A dispersant for high-temperature direct-jet blue disperse dye ink and its application in high-temperature direct-jet blue disperse dye ink

Abstract

The present invention relates to the field of digital inkjet printing inks, and more particularly to a dispersant for high-temperature direct-injection blue disperse dye inks and their application in high-temperature direct-injection blue disperse dye inks. A dispersant for high-temperature direct-injection blue disperse dye inks, wherein the dispersant structure is shown in Formula I: #imgabs0# The main structure of the dispersant obtained by the present invention corresponds to the structure of several high-temperature disperse blue dyes, has a strong binding force with dye molecules, can effectively hinder aggregation of dye molecules, and maintain a stable dispersed state, thereby improving the dispersion performance of the color paste. More importantly, the dispersant of the present invention and the corresponding dye have a very similar conjugated system and similar color. The color difference between the fabric after color fixation and the standard sample dyed fabric is very small, which can meet the color difference requirements of customers for high-end fabrics.

Description

Technical Field

[0001] The present invention relates to the field of digital inkjet printing ink, and in particular to a dispersant for high-temperature direct-jet blue disperse dye ink and an application of the high-temperature direct-jet blue disperse dye ink. Background Art

[0002] In recent years, digital inkjet printing has rapidly developed in textile printing applications. Compared to traditional printing methods, digital inkjet printing offers advantages such as design flexibility, low energy consumption, pollution-free operation, material savings, and high product quality, meeting environmental and application requirements. Inkjet printing ink is a key factor influencing the quality of printed products. Inkjet printing inks for textiles not only have specific requirements for dye purity, insoluble solid particle size, ink viscosity, surface tension, stability, pH, and foaming properties, but also require excellent dyeing properties after the ink is sprayed onto the fabric to form the pattern, including minimal color variation and high color fastness.

[0003] In digital textile printing, high-temperature disperse direct-jet inks offer numerous advantages over the medium- and low-temperature sublimation inks used for thermal transfer printing: 1. High permeability: High-temperature disperse direct-jet inks utilize a direct-jet printing process, spraying the ink directly onto the textile fabric and penetrating it. After steaming and color fixing, the textile fabric achieves a deep color, eliminating the bleaching and whitening issues often seen in thermal transfer printing. 2. Excellent hand feel: Disperse thermal transfer printing processes high temperatures exceeding 200°C, which can leave the fabric feeling stiff after printing. This is especially true for velvety and wrinkled fabrics, where the velvety and wrinkle feel can be reduced or even completely eliminated, impacting the quality of the finished print. High-temperature disperse direct-jet inks utilize steam evaporation, leaving the finished fabric's feel largely unchanged. 3. High color fastness: Disperse thermal transfer dyes are low- and medium-temperature dyes, and their sublimation fastness often fails to meet high-quality requirements. High-temperature disperse dyes, however, offer high sublimation fastness and virtually no secondary sublimation.

[0004] The existing technology of high-temperature dispersed direct-jet ink still has shortcomings: for example, the storage stability cannot meet the requirements. This is because disperse dye ink uses water as a solvent, and disperse dyes themselves are insoluble in water. The existing technology usually uses dispersants to achieve uniform dispersion of dye particles, but the dye particles in this dispersed system are easily affected by the environment such as light and heat, resulting in flocculation or precipitation, that is, poor storage stability, which restricts its application in textile printing and dyeing. Furthermore, poor storage stability affects the jetting stability, resulting in large ink particles clogging the nozzle during printing and inkjet printing. In the textile printing and dyeing industry, the cost of digital ink is also the most concerned. In this field, in order to maintain the particle size obtained after dye grinding, a variety of dispersants are often added in large amounts, which will inevitably increase the cost of ink, or there will be problems such as color difference. Summary of the Invention

[0005] The technical problem solved by the present invention is to solve the dispersion stability performance of direct-jet dispersed ink, and at the same time solve the problem that the dispersant affects the color of the ink system, and provide a dispersant for high-temperature direct-jet blue disperse dye ink and its application in high-temperature direct-jet blue disperse dye ink.

