A high-definition nylon digital printing process

Abstract

The present invention discloses a high-definition nylon digital printing process, belonging to the field of digital textile printing technology. The process includes fabric pretreatment and inkjet printing. The treatment solution comprises the following components, by weight: 91-93 parts water, 3-4 parts hyperbranched water-soluble polymer, 4-5 parts guar gum, 3-4 parts urea, 0.4-0.6 parts inorganic salt, and 0.001-0.1 parts acidity regulator. The pH value of the treatment solution is 4.2-4.8. The hyperbranched water-soluble polymer is formed by hyperbranched polymerization of a monomer 1 containing a secondary amine group and a monomer 2 containing pyrrolidone. The treatment solution used in the nylon digital printing process provided by the present invention contains a hyperbranched water-soluble polymer having amino and pyrrolidone structures. The two groups act on acid dye molecules and nylon fibers, respectively. The nylon digital printing product obtained after treatment with the treatment solution has the advantages of high definition, good levelness, and high color fastness.

Description

Technical Field

[0001] The invention belongs to the technical field of digital textile printing, and in particular relates to a high-definition digital textile printing process for nylon. Background Art

[0002] Inkjet printing has become increasingly important in the printing and dyeing industry in recent years, as it eliminates the need for platemaking, color matching, proofing, and roller production. Compared to traditional printing, it offers many distinct advantages, including high pattern fidelity; high production flexibility, rapid response, and diverse capabilities; and environmental friendliness, including high ink utilization, low noise levels, low water consumption, reduced wastewater discharge, and low energy consumption, meeting low-carbon and environmentally friendly requirements. Inkjet printing of nylon can typically utilize acid, disperse, and reactive dye inks. Acid dyes are the most commonly used for nylon dyeing, and are widely used for dyeing nylon garments, carpets, sportswear, and other applications.

[0003] However, nylon has a low amino content, and the dyeing capacity on the fabric is limited. Therefore, inkjet printing requires both pre- and post-treatment. Otherwise, a large amount of residual dye will float on the surface of the printed fabric, which can easily lead to ink bleeding and affect the clarity of the print. Therefore, a new digital printing process is still needed to solve the problem of low clarity in digital printing on nylon. Summary of the Invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a high-definition nylon digital printing process, in which nylon is pretreated using a treatment solution containing a hyperbranched water-soluble polymer. The product obtained by the digital printing process of the treated nylon has the advantages of high clarity, good levelness and high color fastness.

[0005] The technical solution for achieving the purpose of the present invention is as follows: A high-definition nylon digital printing process comprises the following steps:

[0006] Preparation of treatment liquid → fabric sizing → drying I → digital printing → drying II → steaming → washing I → soaping → washing II → drying III;

[0007] The treatment liquid comprises the following components by weight: 91-93 parts of water, 3-4 parts of hyperbranched water-soluble polymer, 4-5 parts of guar gum, 3-4 parts of urea, 0.4-0.6 parts of inorganic salt, and 0.001-0.1 parts of acidity regulator. The pH value of the treatment liquid is 4.2-4.8.

[0008] The hyperbranched water-soluble polymer is prepared by hyperbranching polymerization of monomer 1 of formula I and monomer 2 of formula II:

[0009]

[0010] Specifically, when the pH is within the range of 4.2 to 4.8, the amino groups in the hyperbranched water-soluble polymer and the nylon fiber can be converted into amino cations.

[0011] Preferably, the molar ratio of monomer 1 to monomer 2 is (30-60):1; the number average molecular weight of the hyperbranched water-soluble polymer is 10,000-20,000, and the molecular weight distribution coefficient is 1.5-2; the number average molecular weight and molecular weight distribution coefficient are determined according to gel permeation chromatography.

[0012] The preparation method of the hyperbranched water-soluble polymer is as follows:

[0013] 1) Under an inert gas atmosphere, 9-12 eq of monomer 1, 0.21-0.3 eq of hyperbranched initiator, 0.25-0.4 eq of cuprous bromide, and 50-60 eq of anhydrous anisole were added to a Shrek flask. After freeze-thaw degassing, 0.3-0.5 eq of N,N,N′,N″,N″-pentamethyldiethylenetriamine was added. After stirring at 55-65° C. for 1-2 h, 1.5-3 eq of monomer 2 was added. Stirring was continued for 1-2 h. Oxygen was introduced to terminate the reaction. Copper ions were removed by column chromatography. The resulting solution was concentrated by rotary evaporation, precipitated in cold methanol, filtered, and the solid product was collected and dried.

