A continuous digital printing process for fabric printing

Abstract

The application discloses a continuous digital printing process for fabric printing and relates to the technical field of fabric printing, and comprises the following steps: S1, fabric preparation; S2, fabric pretreatment; for the fabric material that passes quality detection, performing fabric modification treatment, wherein the fabric modification treatment comprises performance treatment and microstructure treatment; S3, printing dye solution configuration; S4, fabric printing; S5, fabric post-treatment after printing; the microstructure treatment is used for constructing a micropore structure on the surface of the fabric fiber. The application grafts a responsive polymer chain on the fabric fiber by performing performance treatment on the fabric material, modifies the responsive polymer chain, obtains the fabric material containing specific characteristic charges, and performs printing operation in the state that the modified responsive polymer chain on the fabric material is kept stretched, then adjusts the temperature and sprays a top sealing layer on the printing pattern, which is favorable for improving the fixation effect of the printing dye and the washing resistance of the printed fabric.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fabric printing, in particular to a continuous digital printing process for fabric printing. BACKGROUND

[0002] Fabric printing is a process of forming patterns on fabric with dyes or paints. With the development of modern technology, digital printing technology has emerged. Digital printing technology controls the shape of the printing pattern and the printing process through computer software technology, greatly improving the controllability of the printing process. However, the existing printing technology cannot ensure the effective combination of printing dyes and fabric, resulting in poor fabric printing effect and poor color fixation effect of the printing pattern.

[0003] The defects of the existing fabric printing process are:

[0004] 1. Patent document CN105908538A discloses a wool fabric printing process, which mainly solves the problem of how to reduce the dyeing bath ratio and reduce the amount of active dyes. However, it does not consider how to solve the problems of poor fabric printing effect and poor color fixation effect of the printing pattern;

[0005] 2. Patent document CN115679691A discloses an environmentally friendly printing process for cotton fabric, which mainly solves the problem of how to make cotton fabric have antibacterial and ultraviolet resistance. However, it does not consider how to improve the accuracy of the printing pattern in the fabric printing process;

[0006] 3. Patent document CN113089220A discloses a printing process for polyester blended fabric, which mainly solves the problem of how to avoid fabric deformation during printing. However, it does not consider how to increase the dye anchoring points on the surface of the fabric and improve the color fixation effect of the fabric. SUMMARY

[0007] The present application aims to provide a continuous digital printing process for fabric printing to solve the problems mentioned in the background.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solution: a continuous digital printing process for fabric printing, comprising the following steps:

[0009] S1, fabric preparation: introducing the fabric from the fabric roll into the guide release roller frame for fabric unwinding, and during the fabric unwinding process, quality detection and defect marking of the fabric are performed;

[0010] S2, fabric pretreatment: for fabric with qualified quality detection, performing fabric modification treatment, wherein the fabric modification treatment includes performance treatment and microstructure treatment;

[0011] S3, printing dye liquor configuration: configure the required printing dyes according to the fabric performance treatment results and printing requirements;

[0012] S4, fabric printing: inject the configured printing dyes into the printing device, and pass the modified fabric into the printing device for fabric printing to obtain printed fabric;

[0013] S5, post-treatment of printed fabric: for the printed fabric, preliminary steam curing and fabric setting are performed, then layer spraying is performed for top sealing and curing, and then the printed fabric is subjected to washing and drying treatment;

[0014] The microstructure treatment is used to construct a micropore structure on the surface of the fabric fibers and increase the printing dye liquor anchoring points on the surface of the fabric fibers, and the performance treatment is used to chemically modify the fabric and improve the combination ability of the printing dye liquor and the fabric.

[0015] Preferably, the quality detection of the fabric in the fabric preparation includes using infrared optical detection technology and image recognition technology to detect the quality of the fabric surface.

[0016] Preferably, the microstructure treatment in the fabric pretreatment includes the following steps:

[0017] A1, configure a micro-treatment liquid, the micro-treatment liquid is composed of water, a surfactant and a micropore auxiliary agent;

[0018] A2, inject the micro-treatment liquid into an ultrasonic treatment tank, and immerse the fabric to be treated in the micro-treatment liquid;

[0019] A3, under the conditions of 40-55℃ and 20-35HKz, treat for 3-8min, take out the treated fabric, and clean and dry the fabric.

[0020] Preferably, the micro-treatment liquid includes the following raw materials by weight: 80-90 parts of water, 0.5-2 parts of sodium dodecyl benzene sulfonate, 0.5-2 parts of glycerol, 0.5-1.5 parts of monolauryl phosphate, 0.5-1.5 parts of polyethylene glycol, and 0.5-1 part of citric acid.

[0021] Preferably, the performance treatment includes the following steps:

[0022] B1, perform degreasing and micro-hydrolysis treatment on the fabric;

[0023] B2, perform initiation treatment on the fabric to form polymer initiation sites on the fabric fibers;

[0024] B3, graft responsive polymer chains to the fabric treated by the initiation treatment at the polymer initiation sites;

[0025] B4, the responsive polymer chain is modified to obtain a fabric with a modified responsive polymer chain.

