Water-based matte black light-absorbing glue as well as preparation method and application thereof

Abstract

The invention provides the water-based matte black light-absorbing glue as well as the preparation method and the application thereof, and the water-based matte black light-absorbing glue is low in VOC emission and environment-friendly. And the matte extra-black glue is dispensed on the glass substrate of the Mini / Micro LED display screen, the PCB substrate and the silicon-based backboard gap in a dispensing mode through dispensing machine equipment. The water-based matt black light-absorbing glue can shield the original color and luster on the substrate and the unclearness caused by the fact that the Mini / Micro LED is inevitably influenced by the luster when a light source is put, so that the visible light is absorbed.

Description

Technical Field

[0001] This invention relates to the field of light-absorbing adhesives, and in particular to a water-based matte black light-absorbing adhesive, its preparation method, and its application. Background Technology

[0002] With the advancement of technology, people have increasingly higher requirements for the color image quality and clarity of LED displays. Current technology usually involves adjusting the contrast ratio of the display. Generally speaking, the higher the contrast ratio, the clearer and more striking the image, the more vivid and vibrant the colors, and the better the display effect. On the other hand, a low contrast ratio will make the entire picture appear hazy, affecting the display effect. Currently, the industry's method to improve contrast ratio is to increase the brightness of the white screen of the LED display. However, infinitely increasing the brightness will bring risks such as increased LED display temperature, increased power consumption, and reduced lifespan.

[0003] With increasing environmental awareness and improved environmental regulations, the emission of volatile organic compounds (VOCs) is subject to increasingly stringent restrictions. Therefore, there is an urgent need for an environmentally friendly LED display screen that can solve the problem of blurry and unclear projection caused by data non-concentration after projection. Summary of the Invention

[0004] The present invention aims to at least partially overcome the above-mentioned defects and at least partially solve one of the above-mentioned technical problems, such as the lack of blurry projection and environmental friendliness of environmentally friendly light-absorbing LED displays.

[0005] To solve the technical problem, the present invention provides a water-based matte black light-absorbing adhesive, comprising: water-based acrylic acid ester, water-based polyurethane resin, carbon black, and modified nano-carbon, wherein the water-based acrylic acid ester comprises 10-20 parts by weight, the water-based polyurethane resin comprises 30-50 parts by weight, the carbon black comprises 3-5 parts by weight, and the modified nano-carbon comprises 2-5 parts by weight.

[0006] Optionally, it may also include: pure water, cosolvent, wetting agent, dispersant, leveling agent, and silica.

[0007] Optionally, the weight parts of each component are as follows: pure water: 20-30 parts by weight; cosolvent: 5-10 parts by weight; wetting agent: 0.2-1 parts by weight; dispersant: 1-2 parts by weight; leveling agent: 0.1-0.3 parts by weight; and silica: 3-8 parts by weight.

[0008] Optionally, it also includes: 15-18 parts by weight of waterborne acrylic acid ester, 35-45 parts by weight of waterborne polyurethane resin, 4 parts by weight of carbon black, and 3-4 parts by weight of modified nano-carbon.

[0009] To solve the technical problem, a second aspect of the present invention provides a method for manufacturing the water-based matte black light-absorbing adhesive of any of the preceding claims, comprising: dispersing water-based acrylic resin, water-based polyurethane resin, pure water, co-solvent, wetting agent, dispersant, leveling agent, and continuously stirring for 20-30 minutes to obtain an initial coating; adding carbon black, modified nano carbon, and silicon dioxide to the initial coating and continuously stirring for 1-2 hours to mix evenly to obtain the water-based matte black light-absorbing adhesive.

[0010] To solve the technical problem, a third aspect of the present invention provides a method for applying a water-based matte black light-absorbing adhesive according to any one of the preceding claims, comprising: adding a curing agent and pure water to the water-based matte black light-absorbing adhesive to obtain a mixed adhesive; placing the mixed adhesive into a dispensing device, controlling the pressure in the spray gun to apply the mixed adhesive to the object to be dispensed in a dispensing manner to obtain a coating film.

[0011] Optionally, the water-based matte black light-absorbing adhesive, curing agent, and pure water in the mixed adhesive are in a weight ratio of 100:3~8:5~20.

[0012] Optionally, it also includes: a pressure of 0.5–3 kg / cm² in the spray gun. 2 Drying temperature 60~80 degrees Celsius, drying time 30~90 minutes.

[0013] Optionally, the coating thickness is 10~90μm.