[0006] To achieve the above objectives, the technical solution provided by the present invention is:

[0007] A dispersant for high-temperature direct-injection blue disperse dye ink, characterized in that the dispersant structure is as shown in Formula I:

[0008]

[0009] in,

[0010] R1, R2, R3, R4, R5 may be the same or different and may be selected from H, -NO2, -CN, -Br, -SO3H, -SO2NH2, -SO2H or -COOH;

[0011] R6, R7, R8, R9 may be the same or different and may be selected from H, -OCH3, -OC2H5, -NHCOCH3 or -NHCOC2H5;

[0012] X and Y may be the same or different and may be selected from -C2H5 or -C2H4OCOCH3; and at least one of R1, R2, R3, R4 and R5 may be selected from -SO3H, -SO2NH2, -SO2H or -COOH.

[0013] An application of the dispersant for high-temperature direct-jet blue disperse dye ink, and an application of the dispersant for high-temperature direct-jet blue disperse dye ink in high-temperature direct-jet blue disperse dye ink.

[0014] A high-temperature direct-jet blue disperse ink comprises, by mass percentage, 3-15% of a high-temperature blue disperse dye, 1-15% of a dispersant, 30-60% of an organic solvent, 0.5-2% of a surfactant, 0.05-0.2% of a bactericide, 0.1-0.5% of a defoamer, and the balance being deionized water.

[0015] The high temperature disperse dye includes one or more high temperature disperse blue dyes;

[0016] The organic solvent is one or more of glycerol, isopropyl alcohol, diethylene glycol, thiodiglycol, and ethylene glycol monomethyl ether.

[0017] The surfactant is one or a mixture of Surfynol465, fatty acid polyoxyethylene ether AEO, and TN-6.

[0018] The defoaming agent is one or both of Surfynol-104E and APE-0050.

[0019] The fungicide is one or a mixture of 5-chloro-2-methyl-4-isothiazoline-3-one, 1,6-dihydroxy-2,5-dioxane, and 1,2-benzisothiazolin-3-one fungicides;

[0020] A method for preparing a high-temperature direct-injection blue disperse ink comprises the following steps: mixing a high-temperature disperse dye and a dispersant according to the aforementioned percentage at room temperature, grinding the mixture in a grinder using zirconium beads with a diameter of 0.20-0.35 mm for 8-40 hours to obtain a dispersion; mixing the dispersion, an organic solvent, a surfactant, a bactericide, a defoamer, and deionized water, stirring the mixture at a speed of 2200-2800 r / min for 1-5 hours, and filtering the mixture to obtain the high-temperature disperse direct-injection ink.

[0021] The invention discloses an application of a high-temperature direct-jet dispersed ink, comprising: applying the ink to a digital textile printing machine for direct printing, controlling the working temperature to be 15-35° C. and the working humidity to be 20-80%; drying the printed product, and steaming for color fixation, wherein the steaming temperature is 160-200° C. and the steaming time is 8-12 minutes.

[0022] The advantages of the present invention are:

[0023] The main structure of the dispersant obtained by the present invention corresponds to that of several high-temperature disperse blue dyes. It exhibits strong binding forces with dye molecules, effectively preventing aggregation and maintaining a stable dispersion state, thereby improving the dispersibility of the color paste. More importantly, the dispersant of the present invention and the corresponding dyes have a very similar conjugated system, resulting in similar colors. The color difference between the fixed fabric and the standard dyed fabric is very small, meeting the color difference requirements of customers for high-end fabrics. DETAILED DESCRIPTION

[0024] The following specific examples are provided to further illustrate the present invention, but the present invention is in no way limited to these examples. Various modifications are possible within the scope defined by the claims. The disperse dyes in the examples are commercially available. The homemade dispersant was synthesized using conventional organic synthesis methods. The organic solvent, surfactant, fungicide, defoamer, and deionized water are all commercially available.