[0026] Preferably, the B1, the fabric is subjected to degreasing and micro-hydrolysis treatment, including the following steps:

[0027] The degreasing and micro-hydrolysis solution is configured: the raw materials and their weight parts in the degreasing and micro-hydrolysis solution are as follows: 80-95 parts of water, 0.5-2.5 parts of fatty alcohol polyoxyethylene ether, 0.5-1.5 parts of sodium hydroxide, 0.5-1 part of glycerol, 0.5-1 part of propylene glycol;

[0028] The degreasing and micro-hydrolysis treatment is carried out: under the condition of bath ratio 1: (20-30), 50-70℃, for 15-30min, and then the fabric is washed and dried.

[0029] The initiation treatment of the fabric in B2 includes: mixing 1-3 parts of potassium persulfate, 90-95 parts of water, and 1-2 parts of sodium thiosulfate to configure the initiation treatment solution, and then putting the fabric obtained in B1 into the initiation treatment solution, and treating it at 20-60℃ for 20-30min, and then washing and drying the fabric, and forming polymer initiation sites on the fabric fibers.

[0030] Preferably, the grafting of the responsive polymer chain at the polymer initiation site in B3 includes: mixing 4-10 parts of N-isopropyl acrylamide, 1-3 parts of acrylamide, 0.1-0.5 parts of N,N'-methylene bisacrylamide, 0.1-0.3 parts of thioethanol, and 60-85 parts of water to configure a grafting solution, which is used for grafting the responsive polymer chain at the polymer initiation site of the fabric fibers.

[0031] The modification of the responsive polymer chain in B4 includes adjusting the PH of the grafting solution of B3, and then adding 1-3 parts of acrylic acid to it, and mixing uniformly to obtain a performance treatment solution for the fabric.

[0032] The fabric is immersed in the performance treatment solution, treated under the condition of nitrogen protection and 20-28℃ for 60-100min, and then washed and dried.

[0033] Preferably, the configuration of the printing dye solution in S3 includes: configuring a printing dye solution with cationic dyes that meet the printing color requirements, and the raw materials and their weight parts in the printing dye solution are as follows: 5-20 parts of cationic dyes, 1-5 parts of sodium polyacrylate, 0.5-1 part of alkylphenol polyoxyethylene ether, 80-150 parts of water, 1-3 parts of dimethyl eicosyl ammonium chloride, and 1-3 parts of polyacrylamide are mixed and dispersed with the aid of ultrasonic waves.

[0034] Preferably, the fabric printing in S4 comprises printing the fabric by using a multi-section temperature-controlled printing device, and the multi-section temperature-controlled printing device comprises a low-temperature printing section, a top-coat spraying section and a medium-high temperature setting section.

[0035] Preferably, the post-printing fabric treatment in S5 comprises spraying a top-coat solution on the top of the printed fabric, and the raw materials and their weight parts in the top-coat solution are as follows: 80-120 parts of water-based polyurethane dispersion, 15-35 parts of modified polysiloxane emulsion, 1-3 parts of nano-silicon dioxide, 15-20 parts of nano-graphene, 15-25 parts of n-octadecane phase change microcapsules, 0.5-2 parts of cross-linking agent, 0.5-2 parts of dispersing agent, 0.5-2 parts of cosolvent, and 80-150 parts of water.

[0036] Compared with the prior art, the present application has the following advantages:

[0037] 1. The present application grafts responsive polymer chains on the fabric fibers by performance treatment, and modifies the responsive polymer chains by polymerizing anionic groups on the polymer chains to obtain fabric with specific charge characteristics, and then performs printing on the fabric in the state of keeping the modified responsive polymer chains stretched by setting a low-temperature printing section, and then adjusts the temperature and sprays a top-coat on the printed pattern, which is beneficial to improve the fixation of the printing dye and the wash resistance of the printed fabric.

[0038] 2. The present application prepares a printing dye with specific charge characteristics, and improves the interaction between the fabric and the dye based on the adsorption and guidance of the charge ions, thereby promoting the combination of the printing dye and the fabric, which is beneficial to quickly and firmly adsorb the printing dye molecules on the fabric, reduce the diffusion risk of the printing dye molecules, and further improve the printing accuracy.

[0039] 3. The present application performs microstructure treatment on the fabric by preparing a micro-treatment solution, constructs a micropore structure with a diameter of 1 μm on the fabric fibers with the aid of ultrasonic technology, thereby increasing the anchoring points of the printing dye ions and the fabric, which is beneficial to the combination of the printing dye ions and the fabric, and by adding polyethylene glycol and citric acid, the micro-pore size and distribution uniformity can be controlled when constructing the micropore structure, the micropore structure can be fixed, and the fabric fibers can be prevented from being damaged, thereby maintaining the quality of the fabric.