[0014] 2) Under an inert gas atmosphere and at a temperature of 0° C., 1 eq of the product obtained in step 1) was added to a three-necked flask, 30-35 eq of trifluoroacetic acid, and 30-35 eq of dichloromethane. The temperature was raised to 30-35° C. and stirring was continued for 2-4 h. The mixture was washed with a saturated sodium bicarbonate solution, and the organic phase was collected and dried on a rotary evaporator to obtain a hyperbranched water-soluble polymer.

[0015] It should be noted that the N-tert-butyloxycarbonyl (Boc) group is used to protect the amino group in the present invention. On the one hand, it prevents the competitive reaction between the amino group, the hydroxyl group and methacryloyl chloride, and on the other hand, it reduces the activity of the amino group to prevent it from complexing with copper during polymerization, resulting in deactivation of the catalyst.

[0016] Preferably, the temperature of the drying I is 100-120°C; the temperature of the drying II is 95-105°C; the temperature of the steaming is 100-105°C, and the state is saturated steam at normal pressure.

[0017] Preferably, the soap washing uses 1-2 g / L of standard soap flakes, the temperature is 90-100° C., and the washing time is 8-12 min; the water washing I is a cold water washing for 4-6 min, followed by a warm water washing at 35-45° C. for 4-6 min; the water washing II is a warm water washing at 35-45° C. for 4-6 min, followed by a cold water washing for 4-6 min; the water bath ratios of the soap washing, water washing I, and water washing II are all 40:1-20:1.

[0018] Preferably, the inorganic salt is one or more of chloride, sulfate, acetate and carbonate.

[0019] More preferably, the inorganic salt is ammonium acetate.

[0020] Preferably, the acidity regulator is one or more of acetic acid, hydrochloric acid, sulfuric acid and oxalic acid.

[0021] More preferably, the acidity regulator is acetic acid.

[0022] The cations in the inorganic salts dispersed in the fibers can adsorb negatively charged dye molecules and increase the color depth of the print; ammonium acetate and acetic acid form a buffer solution when the acidity is adjusted, which can ensure the stability of the solution when adjusting the pH value.

[0023] Specifically, the monomer 1 is prepared by the following method: 1.0 eq of N-(tert-butyloxycarbonyl)ethanolamine, 1.5 to 2.0 eq of triethylamine, and 20 eq of anhydrous toluene are added to a three-necked flask; 1.5 to 2.0 eq of acryloyl chloride is dissolved in 20 eq of anhydrous toluene at a temperature of -10 to 5°C under an inert gas atmosphere; the mixture is slowly added to the three-necked flask using a syringe; the mixture is stirred and reacted at room temperature for 36 to 48 hours, filtered, and the resulting solution is concentrated, dissolved in dichloromethane, washed with an aqueous sodium hydroxide solution, and the organic phase is collected and dried on a rotary evaporator to obtain monomer 1.

[0024] Specifically, the monomer 2 is prepared by the following method: 1.0 eq of N-hydroxyethyl-2-pyrrolidone, 1.5 to 2.0 eq of triethylamine, and 20 eq of anhydrous toluene are added to a three-necked flask; 1.5 to 2.0 eq of acryloyl chloride is dissolved in 20 eq of anhydrous toluene at a temperature of -10 to 5° C. under an inert gas atmosphere; the mixture is slowly added to the three-necked flask using a syringe; the mixture is stirred and reacted at room temperature for 36 to 48 hours, filtered, and the resulting solution is concentrated, dissolved in dichloromethane, washed with an aqueous sodium hydroxide solution, and the organic phase is collected and evaporated to dryness using a rotary evaporator to obtain monomer 2.

