Method for carrying out chinlon inkjet printing by adopting acid / disperse dye compound digital printing ink

Abstract

The invention relates to the technical field of spinning, and discloses a method for carrying out chinlon inkjet printing by adopting acidic / disperse dye compound digital printing ink, which comprises the following steps: (1) carrying out sizing pretreatment on chinlon fabric by adopting pretreatment slurry, and then drying; (2) compounding an acid dye and a disperse dye, adding a humectant, an adhesive, a surface tension regulator and water, regulating ink jet parameters, and filtering through a filter membrane to obtain compound digital printing ink; and (3) carrying out ink-jet printing on the chinlon fabric by using the compound digital printing ink, and then drying to obtain the ink-jet printed chinlon fabric. The method comprises the following steps: firstly, carrying out sizing pretreatment on the chinlon fabric by using the compound slurry, and then carrying out inkjet printing on the chinlon fabric by using the compound digital printing ink, thereby finally obtaining the chinlon printed fabric with high color depth value, high saturation and clear pattern.

Description

Technical Field

[0001] This invention belongs to the technical field of textiles, and more specifically relates to a method for inkjet printing of nylon using a digital printing ink with a blend of acidic / disperse dyes. Background Technology

[0002] Nylon, as the second most widely used synthetic fiber, holds a significant position in the textile industry due to its excellent abrasion resistance, strength, and toughness. Its digital inkjet printing products are widely used in sportswear, swimwear, down jackets, mountaineering apparel, and other Olympic event apparel and equipment. However, due to nylon's unique molecular structure and dense crystal arrangement, it is difficult to obtain high-quality, personalized nylon digital inkjet printed products that simultaneously possess high color vibrancy, color depth, and color fastness. Numerous research findings have been reported on improving the quality of digital inkjet printing on textiles, such as using water-soluble polymers for fabric pretreatment, cationic modification and plasma treatment, designing novel dye molecular structures, and synthesizing dye polymer nanospheres. While pretreatment technology is quite mature in natural fibers such as cotton and silk, its application in synthetic fibers (especially nylon) still has significant limitations. For example, sodium alginate (SA), a commonly used pretreatment agent, can form a stable film on the surface of cotton fabrics, promoting dye ink diffusion and penetration; however, its easily degradable nature makes it difficult to effectively control the degree of ink penetration.

[0003] Hydroxypropyl methylcellulose (HPMC), an environmentally friendly water-soluble modified cellulose, has been widely used in the food, construction, and pharmaceutical industries. Furthermore, due to its excellent film-forming properties, this material has also been successfully applied to fabric pretreatment processes. Recently, researchers such as Fang Kuanjun have confirmed that HPMC pretreatment of fabric surfaces significantly improves inkjet printing quality compared to sulfonate pretreatment. On the other hand, the binding mode between dye molecules and fibers also poses a significant challenge to the performance of nylon digital inkjet printing, mainly due to the relative scarcity of surface active groups on nylon fibers. It is well known that acid dyes can combine with amino groups in the nylon molecular chain through ionic bonds to produce vibrant colors, but the binding force between dyes and fabrics is relatively weak, making it difficult to ensure wet fastness. Chang Guangtao et al. proposed an inkjet printing method for nylon 66 fabrics using ionic liquid-modified acid dyes, but the printed fabrics exhibited low wash fastness and low color depth. Although disperse dyes can easily diffuse into the amorphous and even crystalline regions of nylon, forming a physical binding mode with nylon fibers due to their non-polar properties, their fixation rate is low and the colors are dull.

[0004] Currently, research on nylon inkjet printing mainly focuses on single sizing agents. For example, patent CN116516700A discloses a pretreatment process for nylon inkjet printing, using a sizing agent with moderate viscosity. The inkjet-printed fabric exhibits advantages such as high color vibrancy, good colorfastness, good wash and abrasion resistance, and good anti-bleeding effect. Patent CN119121662B discloses a high-fixation direct-to-garment digital printing process for nylon, using a modified lignin-based fixing agent to effectively promote dye uptake and strengthen the bond between the dye and the fabric. The processes described above do not involve the compounding process of nylon sizing agents and acid / disperse dye inks. Summary of the Invention

