Antistatic composite board and method for producing the same

Abstract

This invention discloses an antistatic composite board and its manufacturing method. The antistatic composite board comprises a PET substrate, a PET film formed on one side of the PET substrate, and a coating layer formed on the PET film by applying a coating liquid. The coating liquid comprises a polyurethane oligomer, an antistatic agent, and a solvent. The antistatic agent comprises a first dispersant and a plurality of carbon nanotubes dispersed in the first dispersant. Based on a total weight of 100 wt% of the coating liquid, the content of the polyurethane oligomer is between 30 wt% and 40 wt%, the content of the antistatic agent is between 5 wt% and 20 wt%, and the content of the solvent is between 40 wt% and 60 wt%. The antistatic composite board has a light transmittance greater than or equal to 84%, a haze less than or equal to 4%, and a surface resistivity less than or equal to 107 Ω.

Description

[Technical Field]

[0001] This invention relates to a composite board and its manufacturing method, and particularly to an antistatic composite board and its manufacturing method. [Previous Technology]

[0002] Existing antistatic boards contain organic antistatic agents to improve antistatic properties, but organic antistatic agents have poor heat resistance and the antistatic properties they provide are not durable. Other existing antistatic boards contain inorganic antistatic agents, but inorganic antistatic agents have poor dispersibility, which can easily affect the optical properties of the antistatic board. [Summary of the Invention]

[0003] The technical problem to be solved by the present invention is to provide an antistatic composite board and its manufacturing method in view of the shortcomings of the prior art, so as to effectively improve the problem that the optical properties of the existing antistatic board are affected by the addition of inorganic antistatic agents with poor dispersibility.

[0004] To solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention is to provide an antistatic composite board, comprising: a PET substrate; a PET film formed on one side of the PET substrate; and a coating layer formed on the side of the PET film away from the PET substrate by applying a coating liquid; wherein the coating liquid has a viscosity between 20 cps and 40 cps, and the coating liquid comprises: a polyurethane oligomer; an antistatic agent; wherein the antistatic agent comprises a dispersant and a plurality of carbon nanotubes dispersed in the dispersant, and the weight ratio of the carbon nanotubes to the dispersant can be between 99:1 and 99.9:0.1; and a solvent; wherein the solvent is propylene glycol methyl ether acetate (PMA); wherein, based on a total weight of 100 wt% of the coating liquid, the content of the polyurethane oligomer is between 30 wt% and 40 wt%, the content of the antistatic agent is between 5 wt% and 20 wt%, and the content of the solvent is between 40 wt%. Between wt% and 60 wt%; wherein the antistatic composite board has a light transmittance greater than or equal to 84%, a haze less than or equal to 4%, and a surface resistivity less than or equal to 10 7 Ω.

[0005] Preferably, the thickness of the PET substrate is between 1.5 mm and 2.5 mm, the thickness of the PET film is between 60 micrometers and 150 micrometers, and the thickness of the coating is between 2 micrometers and 8 micrometers.

[0006] Preferably, the length of each of the carbon nanotubes is between 5 micrometers and 8 micrometers, and the diameter of each of the carbon nanotubes is between 1.2 nanometers and 2 nanometers.

[0007] Preferably, the coating liquid further comprises a photoinitiator and a dispersant; wherein, based on the total weight of the coating liquid being 100 wt%, the content of the photoinitiator is between 0.1 wt% and 2 wt%, and the content of the dispersant is between 0.1 wt% and 3 wt%; wherein the photoinitiator is 1-hydroxycyclohexylbenzophenone, and the dispersant is selected from at least one of the materials group consisting of styrene-maleic anhydride copolymer and basic polymer pigment dispersants.

[0008] Preferably, the antistatic composite board includes two PET films and two coatings, the two PET films are disposed on both sides of the PET substrate, and each of the coatings is disposed on the side of one of the PET films away from the PET substrate.

