A high-resolution color inkjet ink and a method for preparing the same

Abstract

The application relates to the field of ink materials, in particular to a high-resolution color inkjet ink and a preparation method thereof. The high-resolution color inkjet ink comprises the following raw materials in mass parts: 60-90 parts of a bio-based solvent, 2-12 parts of a polymeric dispersion, 10-25 parts of an auxiliary oil agent, 5-15 parts of a pigment agent, 0.3-1 part of a bio-based slip agent, 0.1-0.5 part of a synergistic agent and 3-8 parts of an enhancing agent. The color inkjet ink prepared according to the application not only has excellent environmental protection and does not contain mineral oil aromatic hydrocarbons and other substances, but also has good comprehensive use performance, such as high resolution, color, long-term stability, scratch resistance and water resistance, so that the performance requirements of the inkjet ink in the prior art field are greatly met on the basis of realizing the environmental protection concept.

Description

Technical Field

[0001] This application relates to the field of ink materials, and more specifically to a high-resolution color inkjet ink and its preparation method. Background Technology

[0002] Inkjet printing technology, with its excellent color performance and adaptability, has become the mainstream technology in fields such as photo output, advertising printing, and industrial signage. As the market's demands for printing precision and image detail continue to increase, high-resolution printing has become a core direction for technological development. Achieving this goal depends not only on sophisticated printing equipment but, more importantly, on the performance of the ink itself. As an imaging medium, the compositional characteristics of color inkjet ink directly determine the core indicators of the final output, such as resolution, color vibrancy, and durability.

[0003] Currently, the mainstream inkjet inks on the market are mainly divided into two categories: dye-based inks and pigment-based inks. Dye-based inks, due to their small molecular structure, can dissolve in water or organic solvents, thus offering advantages such as vibrant colors, high transparency, and high print resolution, making them widely used in photo-quality image printing. However, dye-based inks have poor lightfastness, water resistance, and scratch resistance; prolonged exposure to light or humidity can easily cause fading or smudging, limiting their application in outdoor advertising or long-term preservation printed materials. In contrast, pigment-based inks use water-insoluble micro-pigment particles as colorants, offering superior lightfastness, weather resistance, and water resistance, making them suitable for applications requiring high image durability. However, pigment particles are typically larger, making them prone to aggregation or sedimentation at the printhead, leading to printhead clogging, affecting print stability and resolution. Furthermore, their color vibrancy is usually slightly inferior to that of dye-based inks.

[0004] Meanwhile, to enhance the mechanical strength and adhesion of ink surfaces, researchers tend to use synthetic resins for performance improvement. However, these modified synthetic resins cannot be decomposed by microorganisms, posing a significant environmental challenge. Furthermore, although existing technologies have made significant progress in improving inkjet ink performance, many challenges remain in achieving a synergistic optimization of high resolution, high color fidelity, long-term stability, and environmental friendliness. Summary of the Invention

[0005] In summary, developing a color inkjet ink that boasts excellent environmental performance while maintaining high overall performance has become one of the most significant research challenges for those skilled in the art. Through in-depth research in this field, the applicant has ultimately proposed a high-resolution color inkjet ink and its preparation method in this application. The color inkjet ink ultimately obtained in this application not only maintains excellent environmental performance, being free of mineral oils and aromatic hydrocarbons, but also simultaneously retains good overall performance characteristics, such as high resolution, color accuracy, long-term stability, scratch resistance, and water resistance. While achieving environmental protection goals, it greatly satisfies the performance requirements of existing technologies for this type of inkjet ink.

[0006] A high-resolution color inkjet ink, by weight, comprises at least the following raw materials: 60-90 parts of bio-based solvent, 2-12 parts of polymer dispersion, 10-25 parts of auxiliary oil, 5-15 parts of pigment, 0.3-1 part of bio-based lubricant, 0.1-0.5 parts of synergist, and 3-8 parts of reinforcing agent.

[0007] Preferably, the bio-based solvent is isopropyl lauryl ester or acetylated tributyl citrate.

[0008] More preferably, the bio-based solvent is isopropyl lauryl ester.

[0009] Preferably, the mass ratio of the bio-based solvent, polymer dispersion and reinforcing agent is (65~85):(3~10):(4~6).

[0010] More preferably, the mass ratio of the bio-based solvent, polymer dispersion and reinforcing agent is (66~82):(3~8):(4.5~5.5).

