Cotton and wool blended fabric dyeing method
By combining neutral reactive dyes and electrolytes, the one-bath dyeing process solves the problems of complex and uneven dyeing of cotton and wool blended fabrics, achieving colorfastness and high color fastness in cotton and wool blended fabrics, simplifying the process and reducing the use of organic auxiliaries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-04-03
AI Technical Summary
Cotton and wool blended fabrics have problems with complex dyeing processes and poor dyeing uniformity, especially when using acid dyes to dye wool fibers and reactive dyes to dye cotton fibers, which can easily damage wool fibers and cause large color differences.
A one-bath dyeing process using neutral reactive dyes and electrolytes under specific temperature and time conditions is employed. By adding electrolytes such as sodium chloride, potassium chloride, or sodium sulfate to the dye bath, and combining them with neutral reactive dyes such as neutral reactive blue CN-BL, CN-MG, or CN-3B dyes, the same color dyeing of cotton and wool blended fabrics is achieved.
It achieves one-step dyeing of cotton and wool blended fabrics, with good dyeing uniformity and color fastness. The process is simple, requires no organic auxiliaries, and is green and environmentally friendly.
Smart Images
Figure CN121781445A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of dyeing and finishing technology, specifically to a method for dyeing cotton-wool blended fabrics. Background Technology
[0002] Cotton fiber is mainly composed of cellulose and has good alkali resistance. It is primarily dyed using reactive dyes for cotton. During the dyeing process, an alkali agent is added to promote a chemical reaction between the reactive dye and cellulose, forming covalent bonds, thus giving it good wash fastness. Wool fiber is mainly composed of protein and has good acid resistance. It is primarily dyed using acid dyes. During the dyeing process, hydrogen ions combine with amino groups in wool to form cationic bonds, which can combine with anionic acid dyes, improving the dye uptake and fixation rate of the acid dyes.
[0003] Cotton and wool blends combine the advantages of both, resulting in fabrics that are comfortable, warm, and soft. However, wool is acid-resistant but not alkali-resistant, while cotton is alkali-resistant but not strong acid-resistant. In dyeing cotton and wool blends, if acid dyes are used to dye wool fibers under acidic conditions and reactive dyes to dye cotton fibers under alkaline conditions, the wool fibers will be damaged. Therefore, dyeing cotton and wool blends presents difficulties. To avoid damage to wool fibers under alkaline conditions during dyeing, existing dyeing processes involve first dyeing wool fibers with acidic dyes and then dyeing cotton fibers with direct dyes under neutral conditions, a two-step process requiring two different types of dyes. However, textiles dyed with direct dyes have poor colorfastness and require subsequent color-fixing treatment. Some manufacturers use neutral reactive dyes and wool reactive dyes to dye cotton and wool blended fabrics in one bath. However, because wool fibers have a stronger dye absorption capacity than cotton fibers, the color uniformity of cotton and wool blended fabrics is poor. That is, the color difference between wool and cotton fibers after dyeing is relatively large, resulting in poor fabric evenness. Summary of the Invention
[0004] The purpose of this invention is to overcome the problems of complex dyeing processes and poor dyeing uniformity in existing cotton-wool blended fabrics, and to provide a method for dyeing cotton-wool blended fabrics. This method can achieve color uniformity dyeing of cotton-wool blended fabrics in one step, with good dyeing uniformity and color fastness. Moreover, the dyeing process is simple and does not require the addition of organic auxiliaries, making the process green and environmentally friendly.
[0005] To achieve the above objectives, the present invention provides a method for dyeing cotton-wool blended fabrics, the method comprising the following steps: (1) Mix electrolyte, neutral reactive dye and water to prepare dye solution; (2) Immerse the cotton-wool blended fabric in the dyeing solution for dyeing, take out the dyed cotton-wool blended fabric, and then perform soap washing and drying treatment. In step (1), the concentration of electrolyte in the dye solution is 110-130 g / L; In step (2), the staining conditions include: a temperature of 95-105°C. o C, the time is 50-70 minutes.
