Online sizing active digital printing paste and preparation method thereof

Abstract

The invention discloses an online sizing active digital printing paste and a preparation method thereof. The preparation method comprises the following steps: (1) adding hydroxyethyl cellulose into water, stirring to prepare a hydroxyethyl cellulose solution, then adding a nonionic surfactant, and stirring for 25-35 minutes; adding dimethyl silicone oil, uniformly emulsifying, adding water, continuously stirring, and stopping stirring when the viscosity reaches stable viscosity, so as to obtain O / W type emulsified paste with the viscosity of 12000-45000 cps; wherein the O / W type emulsion paste contains the following components in parts by weight: 30 parts of dimethyl silicone oil, 1-5 parts of hydroxyethyl cellulose and 4-5 parts of a nonionic surfactant; and (2) mixing and stirring the O / W type emulsion paste and a polyethylene glycol aqueous solution to obtain the printing paste. The printing paste disclosed by the invention has super-strong water holding property, relatively low permeability and relatively high surface color yield, and when the printing paste is applied to on-line sizing active digital printing, the definition of a printing contour is good.

Description

Technical Field

[0001] The invention relates to the field of textile digital printing, and in particular to an online sizing active digital printing paste and a preparation method thereof. Background Art

[0002] Currently, there are two digital printing processes. One involves applying sizing to the fabric through padding, followed by drying and rolling, and finally digital inkjet printing, known as "dry-slurry digital printing." This process is cumbersome, inefficient, and costly, increasingly failing to meet market demand in recent years. With the development and application of artificial intelligence (AI), a second printing process has been developed in the past two years. This involves applying sizing to the fabric through a rotary screen roller, followed by inkjet printing directly onto the wet slurry. This process, known as "online sizing digital printing," simplifies the process and significantly improves production efficiency.

[0003] Because dry-pulp digital printing is printed on dried, pre-sizing fabrics, the printed patterns are clear, lifelike, and colorful, and the water-retention requirements of the printing paste are not too high. However, in the online sizing digital printing process, the ink is printed on the wet slurry during high-speed inkjet printing. How to maintain the clarity of the pattern when printing on the wet slurry is one of the core issues that need to be solved. In addition, it is necessary to prevent ink from penetrating during the printing process, and to try to allow the ink to penetrate into the fiber during the subsequent evaporation process to ensure the surface color rate. Obviously, dry-pulp digital printing paste cannot meet the requirements of online sizing digital printing, and there is still no better online sizing digital printing paste solution on the market. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the purpose of the present invention is to provide a method for preparing an online sizing active digital printing paste. The prepared printing paste has super strong water-holding capacity, low permeability, and high surface color yield. When used for online sizing active digital printing, the printing contour clarity is good.

[0005] Another object of the present invention is to provide an online sizing reactive digital printing paste.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The present invention provides a method for preparing an online sizing reactive digital printing paste, comprising the following steps:

[0008] (1) Preparation of O / W emulsified paste:

[0009] Add hydroxyethyl cellulose to water and stir to form a hydroxyethyl cellulose solution, then add a nonionic surfactant and stir at 250-350 rpm for 25-35 minutes; add dimethyl silicone oil at a stirring speed of 900-1100 rpm, add water after emulsification and continue stirring at 900-1100 rpm. Stop stirring when the viscosity reaches a stable viscosity to obtain an O / W emulsified paste with a viscosity of 12,000-45,000 cps;

[0010] Wherein, the O / W type emulsified paste contains 30 parts of dimethyl silicone oil, 1 to 5 parts of hydroxyethyl cellulose, and 4 to 5 parts of nonionic surfactant, in parts by weight;

[0011] (2) Preparation of printing paste:

[0012] The O / W emulsified paste prepared in step (1) is mixed with a polyethylene glycol aqueous solution and stirred to obtain an online sizing reactive digital printing paste with a viscosity of 16,000 to 50,000 cps.

[0013] Preferably, the polyethylene glycol aqueous solution is prepared by adding polyethylene glycol powder to water at a temperature of 60 to 80° C. to prepare a polyethylene glycol aqueous solution with a mass concentration of 2 to 3 wt %.

[0014] Preferably, the mass ratio of the polyethylene glycol aqueous solution to the O / W emulsified paste is 1:1 to 9:1.

[0015] Preferably, the O / W emulsified paste contains 2 to 4 parts of hydroxyethyl cellulose; and the viscosity of the O / W emulsified paste is 12,000 to 32,000 cps.