[0011] Preferably, the polymer dispersion is at least one of styrene-acrylic acid copolymer ammonium salt, polyhydroxystearic acid derivative, modified castor oil polyol, acrylate-maleic anhydride copolymer, and bio-based polyester dispersion.

[0012] More preferably, the polymer dispersion is a polyhydroxystearic acid derivative.

[0013] Most preferably, the polyhydroxystearic acid derivative is Solsperse J909.

[0014] Preferably, the auxiliary oiling agent is at least one selected from tall oil, ethyl oleate, octyl / decyl triglyceride and castor oil.

[0015] More preferably, the auxiliary oil is a combination of tall oil and castor oil.

[0016] Preferably, the mass ratio of tall oil to castor oil is (1~2):(1~2).

[0017] More preferably, the mass ratio of tall oil to castor oil is 1:1.

[0018] Preferably, the pigment is any one of inorganic carbon black pigment, organic blue pigment, organic red pigment, organic purple pigment, and inorganic white pigment.

[0019] More preferably, the inorganic carbon black pigment is bio-based carbon black.

[0020] More preferably, the organic blue pigment is D 7110 F Blue.

[0021] More preferably, the organic red pigment is Red 1171.

[0022] More preferably, the organic purple pigment is Violet 6090.

[0023] More preferably, the inorganic white pigment is titanium dioxide or zinc oxide.

[0024] Preferably, the bio-based lubricant is at least one of fatty acids, erucamide, polyethylene glycol, sugarcane wax derivatives, and sorbitol palmitate.

[0025] More preferably, the bio-based lubricant is a fatty acid and / or erucamide.

[0026] Most preferably, the bio-based lubricant is a fatty acid.

[0027] Preferably, the synergist is any one of reactive pigment derivatives.

[0028] More preferably, the synergist is the reactive pigment derivative Solsperse 22000.

[0029] Preferably, the reinforcing agent is a composition of epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester, and polyglycerol ricinoleate.

[0030] Preferably, the mass ratio of the epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester and polyglycerol ricinoleate is (2~3.5):(1~2):(0.8~1.4).

[0031] More preferably, the mass ratio of the epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester and polyglycerol ricinoleate is (2.5~3.2):(1.2~1.8):(0.9~1.2).

[0032] Most preferably, the mass ratio of the epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester, and polyglycerol ricinoleate is 3:1.5:1.

[0033] The ternary reinforcing agent combination incorporated in this application enhances the overall performance of the ink through synergistic effects. Polyglycerol ricinoleate optimizes ink flow and spreadability, enabling ink droplets to quickly form a uniform liquid film on the media surface and reducing bleeding; epoxidized soybean oil acrylate gradually constructs a flexible cross-linked network during the drying process, enhancing the toughness and durability of the ink film; hydrogenated rosin pentaerythritol ester strengthens the interfacial bonding between the ink and the substrate, improving adhesion. The three work synergistically: the spreading effect of polyglycerol ester creates a uniform substrate for the cross-linking reaction, and rosin ester molecules bridge the cross-linked layer with the media surface, forming a stable composite structure. This combination maintains high-precision ink droplet positioning capability, significantly improves color performance and resistance to physical damage on ordinary paper, while also preserving environmentally friendly properties.

[0034] A method for preparing the above-mentioned high-resolution color inkjet ink includes the following steps: S1: Bio-based solvent, polymer dispersion, pigment, synergist and reinforcing agent are sequentially added to a high-speed disperser for pre-dispersion at a speed of 800~1000 rpm for 30~40 min to form a vortex effect until the powder is uniformly suspended; S2: DCP circulating grinding is performed for 13~15 h at a flow rate of 3~4 kg / min, a grinding pressure of 1.5~2 bar, and a temperature control of 30~40℃; S3: The remaining raw materials are sequentially added and mixed and stirred at 400~600 rpm for 30~35 min to obtain the ink.

[0035] The beneficial effects of this application are:

[0036] 1. The color inkjet ink finally obtained in this application not only maintains excellent environmental protection and does not contain mineral oil aromatic hydrocarbons or other substances, but also maintains good comprehensive performance, such as high resolution, color quality, long-term stability, scratch resistance and water resistance. On the basis of realizing the concept of environmental protection, it greatly meets the performance requirements of the existing technology field for this type of inkjet ink.

