Reactive dyeing method for spandex textiles

Abstract

The invention provides a method for dyeing spandex textiles with reactive dyes, wherein a solvent system suitable for dyeing spandex textiles is used to uniformly disperse reactive dyes to prepare dye liquor, and then the spandex textiles treated with pre-stretching or tension relaxation are dyed. The solvent system includes a binary solvent system of a water-soluble monohydric alcohol organic solvent and water; a water-insoluble halogenated hydrocarbon organic solvent may also be added to form a ternary solvent system. The solvent system of the dye liquor of the invention can make the reactive dye molecules in the dye liquor significantly aggregate, making it easier to enter the interior of the spandex; and the solvent system has excellent wettability, which is more conducive to the combination of reactive dyes and spandex. The method has a short process time and a low dyeing temperature, and will not damage the internal structure of the spandex. The dyed spandex product has good color fastness and color uniformity; and no auxiliary agent needs to be added during the dyeing process, which reduces energy consumption and wastewater discharge, and has the advantages of being green and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of textile dyeing, in particular to a method for dyeing spandex textiles with reactive dyes. Background Art

[0002] Spandex is the abbreviation of polyurethane fiber, which is a synthetic elastic fiber with high elongation at break, low modulus and high elastic recovery. Although my country's spandex industry started late, with the continuous development of technology and production scale, spandex is used more and more widely. Spandex is mainly used for textiles such as yarn knitting and weaving, and is also used in sanitary products and medical fields; with the development of spandex differentiation, its application range is also expanding. When spandex is widely used in the field of clothing, it is usually blended with other fibers to increase the elasticity of the fabric and improve the comfort of wearing clothes. Therefore, in recent years, the content of spandex in fabrics has continued to increase; its products are more and more widely used in the textile field because they are comfortable to wear, highly elastic, and have no sense of restraint.

[0003] Spandex textiles have many excellent properties, but in terms of dyeing performance, the dye uptake and color fastness of spandex textiles do not meet the dyeing requirements; blending with other fibers will result in uneven colors. Especially when mixed with cotton and dyed with dark tones, the color difference is particularly obvious. In order to improve the dyeing effect of spandex textiles, extreme dyeing conditions are often used, including increasing temperature, pressure, alkalinity, etc., but this method will affect the structure and performance of the fabric. Therefore, the problem of spandex's difficulty in dyeing seriously restricts the application of spandex in high-end fabrics and clothing with high spandex content.

[0004] At present, the methods for dyeing spandex textiles include: (1) dyeing with weak acid dyes. The carbamate group in spandex can provide a dyeing base for the weak acid dye, which can dye to a certain color, but cannot achieve darker colors. (2) Cationic dyeing. Studies have found that cationic dyes are not easy to dye spandex. (3) Spandex solution coloring. This method has the disadvantages of complex process, high cost, and high equipment requirements. (4) Chemical or physical modification methods mainly include: adding a dyeing enhancer to form a uniform and stable mixing system with the spinning solution to increase the dyeing base content; introducing new dyeable groups to modify the spandex fiber; changing the termination method of the solution polymerization to increase the chain end group content. The disadvantages of this method are that the process is complex, it destroys the spandex molecular chain structure, and affects the fiber performance and subsequent weaving and use. (5) Spandex is dyed with reactive dyes under alkaline conditions, using reactive dyes to undergo nucleophilic substitution or nucleophilic addition reactions with functional groups such as hydroxyl groups. However, this method requires very high concentrations of alkaline solution, which increases costs. In addition, spandex is negatively charged under alkaline conditions and repel reactive dyes. Therefore, the reactive dyes used in this method have a poor dyeing effect on spandex.

[0005] In view of this, it is necessary to design an improved reactive dyeing method for spandex textiles to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a method for dyeing spandex textiles with reactive dyes, wherein the spandex textiles are dyed by uniformly dispersing reactive dyes to prepare dye liquor using a dye liquor solvent system suitable for dyeing spandex textiles. The dyeing rate and color fastness of the spandex textiles dyed by the method are significantly improved, thereby overcoming the disadvantage that conventional reactive dyes cannot dye spandex textiles.

