Formula and preparation method of multicolor ink-jet printing ink

Abstract

The invention discloses a preparation method of multicolor ink-jet printing ink, which comprises the following steps: during preparation, firstly, respectively adding photonic crystal nanoparticles and response dye into a biodegradable solvent, and fully dispersing through ultrasonic treatment; then, adding a multifunctional stabilizer, and continuously stirring until a uniform ink matrix is formed; finally, through a micro-fluidic technology or other precise mixing technologies, it is ensured that all the components are precisely mixed according to the proportion, and the multicolor ink-jet printing ink with the excellent performance is obtained. The photonic crystal nanoparticles and the response dye are adopted, so that the color brilliance of the ink is remarkably improved, and a printed image is more vivid and lifelike; by using the biodegradable solvent and the multifunctional stabilizer, the stability of the ink is enhanced, and the service life of the ink is prolonged; due to the biodegradability of the solvent, the pollution to the environment is reduced, and the environment-friendly requirement is met.

Description

Technical Field

[0001] This invention relates to the field of ink technology, specifically to a multicolor inkjet printing ink formulation and preparation method. Background Technology

[0002] In existing inkjet printing technologies, ink performance plays a crucial role in print quality and results. However, traditional inkjet printing inks have some limitations, such as insufficient color vibrancy, poor stability, and environmental unfriendliness.

[0003] To address these issues, researchers have been working to develop novel inkjet printing ink formulations. Photonic crystal nanoparticles, as a novel material, possess unique optical properties that can significantly improve the color vibrancy and stability of inks. Furthermore, the use of biodegradable solvents and multifunctional stabilizers also contributes to improving the environmental friendliness and stability of the inks.

[0004] Therefore, the multicolor inkjet printing ink formulation of this invention has significant meaning and application value. It not only meets people's demand for high-quality printing but also reduces environmental impact, possessing broad market prospects and application potential. Summary of the Invention

[0005] The purpose of this invention is to provide a multicolor inkjet printing ink formulation and preparation method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multicolor inkjet printing ink formulation, characterized in that it comprises photonic crystal nanoparticles, responsive dyes, biodegradable solvents, and multifunctional stabilizers, with the specific weight percentages as follows: Photonic crystal nanoparticles: Composition: Photonic crystal nanoparticles synthesized from metals and organic ligands, possessing an optical band gap; Proportion: 5%-10% of the total ink mass; Response dyes: Components: Dyes modified by molecular engineering; Proportion: 2%-5% of the total ink mass; Biodegradable solvents: Components: A mixture of bio-based methanol, glycerol, and water; Proportion: Bio-based methanol 30%-40%, glycerol 10%-20%, water 40%-50%; Multifunctional stabilizer: Components: Polymer emulsion, such as polyvinyl alcohol or polyacrylate; Proportion: 1%-3% of the total ink mass.

[0007] Preferably, the photonic crystal nanoparticles are prepared using the following method: S1. Material Preparation: Metal precursors: salts of gold, silver, or aluminum; Organic ligands: such as hexadecyltrimethylammonium bromide or sodium dodecyl sulfate; Reducing agents: such as sodium borohydride or ascorbic acid; Solvents: such as water or ethanol; S2. Synthesis of photonic crystal nanoparticles: The metal precursor is dissolved in a solvent to form a metal ion solution; Organic ligands are added to form complexes with metal ions. This process is carried out at room temperature with a stirring speed of 200 to 400 rpm for 30 minutes to 1 hour. Slowly add the reducing agent to initiate the reduction reaction and generate metal nanoparticles. The addition rate of the reducing agent should be controlled at 0.1 mL / min to 0.5 mL / min, the reaction temperature should be maintained at 20°C to 25°C, and the reaction time should be 1 hour to 2 hours. During the reaction, the size and shape of the nanoparticles are adjusted by controlling parameters such as pH, temperature, and reaction time. S3. Formation of photonic crystal structure: The synthesized metal nanoparticles were separated by centrifugation and washed 3-5 times with deionized water or ethanol to remove unreacted substances. The washed nanoparticles are redispersed in a solvent and self-assembled to form photonic crystals with periodic structures. During the self-assembly process, the structure of the photonic crystal is controlled by changing the solvent evaporation rate, temperature, and nanoparticle concentration.