[0009] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a method for manufacturing an antistatic composite board, which includes: a mixing step, wherein a polyurethane oligomer and an antistatic agent are added to a solvent and stirred at a speed between 600 rpm and 1,000 rpm for 5 minutes to 15 minutes to obtain a coating liquid; wherein the coating liquid has a concentration between 20 cps and 40 cps. The viscosity between cps; wherein the antistatic agent comprises a dispersant and a plurality of carbon nanotubes dispersed in the dispersant, and the weight ratio of the carbon nanotubes to the dispersant can be between 99:1 and 99.9:0.1; a coating step, coating the coating liquid onto a PET film to form a coating on one side of the PET film; a heat bonding step, bonding the PET film with the coating formed onto a PET substrate at a temperature between 40°C and 70°C to form an antistatic composite board; wherein the solvent is propylene glycol methyl ether acetate (PMA); wherein, based on a total weight of 100 wt% of the coating liquid, the content of the polyurethane oligomer is between 30 wt% and 40 wt%, the content of the antistatic agent is between 5 wt% and 20 wt%, and the content of the solvent is between 40 wt% and 60 wt%. Between wt%; wherein the antistatic composite board has a light transmittance greater than or equal to 84%, a haze less than or equal to 4%, and a surface resistivity less than or equal to 10 7Ω.

[0010] Preferably, in the mixing step, a photoinitiator and a dispersant are further added; wherein, based on the total weight of the coating liquid being 100 wt%, the content of the photoinitiator is between 0.1 wt% and 2 wt%, and the content of the dispersant is between 0.1 wt% and 3 wt%; wherein the photoinitiator is 1-hydroxycyclohexylbenzophenone, and the dispersant is selected from at least one of the materials group consisting of styrene-maleic anhydride copolymer and basic polymer pigment dispersants.

[0011] Preferably, after the coating step and before the thermal bonding step, the method for manufacturing the antistatic composite board further includes a photocuring step, wherein the PET film on which the coating is formed is photocured with a light intensity between 500 mJ / cm2 and 1000 mJ / cm2.

[0012] Preferably, the length of each of the carbon nanotubes is between 5 micrometers and 8 micrometers, and the diameter of each of the carbon nanotubes is between 1.2 nanometers and 2 nanometers.

[0013] Preferably, the thickness of the PET substrate is between 1.5 mm and 2.5 mm, the thickness of the PET film is between 60 micrometers and 150 micrometers, and the thickness of the coating is between 2 micrometers and 8 micrometers.

[0014] One of the beneficial effects of the present invention is that the antistatic composite board and its manufacturing method provided by the present invention can effectively improve the problem that the optical properties of existing antistatic boards are affected by the addition of inorganic antistatic agents with poor dispersibility through the technical solution of "based on the total weight of the coating liquid being 100 wt%, the content of the polyurethane oligomer being between 30 wt% and 40 wt%, the content of the antistatic agent being between 5 wt% and 20 wt%, and the content of the solvent being between 40 wt% and 60 wt%" and "the antistatic agent comprising a dispersant and a plurality of carbon nanotubes dispersed in the dispersant, and the weight ratio of the carbon nanotubes to the dispersant being between 99:1 and 99.9:0.1".

[0015] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention.

Implementation Method

[0021] The following specific embodiments illustrate the implementation of the "antistatic composite board and its manufacturing method" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. Furthermore, the accompanying drawings of this invention are for simple illustrative purposes only and are not depictions of actual dimensions; this is stated in advance. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention.

[0022] It should be understood that although terms such as “first,” “second,” and “third” may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. In addition, the term “or” as used herein may include, as appropriate, any combination of any one or more of the associated listed items.

[0023] [Antistatic Composite Board]

[0024] Referring to Figure 1, Figure 1 is a schematic diagram of an antistatic composite board according to one embodiment of the present invention. The present invention provides an antistatic composite board 100. The antistatic composite board 100 includes a PET substrate 1, a PET film 2, and a coating 3. The PET film 2 is formed on one side of the PET substrate 1, and the coating 3 is formed on the side of the PET film 2 away from the PET substrate 1 by applying a coating liquid. The coating liquid has a viscosity between 20 cps and 40 cps.