[0040] 4. This invention, by setting a top-coating section, transforms the modified responsive polymer chains on the fabric into a coiled state. When coating the printing dye, the top-coating layer is sprayed on the top of the printed pattern, thereby providing protection for the printing dye. Furthermore, the addition of water-based polyurethane dispersion and modified epoxy silane emulsion in the top-coating solution helps to improve the flexibility and hydrophobicity of the top-coating layer. The use of nano-graphene and n-octadecane phase change microcapsules helps to maintain the coiled state of the responsive polymer chains, thereby ensuring the color fixation effect of the printing dye. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] A continuous digital printing process for fabric printing includes the following steps:

[0043] S1. Fabric preparation: The fabric is introduced from the fabric roll and connected to the guide release roller frame for unwinding. During the unwinding process, the fabric is inspected for quality and defective points are marked.

[0044] S2. Fabric pretreatment: For fabrics that have passed quality inspection, fabric modification treatment is carried out, which includes performance treatment and microstructure treatment.

[0045] S3. Preparation of printing dye liquor: Prepare the required printing dyes according to the fabric performance treatment results and printing requirements;

[0046] S4. Fabric printing: The prepared printing dye is injected into the printing device, and the modified fabric is passed into the printing device for fabric printing to obtain printed fabric.

[0047] S5. Post-printing fabric treatment: For printed fabrics, perform preliminary steam curing and fabric setting, then perform spray sealing and curing, and then wash and dry the printed fabrics.

[0048] In the fabric preparation process, the quality inspection of the fabric includes the use of infrared optical detection technology and image recognition technology to inspect the quality of the fabric surface. When defects such as broken threads or snags are detected on the fabric surface, the defective points are marked and the staff are notified to deal with the defective locations, which helps to improve the pass rate of printed fabrics.

[0049] The fabric printing in S4 includes printing the fabric by using the multi-section temperature control printing device, and the multi-section temperature control printing device includes a low-temperature printing section, a top layer spraying section and a medium-high temperature setting section, the temperature range of the low-temperature printing section is 20-35℃, the temperature range of the top layer spraying section is 35-50℃, and the temperature range of the medium-high setting section is 80-120℃, by setting the multi-section temperature control printing device, the temperature in the fabric printing process is intelligently controllable, which is beneficial to improve the printing effect, and the setting of the multi-section temperature control printing device integrates printing, top sealing and curing setting, which is beneficial to the continuous printing operation.

[0050] Embodiment one:

[0051] A continuous digital printing process for fabric printing, comprising the following steps:

[0052] S1, fabric preparation;

[0053] S2, fabric pretreatment: the qualified fabric is cleaned or blown to remove the floating impurities on the surface of the fabric, and the fabric is modified, and the fabric modification includes performance treatment and microstructure treatment;

[0054] The microstructure treatment includes the following steps:

[0055] A1, 80 parts of water, 1 part of sodium dodecyl benzene sulfonate, 1.5 parts of glycerol, 0.8 monolauryl phosphate, 0.5 parts of polyethylene glycol, 1 part of citric acid are mixed to configure micro treatment liquid, and acetate or phosphate buffer solution is added to adjust the PH of the micro treatment liquid, and the PH of the adjusted micro treatment liquid is 6.5;

[0056] A2, the micro treatment liquid is injected into the ultrasonic treatment tank, and the fabric to be treated is immersed in the micro treatment liquid;

[0057] A3, under the condition of 50℃ and 30HKz, treat for 5min, take out the treated fabric, and clean and dry;

[0058] By preparing the micro treatment liquid to treat the fabric, the micro pore structure with a diameter of 1μm is constructed on the fabric fiber under the assistance of ultrasonic technology, which increases the anchoring points of printing dye ions and fabric, and is beneficial to the combination of printing dye ions and fabric, by adding polyethylene glycol and citric acid, the micro pore size and distribution uniformity can be controlled when constructing the micro pore structure, and the micro pore structure is fixed, which avoids damaging the fabric fiber, and is beneficial to maintaining the quality of the fabric;

[0059] The performance treatment includes the following steps:

[0060] B1, degreasing and micro-hydrolysis treatment is performed on the fabric;

[0061] The raw materials of the degreasing and micro-hydrolysis solution and the weight parts thereof are: 85 parts of water, 1.5 parts of fatty alcohol polyoxyethylene ether, 1 part of sodium hydroxide, 0.8 parts of glycerol, and 0.8 parts of propylene glycol;

[0062] The fabric is immersed in the degreasing and micro-hydrolysis solution at a bath ratio of 1:25, treated at 60°C for 20 minutes, and then washed and dried;

[0063] B2, initiation treatment is performed on the fabric to form polymerization initiation sites on the fabric fibers;

[0064] Specifically, 1.5 parts of potassium persulfate, 90 parts of water, and 1 part of sodium thiosulfate are mixed to prepare an initiation treatment solution, and the fabric treated by degreasing and micro-hydrolysis is immersed in the initiation treatment solution and treated at 26°C for 30 minutes;

[0065] B3, grafting responsive polymer chains at the polymerization initiation sites on the fabric treated by initiation;