[0008] Preferably, the proportions of the photonic crystal nanoparticles are as follows: The proportion of the metal precursor: 0.01 M to 0.1 M of the total reaction solution; The ratio of organic ligands to metal precursors is 1:1 to 5:1. The ratio of reducing agent: the concentration of reducing agent is between 0.05M and 0.2M; The rest are solvents.

[0009] Preferably, the responsive dye includes any one of a thermosensitive dye, a photosensitive dye, or a pH-sensitive dye.

[0010] A method for preparing a multicolor inkjet printing ink includes the following steps: First, photonic crystal nanoparticles and responsive dyes are added to a biodegradable solvent and dispersed by ultrasonic treatment; then, a multifunctional stabilizer is added and stirring is continued until a uniform ink matrix is ​​formed; finally, microfluidic technology or other precise mixing technology is used to ensure that the components are precisely mixed in the above proportions to obtain a high-performance multicolor inkjet printing ink.

[0011] Preferably, the dispersion of photonic crystal nanoparticles and responsive dyes is as follows: First, the pre-synthesized photonic crystal nanoparticles and responsive dyes are added separately to a biodegradable solvent and dispersed using an ultrasonic processor. The frequency of the ultrasonic waves is typically set between 20 kHz and 40 kHz, the power is between 100 W and 300 W, and the processing time is between 30 minutes and 1 hour to ensure that the nanoparticles and dye particles are fully dispersed in the solvent. During the dispersion process, the temperature of the solvent should be maintained between 20°C and 25°C to prevent the dye from degrading due to excessive temperature.

[0012] Preferably, the addition and mixing of the multifunctional stabilizer is as follows: the multifunctional stabilizer is slowly added to the well dispersed photonic crystal nanoparticles and dye solution while stirring. The stirring speed is set at 300 rpm to 500 rpm and the stirring time is 1 hour to 2 hours to ensure that the stabilizer is evenly distributed in the ink and forms a stable ink matrix. The amount of stabilizer added should be calculated based on the total mass of the ink to ensure that it accounts for 1%-3% of the total mass of the ink.

[0013] Preferably, the precise mixing and ink performance optimization are as follows: using microfluidic technology or other precise mixing technology, the above-dispersed photonic crystal nanoparticles, dyes and stabilizers are mixed in a predetermined ratio. During the microfluidic mixing process, the flow rate should be controlled between 1 mL / min and 5 mL / min. The mixing time is adjusted according to the flow rate and the design parameters of the mixer. After mixing, the ink performance is tested, including viscosity, surface tension, color stability, etc. The ink formula is fine-tuned according to the test results to achieve the best printing effect.

[0014] The multicolor inkjet printing ink formulation and preparation method proposed in this invention have the following advantages: 1. High color vibrancy: The use of photonic crystal nanoparticles and responsive dyes significantly improves the color vibrancy of the ink, making the printed images more vivid and realistic.

[0015] 2. Good stability: The use of biodegradable solvents and multifunctional stabilizers enhances the stability of the ink and extends its service life.

[0016] 3. Environmentally friendly: The biodegradability of the solvent reduces environmental pollution and meets environmental protection requirements.

[0017] 4. Multifunctionality: Depending on different application requirements, the type of responsive dye can be adjusted to achieve multiple functions such as thermosensitive, photosensitizing, or pH sensitive.