[0025] Specifically, the hyperbranched initiator is 2-(2-bromoisobutoxy)ethyl acrylate, which can be commercially available or homemade. Preferably, the hyperbranched initiator is prepared by the following method: 1eq hydroxyethyl acrylate, 1.5-2.0eq triethylamine and 40-50eq dichloromethane solvent are added to a three-necked flask; under an inert gas atmosphere and at a temperature of -10-5°C, 1.2-1.3eq 2-bromoisobutyryl bromide is slowly added dropwise to the three-necked flask; stirred at room temperature for 12-24h; after the reaction is completed, washed with saturated sodium bicarbonate solution and saturated sodium chloride solution in sequence, dried with anhydrous magnesium sulfate, and then separated and purified with a silica gel column to obtain a hyperbranched initiator.

[0026] Specifically, the concentration of the sodium hydroxide aqueous solution is 1 to 2 mol / L.

[0027] Beneficial effects

[0028] The present invention has the following beneficial effects: A high-definition digital printing process for nylon is provided, in which nylon is pretreated with a treatment solution containing a hyperbranched water-soluble polymer. The core of the hyperbranched water-soluble polymer contains a large number of amino groups. Under acidic conditions, the amino cations formed repel each other, creating pores large enough to adsorb negatively charged dye molecules, preventing the dye molecules from coloring and diffusing too quickly, which would otherwise reduce clarity. The shell of the hyperbranched water-soluble polymer, which contains a large number of pyrrolidone and acrylate structures, has a similar polarity to nylon. Its compact spherical structure allows a portion of the polymer to more easily penetrate the micropores and amorphous regions of the nylon fiber, while another portion forms a more uniform coating on the nylon surface. The spherical structure creates a microscopic "concave-convex" structure on the fiber surface, helping to better control the shape and size of the ink droplets. When heated at high temperatures, the hyperbranched water-soluble polymer provides a large number of dye sites, and the amino groups further react with pyrrolidone and acid dye molecules to form a cross-linked film, which adheres to the surface of the fabric and fixes the color. The nylon digital printing products obtained after treatment with this treatment liquid have the advantages of high clarity, good level dyeing and high color fastness. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The invention provides a synthetic route for the hyperbranched water-soluble polymer and its monomers;

[0030] Figure 2 This is the H NMR spectrum of monomer 1 of the present invention;

[0031] Figure 3 This is the H NMR spectrum of monomer 2 of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0034] The raw materials and equipment used in the embodiments and comparative examples are described below:

[0035] Guided belt digital printing machine: model DTBS-1638, purchased from Chengdu Jinzhida Digital Technology Co., Ltd.

[0036] Nylon fabric: nylon plain cloth, yarn count 4040, 180g, purchased from Haining Baichuang Textile Co., Ltd.

[0037] Acid dyes: acid yellow, acid black, acid blue, and acid red, purchased from Shangyu Guangming Chemical Co., Ltd.

[0038] Standard soap flakes: International standard soap powder, purchased from Standard Group Co., Ltd.;

[0039] Guar gum: purchased from Zhengzhou Pu'er Chemical Products Co., Ltd.

[0040] Inorganic salts: ammonium acetate, product number A800996, purchased from Shanghai MacLean Biochemical Technology;

[0041] Acidity regulator: acetic acid, product number A801301, purchased from Shanghai MacLean Biochemical Technology;

[0042] Cuprous bromide: Product No. C804582, purchased from Shanghai MacLean Biochemical Technology;

[0043] N,N,N`,N`,N``-pentamethyldiethylenetriamine: product number N822749, purchased from Shanghai MacLean Biochemical Technology;

[0044] Trifluoroacetic acid: Product No. T818778, purchased from Shanghai MacLean Biochemical Technology;

[0045] N-(tert-Butyloxycarbonyl)ethanolamine: Product No. N802367, purchased from Shanghai MacLean Biochemical Technology;

[0046] Methacryloyl chloride: product number A800376, purchased from Shanghai MacLean Biochemical Technology;

[0047] Hydroxyethyl acrylate: Product No. H810915, purchased from Shanghai MacLean Biochemical Technology;

[0048] 2-Bromoisobutyryl bromide: Product No. B802437, purchased from Shanghai MacLean Biochemical Technology;

[0049] O-Hydroxyethyl-2-pyrrolidone: Product No. H799592, purchased from Shanghai MacLean Biochemical Technology.

