Nano water-based pigment ink-jet ink and preparation method thereof

Abstract

The invention relates to the technical field of ink-jet ink, and discloses nano water-based pigment ink-jet ink, which is prepared from the following formula components: 10 to 20 percent of nano particles, 5 to 10 percent of amine compounds, 2 to 8 percent of dispersing agents, 1 to 5 percent of ionic liquid, 0.5 to 2 percent of fluorescent whitening agents and 60 to 80 percent of ink matrixes. By adopting the nano-particle technology, pigment particles in the ink can be finer and more uniform, so that the color brightness and the pattern fineness can be improved in the printing process. Therefore, the visual effect of the printed matter is more vivid, the color is fuller, the details are clearer, and the nanoparticles can be uniformly dispersed in the ink by adopting an efficient dispersion technology, so that the stability and the dispersity of the ink are improved. Therefore, the problem that the ink deposits or blocks the spray head in the storage or use process can be avoided, and long-term stable use of the ink is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of inkjet inks, and specifically to a nano-aqueous pigment inkjet ink and a preparation method thereof. Background Art

[0002] In the digital age, inkjet technology, as a crucial printing technology, has become an essential tool in various industries. In various application scenarios, inkjet technology plays an indispensable role with its characteristics of high efficiency, flexibility, and precision. However, traditional inkjet inks still have some limitations and challenges in terms of color vividness, stability, and environmental friendliness.

[0003] The pigment particles in traditional inkjet inks are relatively large and usually difficult to achieve a fine and uniform distribution at the nanoscale. Such large pigment particles will limit the color saturation and vividness, affecting the quality of printed products. In addition, the dispersibility of pigment particles is also a problem. After long-term storage or multiple uses, the pigment particles are prone to precipitation or agglomeration, resulting in a decline in ink performance and problems such as nozzle clogging.

[0004] In addition to the problems of pigment particles, traditional inkjet inks usually use organic solvents as the matrix, which poses a major challenge in terms of environmental protection. The volatility of organic solvents will cause certain pollution to the environment, not meeting the urgent environmental protection needs of today's society. In addition, traditional inks are usually mass-produced and difficult to meet personalized printing requirements.

[0005] In view of these problems, the present invention proposes a nano-aqueous pigment inkjet ink and a preparation method thereof to solve the deficiencies of the prior art. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a nano-aqueous pigment inkjet ink and a preparation method thereof, which solve the problems of traditional inkjet inks in terms of color vividness, stability, and environmental friendliness.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A nano-aqueous pigment inkjet ink, comprising the following formulation components:

[0008] Nano-particles: Surface-treated nano-particles with a size distribution range between 10 and 100 nanometers, in a spherical or elliptical shape, and accounting for 10-20% in the formulation;

[0009] Amine compounds: Compounds used to enhance the adhesion and anti-fading performance of the ink, accounting for 5-10% in the formulation;

[0010] Dispersants: Compounds used to improve the dispersibility and stability of nano-particles in the ink, accounting for 2-8% in the formulation;

[0011] Ionic liquid: An additive used to improve the conductivity and stability of the ink, accounting for 1 - 5% in the formulation;

[0012] Fluorescent brightening agent: An additive used to enhance the whiteness of the ink and improve the brightness of printed products, accounting for 0.5 - 2% in the formulation;

[0013] Ink matrix: A matrix component used to adjust the viscosity and rheological properties of the ink, accounting for 60 - 80% in the formulation.

[0014] Preferably, the amine compound is specifically a carbamate compound; the dispersant is specifically a polymer dispersant.

[0015] Preferably, the ionic liquid is specifically a sulfonic acid-based ionic liquid; the fluorescent brightening agent is a styryl fluorescent brightening agent.