[0006] Preferably, in step (1), the electrolyte is selected from one or more of sodium chloride, potassium chloride and sodium sulfate.
[0007] Preferably, in step (1), the amount of neutral reactive dye used in the dyeing solution is 1-5% omf.
[0008] Preferably, in step (1), the neutral reactive dye is selected from one or more of neutral reactive blue CN-BL dye, neutral reactive blue CN-MG dye and neutral reactive red CN-3B dye.
[0009] Preferably, in step (2), the cotton content in the cotton-wool blended fabric is 10-90 wt%.
[0010] Preferably, in step (2), the dyeing bath ratio is 1:15-30.
[0011] Preferably, in step (2), the dyeing process specifically includes: immersing the cotton-wool blended fabric in the dye solution, and then... o Increase the temperature to the target temperature at a rate of C / min, maintain the staining temperature for 50-70 min, and then increase the temperature by 1-3... o The rate of C / min decreased to 30-50 o C.
[0012] Preferably, in step (2), the soaping agent is selected from one or more of soaping agents Luton500, HQSOR40 and HQEPV2140.
[0013] Preferably, the conditions for soap washing include: a temperature of 80-100 degrees Celsius. o C, time is 10-30 minutes, bath ratio is 1:40-60.
[0014] Preferably, the drying conditions include a temperature of 40-80°C. o C, the time is 10-40 minutes.
[0015] Compared with the prior art, the technical solution of the present invention has the following advantages: The cotton-wool blended fabric dyeing method described in this invention can complete the dyeing of cotton-wool blended fabrics in one bath and one step, with good dyeing uniformity and color fastness. Moreover, the dyeing process is simple and does not require the addition of other organic auxiliaries, and the whole process is green and environmentally friendly. Attached Figure Description
[0016] Figure 1 This is a dyed sample image of a cotton-wool blended fabric from Embodiment 1 of the present invention; Figure 2 This is a dyed sample of the cotton-wool blended fabric in Comparative Example 1 of this invention. Detailed Implementation
[0017] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.
[0018] The endpoints and any values of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of the various ranges, the endpoint values of the various ranges and individual point values, and individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.
[0019] This invention provides a method for dyeing cotton-wool blended fabrics, the method comprising the following steps: (1) Mix electrolyte, neutral reactive dye and water to prepare dye solution; (2) Immerse the cotton-wool blended fabric in the dyeing solution for dyeing, take out the dyed cotton-wool blended fabric, and then perform soap washing and drying treatment. In step (1), the concentration of electrolyte in the dye solution is 110-130 g / L; In step (2), the staining conditions include: a temperature of 95-105°C. o C, the time is 50-70 minutes.
[0020] In the method described in this invention, by adding electrolytes to the dye bath and dyeing under specific temperature and time conditions using a one-bath one-step method, the effect of color uniformity in light and dark shades of cotton-wool blended fabrics with different mass ratios can be achieved. The entire process does not require the addition of other organic auxiliaries, the process is simple, green and environmentally friendly, and the dyed cotton-wool blended fabrics have good dyeing uniformity and color fastness.
[0021] In a preferred embodiment, in order to further improve the dyeing uniformity of cotton-wool blended fabrics, in step (1), the electrolyte is selected from one or more of sodium chloride, potassium chloride and sodium sulfate.
[0022] In the method described in this invention, there are no special requirements for the amount of neutral reactive dye used, which can be determined according to the color required for cotton and wool blended fabrics; in a preferred embodiment, in step (1), the amount of neutral reactive dye used in the dye solution is 1-5% omf; specifically, it can be 1% omf, 1.5% omf, 2% omf, 2.5% omf, 3% omf, 3.5% omf, 4% omf, 4.5% omf or 5% omf.
[0023] In a preferred embodiment, in step (1), the neutral reactive dye is selected from one or more of neutral reactive blue CN-BL dye, neutral reactive blue CN-MG dye, and neutral reactive red CN-3B dye.
[0024] In the method described in this invention, there are no special requirements for the content of cotton and wool in the cotton-wool blended fabric; in the preferred embodiment, in step (2), the content of cotton in the cotton-wool blended fabric is 10-90wt%.
