High-stability digital discharge printing ink-jet ink and preparation process thereof

Abstract

The invention relates to the technical field of ink, in particular to high-stability digital discharge printing ink-jet ink and a preparation process thereof. The high-stability digital discharge printing ink-jet ink is prepared from the following raw materials in parts by weight: 60-80 parts of a solvent, 10-20 parts of a discharge agent, 2-4 parts of filler, 1-3 parts of a humectant and 0.4-1 part of an active agent. According to the invention, sodium alginate is used as natural anionic polysaccharide, nano calcium carbonate in the filler can be wrapped through hydrogen bonds and electrostatic interaction by using hydroxyl and carboxyl contained in a molecular chain of sodium alginate to form composite structure microspheres, and Span 80 and paraffin can further modify the surface morphology of the microspheres by using hydrophobic interaction of Span 80 and paraffin; after the ink is dried, the composite structure microspheres can be combined with ink components, a continuous film is formed on the surface of a fabric, nano calcium carbonate and adsorbed pigment molecules are fixed, damage of external factors to pigments is isolated, the coloring life is prolonged, and therefore the stability of the digital discharge printing ink-jet ink is improved.

Description

Technical Field

[0001] This invention relates to the field of ink technology, specifically to a high-stability digital discharge inkjet ink and its preparation process. Background Technology

[0002] Digital discharge inkjet ink is a special ink suitable for digital discharge printing technology. It can locally destroy the original dye color system on fabrics containing disperse dyes by inkjet printing, forming white or light-colored patterns.

[0003] In existing technologies, traditional digital discharge inkjet inks use a mixture of discharge agent and water, which leads to instability in the ink system, making the resulting patterns prone to peeling off and resulting in poor performance. Therefore, this invention provides a highly stable digital discharge inkjet ink and its preparation process. Summary of the Invention

[0004] The purpose of this invention is to provide a high-stability digital discharge inkjet ink and its preparation process. The digital discharge inkjet ink prepared by this invention not only has good coloring stability, but also excellent viscosity stability, effectively improving the performance of digital discharge inkjet ink.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A highly stable digital discharge inkjet ink comprises the following raw materials in parts by weight: 60-80 parts solvent, 10-20 parts discharge agent, 2-4 parts filler, 1-3 parts humectant, and 0.4-1 part surfactant.

[0007] The filler is prepared by the following method:

[0008] S1: Additive preparation, the raw materials for the additive include sodium alginate, nano calcium carbonate, deionized water, Span 80, paraffin wax, and treatment solution;

[0009] S2: Preparation of excipients. The raw materials for excipients include citric acid, 1,2,3,4-butanetetracarboxylic acid, deionized water, formic acid, triethanolamine, and polyquaternium-7. The mass of the excipients is 10-20% of the mass of the additives.

[0010] S3: Mixing treatment, additives and excipients are mixed to obtain filler.

[0011] Further, the method for preparing the additive is as follows: sodium alginate, nano-calcium carbonate, and deionized water are added to a mixer, which is set to 60-100 rpm and stirred for 8-12 hours to obtain a mixture. The mixture, Span 80, paraffin wax, and treatment liquid are added to a reaction vessel, which is set to a temperature of 60-70°C and a stirring speed of 40-60 rpm. The mixture is stirred at a constant temperature for 20-40 minutes. The resulting product is added to a centrifuge, which is set to 8000-10000 rpm and centrifuged for 6-10 minutes. The supernatant is discarded from the centrifuged product to obtain a precipitate. The precipitate is washed with deionized water and then sent to an oven, which is set to 40-60°C and dried for 6-8 hours to obtain the additive.

[0012] Furthermore, the mass ratio of sodium alginate, nano-calcium carbonate, and deionized water is 1:(0.2-0.3):(30-40), and the mass ratio of the mixed solution, Span 80, paraffin, and treatment solution is 1:(0.02-0.04):(0.2-0.4):(0.1-0.2).