[0050] Monomer 1

[0051] To a three-necked flask, 1.0 eq of N-(tert-butoxycarbonyl)ethanolamine, 2.0 eq of triethylamine, and 20 eq of anhydrous toluene were added. Under an inert gas atmosphere, 1.8 eq of acryloyl chloride was dissolved in 20 eq of anhydrous toluene at 0°C and then slowly added to the three-necked flask using a syringe. The reaction was stirred at room temperature for 40 hours, filtered, and the resulting solution was concentrated, dissolved in dichloromethane, and washed three times with aqueous sodium hydroxide solution. The organic phase was collected and evaporated to obtain monomer 1.

[0052] Monomer 2

[0053] To a three-necked flask, 1.0 eq of N-hydroxyethyl-2-pyrrolidone, 2.0 eq of triethylamine, and 20 eq of anhydrous toluene were added. Under an inert gas atmosphere and at a temperature of 0°C, 1.8 eq of acryloyl chloride was dissolved in 20 eq of anhydrous toluene and then slowly added to the three-necked flask using a syringe. The reaction was stirred at room temperature for 40 h, filtered, and the resulting solution was concentrated, dissolved in dichloromethane, and washed three times with aqueous sodium hydroxide solution. The organic phase was collected and dried on a rotary evaporator to obtain monomer 2.

[0054] Hyperbranched initiators

[0055] To a three-necked flask, 1 eq of hydroxyethyl acrylate, 2.0 eq of triethylamine, and 45 eq of dichloromethane solvent were added. Under an inert gas atmosphere, 1.3 eq of 2-bromoisobutyryl bromide was slowly added dropwise to the three-necked flask at -10°C. The mixture was stirred at room temperature for 24 hours. After the reaction was completed, the mixture was washed with saturated sodium bicarbonate solution and saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and then separated and purified using a silica gel column to obtain a hyperbranched initiator.

[0056] Hyperbranched water-soluble polymer 1

[0057] Under an inert gas atmosphere, 9 eq of monomer 1, 0.21 eq of hyperbranched initiator, 0.25 eq of cuprous bromide, and 50 eq of anhydrous anisole were added to a Shrek flask. After freeze-thawing and degassing three times, 0.3 eq of N,N,N′,N″,N″-pentamethyldiethylenetriamine was added, and the mixture was stirred at 60°C for 2 h. 1.5 eq of monomer 2 was then added, and stirring was continued for 1 h. Oxygen was introduced to terminate the reaction, and copper ions were removed by column chromatography. The resulting solution was concentrated, precipitated in cold methanol, filtered, and the solid product was collected and dried.

[0058] Under an inert gas atmosphere and at 0°C, 1 eq of the product obtained in step 1), 30 eq of trifluoroacetic acid, and 30 eq of dichloromethane were added to a three-necked flask. The temperature was raised to 30°C and stirring was continued for 2 h. The mixture was washed three times with saturated sodium bicarbonate solution. The organic phase was collected and dried to obtain a hyperbranched water-soluble polymer 1.

[0059] Hyperbranched water-soluble polymer 2

[0060] Under an inert gas atmosphere, 12 eq of monomer 1, 0.3 eq of hyperbranched initiator, 0.4 eq of cuprous bromide, and 60 eq of anhydrous anisole were added to a Shrek flask. After freeze-thawing and degassing three times, 0.5 eq of N,N,N′,N″,N″-pentamethyldiethylenetriamine was added, and the mixture was stirred at 60°C for 1 h. 3 eq of monomer 2 was then added, and stirring was continued for 2 h. Oxygen was introduced to terminate the reaction, and copper ions were removed by column chromatography. The resulting solution was concentrated, precipitated in cold methanol, filtered, and the solid product was collected and dried.

[0061] Under an inert gas atmosphere and at 0°C, 1 eq of the product obtained in step 1), 30 eq of trifluoroacetic acid, and 30 eq of dichloromethane were added to a three-necked flask. The temperature was raised to 30°C and stirring was continued for 2 h. The mixture was washed three times with saturated sodium bicarbonate solution. The organic phase was collected and dried on a rotary evaporator to obtain a hyperbranched water-soluble polymer 2.

