Same-color dyeing method of multi-component wool fabric

Abstract

The invention provides a homochromatic dyeing method of a multi-component wool fabric, which comprises the following steps: carrying out dyeing pretreatment on a wool blended fabric to obtain a pretreated fabric; the pretreated fabric is dyed with a reactive dye for cotton and a dye auxiliary agent, the reactive dye for cotton comprises a reactive dye for cotton with iso-bifunctional groups, and a dyed fabric is obtained; and soaping the dyed fabric to obtain the same-color blended fabric. According to the dyeing method provided by the invention, the reactive dye with a specific structure is screened based on a one-bath dyeing method, and the pretreatment and post-treatment processes of the fabric are combined, so that the dyeing homochromatism and dyeing uniformity of the blended fabric containing wool are effectively improved, and the treated fabric has good dimensional stability and softness; the attractiveness and the grade of a fabric product are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of textile dyeing and finishing, and relates to a fabric dyeing method, in particular to a same-color dyeing method for multi-component wool fabric. Background Art

[0002] With the development of textile industry technology and the increase in people's demand for textile clothing, blended products with multi-component fibers have become a hot topic.

[0003] Conventional dyeing of wool blended fabrics is to select corresponding dyes according to the types of wool and its blended fibers. Wool is a protein fiber composed of amino acids. It contains a large number of amino, carboxyl, hydroxyl and other groups in its molecules. It can be dyed with acid dyes, metal complex dyes, reactive dyes and the like. Among them, reactive dyes can react chemically with amino groups in protein fibers to form strong covalent bonds. Therefore, they have excellent color fastness and are currently the most commonly used wool dyes. Cellulose fibers contain active hydroxyl groups, which dissociate into oxygen anions under alkaline conditions and react with groups on the dyes to form covalent bonds under alkaline dye bath conditions to achieve dyeing. Polyamide fibers and wool both have amino groups at the ends of the macromolecular chains, but there are differences in the fiber structure, and the affinity for dyes is different from that of wool. The physical and chemical properties of different fibers in blended fabrics are different, resulting in differences in dyeing properties. If the traditional two-bath method is used, although the dyeing is of good color consistency, the process is relatively lengthy, the operation is cumbersome, and the material and energy consumption is large. Therefore, dyeing multi-component wool blended fabrics with the same color through a one-bath method to overcome the differences in dyeing properties between wool and blended fibers is an urgent problem to be solved in the dyeing process.

[0004] CN104328694A discloses a one-bath dyeing method for shrink-proof wool / Tencel / nylon blended fabrics, using cotton reactive dyes, adding auxiliaries, performing a dyeing process, and then performing a reduction cleaning process to complete the dyeing of the blended fabric. However, in actual processes, it is found that the dyeing effect of general cotton reactive dyes is not good, and directly dyeing the fabric also affects the coloring efficiency.

[0005] CN108396570A discloses a dyeing method for Tencel / wool / nylon fabrics. After the Tencel / wool / nylon fabrics are treated with a pretreatment liquid, direct dyes and acid dyes are used to dye the Tencel under a pH of 9-11, and then glacial acetic acid is used to adjust the pH to 3-5 in an acidic environment to dye wool and nylon. This method uses two steps to dye different fibers separately. On the one hand, the steps are relatively complicated. On the other hand, when dyeing separately, it is inevitable that other fibers will be affected, resulting in poor homochromicity.

[0006] CN112227095A, CN112176741A and the like use acid dyes and auxiliary agents to dye mixed fibers of nylon and wool, but this method is not suitable for cellulose fiber fabrics.

