Beliann super black nano composite coating and its application in contrast enhancement of LED display screen

Abstract

The application relates to the technical field of display screen coating, in particular to a Belyan super-black nanometer composite coating and contrast enhancement application of the Belyan super-black nanometer composite coating in an LED display screen. A Belyan super-black nanometer composite material comprises the following components in parts by weight: 200 parts of carbon nanotubes, 100-200 parts of graphene, 40-80 parts of an antistatic material, 20-40 parts of manganese-iron black, 400-600 parts of a resin and 3000-4000 parts of ethyl acetate; the antistatic material comprises at least one of titanium suboxide and chromium dioxide; and the resin comprises at least one of an epoxy resin, a polyurethane resin and an acrylic resin. According to the application, the manganese-iron black is used to enhance the corrosion resistance of the coating and reduce the generation of pits on the surface of the coating; and the antistatic material is added to improve a three-dimensional conductive network composed of the carbon nanotubes and the graphene, reduce the degree of charge aggregation and reduce the adsorption probability of dust.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display screen coating, in particular to a Belyan super black nanocomposite coating and its application in contrast enhancement of LED display screens. BACKGROUND

[0002] The Belyan super black nanocomposite coating is a new type of material capable of efficiently absorbing incident light. The super black property of the coating is derived from the nanoscale structure design (such as carbon nanotube array or porous honeycomb structure), which can realize multiple scattering and absorption of incident light, and has extremely high light absorption rate. It has wide application prospects in scientific research and engineering application fields. The Belyan super black nanocomposite coating also has applications in LED display screens.

[0003] However, the components of the Belyan super black nanocomposite coating vary, and some Belyan super black nanocomposite coatings have poor corrosion resistance, which causes many pits on the surface of the coating after long-term use. These pits provide a foothold for dust in the environment, which in turn affects the image display effect of various display screens. For example, LED display screens have high resolution and fine picture quality, and dust on the surface will seriously affect their use. SUMMARY

[0004] To solve the problem of poor corrosion resistance of some Belyan super black nanocomposite coatings, which causes dust to fall on the surface of the display screen, the present application provides a Belyan super black nanocomposite material. On the one hand, the present application enhances the corrosion resistance of the coating by using manganese-iron black to reduce the generation of pits on the surface of the coating. On the other hand, the present application improves the three-dimensional conductive network composed of carbon nanotubes and graphene by adding an antistatic material to reduce the degree of charge accumulation and the probability of dust adsorption.

[0005] In a first aspect, the present application provides a Belyan super black nanocomposite material, which adopts the following technical solution:

[0006] A Belyan super black nanocomposite material, comprising the following components by weight:

[0007] Carbon nanotubes 200 parts, graphene 100-200 parts, antistatic material 40-80 parts, manganese-iron black 20-40 parts, resin 400-600 parts, ethyl acetate 3000-4000 parts;

[0008] The antistatic material includes at least one of titanium suboxide and chromium dioxide;

[0009] The resin includes at least one of epoxy resin, polyurethane resin, and acrylic resin.

[0010] By adopting the technical scheme, the manganese-iron black is composed of iron-manganese oxide (Fe-Mn-O), the crystal structure of which remains stable in high temperature (heat resistance up to 600℃ or above) and acid-alkali environment, effectively preventing the penetration and reaction of corrosion medium. As an inorganic pigment, the manganese-iron black has fine particle size and uniform dispersion, can fill the micropores in the coating, and reduce the penetration rate of water, oxygen and corrosive ions (Cl - , SO4 2- ). The addition of the manganese-iron black improves the corrosion resistance of the coating, thereby reducing the pits caused by environmental corrosion and reducing the probability of dust falling.

[0011] In the antistatic material, the titanium suboxide can form a continuous conductive network in the coating, accelerate charge migration, and avoid static accumulation. The uniform dispersion of titanium suboxide particles enhances the electron transport efficiency inside the coating, especially in the thermal spraying process, which is closely combined with the resin matrix to form a low-resistance path, significantly reducing the surface resistivity. Chromium dioxide itself has certain semiconductor properties, and defects and doping in its crystal structure can form carrier channels to promote electron migration. The dispersed chromium dioxide particles in the coating form conductive paths by mutual contact, reducing the overall resistance of the coating, thereby accelerating the dissipation of static charges. The three-dimensional conductive network can be formed between carbon nanotubes and graphene, and the addition of the antistatic material can further improve the conductive performance and reduce the degree of charge accumulation on the surface of the coating, thereby reducing the probability of dust adsorption.