[0025] In this embodiment, the PET substrate 1 can be formed, for example, by extruding PET masterbatch of Nan Ya Manufacturing Model 3842 using an extruder, and the five temperature zones of the extruder are 250°C, 260°C, 260°C, 260°C, and 260°C, respectively. After extrusion, the PET substrate 1 can be cooled by a first forming roller, a second forming roller, and a third forming roller and formed at a take-up roller speed of 1 meter / minute. The temperature of the first forming roller is between 35°C and 45°C (preferably 40°C), the temperature of the second forming roller is between 35°C and 45°C (preferably 40°C), and the temperature of the third forming roller is between 60°C and 70°C (preferably 65°C). Furthermore, the PET film 2 can be, for example, a PET film of Nan Ya Manufacturing Model LL226, but the present invention is not limited thereto.

[0026] In this embodiment, the thickness of the PET substrate 1 is between 1.5 mm and 2.5 mm, the thickness of the PET film 2 is between 60 micrometers and 150 micrometers, and the thickness of the coating 3 is between 2 micrometers and 8 micrometers, but the present invention is not limited thereto. Preferably, the thickness of the PET substrate 1 is between 1.8 mm and 2.2 mm, the thickness of the PET film 2 is between 80 micrometers and 125 micrometers, and the thickness of the coating 3 is between 4 micrometers and 6 micrometers.

[0027] The coating liquid comprises a polyurethane oligomer, an antistatic agent, and a solvent. The solvent is propylene glycol methyl ether acetate (PMA). Based on a total weight of 100 wt% of the coating liquid, the content of the polyurethane oligomer is between 30 wt% and 40 wt%, the content of the antistatic agent is between 5 wt% and 20 wt%, and the content of the solvent is between 40 wt% and 60 wt%. Preferably, based on a total weight of 100 wt% of the coating liquid, the content of the polyurethane oligomer is between 32.5 wt% and 37.5 wt%, the content of the antistatic agent is between 10 wt% and 20 wt%, and the content of the solvent is between 45 wt% and 55 wt%.

[0028] The polyurethane oligomer may be, for example, a polyurethane acrylate oligomer (such as Dong-A Synthetic Manufacturing Co., Ltd., model TJ-UA2001). The antistatic agent comprises a dispersant and a plurality of carbon nanotubes dispersed in the dispersant, and the weight ratio of the carbon nanotubes to the dispersant may be between 95:5 and 99.9:0.1. Preferably, the weight ratio of the carbon nanotubes to the dispersant may be between 99:1 and 99.9:0.1.

[0029] In other words, the carbon nanotubes may be pre-dispersed in the dispersant to form the antistatic agent, so that the carbon nanotubes can be better dispersed in the coating liquid. The dispersant may be, for example, propylene glycol methyl ether acetate (PMA), but the invention is not limited thereto. In addition, the material of the dispersant may be the same as the material of the solvent, so that the antistatic agent can be better dispersed in the coating liquid.

[0030] In this embodiment, the length of each carbon nanotube is between 5 micrometers and 8 micrometers, and the diameter of each carbon nanotube is between 1.2 nanometers and 2 nanometers, but the invention is not limited thereto. Preferably, the length of each carbon nanotube is between 5.5 micrometers and 7.5 micrometers, and the diameter of each carbon nanotube is between 1.4 nanometers and 1.8 nanometers. The carbon nanotubes may be, for example, MATRIX 208 manufactured by TUBLALL™, but the invention is not limited thereto.

[0031] The coating liquid may further comprise a photoinitiator and a dispersant. Based on a total weight of 100 wt% of the coating liquid, the content of the photoinitiator is between 0.1 wt% and 2 wt%, and the content of the dispersant is between 0.1 wt% and 3 wt%. In this embodiment, the photoinitiator is 1-hydroxycyclohexylbenzophenone (such as Irgacure 184), and the dispersant is selected from at least one of the materials group consisting of styrene-maleic anhydride copolymers (such as BYK-2013) and basic polymeric pigment dispersants (such as Ajinomoto PB821), but the present invention is not limited thereto.

[0032] The antistatic composite board 100 has a light transmittance greater than or equal to 84%, a haze less than or equal to 4%, and a surface resistivity less than or equal to 10⁷ Ω. Preferably, the antistatic composite board 100 has a light transmittance between 84% and 88% and a haze between 1% and 4%.