[0016] Preferably, the specific steps for surface treatment of the nanoparticles are as follows:

[0017] Prepare nanoparticles: Synthesize and confirm the size and shape of the obtained nanoparticles;

[0018] Select a surface modifier: Select a suitable surface modifier to ensure dispersibility and stability in the ink;

[0019] Mix the nanoparticles and the modifier: Suspend the nanoparticles in a solvent, then gradually add the selected surface modifier, and use a stirrer to mix thoroughly to ensure that the modifier covers the surface of the nanoparticles;

[0020] React and modify: Maintain the reaction conditions and ensure that the modifier is fully combined with the nanoparticles to form a stable surface coating;

[0021] Separate and wash: Separate and wash the treated nanoparticles to remove excess surface modifier and solvent to ensure the purity and stability of the nanoparticles;

[0022] Dry: Finally, dry the nanoparticles to the required state by vacuum drying for subsequent use.

[0023] Preferably, the surface modifier is specifically a silane coupling agent; the solvent includes but is not limited to toluene, xylene, and water.

[0024] Preferably, the mixing time is 12 - 20 hours, the stirring speed may need to be between 200 and 400 revolutions per minute, and the mixing temperature is 30 - 40 degrees.

[0025] Preferably, a method for preparing a nano-aqueous pigment inkjet ink includes the following steps:

[0026] Surface treatment of nanoparticles:

[0027] Synthesize and confirm the size and shape of the obtained nanoparticles to ensure they meet the requirements;

[0028] Select a silane coupling agent as the surface modifier to ensure the dispersion and stability of the nanoparticles in the ink;

[0029] Suspend the nanoparticles in a solvent, gradually add the selected surface modifier, and mix thoroughly;

[0030] Ensure that the modifier covers the surface of the nanoparticles, and then maintain the reaction conditions to allow the modifier to fully bind to the nanoparticles;

[0031] Separate, wash, and dry the treated nanoparticles to ensure the purity and stability of the nanoparticles;

[0032] Ink preparation:

[0033] Add the surface-treated nanoparticles, amine compound, dispersant, ionic liquid, and fluorescent brightener to the ink matrix;

[0034] Use a blender to mix the components thoroughly to ensure uniform dispersion;

[0035] Adjust the pH value and viscosity to ensure the printing performance and stability of the ink;

[0036] Testing and adjustment:

[0037] Test the prepared ink for printing performance, color stability, and durability;

[0038] Adjust the ink formulation according to the test results until a final product that meets the requirements is obtained.

[0039] Preferably, the ink matrix is a polymer emulsion.

[0040] Preferably, the viscosity of the ink is in the range of 10 - 20 mPa·s.

[0041] Preferably, the shape of the nanoparticles is spherical, and their size distribution ranges from 20 to 80 nanometers.

[0042] The present invention provides a nano-aqueous pigment inkjet ink and its preparation method. It has the following beneficial effects:

[0043] 1. By adopting nanoparticle technology in the present invention, the pigment particles in the ink can be finer and more uniform, so the vividness of colors and the fineness of patterns can be improved during the printing process. This means that the visual effect of the printed matter will be more vivid, the colors will be more saturated, and the details will be clearer.

[0044] 2. The present invention can evenly disperse nanoparticles in the ink by adopting an efficient dispersion technology, thereby improving the stability and dispersibility of the ink. This will help to avoid problems such as precipitation or nozzle clogging during the storage or use of the ink, ensuring the long-term stable use of the ink.

[0045] 3. The present invention adopts a customized formulation technology, which can customize and adjust the ink according to the specific needs of users. This flexible formulation makes the ink more suitable for different printing requirements, thus improving the application range and flexibility of the ink.

[0046] 4. The present invention uses an aqueous ink matrix, reducing the impact on the environment and the release of harmful gases. This makes the ink more environmentally friendly and meets the needs of modern society for green products, providing users with a safer and more environmentally friendly printing option. Detailed implementation mode

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0048] The present invention provides a nano-aqueous pigment inkjet ink, which includes the following formulation components:

[0049] Nanoparticles: These surface-treated nanoparticles have a size distribution range between 10 and 100 nanometers, with a spherical or elliptical shape, and account for 10-20% in the formulation. These nanoparticles can provide the fine particles required by the ink, helping to achieve excellent printing effects. Due to their extremely small size and special shape, the nanoparticles can improve the color vividness of the ink and the fineness of the printed pattern.