[0018] 5. Broad application prospects: Applicable to various inkjet printing equipment, with broad market prospects and application potential. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides a technical solution: a multi-color inkjet printing ink formulation, comprising photonic crystal nanoparticles, responsive dyes, biodegradable solvents, and multifunctional stabilizers, with the following specific weight percentage ratios: Photonic crystal nanoparticles: Composition: Photonic crystal nanoparticles synthesized from metals and organic ligands, possessing an optical band gap; Proportion: 5%-10% of the total ink mass; The method for preparing the photonic crystal nanoparticles is as follows: S1. Material Preparation: Metal precursors: salts of gold, silver, or aluminum; Organic ligands: such as hexadecyltrimethylammonium bromide or sodium dodecyl sulfate; Reducing agents: such as sodium borohydride or ascorbic acid; Solvents: such as water or ethanol; S2. Synthesis of photonic crystal nanoparticles: The metal precursor is dissolved in a solvent to form a metal ion solution; Organic ligands are added to form complexes with metal ions. This process is carried out at room temperature with a stirring speed of 200 to 400 rpm for 30 minutes to 1 hour. Slowly add the reducing agent to initiate the reduction reaction and generate metal nanoparticles. The addition rate of the reducing agent should be controlled at 0.1 mL / min to 0.5 mL / min, the reaction temperature should be maintained at 20°C to 25°C, and the reaction time should be 1 hour to 2 hours. During the reaction, the size and shape of the nanoparticles are adjusted by controlling parameters such as pH, temperature, and reaction time. S3. Formation of photonic crystal structure: The synthesized metal nanoparticles were separated by centrifugation and washed 3-5 times with deionized water or ethanol to remove unreacted substances. The washed nanoparticles are redispersed in a solvent and self-assembled to form photonic crystals with periodic structures. During the self-assembly process, the structure of the photonic crystal is controlled by changing the solvent evaporation rate, temperature, and nanoparticle concentration. The proportions of the photonic crystal nanoparticles are as follows: The proportion of the metal precursor: 0.01 M to 0.1 M of the total reaction solution; The ratio of organic ligands to metal precursors is 1:1 to 5:1. The ratio of reducing agent: the concentration of reducing agent is between 0.05M and 0.2M; The rest are solvents; Response dyes: Components: Dyes modified by molecular engineering, including any one of thermosensitive dyes, photosensitive dyes, or pH-sensitive dyes; Proportion: 2%-5% of the total ink mass; Biodegradable solvents: Components: A mixture of bio-based methanol, glycerol, and water; Proportion: Bio-based methanol 30%-40%, glycerol 10%-20%, water 40%-50%; Multifunctional stabilizer: Components: Polymer emulsion, such as polyvinyl alcohol or polyacrylate; Proportion: 1%-3% of the total ink mass.

[0021] A method for preparing a multicolor inkjet printing ink includes the following steps: First, photonic crystal nanoparticles and responsive dyes are added to a biodegradable solvent and dispersed by ultrasonic treatment; then, a multifunctional stabilizer is added and stirring is continued until a uniform ink matrix is ​​formed; finally, microfluidic technology or other precise mixing technology is used to ensure that the components are precisely mixed in the above proportions to obtain a high-performance multicolor inkjet printing ink.

[0022] The dispersion of photonic crystal nanoparticles and responsive dyes is as follows: First, the pre-synthesized photonic crystal nanoparticles and responsive dyes are added separately to a biodegradable solvent and dispersed using an ultrasonic processor. The frequency of the ultrasonic waves is usually set between 20 kHz and 40 kHz, the power is between 100 W and 300 W, and the processing time is between 30 minutes and 1 hour to ensure that the nanoparticles and dye particles are fully dispersed in the solvent. During the dispersion process, the temperature of the solvent should be maintained between 20°C and 25°C to prevent the dye from degrading due to excessive temperature.

[0023] The addition and mixing of the multifunctional stabilizer are as follows: Slowly add the multifunctional stabilizer to the well dispersed photonic crystal nanoparticles and dye solution while stirring. The stirring speed is set at 300 rpm to 500 rpm, and the stirring time is 1 to 2 hours to ensure that the stabilizer is evenly distributed in the ink and forms a stable ink matrix. The amount of stabilizer added should be calculated based on the total mass of the ink to ensure that it accounts for 1% to 3% of the total mass of the ink.

[0024] The precise mixing and ink performance optimization are as follows: Using microfluidic technology or other precise mixing techniques, the above-dispersed photonic crystal nanoparticles, dyes, and stabilizers are mixed in a predetermined ratio. During the microfluidic mixing process, the flow rate should be controlled between 1 mL / min and 5 mL / min. The mixing time is adjusted according to the flow rate and the design parameters of the mixer. After mixing, the ink performance is tested, including viscosity, surface tension, color stability, etc. The ink formulation is fine-tuned based on the test results to achieve the best printing effect.