[0007] In view of the problem of homochromaticity that still exists in multi-component wool fabrics, it is necessary to develop a dyeing process that further improves the homochromaticity. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for dyeing multi-component wool fabrics in the same color, and to optimize the one-bath dyeing process based on the difference in dyeing performance of multi-component fabrics to improve the same color of the fabrics.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] The present invention provides a method for dyeing a multi-component wool fabric in the same color, and the method comprises the following steps:

[0011] (1) performing pre-dyeing treatment on the wool blended fabric to obtain a pre-treated fabric;

[0012] (2) dyeing the pretreated fabric using a cotton reactive dye and a dye auxiliary, wherein the cotton reactive dye includes a cotton reactive dye having a heterobifunctional group, to obtain a dyed fabric;

[0013] (3) The dyed fabric is subjected to soap washing treatment to obtain a blended fabric of the same color.

[0014] The dyeing method provided by the present invention firstly performs pre-treatment on the blended fabric, and the pre-treatment plays a role in absorbing oil stains on the surface of the fabric to protect the wool from being damaged. At the same time, the wool fiber is relaxed, and its surface performance is improved, so that the dye can be more easily penetrated and adsorbed into the fiber, thereby improving the dyeing effect. Then, the fabric is dyed with reactive dyes, and reactive dyes with heterobifunctional groups are screened according to the characteristics of reactive dyes. The dyes with such structures have low directness and low initial coloring rate on high-wool-effect fibers. The dye solution contains sufficient dye to dye low-wool-effect fabrics, and the coloring rate difference between different fibers is reduced, thereby avoiding the high-wool-effect fabric from being dyed with excessive dyes at one time, while the low-wool-effect fabric cannot be dyed, and avoiding the situation of twisting. Finally, the unfixed dyes are removed by soaping, and the color fastness is improved. The same color of the blended fabric is improved through the process optimization of the one-bath method.

[0015] Preferably, the wool blended fabric in step (1) comprises wool and regenerated cellulose fibers.

[0016] Preferably, the regenerated cellulose fibers include lyocell fibers.

[0017] Preferably, the pre-dyeing treatment in step (1) uses sodium sulfate, soda ash and a scouring and degreasing agent.

[0018] Preferably, the amount of Glauber's salt used is 3-5wt% of the wool blended fabric, for example, it can be 3wt%, 3.5wt%, 4wt%, 4.5wt% or 5wt%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0019] Preferably, the soda ash is used at a concentration of 0.5-2 g / L, for example, 0.5 g / L, 0.8 g / L, 1 g / L, 1.2 g / L, 1.5 g / L or 1.8 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0020] Preferably, the scouring degreasing agent is used at a concentration of 1-2 g / L, for example, 1 g / L, 1.2 g / L, 1.5 g / L, 1.8 g / L or 2 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0021] Preferably, the temperature of the pre-dyeing treatment in step (1) is 88-92°C, for example, 88°C, 89°C, 90°C, 91°C or 92°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0022] Preferably, the time for the pre-dyeing treatment is 8-12 min, for example, 8 min, 9 min, 10 min, 11 min or 12 min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0023] Preferably, the reactive dye for cotton having heterobifunctional groups in step (2) includes BLUE K-RL.

[0024] Preferably, the reactive dye for cotton further comprises any one of Yellow HB, RED DS or NAVY K-BF or a combination of at least two thereof. Typical but non-limiting combinations include a combination of Yellow HB and RED DS, a combination of RED DS and NAVYK-BF, a combination of Yellow HB and NAVY K-BF, or a combination of Yellow HB, RED DS and NAVY K-BF.

[0025] In the present invention, the BLUE K-RL dye is a spiral matrix structure and has a heterobifunctional group. The dye of this structure has low directness and low initial dyeing rate for high-hair-effect fiber, so that the dye liquor contains sufficient dye to dye low-hair-effect fabric, narrows the difference in dyeing rate between different fibers, and has a good effect on the same color dyeing of wool blended fabrics. At the same time, the hue and shade of the fabric can be well adjusted by adding Yellow HB, RED DS or NAVY K-BF dyes with dual active groups.

[0026] Preferably, the dye auxiliary agent in step (2) includes a chelating dispersant, soda ash and Glauber's salt.

[0027] Preferably, the chelating dispersant comprises Sinquest CA-170.

