A method of top dyeing a multi-component wool fabric

Abstract

The application provides a method for homochromatic dyeing of multi-component wool fabric, which comprises the following steps: carrying out dyeing pretreatment on wool blended fabric to obtain pretreated fabric; using cotton active dye and dyeing auxiliary to dye the pretreated fabric, wherein the cotton active dye comprises cotton active dye with heterobifunctional group, to obtain dyed fabric; carrying out soaping treatment on the dyed fabric to obtain homochromatic blended fabric. The dyeing method provided by the application is based on one-bath dyeing method, active dyes with specific structure are screened, and pretreatment and post-treatment processes of the fabric are combined, so that the homochromaticity of the blended fabric containing wool is effectively improved, the dyeing is uniform, the treated fabric has good dimensional stability and softness, and the appearance and grade of the fabric product are improved.

Description

Technical Field

[0001] This invention belongs to the field of textile dyeing and finishing technology, and relates to a dyeing method for fabrics, particularly a method for dyeing multi-component wool fabrics in the same color. Background Technology

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

[0003] Conventional dyeing of wool blended fabrics involves selecting appropriate dyes based on the type of wool and its blended fibers. Wool is a protein fiber composed of amino acids, containing numerous amino, carboxyl, and hydroxyl groups in its molecules. It can be dyed using acid dyes, metal complex dyes, and reactive dyes. Among these, reactive dyes react chemically with the amino groups in protein fibers to form strong covalent bonds, resulting in excellent colorfastness and making them a commonly used wool dye. Cellulose fibers contain reactive hydroxyl groups, which dissociate into oxygen anions under alkaline conditions. These anions then react with the groups on the dye in an alkaline dye bath to form covalent bonds, achieving dyeing. Polyamide fibers, like wool, have amino groups at the ends of their macromolecular chains, but their fiber structures differ, leading to different dye affinities. The different physicochemical properties of the fibers in blended fabrics result in variations in dyeing performance. While the traditional two-bath method offers good color uniformity, it is relatively lengthy, cumbersome, and consumes significant amounts of materials and energy. Therefore, overcoming the differences in dyeing characteristics between wool and blended fibers by performing one-bath dyeing treatment on multi-component wool blended fabrics in the same color is an urgent problem to be solved in dyeing technology.

[0004] CN104328694A discloses a one-bath dyeing method for shrink-resistant wool / Tencel / nylon blended fabrics. The method uses cotton reactive dyes, adds auxiliaries, performs a dyeing process, and then performs a reduction washing process to complete the dyeing of the blended fabric. However, in actual practice, it has been found that the dyeing effect of general cotton reactive dyes is poor, and directly dyeing the fabric also affects the dyeing efficiency.

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

[0006] CN112227095A, CN112176741A, etc., use acid dyes and auxiliaries to dye mixed fibers of nylon and wool, but this method is not suitable for cellulosic fiber fabrics.

[0007] To address the persistent issue of color uniformity in multi-component wool fabrics, a dyeing process that further enhances color uniformity needs to be developed. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a method for color-matching multi-component wool fabrics. This method optimizes the one-bath dyeing process to improve the color-matching properties of multi-component fabrics by addressing the differences in dyeing performance.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] This invention provides a method for dyeing multi-component wool fabrics in the same color, the method comprising the following steps:

[0011] (1) The wool blended fabric is subjected to pre-dyeing treatment to obtain the pre-treated fabric;

[0012] (2) The pretreated fabric is dyed with cotton reactive dyes and dye auxiliaries, wherein the cotton reactive dyes include cotton reactive dyes with heterodifunctional groups, to obtain dyed fabric.

[0013] (3) The dyed fabric is soaped to obtain a blended fabric of the same color.

[0014] The dyeing method provided by this invention first pre-treats the blended fabric. This pre-treatment absorbs oil stains on the fabric surface, protecting the wool from damage. Simultaneously, it relaxes the wool fibers, improving their surface properties and allowing dyes to penetrate and be absorbed more easily into the fibers, thus improving the dyeing effect. Then, reactive dyes are used to dye the fabric. Based on the characteristics of reactive dyes, reactive dyes with heterodifunctional groups are selected. Dyes with this structure have lower directness and a lower initial dyeing rate on high-wicking-efficiency fibers. This ensures that the dye bath contains sufficient dye for dyeing low-wicking-efficiency fabrics, reducing the difference in dyeing rate between different fibers. This avoids excessive dyeing of high-wicking-efficiency fabrics at once, while low-wicking-efficiency fabrics cannot be dyed at all, preventing twisting. Finally, soaping removes unfixed dyes, improving color fastness. Through process optimization using a one-bath method, the color uniformity of the blended fabric is improved.