[0062] Hyperbranched water-soluble polymer 3

[0063] The preparation method is different from that of hyperbranched polymer 2, except that 3eq of monomer 2 is replaced by 3eq of monomer 1;

[0064] Hyperbranched water-soluble polymer 4

[0065] The preparation method is different from that of hyperbranched polymer 2, except that 12eq of monomer 1 is replaced by 12eq of monomer 2;

[0066] Linear water-soluble polymers

[0067] Under an inert gas atmosphere, 12 eq of monomer 1, 0.3 eq of 2-bromoisobutyryl bromide, 0.4 eq of cuprous bromide, and 60 eq of anhydrous anisole were added to a Shrek flask. The mixture was freeze-thawed and degassed three times. Then, under a nitrogen atmosphere, 0.5 eq of N,N,N′,N″,N″-pentamethyldiethylenetriamine was added. The mixture was stirred at 60°C for 2 h, and then 3 eq of monomer 2 was added. Stirring was continued for 1 h. After the reaction was completed, oxygen was introduced under ice-bath conditions. Copper ions were removed by column chromatography. The resulting solution was concentrated, precipitated in cold methanol, filtered, and the solid product was collected and dried.

[0068] In a three-necked flask, 1 eq of the product obtained in step 1), 30 eq of trifluoroacetic acid and 30 eq of dichloromethane were added at 0°C, the temperature was raised to 30°C and stirring was continued for 2 h. The mixture was washed three times with saturated sodium bicarbonate solution. The organic phase was collected and dried to obtain a linear water-soluble polymer.

[0069] The following are the test methods for the performance parameters involved in the present invention:

[0070] Number average molecular weight: The polymer before hydrolysis was measured by gel permeation chromatography-differential detection (Waters, USA);

[0071] Molecular weight distribution coefficient: The polymer before hydrolysis was tested by gel permeation chromatography-differential detection (Waters, USA);

[0072] H NMR spectrum: 400 MHz NMR spectrometer (Bruker, Germany);

[0073] Table 1 Physical and chemical properties of hyperbranched water-soluble polymers

[0074]

[0075] As can be seen from the data in Table 1, the number average molecular weight of the hyperbranched water-soluble polymer is 10,000 to 20,000, and the molecular weight distribution coefficient is 1.5 to 2. According to the molecular weight distribution coefficient, it can be seen that the molecular weight distribution coefficients of hyperbranched water-soluble polymers 1 to 4 are larger, and the molecular weight distribution coefficient of linear water-soluble polymers is smaller, which is consistent with the molecular weight distribution range of hyperbranched and linear polymers obtained by common ATRP polymerization. Figures 2-3 1 is the H NMR spectrum of monomer 1 and monomer 2.

[0076] Examples and Comparative Examples

[0077] A high-definition nylon digital printing process includes the following steps:

[0078] Preparation of treatment liquid → fabric sizing → drying I → digital printing → drying II → steaming → washing I → soaping → washing II → drying III;

[0079] The formula of the treatment liquid is shown in Table 2. The preparation method of the treatment liquid is as follows: 91-93 parts of water, 3-4 parts of hyperbranched water-soluble polymer, 4-5 parts of guar gum, and 0.4-0.6 parts of inorganic salt are added to a container, and an acidity regulator is added to adjust the pH value to 4.5;

[0080] The specific steps of fabric sizing are as follows: immerse the nylon fabric in the treatment solution for 15 minutes, then take it out, and use a padder to squeeze out the excess solution. The padder speed is set to 30r / min and the pressure is set to 0.3MPa. After the second immersion and second squeezing, the fabric is placed in an oven for drying at a drying temperature of 100℃.

[0081] The specific steps of digital printing are as follows: the nylon fabric is fixed and fed into a guide belt digital printing machine, and a single-channel printing machine is used for printing using Adobe Illustrator 2021 software, where the inkjet printing content is 15cm×4cm CMYK four-color blocks and 353μm lines;

[0082] The printed nylon was then dried I (temperature 120°C) → steaming (standard pressure, temperature 100°C) → washing I (cold water washing for 5 minutes, warm water washing at 40°C for 4-6 minutes) → soap washing (standard soap flakes 1.5 g / L, temperature 90°C, 12 minutes) → washing II (warm water washing at 40°C for 5 minutes, cold water washing for 5 minutes) → drying II (temperature 100°C) to obtain the printed nylon. The wash-bath ratio was 30:1.