[0007] To achieve the above-mentioned object of the invention, the present invention provides a method for dyeing spandex textiles with reactive dyes, comprising the following steps:

[0008] S1. Pretreatment of spandex textiles

[0009] The spandex textile is washed with deionized water at room temperature, and dried at a temperature of 10 to 60° C. to obtain the spandex textile to be dyed;

[0010] S2. Dye solution preparation

[0011] The method comprises dispersing a reactive dye in a mixed solvent comprising water and an organic solvent at room temperature, and stirring the mixed solvent to obtain a dye liquor of the reactive dye; wherein the organic solvent comprises a water-soluble monohydric alcohol organic solvent or a mixture of a water-soluble monohydric alcohol organic solvent and a water-insoluble halogenated hydrocarbon organic solvent, and the weight percentage (owf) of the reactive dye relative to the spandex textile to be dyed is 0.01% to 20%;

[0012] S3. Staining

[0013] The spandex textile to be dyed prepared in step S1 is subjected to a pre-stretching treatment, and the pre-stretched spandex textile is immersed in the dye solution prepared in step S2 for dyeing to obtain a dyed spandex textile; wherein the pre-stretching multiple is 1.1 to 2 times, the dyeing time is 30 to 120 minutes, and the dyeing temperature is 1 to 90° C.;

[0014] S4. Post-processing

[0015] The dyed spandex textile obtained in step S3 is washed with deionized water to remove the floating color on the surface of the spandex textile, and then dried to obtain a dyed finished product.

[0016] As a further improvement of the present invention, in step S2, the volume ratio of water in the dye liquor to the organic solvent is 1%:99% to 50%:50%.

[0017] As a further improvement of the present invention, the volume ratio of water in the dye liquor to the organic solvent is 5%:95% to 20%:80%.

[0018] As a further improvement of the present invention, the water-soluble monohydric alcohol organic solvent is one of ethanol and isopropanol, and a binary solvent system of ethanol and water or a binary solvent system of isopropanol and water is formed in the dye solution.

[0019] As a further improvement of the present invention, in step S2, the water-insoluble halogenated hydrocarbon organic solvent includes one of carbon tetrachloride and tetrachloroethylene, and forms a ternary solvent system with the water-soluble monohydric alcohol organic solvent and water in the dye solution; specifically including a ternary solvent system of carbon tetrachloride / ethanol / water, a ternary solvent system of tetrachloroethylene / ethanol / water, a ternary solvent system of carbon tetrachloride / isopropanol / water, and a ternary solvent system of tetrachloroethylene / isopropanol / water.

[0020] As a further improvement of the present invention, in the mixture of the water-soluble monohydric alcohol organic solvent and the water-insoluble halogenated hydrocarbon organic solvent, the volume ratio of the water-soluble monohydric alcohol organic solvent to the water-insoluble halogenated hydrocarbon organic solvent is 1%:99% to 99%:1%.

[0021] According to the reactive dye dyeing method for spandex textiles described in any one of the above items, in step S2, the dye liquor is prepared by: dissolving the reactive dye in water, dispersing the reactive dye in the organic solvent, and stirring until the reactive dye is evenly dispersed in the organic solvent to obtain the dye liquor; or first preparing a mixed solvent of water and the organic solvent, and dispersing the reactive dye in the mixed solvent.

[0022] As a further improvement of the present invention, the spandex textile is spandex filament, spandex woven fabric, spandex knitted fabric or spandex nonwoven fabric; when the spandex textile is spandex woven fabric, spandex knitted fabric or spandex nonwoven fabric:

[0023] Step S3, subjecting the spandex textile to be dyed after the pretreatment in step S1 to relaxation treatment, and immersing the relaxed spandex textile in the dye solution prepared in step S2 for dyeing, to obtain a dyed spandex textile; wherein the relaxation treatment is to allow the spandex textile to be dyed to stand at room temperature for 12 to 24 hours or to place it in water vapor for 1 to 3 hours; the dyeing reaction time is 30 to 120 minutes, and the temperature is 1 to 90°C.

[0024] As a further improvement of the present invention, in step S2, the reactive dye is one or more of monochlorotriazine type reactive dye, dichlorotriazine type reactive dye, vinyl sulfone type reactive dye, and double reactive base type reactive dye.