[0028] Preferably, the chelating dispersant is used at a concentration of 0.5-2 g / L, for example, 0.5 g / L, 0.8 g / L, 1 g / L, 1.2 g / L, 1.5 g / L or 1.8 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0029] Preferably, the soda ash is used at a concentration of 5-15 g / L, for example, 5 g / L, 8 g / L, 10 g / L, 12 g / L or 15 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0030] Preferably, the concentration of the sodium sulfate is 5-60 g / L, for example, it can be 5 g / L, 10 g / L, 15 g / L, 20 g / L, 25 g / L, 30 g / L, 35 g / L, 40 g / L, 45 g / L, 50 g / L, 55 g / L or 60 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0031] Preferably, the dyeing temperature in step (2) is 60-80°C, for example, 60°C, 65°C, 70°C, 75°C or 80°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0032] Preferably, the dyeing time in step (2) is 45-60 min, for example, 45 min, 48 min, 50 min, 52 min, 55 min, 58 min or 60 min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0033] Preferably, the soaping agent in the soaping treatment in step (3) comprises Sinmorle RC-425A.

[0034] Preferably, the pH value of the soap washing treatment in step (3) is 5.5-7, for example, 5.5, 6, 6.5 or 7, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0035] Preferably, the pH is regulated by acetic acid.

[0036] Preferably, the temperature of the soaping treatment in step (3) is 70-80°C, for example, 70°C, 72°C, 75°C, 78°C or 80°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0037] Preferably, the soap washing treatment time in step (3) is 10-20 min, for example, 10 min, 12 min, 15 min, 18 min or 20 min, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0038] As a preferred technical solution of the same color dyeing method provided by the present invention, the same color dyeing method comprises the following steps:

[0039] (1) using 55N / 1 non-cruel shrink-resistant wool / lyocell compact spinning to weave a weft-knitted blended knitted fabric, adding 3-5wt% of sodium sulfate to the blended knitted fabric, adding 1-2g / L of RC9 scouring and degreasing agent and 0.5-2g / L of soda ash to water, and pre-treating the blended knitted fabric by soaking, the pre-treatment temperature is 88-92°C, and the pre-treatment time is 8-12min, to obtain a pre-treated knitted fabric;

[0040] (2) adding a cotton reactive dye having a heterobifunctional group into water, wherein the cotton reactive dye having a heterobifunctional group includes BLUE K-RL, and the cotton reactive dye further includes any one or a combination of at least two of Yellow HB, RED DS or NAVY K-BF, 0.5-2 g / L of a chelating dispersant, 5-15 g / L of soda ash and 5-60 g / L of sodium sulfate, and dyeing the pretreated knitted fabric at a temperature of 60-80° C. and a dyeing time of 45-60 min to obtain a dyed knitted fabric;

[0041] (3) adding 0.5-2 g / L of soaping agent into water, controlling the pH of the liquid to 5.5-7, and soaping the dyed knitted fabric at a temperature of 70-80° C. for 10-20 min, and obtaining a blended fabric of the same color after soaping.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The dyeing method provided by the present invention is based on a one-bath dyeing method, screens reactive dyes with a specific structure, and combines the pre-treatment and post-treatment processes of the fabric, so as to effectively improve the dyeing homochromaticity of the blended fabric containing wool, and the dyeing is uniform. The treated fabric has good dimensional stability and softness, thereby improving the appearance and grade of the fabric product. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0045] Example 1

[0046] This embodiment provides a method for dyeing a multi-component wool fabric in the same color, and the method comprises the following steps:

[0047] (1) Pretreatment: 55N / 1 non-cruel shrink-resistant wool 40 / lyocell 60 was tightly woven into a weft knitted fabric, water was heated to 90°C, the knitted fabric was placed in the water, 4wt% of sodium sulfate was first added to the knitted fabric, and then 1.5g / L of RC9 scouring and degreasing agent and 1g / L of soda ash were added according to the amount of water, and the knitted fabric was pretreated for 10min;