[0033] Please refer to Figure 2, which is a schematic diagram of an antistatic composite board according to another embodiment of the present invention. The antistatic composite board 100 includes two PET films 2 and two coatings 3. The two PET films 2 are disposed on both sides of the PET substrate 1, and each of the coatings 3 is disposed on the side of one of the PET films 2 away from the PET substrate 1.

[0034] [Manufacturing method of antistatic composite board]

[0035] Please refer to Figure 3, which is a schematic diagram of a method for manufacturing an antistatic composite board according to one embodiment of the present invention. The present invention also provides a method for manufacturing an antistatic composite board. The aforementioned antistatic composite board can be obtained by performing the aforementioned method for manufacturing an antistatic composite board, but the present invention is not limited thereto. The method for manufacturing an antistatic composite board includes a mixing step S110, a coating step S120, and a thermal bonding step S130. Of course, the method for manufacturing an antistatic composite board may include other steps as needed, and the present invention is not limited thereto.

[0036] In the mixing step S110, a polyurethane oligomer and an antistatic agent are added to a solvent and stirred at a speed between 600 rpm and 1,000 rpm for 5 to 15 minutes to obtain a coating solution. Preferably, in the mixing step S110, the polyurethane oligomer, the antistatic agent, and the solvent are stirred at a speed of 700 rpm to 900 rpm (more preferably about 800 rpm). The coating solution has a viscosity between 20 cps and 40 cps. The solvent is propylene glycol methyl ether acetate (PMA). Based on a total weight of 100 wt% for the coating solution, the content of the polyurethane oligomer is between 30 wt% and 40 wt%, the content of the antistatic agent is between 5 wt% and 20 wt%, and the content of the solvent is between 40 wt% and 60 wt%.

[0037] Preferably, in the mixing step S110, the polyurethane oligomer may be mixed with a portion of the solvent to obtain a first solution, and the antistatic agent may be mixed with another portion of the solvent to obtain a second solution. The first solution and the second solution are then mixed and stirred at a speed between 600 rpm and 1,000 rpm for 5 to 15 minutes to obtain the coating liquid. Furthermore, the weight ratio between the solution in the first solution and the solvent in the second solution may be, for example, between 1:1.5 and 1.5:1, but the invention is not limited thereto.

[0038] The antistatic agent comprises a dispersant and a plurality of carbon nanotubes dispersed in the dispersant, and the weight ratio of the carbon nanotubes to the dispersant may be between 99:1 and 99.9:0.1. The length of each carbon nanotube is between 5 micrometers and 8 micrometers, and the diameter of each carbon nanotube is between 1.2 nanometers and 2 nanometers.

[0039] Please refer to Figure 4, which is a schematic diagram of a method for manufacturing an antistatic composite board according to another embodiment of the present invention. In the mixing step S110a of one embodiment, a photoinitiator and a dispersant are also added. Based on the total weight of the coating liquid being 100 wt%, the content of the photoinitiator is between 0.1 wt% and 2 wt%, and the content of the dispersant is between 0.1 wt% and 3 wt%. The photoinitiator is 1-hydroxycyclohexylbenzophenone, and the dispersant is selected from at least one of the materials group consisting of styrene-maleic anhydride copolymer and basic polymeric pigment dispersant. More specifically, the photoinitiator may be added to the first solution, and the dispersant may be added to the second solution, and then the first solution and the second solution are mixed and stirred to form the coating liquid. Accordingly, the antistatic agent can be better dispersed in the coating liquid.

[0040] In the coating step S120, the coating liquid is applied to a PET film 2 to form a coating 3 on one side of the PET film 2. In the heat bonding step S130, the PET film 2 with the coating 3 formed is bonded to a PET substrate 1 at a temperature between 40°C and 70°C to form an antistatic composite board 100. The thickness of the PET substrate 1 is between 1.5 mm and 2.5 mm, the thickness of the PET film 2 is between 60 micrometers and 150 micrometers, and the thickness of the coating 3 is between 2 micrometers and 8 micrometers.

[0041] Please refer to Figure 5, which is a schematic diagram of a method for manufacturing an antistatic composite board according to another embodiment of the present invention. In one embodiment, after the coating step S120 and before the thermal bonding step S130, the method for manufacturing the antistatic composite board may further include a photocuring step S121, in which the PET film on which the coating 3 is formed is photocured with a light intensity between 500 mJ / cm² and 1000 mJ / cm².