[0025] The beneficial effects of the present invention are:

[0026] 1. The reactive dye dyeing method of spandex textile provided by the present invention is to prepare a reactive dye solution by uniformly dispersing the reactive dye in water, and then add the reactive dye solution to a poor organic solvent for the reactive dye; or to prepare a mixed solvent of water and a poor organic solvent for the reactive dye, and disperse the reactive dye in the mixed solvent system; both methods make the reactive dye precipitate and aggregate uniformly, so that when the spandex textile is dyed, the reactive dye enters the interior of the spandex in the form of agglomeration, and can achieve a better dyeing effect than the reactive dye solution in the form of dye molecules. The present invention overcomes the problem that spandex is not easy to dye in the prior art, and cleverly uses water-soluble reactive dyes to achieve reactive dye dyeing of spandex. In addition, the organic solvent used in the present invention can also achieve a certain swelling of the spandex, thereby improving the adsorption rate and fixation fastness of the dye. The present invention expands the dyeing pathway of spandex, and can produce spandex products with rich colors. In addition, the dyeing process time of the method is short, the dyeing temperature is low, and the fiber structure of the spandex will not be damaged; and no auxiliary agent needs to be added during the dyeing process, which reduces energy consumption, reduces costs, reduces wastewater discharge, and has the advantages of green environmental protection.

[0027] 2. In the present invention, the spandex filaments are pre-stretched and then dyed; the low-stretching treatment can control the micro-tension dyeing of the spandex filaments, increase the contact area with the dye solution, and improve the dyeing efficiency; and the low-stretching can improve the orientation of the spandex fiber, which is conducive to the further entry of the active dye into the fiber, breaking the adsorption balance and improving the fixation fastness of the dye activity in the spandex. The spandex woven fabric, spandex knitted fabric or spandex nonwoven fabric is subjected to a relaxation tension treatment to eliminate the tension during weaving and prevent uneven dyeing caused by the strong tension of the fabric during the dyeing process.

[0028] 3. The water-soluble monohydric alcohol organic solvent in the present invention has extremely strong hydrophilicity and can form a uniform solvent system with water; however, as a poor solvent for active dyes, when mixed with active dye solutions to prepare dye liquor, the active dyes can be gradually aggregated in the dye liquor. When the dye is dyed in an aggregated state, the difference in dye concentration between the inside and the surface of the spandex is high, and the dye is easier to enter the inside of the spandex. In addition, the water molecules in the solvent system form strong hydrogen bonds with the hydrophilic alcohol molecules, which also promotes the aggregation of the dye in the dye liquor. Compared with the pure water solvent system used in the traditional spandex dyeing method, the present invention uses a mixed solvent system of organic solvent and water, and the wettability of the dye liquor is better, the dye can quickly diffuse into the spandex, and it is more conducive to the combination of the dye and the spandex. Therefore, after the solvent system of the present invention dissolves the active dye, it can achieve better spandex dyeing, and the coloring rate is high and the dyeing effect is good.

[0029] 4. The reactive dye dyeing method of spandex textiles provided by the present invention can accelerate the absorption of dyes, eliminate the use of other auxiliaries, reduce the amount of water used in the dyeing process, lower the dyeing temperature, and improve the fixation of dyes in spandex by using a solvent system of organic solvents and water. In addition, the dyeing process obtains a dye solution with good permeability, and the spandex products after dyeing have good color fastness and color uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a K / S data diagram of the spandex after dyeing in Example 1 of the present invention.

[0031] Figure 2 The electron microscope images of the dyed spandex (b), (c) and the original spandex (a) according to Example 1 of the present invention, wherein (b) is reactive red 120 and (c) is reactive yellow 167.

[0032] Figure 3 This is a K / S data diagram of the spandex after dyeing in Examples 4-6 of the present invention.

