut later, has the characteristic of volume conductivity, effectively releases the accumulated charges on the upper surface and the lower surface, and has important application in the antistatic field.
The invention also discloses an antistatic film. Wherein, the antistatic film comprises a substrate and a carbon nano tube coating. In order to improve the light transmittance of the entire antistatic film, the base material may be made of a flexible transparent material, so that the base material is transparent. The thickness of the carbon nanotube coating may be 100nm to 10 μm.
The carbon nanotube coating may be formed by forming an antistatic coating liquid of carbon nanotubes on the surface of a substrate, curing, and rinsing with an organic extraction solvent.
The flexible transparent material can be a flexible transparent film material such as Polyester (PET), polystyrene (PS), polymethyl methacrylate (PMMA), polycarbonate (PC) and the like. The thickness of the substrate may be 5-150 μm.
The antistatic film can be used as a film material of a flexible transparent electrothermal film, electrothermal deicing, electrothermal defogging, an intelligent window film and the like, can also be used in the fields of antistatic, shielding, transparent induction films and the like, and has the advantages of high conductivity, high light transmittance, stable conductivity and the like.
The antistatic film and the method for preparing the same according to the present invention will be described in detail with reference to specific examples.
Example 1
Dispersing carbon nanotubes, a dispersing agent, a dispersion wetting agent and the like according to a formula table of the carbon nanotube dispersion liquid by a nano grinding process, wherein a grinding medium is zirconia beads with the diameter of 0.8 mm, the linear speed of a dispersion disc is 10 m/s, grinding is carried out for 10 times, then high-pressure homogenization is carried out for 5 times under 100MPa, and a 300-mesh filter screen is used for filtering to prepare the carbon nanotube dispersion liquid. And then mixing the antistatic coating liquid with resin and an auxiliary agent according to the formula of the antistatic coating liquid to prepare the antistatic coating liquid. The antistatic coating liquid is used for scraping the surface of a PET substrate (the thickness of which is 50 micrometers) by a No. 3 bar, baked for 5 minutes at 120 ℃, soaked and rinsed for 10 seconds by chloroform, and then air-dried, so that the antistatic film is obtained. The surface resistance and the light transmittance of the film are tested by a four-probe tester, and the adhesive force of the surface carbon nano tube is tested by a 3M adhesive tape.
Example 2
Dispersing carbon nanotubes, a dispersing agent, a dispersion wetting agent and the like according to a formula table of the carbon nanotube dispersion liquid by a nano grinding process, wherein a grinding medium is zirconia beads with the diameter of 0.4 mm, the linear speed of a dispersion disc is 4 m/s, grinding is carried out for 20 times, then high-pressure homogenization is carried out for 5 times under 50MPa, and a 300-mesh filter screen is used for filtering to prepare the carbon nanotube dispersion liquid. And then mixing the antistatic coating liquid with resin and an auxiliary agent according to the formula of the antistatic coating liquid to prepare the antistatic coating liquid. The antistatic coating solution is used for scraping the surface of a PS substrate (the thickness of which is 50 micrometers) by a No. 3 bar, baked for 10 minutes at 120 ℃, soaked and rinsed for 10 seconds by chloroform, and then air-dried, so that the antistatic film is obtained. The surface resistance and the light transmittance of the film are tested by a four-probe tester, and the adhesive force of the surface carbon nano tube is tested by a 3M adhesive tape.
Example 3
Dispersing carbon nanotubes, a dispersing agent, a dispersion wetting agent and the like according to a formula table of the carbon nanotube dispersion liquid by a nano grinding process, wherein a grinding medium is zirconia beads with the diameter of 1.0 mm, the linear speed of a dispersion disc is 8 m/s, grinding is carried out for 5 times, then high-pressure homogenization is carried out for 5 times under 100MPa, and a 300-mesh filter screen is used for filtering to prepare the carbon nanotube dispersion liquid. And then mixing the antistatic coating liquid with resin and an auxiliary agent according to the formula of the antistatic coating liquid to prepare the antistatic coating liquid. The antistatic coating liquid is used for scraping the surface of a PC substrate (with the thickness of 100 micrometers) by a No. 3 bar, baked for 5 minutes at 120 ℃, soaked and rinsed for 10 seconds by toluene, and then air-dried, so that the antistatic film is obtained. The surface resistance and the light transmittance of the film are tested by a four-probe tester, and the adhesive force of the surface carbon nano tube is tested by a 3M adhesive tape.