[0012] In one aspect, the manganese-iron black is used to enhance the corrosion resistance of the coating and reduce the generation of pits on the surface of the coating. On the other hand, the addition of the antistatic material improves the three-dimensional conductive network composed of carbon nanotubes and graphene, reduces the degree of charge accumulation, and reduces the probability of dust adsorption.

[0013] Preferably, the antistatic material is titanium suboxide.

[0014] By adopting the technical scheme, the titanium suboxide not only improves the conductive performance of the coating, but also remains chemically inert in strong acid, strong alkali and corrosive medium containing fluoride ions, avoiding the erosion of the coating itself. Therefore, the titanium suboxide particles can fill the micropores of the coating and reduce the penetration path of corrosive medium (such as Cl - , H2O).

[0015] Preferably, the antistatic material is a mixture of titanium suboxide and chromium dioxide.

[0016] By adopting the technical scheme, the chromium dioxide surface can have oxygen vacancies or specific charge distribution, which can interact with the carbon nanotubes / graphene through electrostatic adsorption or van der Waals force, affect the arrangement direction, and thus improve the overall conductive network. After the carbon nanotubes / graphene are arranged in a direction, the high conductivity of the titanium suboxide makes the conductive network have high electron mobility and low interface resistance.

[0017] In addition, the chromium dioxide is a ferromagnetic material, and can be induced by an external magnetic field to make the carbon nanotubes or graphene arranged in a better direction. Therefore, the titanium suboxide and the chromium dioxide have good synergistic effect, which can further improve the conductive network and improve the anti-static ability of the coating.

[0018] Preferably, the mass ratio of the titanium suboxide and the chromium dioxide in the mixture is 10:3-5.

[0019] By adopting the technical scheme, when the content of the chromium dioxide is too low, the synergistic effect of the titanium suboxide and the chromium dioxide is not good, and the anti-static performance is limitedly improved; when the content of the chromium dioxide is too high, the proportion of the titanium suboxide is low, which also reduces the synergistic effect of the two and the corrosion resistance of the coating; therefore, the applicant finally determines that the mass ratio of the titanium suboxide and the chromium dioxide in the present application is appropriate.

[0020] Preferably, the resin is an epoxy resin.

[0021] By adopting the technical scheme, among the three resins, the manganese black, the titanium suboxide and the chromium dioxide have stronger bonding force with the epoxy resin, and relatively, the coating has higher corrosion resistance and anti-static performance.

[0022] In a second aspect, the present application provides a preparation method of the Beilian super-black nanocomposite, which adopts the following technical scheme:

[0023] The preparation method of the Beilian super-black nanocomposite is used for preparing the above-mentioned Beilian super-black nanocomposite, and includes the following steps:

[0024] Step one: mix the formula amount of carbon nanotubes and graphene to obtain a mixture A;

[0025] Step two: mix the mixture A, the anti-static material, the manganese black and the resin, then mix the ethyl acetate, and then uniformly stir to obtain the Beilian super-black nanocomposite.

[0026] In a third aspect, the present application provides an application of the Beilian super-black nanocomposite, which adopts the following technical scheme:

[0027] The application of a Beili'an super black nanocomposite material includes the following steps: spraying the Beili'an super black nanocomposite material to the surface of a substrate, and after curing, a Beili'an super black nanocomposite coating is obtained.

[0028] Preferably, when the antistatic material in the Beili'an super black nanocomposite material includes chromium dioxide, the Beili'an super black nanocomposite material is sprayed to the surface of a substrate under a magnetic field, and after curing, a Beili'an super black nanocomposite coating is obtained.

