Anti-staining spray-dyed fabric and preparation method thereof

Abstract

The invention relates to the field of textile printing and dyeing, in particular to an anti-staining spray-dyed fabric and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a spray-dyed fabric; s2, the spray-dyed fabric is mixed with fixation slurry for primary fixation, intermediate fabric is obtained, and the fixation slurry is prepared from a dyeing auxiliary, paste and water according to the mass ratio of (1-20): (50-80): (50-150); and S3, mixing the intermediate fabric with a color fixing solution, and carrying out secondary color fixing to obtain the anti-staining spray-dyed fabric. In the step S2, a specific amount of slurry locks moisture and provides a continuous and stable moist environment, and a dyeing auxiliary agent optimizes the surface reaction activity of the fabric, accelerates permeation of the dye into fabric fibers, improves the fixation rate of the dye and reduces dye contamination; and in the step S3, the fixation liquid is combined with the unreacted dye to seal the dye, so that the unreacted dye is precipitated, and the staining problem of the spray-dyed fabric is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of textile printing and dyeing, specifically to an anti-staining spray-dyed fabric and its preparation method. Background Technology

[0002] Dyeing methods such as dip dyeing and pad dyeing allow dyes to fully penetrate into the fiber with the help of a solution carrier, forming a more stable bond with the fiber functional groups, thereby significantly reducing the amount of residual dye and the risk of staining. However, these methods have a high degree of process complexity and require significant equipment investment.

[0003] Spray dyeing technology involves coating dye onto a fiber web and fixing the color at high temperatures. Compared to other waterless or low-water dyeing technologies, it has a simple process, low equipment cost, and produces fabrics with color-spun effects, resulting in good product quality and high added value.

[0004] However, due to the inherent nature of the spray dyeing process, the contact between dye and fiber is mainly physical adhesion. During the initial color fixation process, the diffusion and bonding efficiency of dye into the fiber is limited, resulting in some dye failing to form a stable bond with the fiber and remaining on the fiber surface as floating dye. Ultimately, this causes the fabric to have certain staining problems during subsequent processing or use. Summary of the Invention

[0005] In order to solve the problem of color staining in spray-dyed fabrics, the present invention provides an anti-staining spray-dyed fabric and its preparation method.

[0006] The first aspect of this invention protects a method for preparing an anti-staining spray-dyed fabric, wherein the preparation method includes the following steps:

[0007] S1, preparing spray-dyed fabric; S2, the spray-dyed fabric is mixed with a color-fixing paste for the first color fixation, resulting in an intermediate fabric. The color-fixing paste comprises dyeing auxiliaries, paste, and water in a mass ratio of (1-20):(50-80):(50-150); S3, the intermediate fabric is mixed with the fixing liquid for a second fixing process to obtain an anti-staining spray-dyed fabric.

[0008] In step S3 of this invention, after the second color fixation, there are also water washing and drying steps to obtain anti-staining spray-dyed fabric; the water washing and drying steps are conventional operations in the field, and the specific conditions can be adjusted according to actual needs.

[0009] In an alternative implementation, in step S2, the mixing is performed by steaming and color fixing.

[0010] In one optional embodiment, the conditions for evaporation and color fixing include: evaporation temperature of 100-110℃, evaporation humidity of 90%-100%, and evaporation time of 5-30 min.

[0011] In this invention, the evaporation and color fixing are carried out in an evaporation machine, and the evaporation humidity refers to the humidity of the evaporation machine.

[0012] The present invention utilizes the water-fixing properties of the slurry and specific steaming and fixing conditions to further fix the dye to the fiber and reduce dye contamination.

[0013] In one optional embodiment, the conditions for evaporation and color fixing include: evaporation temperature of 102-105℃, evaporation humidity of 95%-100%, and evaporation time of 10-15 min.

[0014] In one optional embodiment, the mass ratio of the dyeing auxiliary, the paste, and the water is (5-10):(70-80):(80-120).

[0015] In one alternative embodiment, the amount of the fixing paste used is 10-100 wt% based on the weight of the dyed fabric, and optionally 20-50 wt%.

[0016] In one alternative embodiment, the dyeing auxiliary includes an alkali, a hygroscopic agent, and a penetrant.

[0017] In one optional embodiment, the mass ratio of the alkali, hygroscopic agent and penetrant is (1-50):(1-50):(1-40).