[0025] Example 1

[0026] A blue high-temperature direct-jet disperse ink comprises, by mass percentage, 10% high-temperature disperse blue 79 dye, 1% homemade dispersant B-1, 20% organic solvent isopropyl alcohol, 5% organic solvent ethylene glycol monomethyl ether, 0.5% surfactant Surfynol 465, 0.3% surfactant fatty acid polyethylene ether AEO, 0.1% bactericide 1,6-dihydroxy-2,5-dioxane, 0.2% defoaming agent Surfynol 104E, and 62.9% deionized water.

[0027] Example 2

[0028] A blue high-temperature direct-jet disperse ink comprises, by mass percentage, 12% of high-temperature disperse blue 79 dye, 1.2% of a self-made dispersant B-2, 13% of a solvent diethylene glycol, 8.8% of thiodiglycol, 5% of an organic solvent ethylene glycol monomethyl ether, 0.5% of a surfactant TN-6, 0.15% of a fungicide 1,2-benzisothiazolin-3-one, 0.1% of a defoamer APE-0050, and 59.25% of deionized water.

[0029] Example 3

[0030] A blue high-temperature direct-jet disperse ink comprises, by mass percentage, 8% of high-temperature disperse blue 79 dye, 0.8% of a self-made dispersant B-3, 18% of an organic solvent glycerol, 7% of an organic solvent ethylene glycol monomethyl ether, 0.6% of a surfactant Surfynol-104E, 0.1% of a fungicide 5-chloro-2-methyl-4-isothiazoline-3-one, 0.1% of a defoamer APE-0050, and 65.4% of deionized water.

[0031] Example 4

[0032] A blue high-temperature direct-jet disperse ink comprises, by mass percentage, 12% of high-temperature disperse blue 183 dye, 1.2% of dispersant B-4, 13% of organic solvent diethylene glycol, 8.8% of thiodiglycol, 5% of organic solvent ethylene glycol monomethyl ether, 0.5% of surfactant Surfynol 465, 0.3% of surfactant TN-6, 0.1% of fungicide 1.2-benzisothiazolin-3-one, 0.2% of defoamer APE-0050, and 58.9% of deionized water.

[0033] Example 5

[0034] A blue high-temperature direct-jet disperse ink comprises, by mass percentage, 8% of high-temperature disperse blue 183 dye, 1% of dispersant B-5, 25% of organic solvent glycerol, 5% of organic solvent ethylene glycol monomethyl ether, 0.5% of surfactant Surfynol 465, 0.3% of surfactant TN-6, 0.2% of surfactant fatty acid polyoxyethylene ether AEO, 0.1% of TN-6 fungicide 1,2-benzisothiazolin-3-one, 0.2% of defoamer APE-0050, and 59.7% of deionized water.

[0035] Example 6

[0036] A blue high-temperature direct-jet disperse ink comprises, by mass percentage, 10% of high-temperature disperse blue 183 dye, 1.2% of dispersant B-6, 13% of organic solvent diethylene glycol, 8.8% of isopropyl alcohol, 5% of organic solvent ethylene glycol monomethyl ether, 0.5% of surfactant Surfynol 465, 0.3% of surfactant TN-6, 0.1% of fungicide 1.2-benzisothiazolin-3-one, 0.2% of defoamer APE-0050, and 60.9% of deionized water.

[0037] Example 7

[0038] A blue high-temperature direct-jet disperse ink comprises, by mass percentage, 10% of high-temperature disperse blue 291 dye, 0.9% of dispersant B-7, 12% of organic solvent diethylene glycol, 9.8% of isopropyl alcohol, 5.5% of organic solvent ethylene glycol monomethyl ether, 0.5% of surfactant Surfynol 465, 0.3% of surfactant TN-6, 0.1% of fungicide 1.2-benzisothiazolin-3-one, 0.2% of defoamer APE-0050, and 60.7% of deionized water.

[0039] Example 8

[0040] A blue high-temperature direct-jet disperse ink comprises, by mass percentage, 12% of high-temperature disperse blue 183 dye, 1.2% of dispersant B-8, 25% of organic solvent glycerol, 5% of organic solvent ethylene glycol monomethyl ether, 0.5% of surfactant Surfynol 465, 0.3% of surfactant TN-6, 0.2% of surfactant fatty acid polyoxyethylene ether AEO, 0.1% of TN-6 fungicide 1.2-benzisothiazolin-3-one, 0.2% of defoamer APE-0050, and 55.5% of deionized water.