[0042] Furthermore, prior to the thermal bonding step S130, the manufacturing method of the antistatic composite board may further include an extrusion molding step S122, in which PET masterbatch is extruded using an extruder, and then cooled by a first molding roller, a second molding roller, and a third molding roller, and molded at a take-up roller speed of 1 meter / minute to form the PET substrate 1. The temperature of the first molding roller is between 35°C and 45°C (preferably 40°C), the temperature of the second molding roller is between 35°C and 45°C (preferably 40°C), and the temperature of the third molding roller is between 60°C and 70°C (preferably 65°C). The five temperature zones of the extruder are 250°C, 260°C, 260°C, 260°C, and 260°C, respectively.

[0043] The antistatic composite board 100 obtained by the manufacturing method of the antistatic composite board has a light transmittance of greater than or equal to 84%, a haze of less than or equal to 4%, and a surface resistivity of less than or equal to 10 7Ω.

[0044] [Experimental Data Test]

[0045] The component ratio formulation and physicochemical property test results of the exemplary and comparative examples are shown in Table 1 below. The process parameters of the exemplary and comparative examples are shown in Table 2 below. The light irradiation test results of the exemplary examples are shown in Table 3 below. The relevant test methods are explained below.

[0046] Haze test: The haze was tested according to the ASRMD-1003 standard using a haze meter (model: NDK NDH7000).

[0047] Surface resistivity test: The test was performed according to ASTM D-257 using a surface resistivity measuring instrument (model: OHM-STAT RT-1000).

[0048] Light transmittance test: The test was conducted using a haze meter (model: NDK NDH7000) according to the ASRMD-1003 standard.

[0049] Thickness measurement: The thickness was measured using a magnetic film thickness gauge (model: KETT LZ-990).

[0050] Pencil hardness test: The test was conducted using a pencil hardness tester (model: B-3084T3) according to the JIS K 5400 standard.

[0051] Abrasion resistance test: Abrasion tester (model: A20-339) is tested in the following two ways: (1) 1kg pressure with a dust-free wiping cloth and 50% IPA is used to wipe back and forth 1500 times to test solvent resistance (2) 1500 times is used to wipe back and forth with #0000 steel wool to test steel wool resistance.

[0052] Aging test: The optical properties of the samples were analyzed after the samples were irradiated with different light sources using a Cofomegra ultraviolet accelerated aging tester.

[0053] [Table 1: Component ratio formulation and physicochemical property test results of the exemplary and comparative examples] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 solvent IPA 64% MEK 64% EAC 64% water 64% Oligomers polyurethane 20% 20% 20% 20% Photoinitiator I184 1% 1% 1% 1% Antistatic agent Tin oxide antimony particle (SP2002) 15% 15% 15% 15% Coating appearance evaluation PASS precipitation precipitation PASS Light transmittance (%) 89.18 88.55 89.57 89.35 Haze (%) 27.21 50.40 51.07 31.35 Surface resistivity (Ω) 10 9 10 7 10 8 10 8 Solvent-resistant wipe Surface resistivity (Ω) 10 12 10 11 10 11 10 11 After wiping with steel wool Surface resistivity (Ω) 10 12 10 11 10 11 10 12 Pencil hardness HB HB HB HB membrane appearance Difference Difference Difference Difference Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 solvent EAC 49% 49% 49% PMA 49% Oligomers Polyurethane acrylic 35% 35% 35% 35% Photoinitiator I184 1% 1% 1% 1% Antistatic agent Tin oxide antimony particles (SP2002) 15% Ionic liquids (AS100) 15% Carbon nanotubes (TUBALL) 15% 15% Coating appearance evaluation Gathering PASS Micro-aggregation Micro-aggregation Light transmittance (%) 88.30 86.30 82.52 84.52 Haze (%) 35.20 3.20 2.45 2.02 Surface resistivity (Ω) 10 8 10 9 10 7 10 7 Solvent-resistant wipe Surface resistivity (Ω) 1011 10 12 10 8 10 8 After wiping with steel wool Surface resistivity (Ω) 10 12 10 12 10 8 10 8 Pencil hardness 2H 2H 2H 2H membrane appearance generally good generally generally Comparative Example 9 Comparative Example 10 Comparative Example 11 Comparative Example 12 Example 1 solvent EAC 48.5% 49% 49% PMA 49% 48% Oligomers Polyurethane acrylic 35% 35% 35% 35% 35% Photoinitiator I184 1% 1% 1% 1% 1% Antistatic agent Carbon nanotubes (TUBALL) 15% 15% 15% 15% 15% Additives BYK-154 0.5% BYK-UV3575 0.5% BYK-2013 0.5% 0.5% PB821 0.5% 0.5% Coating appearance evaluation Micro-aggregation Micro-aggregation PASS PASS PASS Light transmittance (%) 82.4 83.41 85.50 85.81 86.06 Haze (%) 2.08 1.75 2.51 1.99 1.59 Surface resistivity (Ω) 10 9 10 7 10 7 10 7 10 7 Solvent-resistant wipe Surface resistivity (Ω) 10 11 10 10 10 8 10 8 10 8 After wiping with steel wool Surface resistivity (Ω) 10 12 10 11 10 8 10 8 10 8 Pencil hardness 2H 2H 2H 2H 2H membrane appearance generally generally generally generally good