[0013] Further, the treatment solution is prepared by the following method: camphor is dissolved in anhydrous ethanol and soaked for 20-40 minutes, then filtered to remove solid impurities. The obtained product is subjected to vacuum distillation at 40°C to remove ethanol, yielding a crude material. The crude material, bromobutane, and N-methylimidazole are added to a reaction vessel. The reaction vessel is set at a temperature of 60-80°C and a stirring speed of 200-400 rpm. The mixture is stirred at a constant temperature for 10-20 hours. The obtained product is washed with ethyl acetate and then placed in an oven at 40-60°C for drying for 4-6 hours. The obtained product is mixed with 3-5 times its mass of deionized water to obtain the treatment solution.

[0014] Furthermore, the mass ratio of camphor to anhydrous ethanol is 1:(5-7), and the mass ratio of crude material, bromobutane, and N-methylimidazole is 1:(0.2-0.3):(0.1-0.2).

[0015] Further, the excipient is prepared by the following method: citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water are added to a mixer, which is set to 400-600 rpm and stirred for 40-60 minutes to obtain a premix. The premix, formic acid, triethanolamine, and polyquaternium-7 are added to a mixer, which is set to 200-400 rpm and stirred for 20-40 minutes to obtain the excipient.

[0016] Furthermore, the mass ratio of citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water is 1:(0.06-0.08):(4-6), and the mass ratio of premix, formic acid, triethanolamine, and polyquaternium-7 is 1:(0.03-0.05):(0.02-0.04):(0.04-0.06).

[0017] Further, the mixing process is as follows: the additives and excipients are added to a reaction vessel, the reaction vessel is set to a temperature of 40-50°C, the stirring speed is 200-400 rpm, and the mixture is stirred at a constant temperature for 40-60 minutes. The resulting product is then added to a centrifuge, which is set to 8000-10000 rpm for 6-10 minutes. The supernatant is discarded from the centrifuged product to obtain a precipitate. The precipitate is washed with deionized water and then placed in an oven at 50-70°C for 4-6 hours. After drying, the precipitate is ground to a particle size ≤2 μm to complete the mixing process and obtain the filler.

[0018] Furthermore, the stripping agent is thiourea dioxide, the solvent is dipropylene glycol methyl ether, the humectant is glycerin, and the surfactant is sorbitan oleate.

[0019] Secondly, the present invention also provides a preparation process for high-stability digital discharge inkjet ink, including the following steps: weighing solvent, discharge agent, filler, humectant and activator as needed and adding them to a mixer, setting the mixer to 400-600 rpm and stirring for 40-60 minutes, filtering the resulting product to obtain high-stability digital discharge inkjet ink.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, during the preparation of digital discharge inkjet ink, sodium alginate, as a natural anionic polysaccharide, utilizes the hydroxyl and carboxyl groups in its molecular chain to encapsulate nano-calcium carbonate in the filler through hydrogen bonding and electrostatic interactions, forming composite microspheres. This serves to fix the pigment and improve the coloring stability of the ink. Span 80 and paraffin can further modify the surface morphology of the microspheres through their hydrophobic properties, enhancing their compatibility with dipropylene glycol methyl ether. After the ink dries, the composite microspheres can bind to the ink components, forming a continuous film on the fabric surface, fixing the nano-calcium carbonate and adsorbed pigment molecules, isolating the pigments from external factors, extending the coloring life, and thus improving the stability of the digital discharge inkjet ink.