[0037] 2. The ternary reinforcing agent combination incorporated in this application enhances the overall performance of the ink through synergistic effects. Polyglycerol ricinoleate optimizes the ink's flow and spreadability, enabling ink droplets to quickly form a uniform liquid film on the media surface, reducing bleeding; epoxidized soybean oil acrylate gradually constructs a flexible cross-linked network during the drying process, enhancing the ink film's toughness and durability; hydrogenated rosin pentaerythritol ester strengthens the interfacial bonding between the ink and the substrate, improving adhesion. The three work synergistically: the spreading effect of polyglycerol ester creates a uniform substrate for the cross-linking reaction, while rosin ester molecules bridge the cross-linked layer and the media surface, forming a stable composite structure. This combination maintains high-precision ink droplet positioning capability, significantly improves color performance and resistance to physical damage on ordinary paper, and retains environmentally friendly characteristics.

[0038] 3. The color inkjet ink of this application not only has excellent inkjet resolution and color performance, but also effectively suppresses ink bleeding and edge blurring on uncoated media such as ordinary paper, which greatly improves the clarity of lines and the color optical density is close to that of special photographic paper, breaking through the application limitations of traditional pigment inks on low-cost media. Attached Figure Description

[0039] Figure 1 This is an inkjet effect diagram of the high-resolution color inkjet ink prepared according to Embodiment 1 of this application.

[0040] Figure 2 The figures show a comparison of simulated inkjet effects of electronic engraving plates in Embodiments 1, 2, and 3 of this application; Embodiment 1 (right), Embodiment 2 (middle), and Embodiment 3 (left) are shown in the figures.

[0041] Figure 3 and Figure 4 This is a test report image of the high-resolution color inkjet ink prepared in Example 1 of this application. Detailed Implementation

[0042] Example 1

[0043] A high-resolution color inkjet ink, by weight, comprises the following raw materials: 73 parts of bio-based solvent, 8 parts of polymer dispersion, 14 parts of auxiliary oil, 8.5 parts of pigment, 0.4 parts of bio-based lubricant, 0.2 parts of synergist, and 4.5 parts of reinforcing agent.

[0044] The bio-based solvent is isopropyl laurate, manufactured by Shanghai Xinzhengxing.

[0045] The polymer dispersion is a polyhydroxystearic acid derivative, Solsperse J909, manufactured by Shanghai Kaikai.

[0046] The auxiliary oiling agent is a combination of tall oil and castor oil in a mass ratio of 1:1. The tall oil is refined tall oil Y09, manufactured by Shanghai Lisen Chemical; the castor oil is refined castor oil, manufactured by Nanjing Yingguan New Materials.

[0047] The pigment is an organic blue pigment, D 7110 F Blue, from Clariant, Switzerland.

[0048] The bio-based lubricant is C-syn Fat 9012, a fatty acid compound, manufactured by Zhuhai Yingjieweite.

[0049] The synergist is Solsperse 22000, an active pigment derivative, manufactured by Shanghai Nuoyu Chemical Co., Ltd.

[0050] The reinforcing agent is a composition of epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester and polyglycerol ricinoleate in a mass ratio of 3:1.5:1.

[0051] Epoxidized soybean oil acrylate GB, Shandong Yukang Chemical; Hydrogenated rosin pentaerythritol ester industrial grade, Jiangsu Runfeng Synthetic; Polyglycerol castor oil ester EEL-60, Jinan Huijinchuan Chemical.

[0052] A method for preparing the above-mentioned high-resolution color inkjet ink includes the following steps: S1: Bio-based solvent, polymer dispersion, pigment, synergist and reinforcing agent are added sequentially to a high-speed disperser for pre-dispersion at a speed of 1000 rpm for 35 min to form a vortex effect until the powder is uniformly suspended; S2: The ink is circulated and ground by DCP for 15 h at a flow rate of 3 kg / min, a grinding pressure of 1.5 bar, and a temperature of 40 °C; S3: The remaining raw materials are added sequentially and mixed and stirred at 600 rpm for 30 min to obtain the final product.

[0053] The inkjet effect of the high-resolution color inkjet ink produced in this embodiment is as follows: Figure 1 As shown.

[0054] The high-resolution color inkjet ink produced in this embodiment is compared with that in Embodiments 2 and 3. Figure 2 As shown.