[0016] Preferably, the polyethylene glycol powder is PEG6000 powder.

[0017] Preferably, the hydroxyethyl cellulose solution is prepared as follows: 1-5 parts of hydroxyethyl cellulose are added to 300 parts of water at a temperature of 0-50° C. and stirred at 250-350 rpm for 25-35 minutes.

[0018] Preferably, the stirring in step (2) is specifically: stirring at a speed of 250 to 350 rpm for 8 to 12 minutes.

[0019] Preferably, the nonionic surfactant is any one of fatty alcohol polyoxyethylene ether (AEO9) and polysorbate 80 (Tween 80).

[0020] Preferably, the O / W emulsified paste in step (1) contains 60-64 parts by weight of water.

[0021] The present invention also provides an online sizing active digital printing paste, which is composed of an O / W type emulsified paste and a polyethylene glycol aqueous solution;

[0022] In parts by weight, the O / W emulsified paste contains 30 parts of dimethyl silicone oil, 1-5 parts of hydroxyethyl cellulose, 4-5 parts of nonionic surfactant, and 60-64 parts of water;

[0023] The mass concentration of the polyethylene glycol aqueous solution is 2 to 3 wt%;

[0024] The viscosity of the online sizing reactive digital printing paste is 16,000 to 50,000 cps.

[0025] Preferably, the viscosity of the PEG6000 aqueous solution is 32000 cps; the viscosity of the dimethyl silicone oil is in the range of 5-1000 cps.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] (1) The method for preparing the online sizing active digital printing paste of the present invention has the advantages of super strong water holding capacity, low permeability, and high surface color yield. When applied to online sizing active digital printing, the printing contour clarity is good, meeting the performance requirements of online sizing active digital printing.

[0028] (2) The online sizing active digital printing paste of the present invention significantly reduces the permeability of ink, prevents the penetration of ink during the printing process, ensures that the ink only penetrates into the fiber during the evaporation process, and maximizes the guarantee that a smaller amount of ink produces a larger surface color yield, thereby saving more than 50% of ink use and reducing application costs.

[0029] (3) The online sizing active digital printing paste of the present invention significantly improves the water-holding performance of the paste. The super strong water-holding property enables the ink to be printed on the wet paste during high-speed inkjet printing while still maintaining the clarity of the pattern, thus achieving the goal of completing online sizing and online printing at one time. Compared with traditional dry-paste printing digital printing, the production efficiency is increased by more than 2 times. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0031] In the following examples, all reagents used were commercially available unless otherwise specified. PEG6000, AEO9, and Tween-80 were purchased from Jiangsu Haianshi Co., Ltd.; and hydroxyethyl cellulose was purchased from Shandong Heda Co., Ltd.

[0032] Example 1

[0033] Step 1: Prepare O / W emulsified paste:

[0034] The O / W emulsified paste of this embodiment contains, by weight, 30 parts of dimethyl silicone oil, 1 to 5 parts of hydroxyethyl cellulose, 5 parts of nonionic surfactant, and 60-64 parts of water.

[0035] At a temperature of 25°C, 0, 1, 2, 3, 4, and 5 parts of hydroxyethyl cellulose (corresponding to materials 0#, 1#, 2#, 3#, 4#, and 5#, respectively) were added to 30 parts of water and stirred at 300 rpm for 30 minutes. Then, 5 parts of fatty alcohol polyoxyethylene ether (AEO9) were added and stirred for 10 minutes. When the color of the emulsion changed from transparent to milky white, the number of revolutions was increased to 1000 rpm, and 30 parts of dimethyl silicone oil (oil phase) were slowly added at a speed of 10 L / min while stirring. After emulsification, the remaining 35 parts of water, 34 parts of water, 33 parts of water, 32 parts of water, 31 parts of water, and 30 parts of water (corresponding to materials 0#, 1#, 2#, 3#, 4#, and 5#, respectively) were added. When the viscosity of the emulsified paste reached a stable viscosity, stirring was stopped, and the O / W type emulsified paste was prepared for use.

[0036] Table 1 shows the test data and effects of varying hydroxyethyl cellulose addition levels in the O / W emulsion paste prepared in this example. Combined with the online sizing reactive digital printing process, O / W emulsion pastes 2#, 3#, and 4# exhibited reasonable viscosity, appropriate rheological properties, and excellent water retention. As preferred solutions, 3# and 4# were more preferred.

