Environment-friendly carbon nanotube antistatic agent, coating and composite material

Abstract

The invention discloses an environment-friendly carbon nanotube antistatic agent, a coating and a composite material, and the antistatic agent comprises the following components in parts by weight: 0.5-2 parts of an antistatic auxiliary agent, the antistatic auxiliary agent takes a multi-walled carbon nanotube as a main body, and the main body is modified with conductive nanoparticles; 4-8 parts of water-based resin; 0.5 to 0.8 part of a dispersant; and 100 parts of water. By optimizing the composition of the product, the coating performance and the conductivity of the product are improved, no VOC (volatile organic compound) is discharged in the production and application process, and the environment friendliness is high.

Description

Technical Field

[0001] The present invention relates to electronic material technology, in particular to an environmentally friendly carbon nanotube antistatic agent, coating and composite material. Background Art

[0002] Most of the antistatic agents used for antistatic film surfaces on the market are oily antistatic agents. Such antistatic agents are prone to produce volatile organic matter during the preparation process, which is harmful to the preparation personnel and the environment. Other solvents need to be added for coating and spraying during use, which is inconvenient to use, complicated to process and prepare, and easily causes pollution.

[0003] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly carbon nanotube antistatic agent, coating and composite material, which improves the coating performance and electrical conductivity of the product by optimizing the composition of the product, and has no VOC emissions during the production and application process, and is highly environmentally friendly.

[0005] To achieve the above-mentioned purpose, an embodiment of the present invention provides an environmentally friendly carbon nanotube antistatic agent, which comprises, by weight: 0.5 to 2 parts of an antistatic auxiliary agent, the antistatic auxiliary agent is mainly composed of multi-walled carbon nanotubes, and the main body is modified with conductive nanoparticles; 4 to 8 parts of an aqueous resin; 0.5 to 0.8 parts of a dispersant; and 100 parts of water.

[0006] In one or more embodiments of the present invention, the specific surface area of ​​the carbon nanotubes is 200-300 m 2 / g(BETSSA).

[0007] In one or more embodiments of the present invention, the multi-walled carbon nanotubes have a diameter of 6-13 nm and a length of 2.5-6 μm.

[0008] In one or more embodiments of the present invention, the conductive nanoparticles are metal nanoparticles.

[0009] In one or more embodiments of the present invention, the size of the metal nanoparticles is 10-30 nm.

[0010] In one or more embodiments of the present invention, the metal element of the metal nanoparticles is selected from silver, copper and aluminum.

[0011] Preferably, the antistatic auxiliary agent is prepared by adding 2-3 drops of sodium potassium tartrate solution and 5-8 drops of cuprous oxide dispersion to each milliliter of double distilled water, wherein the cuprous oxide dispersion is a distilled water dispersion in which 0.2-0.5 mg / mL of cuprous oxide nanoparticles are dispersed under anaerobic conditions, and the concentration of the sodium potassium tartrate solution is 10-35 mg / mL; then 10 drops of a mixed dispersion containing multi-walled carbon nanotubes (wherein the mixed dispersion is a multi-walled carbon nanotube dispersed in double distilled water with a concentration of 0.05-0.3 g / mL) are added, and after shaking, 8-10 drops of silver ammonia solution are added, and the solution is light brown, and then 1-2 drops of concentrated ammonia water are added, and the solution becomes colorless after shaking, and the solution is kept still in a water bath at 50-70° C. for 10-30 seconds, and the carbon nanotubes are quickly filtered to separate and dried.

[0012] In one or more embodiments of the present invention, the water-based resin is selected from polyvinyl alcohol having a number average molecular weight of 110,000 to 160,000.

[0013] In one or more embodiments of the present invention, the dispersant is an alcoholamine dispersant, preferably an acrylic alcoholamine salt dispersant such as W193-113.

[0014] In one or more embodiments of the present invention, the coating is a layer structure of at least one layer or multiple layers formed by the antistatic agent as described above, such as an antistatic coating of an antistatic film on the surface of a liquid crystal display.

[0015] In one or more embodiments of the present invention, the coating slurry can be prepared by rapidly dispersing a dispersant, an aqueous resin, an antistatic agent, and deionized water in a high-speed mixer at a speed of 400 to 600 rpm for 3 to 5 minutes.

[0016] In one or more embodiments of the present invention, the composite material includes a main body and the aforementioned coating formed on the surface of the main body, such as an antistatic film on the surface of a liquid crystal display.