[0055] The test report for the high-resolution color inkjet ink produced in this embodiment is as follows: Figure 3 and Figure 4 As shown, the results indicate that the inkjet ink prepared in this embodiment contains no mineral oil saturated hydrocarbons or mineral oil aromatic hydrocarbons.

[0056] Example 2

[0057] A high-resolution color inkjet ink, by weight, comprises the following raw materials: 81.7 parts of bio-based solvent, 7.9 parts of polymer dispersion, 12 parts of auxiliary oil, 10.2 parts of pigment, 0.5 parts of bio-based lubricant, 0.2 parts of synergist, and 4.6 parts of reinforcing agent.

[0058] The bio-based solvent is isopropyl laurate, manufactured by Shanghai Xinzhengxing.

[0059] The polymer dispersion is a polyhydroxystearic acid derivative, Solsperse J909, manufactured by Shanghai Kaikai.

[0060] The auxiliary oiling agent is a combination of tall oil and castor oil in a mass ratio of 1:1. The tall oil is refined tall oil Y09, manufactured by Shanghai Lisen Chemical; the castor oil is refined castor oil, manufactured by Nanjing Yingguan New Materials.

[0061] The pigment used is an organic purple pigment, Violet 6090, from Clariant, Switzerland.

[0062] The bio-based lubricant is C-syn Fat 9012, a fatty acid compound, manufactured by Zhuhai Yingjieweite.

[0063] The synergist is Solsperse 22000, an active pigment derivative, manufactured by Shanghai Nuoyu Chemical Co., Ltd.

[0064] The reinforcing agent is a composition of epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester and polyglycerol ricinoleate in a mass ratio of 2.5:2:1.3.

[0065] Epoxidized soybean oil acrylate GB, Shandong Yukang Chemical; Hydrogenated rosin pentaerythritol ester industrial grade, Jiangsu Runfeng Synthetic; Polyglycerol castor oil ester EEL-60, Jinan Huijinchuan Chemical.

[0066] A method for preparing the above-mentioned high-resolution color inkjet ink includes the following steps: S1: Bio-based solvent, polymer dispersion, pigment, synergist and reinforcing agent are added sequentially to a high-speed disperser for pre-dispersion at a speed of 1000 rpm for 35 min to form a vortex effect until the powder is uniformly suspended; S2: The ink is circulated and ground by DCP for 15 h at a flow rate of 3 kg / min, a grinding pressure of 1.5 bar, and a temperature of 40 °C; S3: The remaining raw materials are added sequentially and mixed and stirred at 600 rpm for 30 min to obtain the final product.

[0067] The high-resolution color inkjet ink produced in this embodiment is compared with that in Embodiments 1 and 3. Figure 2 As shown.

[0068] Example 3

[0069] A high-resolution color inkjet ink, by weight, comprises the following raw materials: 68 parts of bio-based solvent, 4.5 parts of polymer dispersion, 18 parts of auxiliary oil, 7.5 parts of pigment, 0.4 parts of bio-based lubricant, 0.2 parts of synergist, and 5.2 parts of reinforcing agent.

[0070] The bio-based solvent is isopropyl laurate, manufactured by Shanghai Xinzhengxing.

[0071] The polymer dispersion is a polyhydroxystearic acid derivative, Solsperse J909, manufactured by Shanghai Kaikai.

[0072] The auxiliary oiling agent is a combination of tall oil and castor oil in a mass ratio of 1:1. The tall oil is refined tall oil Y09, manufactured by Shanghai Lisen Chemical; the castor oil is refined castor oil, manufactured by Nanjing Yingguan New Materials.

[0073] The pigment is an organic red pigment, Red 1171, manufactured by Shanghai Jiehong Pigment Chemical Co., Ltd.

[0074] The bio-based lubricant is C-syn Fat 9012, a fatty acid compound, manufactured by Zhuhai Yingjieweite.

[0075] The synergist is Solsperse 22000, an active pigment derivative, manufactured by Shanghai Nuoyu Chemical Co., Ltd.

[0076] The reinforcing agent is a composition of epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester and polyglycerol ricinoleate in a mass ratio of 3.5:1:0.8.

[0077] Epoxidized soybean oil acrylate GB, Shandong Yukang Chemical; Hydrogenated rosin pentaerythritol ester industrial grade, Jiangsu Runfeng Synthetic; Polyglycerol castor oil ester EEL-60, Jinan Huijinchuan Chemical.