[0005] The main objective of this invention is to address the aforementioned problems by providing a method for inkjet printing on nylon fabric using a blended acid / disperse dye digital printing ink. First, the nylon fabric is pre-treated with a blended sizing agent. Then, acid and disperse dyes are blended. By adjusting the inkjet parameters, the blended digital printing ink is obtained. Finally, inkjet printing is performed on the nylon fabric. This acid / disperse dye blended digital printing ink offers advantages such as high efficiency, convenience, and high clarity, providing a practical solution for high-quality nylon inkjet printing and expanding its application prospects in the textile industry.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] A method for inkjet printing on nylon using a digital printing ink formulated with acid / disperse dyes includes the following steps:

[0008] (1) The nylon fabric is pre-treated by sizing with pre-treatment sizing agent and then dried;

[0009] (2) Acid dyes and disperse dyes are compounded, and humectants, binders, surface tension modifiers and water are added. The inkjet parameters are adjusted and filtered through a filter membrane to obtain compound digital printing ink.

[0010] (3) The nylon fabric is printed by inkjet printing using compound digital printing ink and then dried to obtain inkjet printed nylon fabric.

[0011] More preferably, in step (1), the pretreated slurry comprises the following components in weight percentage: HPMC / SA 0.5-5wt%, urea 1-5wt%, acetic acid 0.5-3wt%, and water balance.

[0012] More preferably, in the HPMC / SA, the mass ratio of hydroxypropyl methylcellulose (HPMC) to sodium alginate (SA) is 1:3-3:1.

[0013] The SA / HPMC blend ratio should not differ too much; 1:3 to 3:1 is more suitable. If the SA ratio is too high, it will be difficult to effectively control the degree of ink penetration. If the HPMC ratio is too high, a film will be formed on the fabric surface, and the hand feel and breathability will be greatly reduced.

[0014] More preferably, in step (1), the sizing pretreatment process is one dip and one roll or two dips and two rolls, the soaking time is 20-30 min, the pressure of the roller is 0.2-1 Pa, and the rotation speed is 1-3 m / min; the drying temperature is 60-100℃, and the drying time is 3-10 min.

[0015] More preferably, in step (2), the compound digital printing ink comprises the following components in weight percentage: 15-20 wt% acid dye / disperse dye, 0.01-0.1 wt% surface tension modifier, 15-25 wt% binder, 15-25 wt% humectant and water balance.

[0016] Humectants absorb moisture from the air to keep the ink moist, preventing it from drying out and clogging the printhead. They also have high viscosity, allowing for ink viscosity control. Surface tension modifiers regulate the ink's surface tension. Therefore, both humectants and surface tension modifiers can be used to control inkjet parameters. Adhesives have a bonding and color-fixing effect, firmly binding disperse dye particles to nylon fibers and improving the color fastness of printed fabrics.

[0017] More preferably, in the acid dye / disperse dye, the mass ratio of acid dye to disperse dye is 30-70 wt%: 30-70 wt%; even more preferably, in the acid dye / disperse dye, the mass ratio of acid dye to disperse dye is 30-40 wt%: 60-70 wt%.

[0018] More preferably, in step (2), the surface tension regulator is a nonionic alkynyl diol defoaming and wetting agent; the surface tension regulator is any one or more of 2,4,7,9-tetramethyl-5-decyn-4,7-diol and ethoxylated derivatives of 2,4,7,9-tetramethyl-5-decyn-4,7-diol (products of introducing an ethylene oxide chain (EO) into 2,4,7,9-tetramethyl-5-decyn-4,7-diol, including 3EO, 5EO and 10EO).

[0019] More preferably, in step (2), the adhesive is a water-based polyurethane adhesive.

[0020] More preferably, in step (2), the moisturizer is a small molecule alcohol moisturizer; the moisturizer is any one or more of glycerin, propylene glycol, diethylene glycol butyl ether, butanediol, and pentanediol.

[0021] More preferably, in step (2), the inkjet parameters are: the surface tension of the ink is controlled at 20-35 mN / m, and the viscosity is controlled at 3-7 cps.

[0022] More preferably, in step (3), the drying conditions are pre-drying at 80°C for 5-10 minutes, followed by baking at 150°C for 3-5 minutes.