[0014] In summary, the water-based matte black light-absorbing adhesive of the present invention is a novel adhesive for Mini / Micro LED displays. The water-based matte black light-absorbing adhesive coating obtained on the surface of the gap in the middle of the Mini / Micro LED display can greatly absorb external light sources, thereby reducing the visual color difference when the human eye views the Mini / Micro LED display, making the visual colors more concentrated, vivid, and the images clearer, thus improving the display effect.

[0015] The reflectance of the light source was measured in the visible light spectrum at wavelengths of 400nm to 780nm. The reflectance absorption was ≤1.5% to 3%, and the gloss was ≤0.1 degrees when measured with a 60-degree angle photometer.

[0016] Furthermore, water-based coatings use water as a solvent, saving a significant amount of resources, eliminating the risk of fire during construction, reducing air pollution, improving working environment conditions, and contributing to pollution reduction, resource conservation, low VOC emissions, and high environmental friendliness. Detailed Implementation

[0017] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present invention by illustrating examples of the invention.

[0018] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0019] In one embodiment of the water-based matte black light-absorbing adhesive of the present invention, it comprises: water-based acrylic acid ester, water-based polyurethane resin, carbon black, and modified nano-carbon, wherein the water-based acrylic acid ester comprises 10-20 parts by weight, the water-based polyurethane resin comprises 30-50 parts by weight, the carbon black comprises 3-5 parts by weight, and the modified nano-carbon comprises 2-5 parts by weight. It also comprises: pure water, a co-solvent, a wetting agent, a dispersant, a leveling agent, and silica. The weight parts of each component are: pure water: 20-30 parts by weight, co-solvent: 5-10 parts by weight, wetting agent: 0.2-1 part by weight, dispersant: 1-2 parts by weight, leveling agent: 0.1-0.3 parts by weight, and silica: 3-8 parts by weight.

[0020] An embodiment of the method for preparing the adhesive according to the present invention includes: dispersing waterborne acrylic resin, waterborne polyurethane resin, pure water, co-solvent, wetting agent, dispersant, and leveling agent by continuous stirring for 20-30 minutes to obtain an initial coating; adding carbon black, modified nano-carbon, and silica to the initial coating and continuously stirring for 1-2 hours to obtain a waterborne matte black light-absorbing adhesive. A curing agent and pure water are added to the waterborne matte black light-absorbing adhesive to obtain a mixed adhesive.

[0021] In one embodiment of the application of the water-based matte black light-absorbing adhesive prepared by this invention, the method includes: placing the mixed adhesive into a dispensing device and controlling the pressure in the spray gun to apply the mixed adhesive to the object to be dispensed, thereby obtaining a coating film. The water-based matte black light-absorbing adhesive, curing agent, and pure water in the mixed adhesive have a weight ratio of 100:3~8:5~20. The pressure in the spray gun is 0.5~3 kg / cm², the drying temperature is 60~80 degrees Celsius, and the drying time is 30~90 minutes. The coating film thickness is 10~90 μm.

[0022] Example 1 This invention relates to a water-based matte black light-absorbing adhesive, comprising: water-based acrylic acid ester, water-based polyurethane resin, carbon black, and modified nano-carbon.

[0023] In this embodiment, the water-based acrylate exists in emulsion form with particle diameters typically ranging from 0.1 to 1 μm. During the drying process, as the moisture evaporates, the emulsion particles gradually approach and compress, eventually fusing into a continuous film. This film-forming property ensures that the black pigment and matting agent are uniformly dispersed in the coating, preventing cracking and peeling.

[0024] Polyurethane molecular chains are composed of alternating "hard segments" (containing polar groups such as urethane and urea groups, forming rigid regions) and "soft segments" (such as polyether and polyester long chains, forming flexible regions). Soft segments provide elasticity and flexibility, while hard segments maintain structural strength through intermolecular forces (hydrogen bonds), enabling the coating to deform without easily breaking.

[0025] The particle size of carbon black is between 100 and 600 mesh.

[0026] Modified nano-carbon, also known as altered nano-carbon, refers to nano-carbon that has undergone modification treatment, wherein the particle size of the nano-carbon is 1–100 nm. The modification treatment may include: 1. Localized Chemical Reaction Modification: A treatment agent (coupling agent, organic matter, inorganic matter, etc.) is first added, and then the functional groups on the surface of the nano-carbon react chemically with it to achieve the modification purpose. Localized chemical reaction modification processes mainly include dry and wet methods. The dry method involves sequentially adding nano-carbon powder and a surface modifier to the modifier to perform surface modification.