[0025] Example 1: Multicolor inkjet printing ink formulation: Photonic crystal nanoparticles account for 8% of the total mass of the ink; the preparation method is as follows: Metal precursor: gold salt, concentration 0.05M; Organic ligand: hexadecyltrimethylammonium bromide, with a molar ratio of 3:1 to the metal precursor; Reducing agent: Sodium borohydride, concentration 0.1M; Solvent: Ethanol; During the preparation process, the stirring speed was 300 rpm and the reaction time was 1.5 hours.

[0026] Responsive dyes: Thermosensitive dyes, accounting for 3% of the total ink mass.

[0027] Biodegradable solvents: Bio-based methanol: 32%; Glycerin: 15%; Water: 40%.

[0028] Multifunctional stabilizer: Polyvinyl alcohol, accounting for 2% of the total ink mass.

[0029] Preparation method of multicolor inkjet printing ink: Dispersion of photonic crystal nanoparticles and responsive dyes: ultrasonic frequency of 30kHz, power of 200W, treatment time of 45 minutes, and solvent temperature of 23°C.

[0030] Addition and mixing of multifunctional stabilizer: Stir at 400 rpm for 1.5 hours.

[0031] Precise mixing and ink performance optimization: The flow rate is 3 mL / min, and the mixing time is determined based on the flow rate and mixer design parameters.

[0032] The experimental data are as follows: Color vibrancy: Analysis of the printed image using professional color measurement instruments showed that the ink significantly improved color saturation, contrast, and brightness. Specific parameters are as follows: Color saturation increased by 30%.

[0033] Contrast ratio increased by 25%.

[0034] Brightness increased by 20%.

[0035] stability: After being stored at room temperature for 6 months, the ink's performance showed no significant change. Even after long-term storage, parameters such as viscosity, surface tension, and pH value remained stable, with no precipitation, stratification, or discoloration observed. Specific parameters are as follows: Viscosity change rate: ±5%.

[0036] Surface tension change rate: ±3%.

[0037] pH change rate: ±0.5.

[0038] Environmental friendliness: The use of biodegradable solvents reduces environmental pollution and meets environmental protection requirements. Biodegradation tests on this ink showed that it can be decomposed by microorganisms within a certain time, reducing its harm to the environment. Specific parameters are as follows: Biodegradability: Over 80%.

[0039] The following is the corresponding table: Example 2: Multicolor inkjet printing ink formulation: Photonic crystal nanoparticles account for 5% of the total mass of the ink; Metal precursor: silver salt, concentration 0.08M; Organic ligand: sodium dodecyl sulfate, with a molar ratio of 4:1 to the metal precursor; Reducing agent: ascorbic acid, concentration 0.15M; Solvent: Ethanol; During the preparation process, the stirring speed was 350 rpm and the reaction time was 2 hours.

[0040] Responsive dyes: Photosensitive dyes, accounting for 4.5% of the total ink mass; Biodegradable solvents: Bio-based methanol: 35%; Glycerin: 12%; Water: 41%.

[0041] Multifunctional stabilizer: polyacrylate, accounting for 2.5% of the total ink mass.

[0042] Preparation method of multicolor inkjet printing ink: Dispersion of photonic crystal nanoparticles and responsive dyes: ultrasonic frequency of 35 kHz, power of 250 W, treatment time of 50 minutes, and solvent temperature of 24°C.

[0043] Addition and mixing of multifunctional stabilizer: Stir at 450 rpm for 2 hours.

[0044] Precise mixing and ink performance optimization: The flow rate is 4 mL / min, and the mixing time is determined based on the flow rate and mixer design parameters.

[0045] The experimental data are as follows: Color vibrancy: A comparative printing experiment with traditional ink, using the same printer and printing settings, showed that the ink produced images with more vibrant and realistic colors. Specific parameters are as follows: Color saturation increased by 35%.

[0046] Contrast ratio increased by 30%.

[0047] Brightness increased by 25%.

[0048] stability: After being stored under high temperature and humidity conditions for 3 months, the ink's performance remained stable. Accelerated aging tests in a high temperature and humidity environment showed minimal changes in parameters such as viscosity, surface tension, and pH value, with no significant performance degradation. Specific parameters are as follows: Viscosity change rate: ±3%.