[0078] A method for preparing the above-mentioned high-resolution color inkjet ink includes the following steps: S1: Bio-based solvent, polymer dispersion, pigment, synergist and reinforcing agent are added sequentially to a high-speed disperser for pre-dispersion at a speed of 1000 rpm for 35 min to form a vortex effect until the powder is uniformly suspended; S2: The ink is circulated and ground by DCP for 15 h at a flow rate of 3 kg / min, a grinding pressure of 1.5 bar, and a temperature of 40 °C; S3: The remaining raw materials are added sequentially and mixed and stirred at 600 rpm for 30 min to obtain the final product.

[0079] The high-resolution color inkjet ink produced in this embodiment is compared with that of Embodiments 1 and 2. Figure 2 As shown.

[0080] Comparative Example 1

[0081] The only difference between this comparative example and Example 1 is that: a high-resolution color inkjet ink, by weight, comprises: 65 parts of bio-based solvent, 4.5 parts of polymer dispersion, 18 parts of auxiliary oil, 8.5 parts of pigment, 0.4 parts of bio-based lubricant, 0.2 parts of synergist, and 0.5 parts of reinforcing agent.

[0082] The rest of the implementation methods are the same.

[0083] Comparative Example 2

[0084] The only difference between this comparative example and Example 1 is that: a high-resolution color inkjet ink, by weight, comprises: 73 parts of bio-based solvent, 4.5 parts of polymer dispersion, 18 parts of auxiliary oil, 8.5 parts of pigment, 0.4 parts of bio-based lubricant, 0.2 parts of synergist, and 18 parts of reinforcing agent.

[0085] The rest of the implementation methods are the same.

[0086] Comparative Example 3

[0087] The only difference between this comparative example and Example 1 is that the auxiliary oil is a combination of tall oil and castor oil in a mass ratio of 0.2:1.5.

[0088] The rest of the implementation methods are the same.

[0089] Comparative Example 4

[0090] The only difference between this comparative example and Example 1 is that: a high-resolution color inkjet ink, by weight, comprises: 95 parts of bio-based solvent, 1.5 parts of polymer dispersion, 18 parts of auxiliary oil, 8.5 parts of pigment, 0.4 parts of bio-based lubricant, 0.05 parts of synergist, and 5.2 parts of reinforcing agent.

[0091] The rest of the implementation methods are the same.

[0092] Comparative Example 5

[0093] The only difference between this comparative example and Example 1 is that the reinforcing agent is a composition of epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester and polyglycerol ricinoleate in a mass ratio of 5:0.5:0.3.

[0094] The rest of the implementation methods are the same.

[0095] Comparative Example 6

[0096] The only difference between this comparative example and Example 1 is that the reinforcing agent is a composition of epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester and polyglycerol ricinoleate in a mass ratio of 1:3:2.

[0097] The rest of the implementation methods are the same.

[0098] Performance testing

[0099] 1. Inkjet Test: Using non-woven paper as a substrate, the inkjet effect of the inks in Example 1 was tested. The results of Example 1 are as follows: Figure 1 As shown; and simultaneously using an electronic engraving plate to simulate the actual inkjet environment, comparative images of the inkjet effects in Examples 1-3 are presented, with results as follows. Figure 2 As shown.

[0100] 2. Fiberglass filtration: 50g / 1μm test, record filtration time. Abnormal fiberglass filtration time: If 50g of inkjet ink passes through a 1μm filter in 6-7 seconds or more, the ink is abnormal and the printhead is more likely to clog when printed. Normal fiberglass filtration time: If 50g of inkjet ink passes through a 1μm filter in less than 6-7 seconds, the ink is normal and the printhead is less likely to clog when printed. The test results are the average of 10 tests and recorded in Table 1.

[0101] 3. Printing stability: After the first continuous printing for 2 hours, print every 12 hours. Abnormal inkjet stability: The ink shows intermittent defects when used in the printhead; No abnormal inkjet stability: The ink does not show intermittent defects when used in the printhead. The printing results are recorded in Table 1.

[0102] 4. Viscosity: Ultra-low viscosity was measured at a constant temperature of 25℃, and the results are recorded in Table 1.