[0017] Compared with the prior art, the environmentally friendly carbon nanotube antistatic agent, coating and composite material according to the embodiments of the present invention can be applied to the surface of PET, PVC and plastic products by roller coating, spraying, printing and other methods, without the need for additional solvent dilution, and can have a good antistatic effect. It mostly uses environmentally friendly water-based ingredients and does not affect the original transparency of the film. The preparation process has zero VOC emissions, is environmentally friendly, and is health-friendly to operators. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is described in detail below in conjunction with the specific embodiments of the present invention. However, it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0019] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0020] Example 1

[0021] The environmentally friendly carbon nanotube antistatic agent of this embodiment comprises, by weight: 0.5 parts of antistatic agent, the antistatic agent having a specific surface area of ​​200m 2 / g, multi-walled carbon nanotubes with a diameter of 6nm and a length of 2.5μm are the main body, and the main body is modified with 10nm silver conductive nanoparticles; 4 parts of polyvinyl alcohol with a number average molecular weight of 110,000; 0.5 parts of dispersant; 100 parts of water.

[0022] Before coating, the antistatic agent can be the aforementioned dispersant, water-based resin, antistatic auxiliary agent, and deionized water, which are quickly dispersed into a slurry in a high-speed mixer at a speed of 500 rpm for 4 minutes, so that a protective film can be obtained after coating. These protective films can be used in occasions such as displays that require electrostatic protection.

[0023] Example 2

[0024] The only difference between this embodiment and embodiment 1 is that the main body-modified nanoparticles are copper conductive nanoparticles.

[0025] Example 3

[0026] The difference between this embodiment and embodiment 1 is only that:

[0027] The antistatic auxiliary agent is prepared by adding 2 drops of sodium potassium tartrate solution and 5 drops of cuprous oxide dispersion to each milliliter of double distilled water, wherein the cuprous oxide dispersion is a distilled water dispersion in which 0.2 mg / mL of cuprous oxide nanoparticles are dispersed under anaerobic conditions, and the concentration of the sodium potassium tartrate solution is 10 mg / mL; then 10 drops of a mixed dispersion containing multi-walled carbon nanotubes (wherein the mixed dispersion is a multi-walled carbon nanotube dispersed in double distilled water with a concentration of 0.05 g / mL) are added, and after shaking, 8 drops of silver ammonia solution are added, and the solution is light brown, and then 2 drops of concentrated ammonia water are added, and the solution becomes colorless after shaking, and the solution is kept still in a 50°C water bath for 10 seconds, and the carbon nanotubes are quickly filtered to separate and dried.

[0028] Example 4

[0029] The difference between this embodiment and embodiment 1 is only that:

[0030] The antistatic auxiliary agent is prepared by adding 3 drops of sodium potassium tartrate solution and 7 drops of cuprous oxide dispersion to each milliliter of double distilled water, wherein the cuprous oxide dispersion is a distilled water dispersion in which 0.35 mg / mL of cuprous oxide nanoparticles are dispersed under anaerobic conditions, and the concentration of the sodium potassium tartrate solution is 24 mg / mL; then 10 drops of a mixed dispersion containing multi-walled carbon nanotubes (wherein the mixed dispersion is a multi-walled carbon nanotube dispersed in double distilled water with a concentration of 0.2 g / mL) are added, and after shaking, 8 drops of silver ammonia solution are added, and the solution is light brown, and then 2 drops of concentrated ammonia water are added, and the solution becomes colorless after shaking, and the solution is kept still in a 50°C water bath for 10 seconds, and the carbon nanotubes are quickly filtered to separate and dried.

[0031] Example 5

[0032] The difference between this embodiment and embodiment 1 is only that:

[0033] The antistatic auxiliary agent is prepared by adding 2 drops of sodium potassium tartrate solution and 8 drops of cuprous oxide dispersion to each milliliter of double distilled water, wherein the cuprous oxide dispersion is a distilled water dispersion in which 0.5 mg / mL of cuprous oxide nanoparticles are dispersed under anaerobic conditions, and the concentration of the sodium potassium tartrate solution is 35 mg / mL; then 10 drops of a mixed dispersion containing multi-walled carbon nanotubes (wherein the mixed dispersion is a multi-walled carbon nanotube dispersed in double distilled water with a concentration of 0.3 g / mL) are added, and after shaking, 8 drops of silver ammonia solution are added, and the solution is light brown, and then 2 drops of concentrated ammonia water are added, and the solution becomes colorless after shaking, and the solution is kept still in a 50°C water bath for 10 seconds, and the carbon nanotubes are quickly filtered to separate and dried.