[0018] In one optional embodiment, the alkaline agent includes at least one selected from sodium carbonate, sodium bicarbonate, sodium hydroxide, and sodium citrate.

[0019] In one alternative embodiment, the desiccant includes at least one of urea, ammonia, and triethylene glycol.

[0020] In one optional embodiment, the penetrant includes at least one of penetrant JFC, penetrant AEP, and penetrant OEP; optionally, it includes at least one of penetrant JFC-G, penetrant AEP-98, and penetrant OEP-70.

[0021] In one optional embodiment, the paste includes at least one of cellulose derivatives, synthetic pastes, seaweed polysaccharides and their salts, and optionally includes at least one of carboxymethyl cellulose, synthetic paste DS-20L, and sodium alginate, and more preferably sodium alginate.

[0022] In one optional embodiment, step S1, the preparation of the spray-dyed fabric includes the following steps: S11, Preparation of dye solution: Mix the dye, optional dyeing auxiliary agent and water to obtain the dye solution; S12, Fabric spraying: The dyeing liquid is sprayed onto the fibers, dried and collected, and then processed into sprayed yarn through drawing, roving and spinning, and finally woven to obtain sprayed fabric.

[0023] In this invention, the dye is a conventional dye in the art, including at least one of reactive dyes and direct dyes.

[0024] In step S11 of this invention, when adding the dyeing aid, the dye, dyeing aid, and water can be mixed together, or the dye and water can be mixed first, and then the dyeing aid can be added. The choice can be made according to actual needs.

[0025] In step S12 of this invention, the fiber is a conventional fiber in the art, typically and non-limitingly, the fiber includes at least one of cotton, lyocell fiber, and Tencel fiber; the weaving is a conventional weaving method in the art, typically and non-limitingly, it can be machine-woven or knitted.

[0026] In one optional embodiment, the dye content, based on the dye liquor, is 0.01-50 wt%, optionally 0.01-5 wt%; the concentration of the auxiliary dye is 0-60 g / L.

[0027] In one alternative embodiment, the dyeing aid includes a salt-type aid, an alkali agent, and a penetrant.

[0028] In this invention, when preparing the dyeing solution, the auxiliary dyeing agents can be added together, or the salt-type auxiliary agent can be added first, followed by the alkali agent, and finally the penetrant. The specific method depends on the actual situation, and the solution should be mixed evenly.

[0029] In one optional embodiment, the mass ratio of the salt-type additive, the alkali agent, and the penetrant is (0-100):(0-50):(0-100).

[0030] In one optional embodiment, the salt-type additive includes at least one of sodium chloride and sodium sulfate.

[0031] In one optional embodiment, the alkali agent includes at least one selected from sodium carbonate, sodium bicarbonate, sodium formate, sodium acetate, and sodium hydroxide.

[0032] In one optional embodiment, the penetrant ' includes at least one of penetrant JFC, penetrant AEP, and penetrant OEP, and optionally includes at least one of penetrant JFC-G, penetrant AEP-98, and penetrant OEP-70.

[0033] In one optional embodiment, the spraying conditions include: a nozzle pressure of 0.2-1 MPa, a magnetic pump operating speed of 1-50 Hz, and a fiber web running speed of 5-90 m / min.

[0034] In one alternative implementation, the drying process includes primary drying, secondary drying, and tertiary drying.

[0035] In one optional embodiment, the temperature of the first drying step is 50-65°C, and the time is 30-60 seconds.

[0036] In one optional embodiment, the secondary drying temperature is 65-80°C and the time is 30-60 seconds.

[0037] In one optional embodiment, the temperature of the three drying cycles is 80-100°C and the time is 30-60 seconds.

[0038] In this invention, the low temperature of the first drying stage ensures that the dye liquor fully penetrates into the fiber; the medium temperature of the second drying stage allows the dye to be fixed; and the temperature of the third drying stage evaporates excess moisture, ensuring that subsequent processing can proceed.

[0039] In one optional implementation, in step S3, the fixing solution includes a fixing agent and water.

[0040] In one alternative embodiment, the concentration of the fixing agent is 5-50 g / L, based on the fixing solution.

[0041] In one optional embodiment, the fixing agent includes at least one of cationic fixing agents and nonionic fixing agents, and may include at least one of cationic fixing agent TY-XS088, cationic fixing agent polydimethyldiallylammonium chloride, cationic fixing crosslinking agent DE, nonionic fixing agent GL-320 and nonionic fixing agent RG-GS99A.