[0023] In detail, the method for nylon inkjet printing using acid / disperse dye compound digital printing ink in this invention mainly includes the following steps:

[0024] (1) Sizing pretreatment of nylon fabric: Weigh 0.5-5wt% of HPMC / SA (HPMC to SA mass ratio of 1:3-3:1), 1-5wt% of urea, 0.5-3wt% of acetic acid and the balance of water, mix them thoroughly to prepare pretreatment sizing material, and perform one dip and one nib or two dip and two nib treatment on the nylon fabric. The soaking time is 20-30min, the pressure of the pressure roller is 0.2-1Pa, and the rotation speed is 1-3m / min. Then place it in an oven at 60-100℃ for 3-10min to dry.

[0025] (2) Blending and control of acid / disperse dye ink: Mix 15-25wt% acid dye / disperse dye (the mass ratio of acid dye to disperse dye is 30-70 wt%: 30-70 wt%), add 15-25wt% humectant, 15-25wt% binder and the balance water, and add 0.01-0.1wt% surface tension modifier to control the inkjet parameters (surface tension is 20-35mN / m, viscosity is controlled at 3-7cps), filter through a 1μm PVDF filter membrane to obtain the blended digital printing ink.

[0026] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-dry at 80℃ for 5-10 minutes, and then bake at 150℃ for 3-5 minutes to obtain the nylon inkjet printed fabric.

[0027] Compared with the prior art, the present invention has the following four advantages:

[0028] (1) This invention successfully developed a SA / HPMC compound pretreatment sizing agent for nylon, combining the advantages of both. SA does not form harmful bonds with acid dyes (meaning that the acid dye anions bind to SA through ionic bonds, preventing further diffusion into the fiber and binding with it), ensuring maximum dye uptake and maintaining a good hand feel for the nylon fabric. HPMC's excellent water retention and anti-bleeding capabilities slow down the drying speed of the ink and sizing film. This provides more time for acid dye molecules to migrate from the sizing film to the fiber surface, adsorb, and diffuse into the fiber, thereby significantly improving the dye uptake rate and resulting in deeper and brighter colors.

[0029] (2) The present invention successfully developed an acid / disperse dye compound digital printing ink, wherein the acid dye molecules first destroy part of the crystalline region, and then the disperse dye molecules fill the expanded amorphous region. The two have a synergistic effect to protect the fiber structure and enhance the resistance to deformation and damage. This synergistic effect together ensures the excellent color brightness, color depth and color fastness of the fabric.

[0030] (3) This invention has successfully developed a pretreatment and acid / disperse dye ink system suitable for inkjet printing of nylon textiles, providing a simple, practical, fast and efficient solution for high-quality nylon inkjet printing. It solves the industry problem that nylon digital inkjet printing products are difficult to achieve high color vibrancy, color depth and color fastness at the same time. It meets the needs of the times for textile development, has guiding significance for the field of nylon digital inkjet printing, and has great development potential and broad market prospects. Attached Figure Description

[0031] Figure 1 SEM images of nylon fabric after sizing pretreatment;

[0032] Figure 2 This is a schematic diagram illustrating the binding mechanism of acid / disperse dye inks to nylon fabrics.

[0033] Figure 3 K / S diagram for inkjet printing of nylon fabrics with red, yellow, blue, and black acid / disperse dye inks;

[0034] Figure 4 Image of nylon fabric printed with acid / disperse dye ink. Detailed Implementation

[0035] The following description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0037] Example 1

[0038] (1) Sizing pretreatment of nylon fabric: Weigh 2wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the remaining water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is then subjected to one dip and one roll treatment. The soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0039] (2) Blending and control of acid / disperse dye inks: 30 wt% disperse dye paste (25 wt% dye content) was mixed with 7.5 wt% acid dye to obtain 37.5 wt% mixed paste (total dye content 15 wt%, mass ratio of acid dye to disperse dye is 5:5); 15 wt% glycerol, 15 wt% waterborne polyurethane binder and the balance water were added to the 37.5 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0040] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0041] Example 2