[0048] (2) Dyeing: Heat water to 60°C, add 1 g / L of chelating dispersant Sinquest CA-170, 10 g / L of soda ash, 30 g / L of sodium sulfate and reactive dye BLUE K-RL in order according to the amount of water, and dye the pre-treated knitted fabric at a heat preservation temperature for 60 min;

[0049] (3) Post-treatment: After dyeing, the knitted fabric was soaped with soaping agent Sinmorle RC-425A. The amount of soaping agent used was 1 g / L according to the water volume. The pH of the soaping solution was adjusted to 6, the soaping temperature was 75°C, and the soaping time was 15 min. After the soaping was completed, a knitted fabric of the same color was obtained.

[0050] Example 2

[0051] This embodiment provides a method for dyeing a multi-component wool fabric in the same color, and the method comprises the following steps:

[0052] (1) Pretreatment: 55N / 1 non-cruel shrink-resistant wool 40 / lyocell 60 was tightly woven into a weft knitted fabric, water was heated to 88°C, the knitted fabric was placed in the water, 5wt% of sodium sulfate was first added to the knitted fabric, and then 2g / L of RC9 scouring and degreasing agent and 0.5g / L of soda ash were added according to the amount of water, and the knitted fabric was pretreated for 12min;

[0053] (2) Dyeing: Heat water to 60°C, add chelating dispersant Sinquest CA-1700 0.5 g / L, soda ash 5 g / L, sodium sulfate 60 g / L and reactive dye BLUE K-RL in order according to the amount of water, and dye the pre-treated knitted fabric at a heat preservation temperature for 45 min;

[0054] (3) Post-treatment: After dyeing, the knitted fabric was soaped with soaping agent Sinmorle RC-425A. The amount of soaping agent used was 0.5 g / L according to the water volume. The pH of the soaping solution was adjusted to 7, the soaping temperature was 80°C, and the soaping time was 10 min. After the soaping was completed, a knitted fabric of the same color was obtained.

[0055] Example 3

[0056] This embodiment provides a method for dyeing a multi-component wool fabric in the same color, and the method comprises the following steps:

[0057] (1) Pretreatment: 55N / 1 non-cruel shrink-resistant wool 40 / lyocell 60 was tightly woven into a weft knitted fabric, water was heated to 92°C, the knitted fabric was placed in the water, 3wt% of sodium sulfate was first added to the knitted fabric, and then 1g / L of RC9 scouring and degreasing agent and 2g / L of soda ash were added according to the amount of water, and the knitted fabric was pretreated for 8min;

[0058] (2) Dyeing: Heat water to 60°C, add chelating dispersant Sinquest CA-1702 g / L, soda ash 15 g / L, sodium sulfate 5 g / L and reactive dye BLUE K-RL in order according to the amount of water, and dye the pre-treated knitted fabric at a heat preservation temperature for 60 min;

[0059] (3) Post-treatment: After dyeing, the knitted fabric was soaped with soaping agent Sinmorle RC-425A. The amount of soaping agent used was 2 g / L according to the water volume. The pH of the soaping solution was adjusted to 5.5. The soaping temperature was 70°C and the soaping time was 20 min. After the soaping was completed, a knitted fabric of the same color was obtained.

[0060] Example 4

[0061] This embodiment provides a method for dyeing a multi-component wool fabric in the same color. Compared with Embodiment 1, no soda ash is added in step (2), and the rest is the same as Embodiment 1.

[0062] Example 5

[0063] This embodiment provides a method for dyeing a multi-component wool fabric in the same color. Compared with Embodiment 1, no sodium sulfate is added in step (2), and the rest is the same as Embodiment 1.

[0064] Example 6

[0065] This embodiment provides a method for dyeing a multi-component wool fabric in the same color. Compared with Embodiment 1, the dyeing temperature in step (2) is controlled to be 50° C., and the rest is the same as Embodiment 1.