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

[0016] Preferably, the regenerated cellulose fiber includes lyocell fiber.

[0017] Preferably, the pretreatment for dyeing in step (1) uses Glauber's salt, soda ash, and a scouring and degreasing agent.

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

[0019] Preferably, the concentration of the soda ash used is 0.5-2 g / L, for example, it can be 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. Other unlisted values ​​within the range are also applicable.

[0020] Preferably, the concentration of the refining degreasing agent is 1-2 g / L, for example, it can be 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. Other unlisted values ​​within the range are also applicable.

[0021] Preferably, the temperature of the pre-staining treatment in step (1) is 88-92℃, for example, it can be 88℃, 89℃, 90℃, 91℃ or 92℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0022] Preferably, the pre-staining treatment time is 8-12 minutes, for example, 8 minutes, 9 minutes, 10 minutes, 11 minutes or 12 minutes, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

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

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

[0025] In this invention, the BLUE K-RL dye has a helical parent structure and heterodifunctional groups. This structure results in lower dye directness and a lower initial dyeing rate for high-wicking-effect fibers, ensuring sufficient dye in the dye bath for dyeing low-wicking-effect fabrics. This reduces the difference in dyeing rate between different fibers and provides good color-matching results for wool blends. Furthermore, the hue and color of the fabric can be effectively adjusted by adding dyes with dual reactive groups such as Yellow HB, RED DS, or NAVY K-BF.

[0026] Preferably, the dye auxiliaries in step (2) include chelating dispersants, soda ash, and sodium sulfate.

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

[0028] Preferably, the concentration of the chelating dispersant is 0.5-2 g / L, for example, it can be 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. Other unlisted values ​​within the range are also applicable.

[0029] Preferably, the concentration of the soda ash used is 5-15 g / L, for example, it can be 5 g / L, 8 g / L, 10 g / L, 12 g / L or 15 g / L, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0030] Preferably, the concentration of Glauber's salt used 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. Other unlisted values ​​within the range are also applicable.

[0031] Preferably, the staining temperature in step (2) is 60-80℃, for example, it can be 60℃, 65℃, 70℃, 75℃ or 80℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0032] Preferably, the staining time in step (2) is 45-60 min, for example, it can be 45 min, 48 min, 50 min, 52 min, 55 min, 58 min or 60 min, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

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

[0034] Preferably, the pH value of the soaping treatment in step (3) is 5.5-7, for example, it can be 5.5, 6, 6.5 or 7, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0035] Preferably, the pH is adjusted using acetic acid.

[0036] Preferably, the temperature of the soaping treatment in step (3) is 70-80℃, for example, it can be 70℃, 72℃, 75℃, 78℃ or 80℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0037] Preferably, the soaping treatment time in step (3) is 10-20 min, for example, it can be 10 min, 12 min, 15 min, 18 min or 20 min, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0038] As a preferred embodiment of the same-color dyeing method provided by the present invention, the same-color dyeing method includes the following steps:

[0039] (1) Weaving is carried out using 55N / 1 non-abusive shrink-resistant wool / lyocell compact spinning to obtain weft-knitted blended fabric. 3-5wt% of sodium sulfate is added to the blended fabric, and 1-2g / L of RC9 scouring and degreasing agent and 0.5-2g / L of soda ash are added to water to pre-treat the blended fabric by immersion. The pre-treatment temperature is 88-92℃ and the pre-treatment time is 8-12min to obtain pre-treated knitted fabric.

[0040] (2) Add a cotton reactive dye having a heterodifunctional group to water, wherein the cotton reactive dye having a heterodifunctional group includes BLUE K-RL, and the cotton reactive dye also 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 chelating dispersant, 5-15 g / L of soda ash and 5-60 g / L of sodium sulfate, and dye the pretreated knitted fabric. The dyeing temperature is 60-80℃ and the dyeing time is 45-60 min to obtain the dyed knitted fabric.

[0041] (3) Add 0.5-2 g / L of soaping agent to water, control the pH of the liquid to 5.5-7, and soap wash the dyed knitted fabric. The soap washing temperature is 70-80℃ and the soap washing time is 10-20 min. After the soap washing is completed, a blended fabric of the same color is obtained.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] The dyeing method provided by this invention is based on one-bath dyeing, which selects reactive dyes with specific structures and combines them with pre-treatment and post-treatment processes for the fabric. This effectively improves the color uniformity of blended fabrics containing wool, resulting in uniform dyeing. The treated fabric also has good dimensional stability and softness, enhancing the aesthetics and grade of the fabric products. Detailed Implementation

[0044] The technical solution of the present invention will be further illustrated below through specific embodiments.