Example 4
Dispersing carbon nanotubes, a dispersing agent, a dispersion wetting agent and the like according to a formula table of the carbon nanotube dispersion liquid by a nano grinding process, wherein a grinding medium is zirconia beads with the diameter of 1.0 mm, the linear speed of a dispersion disc is 8 m/s, grinding is carried out for 5 times, then high-pressure homogenization is carried out for 8 times under 150MPa, and a 300-mesh filter screen is used for filtering to prepare the carbon nanotube dispersion liquid. And then mixing the antistatic coating liquid with resin and an auxiliary agent according to the formula of the antistatic coating liquid to prepare the antistatic coating liquid. The antistatic coating liquid is used for scraping the surface of a PET substrate (the thickness of which is 80 microns) by a No. 3 bar, baked for 5 minutes at 120 ℃, soaked and rinsed for 10 seconds by chloroform, and then air-dried, so that the antistatic film is obtained.
Example 5
Dispersing carbon nanotubes, a dispersing agent, a dispersion wetting agent and the like according to a formula table of the carbon nanotube dispersion liquid by a nano grinding process, wherein a grinding medium is zirconia beads with the diameter of 0.6 mm, the linear speed of a dispersion disc is 10 m/s, grinding is carried out for 10 times, then high-pressure homogenization is carried out for 5 times under 150MPa, and a 300-mesh filter screen is used for filtering to prepare the carbon nanotube dispersion liquid. And then mixing the antistatic coating liquid with resin and an auxiliary agent according to the formula of the antistatic coating liquid to prepare the antistatic coating liquid. The antistatic coating liquid is used for scraping the surface of a PET substrate (with the thickness of 150 micrometers) by a No. 3 bar, baked for 10 minutes at 120 ℃, soaked and rinsed for 10 seconds by chloroform, and then air-dried, so that the antistatic film is obtained. The surface resistance and the light transmittance of the film are tested by a four-probe tester, and the adhesive force of the surface carbon nano tube is tested by a 3M adhesive tape.
Example 6
Dispersing carbon nanotubes, a dispersing agent, a dispersion wetting agent and the like according to a formula table of the carbon nanotube dispersion liquid by a nano grinding process, wherein a grinding medium is zirconia beads with the diameter of 0.8 mm, the linear speed of a dispersion disc is 10 m/s, grinding is carried out for 10 times, then high-pressure homogenization is carried out for 5 times under 100MPa, and a 300-mesh filter screen is used for filtering to prepare the carbon nanotube dispersion liquid. And then mixing the antistatic coating liquid with resin and an auxiliary agent according to the formula of the antistatic coating liquid to prepare the antistatic coating liquid. The antistatic coating liquid is used for scraping the surface of a PET substrate (the thickness of which is 50 micrometers) by a No. 3 bar, baked for 5 minutes at 120 ℃, soaked and rinsed for 10 seconds by chloroform, and then air-dried, so that the antistatic film is obtained. The surface resistance and the light transmittance of the film are tested by a four-probe tester, and the adhesive force of the surface carbon nano tube is tested by a 3M adhesive tape.