[0066] B4, modification of the responsive polymer chains to obtain fabric containing modified responsive polymer chains;

[0067] Specifically, 8 parts of N-isopropyl acrylamide, 1.5 parts of acrylamide, 0.4 parts of N,N'-methylene bisacrylamide, 0.3 parts of thioethanol, and 80 parts of water are mixed to prepare a grafting solution, and the preparation process is carried out under nitrogen protection;

[0068] The pH of the grafting solution is adjusted to 5.5, 2.5 parts of acrylic acid are added to the grafting solution, and the mixture is treated under nitrogen protection at 25°C for 150 minutes, and then mixed uniformly to obtain a performance treatment solution for fabric;

[0069] The fabric is immersed in the performance treatment solution and treated under nitrogen protection at 28°C for 90 minutes, and then washed and dried;

[0070] The fabric is treated by preparing a degreasing and micro-hydrolysis solution to remove oil on the surface of the fabric, and then the fabric is subjected to initiation treatment and grafting modification treatment, and the responsive polymer chains are grafted at the initiation sites, and anions are grafted on the responsive polymer chains to obtain fabric containing specific charge characteristics;

[0071] S3, printing dye liquor configuration: configure the required printing dyes according to the fabric performance treatment results and the printing requirements, the raw materials used in the printing dye liquor and the weight parts thereof include 10 parts of cationic dyes, 2 parts of sodium polyacrylate, 0.6 parts of alkylphenol polyoxyethylene ether, 100 parts of water, 1.3 parts of dimethyl eicosyl ammonium chloride, 1.5 parts of polyacrylamide, and auxiliary ultrasonic dispersion, wherein the cationic dyes are cationic dyes including the colors required for printing, and the depth of printing colors can be adjusted by increasing or decreasing the number of parts of cationic dyes;

[0072] S4, fabric printing: inject the configured printing dyes into the printing device, and pass the modified fabric into the printing device for fabric printing, and the printed fabric passes through the low-temperature printing section, the top layer spraying section and the medium-high temperature setting section in sequence, wherein the temperature of the low-temperature printing section is 23℃, the temperature of the top layer spraying section is 40℃, and the temperature of the medium-high temperature setting section is 95℃;

[0073] By preparing the printing dye liquor corresponding to the fabric with specific charge characteristics, the interaction between the fabric and the dye is improved through the adsorption guiding action of the charge ions, thereby promoting the combination of the printing dye and the fabric, which is beneficial to the rapid and firm adsorption of the printing dye molecules on the fabric, reduces the diffusion risk of the printing dye molecules, and thereby improves the printing accuracy. By using low-temperature printing, the responsive polymer chains on the fabric are in an extended state when printing, and after printing, the fabric is moved to the top layer spraying section and the medium-high temperature setting section with higher temperature for top layer spraying and medium-high temperature setting, so that the responsive polymer chains on the fabric fiber are curled, and the combined printing dye molecules are coated, thereby improving the fixation effect of the printing dye;

[0074] S5, fabric post-treatment after printing includes spraying a top layer solution on the top of the printed fabric, and the top layer spraying solution is prepared by mixing 100 parts of water-based polyurethane dispersion, 25 parts of modified polysiloxane emulsion, 2 parts of nano silicon dioxide, 15 parts of nano graphene, 20 parts of n-octadecane phase change microcapsules, 1.5 parts of crosslinking agent, 1.5 parts of dispersant, 1 part of cosolvent, and 130 parts of water, and the crosslinking agent is a polyisocyanate crosslinking agent, the dispersant is sodium polyacrylate, and the cosolvent is ethylene glycol methyl ether.

[0075] Example two:

[0076] A continuous digital printing process for fabric printing, comprising the following steps:

[0077] S1, fabric preparation;

[0078] S2, fabric pretreatment: the qualified fabric is cleaned or blown to remove the floating impurities on the surface of the fabric, and the fabric is modified, and the fabric modification includes performance treatment and microstructure treatment;

[0079] The microstructure treatment is performed in the manner of embodiment one.

[0080] The performance treatment includes the following steps:

[0081] B1, the fabric is subjected to degreasing and micro-hydrolysis treatment, and the degreasing and micro-hydrolysis treatment method is performed in the manner of embodiment one.

[0082] B2, the fabric is subjected to initiation treatment to form polymerization initiation sites on the fabric fibers;

[0083] Specifically, 1 part of potassium persulfate, 90 parts of water and 1 part of sodium thiosulfate are mixed to prepare an initiation treatment solution, and the fabric after degreasing and micro-hydrolysis treatment is immersed in the initiation treatment solution and treated at 26°C for 30 min.

[0084] B3, grafting responsive polymer chains at the polymerization initiation sites of the fabric after initiation treatment;

[0085] B4, modifying the responsive polymer chains to obtain fabric with modified responsive polymer chains;

[0086] Specifically, 6 parts of N-isopropyl acrylamide, 1 part of acrylamide, 0.4 parts of N,N'-methylene bisacrylamide, 0.3 parts of thioethanol, and 80 parts of water are mixed to prepare a grafting solution, and the preparation process is carried out under nitrogen protection.