[0103] 5. Hot and cold cycling: Test conditions: 50% constant humidity, high temperature 70℃×4h, low temperature -20℃×4h, continuous 3 sets of cycles for 24h, observe the ink condition. If there is no floating oil, no sedimentation, and no precipitation, it is recorded as qualified. Otherwise, if any condition occurs, it is recorded as unqualified. 50 sets of samples were tested for each example and comparative example, and the pass rate was recorded as shown in Table 1.

[0104] 6. Adhesion: After inkjet printing on absorbable materials, OPP tape is used to adhere the ink and then pulled back and forth to observe the ink droplet lifting effect and whether there is any ink loss on the printed surface. The results are recorded in Table 1.

[0105] 7. Water resistance: After inkjet printing is completed, the ink is evaporated and dried. The ink is then immersed in water at 35°C for 24 hours. The surface changes of the ink droplets are observed to see if there is any color fading, color bleeding, or bubbling. If none of these occur, the ink is considered qualified. Otherwise, if any of these occur, the ink is considered unqualified. 50 samples are tested for each example and comparative example, and the pass rate is recorded as shown in Table 1.

[0106] Table 1 Performance Test Results

[0107]

[0108] Based on the final results of the performance tests, the technical solutions specified in this application adopted in Examples 1 to 3 of this application yielded better performance test results. However, Comparative Examples 1 and 2 did not adopt the raw material ratio technical solution specified in this application, which resulted in a weakening of their combined effect in the ink system, especially a significant weakening of the direct effect of the reinforcing agent, which ultimately led to a significant decline in their corresponding performance test results.

[0109] Comparative Examples 3 to 6, on the other hand, did not use the correct raw material selection and formulation scheme, which directly reduced the effectiveness of the reinforcing agent and polymer dispersion. As a result, they could not effectively maintain the high-precision ink droplet positioning ability, weakened the spreading and adhesion properties, and thus obtained worse performance results.

Claims

1. A high-resolution color inkjet ink, characterized in that: By weight, the raw materials include at least: 60-90 parts of bio-based solvent, 2-12 parts of polymer dispersion, 10-25 parts of auxiliary oiling agent, 5-15 parts of pigment agent, 0.3-1 part of bio-based lubricant, 0.1-0.5 parts of synergist, and 3-8 parts of reinforcing agent; The bio-based solvent is isopropyl lauryl ester or acetylated tributyl citrate; The reinforcing agent is a composition of epoxidized soybean oil acrylate, hydrogenated rosin pentaerythritol ester and polyglycerol ricinoleate, in a mass ratio of (2~3.5):(1~2):(0.8~1.4). The polymer dispersion is at least one of styrene-acrylic acid copolymer ammonium salt, polyhydroxystearic acid derivative, modified castor oil polyol, acrylate-maleic anhydride copolymer, and bio-based polyester dispersion; The bio-based lubricant is at least one of fatty acids, erucamide, polyethylene glycol, sugarcane wax derivatives, and dehydrated sorbitan palmitate; The synergist is any one of the reactive pigment derivatives; The auxiliary oil is a combination of tall oil and castor oil in a mass ratio of (1~2):(1~2).

2. The high-resolution color inkjet ink according to claim 1, characterized in that: The bio-based solvent has a mass ratio of polymer dispersion to reinforcing agent of (65~85):(3~10):(4~6).

3. The high-resolution color inkjet ink according to claim 2, characterized in that: The polymer dispersion is a polyhydroxystearic acid derivative.

4. The high-resolution color inkjet ink according to claim 3, characterized in that: The auxiliary oiling agent is at least one of tall oil, ethyl oleate, octyl / decyl triglyceride and castor oil.

5. The high-resolution color inkjet ink according to claim 4, characterized in that: The pigment is any one of inorganic carbon black pigment, organic blue pigment, organic red pigment, organic purple pigment, and inorganic white pigment.

6. A method for preparing high-resolution color inkjet ink according to any one of claims 1 to 5, characterized in that: S1: Add the bio-based solvent, polymer dispersion, pigment, synergist, and reinforcing agent sequentially to a high-speed disperser for pre-dispersion at 800-1000 rpm for 30-40 min, forming a vortex effect until the powder is uniformly suspended; S2: Grind in a DCP circulating system for 13-15 h at a flow rate of 3-4 kg / min, a grinding pressure of 1.5-2 bar, and a temperature of 30-40℃; S3: Add the remaining raw materials sequentially and mix at 400-600 rpm for 30-35 min to obtain the final product.

Images