[0022] 2. In this invention, the addition of the treatment liquid can fix the discharge agent component in the filler component, reduce its migration, and further improve the coloring stability. The carboxyl group of 1,2,3,4-butanetetracarboxylic acid in the auxiliary material can undergo esterification reaction with the hydroxyl group of sodium alginate to form a cross-linked structure, which enhances the binding strength of the filler in the ink system. The cationic group of polyquaternium-7 can form electrostatic adsorption with the carboxyl group of sodium alginate, which further consolidates the structural stability, avoids the component from stratifying after the ink ages at high temperature, and improves its viscosity stability. Attached Figure Description

[0023] Figure 1 This invention provides a formulation diagram of a highly stable digital discharge inkjet ink and its preparation process. Detailed Implementation

[0024] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0026] Example 1:

[0027] Raw material preparation: 60 parts solvent, 10 parts discharge agent, 2 parts filler, 1 part humectant, 0.4 parts surfactant;

[0028] Packing material preparation:

[0029] S1: Additive preparation, the raw materials for the additive include sodium alginate, nano calcium carbonate, deionized water, Span 80, paraffin wax, and treatment solution;

[0030] The stripping agent is thiourea dioxide, the solvent is dipropylene glycol methyl ether, the moisturizer is glycerin, and the surfactant is sorbitan oleate.

[0031] Sodium alginate, nano-calcium carbonate, and deionized water were added to a mixer and stirred at 60 rpm for 8 hours to obtain a mixture. The mixture, Span 80, paraffin wax, and treatment solution were added to a reaction vessel and stirred at 60°C for 20 minutes. The resulting product was then added to a centrifuge and centrifuged at 8000 rpm for 6 minutes. The supernatant was discarded from the centrifuged product, and the precipitate was washed with deionized water and then dried in an oven at 40°C for 6 hours to obtain an additive. The mass ratio of sodium alginate, nano-calcium carbonate, and deionized water was 1:0.2:30, and the mass ratio of the mixture, Span 80, paraffin wax, and treatment solution was 1:0.02:0.2:0.1.

[0032] The treatment solution was prepared by the following method: camphor was dissolved in anhydrous ethanol and soaked for 20 min. After filtration, solid impurities were removed. The product was then subjected to vacuum distillation at 40 °C to remove ethanol, yielding a crude material. The crude material, bromobutane, and N-methylimidazole were added to a reaction vessel. The reaction vessel was set to 60 °C and the stirring speed was 200 rpm. The mixture was stirred at this constant temperature for 10 h. The product was washed with ethyl acetate and then placed in an oven at 40 °C for 4 h. The product was then mixed with 3 times its mass of deionized water to prepare the treatment solution. The mass ratio of camphor to anhydrous ethanol was 1:5, and the mass ratio of the crude material, bromobutane, and N-methylimidazole was 1:0.2:0.1.

[0033] S2: Preparation of excipients. The raw materials for excipients include citric acid, 1,2,3,4-butanetetracarboxylic acid, deionized water, formic acid, triethanolamine, and polyquaternium salt-7. The mass of the excipients is 10% of the mass of the additives.

[0034] The excipients are prepared by the following method: citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water are added to a mixer, which is set to 400 rpm and stirred for 40 min to obtain a premix. The premix, formic acid, triethanolamine, and polyquaternium-7 are added to a mixer, which is set to 200 rpm and stirred for 20 min to obtain the excipients. The mass ratio of citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water is 1:0.06:4, and the mass ratio of the premix, formic acid, triethanolamine, and polyquaternium-7 is 1:0.03:0.02:0.04.

[0035] S3: Mixing treatment, additives and excipients are mixed to obtain filler;

[0036] The mixing process is as follows: Additives and excipients are added to a reaction vessel, the reaction vessel is set to a temperature of 40℃, the stirring speed is 200 rpm, and the mixture is stirred at a constant temperature for 40 min. The resulting product is added to a centrifuge, which is set to 8000 rpm for 6 min. The supernatant is discarded from the centrifuged product to obtain a precipitate. The precipitate is washed with deionized water and then sent to an oven, which is set to 50℃ for 4 h. After that, it is ground to a particle size ≤2μm to complete the mixing process and obtain the filler.

[0037] Preparation of finished product: Weigh out the solvent, discharge agent, filler, humectant and surfactant as needed and add them to the mixer. Set the mixer to 400 rpm and stir for 40 minutes. Filter the resulting product to obtain a high-stability digital discharge inkjet ink.