[0087] The pH of the grafting solution is adjusted to 5.5, 2.5 parts of acrylic acid are added to the grafting solution, and the mixture is treated under nitrogen protection at 25°C for 150 min to obtain a solution for fabric performance treatment.

[0088] The fabric is immersed in the performance treatment solution and treated under nitrogen protection at 28°C for 90 min, and then the fabric is washed and dried.

[0089] S3, printing dye solution preparation: according to the fabric performance treatment results and printing requirements, the required printing dyes are prepared, and the raw materials and their weight parts in the printing dye solution include 10 parts of cationic dyes, 2 parts of sodium polyacrylate, 0.6 parts of alkylphenol polyoxyethylene ether, 100 parts of water, 1.3 parts of dimethyl eicosyl ammonium chloride, and 1.5 parts of polyacrylamide are mixed and dispersed with the aid of ultrasonic wave, wherein the cationic dyes are cationic dyes including the required color for printing, and the depth of printing color can be adjusted by increasing or decreasing the amount of cationic dyes.

[0090] S4, fabric printing: the prepared printing dye is injected into a printing device, and the modified fabric is fed into the printing device for fabric printing, and the printed fabric sequentially passes through a low-temperature printing section, a top layer spraying section and a medium-high temperature setting section, wherein the temperature of the low-temperature printing section is 23℃, the temperature of the top layer spraying section is 40℃, and the temperature of the medium-high temperature setting section is 95℃;

[0091] S5, the post-treatment of the printed fabric includes spraying a top layer solution on the top of the printed fabric, and the top layer spraying solution is prepared by mixing 100 parts of water-based polyurethane dispersion, 25 parts of modified polysiloxane emulsion, 2 parts of nano silicon dioxide, 15 parts of nano graphene, 20 parts of n-octadecane phase change microcapsule, 1.5 parts of crosslinking agent, 1.5 parts of dispersing agent, 1 part of cosolvent, and 130 parts of water, wherein the crosslinking agent is a polyisocyanate crosslinking agent, the dispersing agent is sodium polyacrylate, and the cosolvent is ethylene glycol methyl ether.

[0092] Example three:

[0093] A continuous digital printing process for fabric printing, comprising the following steps:

[0094] S1, fabric preparation;

[0095] S2, fabric pretreatment: the fabric with qualified detection is cleaned or blown to remove the floating impurities on the surface of the fabric, and the fabric is modified, and the fabric modification treatment includes performance treatment and microstructure treatment;

[0096] The microstructure treatment includes the following steps:

[0097] A1, 80 parts of water, 1 part of sodium dodecyl benzene sulfonate, 1.5 parts of glycerol, 0.8 monolauryl phosphate, 0.5 parts of polyethylene glycol, and 1 part of citric acid are mixed to prepare a microstructure treatment solution, and an acetate or phosphate buffer solution is added to adjust the pH of the microstructure treatment solution, and the pH of the adjusted microstructure treatment solution is 6.5;

[0098] A2, the microstructure treatment solution is injected into an ultrasonic treatment tank, and the fabric to be treated is immersed in the microstructure treatment solution;

[0099] A3, under the condition of 50℃ and 30HKz, treat for 5min, take out the treated fabric, and clean and dry;

[0100] The performance treatment includes the following steps:

[0101] B1, the fabric is subjected to degreasing and micro-hydrolysis treatment;

[0102] The defatting and micro-hydrolysis solution raw materials and their weight parts are: 85 parts of water, 1.5 parts of fatty alcohol polyoxyethylene ether, 1 part of sodium hydroxide, 0.8 parts of glycerol, and 0.8 parts of propylene glycol;

[0103] The fabric is immersed in the defatting and micro-hydrolysis solution at a bath ratio of 1:25, treated at 60°C for 20 min, and then washed and dried;

[0104] B2, initiating treatment is performed on the fabric to form polymer initiation sites on the fabric fibers;

[0105] Specifically, 1.5 parts of potassium persulfate, 90 parts of water, and 1 part of sodium thiosulfate are mixed to prepare an initiation treatment solution, and the fabric treated by defatting and micro-hydrolysis is immersed in the initiation treatment solution and treated at 26°C for 30 min;

[0106] B3, grafting responsive polymer chains at the polymer initiation sites is performed on the fabric treated by initiation;

[0107] B4, modification is performed on the responsive polymer chains to obtain fabric with modified responsive polymer chains;

[0108] Specifically, 8 parts of N-isopropyl acrylamide, 1.5 parts of acrylamide, 0.4 parts of N,N'-methylene bisacrylamide, 0.3 parts of thioethanol, and 80 parts of water are mixed to prepare a grafting solution, and the preparation process is performed under nitrogen protection;