[0042] In one optional implementation, in step S3, the mixing conditions include: a mixing temperature of 60-80°C and a liquid carryover rate of 70-100%.

[0043] In this invention, the liquid carry-over rate refers to the percentage of the weight of liquid carried by the fabric after being rolled by the rollers to the weight of the fabric before rolling.

[0044] A second aspect of this invention protects an anti-staining spray-dyeing fabric prepared by the aforementioned preparation method.

[0045] The technical solution of this invention has the following advantages: 1. This invention provides a method for preparing an anti-staining spray-dyed fabric, wherein the preparation method includes the following steps: S1, preparing a spray-dyed fabric; S2, mixing the spray-dyed fabric with a color-fixing slurry for a first color fixation to obtain an intermediate fabric, wherein the color-fixing slurry includes a dyeing auxiliary agent, a paste, and water in a mass ratio of (1-20):(50-80):(50-150); S3, mixing the intermediate fabric with a color-fixing solution for a second color fixation to obtain an anti-staining spray-dyed fabric; In step S1 of this invention, preparing the spray-dyed fabric achieves the coloring of the fabric; in step S2, specifically... The synergistic effect of a fixed amount of dyeing auxiliaries, paste, and water can stabilize the surface humidity of the fabric. The water-locking properties of the paste lock in moisture, creating a continuously stable humid environment for the combination reaction between the dyeing auxiliaries and the fabric. At the same time, the dyeing auxiliaries can optimize the surface reactivity of the fabric, accelerate the penetration of dye into the fabric fibers, improve the dye fixation rate, and reduce dye staining. In step S3, the intermediate fabric is mixed with the fixing solution, and the fixing solution combines with the unreacted dye to seal the dye end, causing the unreacted dye to precipitate and remove residual floating color, effectively solving the staining problem of spray-dyed fabrics.

[0046] 2. When sodium alginate is used in the paste of this invention, it has a better effect than other pastes because sodium alginate molecules have a large number of carboxyl groups (-COOH) that can interact with functional groups (such as hydroxyl groups) in the fabric.

[0047] 3. In this invention, the low temperature of the first drying stage ensures that the dye liquor fully penetrates into the fiber; the medium temperature of the second drying stage allows the dye to be fixed; and the temperature of the third drying stage can evaporate excess moisture, ensuring that subsequent processing can be carried out. Detailed Implementation

[0048] The following embodiments are provided to better understand the present invention, but the following embodiments do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the scope of protection of the present invention.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having” and any variations thereof in the text of this application are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, the technical terms "first", "second", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the specific range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers from a to b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed herein, and "0-5" is merely a shortened representation of these numerical combinations. Furthermore, when a parameter is described as an integer ≥ 2, it is equivalent to disclosing that the parameter can be, for example, integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0053] In the description of the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0054] In the description of the embodiments of this application, the term "at least one" refers to one or more (including two).

[0055] Unless otherwise specified, all experimental steps or conditions in the examples were performed according to conventional experimental procedures and conditions in the art. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0056] The company that purchased Active Red 198 was Shaanxi Didu Pharmaceutical Chemical Co., Ltd. The company that purchased the penetrant JFC-G was Wuhan Kangqiong Biomedical Technology Co., Ltd. The company directly acquired by Huang R is Shanghai Mairui Biochemical Technology Co., Ltd. The company that purchased the penetrant AEP-98 was Shandong Zhenquan Environmental Protection Technology Co., Ltd. The company that purchased Reactive Brilliant Blue was Hebei Shunduo Chemical Co., Ltd. The penetrant OEP-70 was purchased from Jiangsu Haian Petrochemical Plant. The company that purchased the polydimethyldiallylammonium chloride was Jiangsu Bost Chemical Technology Co., Ltd. The color-fixing agent TY-XS088 was purchased from Dongguan Taiyang New Material Technology Co., Ltd. The color-fixing agent RG-GS99A was purchased from Weifang Ruiguang Chemical Co., Ltd.