Example 7
Dispersing carbon nanotubes, a dispersing agent, a dispersion wetting agent and the like according to a formula table of the carbon nanotube dispersion liquid by a nano grinding process, wherein a grinding medium is zirconia beads with the diameter of 0.8 mm, the linear speed of a dispersion disc is 10 m/s, grinding is carried out for 10 times, then high-pressure homogenization is carried out for 5 times under 100MPa, and a 300-mesh filter screen is used for filtering to prepare the carbon nanotube dispersion liquid. And then mixing the antistatic coating liquid with resin and an auxiliary agent according to the formula of the antistatic coating liquid to prepare the antistatic coating liquid. The antistatic coating liquid is used for scraping the surface of a PET substrate (the thickness of which is 50 micrometers) by a No. 3 bar, baked for 5 minutes at 120 ℃, soaked and rinsed for 10 seconds by chloroform, and then air-dried, so that the antistatic film is obtained. The surface resistance and the light transmittance of the film are tested by a four-probe tester, and the adhesive force of the surface carbon nano tube is tested by a 3M adhesive tape.
Example 8
Dispersing carbon nanotubes, a dispersing agent, a dispersion wetting agent and the like according to a formula table of the carbon nanotube dispersion liquid by a nano grinding process, wherein a grinding medium is zirconia beads with the diameter of 1.0 mm, the linear speed of a dispersion disc is 8 m/s, grinding is carried out for 5 times, then high-pressure homogenization is carried out for 8 times under 150MPa, and a 300-mesh filter screen is used for filtering to prepare the carbon nanotube dispersion liquid. And then mixing the antistatic coating liquid with resin and an auxiliary agent according to the formula of the antistatic coating liquid to prepare the antistatic coating liquid. The antistatic coating liquid is used for scraping the surface of a PET substrate (the thickness of which is 80 microns) by a No. 3 bar, baked for 5 minutes at 120 ℃, soaked and rinsed for 10 seconds by chloroform, and then air-dried, so that the antistatic film is obtained.
Comparative example 1
This comparative example uses the same formulation as example 1, except that the antistatic coating liquid has no olefin emulsion and the organic solvent extraction step.
Comparative example 2
This comparative example uses the same formulation as example 2, except that the antistatic coating liquid has no olefin emulsion and the organic solvent extraction step.
Comparative example 3
This comparative example was conducted in substantially the same manner as in example 4 except that only few-wall carbon nanotubes (tube diameter 2-5nm, tube wall 6-8 layers) were selected as the carbon nanotubes.
The antistatic films obtained in examples 1 to 8 and comparative examples 1 to 3 were subjected to the following performance tests: 1. the surface resistance was measured with a four-probe meter. 2. The visible light transmittance tester tests the light transmittance of the film. 3. The surface layer carbon nanotubes were tested for adhesion using 3M tape.
Table 1: summary of examples and comparative examples data
From table 1, the data of the light transmittance and the surface resistance of example 1 are significantly better than those of comparative example 1. And the data of the light transmittance and the surface resistance of example 2 are significantly superior to those of comparative example 2. It can be known that in the process of preparing the antistatic film, an olefin emulsion is added into the antistatic liquid coating liquid, and olefin emulsion particles on the surface of the substrate layer are dissolved by using an organic extraction solvent in the later period, and a discrete oil phase pool is formed by utilizing the phase separation effect of the olefin emulsion and the carbon nano tube in the drying and curing process, so that the carbon nano tube is pushed to form a grid patterning structure, and then the patterned carbon nano tube conductive network is obtained after the extraction of the organic extraction solvent. The patterned carbon nanotube conductive network has the characteristics of stable conductive network and low surface coverage rate, the conductive network can improve the conductivity of the antistatic film, and the low surface coverage rate can improve the light transmittance of the antistatic film, so that the antistatic film has the performance of both high conductivity and high light transmittance. From table 1, the transmittance of example 8 is better than that of example 4, and the surface resistance of example 8 is better than that of example 4, and it is known that the selection of the single-walled carbon nanotubes can significantly improve the transmittance of the antistatic film, and also has good conductivity.