[0109] The pH of the grafting solution is adjusted to 5.5, 2.5 parts of acrylic acid are added to the grafting solution, and the mixture is treated at 25°C for 150 min under nitrogen protection, and then uniformly mixed to obtain a performance treatment solution for fabric;

[0110] The fabric is immersed in the performance treatment solution and treated at 28°C for 90 min under nitrogen protection, and then washed and dried;

[0111] S3, printing dye solution preparation: printing dyes are prepared according to the fabric performance treatment results and printing requirements, and the raw materials used in the printing dye solution and their weight parts include 10 parts of cationic dyes, 2 parts of sodium polyacrylate, 0.6 parts of alkylphenol polyoxyethylene ether, 100 parts of water, 1.3 parts of dimethyl eicosyl ammonium chloride, and 1.5 parts of polyacrylamide are mixed and dispersed with the aid of ultrasonic waves, wherein the cationic dyes are cationic dyes including the colors required for printing, and the depth of the printing color can be adjusted by increasing or decreasing the amount of cationic dyes used;

[0112] S4, fabric printing: the prepared printing dye is injected into a printing device, and the modified fabric is fed into the printing device for fabric printing, and the printed fabric sequentially passes through a low-temperature printing section, a top layer spraying section and a medium-high temperature setting section, wherein the temperature of the low-temperature printing section is 35℃, the temperature of the top layer spraying section is 40℃, and the temperature of the medium-high temperature setting section is 95℃;

[0113] S5, the post-treatment of the printed fabric includes spraying a top layer solution on the top of the printed fabric, and the top layer spraying solution is prepared by mixing 100 parts of water-based polyurethane dispersion, 25 parts of modified polysiloxane emulsion, 2 parts of nano silicon dioxide, 15 parts of nano graphene, 20 parts of n-octadecane phase change microcapsule, 1.5 parts of crosslinking agent, 1.5 parts of dispersing agent, 1 part of cosolvent, and 130 parts of water, wherein the crosslinking agent is a polyisocyanate crosslinking agent, the dispersing agent is sodium polyacrylate, and the cosolvent is ethylene glycol methyl ether.

[0114] Example four:

[0115] A continuous digital printing process for fabric printing, comprising the following steps:

[0116] S1, fabric preparation;

[0117] S2, fabric pretreatment: the qualified fabric is cleaned or blown to remove the floating impurities on the surface of the fabric, and the fabric is modified, and the fabric modification includes performance treatment and microstructure treatment;

[0118] The microstructure treatment includes the following steps:

[0119] A1, 80 parts of water, 1 part of sodium dodecyl benzene sulfonate, 1.5 parts of glycerol, 0.8 parts of monolauryl phosphate, 0.5 parts of polyethylene glycol, and 1 part of citric acid are mixed to prepare a microstructure treatment solution, and an acetate or phosphate buffer solution is added to adjust the pH of the microstructure treatment solution, and the pH of the adjusted microstructure treatment solution is 6.5;

[0120] A2, the microstructure treatment solution is injected into an ultrasonic treatment tank, and the fabric to be treated is immersed in the microstructure treatment solution;

[0121] A3, under the condition of 50℃ and 30HKz, the treated fabric is taken out after 5min, and is cleaned and dried;

[0122] The performance treatment includes the following steps:

[0123] B1, the fabric is subjected to degreasing and micro-hydrolysis treatment;

[0124] The raw materials and their weight parts of the degreasing and micro-hydrolysis solution are: 85 parts of water, 1.5 parts of fatty alcohol polyoxyethylene ether, 1 part of sodium hydroxide, 0.8 parts of glycerol, and 0.8 parts of propylene glycol.

[0125] The fabric is soaked with the defatting and micro-hydrolysis solution at a bath ratio of 1:25, treated at 60°C for 20 min, and then washed and dried;

[0126] B2, initiating treatment is performed on the fabric to form polymer initiation sites on the fabric fibers;

[0127] Specifically, 1.5 parts of potassium persulfate, 90 parts of water, and 1 part of sodium thiosulfate are mixed to prepare an initiating treatment solution, and the defatted and micro-hydrolyzed fabric is immersed in the initiating treatment solution and treated at 26°C for 30 min;

[0128] B3, grafting responsive polymer chains at the polymer initiation sites on the fabric treated by initiating treatment;

[0129] B4, modifying the responsive polymer chains to obtain fabric containing modified responsive polymer chains;

[0130] Specifically, 8 parts of N-isopropyl acrylamide, 1.5 parts of acrylamide, 0.4 parts of N,N'-methylene bisacrylamide, 0.3 parts of thioethanol, and 80 parts of water are mixed to prepare a grafting solution, and the preparation process is carried out under nitrogen protection;

[0131] The pH of the grafting solution is adjusted to 5.5, 2.5 parts of acrylic acid are added to the grafting solution, and the mixture is treated under nitrogen protection at 25°C for 150 min. After uniform mixing, a solution for fabric performance treatment is obtained;

[0132] The fabric is immersed in the performance treatment solution and treated under nitrogen protection at 28°C for 90 min. After treatment, the fabric is washed and dried;