[0066] Example 7

[0067] This embodiment provides a method for dyeing a multi-component wool fabric in the same color. Compared with Embodiment 1, the dyeing temperature in step (2) is controlled to be 90° C., and the rest is the same as Embodiment 1.

[0068] Example 8

[0069] This embodiment provides a method for dyeing a multi-component wool fabric in the same color. Compared with Example 1, no sodium sulfate is added in step (1), and the rest is the same as Example 1.

[0070] Comparative Example 1

[0071] This comparative example provides a method for dyeing a multi-component wool fabric in the same color. Compared with Example 1, the reactive dye in step (2) is replaced by SYNOZOL BRILLANT BLUE R 150% reactive dye for cotton, and the rest is the same as Example 1.

[0072] Comparative Example 2

[0073] This comparative example provides a method for dyeing a multi-component wool fabric in the same color. Compared with Example 1, the pre-treatment of step (1) is not performed, and the rest is the same as Example 1.

[0074] Comparative Example 3

[0075] This comparative example provides a method for dyeing a multi-component wool fabric in the same color. Compared with Example 1, the post-treatment of step (3) is not performed, and the rest is the same as Example 1.

[0076] The same color knitted fabrics obtained in the examples and comparative examples were tested for performance, and the results are listed in Table 1.

[0077] The AATCC method was used to test the soaping, friction, light fastness, perspiration and water resistance of knitted fabrics.

[0078] Table 1

[0079]

[0080]

[0081] As can be seen from Table 1, the dyeing method provided by the present invention has a good dyeing effect on the blended fabric containing wool and lyocell fiber, and has a good homochromic effect. In addition, different structural dyes and ratios will significantly affect the homochromic effect, and different processes and amounts of auxiliaries will affect each stage of the weight, feel and fastness.

[0082] In Example 1, the coloring of the fabric is good, the same color effect is good, no twisting occurs, the hand feel is soft, and all the properties are good. Compared with Example 1, in Example 2 and Example 3, due to the adjustment of the auxiliary agent ratio and various process parameters, the final dyeing and same color effect are slightly different; in Example 4, without adding soda ash, the coloring is very light, soda ash plays a role of fixing color in the dyeing process, and color fixing cannot be achieved without adding soda ash. If soda ash is too much, the fabric feels hard; in Example 5, without adding sodium sulfate, it is basically impossible to color, sodium sulfate plays a role of promoting dyeing in the dyeing process, and the appropriate amount of sodium sulfate is regulated to achieve the ideal dyeing effect. If sodium sulfate is too much, it is easy to make the dyeing darker; in Example 6 and Example 7, changing the dyeing temperature will affect the depth and hue of the dyeing color; in Example 8, sodium sulfate is used in the pretreatment to absorb oil and protect wool. If sodium sulfate is not used, the subsequent coloring effect will be affected.

[0083] In Comparative Example 1, compared with BLUE K-RL dye, SYNOZOL BRILLANT BLUE R150% does not have a helical structure and a heterobifunctional group, and its coloring and isochromatic effects are not ideal; in Comparative Examples 2 and 3, no pre-treatment or post-treatment is performed, which has a significant impact on the overall dyeing effect, and any treatment step in the dyeing process is indispensable.

[0084] In summary, the dyeing method provided by the present invention is based on the one-bath dyeing method, screens reactive dyes with specific structures, and combines the pre-treatment and post-treatment processes of the fabric to effectively improve the dyeing homochromaticity of the blended fabric containing wool, and the dyeing is uniform. The treated fabric has good dimensional stability and softness, thereby improving the appearance and grade of the fabric product.

[0085] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for dyeing a multi-component wool fabric in the same color, characterized in that: The same color dyeing method comprises the following steps: (1) performing pre-dyeing treatment on the wool blended fabric to obtain a pre-treated fabric; (2) dyeing the pretreated fabric using a cotton reactive dye and a dye auxiliary, wherein the cotton reactive dye includes a cotton reactive dye having a heterobifunctional group, to obtain a dyed fabric; (3) The dyed fabric is subjected to soap washing treatment to obtain a blended fabric of the same color.