[0049] Surface tension change rate: ±2%.

[0050] pH change rate: ±0.3.

[0051] Environmental friendliness: The use of bio-based methanol reduces the amount of organic solvents used, thus minimizing environmental impact. Compared to traditional organic solvents, bio-based methanol has lower volatility and a smaller impact on air quality. Specific parameters are as follows: The use of organic solvents has been reduced by 50%.

[0052] Emissions of volatile organic compounds (VOCs) have been reduced by 40%.

[0053] The following is the corresponding table: Example 3: Multicolor inkjet printing ink formulation: Photonic crystal nanoparticles account for 8% of the total mass of the ink; Metal precursor: aluminum salt, concentration 0.1M; Organic ligand: hexadecyltrimethylammonium bromide, with a molar ratio of 5:1 to the metal precursor; Reducing agent: Sodium borohydride, concentration 0.2M; Solvent: Water; During the preparation process, the stirring speed was 400 rpm and the reaction time was 2 hours.

[0054] Responsive dyes: pH-sensitive dyes, comprising 5% of the total ink mass.

[0055] Biodegradable solvents: Bio-based methanol: 30%; Glycerin: 14%; Water: 40%.

[0056] Multifunctional stabilizer: Polyvinyl alcohol, accounting for 3% of the total weight of the ink.

[0057] Preparation method of multicolor inkjet printing ink: Dispersion of photonic crystal nanoparticles and responsive dyes: ultrasonic frequency of 40kHz, power of 300W, treatment time of 60 minutes, and solvent temperature of 25°C.

[0058] Addition and mixing of multifunctional stabilizer: Stir at 500 rpm for 2 hours.

[0059] Precise mixing and ink performance optimization: The flow rate is 5 mL / min, and the mixing time is determined based on the flow rate and mixer design parameters.

[0060] The experimental data are as follows: Color vibrancy: The ink produces images with 40% higher color vibrancy compared to traditional inks. Tests on different colors show that this ink exhibits superior color vibrancy across a wide range of colors, with a particularly noticeable effect on bright, vivid colors. Specific parameters are as follows: Red: Color saturation increased by 45%.

[0061] Blue: Color saturation increased by 42%.

[0062] Green: Color saturation increased by 40%.

[0063] Qualitative: After long-term storage, the ink particles were uniformly distributed without any sedimentation. Analysis of the ink using a particle size analyzer showed that the particles were uniform in size and narrowly distributed, and no particle aggregation or sedimentation occurred after long-term storage. Specific parameters are as follows: Average particle diameter: 200 nm.

[0064] Particle distribution range: 150nm-250nm.

[0065] Environmental friendliness: The use of glycerin increases the biocompatibility of the ink, making it more environmentally friendly. Glycerin is a natural biocompatible substance, harmless to humans and the environment. Using glycerin as a solvent can reduce the toxicity and irritation of the ink. Specific parameters are as follows: Glycerin content: 30%.

[0066] Biocompatibility: Good.

[0067] The following is the corresponding table: Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-color inkjet printing ink formulation, characterized in that, It includes photonic crystal nanoparticles, responsive dyes, biodegradable solvents, and multifunctional stabilizers, with the following specific weight percentages: Photonic crystal nanoparticles: Composition: Photonic crystal nanoparticles synthesized from metals and organic ligands, possessing an optical band gap; Proportion: 5%-10% of the total ink mass; Response dyes: Components: Dyes modified by molecular engineering; Proportion: 2%-5% of the total ink mass; Biodegradable solvents: Components: A mixture of bio-based methanol, glycerol, and water; Proportion: Bio-based methanol 30%-40%, glycerol 10%-20%, water 40%-50%; Multifunctional stabilizer: Components: Polymer emulsion, such as polyvinyl alcohol or polyacrylate; Proportion: 1%-3% of the total ink mass.