[0133] S3, printing dye solution preparation: according to the fabric performance treatment results and printing requirements, the required printing dyes are prepared, and the raw materials and their weight parts in the printing dye solution include 10 parts of cationic dyes, 2 parts of sodium polyacrylate, 0.6 parts of alkylphenol polyoxyethylene ether, 100 parts of water, 1.3 parts of dimethyl eicosyl ammonium chloride, and 1.5 parts of polyacrylamide are mixed and dispersed with the aid of ultrasonic waves. The cationic dyes are cationic dyes including the colors required for printing, and the depth of the printing color can be adjusted by increasing or decreasing the amount of cationic dyes used;

[0134] S4, fabric printing: the prepared printing dye is injected into the printing device, and the modified fabric is fed into the printing device for fabric printing, and the printed fabric passes through the low-temperature printing section, the top layer spraying section and the medium-high temperature setting section in sequence, wherein the temperature of the low-temperature printing section is 23℃, the temperature of the top layer spraying section is 40℃, and the temperature of the medium-high temperature setting section is 95℃;

[0135] S5, the post-treatment of the printed fabric includes spraying a top layer solution on the top of the printed fabric, and the top layer spraying solution is prepared by mixing 100 parts of water-based polyurethane dispersion, 25 parts of modified polysiloxane emulsion, 2 parts of nano silicon dioxide, 1.5 parts of crosslinking agent, 1.5 parts of dispersing agent, 1 part of cosolvent, and 130 parts of water, wherein the crosslinking agent is a polyisocyanate crosslinking agent, the dispersing agent is sodium polyacrylate, and the cosolvent is ethylene glycol methyl ether.

[0136] Comparative Example 1, compared with the continuous digital printing process for fabric printing in Example 1, the difference is that the fabric modification treatment in the fabric pretreatment in S2 is microstructure treatment.

[0137] Comparative Example 2, compared with the continuous digital printing process for fabric printing in Example 1, the difference is that the fabric modification treatment in the fabric pretreatment in S2 is modification treatment.

[0138] Comparative Example 3, a continuous digital printing process for fabric printing, comprising the following steps:

[0139] The fabric is surface cleaned with water to remove floating hairs and other impurities on the surface of the fabric, and the cleaned fabric is dried;

[0140] The printing dye is prepared according to the printing color requirements;

[0141] The fabric is printed using an integrated rotary screen printing equipment combined with the printing dye, and then the printed pattern is dried at 100℃.

[0142] Performance test,

[0143] The printed fabrics prepared in the examples and comparative examples are tested for performance, including printing dye color effect test, printed pattern color fastness test and printed pattern accuracy test. The printing dye color effect is determined by spectrophotometry, the printed pattern color fastness test is tested for water washing color fastness after washing for 5 times under the condition of 25℃ water temperature, and the reference standard is GB / T3921-2008 "Textile Color Fastness Test for Soap Washing Color Fastness", the printed pattern accuracy test is observed by using a high-resolution digital microscope to observe the edge of the printed pattern, measure the dye diffusion width of the edge of the printed pattern, measure 8 different edge positions of the printed pattern, and calculate the average value. The test results are shown in the following table:

[0144] According to the performance test results of the above-mentioned examples and comparative example one, it can be seen that by treating the fabric surface with microstructure, it is beneficial to increase the anchoring points of dye molecules on the fabric surface, and further improve the printing and dyeing effect of the fabric. According to the test results of example one and example two, it can be seen that by generating multiple groups of initiation sites on the fabric surface, it is convenient to graft multiple groups of responsive high molecular chains, and further provide more binding and adsorption sites for printing dyes with specific charges, and further improve the printing effect of the fabric. According to the test results of example one and example three, it can be seen that by setting a suitable printing section temperature, the printing dye is coated when the responsive high molecular chain is in an extended state, ensuring efficient combination of the printing dye and improving the printing effect. According to the test results of example one, four and comparative example three, it can be seen that by setting a capping layer on the top of the printed fabric, it is beneficial to improve the color fixing effect of the printed fabric and avoid the washability of the printed pattern.

[0145] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application should be defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and scope of equivalents of the claims.