[0037] Step 2: Prepare PEG6000 aqueous solution:

[0038] The PEG6000 aqueous solution of the present invention is composed of the following components in parts by weight: 2 parts of PEG6000 and 98 parts of tap water (heated to 70° C.).

[0039] The above components were prepared as follows: 2 parts of PEG6000 powder were slowly added to 98 parts of hot water (70°C), stirred at 300 rpm for 10 minutes, and then increased to 1000 rpm until the solution was completely expanded and dissolved. The viscosity of the PEG6000 aqueous solution was 32000 cps and the PVI value (printing viscosity index) was 0.32. It was set aside.

[0040] Step 3: Mixing: Mix 1 part of the PEG6000 aqueous solution prepared in the second step and 99 parts of the O / W emulsified paste 3# prepared in the first step, and stir at 300 rpm for 10 minutes. When the viscosity is constant and the appearance is delicate, the online sizing active digital printing composite paste is obtained and the preparation is completed.

[0041] The online sizing reactive digital printing composite paste prepared in this example showed no oily appearance or demulsification after being statically stored at room temperature for 30 days, and its viscosity remained constant. The test conditions were: Brookfield-LVT230 viscometer, 25°C, rotor #4, 12 RPM; 16,000 cps; and a PVI (print viscosity index) of 0.58, demonstrating the excellent stability of the online sizing reactive digital printing composite paste in this example.

[0042] Example 2

[0043] Step 1: Prepare O / W emulsified paste: the formula and preparation process are the same as those of O / W emulsified paste 3# in Example 1.

[0044] Step 2: Preparation of PEG6000 aqueous solution: the formula and preparation process are the same as those in Example 1.

[0045] Step 3: Mixing: Mix 30 parts of the PEG6000 aqueous solution prepared in the second step and 70 parts of the O / W emulsified paste 3# prepared in the first step, and stir at 300 rpm for 10 minutes. When the viscosity is constant and the appearance is delicate, the online sizing active digital printing composite paste is obtained and the preparation is completed.

[0046] After 30 days of static storage at room temperature, the online sizing reactive digital printing composite paste of this example showed no oily appearance or demulsification, and maintained constant viscosity. Test conditions were: Brookfield-LVT230 viscometer, 25°C, rotor #4, 12 RPM: 26,000 cps, and a PVI (Printing Viscosity Index) of 0.52, demonstrating the excellent stability of the online sizing reactive digital printing composite paste of this example.

[0047] Example 3

[0048] Step 1: Prepare O / W emulsified paste: the formula and preparation process are the same as those of O / W emulsified paste 3# in Example 1.

[0049] Step 2: Preparation of PEG6000 aqueous solution: the formula and preparation process are the same as those in Example 1.

[0050] Step 3: Mixing: Mix 50 parts of the PEG6000 aqueous solution prepared in the second step and 50 parts of the O / W emulsified paste 3# prepared in the first step, stir at 300 rpm for 10 minutes, and when the viscosity is constant and the appearance is delicate, the online sizing active digital printing composite paste is obtained and the preparation is completed. After the online sizing active digital printing composite paste of this embodiment was placed statically at room temperature for 30 days, there was no oil floating or demulsification in the appearance, and the viscosity was constant. Among them, the test conditions are: BROOKFIELD-LVT230 viscometer, 25 ° C, rotor No. 4 12RPM): 30000cps, PVI (printing viscosity index) value is 0.50, indicating that the online sizing active digital printing composite paste of this embodiment has good stability.

[0051] Example 4

[0052] Step 1: Prepare O / W emulsified paste: the formula and preparation process are the same as those of O / W emulsified paste 3# in Example 1.

[0053] Step 2: Preparation of PEG6000 aqueous solution: the formula and preparation process are the same as those in Example 1.

[0054] Step 3: Mixing: Mix 70 parts of the PEG6000 aqueous solution prepared in the second step and 30 parts of the O / W emulsified paste 3# prepared in the first step, stir at 300 rpm for 10 minutes, and when the viscosity is constant and the appearance is delicate, the online sizing active digital printing composite paste is obtained and the preparation is completed. After the online sizing active digital printing composite paste of this embodiment was placed statically at room temperature for 30 days, there was no oil floating or demulsification in the appearance, and the viscosity was constant. Among them, the test conditions are: BROOKFIELD-LVT230 viscometer, 25 ° C, rotor No. 4 12RPM): 38000cps, PVI (printing viscosity index) value is 0.42, indicating that the online sizing active digital printing composite paste of this embodiment has good stability.