From table 1, the data of the transmittance and the surface resistance of example 4 are both data superior to those of comparative example 3, and it can be seen that when the number of tube wall layers of the few-wall carbon nanotubes is more than 5, the conductivity of the single few-wall carbon nanotube is enhanced, but the weight of the single few-wall carbon nanotube is increased, resulting in a decrease in the number of few-wall carbon nanotubes, an unstable conductive network formed of carbon nanotubes, and thus a deterioration in the conductivity of the macroscopically antistatic film, and a significant decrease in the transmittance of the antistatic film.
It should be noted that the range of values of the surface resistance in the performance test is due to the fact that in the process of coating the carbon nanotube coating on the surface of the substrate, the small difference in the thickness of the carbon nanotube coating may cause the different values of the surface resistance of different test points, and the possibility is that the uneven distribution of the carbon nanotubes may cause the different values of the surface resistance of different test points. In addition, the data deviation of the surface resistance is larger by the conventional carbon tube dispersion technology. It should be understood that this example is only partially illustrated by way of example, and the above-described ranges of the mass percentages of the components and the ranges of the specific components selected for the components can achieve the object of the present invention, that is, the antistatic film prepared by the method of the present invention can obtain more excellent light transmittance while ensuring excellent conductivity, and will not be illustrated herein.
It is also clear from the data of table 1 that the more the content of carbon nanotubes in the antistatic film as a whole, the better the conductivity, but the corresponding light transmittance becomes worse.
In conclusion, the antistatic film prepared by the method provided by the invention has the advantages that excellent conductivity is ensured, meanwhile, more excellent light transmittance is obtained, and the combination of high light transmittance and high conductivity is realized, so that the antistatic film is a transparent antistatic film with excellent comprehensive performance.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (9)

1. A method for producing an antistatic film, comprising the steps of:
obtaining an aqueous dispersion of carbon nanotubes;
uniformly mixing the carbon nanotube aqueous dispersion liquid, the aqueous binding resin, the olefin emulsion, water and the auxiliary agent to obtain carbon nanotube antistatic coating liquid;
coating the antistatic coating liquid of the carbon nano tube on the surface of a substrate, and curing to obtain an antistatic film original film; and
rinsing the antistatic film raw film in an organic extraction solvent to obtain the antistatic film;
wherein the melting point of olefin in the olefin emulsion is less than 70 ℃, and the olefin emulsion is paraffin emulsion or white oil emulsion.
2. The method for preparing an antistatic film according to claim 1, wherein the carbon nanotube aqueous dispersion comprises the following raw material components in percentage by mass:
3. the method for producing an antistatic film according to claim 2, wherein the carbon nanotubes are single-walled carbon nanotubes or few-walled carbon nanotubes, and the few-walled carbon nanotubes are carbon nanotubes having a wall layer number of less than 5 layers; and/or the diameter of the carbon nano tube is 0.4-4nm.
4. The method for producing an antistatic film according to claim 2, wherein the dispersant is one or more of a cationic surfactant, an anionic surfactant and a nonionic surfactant.
5. The method for producing an antistatic film according to claim 4, wherein the dispersant is composed of an anionic surfactant and a nonionic surfactant, and the mass ratio of the anionic surfactant to the nonionic surfactant is (1-10): 1.
6. the method for producing an antistatic film according to claim 2, wherein the step of obtaining an aqueous dispersion of carbon nanotubes comprises: uniformly dispersing the carbon nano tube, the dispersing agent and the dispersing liquid wetting agent in water by adopting nano grinding and high-pressure homogenizing dispersing means, and filtering by using a 300-600 mesh filter screen to obtain the carbon nano tube aqueous dispersing liquid.
7. The method for producing an antistatic film according to claim 1, wherein the auxiliary agent comprises a leveling agent and a base material wetting agent.
8. The method for preparing an antistatic film according to claim 7, wherein the carbon nanotube antistatic coating liquid comprises the following raw material components in percentage by weight:
9. an antistatic film prepared by the method according to any one of claims 1 to 8, wherein the antistatic film comprises a substrate and a carbon nanotube coating formed on the substrate, the substrate is made of a flexible transparent material, and the thickness of the carbon nanotube coating is 100nm to 10 μm.
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