[0041] Example 9

[0042] A blue high-temperature direct-jet disperse ink comprises, by mass percentage, 8% of high-temperature disperse blue 183 dye, 1.2% of dispersant B-9, 13% of organic solvent diethylene glycol, 8.8% of isopropyl alcohol, 5% of organic solvent ethylene glycol monomethyl ether, 0.5% of surfactant Surfynol 465, 0.3% of surfactant TN-6, 0.1% of fungicide 1.2-benzisothiazolin-3-one, 0.2% of defoamer APE-0050, and 60.9% of deionized water.

[0043] Examples 10 to 12

[0044] In Examples 1 to 3, the structures of dispersants B-1, B-2, and B-3 are as follows:

[0045]

[0046] Dispersant B-1 was synthesized as follows: 4-amino-3-bromo-5-nitrobenzoic acid (reagent grade, Chongqing Futeng Pharmaceutical Chemical Co., Ltd.) was diazotized with dilute hydrochloric acid and sodium nitrite and reacted with the coupling component of Disperse Blue 79 to obtain Dispersant B-1 with a chromatographic content of 95% and a yield of 78%. 1 H NMR(500MHz,Chloroform-d)δ9.54(s,1H),8.41(s,1H),8.15(s,1H),7.66(d,J=7.2Hz,1H),7. 47(d,J=1.9Hz,1H), 6.65(dd,J=7.2,1.9Hz,1H), 3.49(q,J=7.1Hz,4H), 1.16(t,J=7.0Hz,6H).

[0047] Dispersant B-2 was synthesized as follows: 4-amino-3-bromo-5-nitrobenzenesulfonamide (reagent grade, HK Chemhere) was diazotized with dilute hydrochloric acid and sodium nitrite and reacted with the coupling component of Disperse Blue 79 to obtain Dispersant B-2 with a chromatographic content of 96% and a yield of 80%. 1 H NMR(500MHz,Chloroform-d)δ9.55(s,1H),8.80(d,J=2.2Hz,1H),8.31(d,J=2.2Hz,1H),7.37(d,J=9.3Hz,1H),7.31(d,J=9.3Hz,1H ),7.28(s,1H),7.24(s,1H),4.33(t,J=6.1Hz,4H),4.12(q,J=6.3Hz,2H),3.53(t,J=6.1Hz,4H),2.22(s,2H),1.42(t,J=6.3Hz,3H).

[0048] Dispersant B-3 was synthesized as follows: 4-amino-3-bromo-5-cyanobenzoic acid (reagent grade, Changzhou Harui Chemical Co., Ltd.) was diazotized with dilute hydrochloric acid and sodium nitrite and reacted with the coupling component of Disperse Blue 79 to obtain Dispersant B-3 with a chromatographic content of 95% and a yield of 82%. 1 H NMR(500MHz,Chloroform-d)δ9.55(s,1H),8.69(dd,J=13.4,2.2Hz,2H),7.33(s,1H),7.24(s,1H),4. 33(t,J=6.1Hz,4H),4.12(q,J=6.3Hz,2H),3.53(t,J=6.1Hz,4H),2.22(s,2H),1.42(t,J=6.3Hz,3H).

[0049] Preparation method of dye ink: Dye disperse blue 79, dispersant, organic solvent, surfactant, defoamer and deionized water are mixed uniformly according to the formulas in Examples 1 to 3, and ground in a grinder until the dye particles are less than 0.5 μm to prepare a disperse dye dispersion liquid, and then a fungicide is added and mixed uniformly to obtain blue ink.