[0038] Example 2:

[0039] Raw material preparation: 70 parts solvent, 15 parts discharge agent, 3 parts filler, 2 parts humectant, 0.7 parts surfactant;

[0040] Packing material preparation:

[0041] S1: Additive preparation, the raw materials for the additive include sodium alginate, nano calcium carbonate, deionized water, Span 80, paraffin wax, and treatment solution;

[0042] The stripping agent is thiourea dioxide, the solvent is dipropylene glycol methyl ether, the moisturizer is glycerin, and the surfactant is sorbitan oleate.

[0043] Sodium alginate, nano-calcium carbonate, and deionized water were added to a mixer and stirred at 80 rpm for 10 hours to obtain a mixture. The mixture, Span 80, paraffin wax, and treatment solution were added to a reaction vessel and stirred at 65°C and 50 rpm for 30 minutes. The resulting product was then added to a centrifuge and centrifuged at 9000 rpm for 8 minutes. The supernatant was discarded from the centrifuged product, and the precipitate was washed with deionized water and then dried in an oven at 50°C for 7 hours to obtain an additive. The mass ratio of sodium alginate, nano-calcium carbonate, and deionized water was 1:0.25:35, and the mass ratio of the mixture, Span 80, paraffin wax, and treatment solution was 1:0.03:0.3:0.15.

[0044] The treatment solution was prepared by the following method: camphor was dissolved in anhydrous ethanol and soaked for 30 min. After filtration, solid impurities were removed. The product was then subjected to vacuum distillation at 40 °C to remove ethanol, yielding a crude material. The crude material, bromobutane, and N-methylimidazole were added to a reaction vessel. The reaction vessel was set to 70 °C and the stirring speed was 300 rpm. The mixture was stirred at this constant temperature for 15 h. The product was washed with ethyl acetate and then placed in an oven at 50 °C for 5 h. The product was then mixed with 4 times its mass of deionized water to prepare the treatment solution. The mass ratio of camphor to anhydrous ethanol was 1:6, and the mass ratio of the crude material, bromobutane, and N-methylimidazole was 1:0.25:0.15.

[0045] S2: Preparation of excipients. The raw materials for excipients include citric acid, 1,2,3,4-butanetetracarboxylic acid, deionized water, formic acid, triethanolamine, and polyquaternium-7. The mass of the excipients is 15% of the mass of the additives.

[0046] The excipients are prepared by the following method: citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water are added to a mixer, which is set to 500 rpm and stirred for 50 min to obtain a premix. The premix, formic acid, triethanolamine, and polyquaternium-7 are added to a mixer, which is set to 300 rpm and stirred for 30 min to obtain the excipients. The mass ratio of citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water is 1:0.07:5, and the mass ratio of the premix, formic acid, triethanolamine, and polyquaternium-7 is 1:0.04:0.03:0.05.

[0047] S3: Mixing treatment, additives and excipients are mixed to obtain filler;

[0048] The mixing process is as follows: Additives and excipients are added to a reaction vessel, the reaction vessel is set to a temperature of 45℃, the stirring speed is 300 rpm, and the mixture is stirred at a constant temperature for 50 min. The resulting product is added to a centrifuge, which is set to 9000 rpm for 8 min. The supernatant is discarded from the centrifuged product to obtain a precipitate. The precipitate is washed with deionized water and then sent to an oven, which is set to 60℃ for 5 h. After that, it is ground to a particle size ≤2 μm to complete the mixing process and obtain the filler.

[0049] Preparation of finished product: Weigh out the solvent, discharge agent, filler, humectant and surfactant as needed and add them to the mixer. Set the mixer to 500 rpm and stir for 50 minutes. Filter the resulting product to obtain a high-stability digital discharge inkjet ink.