[0042] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:3), 2wt% urea, 2wt% acetic acid and the remaining water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is then subjected to one dip and one roll treatment. The soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0043] (2) Blending and control of acid / disperse dye inks: 30 wt% disperse dye paste (25 wt% dye content) was mixed with 7.5 wt% acid dye to obtain 37.5 wt% mixed paste (total dye content 15 wt%, mass ratio of acid dye to disperse dye is 5:5); 15 wt% glycerol, 15 wt% waterborne polyurethane binder and the balance water were added to the 37.5 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0044] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0045] Example 3

[0046] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 3:1), 2wt% urea, 2wt% acetic acid and the remaining water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is then subjected to one dip and one roll treatment. The soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0047] (2) Blending and control of acid / disperse dye inks: 30 wt% disperse dye paste (25 wt% dye content) was mixed with 7.5 wt% acid dye to obtain 37.5 wt% mixed paste (total dye content 15 wt%, mass ratio of acid dye to disperse dye is 5:5); 15 wt% glycerol, 15 wt% waterborne polyurethane binder and the balance water were added to the 37.5 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0048] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0049] Example 4

[0050] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the remaining water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is then subjected to one dip and one roll treatment. The soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0051] (2) Blending and control of acid / disperse dye inks: 30 wt% disperse dye paste (25 wt% dye content) was mixed with 7.5 wt% acid dye to obtain 37.5 wt% mixed paste (total dye content 15 wt%, mass ratio of acid dye to disperse dye is 5:5); 15 wt% glycerol, 15 wt% waterborne polyurethane binder and the balance water were added to the 37.5 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0052] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0053] Example 5

[0054] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the remaining water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is then subjected to one dip and one roll treatment. The soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0055] (2) Blending and control of acid / disperse dye inks: 18wt% disperse dye paste (25wt% dye content) was mixed with 10.5wt% acid dye to obtain 28.5wt% mixed paste (total dye content 15wt%, mass ratio of acid dye to disperse dye is 7:3); 15wt% glycerol, 15wt% waterborne polyurethane binder and the balance water were added to the 28.5wt% mixed paste, and 0.01wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1μm PVDF filter membrane to obtain the blended digital printing ink.

[0056] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0057] Example 6

[0058] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the remaining water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is then subjected to one dip and one roll treatment. The soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0059] (2) Blending and control of acid / disperse dye inks: 42wt% disperse dye paste (25wt% dye content) was mixed with 4.5wt% acid dye to obtain 46.5wt% mixed paste (total dye content 15wt%, mass ratio of acid dye to disperse dye 3:7); 15wt% glycerol, 15wt% waterborne polyurethane binder and the balance water were added to the 46.5wt% mixed paste, and 0.01wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1μm PVDF filter membrane to obtain the blended digital printing ink.

[0060] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0061] Example 7

[0062] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the balance water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is subjected to two dips and two nips, the soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0063] (2) Blending and control of acid / disperse dye inks: 42wt% disperse dye paste (25wt% dye content) was mixed with 4.5wt% acid dye to obtain 46.5wt% mixed paste (total dye content 15wt%, mass ratio of acid dye to disperse dye 3:7); 15wt% glycerol, 15wt% waterborne polyurethane binder and the balance water were added to the 46.5wt% mixed paste, and 0.01wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1μm PVDF filter membrane to obtain the blended digital printing ink.

[0064] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0065] Example 8

[0066] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the balance water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is subjected to two dips and two nips, the soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0067] (2) Blending and control of acid / disperse dye inks: 56 wt% disperse dye paste (25 wt% dye content) was mixed with 6 wt% acid dye to obtain 62 wt% mixed paste (total dye content 20 wt%, mass ratio of acid dye to disperse dye 3:7); 15 wt% glycerol, 15 wt% waterborne polyurethane binder and the balance water were added to the 62 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0068] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0069] Example 9

[0070] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the balance water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is subjected to two dips and two nips, the soaking time is 30min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0071] (2) Blending and control of acid / disperse dye inks: 56 wt% disperse dye paste (25 wt% dye content) was mixed with 6 wt% acid dye to obtain 62 wt% mixed paste (total dye content 20 wt%, mass ratio of acid dye to disperse dye 3:7); 15 wt% glycerol, 15 wt% waterborne polyurethane binder and the balance water were added to the 62 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0072] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0073] Example 10