[0050] Amine compounds: These compounds are used to enhance the adhesion and anti-fading properties of the ink, accounting for 5-10% in the formulation. They can form chemical bonds with the surface of the printing material, improving the adhesion of the ink, making the pattern more durable, and increasing the anti-fading ability of the ink, ensuring that the printed product remains colorful for a long time.

[0051] Dispersants: These compounds are used to improve the dispersibility and stability of nanoparticles in the ink, accounting for 2-8% in the formulation. By maintaining the uniform dispersion of nanoparticles, the dispersants help to prevent particle aggregation and precipitation, thus maintaining the stability of the ink and ensuring the consistency of printing quality.

[0052] Ionic Liquids: These additives are used to improve the conductivity and stability of the ink, and account for 1 - 5% in the formulation. They can enhance the conductivity of the ink, contribute to ensuring the normal operation of the printing device, and improve the stability of the ink, reducing sedimentation and caking of the ink in the device.

[0053] Fluorescent Whitening Agents: These additives are used to enhance the whiteness of the ink and improve the brightness of the printed product, and account for 0.5 - 2% in the formulation. Fluorescent whitening agents can make the printed product emit bright blue - white light under ultraviolet light, increase the whiteness and brightness of the printed product, and make the pattern more distinct.

[0054] Ink Matrix: These matrix components are used to adjust the viscosity and rheological properties of the ink, and account for 60 - 80% in the formulation. The selection of the ink matrix can effectively adjust the viscosity of the ink, ensure the stability and fluidity of the ink during the printing process, and thus guarantee the accuracy and consistency of printing.

[0055] In the above formulation, the functions of each component cooperate with each other and jointly act on the performance of the ink, thus bringing multiple beneficial effects such as bright colors, fine patterns, stable ink, flexible formulation, and environmental protection and safety.

[0056] The amine compound is specifically a carbamate compound; the dispersant is specifically a polymer dispersant.

[0057] Carbamate Compounds: These compounds are a common type of organic compounds. Their role in the ink is to enhance the adhesion and anti - fading properties of the ink. These compounds can form chemical bonds with the surface of the printing material, thereby improving the adhesion of the ink, making the pattern more durable, and increasing the anti - fading ability of the ink to ensure that the printed product remains brightly colored for a long time. The content of carbamate compounds in the ink is 5 - 10%.

[0058] Polymer Dispersants: These dispersants are a type of compounds that can improve the dispersibility and stability of nanoparticles in the ink. They prevent the aggregation and precipitation of particles by interacting with the surface of the nanoparticles, thereby maintaining the stability of the ink and ensuring the consistency of printing quality. The content of polymer dispersants in the ink is 2 - 8%.

[0059] The application of these specific compounds in the ink formulation further strengthens the performance of the ink, making the ink have better adhesion, anti - fading properties and stability. This helps to ensure the continuous stability of the printed product quality and makes the ink more suitable for various printing needs.

[0060] The ionic liquid is specifically a sulfonic acid - based ionic liquid; the fluorescent whitening agent is a styryl fluorescent whitening agent.

[0061] Sulfonic acid-based ionic liquid: Sulfonic acid-based ionic liquid is a special type of ionic liquid, and its role in the ink is to improve the conductivity and stability of the ink. This type of ionic liquid can effectively enhance the conductivity of the ink, contribute to ensuring the normal operation of the printing device, and improve the stability of the ink, reducing the precipitation and caking of the ink in the device. The content of sulfonic acid-based ionic liquid in the ink is 1 - 5%.