[0027] 2. Surface Coating Modification: The nano-carbon particles and the coating material are linked through van der Waals forces or physical methods to achieve the modification purpose. A surface modifier or superdispersant is added to the nano-carbon preparation solution. During the production of nano-carbon, the surface modifier is coated onto the surface of the nano-carbon, resulting in the final product existing in the form of uniform particles.

[0028] 3. Masterbatch Filler Modification: By mixing a certain proportion of resin masterbatch, nano-carbon, and surfactant, the surface of the nano-carbon is modified simultaneously to obtain the masterbatch filler. The masterbatch filler can be: polyethylene wax calcium carbonate masterbatch, irregular polypropylene calcium carbonate masterbatch (APP masterbatch), and resin calcium carbonate masterbatch filler, etc.

[0029] Furthermore, the water-based matte black light-absorbing adhesive also includes: pure water, co-solvent, wetting agent, dispersant, leveling agent, and silica.

[0030] The following components can be used: Pure water (deionized water or distilled water); Cosolvents (sodium benzoate, sodium salicylate, p-aminobenzoic acid, ethanol, citric acid, etc.); Wetting agents (polyethylene oxide alkyl phenyl ethers, polyethylene oxide fatty acid esters, etc.); Dispersants (sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, fatty acid polyethylene glycol esters, etc.); Leveling agents (silicone oil, polyether polyester modified organosiloxanes, polydimethylsiloxanes, etc.); and fumed silica or precipitated silica.

[0031] In one example, the weight parts of each component of the water-based matte black light-absorbing adhesive are: Water-based acrylic acid: 10-20 parts by weight.

[0032] Waterborne polyurethane resin: 30-50 parts by weight.

[0033] Pure water: 20-30 parts by weight.

[0034] 5-10 parts by weight of co-solvent.

[0035] Wetting agent: 0.2 to 1 part by weight.

[0036] Dispersant: 1-2 parts by weight.

[0037] Leveling agent: 0.1 to 0.3 parts by weight.

[0038] Carbon black: 3 to 5 parts by weight.

[0039] Modified nano-carbon: 2-5 parts by weight.

[0040] Silicon dioxide: 3 to 8 parts by weight.

[0041] The waterborne acrylic acid ester is 15-18 parts by weight, the waterborne polyurethane resin is 35-45 parts by weight, the carbon black is 4 parts by weight, and the modified nano carbon is 3-4 parts by weight.

[0042] Example 2 This invention provides a method for preparing a water-based matte light-absorbing adhesive, specifically for manufacturing the water-based matte light-absorbing adhesive of Example 1. The method includes: dispersing water-based acrylic resin, water-based polyurethane resin, pure water, co-solvent, wetting agent, dispersant, and leveling agent under continuous stirring for 20-30 minutes to obtain an initial coating; adding carbon black, modified nano-carbon, and silica to the initial coating and continuously stirring for 1-2 hours to obtain a water-based matte black light-absorbing adhesive. The method further includes: weighing the following components by weight: water-based acrylic resin: 10-20 parts by weight; water-based polyurethane resin: 30-50 parts by weight; further: pure water: 20-30 parts by weight; co-solvent: 5-10 parts by weight; wetting agent: 0.2-1 parts by weight; dispersant: 1-2 parts by weight; leveling agent: 0.1-0.3 parts by weight; carbon black: 3-5 parts by weight. Modified nano-carbon: 2-5 parts by weight. Silica: 3-8 parts by weight. Preferably, the waterborne acrylic ester is 15-18 parts by weight, the waterborne polyurethane resin is 35-45 parts by weight, the carbon black is 4 parts by weight, and the modified nano-carbon is 3-4 parts by weight.

[0043] After the water-based matte light-absorbing adhesive of the present invention is applied to form a coating film, the reflectance wavelength of the visible light spectrum (400nm~780nm) is tested, and the reflectance absorption can reach ≤1.5% to 3%. The gloss is ≤0.1 degrees when tested with a 60-degree angle photometer.

[0044] Example 3 Embodiment 3 of the present invention provides a dotting method for water-based matte light-absorbing adhesive, i.e., the application of the adhesive, for dotting the water-based matte extra-black light-absorbing coating described in Embodiment 1 onto the gap in the middle of a Mini / Micro LED display to form a coating film. The method includes: A curing agent and pure water are added to the water-based matte black light-absorbing adhesive to obtain a mixed adhesive.

[0045] The mixed adhesive is placed in a dispensing device, and the pressure in the spray gun is controlled to apply the mixed adhesive to the object to be dispensed in a dispensing manner to obtain a coating film.