[0055] Example 5

[0056] Step 1: Prepare O / W emulsified paste: the formula and preparation process are the same as those of O / W emulsified paste 3# in Example 1.

[0057] Step 2: Preparation of PEG6000 aqueous solution: the formula and preparation process are the same as those in Example 1.

[0058] Third step: mixing: mix the PEG6000 aqueous solution prepared in the second step 90 parts and the O / W emulsion paste 4# prepared in the first step 10 parts, stir at 300 rpm for 10 minutes, until the viscosity is constant and the appearance is fine, and then the online sizing active digital printing composite paste is obtained. The online sizing active digital printing composite paste of this example was statically placed at room temperature for 30 days, and no oil floating and demulsification phenomenon occurred, and the viscosity was constant. The test conditions were: BROOKFIELD-LVT230 viscometer, 25°C, No. 4 rotor 12 RPM: 45000 cps, PVI (printing viscosity index) value was 0.32, which indicated that the online sizing active digital printing composite paste of this example had good stability.

[0059] Example 6

[0060] First step: preparation of O / W emulsion paste: the formula and preparation process are the same as O / W emulsion paste 4# in Example 1.

[0061] Second step: preparation of PEG6000 aqueous solution: the formula and preparation process are the same as in Example 1.

[0062] Third step: mixing: mix the PEG6000 aqueous solution prepared in the second step 1 part and the O / W emulsion paste 4# prepared in the first step 99 parts, stir at 300 rpm for 10 minutes, until the viscosity is constant and the appearance is fine, and then the online sizing active digital printing composite paste is obtained.

[0063] The online sizing active digital printing composite paste of this example was statically placed at room temperature for 30 days, and no oil floating and demulsification phenomenon occurred, and the viscosity was constant. The test conditions were: BROOKFIELD-LVT230 viscometer, 25°C, No. 4 rotor 12 RPM: 18000 cps, PVI (printing viscosity index) value was 0.56, which indicated that the online sizing active digital printing composite paste of this example had good stability.

[0064] Example 7

[0065] First step: preparation of O / W emulsion paste: the formula and preparation process are the same as O / W emulsion paste 4# in Example 1.

[0066] Second step: preparation of PEG6000 aqueous solution: the formula and preparation process are the same as in Example 1.

[0067] Step 3: Mixing: Mix 30 parts of the PEG6000 aqueous solution from the second step with 70 parts of the preferred O / W emulsified paste 4# from the first step, stir at 300 rpm for 10 minutes, and when the viscosity is constant and the appearance is delicate, the online sizing active digital printing composite paste is obtained and the preparation is completed. After the online sizing active digital printing composite paste of this embodiment was placed statically at room temperature for 30 days, there was no oil floating or demulsification in the appearance, and the viscosity was constant. The test conditions are: BROOKFIELD-LVT230 viscometer, 25°C, rotor No. 4 12RPM): 28000cps, PVI (printing viscosity index) value is 0.50, indicating that the online sizing active digital printing composite paste of this embodiment has good stability.

[0068] Example 8

[0069] Step 1: Prepare O / W emulsified paste: the formula and preparation process are the same as those of O / W emulsified paste 4# in Example 1.

[0070] Step 2: Preparation of PEG6000 aqueous solution: the formula and preparation process are the same as those in Example 1.

[0071] Step 3: Mixing: Mix 50 parts of the PEG6000 aqueous solution prepared in Step 2 with 50 parts of the O / W emulsified paste #4 prepared in Step 1. Stir at 300 rpm for 10 minutes. When the viscosity remains constant and the appearance is smooth, the online sizing active digital printing composite paste is obtained. After 30 days of static storage at room temperature, the online sizing active digital printing composite paste of this example shows no oily appearance or demulsification, and its viscosity remains constant. (Test conditions: Brookfield-LVT230 viscometer, 25°C, rotor 4, 12 RPM): 32,000 cps, and a PVI (print viscosity index) value of 0.48, indicating that the online sizing active digital printing composite paste of this example has good stability.

[0072] Example 9

[0073] Step 1: Prepare O / W emulsified paste: the formula and preparation process are the same as those of O / W emulsified paste 4# in Example 1.