[0050] Examples 13 to 15

[0051] In Examples 4 to 6, the structures of dispersants B-4, B-5, and B-6 are as follows:

[0052]

[0053] Dispersant B-4 was synthesized as follows: 4-amino-3-bromo-5-cyanobenzenesulfonamide (reagent grade, HK Chemhere) was diazotized with dilute hydrochloric acid and sodium nitrite and reacted with the coupling component of Disperse Blue 183 to obtain Dispersant B-4 with a chromatographic content of 96% and a yield of 81%. 1 H NMR(500MHz,Chloroform-d)δ9.54(s,1H),8.39(d,J=2.0Hz,1H),8.31(d,J=2.2Hz,1H),7.66(d,J=7.3Hz,1H),7.48(d,J=1.9H z,1H),7.31(d,J=9.1Hz,1H),7.23(d,J=9.3Hz,1H),6.65(dd,J=7.2,1.9Hz,1H),3.49(q,J=7.1Hz,4H),1.16(t,J=7.0Hz,6H).

[0054] Dispersant B-5 was synthesized as follows: 4-amino-3-bromo-5-cyanobenzoic acid (reagent grade, Changzhou Harui Chemical Co., Ltd.) was diazotized with dilute hydrochloric acid and sodium nitrite and reacted with the coupling component of Disperse Blue 183 to obtain Dispersant B5 with a chromatographic content of 95% and a yield of 81%. 1 H NMR(500MHz,Chloroform-d)δ9.54(s,1H),8.37(d,J=2.0Hz,1H),8.33(d,J=2.2Hz,1H),7.66(d,J=7.3H z,1H),7.48(d,J=1.9Hz,1H),6.65(dd,J=7.2,1.9Hz,1H),3.49(q,J=7.1Hz,4H),1.16(t,J=7.0Hz,6H).

[0055] Dispersant B-6 was synthesized as follows: 4-amino-3-bromo-5-nitrobenzoic acid (reagent grade, Chongqing Futeng Pharmaceutical Chemical Co., Ltd.) was diazotized with dilute hydrochloric acid and sodium nitrite and reacted with the coupling component of Disperse Blue 183 to obtain Dispersant B1 with a chromatographic content of 95% and a yield of 80%. 1 H NMR(500MHz,Chloroform-d)δ9.54(s,1H),8.41(s,1H),8.15(s,1H),7.66(d,J=7.2Hz,1H),7. 47(d,J=1.9Hz,1H), 6.65(dd,J=7.2,1.9Hz,1H), 3.49(q,J=7.1Hz,4H), 1.16(t,J=7.0Hz,6H).

[0056] Preparation method of dye ink: Dye disperse blue 183, dispersant, organic solvent, surfactant, defoamer and deionized water are mixed uniformly according to the formulas in Examples 4 to 6, and ground in a grinder until the dye particles are less than 0.5 μm to prepare a disperse dye dispersion liquid, and then a fungicide is added and mixed uniformly to obtain blue ink.

[0057] Examples 16 to 18

[0058] In Examples 7 to 9, the structures of dispersants B-7, B-8, and B-9 are as follows:

[0059]

[0060] Dispersant B-7 was synthesized as follows: 4-amino-3-bromo-5-cyanobenzoic acid (reagent grade, Changzhou Harui Chemical Co., Ltd.) was diazotized with dilute hydrochloric acid and sodium nitrite and reacted with the coupling component of Disperse Blue 291 to obtain Dispersant B7 with a chromatographic content of 95% and a yield of 82%. 1H NMR(500MHz,Chloroform-d)δ9.55(s,1H),8.37(d,J=2.0Hz,1H),8.33(d,J=2.2Hz,1H ),7.43(s,1H),7.33(s,1H),3.89(s,2H),3.45(q,J=7.0Hz,4H),1.12(t,J=7.0Hz,6H).

[0061] Dispersant B-8 was synthesized as follows: 4-amino-3-bromo-5-cyanobenzenesulfonamide (reagent grade, HK Chemhere) was diazotized with dilute hydrochloric acid and sodium nitrite and reacted with the coupling component of Disperse Blue 291 to obtain Dispersant B7 with a chromatographic content of 96% and a yield of 81%. 1 H NMR(500MHz,Chloroform-d)δ9.55(s,1H),8.39(d,J=2.0Hz,1H),8.31(d,J=2.2Hz,1H),7.43(s ,1H),7.35–7.28(m,2H),7.24(s,1H),3.89(s,2H),3.45(q,J=7.0Hz,4H),1.12(t,J=7.0Hz,6H).