[0033] Figure 4 This is a K / S data diagram of the spandex after dyeing in Example 7 of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0036] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0037] A reactive dye dyeing method for spandex textiles comprises the following steps:

[0038] S1. Pretreatment of spandex textiles

[0039] The spandex textile is washed at room temperature with deionized water to remove impurities and dust to avoid affecting the dyeing effect; and the spandex textile is dried at a temperature of 10 to 60° C. to obtain the spandex textile to be dyed;

[0040] S2. Dye solution preparation

[0041] The method comprises dispersing a reactive dye in a mixed solvent comprising water and an organic solvent at room temperature, and stirring the mixed solvent to obtain a reactive dye dye solution; or dissolving the reactive dye in water at room temperature, and then dispersing the mixed solvent in an organic solvent, and stirring the mixed solvent until the reactive dye is evenly dispersed in the organic solvent to obtain a dye solution; wherein the organic solvent comprises a water-soluble monohydric alcohol organic solvent or a mixture of a water-soluble monohydric alcohol organic solvent and a water-insoluble halogenated hydrocarbon organic solvent, the mass percentage (owf) of the reactive dye relative to the spandex textile to be dyed is 0.01% to 20%, and the concentration of the reactive dye in the dye solution is 10 to 1000 mg / L;

[0042] Specifically, the volume ratio of water to organic solvent in the dye liquor is 1%:99%-50%:50%; preferably, the volume ratio of water to organic solvent in the dye liquor is 5%:95%-20%:80%. The water-soluble monohydric alcohol organic solvent is one of ethanol and isopropanol, forming a binary solvent system of ethanol and water, or a binary solvent system of isopropanol and water in the dye liquor. The water-soluble monohydric alcohol organic solvent has extremely strong hydrophilicity, but as a poor solvent for active dyes, it causes the active dyes in the dye liquor to show obvious aggregation. In addition, during the dyeing process, the dye particles collide with the spandex fiber as the dye liquor is stirred, and almost all the dyes will be adsorbed on the fiber surface, resulting in a large dye concentration difference between the fiber surface and the inside of the fiber, which is conducive to the diffusion of dye particles into the fiber. In addition, the water molecules in the solvent system form strong hydrogen bonds with the hydrophilic alcohol molecules, and the hydrogen bond interaction between them will also promote the aggregation of the dye in the dye liquor. Based on the excellent permeability and less dye hydrolysis brought by the solvent system, the spandex dyed in the dye liquor obtains significantly higher dye uptake value and satisfactory color fastness.

[0043] In particular, in a mixture of a water-soluble monohydric alcohol organic solvent and a water-insoluble halogenated hydrocarbon organic solvent, the volume ratio of the water-soluble monohydric alcohol organic solvent to the water-insoluble halogenated hydrocarbon organic solvent is 1%:99% to 99%:1%. The water-insoluble halogenated hydrocarbon organic solvent includes one of carbon tetrachloride or tetrachloroethylene, which forms a ternary solvent system with a water-soluble monohydric alcohol organic solvent and water in the dye liquor. The ternary solvent system specifically includes a ternary solvent system of carbon tetrachloride / ethanol / water, a ternary solvent system of tetrachloroethylene / ethanol / water, a ternary solvent system of carbon tetrachloride / isopropanol / water, and a ternary solvent system of tetrachloroethylene / isopropanol / water. Both carbon tetrachloride and tetrachloroethylene have relatively low dielectric constants, and their addition reduces the dielectric constant of the dye liquor, reduces the surface tension, reduces the contact angle of the dye, and shortens the penetration time. Compared with the pure water system used in the traditional spandex dyeing method, the present invention adopts a solvent system of organic solvent and water, which has better wettability, and the dye can be quickly diffused into the spandex, which is more conducive to the combination of the dye and the spandex.

[0044] Preferably, the reactive dye is one or more of monochlorotriazine type reactive dye, dichlorotriazine type reactive dye, vinyl sulfone type reactive dye, and double reactive base type reactive dye. In a specific embodiment, the reactive dye can be CI reactive red 120, CI reactive yellow 167 or CI reactive blue 222.