[0062] Styryl fluorescent brightener: The role of this type of fluorescent brightener in the ink is to enhance the whiteness of the ink and improve the brightness of the printed product. The styryl fluorescent brightener can make the printed product emit bright blue-white light under ultraviolet light, improve the whiteness and brightness of the printed product, and make the pattern more distinct. The content of styryl fluorescent brightener in the ink is 0.5 - 2%.

[0063] The application of these specific compounds in the ink formulation further enhances the performance of the ink, making the ink have better conductivity, stability and improving the visual effect of the printed product. This helps to ensure the continuous stability of the printed product quality and makes the ink more suitable for various printing needs.

[0064] The specific steps for surface treatment of nanoparticles are as follows:

[0065] Prepare nanoparticles: First, it is necessary to synthesize and confirm the size and shape of the obtained nanoparticles. This can be achieved through different chemical synthesis methods to ensure that the obtained nanoparticles meet the expected requirements.

[0066] Select a surface modifier: According to the characteristics of the nanoparticles and the requirements of the desired application, select a suitable surface modifier to ensure the dispersibility and stability in the ink. The selection of the surface modifier has a crucial impact on the subsequent performance of the nanoparticles.

[0067] Mix nanoparticles and modifier: Suspend the nanoparticles in a solvent, then gradually add the selected surface modifier and mix well using a blender to ensure that the modifier covers the surface of the nanoparticles. This step is to ensure that the surface modifier can fully cover the surface of the nanoparticles and achieve a good coating effect.

[0068] Reaction and modification: Maintain the reaction under appropriate conditions to ensure that the modifier is fully combined with the nanoparticles to form a stable surface coating. This step is to ensure that the surface modifier can chemically react or physically adsorb with the surface of the nanoparticles, thereby stabilizing the surface properties of the nanoparticles.

[0069] Separation and washing: Separate and wash the treated nanoparticles to remove the excess surface modifier and solvent to ensure the purity and stability of the nanoparticles. This step is to remove the excess substances, ensure the purity and stability of the nanoparticles, and avoid adverse effects on the ink performance.

[0070] Drying: Finally, through vacuum drying, the nanoparticles are dried to the desired state for subsequent use. This step is to prepare the nanoparticles into dry powder or other forms for subsequent processing and application.

[0071] These steps ensure the dispersibility, stability and performance of the nanoparticles in the ink, thus improving the quality and performance of the ink.

[0072] The surface modifier is specifically a silane coupling agent; the solvents include but are not limited to toluene, xylene and water.

[0073] Silane coupling agents are a type of commonly used surface modifiers, which play a role in coating and modifying the surface of nanoparticles. Using silane coupling agents can effectively improve the dispersibility and stability of nanoparticles, while enhancing their compatibility and dispersion performance in the ink. This helps to ensure the uniform dispersion and stability of nanoparticles in the ink, thus improving the printing performance and quality of the ink.

[0074] Toluene and xylene are usually used as organic solvents and play an important role in the preparation and processing of nanoparticles. They can be used to suspend nanoparticles and surface modifiers, promoting their mixing and reaction. Water can be used as a dispersion medium for nanoparticles and also plays an important role in the preparation and processing of nanoparticles.

[0075] The application of these specific surface modifiers and solvents helps to ensure the performance and stability of nanoparticles and improve the quality and performance of the ink.

[0076] The mixing time is 12 - 20 hours, the stirring speed may need to be between 200 and 400 revolutions per minute, and the mixing temperature is 30 - 40 degrees.

[0077] Mixing time: Within the range of 12 - 20 hours, sufficient time is required to ensure the full mixing and reaction of nanoparticles and surface modifiers.

[0078] Stirring speed: Between 200 and 400 revolutions per minute to ensure uniform mixing and promote the full contact and reaction of nanoparticles and surface modifiers.

[0079] Mixing temperature: Between 30 - 40 degrees Celsius. An appropriate temperature helps to promote the mixing reaction, but at the same time, attention needs to be paid not to exceed the stable temperature range of nanoparticles or surface modifiers.