[0034] Example 6

[0035] The difference between this embodiment and embodiment 4 is that the solution becomes colorless after shaking, is kept in a 60° C. water bath for 10 seconds, and the carbon nanotubes are separated by rapid filtration and dried.

[0036] Example 7

[0037] The difference between this embodiment and embodiment 4 is that the solution becomes colorless after shaking, is kept in a 70° C. water bath for 30 seconds, and the carbon nanotubes are separated by rapid filtration and dried.

[0038] Example 8

[0039] The difference between this embodiment and embodiment 7 is that the antistatic agent comprises, by weight: 1 part of antistatic agent, the antistatic agent having a specific surface area of ​​250m 2 / g, multi-walled carbon nanotubes with a diameter of 9nm and a length of 4μm are the main body, and the main body is modified with 20nm conductive nanoparticles; 6 parts of polyvinyl alcohol with a number average molecular weight of 130,000; 0.7 parts of dispersant; 100 parts of water.

[0040] Example 9

[0041] The difference between this embodiment and embodiment 7 is that the antistatic agent comprises, by weight: 2 parts of antistatic agent, the antistatic agent having a specific surface area of ​​300m 2 / g, multi-walled carbon nanotubes with a diameter of 13nm and a length of 6μm are the main body, and the main body is modified with 30nm conductive nanoparticles; 8 parts of polyvinyl alcohol with a number average molecular weight of 160,000; 0.8 parts of dispersant; 100 parts of water.

[0042] Comparative Example 1

[0043] The difference between this comparative example and Example 4 is that the solution becomes colorless after shaking, is kept in a water bath at 80° C. for 10 seconds, and the carbon nanotubes are separated by rapid filtration and dried.

[0044] Comparative Example 2

[0045] The only difference between this comparative example and Example 4 is that no cuprous oxide dispersion is added.

[0046]

[0047]

[0048] The good stability in the above table does not only refer to the good uniformity of the dispersion of the components in the coating, but also has good thermal shock stability (tested at ±20℃ thermal shock cycle for 20 times, the antistatic coating has no obvious deformation, warping, peeling and other defects) and high temperature and anti-aging stability (tested at 50℃ and 85% humidity for 3000h, the antistatic coating has no obvious deformation, embrittlement, peeling and other defects).

[0049] Including but not limited to the antistatic agent of the above embodiment, when coating, the coating slurry can be a dispersant, an aqueous resin, an antistatic auxiliary agent, and deionized water, which are quickly dispersed in a high-speed mixer at a speed of 400 to 600 rpm for 3 to 5 minutes. The specific mixing process can be determined according to the needs. No specific limitation is made here, and only some feasible examples are given.

[0050] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. An environmentally friendly carbon nanotube antistatic agent, comprising, by weight: 0.5 to 2 parts of an antistatic agent, wherein the antistatic agent is mainly composed of multi-walled carbon nanotubes, and the main body is modified with conductive nanoparticles; 4-8 parts of water-based resin; 0.5-0.8 parts of dispersant; 100 parts water.

2. The environmentally friendly carbon nanotube antistatic agent according to claim 1, characterized in that: The specific surface area of ​​the carbon nanotubes is 200-300 m 2 / g.

3. The environmentally friendly carbon nanotube antistatic agent according to claim 2, characterized in that: The multi-walled carbon nanotubes have a diameter of 6-13 nm and a length of 2.5-6 μm.

4. The environmentally friendly carbon nanotube antistatic agent according to claim 1, characterized in that: The conductive nanoparticles are metal nanoparticles.

5. The environmentally friendly carbon nanotube antistatic agent according to claim 4, characterized in that: The size of the metal nanoparticles is 10-30 nm.

6. The environmentally friendly carbon nanotube antistatic agent according to claim 1, 4 or 5, characterized in that: The metal element of the metal nanoparticles is selected from silver and copper.

7. The environmentally friendly carbon nanotube antistatic agent according to claim 1, characterized in that: The water-based resin is selected from polyvinyl alcohol having a number average molecular weight of 110,000 to 160,000.

8. The environmentally friendly carbon nanotube antistatic agent according to claim 1, characterized in that: The dispersant is an alcoholamine dispersant.

9. A coating, a layer structure of one or more layers formed by at least the antistatic agent according to any one of claims 1 to 8.

10. A composite material comprising a main body and the coating according to claim 9 formed on the surface of the main body.

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