[0054] [Table 2 Process Parameter Conditions for Exemplary and Comparative Examples] Test number Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Temperature of the first forming wheel (°C) 40 40 40 40 40 Temperature of the second forming wheel (°C) 40 40 40 40 40 Temperature of the third type wheel (°C) 80 72 65 65 65 Extraction wheel (M / min) 1 1 2.5 2 1 Extrusion test 1 2 3 4 5 Plate thickness (mm) - 1.8 0.8 1.4 2 Appearance Adhesion Warp No abnormalities No abnormalities No abnormalities

[0055] [Table 3: Results of Light Test for Example Cases After 1000 Hours] wavelength 313nm 340nm Xenon arc lamp Light transmittance (%) 84.43 84.31 85.01 Haze (%) 3.87 3.58 2.23

[0056] [Beneficial Effects of the Embodiments]

[0057] One of the beneficial effects of the present invention is that the antistatic composite board and its manufacturing method provided by the present invention can effectively improve the problem that the optical properties of existing antistatic boards are affected by the addition of inorganic antistatic agents with poor dispersibility by means of the technical solution of "based on the total weight of the coating liquid being 100 wt%, the content of the polyurethane oligomer being between 30 wt% and 40 wt%, the content of the antistatic agent being between 5 wt% and 20 wt%, and the content of the solvent being between 40 wt% and 60 wt%" and "the antistatic agent comprising a dispersant and a plurality of carbon nanotubes dispersed in the dispersant, and the weight ratio of the carbon nanotubes to the dispersant being between 99:1 and 99.9:0.1".

[0058] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention. [Simplified Explanation of the Diagram]

[0016] Figure 1 is a schematic diagram of an antistatic composite board according to one embodiment of the present invention.

[0017] Figure 2 is a schematic diagram of an antistatic composite board according to another embodiment of the present invention.

[0018] Figure 3 is a schematic diagram of a method for manufacturing an antistatic composite board according to one embodiment of the present invention.

[0019] Figure 4 is a schematic diagram of a method for manufacturing an antistatic composite board according to another embodiment of the present invention.

[0020] Figure 5 is a schematic diagram of a method for manufacturing an antistatic composite board according to another embodiment of the present invention.