[0074] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the balance water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is subjected to two dips and two nips, the soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0075] (2) Blending and control of acid / disperse dye inks: 56 wt% disperse dye paste (25 wt% dye content) was mixed with 6 wt% acid dye to obtain 62 wt% mixed paste (total dye content 20 wt%, mass ratio of acid dye to disperse dye 3:7); 15 wt% glycerol, 20 wt% waterborne polyurethane binder and the balance water were added to the 62 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0076] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0077] Example 11

[0078] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the balance water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is subjected to two dips and two nips, the soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0079] (2) Blending and control of acid / disperse dye inks: 56 wt% disperse dye paste (25 wt% dye content) was mixed with 6 wt% acid dye to obtain 62 wt% mixed paste (total dye content 20 wt%, mass ratio of acid dye to disperse dye 3:7); 20 wt% glycerol, 15 wt% waterborne polyurethane binder and the balance water were added to the 62 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0080] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0081] Comparative Example 1

[0082] Compared to Example 11, Comparative Example 1 involves sizing and pretreating nylon with pure SA sizing agent.

[0083] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% SA, 2wt% urea, 2wt% acetic acid and the remaining water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is subjected to two dips and two nips. The soaking time is 20 min, the pressure of the roller is 0.5 Pa, the rotation speed is 2 m / min, and then it is placed in a 60℃ oven for 10 min to dry.

[0084] (2) Blending and control of acid / disperse dye inks: 56 wt% disperse dye paste (25 wt% dye content) was mixed with 6 wt% acid dye to obtain 62 wt% mixed paste (total dye content 20 wt%, mass ratio of acid dye to disperse dye 3:7); 20 wt% glycerol, 15 wt% waterborne polyurethane binder and the balance water were added to the 62 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0085] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0086] Comparative Example 2

[0087] Compared to Example 11, Comparative Example 2 involves sizing and pretreating nylon using pure HPMC sizing agent.

[0088] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC, 2wt% urea, 2wt% acetic acid and the remaining water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is subjected to two dips and two nips. The soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0089] (2) Blending and control of acid / disperse dye inks: 56 wt% disperse dye paste (25 wt% dye content) was mixed with 6 wt% acid dye to obtain 62 wt% mixed paste (total dye content 20 wt%, mass ratio of acid dye to disperse dye 3:7); 20 wt% glycerol, 15 wt% waterborne polyurethane binder and the balance water were added to the 62 wt% mixed paste, and 0.01 wt% 2,4,7,9-tetramethyl-5-decyn-4,7-diol was added. The mixture was filtered through a 1 μm PVDF filter membrane to obtain the blended digital printing ink.

[0090] (3) Nylon inkjet printing: Place the compound digital printing ink in the inkjet printer to print on the nylon fabric, pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain the nylon inkjet printed fabric.

[0091] Comparative Example 3

[0092] Comparative Example 3 involves inkjet printing on nylon using commercially available acid dye digital printing ink.

[0093] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the balance water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is subjected to two dips and two nips, the soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0094] (2) Nylon inkjet printing: Place commercially available acid dye digital printing ink (dye content: 15wt%) in an inkjet printer to print on nylon fabric. Pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain nylon inkjet printed fabric.

[0095] Comparative Example 4

[0096] Comparative Example 4 shows inkjet printing on nylon using commercially available disperse dye digital printing ink.

[0097] (1) Sizing pretreatment of nylon fabric: Weigh 4wt% HPMC / SA (HPMC to SA mass ratio of 1:1), 2wt% urea, 2wt% acetic acid and the balance water and mix them thoroughly to prepare pretreatment sizing. The nylon fabric is subjected to two dips and two nips, the soaking time is 20min, the pressure of the roller is 0.5Pa and the rotation speed is 2m / min. Then it is placed in a 60℃ oven for 10min to dry.

[0098] (2) Nylon inkjet printing: Place commercially available disperse dye digital printing ink (dye content: 15wt%) in an inkjet printer to print on nylon fabric. Pre-bake at 80℃ for 5 minutes, and then bake at 150℃ for 3 minutes to obtain nylon inkjet printed fabric.