[0050] Example 3:

[0051] Raw material preparation: 80 parts solvent, 20 parts discharge agent, 4 parts filler, 3 parts humectant, 1 part surfactant;

[0052] Packing material preparation:

[0053] S1: Additive preparation, the raw materials for the additive include sodium alginate, nano calcium carbonate, deionized water, Span 80, paraffin wax, and treatment solution;

[0054] The stripping agent is thiourea dioxide, the solvent is dipropylene glycol methyl ether, the moisturizer is glycerin, and the surfactant is sorbitan oleate.

[0055] Sodium alginate, nano-calcium carbonate, and deionized water were added to a mixer and stirred at 100 rpm for 12 hours to obtain a mixture. The mixture, Span 80, paraffin wax, and treatment solution were added to a reaction vessel and stirred at 70°C and 60 rpm for 40 minutes. The resulting product was then added to a centrifuge and centrifuged at 10,000 rpm for 10 minutes. The supernatant was discarded from the centrifuged product, and the precipitate was washed with deionized water and then dried in an oven at 60°C for 8 hours to obtain an additive. The mass ratio of sodium alginate, nano-calcium carbonate, and deionized water was 1:0.3:40, and the mass ratio of the mixture, Span 80, paraffin wax, and treatment solution was 1:0.04:0.4:0.2.

[0056] The treatment solution was prepared by the following method: camphor was dissolved in anhydrous ethanol and soaked for 40 min. After filtration, solid impurities were removed. The product was then subjected to vacuum distillation at 40 °C to remove ethanol, yielding a crude material. The crude material, bromobutane, and N-methylimidazole were added to a reaction vessel. The reaction vessel was set to 80 °C and the stirring speed was 400 rpm. The mixture was stirred at this constant temperature for 20 h. The product was washed with ethyl acetate and then placed in an oven at 60 °C for drying for 6 h. The product was then mixed with 5 times its mass of deionized water to prepare the treatment solution. The mass ratio of camphor to anhydrous ethanol was 1:7, and the mass ratio of the crude material, bromobutane, and N-methylimidazole was 1:0.3:0.2.

[0057] S2: Preparation of excipients. The raw materials for excipients include citric acid, 1,2,3,4-butanetetracarboxylic acid, deionized water, formic acid, triethanolamine, and polyquaternium-7. The mass of the excipients is 20% of the mass of the additives.

[0058] The excipients are prepared by the following method: citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water are added to a mixer, which is set to 600 rpm and stirred for 60 min to obtain a premix. The premix, formic acid, triethanolamine, and polyquaternium-7 are added to a mixer, which is set to 400 rpm and stirred for 40 min to obtain the excipients. The mass ratio of citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water is 1:0.08:6, and the mass ratio of the premix, formic acid, triethanolamine, and polyquaternium-7 is 1:0.05:0.04:0.06.

[0059] S3: Mixing treatment, additives and excipients are mixed to obtain filler;

[0060] The mixing process is as follows: Additives and excipients are added to a reaction vessel, the reaction vessel is set to a temperature of 50℃, the stirring speed is 400 rpm, and the mixture is stirred at a constant temperature for 60 min. The resulting product is added to a centrifuge, which is set to 10000 rpm for 10 min. The supernatant is discarded from the centrifuged product to obtain a precipitate. The precipitate is washed with deionized water and then sent to an oven, which is set to 70℃ for drying for 6 h. After drying, the product is ground to a particle size ≤2 μm to complete the mixing process and obtain the filler.

[0061] Preparation of finished product: Weigh out the solvent, discharge agent, filler, humectant and surfactant as needed and add them to the mixer. Set the mixer to 600 rpm and stir for 60 minutes. Filter the resulting product to obtain a high-stability digital discharge inkjet ink.

[0062] Comparative Example 1: The difference between this comparative example and Example 1 is that this comparative example does not contain 1,2,3,4-butanetetracarboxylic acid.