[0045] Example 1

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

[0047] (1) Pretreatment: 55N / 1 non-abuse shrink-resistant wool 40 / Lyocell 60 is tightly spun into weft knitted fabric. The water is heated to 90℃ and the knitted fabric is placed in the water. First, 4wt% of sodium sulfate is added to the knitted fabric. Then, 1.5g / L of RC9 scouring and degreasing agent and 1g / L of soda ash are added according to the amount of water. The knitted fabric is pretreated for 10min.

[0048] (2) Dyeing: Heat water to 60°C, and add chelating dispersant Sinquest CA-170 1g / L, soda ash 10g / L, sodium sulfate 30g / L and reactive dye BLUE K-RL in sequence according to the amount of water. Keep the pretreated knitted fabric warm for 60min for dyeing.

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

[0050] Example 2

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

[0052] (1) Pretreatment: 55N / 1 non-abuse shrink-resistant wool 40 / Lyocell 60 is tightly spun into weft knitted fabric. The water is heated to 88℃. The knitted fabric is placed in the water. First, 5wt% sodium sulfate is added to the knitted fabric. Then, 2g / L of RC9 scouring and degreasing agent and 0.5g / L of soda ash are added according to the amount of water. The knitted fabric is pretreated for 12min.

[0053] (2) Dyeing: Heat water to 60°C, add chelating dispersant Sinquest CA-1700.5g / L, soda ash 5g / L, sodium sulfate 60g / L and reactive dye BLUE K-RL in sequence according to the amount of water, and keep the pretreated knitted fabric warm for 45min for dyeing.

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

[0055] Example 3

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

[0057] (1) Pretreatment: 55N / 1 non-abuse shrink-proof wool 40 / Lyocell 60 is tightly spun into weft knitted fabric. The water is heated to 92℃. The knitted fabric is placed in the water. First, 3wt% of sodium sulfate is added to the knitted fabric. Then, 1g / L of RC9 scouring and degreasing agent and 2g / L of soda ash are added according to the amount of water. The knitted fabric is pretreated for 8min.

[0058] (2) Dyeing: Heat water to 60°C, add chelating dispersant Sinquest CA-1702g / L, soda ash 15g / L, sodium sulfate 5g / L and reactive dye BLUE K-RL in sequence according to the amount of water, and keep the pretreated knitted fabric warm for 60min for dyeing.

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

[0060] Example 4

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

[0062] Example 5

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

[0064] Example 6

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

[0066] Example 7

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

[0068] Example 8

[0069] This embodiment provides a method for dyeing 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 in Example 1.

[0070] Comparative Example 1

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

[0072] Comparative Example 2

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

[0074] Comparative Example 3

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

[0076] The same-color knitted fabrics obtained in the examples and comparative examples were subjected to performance tests, and the results are listed in Table 1.

[0077] The AATCC method was used to test the various properties of knitted fabrics, including washing, rubbing, light resistance, perspiration resistance, and water resistance.

[0078] Table 1

[0079]

[0080]

[0081] As shown in Table 1, the dyeing method provided by this invention has a good dyeing effect on blended fabrics containing wool and lyocell fibers, and exhibits good color matching. Furthermore, different dye structures and ratios significantly affect color matching, and different processes and auxiliary agent dosages affect weight, hand feel, and fastness at each stage.

[0082] In Example 1, the fabric exhibited good color absorption and color matching, with no twisting, a soft hand feel, and excellent overall performance. Compared to Example 1, Examples 2 and 3 showed slight differences in final dyeing and color matching due to adjustments in the auxiliary agent ratios and process parameters. In Example 4, without the addition of soda ash, the color was very light. Soda ash plays a role in color fixing during the dyeing process; without it, color fixing is impossible. Excessive soda ash can make the fabric feel stiff. In Example 5, without the addition of sodium sulfate, color absorption was virtually impossible. Soda ash plays a role in promoting dyeing; adjusting the appropriate amount of sodium sulfate is crucial for achieving the desired dyeing effect. Excessive sodium sulfate can lead to a darker color. In Examples 6 and 7, changing the dyeing temperature affected the depth and hue of the dyed color. In Example 8, the use of sodium sulfate in the pretreatment process helped absorb oil stains and protect the wool. Without sodium sulfate, the subsequent dyeing effect would be affected.

[0083] In Comparative Example 1, compared to BLUE K-RL dye, SYNOZOL BRILLANT BLUE R150% does not have a helical structure and heterodifunctional groups, and its coloring and color matching effects are not ideal. In Comparative Examples 2 and 3, the absence of pretreatment or posttreatment 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 this invention is based on one-bath dyeing, selects reactive dyes with specific structures, and combines pre-treatment and post-treatment processes on the fabric to effectively improve the color uniformity of blended fabrics containing wool, achieve uniform dyeing, and the treated fabric has good dimensional stability and softness, thereby enhancing the aesthetics and grade of the fabric products.