[0099] Table 1. Performance of digital printing inks with different formulations of acid / disperse dye blends

[0100] Total dye mass percentage (wt%) Acid / Disperse Dye Ratio Adhesive (wt%) Glycerin (wt%) Surface tension (mN / m) Viscosity (cps) Example 4 15 5：5 15 15 28.5 3.36 Example 5 15 7：3 15 15 31.4 4.25 Example 6 15 3：7 15 15 31.8 2.86 Example 8 20 3：7 15 15 29.0 3.42 Example 10 20 3：7 20 15 24.8 4.21 Example 11 20 3：7 15 20 28.6 4.64 Comparative Example 3 15 10：0 - - 30.3 6.15 Comparative Example 4 15 0：10 - - 25.9 3.38

[0101] Table 2 Performance of Yellow Nylon Inkjet Printed Fabrics with Different Formulations

[0102] SA / HPMC Total slurry content (wt%) Soaking time Sizing method Acid / Disperse Dyes Total dye content (wt%) K / S Saturation Example 1 1：1 2 20 One soak and one roll 5：5 15 6.4 62.3 Example 2 3：1 4 20 One soak and one roll 5：5 15 6.6 67.1 Example 3 1：3 4 20 One soak and one roll 5：5 15 5.1 65.5 Example 4 1：1 4 20 One soak and one roll 5：5 15 5.8 64.3 Example 5 1：1 4 20 One soak and one roll 7：3 15 5.2 59.8 Example 6 1：1 4 20 One soak and one roll 3：7 15 8.9 63.4 Example 7 1：1 4 20 Two dips and two rolling processes 3：7 15 7.9 67.4 Example 8 1：1 4 20 Two dips and two rolling processes 3：7 20 11.2 77.2 Example 9 1：1 4 30 Two dips and two rolling processes 3：7 20 13.5 82.6 Example 10 1：1 4 20 Two dips and two rolling processes 3：7 20 11.7 78.8 Example 11 1：1 4 20 Two dips and two rolling processes 3：7 20 12.5 80.2 Comparative Example 1 1：0 4 20 Two dips and two rolling processes 3：7 20 10.5 75.5 Comparative Example 2 0：1 4 20 Two dips and two rolling processes 3：7 20 10.9 71.3 Comparative Example 3 1：1 4 20 One soak and one roll 10：0 15 3.6 54.1 Comparative Example 4 1：1 4 20 One soak and one roll 0：10 15 5.7 61.5

[0103] Table 1 shows that the physicochemical properties of the acid / disperse dye blended inks meet the requirements of inkjet printing inks. Table 2 shows that compared with single disperse dyes or acid dyes, nylon fabrics inkjet printed with acid / disperse dye blended inks have higher color depth (K / S) and saturation. Furthermore, when the acid / disperse dye blending ratio is 3:7, the inkjet-printed fabric exhibits even higher color depth and saturation. In addition, compared with a one-dip-one-nip sizing method, a two-dip-two-nip sizing method allows for a greater coverage of the fabric surface with sizing material, significantly improving inkjet printing quality. Higher dye content also enhances the color depth and saturation of the fabric.

[0104] like Figure 1 The SEM image of the nylon fabric after sizing pretreatment shown shows that sizing with SA / HPMC composite sizing agent can greatly preserve the original morphology of the nylon fibers.

[0105] like Figure 2The diagram illustrates the binding mechanism of acid / disperse dye inks to nylon fabrics. Disperse dyes are primarily adsorbed onto the surface of nylon fibers or limited amorphous regions through van der Waals forces and dipole interactions. Due to their small molecular size and weak binding force, they exhibit less resistance to molecular chain rearrangement compared to acid dyes. Some dyes may adsorb at the edges of crystalline regions, but without deeply disrupting the crystalline structure, thus maintaining a high level of crystallinity and limiting dye penetration. Furthermore, the fine grain size further enhances the light scattering effect, resulting in a duller color. For acid / disperse dye inks, the acid dyes disrupt some crystalline regions, providing more penetration channels for the disperse dyes to enter the fiber interior, resulting in a more uniform distribution and higher concentration of dye molecules within the fiber. Therefore, compared to single disperse dye inks or acid dye inks, acid / disperse dye blended inks exhibit stronger binding force to nylon fibers due to the synergistic effect of the two dyes. Additionally, the larger particles of disperse dyes reduce light scattering, resulting in deeper and brighter colors.