[0025] In a preferred embodiment, in order to further improve the dyeing uniformity of cotton-wool blended fabrics, in step (2), the dyeing liquor ratio is 1:15-30; specifically, the dyeing liquor ratio can be 1:15, 1:18, 1:20, 1:22, 1:25, 1:28 or 1:30.
[0026] In a preferred embodiment, to further improve the dyeing uniformity of cotton-wool blended fabrics, step (2) specifically includes: immersing the cotton-wool blended fabric in the dye solution, followed by 1-3... o Increase the temperature to the target temperature at a rate of C / min, maintain the staining temperature for 50-70 min, and then increase the temperature by 1-3... o The rate of C / min decreased to 30-50 o C; Based on this, the dye can be evenly adsorbed, diffused and fixed on the fiber, and the dyed cotton and wool blended fabrics are less likely to produce defects such as color spots and horizontal stripes due to uneven dyeing.
[0027] In a preferred embodiment, in order to improve the color fastness and dyeing uniformity of the cotton-wool blended fabric, in step (2), the soaping agent is selected from one or more of soaping agents Luton500, HQSOR40 and HQEPV2140.
[0028] In a preferred embodiment, the conditions for soap washing include: a temperature of 80-100 degrees Celsius. oC, time is 10-30 minutes, bath ratio is 1:40-60.
[0029] In a preferred embodiment, to further improve the color fastness of the cotton-wool blended fabric, the drying conditions include: a temperature of 40-80°C. o C, the time is 10-40 minutes.
[0030] The following examples further illustrate the method for dyeing cotton-wool blended fabrics according to the present invention. These examples are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following examples.
[0031] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods in the art. Unless otherwise specified, the experimental materials used in the following embodiments are commercially available.
[0032] Example 1 (1) Dissolve 6g of sodium chloride and 0.06g (3% omf) neutral reactive blue CN-BL dye in 50mL of water to prepare a dye solution with a sodium chloride concentration of 120g / L; (2) Immerse 2g of cotton-wool blended fabric (cotton and wool content are both 50wt%) in the dye solution, then add 2 o Heating to 100 °C / min o C, incubate for 60 minutes, then stain with 2 o Cooling rate reduced to 40 °C / min o C. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with Luton 500 soap (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0033] Example 2 (1) Dissolve 6g of sodium chloride and 0.06g (3% omf) neutral reactive blue CN-MG dye in 50mL of water to prepare a dye solution with a sodium chloride concentration of 120g / L; (2) Immerse 2g of cotton-wool blended fabric (cotton content 80wt%, wool content 20wt%) in the dye bath, then add 2g of... o Heating to 100 °C / min o C, incubate for 60 minutes, then stain with 2 o Cooling rate reduced to 40 °C / min oC. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with Luton 500 soap (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0034] Example 3 (1) Dissolve 6g of sodium sulfate and 0.06g (3% omf) neutral reactive blue CN-BL dye in 50mL of water to prepare a dye solution with a sodium sulfate concentration of 120g / L; (2) Immerse 2g of cotton-wool blended fabric (cotton and wool content are both 50wt%) in the dye solution, then add 2 o Heating to 100 °C / min o C, incubate for 60 minutes, then stain with 2 o Cooling rate reduced to 40 °C / min o C. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with soap detergent HQSOR40 (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0035] Example 4 The procedure was carried out in accordance with Example 1, except that in step (2), the dyeing bath ratio was 1:10, i.e.: (1) Dissolve 6g of sodium chloride and 0.15g (3% omf) neutral reactive blue CN-BL dye in 50mL of water to prepare a dye solution with a sodium chloride concentration of 120g / L; (2) Immerse 5g of cotton-wool blended fabric (cotton and wool content are both 50wt%) in the dye bath, then add 2 o Heating to 100 °C / min o C, incubate for 60 minutes, then stain with 2 o Cooling rate reduced to 40 °C / min o C. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with Luton 500 soap (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0036] Example 5 The procedure was carried out in accordance with Example 1, except that in step (1), the amount of neutral reactive blue CN-BL dye used was 7% omf, that is: (1) Dissolve 6g of sodium chloride and 0.14g (7% omf) neutral reactive blue CN-BL dye in 50mL of water to prepare a dye solution with a sodium chloride concentration of 120g / L; (2) Immerse 2g of cotton-wool blended fabric (cotton and wool content are both 50wt%) in the dye solution, then add 2 o Heating to 100 °C / min o C, incubate for 60 minutes, then stain with 2 o Cooling rate reduced to 40 °C / min o C. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with Luton 500 soap (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0037] Example 6 The implementation was carried out in accordance with Example 1, except that in step (2), the heating and cooling rates were both 4. o C / min, that is: (1) Dissolve 6g of sodium chloride and 0.06g (3% omf) neutral reactive blue CN-BL dye in 50mL of water to prepare a dye solution with a sodium chloride concentration of 120g / L; (2) Immerse 2g of cotton-wool blended fabric (cotton and wool content are both 50wt%) in the dye bath, then use 4 o Heating to 100 °C / min o C, incubate for staining for 60 minutes, then at 4 o Cooling rate reduced to 40 °C / min o C. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with Luton 500 soap (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0038] Comparative Example 1 The procedure was carried out in accordance with Example 1, except that sodium chloride was not added in step (1), i.e.: (1) Dissolve 0.06g (3% omf) neutral reactive blue CN-BL dye in 50mL of water to prepare the dye solution; (2) Immerse 2g of cotton-wool blended fabric (cotton and wool content are both 50wt%) in the dye solution, then add 2 o Heating to 100 °C / min o C, incubate for 60 minutes, then stain with 2 o Cooling rate reduced to 40 °C / min o C. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with Luton 500 soap (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0039] Comparative Example 2 The procedure was carried out in accordance with Example 1, except that the amount of sodium chloride added in step (1) was 5g, i.e.: (1) Dissolve 5g of sodium chloride and 0.06g (3% omf) neutral reactive blue CN-BL dye in 50mL of water to prepare a dye solution with a sodium chloride concentration of 100g / L; (2) Immerse 2g of cotton-wool blended fabric (cotton and wool content are both 50wt%) in the dye solution, then add 2 o Heating to 100 °C / min o C, incubate for 60 minutes, then stain with 2 o Cooling rate reduced to 40 °C / min o C. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with Luton 500 soap (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0040] Comparative Example 3 The procedure was carried out in accordance with Example 1, except that the amount of sodium chloride added in step (1) was 7g, i.e.: (1) Dissolve 7g of sodium chloride and 0.06g (3% omf) neutral reactive blue CN-BL dye in 50mL of water to prepare a dye solution with a sodium chloride concentration of 140g / L; (2) Immerse 2g of cotton-wool blended fabric (cotton and wool content are both 50wt%) in the dye solution, then add 2 o Heating to 100 °C / mino C, incubate for 60 minutes, then stain with 2 o Cooling rate reduced to 40 °C / min o C. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with Luton 500 soap (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0041] Comparative Example 4 The procedure was carried out as described in Example 1, except that in step (2), the staining conditions were as follows: the temperature was 80°C. o C, the time is 30 minutes, that is: (1) Dissolve 6g of sodium chloride and 0.06g (3% omf) neutral reactive blue CN-BL dye in 50mL of water to prepare a dye solution with a sodium chloride concentration of 120g / L; (2) Immerse 2g of cotton-wool blended fabric (cotton and wool content are both 50wt%) in the dye solution, then add 2 o Heating rate increased to 80 °C / min o C, incubate for 30 minutes, then stain with 2 o Cooling rate reduced to 40 °C / min o C. Remove the dyed cotton-wool blended fabric, spin-dry it in a dehydrator, and then wash it with Luton 500 soap (2g / L) at 95°C. o Wash at C temperature for 15 minutes to remove excess color with soaping. The soaping ratio is 1:50. After soaping, remove and then wash at 60°C. o Dry in an oven at temperature C for 30 minutes.