[0057] Example 1 This embodiment provides a method for preparing an anti-staining spray-dyed fabric, comprising the following steps: S1, preparing spray-dyed fabric, specifically... S11, Preparation of dye solution: Weigh Reactive Red 198 and mix with water, add sodium chloride, then add sodium bicarbonate, and finally add penetrant JFC-G to obtain the dye solution. Based on the dye solution, the mass percentage of Reactive Red 198 is 1 wt%, the concentration of sodium chloride is 10 g / L, the concentration of sodium bicarbonate is 15 g / L, and the concentration of penetrant JFC-G is 5 g / L. S12, Fabric Spray Dyeing: Place the prepared dye solution in the dye solution cylinder, turn on the machine, and let the cotton web pass through the spray dyeing box. Spray the dye solution onto the cotton web. The nozzle pressure is set to 0.4MPa, the magnetic pump speed is set to 10Hz, and the cotton web running speed is 10m / min. Drying is carried out. The temperature of the first drying is 60℃ and the drying time is 30s; the temperature of the second drying is 70℃ and the drying time is 30s; the temperature of the third drying is 90℃ and the drying time is 30s. After drying, the fiber slivers are collected, and the spray dyed yarn is made by drawing, roving, and spinning. Then, the spray dyed fabric is woven. S2, apply a color-fixing paste to the spray-dyed fabric. The mass percentage of the color-fixing paste is 50wt% based on the spray-dyed fabric. The color-fixing paste consists of dyeing auxiliaries (sodium bicarbonate, urea, and penetrant JFC-G in a mass ratio of 2:5:10), sodium alginate, and water. The mass ratio of dyeing auxiliaries, sodium alginate, and water is 10:70:100. After coating, use a steaming machine to steam and fix the fabric. The steaming temperature is 102℃, the steaming humidity is 95%, and the steaming time is 10min to obtain an intermediate fabric. S3, prepare a fixing solution by mixing polydimethyldiallyl ammonium chloride and water. The concentration of polydimethyldiallyl ammonium chloride in the fixing solution is 10 g / L. Immerse the intermediate fabric in the fixing solution at a temperature of 70°C with a liquid retention rate of 100%. Then, wash and dry to obtain an anti-staining spray-dyed fabric.

[0058] Example 2 This embodiment provides a method for preparing an anti-staining spray-dyed fabric, comprising the following steps: S1, preparing spray-dyed fabric, specifically... S11, Preparation of dye solution: Weigh Direct Yellow R and mix with water, add sodium sulfate, and finally add penetrant AEP-98 to obtain the dye solution. The mass percentage of Direct Yellow R is 3 wt% based on the dye solution; the concentration of sodium sulfate is 15 g / L, and the concentration of penetrant AEP-98 is 10 g / L. S12, Fabric Spray Dyeing: Place the prepared dye solution in the dye solution cylinder, turn on the machine, and let the cotton web pass through the spray dyeing box. Spray the dye solution onto the cotton web. The nozzle pressure is set to 0.6MPa, the magnetic pump speed is set to 15Hz, and the cotton web running speed is 10m / min. Drying is carried out. The temperature of the first drying is 50℃ and the drying time is 30s; the temperature of the second drying is 80℃ and the drying time is 40s; the temperature of the third drying is 85℃ and the drying time is 30s. After drying, the fiber slivers are collected, and the spray-dyed yarn is made by drawing, roving, and spinning. Then, the spray-dyed fabric is woven. S2, apply a color-fixing paste to the spray-dyed fabric. The mass percentage of the color-fixing paste is 15wt% based on the spray-dyed fabric. The color-fixing paste consists of dyeing auxiliaries (sodium bicarbonate, urea, and penetrant AEP-98 in a mass ratio of 33:5:30), sodium alginate paste, and water. The mass ratio of dyeing auxiliaries, sodium alginate, and water is 15:55:120. After coating, use a steaming machine to steam and fix the fabric. The steaming temperature is 103℃, the steaming humidity is 97%, and the steaming time is 7 minutes to obtain an intermediate fabric. S3. Prepare a fixing solution by mixing fixing agent TY-XS088 with water. The concentration of fixing agent TY-XS088 in the fixing solution is 10g / L. Immerse the intermediate fabric in the fixing solution at a temperature of 60℃ with a liquid retention rate of 90%. Then wash and dry to obtain an anti-staining spray-dyed fabric.