[0085] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are 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 within the protection scope of the present invention.

Claims

1. A method for dyeing multi-component wool fabric in the same color, characterized in that, The same-color dyeing method includes the following steps: (1) A pre-dyeing treatment is performed on a wool blended fabric to obtain a pre-treated fabric; the pre-dyeing treatment uses sodium sulfate, soda ash and a scouring and degreasing agent; the wool blended fabric includes wool and regenerated cellulose fibers; (2) The pretreated fabric is dyed with cotton reactive dyes and dye auxiliaries, wherein the cotton reactive dyes include cotton reactive dyes with heterodifunctional groups to obtain dyed fabrics; the dye auxiliaries include chelating dispersants, soda ash and sodium sulfate; the dyeing temperature is 60-80℃; the cotton reactive dyes with heterodifunctional groups include BLUE K-RL; (3) The dyed fabric is soaped to obtain a blended fabric of the same color.

2. The same-color dyeing method according to claim 1, characterized in that, The regenerated cellulose fiber includes lyocell fiber.

3. The same-color dyeing method according to claim 1, characterized in that, The amount of Glauber's salt used in step (1) is 3-5 wt% of the wool blend fabric.

4. The same-color dyeing method according to claim 1, characterized in that, The concentration of soda ash used in step (1) is 0.5-2 g / L.

5. The same-color dyeing method according to claim 1, characterized in that, The concentration of the refining and degreasing agent used in step (1) is 1-2 g / L.

6. The same-color dyeing method according to claim 1, characterized in that, The temperature for the pre-staining treatment in step (1) is 88-92℃.

7. The same-color dyeing method according to claim 1, characterized in that, The time for the pre-staining treatment in step (1) is 8-12 min.

8. The same-color dyeing method according to claim 1, characterized in that, The reactive dyes for cotton in step (2) also include any one or a combination of at least two of Yellow HB, RED DS, or NAVY K-BF.

9. The same-color dyeing method according to claim 1, characterized in that, The chelating dispersant in step (2) includes Sinquest CA-170.

10. The same-color dyeing method according to claim 1, characterized in that, The concentration of the chelating dispersant used in step (2) is 0.5-2 g / L.

11. The same-color dyeing method according to claim 1, characterized in that, The concentration of soda ash used in step (2) is 5-15 g / L.

12. The same-color dyeing method according to claim 1, characterized in that, The concentration of Glauber's salt used in step (2) is 5-60 g / L.

13. The same-color dyeing method according to claim 1, characterized in that, The staining time in step (2) is 45-60 min.

14. The same-color dyeing method according to claim 1, characterized in that, The soaping agent used in step (3) includes Sinmorle RC-425A.

15. The same-color dyeing method according to claim 1, characterized in that, The pH value of the soaping treatment in step (3) is 5.5-7.

16. The same-color dyeing method according to claim 15, characterized in that, The pH is regulated by acetic acid.

17. The same-color dyeing method according to claim 1, characterized in that, The temperature of the soap washing process in step (3) is 70-80℃.

18. The same-color dyeing method according to claim 1, characterized in that, The soap washing process in step (3) takes 10-20 minutes.

19. The same-color dyeing method according to claim 1, characterized in that, The same-color dyeing method includes the following steps: (1) Weaving is carried out using 55N / 1 non-abusive shrink-resistant wool / lyocell compact spinning to obtain weft-knitted blended fabric. 3-5wt% of sodium sulfate is added to the blended fabric, and 1-2g / L of RC9 scouring and degreasing agent and 0.5-2g / L of soda ash are added to water to pre-treat the blended fabric by immersion. The temperature of the pre-treatment is 88-92℃ and the time of the pre-treatment is 8-12min to obtain the pre-treated fabric. (2) Add a cotton reactive dye having a heterodifunctional group to water, wherein the cotton reactive dye having a heterodifunctional group includes BLUE K-RL, and the cotton reactive dye also includes any one or a combination of at least two of Yellow HB, RED DS or NAVY K-BF, and add 0.5-2 g / L of chelating dispersant, 5-15 g / L of soda ash and 5-60 g / L of sodium sulfate according to the amount of water, and dye the pretreated knitted fabric. The dyeing temperature is 60-80℃ and the dyeing time is 45-60 min to obtain the dyed knitted fabric. (3) Add 0.5-2 g / L of soaping agent to water, control the pH of the liquid to 5.5-7, and soap the dyed knitted fabric. The soaping temperature is 70-80℃ and the soaping time is 10-20 min. After the soaping is completed, a blended fabric of the same color is obtained.

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