[0083] The digitally printed nylon fabrics of the examples and comparative examples were subjected to the following performance tests:

[0084] (1) K / S value: measured using a DataColor 850 colorimeter, with the light source set to D65, the viewing angle to 10°, the aperture selected to be a medium aperture (20 mm), and the fabric folded four times;

[0085] (2) Fixation rate: Where (K / S) f0 Measured before soaping, (K / S) f Measured after soaping.

[0086] (3) Color fastness to rubbing: The test is conducted in accordance with the standard GB / T 3920-2008 “Textiles—Tests for color fastness—Color fastness to rubbing”, and the degree of color staining after rubbing is used as the evaluation standard;

[0087] (4) Printing outline clarity: The printing straight lines on the fabric were observed using a three-dimensional ultra-depth digital microscope, and the printing outline clarity was evaluated by the line width change rate: Line width change rate The larger the W value, the higher the ink penetration and the worse the clarity of the printed pattern. Where D0 is the printed line width (353 μm) and D is the measured line width.

[0088] Table 2 Treatment solution formula

[0089]

[0090] Table 3 Test results of printed fabric performance

[0091]

[0092] From the data in Table 3, it can be seen that the printed nylon obtained by treating with the treatment liquid in Examples 1 to 3 has the advantages of high K / S value, high color fixation rate, low line width variation rate (ie, high clarity) and high color fastness to rubbing.

[0093] As can be seen from the data of Comparative Examples 1 to 2 in Table 3, the printed nylon obtained by treating the amino hyperbranched water-soluble polymer 3 prepared by monomer 1 or the hyperbranched water-soluble polymer 4 prepared by monomer 2 is not as good as Examples 1 to 3 in all aspects. Although the amino group can adsorb a large number of dye molecules, there is no reactive group between the amino group and the nylon fiber during the fixation stage; although the cyclic amide in the pyrrolidone of monomer 2 can react with the nylon fiber during the fixation stage, its adsorption capacity for dye molecules is weak; as can be seen from Comparative Example 3, the addition of linear water-soluble polymers also has a good effect, among which the amino group and the cyclic amide can play a role in adsorbing dye molecules and nylon fibers, but the effect is not as good as that of the hyperbranched water-soluble polymer; as can be seen from the data of Comparative Examples 4 and 5, not adding or adding too much of the hyperbranched water-soluble polymer prepared by the present invention will have a greater impact on the printing and dyeing performance. Excessive addition may cause ink droplets to aggregate on the surface of the nylon fiber, affecting the ink droplet diffusion behavior.

[0094] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-definition nylon digital printing process, characterized in that: The following steps are involved: Preparation of treatment liquid → fabric sizing → drying I → digital printing → drying II → steaming → washing I → soaping → washing II → drying III; The treatment liquid comprises the following components by weight: 91-93 parts of water, 3-4 parts of hyperbranched water-soluble polymer, 4-5 parts of guar gum, 3-4 parts of urea, 0.4-0.6 parts of inorganic salt, and 0.001-0.1 parts of acidity regulator. The pH value of the treatment liquid is 4.2-4.

8. The hyperbranched water-soluble polymer is prepared by hyperbranching polymerization of monomer 1 of formula I and monomer 2 of formula II: Formula I; Formula II; The preparation method of the hyperbranched water-soluble polymer is as follows: (1) Under an inert gas atmosphere, add 9-12 eq of monomer 1, 0.21-0.3 eq of hyperbranched initiator, 0.25-0.4 eq of cuprous bromide, and 50-60 eq of anhydrous anisole to a Shrek flask. After freeze-thaw degassing, add 0.3-0.5 eq of N,N,N',N'',N''-pentamethyldiethylenetriamine. After stirring at 55-65 °C for 1-2 h, add 1.5-3 eq of monomer 2. Continue stirring for 1-2 h, introduce oxygen to terminate the reaction, filter out copper ions by column chromatography, concentrate the resulting solution by rotary evaporator, precipitate in cold methanol, filter, collect the solid product, and dry it. (2) Under an inert gas atmosphere and at 0 °C, add 1 eq of the product obtained in step 1), 30-35 eq of trifluoroacetic acid, and 30-35 eq of dichloromethane into a three-necked flask, raise the temperature to 30-35 °C, continue stirring for 2-4 h, wash with saturated sodium bicarbonate solution, collect the organic phase, and dry it on a rotary evaporator to obtain a hyperbranched water-soluble polymer.