[0080] These specific mixing conditions are to ensure that nanoparticles and surface modifiers can be fully mixed and reacted to achieve the effect of surface modification, thereby improving the dispersibility and stability of nanoparticles in the ink.

[0081] A preparation method of a nano-aqueous pigment inkjet ink, comprising the following steps:

[0082] Surface treatment of nanoparticles:

[0083] Synthesize and confirm the size and shape of the nanoparticles to ensure they meet the requirements.

[0084] Select a silane coupling agent as the surface modifier to ensure the dispersion and stability of the nanoparticles in the ink.

[0085] Suspend the nanoparticles in a solvent, gradually add the selected surface modifier, and mix thoroughly.

[0086] Ensure that the modifier covers the surface of the nanoparticles, and then maintain the reaction conditions to allow the modifier to fully bind to the nanoparticles.

[0087] Separate, wash, and dry the treated nanoparticles to ensure the purity and stability of the nanoparticles.

[0088] Ink preparation:

[0089] Add the surface-treated nanoparticles, amine compounds, dispersants, ionic liquids, and fluorescent brighteners to the ink matrix.

[0090] Use a blender to mix the components thoroughly to ensure uniform dispersion.

[0091] Adjust the pH value and viscosity to ensure the printing performance and stability of the ink.

[0092] Testing and adjustment:

[0093] Test the prepared ink for printing performance, color stability, and durability.

[0094] Adjust the ink formulation according to the test results until a final product that meets the requirements is obtained.

[0095] The ink matrix is a polymer emulsion.

[0096] During the ink preparation process, add the surface-treated nanoparticles, amine compounds, dispersants, ionic liquids, and fluorescent brighteners to the polymer emulsion. Such an ink matrix usually has good dispersion and stability and is suitable for inkjet printing.

[0097] Using a polymer emulsion as the ink matrix can provide the following advantages:

[0098] The polymer emulsion has good dispersion, which helps the uniform dispersion of nanoparticles and other additives in the ink.

[0099] Polymer emulsions can provide good viscosity and rheological properties, which contribute to the stable ejection of ink in the print head.

[0100] Polymer emulsions can also provide a certain degree of adhesion and durability, which helps the ink to quickly cure and adhere to the printing medium after printing.

[0101] The viscosity of the ink is in the range of 10 - 20 mPa·s.

[0102] This viscosity range is generally suitable for inkjet printing applications because it can ensure the stable ejection of ink in the print head and form clear patterns on the printing medium.

[0103] When preparing the ink, the viscosity of the ink can usually be adjusted to the desired range in the following ways:

[0104] Adjust the type and content of the solvent: Selecting the appropriate solvent type and content can affect the viscosity of the ink. An increase in the content of organic solvents usually reduces the viscosity of the ink.

[0105] Use a diluent: Adding an appropriate amount of diluent can reduce the viscosity of the ink.

[0106] Adjust the solid content: Adjusting the content of the solid components in the ink can affect the viscosity of the ink.

[0107] Through the above methods, the viscosity of the ink can be adjusted to ensure that it is within the desired range of 10 - 20 mPa·s. This can ensure the flow performance and printing performance of the ink in the print head and help obtain clear printing effects.

[0108] The shape of the nanoparticles is spherical, and their size distribution ranges from 20 to 80 nanometers.

[0109] Example 1:

[0110] Prepare the nanoparticles: Obtain surface-treated nanoparticles through chemical synthesis methods. The shape is spherical, and the size distribution ranges from 20 to 80 nanometers.

[0111] Select carbamate compounds as amine compounds, polymer dispersants as dispersants, sulfonic acid-based ionic liquids as ionic liquids, and styryl fluorescent brighteners as fluorescent brighteners.

[0112] Surface-treat the nanoparticles: Suspend the nanoparticles in toluene, gradually add a silane coupling agent, and use a stirrer to mix well to ensure that the modifier covers the surface of the nanoparticles.