[0059] Example 3 This embodiment provides a method for preparing an anti-staining spray-dyed fabric, comprising the following steps: S1, preparing spray-dyed fabric, specifically... S11, Preparation of dye solution: Weigh and mix Reactive Brilliant Blue and water, add sodium chloride, then add sodium acetate, and finally add OEP-70 penetrant to obtain the dye solution. The mass percentage of Reactive Brilliant Blue is 2 wt% based on the dye solution; the concentration of sodium chloride is 20 g / L, the concentration of sodium acetate is 20 g / L, and the concentration of OEP-70 penetrant is 15 g / L. S12, Fabric Spray Dyeing: Place the prepared dye solution in the dye solution cylinder, turn on the machine, and let the cotton web pass through the spray dyeing box. Spray the dye solution onto the cotton web. The nozzle pressure is set to 0.8MPa, the magnetic pump speed is set to 40Hz, and the cotton web running speed is 90m / min. Drying is carried out. The temperature of the first drying is 65℃ and the drying time is 30s; the temperature of the second drying is 65℃ and the drying time is 30s; the temperature of the third drying is 100℃ and the drying time is 30s. After drying, the fiber slivers are collected, and the spray-dyed yarn is made by drawing, roving, and spinning. Then, the spray-dyed fabric is woven. S2, apply a color-fixing paste to the spray-dyed fabric. The mass percentage of the color-fixing paste is 100wt% based on the spray-dyed fabric. The color-fixing paste consists of dyeing auxiliaries (sodium bicarbonate, urea, and penetrant OEP-70 in a mass ratio of 8:17:6), sodium alginate paste, and water. The mass ratio of dyeing auxiliaries, sodium alginate, and water is 5:70:80. After coating, use a steaming machine to steam and fix the fabric. The steaming temperature is 110℃, the steaming humidity is 97%, and the steaming time is 13min to obtain an intermediate fabric. S3. Prepare a fixing solution by mixing fixing agent RG-GS99A and water. The concentration of fixing agent RG-GS99A in the fixing solution is 10g / L. Immerse the intermediate fabric in the fixing solution at a temperature of 75℃ and a liquid retention rate of 75%. Then, wash and dry to obtain an anti-staining spray-dyed fabric.

[0060] Example 4 This embodiment provides a method for preparing an anti-staining spray-dyed fabric, comprising the following steps: The method is the same as in Example 1, except that in step S2, the mass ratio of the dyeing auxiliary agent, sodium alginate and water is 7:50:150.

[0061] Example 5 This embodiment provides a method for preparing an anti-staining spray-dyed fabric, comprising the following steps: The method is the same as in Example 1, except that in step S2, the evaporation temperature is 100°C, the evaporation humidity is 90%, and the evaporation time is 15 min.

[0062] Example 6 This embodiment provides a method for preparing an anti-staining spray-dyed fabric, comprising the following steps: The method is the same as in Example 1, except that in step S2, sodium alginate is replaced with carboxymethyl cellulose.

[0063] Example 7 This embodiment provides a method for preparing an anti-staining spray-dyed fabric, comprising the following steps: The method is the same as in Example 1, except that in step S2, the mass percentage of the fixing paste used is 70 wt% for the dyed fabric.

[0064] Example 8 This embodiment provides a method for preparing an anti-staining spray-dyed fabric, comprising the following steps: The method is the same as in Example 1, except that in step S12, the drying is performed only once, at a temperature of 120°C for 90 seconds.

[0065] Comparative Example 1 This comparative example provides a method for preparing a spray-dyed fabric, comprising the following steps: S1, preparing spray-dyed fabric; S11, Preparation of dyeing solution: Weigh Reactive Red 198 and mix with water, add sodium chloride, then add sodium bicarbonate, and finally add penetrant JFC-G to obtain the dyeing solution. The mass percentage of Reactive Red 198 is 1 wt% based on the dyeing solution; the concentration of sodium chloride is 10 g / L, the concentration of sodium bicarbonate is 15 g / L, and the concentration of penetrant JFC-G is 5 g / L. S12, Fabric Spray Dyeing: Place the prepared dye solution in the dye solution cylinder, turn on the machine, and let the cotton web pass through the spray dyeing box. Spray the dye solution onto the cotton web. The nozzle pressure is set to 0.4MPa, the magnetic pump speed is set to 10Hz, and the cotton web running speed is 10m / min. Drying is carried out. The temperature of the first drying is 60℃ and the drying time is 30s; the temperature of the second drying is 70℃ and the drying time is 30s; the temperature of the third drying is 90℃ and the drying time is 30s. After drying, the fiber slivers are collected, and the spray dyed yarn is made by drawing, roving, and spinning. Then, the spray dyed fabric is woven. S2, prepare a fixing solution by mixing polydimethyldiallyl ammonium chloride and water. The concentration of polydimethyldiallyl ammonium chloride in the fixing solution is 10 g / L. Immerse the spray-dyed fabric in the fixing solution at a temperature of 70°C with a liquid retention rate of 100%. Then, wash and dry to obtain an anti-staining spray-dyed fabric.