[0029] By using the above technical solution, chromium dioxide is a ferromagnetic substance, and the orientation arrangement of carbon nanotubes or graphene can be better induced by an external magnetic field, which can further improve the conductive network and improve the antistatic ability of the coating.

[0030] In summary, the present application has the following beneficial effects:

[0031] 1. On the one hand, the present application enhances the corrosion resistance of the coating by using manganese iron black, thereby reducing the generation of pits on the surface of the coating; on the other hand, the three-dimensional conductive network composed of carbon nanotubes and graphene is improved by adding an antistatic material, thereby reducing the degree of charge accumulation and the probability of dust adsorption.

[0032] 2. The antistatic material of the present application is a mixture of titanium suboxide and chromium dioxide, which can exert the synergistic effect of titanium suboxide and chromium dioxide, thereby further improving the antistatic ability of the coating; in particular, the orientation arrangement of carbon nanotubes or graphene can be better induced by an external magnetic field when the coating is applied. DETAILED DESCRIPTION

[0033] The raw materials in the present application include the following parts:

[0034] Chromium dioxide: commercially available product with CAS number 12018-01-8;

[0035] Titanium suboxide: commercially available product with CAS number 12065-65-5;

[0036] Manganese iron black: commercially available product with CAS number 68186-94-7;

[0037] The present application is further described in detail below in combination with examples and comparative examples.

[0038] Example 1

[0039] A preparation method of a Beili'an super black nanocomposite material includes the following steps:

[0040] Step one: mix 200g of carbon nanotubes and 200g of graphene to obtain a mixture A;

[0041] Step two: mix mixture A, 80 g titanium suboxide, 40 g manganese iron black into 600 g epoxy resin, then add 4000 g ethyl acetate, mix and ultrasonic stir to obtain the Belyan super black nanocomposite.

[0042] An application of a Belyan super black nanocomposite, comprising the following steps: spraying the Belyan super black nanocomposite to the surface of glass at an angle of 75° (70-80° are also available), adopting a ladder curing process, specifically 2 h at 80°C, then 1 h at 120°C, and finally 12 h at 60°C to obtain the Belyan super black nanocomposite coating.

[0043] The base material can be a display screen such as an LED display screen, a metal material, etc. in addition to glass. The present application is only exemplified by glass.

[0044] Example 2-3

[0045] Example 2-3 adjusts the content of each component of the Belyan super black nanocomposite on the basis of the preparation method of Example 1, and the specific adjustment is shown in Table 1.

[0046] Comparative Example 1-2

[0047] Comparative Example 1 does not add manganese iron black on the basis of the preparation method of Example 1.

[0048] Comparative Example 2 does not add titanium suboxide on the basis of the preparation method of Example 1.

[0049] The Belyan super black nanocomposite coating of Example 1-3 and Comparative Example 1-2 is subjected to the following performance detection test.

[0050] Performance detection test

[0051] 1. Corrosion resistance

[0052] According to GB / T 17897 2016, the corrosion rate is determined.

[0053] 2. Anti-static performance

[0054] First, place the Belyan super black nanocomposite coating in a 35°C salt spray environment for 12 h, and the salt spray concentration is 5% sodium chloride solution. Then place it in a room temperature environment for 5 days, and count the number of dust points per square centimeter on the Belyan super black nanocomposite coating.

[0055] Table 1: Component content (unit: g) and performance detection table of Example 1-3 and Comparative Example 1-2

[0056]

[0057] From Table 1, it can be seen that, in the case of the Belian super-black nanometer composite coating not containing manganese black, the corrosion resistance of the coating is reduced. This is probably because manganese black, as an inorganic pigment, has a small particle size and is uniformly dispersed, and can fill the micropores in the coating, thereby reducing the penetration rate of water, oxygen and corrosive ions (Cl - , SO4 2- ). The addition of manganese black improves the corrosion resistance of the coating, thereby reducing the pits caused by environmental corrosion, and also reducing the number of dust points.