2. The multicolor inkjet printing ink formulation according to claim 1, characterized in that, The method for preparing the photonic crystal nanoparticles is as follows: S1. Material Preparation: Metal precursors: salts of gold, silver, or aluminum; Organic ligands: such as hexadecyltrimethylammonium bromide or sodium dodecyl sulfate; Reducing agents: such as sodium borohydride or ascorbic acid; Solvents: such as water or ethanol; S2. Synthesis of photonic crystal nanoparticles: The metal precursor is dissolved in a solvent to form a metal ion solution; Organic ligands are added to form complexes with metal ions. This process is carried out at room temperature with a stirring speed of 200 to 400 rpm for 30 minutes to 1 hour. Slowly add the reducing agent to initiate the reduction reaction and generate metal nanoparticles. The addition rate of the reducing agent should be controlled at 0.1 mL / min to 0.5 mL / min, the reaction temperature should be maintained at 20°C to 25°C, and the reaction time should be 1 hour to 2 hours. During the reaction, the size and shape of the nanoparticles are adjusted by controlling parameters such as pH, temperature, and reaction time. S3. Formation of photonic crystal structure: The synthesized metal nanoparticles were separated by centrifugation and washed 3-5 times with deionized water or ethanol to remove unreacted substances. The washed nanoparticles are redispersed in a solvent and self-assembled to form photonic crystals with periodic structures. During the self-assembly process, the structure of the photonic crystal is controlled by changing the solvent evaporation rate, temperature, and nanoparticle concentration.

3. The multicolor inkjet printing ink formulation according to claim 2, characterized in that, The proportions of the photonic crystal nanoparticles are as follows: The proportion of the metal precursor: 0.01 M to 0.1 M of the total reaction solution; The ratio of organic ligands to metal precursors is 1:1 to 5:

1. The ratio of reducing agent: the concentration of reducing agent is between 0.05M and 0.2M; The rest are solvents.

4. The method for preparing a multicolor inkjet printing ink according to claim 3, characterized in that, The responsive dye includes any one of a thermosensitive dye, a photosensitive dye, or a pH-sensitive dye.

5. The method for preparing a multicolor inkjet printing ink according to claim 4, characterized in that, The preparation process includes the following steps: First, photonic crystal nanoparticles and responsive dyes are added to a biodegradable solvent and then dispersed by ultrasonic treatment. Then, add the multifunctional stabilizer and continue stirring until a uniform ink matrix is ​​formed; finally, use microfluidic technology or other precise mixing techniques to ensure that the components are precisely mixed in the above proportions to obtain high-performance multicolor inkjet printing ink.

6. The method for preparing a multicolor inkjet printing ink according to claim 5, characterized in that, The dispersion of photonic crystal nanoparticles and responsive dyes is as follows: First, the pre-synthesized photonic crystal nanoparticles and responsive dyes are added separately to a biodegradable solvent and dispersed using an ultrasonic processor. The frequency of the ultrasonic waves is usually set between 20 kHz and 40 kHz, the power is between 100 W and 300 W, and the processing time is between 30 minutes and 1 hour to ensure that the nanoparticles and dye particles are fully dispersed in the solvent. During the dispersion process, the temperature of the solvent should be maintained between 20°C and 25°C to prevent the dye from degrading due to excessive temperature.

7. The method for preparing a multicolor inkjet printing ink according to claim 6, characterized in that, The addition and mixing of the multifunctional stabilizer are as follows: Slowly add the multifunctional stabilizer to the well dispersed photonic crystal nanoparticles and dye solution while stirring. The stirring speed is set at 300 rpm to 500 rpm, and the stirring time is 1 to 2 hours to ensure that the stabilizer is evenly distributed in the ink and forms a stable ink matrix. The amount of stabilizer added should be calculated based on the total mass of the ink to ensure that it accounts for 1% to 3% of the total mass of the ink.

8. The method for preparing a multicolor inkjet printing ink according to claim 7, characterized in that, The precise mixing and ink performance optimization are as follows: Using microfluidic technology or other precise mixing techniques, the above-dispersed photonic crystal nanoparticles, dyes, and stabilizers are mixed in a predetermined ratio. During the microfluidic mixing process, the flow rate should be controlled between 1 mL / min and 5 mL / min. The mixing time is adjusted according to the flow rate and the design parameters of the mixer. After mixing, the ink performance is tested, including viscosity, surface tension, color stability, etc. The ink formulation is fine-tuned based on the test results to achieve the best printing effect.