[0074] Step 2: Preparation of PEG6000 aqueous solution: the formula and preparation process are the same as those in Example 1.

[0075] Step 3: Mixing: Mix 70 parts of the PEG6000 aqueous solution prepared in the second step and 30 parts of the O / W emulsified paste 4# prepared in the first step, stir at 300 rpm for 10 minutes, and when the viscosity is constant and the appearance is delicate, the online sizing active digital printing composite paste is obtained and the preparation is completed. After the online sizing active digital printing composite paste of this embodiment was placed statically at room temperature for 30 days, there was no oil floating or demulsification in the appearance, and the viscosity was constant. Among them, the test conditions are: BROOKFIELD-LVT230 viscometer, 25 ° C, rotor No. 4 12RPM): 42000cps, PVI (printing viscosity index) value is 0.42, indicating that the online sizing active digital printing composite paste of this embodiment has good stability.

[0076] Example 10

[0077] Step 1: Prepare O / W emulsified paste: the formula and preparation process are the same as those of O / W emulsified paste 4# in Example 1.

[0078] Step 2: Preparation of PEG6000 aqueous solution: the formula and preparation process are the same as those in Example 1.

[0079] Step 3: Mixing: Mix 90 parts of the PEG6000 aqueous solution prepared in the second step and 10 parts of the O / W emulsified paste 4# prepared in the first step, stir at 300 rpm for 10 minutes, and when the viscosity is constant and the appearance is delicate, the online sizing active digital printing composite paste is obtained and the preparation is completed. After the online sizing active digital printing composite paste of this embodiment was placed statically at room temperature for 30 days, there was no oil floating or demulsification in the appearance, and the viscosity was constant. Among them, the test conditions are: BROOKFIELD-LVT230 viscometer, 25 ° C, rotor No. 4 12RPM): 50000cps, PVI (printing viscosity index) value is 0.28, indicating that the online sizing active digital printing composite paste of this embodiment has good stability.

[0080] The online sizing reactive digital printing composite paste prepared in the above embodiment was used for online sizing reactive digital printing, wherein the process parameters were set as follows:

[0081] 1. For online digital printing sizing, select 155 mesh for rotary screen, 20mm for magnetic rod, 70N for magnetic force, and 80 yards / min for printing speed.

[0082] 2. Steaming process setting: 102℃*8min.

[0083] 3. Washing process settings: The first 3 tanks are desizing tanks, the middle 4 tanks are 80℃ hot water soap washing tanks, and the last 2 tanks are clean water tanks, a total of 9 tanks. The washing speed is set to 60 yards / min.

[0084] The application effect test is as follows:

[0085] 1. The method for determining outline clarity is: visual inspection. 100 individuals are selected to evaluate the clarity of the printed product. Three levels are set: poor, relatively good, and good. The percentages of the three levels among the 100 individuals are counted, and the highest percentage is selected as the final evaluation result.

[0086] 2. The method for determining the difference in color intensity between the front and back sides is as follows: Use a spectrophotometer to test, select one of the test samples as the standard 100%, and compare the remaining test samples with the standard sample in parallel.

[0087] 3. Determination of K / S value: Spectrophotometer test, when the value is larger, it means the color yield is higher, conversely, the smaller the value is, the lighter the color yield is. The front K / S value is the color yield on the front of the printed finished fabric, and the back K / S value is the color yield on the back of the printed finished fabric.

[0088] 4. The method for determining the permeability is: divide the K / S value on the reverse side of the printed product by the K / S value on the front side, and the resulting value is the permeability.

[0089] 5. Water retention test method: Refer to industry standard FZ / T 10015-2011. Take the color paste prepared that day and vertically immerse a piece of qualitative filter paper cut into 1cm width into the slurry 1cm. After half an hour, measure the height. If the height is less than 0.5cm, it is good; if the height is greater than 0.5cm and less than 1cm, it is good; if the height is greater than 1cm, it is poor.

[0090] The relevant test results of the online sizing reactive digital printing composite pastes of Examples 1 to 5 are shown in Table 2; the relevant test results of the online sizing reactive digital printing composite pastes of Examples 6 to 10 are shown in Table 3.

[0091] Further preferred examples 3, 4, 8, and 9 were compared with conventional sodium alginate paste and conventional O / W emulsified paste. Table 4 shows the comparative test data and application results. The comparative example "conventional sodium alginate paste" was prepared by adding 4% sodium alginate to 96% tap water; the "conventional O / W emulsified paste" was prepared by high-speed emulsification of 30 parts kerosene, 5 parts nonionic surfactant AEO9, and 65 parts tap water.