[0058] If the Belian super-black nanometer composite coating does not contain titanium suboxide, the corrosion resistance of the coating will decrease to some extent, and the decline in anti-static performance will be greater. The reason is probably that titanium suboxide can form a continuous conductive network in the coating, accelerate charge migration, and avoid static accumulation. Titanium suboxide not only improves the conductivity of the coating, but also has stable crystal structure and remains chemically inert in strong acid, strong base and fluoride ion-containing corrosive media, thereby avoiding corrosion of the coating itself. Therefore, titanium suboxide particles can fill the micropores in the coating and reduce the penetration path of corrosive media (such as Cl - , H2O).

[0059] In addition, it is found from Comparative Examples 1-3 that the comprehensive performance of Example 1 is the best, and therefore, Example 1 is preferred.

[0060] Examples 4-7

[0061] Example 4 is prepared based on the preparation method of Example 1, and 80 g of titanium suboxide is replaced by 80 g of chromium dioxide.

[0062] Example 5 is prepared based on the preparation method of Example 1, and 80 g of titanium suboxide is replaced by 80 g of a mixture of titanium suboxide and chromium dioxide, and the mass ratio of titanium suboxide to chromium dioxide in the mixture is 10:4.

[0063] Examples 6-7 are prepared based on the preparation method of Example 5, and the mass ratio of titanium suboxide to chromium dioxide is adjusted, and the specific adjustment is shown in Table 2.

[0064] The Belian super-black nanometer composite coatings of Examples 4-7 are subjected to the above performance tests, and the test results are shown in Table 2.

[0065] Table 2: Anti-static material types and mass ratios of titanium suboxide and chromium dioxide of Examples 1 and 4-7, and performance test data

[0066]

[0067] As shown in Table 2, it can be seen from Comparative Example 1 and Examples 4-7 that the corrosion resistance of chromium dioxide is not as good as that of titanium suboxide, but the surface of chromium dioxide can have oxygen vacancies or specific charge distribution, which can interact with carbon nanotubes / graphene through electrostatic adsorption or van der Waals force, affect the arrangement direction, and thus improve the overall conductive network, so that the antistatic performance of the coating containing chromium dioxide is stronger.

[0068] When chromium dioxide and titanium suboxide are compounded, chromium dioxide promotes the directional arrangement of carbon nanotubes / graphene, and the high conductivity of titanium suboxide makes the conductive network have high electron mobility and low interface resistance.

[0069] As the proportion of chromium dioxide in the mixture gradually increases, the antistatic performance of the coating shows a trend of first increasing and then decreasing, because as the proportion of chromium dioxide in the mixture gradually increases, the synergistic effect of titanium suboxide and chromium dioxide gradually increases, thereby gradually improving the antistatic performance of the coating. When it exceeds a certain range, the proportion of titanium suboxide is low, which will also reduce the synergistic effect of the two and the corrosion resistance of the coating.

[0070] Examples 8-9

[0071] Examples 8-9 are based on the preparation method of Example 1, and the types of resins are adjusted, as shown in Table 3.

[0072] The performance of the Belyan Super Black nano composite coating of Examples 8-9 is detected as above, and the test results are shown in Table 3.

[0073] Table 3 Resin types and performance test data of Example 1 and Examples 8-9

[0074]

[0075] As shown in Table 3, it can be seen from Comparative Example 1 and Examples 8-9 that among the three resins, the coating prepared by the epoxy resin has higher corrosion resistance and antistatic performance. It can be due to the stronger bonding force between manganese black, titanium suboxide, chromium dioxide and epoxy resin.

[0076] Examples 10-12

[0077] Example 10 is modified from the application of Example 1, that is, under the condition of a magnetic field strength of 1.5T (0.5T-1.5T can be used), the Belyan Super Black nano composite material is sprayed onto the surface of the glass at an angle of 75° (70-80° can be used), and a ladder curing process is used, that is, 80°C for 2h, then 120°C for 1h, and finally 60°C for 12h, to obtain the Belyan Super Black nano composite coating.

[0078] Example 11 Based on the preparation method of Example 10, 80 g of titanium suboxide is replaced by 80 g of chromium dioxide.

[0079] Example 12 Based on the preparation method of Example 10, 80 g of titanium suboxide is replaced by a mixture of 80 g of titanium suboxide and chromium dioxide, and the mass ratio of titanium suboxide to chromium dioxide in the mixture is 10:4.