[0045] S3. Staining

[0046] The spandex textile to be dyed prepared in step S1 is subjected to a pre-stretching treatment, and the pre-stretched spandex textile is immersed in the dye solution prepared in step S2 for dyeing to obtain a dyed spandex textile; wherein the pre-stretching multiple is 1.1 to 2 times, the dyeing time is 30 to 120 minutes, and the temperature is 1 to 90° C.;

[0047] Wherein, the spandex textile is spandex filament, spandex woven fabric, spandex knitted fabric or spandex non-woven fabric; when the spandex textile is spandex woven fabric, spandex knitted fabric or spandex non-woven fabric: step S3 is replaced by relaxing the tension treatment of the spandex textile to be dyed after the pretreatment in step S1, and immersing the relaxed spandex textile in the dye solution prepared in step S2 for dyeing reaction to obtain the dyed spandex textile; the relaxation treatment is to leave the spandex textile to be dyed at room temperature for 12 to 24 hours or to place it in water vapor for 1 to 3 hours; the dyeing reaction time is 30 to 120 minutes, and the temperature is 1 to 90°C.

[0048] S4. Post-processing

[0049] The dyed spandex textile obtained in step S3 is washed at room temperature with deionized water to remove the floating color on the surface of the spandex textile, and then dried to obtain a dyed finished product.

[0050] The invention provides a method for dyeing spandex textiles with reactive dyes. By adopting a binary solvent system of a monohydric alcohol organic solvent and water, or adding a water-insoluble halogenated hydrocarbon organic solvent to form a ternary solvent system with a water-soluble monohydric alcohol organic solvent and water, the absorption of the dye can be accelerated, the use of other auxiliaries can be eliminated, the amount of water used in the dyeing process can be reduced, the dyeing temperature can be lowered, and the fixation of the dye in the spandex can be improved. In addition, the dyeing process is used to obtain a dye solution with good permeability, and the spandex product after dyeing has good color fastness and color uniformity.

[0051] Example 1

[0052] Embodiment 1 provides a method for dyeing spandex textiles with reactive dyes, which specifically comprises the following steps:

[0053] S1. Spandex pretreatment: 10 g of untreated spandex was washed with deionized water at room temperature and dried at 40° C. to obtain the spandex to be dyed;

[0054] S2. Preparation of dye solution: Reactive dyes CI Reactive Red 120, CI Reactive Yellow 167 and CI Reactive Blue 222 are dissolved in a mixed solution of ethanol and water at room temperature, wherein the mass percentage (owf) of dye to spandex is 1%, and the volume ratio of water to ethanol is 10:90. After stirring evenly, red, yellow and blue dye solutions are obtained respectively.

[0055] S3, dyeing: pre-stretching the spandex to be dyed in step S1, with a drafting ratio of 1.5 times, and immersing the pre-stretched spandex in the dye solution obtained in step S2, and performing dyeing reaction at a temperature of 60° C. After 60 minutes, the spandex is taken out for washing and drying to obtain dyed spandex.

[0056] S4, post-treatment: washing the dyed spandex obtained in step S3 with deionized water at room temperature to remove the floating color on the surface of the spandex, and drying to obtain the finished product.

[0057] See also Figure 1 As shown, Figure 1 This is a K / S data diagram of the spandex after dyeing in Example 1. It can be seen from the figure that the K / S values ​​of the spandex after dyeing with different reactive dyes are different, and the spandex dyeing with reactive red has the best dyeing effect.

[0058] See also Figure 2 As shown, Figure 2 The electronic microscope images of the spandex (b), (c) and the original spandex (a) after dyeing in Example 1 of the present invention, wherein (b) is the spandex dyed with Reactive Red 120, and (c) is the spandex dyed with Reactive Yellow 167. It can be seen from the figure that the surface of the spandex after dyeing changes, which is due to the solution system and the aggregation state of the dye molecules in the solution system causing the change of the fiber surface structure; in addition, the interface between the dye and the fiber will also cause the spandex surface to change. This shows that the spandex in the solvent system of this method has a dyeing reaction.

[0059] Comparative Example

[0060] The comparative example provides a method for dyeing spandex, which is different from Example 1 in that the solvent system in step S2 contains only water without adding other solvents, and the rest is substantially the same as Example 1, which will not be described again.

[0061] Example 2

[0062] Example 2 provides a reactive dye dyeing method for spandex textiles. Compared with Example 1, the difference is that in step S2, the volume ratio of ethanol and water in the solvent system is 50:50, and the rest is roughly the same as Example 1, which will not be repeated here.