[0113] Separation and washing: The processed nanoparticles are separated and washed to remove excess surface modifiers and solvents, ensuring the purity and stability of the nanoparticles.

[0114] Ink preparation: The surface-treated nanoparticles, carbamate compounds, polymer dispersants, sulfonic acid-based ionic liquids, and styrenyl fluorescent brighteners are added to the polymer emulsion ink matrix.

[0115] Stirring and adjustment: The components are thoroughly mixed using a blender, and the pH value and viscosity are adjusted to ensure the printing performance and stability of the ink.

[0116] Testing and adjustment: The prepared ink is tested for printing performance, color stability, and durability, and the ink formulation is adjusted according to the test results.

[0117] In this example, spherical nanoparticles are used, specific compounds and dispersants are employed, and surface treatment is carried out using a silane coupling agent, ultimately obtaining a nano-aqueous pigment inkjet ink with specific properties.

[0118] Example Two:

[0119] Prepare nanoparticles: Surface-treated nanoparticles are prepared by the solvent method, with an elliptical shape and a size distribution range between 30 and 90 nanometers.

[0120] Select other types of amine compounds, dispersants, ionic liquids, and fluorescent brighteners.

[0121] Surface treatment of nanoparticles: Different surface modifiers are used for surface treatment of the nanoparticles.

[0122] Ink preparation: The surface-treated nanoparticles, other types of amine compounds, dispersants, ionic liquids, and fluorescent brighteners are added to the non-polymer emulsion ink matrix.

[0123] Other steps are the same as in Example One.

[0124] In this example, elliptical nanoparticles are used, different types of compounds and dispersants are employed for surface treatment, and different types of ink matrices are used, possibly obtaining nano-aqueous pigment inkjet inks with different characteristics.

[0125] Example Three:

[0126] Prepare nanoparticles: Surface-treated nanoparticles are prepared by the sol-gel method, with a polyhedral shape and a size distribution range between 15 and 75 nanometers.

[0127] Select other types of amine compounds, dispersants, ionic liquids, and fluorescent brighteners.

[0128] Surface-treated nanoparticles: The surfaces of the nanoparticles are treated with other types of surface modifiers.

[0129] Ink preparation: The surface-treated nanoparticles, other types of amine compounds, dispersants, ionic liquids, and fluorescent brighteners are added to an aqueous ink matrix.

[0130] Other steps are the same as in Example 1.

[0131] In this example, polyhedral-shaped nanoparticles are used, other types of compounds and dispersants are used for surface treatment, and different types of ink matrices are used, which may result in nano-aqueous pigment inkjet inks with different properties.

[0132] The above three examples demonstrate the effects of different types, shapes, and processing methods of nanoparticles, as well as different compounds and ink matrices on the performance of nano-aqueous pigment inkjet inks.

[0133] Comparative experiment design:

[0134] Experimental purpose:

[0135] To compare the effects of different surface treatment methods on the performance of nano-aqueous pigment inkjet inks.

[0136] Parameter Example 1 Example 2 Example 3 Particle size distribution 20 - 80nm 30 - 90nm 15 - 75nm Shape Spherical Elliptical Polyhedron Surface treatment method Silane coupling agent Different modifiers Other modifiers Ink matrix Polymer emulsion Non - polymer emulsion Aqueous ink matrix Ink viscosity 10 - 20mPa·s 10 - 20mPa·s 10 - 20mPa·s Printing performance Excellent Good Good Durability Excellent Good Good

[0137] In this comparative experiment, we used different surface treatment methods, different nanoparticle shapes, and ink matrices to conduct comparative tests on printing performance and durability. The results show that the ink of Example 1 performs excellently in terms of printing performance and durability.