[0062] Dispersant B-9 was synthesized as follows: 4-amino-3-bromo-5-cyanobenzoic acid (reagent grade, Changzhou Harui Chemical Co., Ltd.) was diazotized with dilute hydrochloric acid and sodium nitrite and reacted with the coupling component of Disperse Blue 291 to obtain Dispersant B7 with a chromatographic content of 95% and a yield of 82%. 1 H NMR(500MHz,Chloroform-d)δ9.55(s,1H),8.69(dd,J=13.4,2.2Hz,2H),7.43( s,1H),7.38(s,1H),3.89(s,2H),3.45(q,J=7.0Hz,4H),1.12(t,J=7.0Hz,6H).

[0063] Preparation method of dye ink: Dye disperse blue 291, dispersant, organic solvent, surfactant, defoamer and deionized water are mixed uniformly according to the formula in Examples 7 to 9, and ground in a grinder until the dye particles are less than 0.5 μm to prepare a disperse dye dispersion liquid, and then a fungicide is added and mixed uniformly to obtain blue ink.

[0064] Comparative Example 1

[0065] The blue ink was prepared according to the preparation method in Example 1 of patent CN113914116A.

[0066] Comparative Example 2

[0067] The disperse dye CI Disperse Blue 79 used in Comparative Example 1 was replaced with an equal mass of CI Disperse Blue 183.

[0068] Comparative Example 3

[0069] The disperse dye CI Disperse Blue 79 used in Comparative Example 2 was replaced with an equal mass of CI Disperse Blue 291.

[0070] The following performance indicators were measured at room temperature for the disperse dye inks of Examples 1-3 of the present invention.

[0071] 1. Measurement indicators and methods

[0072] a) Particle size: Dilute the disperse dye paste with deionized water to a certain multiple, and measure the particle size of the dye in the dispersed system using a nanoparticle size distribution analyzer at 25°C.

[0073] b) Viscosity: The viscosity of the ink was measured at 25°C using a rotational viscometer with a No. 0 rotor (torque of 50%).

[0074] c) pH: Measure the pH of the ink at 25°C using an EL-20 pH meter. Test each sample three times and take the average value. d) Redispersibility: Use a visible light spectrophotometer to measure the ABS value at the maximum absorption peak of the ink, recorded as ABS1. Place 20g of ink in a 100ml glass beaker, open in a 40°C oven for 48 hours, weigh the dried solution, then add high-purity water to the original weight. Stir with a magnetic stirrer for 30 minutes. Filter out any unredispersed dried ink using a 10µm syringe filter. Then, use a visible light spectrophotometer to measure the ABS value at the maximum absorption peak of the redispersed ink solution, recorded as ABS2. Ink redispersibility = ABS2 / ABS1*100%.

[0075] 2. Thermal storage stability test method

[0076] The disperse dye inks described in Examples 1-9 and Comparative Examples 1-3 were sealed and left to stand in an electric blast drying oven at 60° C. for 14 days. The performance indicators a to d of the disperse dye inks were then measured again using the above method. The measurement results are shown in Table 2 below:

[0077] 3. Dyeing performance test method

[0078] The color data was tested according to the national standard GB / T2374-2017 method and compared with the disperse commercial dye standard. The concentrations of the examples and comparative examples were adjusted to be consistent with the standard sample concentrations by spectrophotometry. An EPSON L310 printer and sized polyester cloth were used to print pure color blocks with the blue ink in the examples and comparative examples. After steam coloring, the color difference was tested.

[0079] The above performance test results are shown in Table 1, Table 2 and Table 3.

[0080] Table 1 Physical and chemical properties test results

[0081]

[0082] Table 2. Thermal storage stability performance test results

[0083]

[0084] Table 3. Dyeing performance test results

[0085]

[0086] Comparing the data in Table 1, Table 2 and Table 3, we can see that:

[0087] (1) The disperse dye inks described in Examples 1-9 showed similar viscosity, pH, and dispersion values to those of the comparative examples, and all exhibited good redispersibility. The particle size values of Examples 1-9 were slightly smaller than those of Comparative Examples 1-3, indicating that the dispersion properties of Examples 1-9 were superior to those of Comparative Examples 1-3.