[0042] Test case (1) The stained samples of Example 1 and Comparative Example 1 were photographed and stored. The results are as follows: Figure 1 and Figure 2 As shown, where, Figure 1 This is a dyed sample image of a cotton-wool blended fabric from Embodiment 1 of the present invention; Figure 2 This is a dyed sample of the cotton-wool blended fabric in Comparative Example 1 of this invention; Depend on Figure 1 It can be seen that: by using the method described in this invention to dye cotton and wool blended fabrics, cotton and wool blended fabrics with good dyeing uniformity can be obtained. Depend on Figure 2 It can be seen that when no electrolyte is added during the dyeing process, the dyeing uniformity of the dyed cotton-wool blended fabric is poor, and the dyeing effect of the dyed cotton-wool blended fabric with obvious differences in shade can be observed. (2) The color fastness and dyeing uniformity of the cotton-wool blended fabrics dyed in the examples and comparative examples were tested, and the color difference of the dyed blended fabrics was detected by a colorimeter. E), 11 points are randomly detected on the dyed fabric surface. Taking the first detection point on the fabric surface as the standard point, the color difference between the next 10 points (points 2-11) and the first point is obtained. E), characterizing the dyeing uniformity of two fibers in dyed blended fabrics, is used in the industry. An E value less than 1 indicates good staining uniformity. The results of the differences in monitoring points in the examples and comparative examples are shown in Table 1. Staining uniformity (mean...) E) The results of color fastness to washing and color fastness to rubbing (wet rubbing and dry rubbing) are shown in Table 2; Table 1
[0043] Table 2
[0044] As can be seen from the results in Tables 1 and 2, the method described in this invention can be used to dye cotton and wool blended fabrics in one step and one bath. The dyed fabrics can obtain good dyeing uniformity and color fastness, and the whole process is simple, green and environmentally friendly.
[0045] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.
Claims
1. A method for dyeing cotton-wool blended fabrics, characterized in that, The method includes the following steps: (1) Mix electrolyte, neutral reactive dye and water to prepare dye solution; (2) Immerse the cotton-wool blended fabric in the dyeing solution for dyeing, take out the dyed cotton-wool blended fabric, and then perform soap washing and drying treatment. In step (1), the concentration of electrolyte in the dye solution is 110-130 g / L; In step (2), the staining conditions include: a temperature of 95-105°C. o C, the time is 50-70 minutes.
2. The method according to claim 1, characterized in that, In step (1), the electrolyte is selected from one or more of sodium chloride, potassium chloride and sodium sulfate.
3. The method according to claim 1 or 2, characterized in that, In step (1), the amount of neutral reactive dye used in the dyeing solution is 1-5% omf.
4. The method according to claim 3, characterized in that, In step (1), the neutral reactive dye is selected from one or more of neutral reactive blue CN-BL dye, neutral reactive blue CN-MG dye and neutral reactive red CN-3B dye.
5. The method according to any one of claims 1-4, characterized in that, In step (2), the cotton content in the cotton-wool blended fabric is 10-90 wt%.
6. The method according to any one of claims 1-5, characterized in that, In step (2), the bath ratio for staining is 1:15-30.
7. The method according to any one of claims 1-6, characterized in that, In step (2), the dyeing process specifically includes: immersing the cotton-wool blended fabric in the dye solution, and then... o Increase the temperature to the target temperature at a rate of C / min, maintain the staining temperature for 50-70 min, and then increase the temperature by 1-3... o The rate of C / min decreased to 30-50 o C.
8. The method according to any one of claims 1-7, characterized in that, In step (2), the soaping agent is selected from one or more of the soaping agents Luton500, HQSOR40 and HQEPV2140.
9. The method according to claim 8, characterized in that, The conditions for soap washing include: a temperature of 80-100 degrees Celsius. o C, time is 10-30 minutes, bath ratio is 1:40-60.
10. The method according to any one of claims 1-9, characterized in that, The drying conditions include: a temperature of 40-80°C. o C, the time is 10-40 minutes.