[0063] Example 3

[0064] Example 3 provides a reactive dye dyeing method for spandex textiles. Compared with Example 1, the difference is that in step S2, the solvent system is a ternary solvent system of ethanol, carbon tetrachloride and water, and the volume ratio of ethanol, carbon tetrachloride and water is 25:25:50. The rest is roughly the same as Example 1 and will not be repeated here.

[0065] The K / S values ​​of the spandex after dyeing of Comparative Example 1 and Examples 2-3 were tested, and the results were shown in the following table.

[0066] Table 1 K / S value of spandex after dyeing of Examples 1-3 and Comparative Example 1

[0067] Example Reactive Red Reactive Yellow Reactive Blue Example 1 5.3 2.8 4.1 Example 2 2.6 1.2 2.3 Example 3 3.2 1.8 2.5 Comparative Example 1 0.5 0.3 0.4

[0068] As shown in Table 1, in Comparative Example 1, only water is used as the solvent in the dye liquor, and the K / S value of spandex is extremely low, indicating that the dye hardly dyes the spandex fiber. However, through the invention, after adding ethanol or ethanol / carbon tetrachloride organic solvent, the K / S value of spandex is significantly improved.

[0069] Embodiment 4-6

[0070] Embodiment 4-6 provides a reactive dye dyeing method for spandex textiles. Compared with Embodiment 1, the difference lies in that, in step S2, the concentration of the dye in the dye solution is 10 mg / L, 30 mg / L, and 50 mg / L, respectively, and the owf of the corresponding dye is 0.01%, 0.03%, and 0.05%, respectively. The rest is roughly the same as Embodiment 1 and will not be repeated here.

[0071] See also Figure 3 The K / S data graph of spandex after dyeing of Examples 4-6 of the present invention is shown. It can be seen from the graph that at these three concentrations, the K / S of the spandex after dyeing is not high; however, no matter what the dye concentration is, the K / S value of the spandex after dyeing with the reactive dye of reactive red is the largest, indicating that its coloring effect is better than that of the other two reactive dyes.

[0072] Example 7

[0073] Example 7 provides a reactive dye dyeing method for spandex textiles. Compared with Example 1, the difference is that in step S3, the dyeing reaction is carried out at a temperature of 30° C. The rest is roughly the same as Example 1 and will not be repeated here.

[0074] See also Figure 4 As shown, Figure 4 This is a K / S data graph of spandex after dyeing according to Example 7 of the present invention. Compared with Example 1, the K / S of the spandex after dyeing at a temperature of 30°C is slightly lower, indicating that a temperature of 60°C is more conducive to the coloring of spandex by reactive dyes.

[0075] In summary, the present invention provides a method for dyeing spandex textiles with reactive dyes, wherein a dye liquor is prepared by dissolving reactive dyes in a dye liquor solvent system suitable for dyeing spandex textiles; or a mixed solvent of water and a poor organic solvent for reactive dyes is prepared, and the reactive dyes are dispersed in the mixed solvent to prepare the dye liquor; and the spandex textiles after pre-stretching or relaxation treatment are dyed. The solvent system of the dye comprises a binary solvent system of a water-soluble monohydric alcohol organic solvent and water; a water-insoluble halogenated hydrocarbon organic solvent may also be added to form a ternary solvent system with a water-soluble monohydric alcohol organic solvent and water. The solvent system used in the dye liquor of the present invention causes the reactive dyes to show obvious aggregation, and the dyes are easier to enter the interior of the spandex; and the water molecules in the solvent system form strong hydrogen bonds with the hydrophilic alcohol molecules, and the hydrogen bond interaction between them also promotes the aggregation of the dyes. In addition, the solvent system has excellent wettability, which is more conducive to the combination of the dye and spandex. The present invention adopts the dyeing process to obtain a dye liquor with good permeability, and the spandex product after dyeing has good color fastness and color uniformity. The dyeing process of this method is short in time and low in temperature, and will not damage the internal structure of spandex; and no auxiliaries need to be added during the dyeing process, which reduces energy consumption and wastewater discharge, and has the advantages of being green and environmentally friendly.