[0092] From the above test results, it can be seen that the printing contour clarity, water holding capacity, and front color intensity values ​​of the embodiments of the present invention are better than those of traditional sodium alginate paste and traditional O / W emulsified paste. Preferred embodiments 3 and 8 are the best, indicating that the present invention is a very excellent online sizing active digital printing paste, and its functional indicators fully meet the special requirements of simultaneous online sizing and online printing, solving the problems that have plagued the industry and reducing the application cost of the printing industry.

[0093] Table 1

[0094]

[0095] Table 2

[0096]

[0097]

[0098] Table 3

[0099]

[0100] Table 4

[0101]

[0102]

[0103] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited by the above embodiments, and any changes, modifications, substitutions, combinations, simplifications, etc. made without departing from the spirit and principles of the present application shall be equivalent replacement manners and shall be included in the protection scope of the present application.

Claims

1. A method for preparing an online sizing reactive digital printing paste, characterized in that: The following steps are involved: (1) Preparation of O / W emulsified paste: Add hydroxyethyl cellulose to water and stir to form a hydroxyethyl cellulose solution, then add a nonionic surfactant and stir at 250-350 rpm for 25-35 minutes; add dimethyl silicone oil at a stirring speed of 900-1100 rpm, add water after emulsification and continue stirring at 900-1100 rpm. Stop stirring when the viscosity reaches a stable viscosity to obtain an O / W emulsified paste with a viscosity of 12,000-45,000 cps; Wherein, the O / W type emulsified paste contains 30 parts of dimethyl silicone oil, 1 to 5 parts of hydroxyethyl cellulose, and 4 to 5 parts of nonionic surfactant, in parts by weight; (2) Preparation of printing paste: The O / W emulsified paste prepared in step (1) is mixed with a polyethylene glycol aqueous solution and stirred to obtain an online sizing reactive digital printing paste with a viscosity of 16,000 to 50,000 cps.

2. The method for preparing an online sizing reactive digital printing paste according to claim 1, wherein: The method for preparing the polyethylene glycol aqueous solution comprises the following steps: adding polyethylene glycol powder into water at a temperature of 60 to 80° C. to prepare a polyethylene glycol aqueous solution with a mass concentration of 2 to 3 wt %.

3. The method for preparing an online sizing reactive digital printing paste according to claim 2, wherein: The mass ratio of the polyethylene glycol aqueous solution to the O / W emulsified paste is 1:1 to 9:

1.

4. The method for preparing an online sizing reactive digital printing paste according to claim 3, wherein: The O / W emulsified paste contains 2 to 4 parts of hydroxyethyl cellulose; the viscosity of the O / W emulsified paste is 12,000 to 32,000 cps.

5. The method for preparing online sizing reactive digital printing paste according to claim 2, characterized in that: The polyethylene glycol powder is PEG6000 powder.

6. The method for preparing online sizing reactive digital printing paste according to claim 1, characterized in that: The hydroxyethyl cellulose solution is prepared as follows: 1-5 parts of hydroxyethyl cellulose are added to 300 parts of water at a temperature of 0-50° C. and stirred at 250-350 rpm for 25-35 minutes.

7. The method for preparing online sizing reactive digital printing paste according to claim 1, characterized in that: The stirring in step (2) is specifically: stirring at a speed of 250 to 350 rpm for 8 to 12 minutes.

8. The method for preparing online sizing reactive digital printing paste according to claim 1, characterized in that: The nonionic surfactant is any one of fatty alcohol polyoxyethylene ether and polysorbate 80.

9. The method for preparing online sizing reactive digital printing paste according to claim 1, characterized in that: The O / W emulsified paste in step (1) contains 60-64 parts by weight of water.

10. Online sizing reactive digital printing paste, characterized in that, It is composed of O / W emulsified paste and polyethylene glycol aqueous solution; In parts by weight, the O / W emulsified paste contains 30 parts of dimethyl silicone oil, 1 to 5 parts of hydroxyethyl cellulose, 4 to 5 parts of nonionic surfactant, and 60 to 64 parts of water; The mass concentration of the polyethylene glycol aqueous solution is 2 to 3 wt%; The viscosity of the online sizing reactive digital printing paste is 16,000 to 50,000 cps.

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