[0046] The water-based matte black light-absorbing adhesive, curing agent, and pure water in the mixed adhesive are in a weight ratio of 100:3~8:5~20.

[0047] The pressure in the spray gun is 0.5-3 kg / cm2, the drying temperature is 60-80 degrees Celsius, and the drying time is 30-90 minutes.

[0048] The coating thickness is 10~90μm.

[0049] The water-based matte black light-absorbing adhesive described in this invention, after being applied to form a coating film, can greatly absorb external light sources, thereby reducing the visual color differences generated when the human eye views a Mini / Micro LED display screen, making its visual colors more concentrated, vibrant, and the image clearer, thus improving the display effect.

[0050] The reflectance of the light source was measured in the visible light spectrum at wavelengths of 400nm to 780nm. The reflectance absorption was ≤1.5% to 3%, and the gloss was ≤0.1 degrees when measured with a 60-degree angle photometer.

[0051] This invention features low VOC emissions and is environmentally friendly. A matte black adhesive is applied to the gaps in the Mini / Micro LED display glass, substrate, PCB substrate, and silicon-based backplane using a dispensing machine. The water-based matte black light-absorbing adhesive shields the original color and gloss of the substrate, preventing any blurring caused by the Mini / Micro LED's illumination of the light source, thus achieving visible light absorption. Furthermore, this invention uses water as a solvent for the water-based coating, saving significant resources, eliminating fire hazards during construction, reducing air pollution, and improving working conditions. It is highly environmentally friendly due to its low VOC emissions and resource conservation.

[0052] It should be clarified that the present invention is not limited to the specific structures and processes described above. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0053] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0054] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A water-based matte black light-absorbing adhesive, characterized in that, include: The product comprises waterborne acrylic acid ester, waterborne polyurethane resin, carbon black, and modified nano-carbon, wherein the waterborne acrylic acid ester comprises 10-20 parts by weight, the waterborne polyurethane resin comprises 30-50 parts by weight, the carbon black comprises 3-5 parts by weight, and the modified nano-carbon comprises 2-5 parts by weight.

2. The water-based matte black light-absorbing adhesive according to claim 1, characterized in that, Also includes: Pure water, cosolvent, wetting agent, dispersant, leveling agent, silica.

3. The water-based matte black light-absorbing adhesive according to claim 2, characterized in that, The weight parts of each component are as follows: Pure water: 20-30 parts by weight; Co-solvent: 5-10 parts by weight; Wetting agent: 0.2 to 1 part by weight; Dispersant: 1-2 parts by weight; Leveling agent: 0.1–0.3 parts by weight; Silicon dioxide: 3 to 8 parts by weight.

4. The water-based matte black light-absorbing adhesive according to claim 3, characterized in that, Also includes: The waterborne acrylic acid ester is 15-18 parts by weight, the waterborne polyurethane resin is 35-45 parts by weight, the carbon black is 4 parts by weight, and the modified nano carbon is 3-4 parts by weight.

5. A method for preparing the water-based matte black light-absorbing adhesive according to any one of claims 2 to 4, characterized in that, The method includes: The water-based acrylic resin, water-based polyurethane resin, pure water, cosolvent, wetting agent, dispersant, leveling agent are continuously stirred for 20-30 minutes to disperse evenly, thus obtaining the initial coating. Carbon black, modified nano-carbon, and silicon dioxide are added to the initial coating and stirred continuously for 1-2 hours to mix evenly, thus obtaining a water-based matte black light-absorbing adhesive.

6. A dotting method for the water-based matte black light-absorbing adhesive according to any one of claims 1-4, characterized in that, Add a curing agent and pure water to the water-based matte black light-absorbing adhesive to obtain a mixed adhesive; The mixed adhesive is placed in a dispensing device, and the pressure in the spray gun is controlled to apply the mixed adhesive to the object to be dispensed in a dispensing manner to obtain a coating film.

7. The dotting method according to claim 6, characterized in that, The water-based matte black light-absorbing adhesive, curing agent, and pure water in the mixed adhesive are in a weight ratio of 100:3~8:5~20.

8. The dotting method according to claim 6 or 7, characterized in that, Also includes: The pressure in the spray gun is 0.5–3 kg / cm². 2 Drying temperature 60~80 degrees Celsius, drying time 30~90 minutes.

9. The dotting method according to claim 6 or 7, characterized in that, The coating thickness is 10~90μm.

10. The dotting method according to claim 8, characterized in that, The coating thickness is 10~90μm.