[0063] Comparative Example 2 differs from Example 1 in that it does not contain any excipients; instead, it uses an equal amount of additives to replace fillers.

[0064] Comparative Example 3 differs from Example 1 in that it does not contain filler.

[0065] Performance testing: The digital discharge inkjet inks prepared in Examples 1, 2, 3, 1, 2, and 3, and the test data are recorded in the table below:

[0066] Table 1

[0067]

[0068] In the performance test, the method for testing color stability is as follows: the digital discharge inkjet ink prepared in Examples 1, 2, 3, 1, 2, and 3 is used to print patterns on the fabric surface. The fabric with the printed pattern is left to stand for 24 hours at a temperature of 28°C and a humidity of 60%, and then continuously irradiated in an ultraviolet aging test chamber for 7 days at a wavelength of 340nm and a temperature of 60°C. The pattern state on the fabric surface is determined according to the gray scale rating in GB / T 250-2008, thereby determining the stability of the digital discharge inkjet ink.

[0069] The viscosity fluctuation test method is as follows: First, the viscosity of the digital discharge inkjet inks prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3 is tested. Then, the inks are placed in an oven and left to stand at 60°C for 14 days. After that, the viscosity is tested again to obtain the viscosity fluctuation data.

[0070] It is evident that the coloring stability and viscosity stability of the digital discharge inkjet inks prepared in Comparative Examples 1, 2, and 3 are all lower than those in Examples 1, 2, and 3. This indicates that in the preparation of digital discharge inkjet inks, sodium alginate, as a natural anionic polysaccharide, utilizes the hydroxyl and carboxyl groups contained in its molecular chain to encapsulate the nano-calcium carbonate in the filler through hydrogen bonding and electrostatic interactions, forming composite microspheres. Span 80 and paraffin can further modify the surface morphology of the microspheres through their hydrophobic effects, enhancing their compatibility with dipropylene glycol methyl ether. After the ink dries, the composite microspheres can combine with the ink components to form a continuous film on the fabric surface, fixing the nano-calcium carbonate and adsorbed pigment molecules, isolating the pigments from external factors, extending the coloring life, and thus improving the stability of the digital discharge inkjet ink.

[0071] The carboxyl groups of 1,2,3,4-butanetetracarboxylic acid in the additives can undergo esterification with the hydroxyl groups of sodium alginate to form a cross-linked structure, which enhances the binding strength of the filler in the ink system. The cationic groups of polyquaternium salt-7 can form electrostatic adsorption with the carboxyl groups of sodium alginate, further consolidating the structural stability, preventing the components from stratifying after high-temperature aging of the ink, and improving its viscosity stability.

[0072] By comparing and analyzing the relevant data in the table, it can be seen that the digital discharge inkjet ink prepared by this invention not only has good coloring stability but also excellent viscosity stability. This indicates that the high-stability digital discharge inkjet ink provided by this invention has a broader market prospect and is more suitable for widespread application.

[0073] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-stability digital discharge inkjet ink, characterized in that: It includes the following raw materials in parts by weight: 60-80 parts solvent, 10-20 parts discharge agent, 2-4 parts filler, 1-3 parts humectant, and 0.4-1 part surfactant; The filler is prepared by the following method: S1: Additive preparation, the raw materials for the additive include sodium alginate, nano calcium carbonate, deionized water, Span 80, paraffin wax, and treatment solution; S2: Preparation of excipients. The raw materials for excipients include citric acid, 1,2,3,4-butanetetracarboxylic acid, deionized water, formic acid, triethanolamine, and polyquaternium-7. The mass of the excipients is 10-20% of the mass of the additives. S3: Mixing treatment, additives and excipients are mixed to obtain filler.