[0138] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nano-aqueous pigment inkjet ink, characterized in that, The formulation composition includes the following: Nanoparticles: Surface-treated nanoparticles with a size distribution ranging from 10 to 100 nanometers, spherical or oval in shape, accounting for 10 - 20% in the formulation; Amine compounds: Compounds used to enhance the adhesion and anti-fading properties of the ink, accounting for 5 - 10% in the formulation; Dispersants: Compounds used to improve the dispersibility and stability of nanoparticles in the ink, accounting for 2 - 8% in the formulation; Ionic liquids: Additives used to improve the conductivity and stability of the ink, accounting for 1 - 5% in the formulation; Fluorescent brighteners: Additives used to enhance the whiteness of the ink and improve the brightness of printed products, accounting for 0.5 - 2% in the formulation; Ink matrix: Matrix components used to adjust the viscosity and rheological properties of the ink, accounting for 60 - 80% in the formulation.

2. The nano-aqueous pigment inkjet ink according to claim 1, characterized in that, The amine compound is specifically a carbamate compound; the dispersant is specifically a polymer dispersant.

3. The nano-aqueous pigment inkjet ink according to claim 1, characterized in that, The ionic liquid is specifically a sulfonic acid-based ionic liquid; the fluorescent brightener is a styryl fluorescent brightener.

4. The nano-aqueous pigment inkjet ink according to claim 1, characterized in that The specific steps for surface treatment of the nanoparticles are as follows: Prepare nanoparticles: Synthesize and confirm the size and shape of the obtained nanoparticles; Select a surface modifier: Select a suitable surface modifier to ensure dispersibility and stability in the ink; Mix the nanoparticles and the modifier: Suspend the nanoparticles in a solvent, then gradually add the selected surface modifier and mix well using a blender to ensure that the modifier covers the surface of the nanoparticles; React and modify: Maintain the reaction conditions and ensure that the modifier binds fully with the nanoparticles to form a stable surface coating; Separate and wash: Separate and wash the treated nanoparticles to remove excess surface modifier and solvent, ensuring the purity and stability of the nanoparticles; Dry: Finally, dry the nanoparticles to the required state through vacuum drying for subsequent use.

5. A nano-aqueous pigment inkjet ink according to claim 4, characterized in that, The surface modifier is specifically a silane coupling agent; the solvent includes but is not limited to toluene, xylene, and water.

6. The nano-aqueous pigment inkjet ink according to claim 4, characterized in that, The mixing time is between 12 - 20 hours, the stirring speed may need to be between 200 and 400 revolutions per minute, and the mixing temperature is between 30 - 40 degrees Celsius.

7. A preparation method of a nano-aqueous pigment inkjet ink according to any one of claims 1-6, characterized in that, It includes the following steps: Surface treatment of nanoparticles: Synthesize and confirm the size and shape of the obtained nanoparticles to ensure they meet the requirements; Select a silane coupling agent as the surface modifier to ensure the dispersibility and stability of the nanoparticles in the ink; Suspend the nanoparticles in a solvent, gradually add the selected surface modifier, and mix well; Ensure that the modifier covers the surface of the nanoparticles, then maintain the reaction conditions to enable the full binding of the modifier with the nanoparticles; Separate, wash, and dry the treated nanoparticles to ensure the purity and stability of the nanoparticles; Ink preparation: Add the surface-treated nanoparticles, amine compounds, dispersants, ionic liquids, and fluorescent brighteners to the ink matrix; Use a blender to mix all the components well to ensure uniform dispersion; Adjust the pH value and viscosity to ensure the printing performance and stability of the ink; Testing and adjustment: Test the prepared ink for printing performance, color stability, and durability; Adjust the ink formulation according to the test results until a final product that meets the requirements is obtained.

8. The preparation method of a nano-aqueous pigment inkjet ink according to claim 7, characterized in that, The ink matrix is a polymer emulsion.

9. The preparation method of a nano-aqueous pigment inkjet ink according to claim 7, characterized in that, The viscosity of the ink is in the range of 10 - 20 mPa·s.

10. The preparation method of a nano-aqueous pigment inkjet ink according to claim 7, characterized in that, The shape of the nanoparticles is spherical, and their size distribution ranges from 20 to 80 nanometers.