Claims

1. A continuous digital printing process for fabric printing, characterized by: The method comprises the following steps: S1, fabric preparation: introducing the fabric from the fabric roll into the guiding and releasing roller frame for fabric unwinding, and detecting the quality of the fabric and marking the defective points during the fabric unwinding; S2, fabric pretreatment: performing fabric modification treatment on the fabric with qualified quality, wherein the fabric modification treatment comprises performance treatment and microstructure treatment; S3, printing dye solution preparation: preparing the required printing dye according to the fabric performance treatment result and printing requirements; S4, fabric printing: injecting the prepared printing dye into the printing device, and feeding the modified fabric into the printing device for fabric printing to obtain printed fabric; S5, post-treatment of printed fabric: performing preliminary steam curing and fabric setting on the printed fabric, then performing spray layer capping curing, and then performing water washing and drying treatment on the printed fabric; The microstructure treatment is used to construct micro-pore structure on the fabric fiber surface and increase the printing dye anchoring points on the fabric fiber surface, and the performance treatment is used to chemically modify the fabric and improve the combination ability of the printing dye and the fabric; The microstructure treatment in the fabric pretreatment comprises the following steps: A1, preparing micro-treatment solution, wherein the micro-treatment solution is composed of water, surfactant and micro-pore additive; A2, injecting the micro-treatment solution into the ultrasonic treatment tank, and immersing the fabric to be treated in the micro-treatment solution; A3, treating for 3-8 min under the condition of 40-55℃ and ultrasonic frequency of 20-35 kHz, taking out the treated fabric, and then cleaning and drying the fabric; The micro-treatment solution comprises the following raw materials by weight: 80-90 parts of water, 0.5-2 parts of sodium dodecyl benzene sulfonate, 0.5-2 parts of glycerol, 0.5-1.5 parts of monolauryl phosphate, 0.5-1.5 parts of polyethylene glycol, and 0.5-1 part of citric acid; The performance treatment comprises the following steps: B1, performing degreasing and micro-hydrolysis treatment on the fabric; B2, performing initiation treatment on the fabric to form polymer initiation sites on the fabric fibers; B3, grafting responsive polymer chains on the initiation treatment fabric at the polymer initiation sites; B4, modifying the responsive polymer chains to obtain fabric with modified responsive polymer chains; The B1, degreasing and micro-hydrolysis treatment on the fabric, comprises the following steps: Preparation of degreasing and micro-hydrolysis solution: the degreasing and micro-hydrolysis solution comprises the following raw materials and their weight parts: 80-95 parts of water, 0.5-2.5 parts of fatty alcohol polyoxyethylene ether, 0.5-1.5 parts of sodium hydroxide, 0.5-1 part of glycerol, and 0.5-1 part of propylene glycol; Degreasing and micro-hydrolysis treatment: treating for 15-30 min under the condition of bath ratio of 1: (20-30) and 50-70℃, and then cleaning and drying the fabric. The initiation treatment of the fabric in B2 comprises: mixing 1-3 parts of potassium persulfate, 90-95 parts of water and 1-2 parts of sodium thiosulfate to prepare an initiation treatment solution, and then putting the fabric obtained in B1 into the initiation treatment solution and treating at 20-60 DEG C for 20-30 min, and then washing and drying the fabric to form polymerization initiation sites on the fabric fibers; The grafting of responsive polymer chains at the polymerization initiation sites in B3 comprises: mixing 4-10 parts of N-isopropyl acrylamide, 1-3 parts of acrylamide, 0.1-0.5 parts of N,N'-methylene bisacrylamide, 0.1-0.3 parts of thioethanol and 60-85 parts of water to prepare a grafting solution, and then using the grafting solution to graft responsive polymer chains at the polymerization initiation sites of the fabric fibers; The modification of the responsive polymer chains in B4 comprises adjusting the pH of the grafting solution in B3, and then adding 1-3 parts of acrylic acid thereto and mixing uniformly to obtain a performance treatment solution for the fabric; The fabric is immersed in the performance treatment solution and treated at 20-28 DEG C for 60-100 min under nitrogen protection, and then washed and dried. The preparation of the printing dye solution in S3 comprises: mixing cationic dyes that meet the printing color requirements to prepare a printing dye solution, and the raw materials and their proportions in the printing dye solution are as follows: 5-20 parts of cationic dyes, 1-5 parts of sodium polyacrylate, 0.5-1 part of alkylphenol polyoxyethylene ether, 80-150 parts of water, 1-3 parts of dimethyl eicosyl ammonium chloride and 1-3 parts of polyacrylamide, and the mixture is dispersed with the aid of ultrasonic waves.

2. A continuous digital printing process for fabric printing as claimed in claim 1 wherein: The quality detection of the fabric in the fabric preparation comprises using infrared optical detection technology and image recognition technology to detect the quality of the fabric surface.

3. A continuous digital printing process for fabric printing as claimed in claim 1 wherein: The fabric printing in S4 comprises printing the fabric using a multi-section temperature control printing device, and the multi-section temperature control printing device comprises a low-temperature printing section, a top layer spraying section and a medium-high temperature setting section.

4. A continuous digital printing process for fabric printing as claimed in claim 1 wherein: The post-treatment of the printed fabric in S5 comprises spraying a top layer solution on the top of the printed fabric, and the raw materials and their proportions in the top layer solution are as follows: 80-120 parts of water-based polyurethane dispersion, 15-35 parts of modified polysiloxane emulsion, 1-3 parts of nano-silicon dioxide, 15-20 parts of nano-graphene, 15-25 parts of n-octadecane phase change microcapsules, 0.5-2 parts of crosslinking agent, 0.5-2 parts of dispersing agent, 0.5-2 parts of cosolvent, and 80-150 parts of water.

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