2. The nylon digital printing process according to claim 1, characterized in that: The drying temperature is 100-120°C; the drying II temperature is 95-105°C; the steaming temperature is 100-105°C, and the state is saturated steam at normal pressure.

3. The nylon digital printing process according to claim 1, characterized in that: The fabric sizing step comprises: immersing the nylon fabric in the treatment solution for 10 to 15 minutes, taking it out, squeezing out excess solution with a padder, setting the padder speed to 25 to 30 r / min and the pressure to 0.2 to 0.3 MPa, and then placing the fabric in an oven for drying at a drying temperature set to 95 to 105°C.

4. The nylon digital printing process according to claim 1, characterized in that: The soap washing uses 1-2 g / L of standard soap flakes, a temperature of 90-100°C, and a washing time of 8-12 min. The water washing I is a cold water wash for 4-6 min, followed by a warm water wash at 35-45°C for 4-6 min. The water washing II is a warm water wash at 35-45°C for 4-6 min, followed by a cold water wash for 4-6 min. The bath ratios of the soap washing, water washing I, and water washing II are all 40:1-20:

1.

5. The nylon digital printing process according to claim 1, characterized in that: The inorganic salt is one or more of chloride, sulfate, acetate and carbonate.

6. The nylon digital printing process according to claim 1, characterized in that: The acidity regulator is one or more of acetic acid, hydrochloric acid, sulfuric acid and oxalic acid.

7. The nylon digital printing process according to claim 1, characterized in that: The monomer 1 is prepared by the following method: 1.0 eq of N-(tert-butyloxycarbonyl)ethanolamine, 1.5-2.0 eq of triethylamine, and 20 eq of anhydrous toluene are added to a three-necked flask; 1.5-2.0 eq of acryloyl chloride is dissolved in 20 eq of anhydrous toluene at a temperature of -10-5°C under an inert gas atmosphere; the mixture is slowly added to the three-necked flask using a syringe; the mixture is stirred and reacted at room temperature for 36-48 hours, filtered, and the resulting solution is concentrated, dissolved in dichloromethane, washed with an aqueous sodium hydroxide solution, and the organic phase is collected and dried on a rotary evaporator to obtain monomer 1.

8. The nylon digital printing process according to claim 1, characterized in that: The monomer 2 is prepared by the following method: 1.0 eq of N-hydroxyethyl-2-pyrrolidone, 1.5-2.0 eq of triethylamine, and 20 eq of anhydrous toluene are added to a three-necked flask; 1.5-2.0 eq of acryloyl chloride is dissolved in 20 eq of anhydrous toluene at a temperature of -10-5°C under an inert gas atmosphere; the mixture is slowly added to the three-necked flask using a syringe; the mixture is stirred and reacted at room temperature for 36-48 hours, filtered, and the resulting solution is concentrated, dissolved in dichloromethane, washed with an aqueous sodium hydroxide solution, and the organic phase is collected and evaporated to dryness using a rotary evaporator to obtain monomer 2.

9. The nylon digital printing process according to claim 1, characterized in that: The hyperbranched initiator is prepared by the following method: 1 eq of hydroxyethyl acrylate, 1.5-2.0 eq of triethylamine, and 40-50 eq of dichloromethane solvent are added to a three-necked flask; 1.2-1.3 eq of 2-bromoisobutyryl bromide is slowly added dropwise to the three-necked flask at a temperature of -10-5°C under an inert gas atmosphere; the mixture is stirred at room temperature for 12-24 hours; after the reaction is completed, the mixture is washed with a saturated sodium bicarbonate solution and a saturated sodium chloride solution in sequence, dried over anhydrous magnesium sulfate, and then separated and purified using a silica gel column to obtain the hyperbranched initiator.

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