[0080] The performance of the Belian super-black nano composite coating of Examples 10-12 is detected as above, and the test results are shown in Table 4.

[0081] Table 4 Anti-static material type of Examples 1 and 10-12 and data table of performance detection under spraying with or without magnetic field

[0082]

[0083] As shown in Table 4, it can be seen from Comparative Example 1 and Examples 10-12 that titanium suboxide is not a magnetic material, and the magnetic field has little effect on titanium suboxide. Chromium dioxide is a magnetic material, and the external magnetic field induces chromium dioxide, so that the directional arrangement of carbon nanotubes or graphene is better, and a better conductive network is obtained, thereby improving the anti-static performance of the coating.

[0084] When titanium suboxide and chromium dioxide are compounded, and an external magnetic field is applied, the synergistic effect of the two can be further promoted, and the conductive performance is further improved, thereby improving the anti-static performance of the coating.

[0085] Application Example

[0086] The application example can use the Belian super-black nano composite coating of any one of Examples 1-12.

[0087] Application Example 1

[0088] An application of a Belian super-black nano composite material includes the following steps: spraying the Belian super-black nano composite material of Example 1 to the surface of an LED display screen, and using a step curing process, specifically 2 h at 80°C, then 1 h at 120°C, and finally 12 h at 60°C to obtain a Belian super-black nano composite coating.

[0089] An LED display screen with a Belian super-black nano composite coating has optical performance of light transmittance ≥ 99.3% in the 380-780 nm wavelength band and black field reflectivity ≤ 0.6%, and has protective performance of pencil hardness ≥ 3H (ASTM D3363 standard test), and has impact resistance performance of impact resistance energy ≥ 90 in·lb (ASTM D2794 standard test).

[0090] The LED display screen without the Beili'an super black nanometer composite coating and the LED display screen with the Beili'an super black nanometer composite coating are tested by the VESA standard, and it is found that the display screen contrast of the LED display screen without the Beili'an super black nanometer composite coating is 1500:1, and the display screen contrast of the LED display screen with the Beili'an super black nanometer composite coating is 5000:1. The reason why the display screen contrast of the LED display screen with the Beili'an super black nanometer composite coating is increased is that the surface roughness Ra of the coating is less than or equal to 0.05 microns, the black field depth is enhanced by reducing the diffuse reflection, and the three-dimensional network structure of the carbon nanotube / graphene can reduce light scattering.

[0091] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution according to the needs after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A Beilby's Black ultra-black nanocomposite material, characterized in that, The composition comprises the following components by weight: Carbon nanotubes 200 parts, graphene 100-200 parts, anti-static material 40-80 parts, manganese iron black 20-40 parts, resin 400-600 parts, ethyl acetate 3000-4000 parts; The anti-static material is a mixture of titanium suboxide and chromium dioxide; the mass ratio of titanium suboxide to chromium dioxide in the mixture is 10:3-5; The resin comprises at least one of epoxy resin, polyurethane resin and acrylic resin.

2. The Belian Super Black nanocomposite material according to claim 1, characterized in that: The resin is epoxy resin.

3. The method of producing the Beligan Super Black nanocomposite material as claimed in any one of claims 1-2, characterized in that, The method comprises the following steps: Step one: mix the formula amount of carbon nanotubes and graphene to obtain a mixture A; Step two: mix the mixture A, anti-static material, manganese iron black into the resin, then add ethyl acetate, mix, and then uniformly stir under ultrasonic to obtain the Beilian super-black nanocomposite material.

4. Use of the Beligan Super Black nanocomposite material as described in any one of claims 1 to 2, characterized in that, The method comprises the following steps: spray the Beilian super-black nanocomposite material onto the surface of a substrate, and the Beilian super-black nanocomposite coating is obtained after solidification.

5. Use of the Beligan Super Black nanocomposite material according to claim 4, characterized in that, The method comprises the following steps: Spray the Beilian super-black nanocomposite material onto the surface of a substrate under the condition of a magnetic field, and the Beilian super-black nanocomposite coating is obtained after solidification.

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