[0106] like Figure 3 The images shown are K / S images of inkjet printed nylon fabrics with different colors (red, yellow, blue, and black) of acid / disperse dye compound inks in Examples 4-6 and Comparative Examples 3-4. It can be seen that the printed fabric has the highest K / S value when the compound ratio is 3:7.

[0107] like Figure 4 As shown, from left to right, the inkjet-printed patterns of nylon prepared by Comparative Example 3, Example 7, and Comparative Example 4 are shown. It can be seen that the inkjet-printed patterns of nylon fabrics printed with acid / disperse dye compound ink are clear and free from bleeding.

[0108] Unless otherwise specified, the raw materials and equipment used in this invention are all commonly used in the field; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0109] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for inkjet printing nylon using a digital printing ink formulated with acid / disperse dyes, characterized in that, Includes the following steps: (1) The nylon fabric is pre-treated by sizing with pre-treatment sizing agent and then dried; (2) Acid dyes and disperse dyes are compounded, and humectants, binders, surface tension modifiers and water are added. The inkjet parameters are adjusted and filtered through a filter membrane to obtain compound digital printing ink. (3) The nylon fabric is printed by inkjet printing using compound digital printing ink and then dried to obtain inkjet printed nylon fabric.

2. The method for inkjet printing of nylon using acid / disperse dye compound digital printing ink as described in claim 1, characterized in that, In step (1), the pretreated slurry comprises the following components by mass percentage: HPMC / SA 0.5-5 wt%, urea 1-5 wt%, acetic acid 0.5-3 wt%, and water balance.

3. The method for inkjet printing of nylon using acid / disperse dye compound digital printing ink as described in claim 2, characterized in that, In the HPMC / SA, the mass ratio of hydroxypropyl methylcellulose to sodium alginate is 1:3-3:

1.

4. The method for inkjet printing nylon using acid / disperse dye compound digital printing ink as described in claim 1, 2, or 3, characterized in that, In step (1), the sizing pretreatment process is one dip and one roll or two dips and two rolls, the soaking time is 20-30 min, the pressure of the roller is 0.2-1 Pa, and the rotation speed is 1-3 m / min; the drying temperature is 60-100℃, and the drying time is 3-10 min.

5. The method for inkjet printing of nylon using acid / disperse dye compound digital printing ink as described in claim 1, characterized in that, In step (2), the compound digital printing ink comprises the following components by weight percentage: 15-20 wt% acid dye / disperse dye, 0.01-0.1 wt% surface tension modifier, 15-25 wt% binder, 15-25 wt% humectant and water balance.

6. The method for inkjet printing of nylon using acid / disperse dye compound digital printing ink as described in claim 5, characterized in that, In the acid dye / disperse dye, the mass ratio of acid dye to disperse dye is 30-70 wt%: 30-70 wt%.

7. The method for inkjet printing of nylon using acid / disperse dye compound digital printing ink as described in claim 1 or 5, characterized in that, In step (2), the humectant is a small molecule alcohol humectant; the surface tension modifier is a nonionic acetylenic diol defoaming and wetting agent; and the adhesive is a water-based polyurethane adhesive.

8. The method for inkjet printing of nylon using acidic / disperse dye compound digital printing ink as described in claim 1 or 5, wherein in step (2), the humectant is any one or more of glycerin, propylene glycol, diethylene glycol butyl ether, butanediol, and pentanediol.

9. The method for inkjet printing of nylon using acidic / disperse dye compound digital printing ink as described in claim 1, wherein in step (2), the inkjet parameters are: the surface tension of the ink is controlled at 20-35mN / m, and the viscosity is controlled at 3-7cps.

10. The method for inkjet printing of nylon using acidic / disperse dye compound digital printing ink as described in claim 1 or 9, wherein in step (3), the drying conditions are pre-drying at 80°C for 5-10 minutes and then baking at 150°C for 3-5 minutes.

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