2. The same color dyeing method according to claim 1, characterized in that: The wool blended fabric in step (1) comprises wool and regenerated cellulose fiber; Preferably, the regenerated cellulose fibers include lyocell fibers.

3. The same color dyeing method according to claim 1 or 2, characterized in that: The pre-dyeing treatment in step (1) uses sodium sulfate, soda ash and a scouring and degreasing agent; Preferably, the amount of the sodium sulfate is 3-5wt% of the wool blended fabric; Preferably, the soda ash is used at a concentration of 0.5-2 g / L; Preferably, the scouring and degreasing agent is used at a concentration of 1-2 g / L.

4. The same color dyeing method according to any one of claims 1 to 3, characterized in that: The temperature of the pre-dyeing treatment in step (1) is 88-92°C; Preferably, the pre-dyeing treatment lasts for 8-12 minutes.

5. The same color dyeing method according to any one of claims 1 to 4, characterized in that: The reactive dye for cotton having heterobifunctional groups in step (2) includes BLUE K-RL; Preferably, the reactive dye for cotton further comprises any one of Yellow HB, RED DS or NAVY K-BF or a combination of at least two thereof.

6. The same color dyeing method according to any one of claims 1 to 5, characterized in that: The dyeing auxiliary agent in step (2) comprises a chelating dispersant, soda ash and sodium sulfate; Preferably, the chelating dispersant comprises Sinquest CA-170; Preferably, the chelating dispersant is used at a concentration of 0.5-2 g / L; Preferably, the soda ash is used at a concentration of 5-15 g / L; Preferably, the use concentration of the Glauber's salt is 5-60 g / L.

7. The same color dyeing method according to any one of claims 1 to 6, characterized in that: The dyeing temperature in step (2) is 60-80°C; Preferably, the dyeing time in step (2) is 45-60 minutes.

8. The same color dyeing method according to any one of claims 1 to 7, characterized in that: The soaping agent of the soaping treatment in step (3) comprises Sinmorle RC-425A; Preferably, the pH value of the soaping treatment in step (3) is 5.5-7; Preferably, the pH is regulated by acetic acid.

9. The same color dyeing method according to any one of claims 1 to 8, characterized in that: The temperature of the soaping treatment in step (3) is 70-80°C; Preferably, the soaping treatment in step (3) is performed for 10-20 minutes.

10. The same color dyeing method according to any one of claims 1 to 9, characterized in that: The same color dyeing method comprises the following steps: (1) using 55N / 1 non-cruel shrink-resistant wool / lyocell compact spinning to weave a weft-knitted blended knitted fabric, adding 3-5wt% of sodium sulfate to the blended knitted fabric, adding 1-2g / L of RC9 scouring and degreasing agent and 0.5-2g / L of soda ash to water, and pre-treating the blended knitted fabric by soaking, the pre-treatment temperature is 88-92°C, and the pre-treatment time is 8-12min, to obtain a pre-treated knitted fabric; (2) adding a cotton reactive dye having a heterobifunctional group into water, wherein the cotton reactive dye having a heterobifunctional group includes BLUE K-RL, and the cotton reactive dye further includes any one of Yellow HB, RED DS or NAVY K-BF or a combination of at least two thereof, adding 0.5-2 g / L of a chelating dispersant, 5-15 g / L of soda ash and 5-60 g / L of sodium sulfate according to the amount of water, dyeing the pretreated knitted fabric, wherein the dyeing temperature is 60-80° C., and the dyeing time is 45-60 min, to obtain a dyed knitted fabric; (3) adding 0.5-2 g / L of soaping agent into water, controlling the pH of the liquid to 5.5-7, and soaping the dyed knitted fabric at a temperature of 70-80° C. for 10-20 min, and obtaining a blended fabric of the same color after soaping.

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