[0066] Comparative Example 2 This comparative example provides a method for preparing a spray-dyed fabric, comprising the following steps: S1, preparing spray-dyed fabric; S11, Preparation of dyeing solution: Weigh Reactive Red 198 and mix with water, add sodium chloride, then add sodium bicarbonate, and finally add penetrant JFC-G to obtain the dyeing solution. The mass percentage of Reactive Red 198 is 1 wt% based on the dyeing solution; the concentration of sodium chloride is 10 g / L, the concentration of sodium bicarbonate is 15 g / L, and the concentration of penetrant JFC-G is 5 g / L. S12, Fabric Spray Dyeing: Place the prepared dye solution in the dye solution cylinder, turn on the machine, and let the cotton web pass through the spray dyeing box. Spray the dye solution onto the cotton web. The nozzle pressure is set to 0.4MPa, the magnetic pump speed is set to 10Hz, and the cotton web running speed is 10m / min. Drying is carried out. The temperature of the first drying is 60℃ and the drying time is 30s; the temperature of the second drying is 70℃ and the drying time is 30s; the temperature of the third drying is 90℃ and the drying time is 30s. After drying, the fiber slivers are collected, and the spray dyed yarn is made by drawing, roving, and spinning. Then, the spray dyed fabric is woven. S2, apply a color-fixing paste to the spray-dyed fabric. The mass percentage of the color-fixing paste is 50 wt% based on the spray-dyed fabric. The color-fixing paste consists of dyeing auxiliaries (sodium bicarbonate, urea, and penetrant JFC-G in a mass ratio of 2:5:10), sodium alginate, and water. The mass ratio of dyeing auxiliaries, sodium alginate, and water is 10:70:100. After coating, use a steaming machine to steam and fix the fabric. The steaming temperature is 102℃, the steaming humidity is 95%, and the steaming time is 10 min to obtain an intermediate fabric.

[0067] Comparative Example 3 This comparative example provides a method for preparing a spray-dyed fabric, comprising the following steps: The method is the same as in Example 1, except that in step S2, the mass ratio of dyeing auxiliary agent, sodium alginate and water is 20:40:200.

[0068] Experimental Example The test method for color fastness grade is as follows: Collect the anti-staining spray-dyed fabrics prepared in the examples and comparative examples, sew the standard cotton lining fabric onto the fabric to obtain the test sample, and wash the test sample sequentially with 60℃ hot water for 1 min (the water completely covers the test sample), and then wash with 80℃ hot water soap (using standard soap flakes for textile washability, purchased from Hangzhou Dewei Instrument Technology Co., Ltd., with a soap concentration of 5g / L) for 5 min (the water completely covers the test sample). After rinsing with cool water for 3 min, separate the two and dry them. The standard cotton lining fabric is graded according to GB / T 251-2008 "Textiles - Tests for Color Fastness - Assessment of Staining - Gray Scale". Specific test data are shown in Table 1; Table 1

[0069] In step S1 of this invention, the fabric is prepared to achieve coloring. In step S2, a specific amount of dyeing auxiliary agent, paste, and water work synergistically to stabilize the surface humidity of the fabric. The water-locking properties of the paste lock in moisture, creating a continuously stable humid environment for the combination reaction between the dyeing auxiliary agent and the fabric. At the same time, the dyeing auxiliary agent can optimize the surface reactivity of the fabric, accelerate the penetration of dye into the fabric fibers, improve the dye fixation rate, and reduce dye staining. In step S3, the intermediate fabric is mixed with the fixing solution, and the fixing solution combines with the unreacted dye to seal the dye, causing the unreacted dye to precipitate and remove residual floating color, effectively solving the staining problem of the spray-dyed fabric.

[0070] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing an anti-staining spray-dyed fabric, characterized in that, The preparation method includes the following steps: S1, preparing spray-dyed fabric; S2, the spray-dyed fabric is mixed with a color-fixing paste for the first color fixation, resulting in an intermediate fabric. The color-fixing paste comprises dyeing auxiliaries, paste, and water in a mass ratio of (1-20):(50-80):(50-150); S3, the intermediate fabric is mixed with the fixing liquid for a second fixing process to obtain an anti-staining spray-dyed fabric.