[0076] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for dyeing spandex textiles with reactive dyes, characterized in that: The following steps are involved: S1. Pretreatment of spandex textiles The spandex textile is washed with deionized water at room temperature, and dried at a temperature of 10 to 60° C. to obtain the spandex textile to be dyed; S2. Dye solution preparation The reactive dye is dispersed in a mixed solvent comprising water and an organic solvent at room temperature, and stirred to obtain a dye liquor of the reactive dye; wherein the organic solvent comprises a water-soluble monohydric alcohol organic solvent or a mixture of a water-soluble monohydric alcohol organic solvent and a water-insoluble halogenated hydrocarbon organic solvent, and the weight percentage (owf) of the reactive dye relative to the spandex textile to be dyed is 1% to 20%; and the volume ratio of water to the organic solvent in the dye liquor is 5%:95% to 20%:80%; S3. Staining The spandex textile to be dyed prepared in step S1 is subjected to a pre-stretching treatment, and the pre-stretched spandex textile is immersed in the dye solution prepared in step S2 for dyeing to obtain a dyed spandex textile; wherein the pre-stretching multiple is 1.1 to 2 times, the dyeing time is 30 to 120 minutes, and the temperature is 30 to 90° C.; S4. Post-processing The dyed spandex textile obtained in step S3 is washed with deionized water to remove the floating color on the surface of the dyed spandex textile, and then dried to obtain a dyed finished product.

2. The reactive dyeing method for spandex textiles according to claim 1, characterized in that: The water-soluble monohydric alcohol organic solvent is one of ethanol and isopropanol, and forms a binary solvent system of ethanol and water, or a binary solvent system of isopropanol and water in the dye solution.

3. The reactive dyeing method for spandex textiles according to claim 1, characterized in that: In step S2, the water-insoluble halogenated hydrocarbon organic solvent includes one of carbon tetrachloride and tetrachloroethylene, and forms a ternary solvent system with the water-soluble monohydric alcohol organic solvent and water in the dye solution; specifically including a ternary solvent system of carbon tetrachloride / ethanol / water, a ternary solvent system of tetrachloroethylene / ethanol / water, a ternary solvent system of carbon tetrachloride / isopropanol / water, and a ternary solvent system of tetrachloroethylene / isopropanol / water.

4. The reactive dyeing method for spandex textiles according to claim 3, characterized in that: In the mixture of the water-soluble monohydric alcohol organic solvent and the water-insoluble halogenated hydrocarbon organic solvent, the volume ratio of the water-soluble monohydric alcohol organic solvent to the water-insoluble halogenated hydrocarbon organic solvent is 1%:99% to 99%:1%.

5. The reactive dyeing method for spandex textiles according to any one of claims 1 to 4, characterized in that: In step S2, the dye solution is prepared by: dissolving the reactive dye in water, dispersing the reactive dye in the organic solvent, and stirring until the reactive dye is evenly dispersed in the organic solvent to obtain the dye solution; or first preparing a mixed solvent of water and the organic solvent, and dispersing the reactive dye in the mixed solvent.

6. The reactive dyeing method for spandex textiles according to claim 1, characterized in that: The spandex textile is spandex filament, spandex woven fabric, spandex knitted fabric or spandex nonwoven fabric; when the spandex textile is spandex woven fabric, spandex knitted fabric or spandex nonwoven fabric: Step S3, subjecting the spandex textile to be dyed after the pretreatment in step S1 to relaxation treatment, and immersing the relaxed spandex textile in the dye solution prepared in step S2 for dyeing, to obtain a dyed spandex textile; wherein the relaxation treatment is to allow the spandex textile to be dyed to stand at room temperature for 12 to 24 hours or to place it in water vapor for treatment for 1 to 3 hours; the dyeing reaction time is 30 to 120 minutes, and the temperature is 30 to 90°C.

7. The reactive dyeing method for spandex textiles according to claim 1, characterized in that: In step S2, the reactive dye is one or more of monochlorotriazine type reactive dye, dichlorotriazine type reactive dye, vinyl sulfone type reactive dye, and double reactive base type reactive dye.

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