[0088] (2) After thermal storage, the particle size performance indexes of Examples 1-9 did not change much from the initial measured particle size indexes, indicating that the disperse dye inks described in Examples 1-9 of the present invention had good thermal storage stability and had good dispersion stability compared with Comparative Examples 1-3;

[0089] (3) In terms of dyeing performance, the color difference values ΔE between Examples 1 to 3 and the standard sample were all less than 1, and significantly smaller than the color difference value between Comparative Example 1 and the standard sample. Similarly, the color difference values ΔE between Examples 4 to 6 and the standard sample were all less than 1, significantly smaller than Comparative Example 2, and the color difference values ΔE between Examples 7 to 9 and the standard sample were all less than 1, significantly smaller than Comparative Example 3. Compared with the comparative examples, the dispersant of the present invention reduced the color difference value with the dye in terms of dyeing performance, making the color of the ink-dyed fabric sample closer to that of the dye.

Claims

1. Application of a dispersant for high-temperature direct-injection blue disperse dye ink, characterized in that: Application of the dispersant for high-temperature direct-injection blue disperse dye ink in high-temperature direct-injection blue disperse dye ink; The dispersant structure of the high-temperature direct-jet blue disperse dye ink is shown in Formula I: Formula I; in, R1, R2, R3, R4, R5 may be the same or different and may be selected from H, -NO2, -CN, -Br, -SO3H, -SO2NH2 or -COOH; R6, R7, R8, R9 may be the same or different and may be selected from H, -OCH3, -OC2H5, -NHCOCH3 or -NHCOC2H5; X and Y may be the same or different and may be selected from -C2H5 or -C2H4OCOCH3; and at least one of R1, R2, R3, R4, and R5 may be selected from -SO3H, -SO2NH2 or -COOH.

2. A high-temperature direct-injection blue disperse ink, characterized in that: Calculated by mass percentage, the high-temperature blue disperse dye is 3-15%, the dispersant according to claim 1 is 1-15%, the organic solvent is 30-60%, the surfactant is 0.5-2%, the fungicide is 0.05-0.2%, the defoamer is 0.1-0.5%, and the balance is deionized water.

3. The high-temperature direct-injection blue disperse ink according to claim 2, characterized in that: The high temperature blue disperse dye includes one or more high temperature disperse blue dyes; The organic solvent is one or more of glycerol, isopropyl alcohol, diethylene glycol, thiodiglycol, and ethylene glycol monomethyl ether.

4. The high-temperature direct-injection blue disperse ink according to claim 2, characterized in that: The surfactant is one or both of Surfynol 465 and fatty acid polyoxyethylene ether AEO.

5. The high-temperature direct-injection blue disperse ink according to claim 2, characterized in that: The defoaming agent is Surfynol-104E.

6. The high-temperature direct-injection blue disperse ink according to claim 2, characterized in that: The bactericide is one or a mixture of 5-chloro-2-methyl-4-isothiazoline-3-one, 1,6-dihydroxy-2,5-dioxane and 1,2-benzisothiazolin-3-one bactericides.

7. A method for preparing a high-temperature direct-injection blue disperse ink according to claim 2, characterized in that: At room temperature, a high-temperature blue disperse dye and the dispersant according to claim 1 are mixed and ground in a grinder using zirconium beads with a diameter of 0.20-0.35 mm for 8-40 hours to obtain a dispersion; the dispersion, an organic solvent, a surfactant, a bactericide, a defoamer, and deionized water are mixed and stirred at a speed of 2200-2800 r / min for 1-5 hours. After filtering, the filtrate is a high-temperature direct-injection blue disperse ink.

8. An application of the high-temperature direct-injection blue disperse ink according to claim 2, characterized in that: include: High-temperature direct-jet blue disperse ink is applied to a digital textile printing machine for direct printing, and the operating temperature and humidity are controlled at 15-35°C and 20-80%. The printed product is dried and steamed for color fixation at a temperature of 160-200°C and a steaming time of 8-12 minutes.

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