2. The preparation method according to claim 1, characterized in that, In step S2, the mixing process employs evaporation for color fixation. Optionally, the conditions for evaporation and color fixing include: evaporation temperature of 100-110℃, evaporation humidity of 90%-100%, and evaporation time of 5-30 min; Optionally, the conditions for evaporation and color fixing include: evaporation temperature of 102-105℃, evaporation humidity of 95%-100%, and evaporation time of 10-15 min.

3. The preparation method according to claim 1 or 2, characterized in that, The mass ratio of the dyeing auxiliary agent, paste and water is (5-10):(70-80):(80-120); Optionally, the amount of the fixing paste used is 10-100 wt% based on the amount of the spray-dyed fabric, and optionally 20-50 wt%.

4. The preparation method according to any one of claims 1-3, characterized in that, The dyeing auxiliaries include alkali agents, hygroscopic agents, and penetrants; Optionally, the mass ratio of the alkali agent, hygroscopic agent and penetrant is (1-50):(1-50):(1-40); Optionally, the alkaline agent includes at least one of sodium carbonate, sodium bicarbonate, sodium hydroxide, and sodium citrate; Optionally, the desiccant includes at least one of urea, ammonia, and triethylene glycol; Optionally, the penetrant includes at least one of penetrant JFC, penetrant AEP, and penetrant OEP; or optionally, at least one of penetrant JFC-G, penetrant AEP-98, and penetrant OEP-70. Optionally, the paste includes at least one of cellulose derivatives, synthetic pastes, seaweed polysaccharides and their salts, and may include at least one of carboxymethyl cellulose, synthetic paste DS-20L, and sodium alginate, and may further be sodium alginate.

5. The preparation method according to any one of claims 1-4, characterized in that, In step S1, the preparation of the spray-dyed fabric includes the following steps: S11, Preparation of dye solution: Mix the dye, optional dyeing auxiliary agent and water to obtain the dye solution; S12, Fabric spraying: The dyeing liquid is sprayed onto the fibers, dried and collected, and then processed into sprayed yarn through drawing, roving and spinning, and finally woven to produce sprayed fabric.

6. The preparation method according to claim 5, characterized in that, The dye content, based on the dye liquor, is 0.01-50 wt% by mass, and the concentration of the auxiliary dye is 0-60 g / L. Optionally, the dyeing auxiliaries include salt-type auxiliaries, alkali agents, and penetrants; Optionally, the mass ratio of the salt-type auxiliary agent, the alkali agent, and the penetrant is (0-100):(0-50):(0-100); Optionally, the salt-type auxiliary agent includes at least one of sodium chloride and sodium sulfate; Optionally, the alkaline agent includes at least one of sodium carbonate, sodium bicarbonate, sodium formate, sodium acetate, and sodium hydroxide; Optionally, the penetrant ' includes at least one of penetrant JFC, penetrant AEP, and penetrant OEP, and may optionally include at least one of penetrant JFC-G, penetrant AEP-98, and penetrant OEP-70.

7. The preparation method according to claim 5, characterized in that, The spraying conditions include: a nozzle pressure of 0.2-1 MPa, a magnetic pump operating speed of 1-50 Hz, and a fiber web running speed of 5-90 m / min. Optionally, the drying process includes primary drying, secondary drying, and tertiary drying. Optionally, the temperature of the first drying step is 50-65℃ and the time is 30-60 seconds; Optionally, the secondary drying temperature is 65-80℃ and the time is 30-60s; Optionally, the temperature of the three drying processes is 80-100℃, and the time is 30-60s.

8. The preparation method according to any one of claims 1-7, characterized in that, In step S3, the fixing solution includes a fixing agent and water; Optionally, the concentration of the fixing agent is 5-50 g / L, based on the amount of fixing solution. Optionally, the fixing agent includes at least one of cationic fixing agents and nonionic fixing agents, and may include at least one of cationic fixing agent TY-XS088, cationic fixing agent polydimethyldiallylammonium chloride, cationic fixing crosslinking agent DE, nonionic fixing agent GL-320 and nonionic fixing agent RG-GS99A.

9. The preparation method according to any one of claims 1-8, characterized in that, In step S3, the mixing conditions include: a mixing temperature of 60-80°C and a liquid carryover rate of 70-100%.

10. The anti-staining spray-dyeing fabric prepared by the preparation method according to any one of claims 1-9.

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