2. The high-stability digital discharge inkjet ink according to claim 1, characterized in that, The additive is prepared as follows: sodium alginate, nano-calcium carbonate, and deionized water are added to a mixer, which is set to 60-100 rpm and stirred for 8-12 hours to obtain a mixture. The mixture, Span 80, paraffin wax, and treatment solution are added to a reaction vessel, which is set to a temperature of 60-70°C and a stirring speed of 40-60 rpm for 20-40 minutes. The resulting product is added to a centrifuge, which is set to 8000-10000 rpm and centrifuged for 6-10 minutes. The supernatant is discarded from the centrifuged product to obtain a precipitate. The precipitate is washed with deionized water and then sent to an oven, which is set to 40-60°C and dried for 6-8 hours to obtain the additive.

3. The high-stability digital discharge inkjet ink according to claim 2, characterized in that, The mass ratio of sodium alginate, nano-calcium carbonate, and deionized water is 1:(0.2-0.3):(30-40), and the mass ratio of the mixed solution, Span 80, paraffin, and treatment solution is 1:(0.02-0.04):(0.2-0.4):(0.1-0.2).

4. The high-stability digital discharge inkjet ink according to claim 2, characterized in that, The treatment solution is prepared by the following method: camphor is dissolved in anhydrous ethanol and soaked for 20-40 minutes. After filtration, solid impurities are removed. The product is then subjected to vacuum distillation at 40°C to remove ethanol, yielding a crude material. The crude material, bromobutane, and N-methylimidazole are added to a reaction vessel. The reaction vessel is set at 60-80°C and the stirring speed is 200-400 rpm. The mixture is stirred at this constant temperature for 10-20 hours. The product is washed with ethyl acetate and then placed in an oven at 40-60°C for 4-6 hours. The product is then mixed with 3-5 times its mass of deionized water to obtain the treatment solution.

5. The high-stability digital discharge inkjet ink according to claim 4, characterized in that, The mass ratio of camphor to anhydrous ethanol is 1:(5-7), and the mass ratio of crude material, bromobutane, and N-methylimidazole is 1:(0.2-0.3):(0.1-0.2).

6. The high-stability digital discharge inkjet ink according to claim 1, characterized in that, The excipients are prepared by the following method: citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water are added to a mixer, which is set to 400-600 rpm and stirred for 40-60 minutes to obtain a premix. The premix, formic acid, triethanolamine, and polyquaternium-7 are added to a mixer, which is set to 200-400 rpm and stirred for 20-40 minutes to obtain the excipients.

7. The high-stability digital discharge inkjet ink according to claim 6, characterized in that, The mass ratio of citric acid, 1,2,3,4-butanetetracarboxylic acid, and deionized water is 1:(0.06-0.08):(4-6), and the mass ratio of premix, formic acid, triethanolamine, and polyquaternium-7 is 1:(0.03-0.05):(0.02-0.04):(0.04-0.06).

8. The high-stability digital discharge inkjet ink according to claim 1, characterized in that, The mixing process is as follows: Additives and excipients are added to a reaction vessel, the reaction vessel is set to a temperature of 40-50℃, the stirring speed is 200-400 rpm, and the mixture is stirred at a constant temperature for 40-60 minutes. The resulting product is then added to a centrifuge, which is set to 8000-10000 rpm for 6-10 minutes. The supernatant is discarded from the centrifuged product to obtain a precipitate. The precipitate is washed with deionized water and then placed in an oven at 50-70℃ for 4-6 hours. After drying, the precipitate is ground to a particle size ≤2μm to complete the mixing process and obtain the filler.

9. The high-stability digital discharge inkjet ink according to claim 1, characterized in that, The stripping agent is thiourea dioxide, the solvent is dipropylene glycol methyl ether, the humectant is glycerin, and the surfactant is sorbitol oleate.

10. The preparation process of the high-stability digital discharge inkjet ink according to any one of claims 1 to 9, characterized in that, The process includes the following steps: Weigh out the solvent, discharge agent, filler, humectant, and surfactant as needed and add them to a mixer. Set the mixer to 400-600 rpm and stir for 40-60 minutes. Filter the resulting product to obtain a high-stability digital discharge inkjet ink.

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