Claims

1. An antistatic composite board, comprising: A PET substrate; A PET film is formed on one side of the PET substrate; The coating is formed on the side of the PET film away from the PET substrate by applying a coating liquid; wherein the coating liquid has a viscosity between 20 cps and 40 cps, and the coating liquid comprises: a polyurethane oligomer; an antistatic agent; wherein the antistatic agent comprises a first dispersant and a plurality of carbon nanotubes dispersed in the first dispersant, and the weight ratio of the carbon nanotubes to the first dispersant may be between 99:1 and 99.9:0.1; and a solvent; wherein the solvent is propylene glycol methyl ether acetate (PMA); wherein, based on a total weight of 100 wt% of the coating liquid, the content of the polyurethane oligomer is between 30 wt% and 40 wt%, the content of the antistatic agent is between 5 wt% and 20 wt%, and the content of the solvent is between 40 wt% and 60 wt%. The antistatic composite board has a light transmittance of ≥84%, a haze of ≤4%, and a surface resistivity of ≤107Ω. The coating liquid further comprises a photoinitiator and a second dispersant. Based on a total weight of 100 wt% of the coating liquid, the content of the photoinitiator is between 0.1 wt% and 2 wt%, and the content of the second dispersant is between 0.1 wt% and 3 wt%. The photoinitiator is 1-hydroxycyclohexylbenzophenone, and the second dispersant is selected from at least one material group consisting of styrene-maleic anhydride copolymers and basic polymeric pigment dispersants.

2. The antistatic composite board as described in claim 1, wherein, The thickness of the PET substrate is between 1.5 mm and 2.5 mm, the thickness of the PET film is between 60 micrometers and 150 micrometers, and the thickness of the coating is between 2 micrometers and 8 micrometers.

3. The antistatic composite board as described in claim 1, wherein, The length of each of the carbon nanotubes is between 5 micrometers and 8 micrometers, and the diameter of each of the carbon nanotubes is between 1.2 nanometers and 2 nanometers.

4. The antistatic composite board as described in claim 1, wherein, The antistatic composite board includes two PET films and two coatings. The two PET films are disposed on both sides of the PET substrate, and each coating is disposed on the side of one of the PET films away from the PET substrate.

5. A method for manufacturing an antistatic composite board, comprising: A mixing step involves adding a polyurethane oligomer and an antistatic agent to a solvent and stirring at a speed between 600 rpm and 1,000 rpm for 5 to 15 minutes to obtain a coating solution; wherein the coating solution has a viscosity between 20 cps and 40 cps; wherein the antistatic agent comprises a first dispersant and a plurality of carbon nanotubes dispersed in the first dispersant, and the weight ratio of the carbon nanotubes to the first dispersant can be between 99:1 and 99.9:0.1; a coating step involves coating the coating solution onto a PET film to form a coating on one side of the PET film; a thermal bonding step involves bonding the PET film with the coating formed onto a PET substrate at a temperature between 40°C and 70°C to form an antistatic composite board; wherein the solvent is propylene glycol methyl ether acetate (PMA); wherein, based on a total weight of 100 wt% for the coating solution, the content of the polyurethane oligomer is between 30 wt% and 40 wt%. The content of the antistatic agent is between 5 wt% and 20 wt%, and the content of the solvent is between 40 wt% and 60 wt%; wherein the antistatic composite board has a light transmittance greater than or equal to 84%, a haze less than or equal to 4%, and a surface resistivity less than or equal to 107Ω.

6. A method for manufacturing an antistatic composite board as described in claim 5, wherein, In the mixing step, a photoinitiator and a second dispersant are also added; wherein, based on the total weight of the coating liquid being 100 wt%, the content of the photoinitiator is between 0.1 wt% and 2 wt%, and the content of the second dispersant is between 0.1 wt% and 3 wt%; wherein, the photoinitiator is 1-hydroxycyclohexylbenzophenone, and the second dispersant is selected from at least one of the materials group consisting of styrene-maleic anhydride copolymer and basic polymeric pigment dispersants.

7. A method for manufacturing an antistatic composite board as described in claim 6, wherein, After the coating step and before the thermal bonding step, the method for manufacturing the antistatic composite board further includes a photocuring step, in which the PET film with the coating is photocured at a light intensity between 500 mJ / cm2 and 1000 mJ / cm2.

8. A method for manufacturing an antistatic composite board as described in claim 5, wherein, The length of each of the carbon nanotubes is between 5 micrometers and 8 micrometers, and the diameter of each of the carbon nanotubes is between 1.2 nanometers and 2 nanometers.

9. A method for manufacturing an antistatic composite board as described in claim 5, wherein, The thickness of the PET substrate is between 1.5 mm and 2.5 mm, the thickness of the PET film is between 60 micrometers and 150 micrometers, and the thickness of the coating is between 2 micrometers and 8 micrometers.

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