A biological blue dye, a dyeing solution, and a preparation method and application thereof

Abstract

The application relates to the dyeing and finishing technical field, and particularly discloses a biological blue dye, a dyeing liquid and a preparation method and application thereof. The application mixes and matches pyridone dyes in the observation blue dye, adjusts the observation blue light, offsets the light to cyan, and weakens the red light effect, so that the problem of red light color after the observation blue dyeing and insufficient dyeing depth can be effectively solved, higher color depth can be obtained under the same dyeing concentration and number of passes with the increase of the mixing and matching proportion of the pyridone dyes, and the dry and wet rubbing fastness of the dyed fabric is improved by 0.5 levels.

Description

Technical Field

[0001] This application relates to the field of dyeing and finishing technology, and in particular to a biological blue dye, a dyeing solution, a method for preparing the dye, and its application. Background Technology

[0002] Indigo dye, a novel type of blue bio-dyed, is a natural amino acid-based reducing dye. It is prepared using amino acids as the main raw material through advanced bio-fermentation technology. The production process achieves zero aniline and zero formaldehyde emissions, effectively solving the environmental pollution and safety hazards associated with traditional dye production.

[0003] Compared to traditional chemical dyes, indigo dye excels in several aspects. First, it exhibits superior color saturation, delivering vibrant and long-lasting colors to fabrics. Second, indigo dye boasts excellent colorfastness, maintaining its bright hue even after multiple washes. Most importantly, indigo dye is far ahead in terms of eco-friendliness, fully meeting the green and environmentally friendly requirements of modern industry.

[0004] Indigo can be converted into soluble leucocyanide under the action of a reducing agent, exhibiting good affinity for cellulosic fibers. Fabrics dyed with indigo exhibit a vibrant blue color, but currently suffer from a reddish tint and insufficient dyeing depth, limiting its application in high-end textiles. Using traditional chemical colorants (such as fluorescent whitening agents) reduces dyeing depth and colorfastness; currently, there is no effective solution to significantly improve the blue tint of indigo. Summary of the Invention

[0005] The purpose of this application is to overcome the problem that the color of indigo-dyed fabrics is reddish and to provide a biological blue dye, dyeing solution, preparation method and application thereof.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] This application provides a biological blue dye, which includes a blue dye, a pyridone dye, a reducing agent, and an alkali agent;

[0008] The indigo dye is present in a mass fraction of 3 to 10 parts.

[0009] The mass of the pyridone dye is 0.1% to 55% of the mass of blue indigo.

[0010] Pyridone dye (5-hydroxy-3-iminopyridine-2,6-dione, derived from patent publication number: CN119899881B) is a novel yellow dye. Compared to traditional yellow dyes, it is prepared by microbial fermentation and does not contain toxic or harmful substances such as heavy metals.

[0011] In the technical solution of this application, pyridone dye (5-hydroxy-3-iminopyridine-2,6-dione) is mixed into indigo dye to shift it towards cyan, which can effectively solve the problems of reddish color and insufficient dyeing depth after dyeing indigo. Moreover, a higher color depth can be obtained under the same dyeing concentration and number of passes, and the dry and wet rubbing fastness of the dyed fabric is improved by 0.5 grades.

[0012] Among them, blending 0.1% to 55% of pyridone dye by weight into blue dye can reduce the red light of blue. When the amount of pyridone dye blended is <0.1%, the red light elimination effect is not obvious. When the amount of pyridone dye blended is >55%, the dyed fabric tends to be greenish overall.

[0013] In some specific embodiments, the reducing agent includes at least one of sodium dithionite, thiourea dioxide, sodium sulfide, ascorbic acid, glucose, and sodium sulfite; preferably, the reducing agent is sodium dithionite.

[0014] In some specific embodiments, the alkaline agent includes at least one of sodium hydroxide (caustic soda), potassium hydroxide, sodium carbonate, sodium bicarbonate, and ammonia water, preferably sodium hydroxide.

[0015] In a preferred embodiment of the bio-blue dye described in this application, the mass of the reducing agent is 1.0 to 2.0 times the total mass of the blue dye and the pyridone dye.

[0016] In the technical solution of this application, the reducing agent is added in the above-mentioned amount, which can ensure that the blue is fully reduced.

[0017] In a preferred embodiment of the bio-blue dye described in this application, the mass of the alkali agent is 0.1 to 0.5 times the total mass of the blue dye and the pyridone dye.

[0018] The above-mentioned addition amount ensures that the pH of the pyridone dye solution is maintained at 8.0-9.0, thus guaranteeing the structural stability of blue dye and pyridone.

[0019] This application provides a staining solution containing the aforementioned biological blue dye.

[0020] This application also provides a method for preparing the above-mentioned staining solution, including the following steps:

[0021] S1. Weigh out the indigo dye and pyridone dye in a quantitative amount and mix them evenly.

[0022] S2. Prepare a pigment suspension of 3-10 g / L for the blue dye, add 1.0-2.0 times the total mass of the blue dye and pyridone dye as reducing agent, and mix and stir evenly with 0.1-0.5 times the total mass of the blue dye and pyridone dye as alkali agent to reduce the dyeing solution.

[0023] In a preferred embodiment of the method for preparing the dyeing solution described in this application, in step S1, 3 to 10 parts by weight of indigo dye are added to water to prepare a pigment suspension of 3 to 10 g / L.

[0024] In a preferred embodiment of the method for preparing the staining solution described in this application, in step S2, the temperature of the reducing agent is 25-80°C, and the reducing time is 10-90 min.

[0025] Preferably, the temperature of the reducing agent is 25–60°C, and the reducing time is 10–30 min.

[0026] The reducing agent used in this application under the above conditions can ensure that the pyridone dye is completely reduced.

[0027] This application also provides the application of the above-mentioned dyeing solution in fabric dyeing, wherein the fabric is immersed in the dyeing solution for dyeing, oxidized in air, and dyed repeatedly to obtain dyed fiber fabric.

[0028] Prepare a soap solution with a liquor ratio of (100-300):1, rinse the dyed fiber fabric in the soap solution, and obtain the dyed fiber fabric.

[0029] This application uses a soap solution to fabric bath ratio of (100-300):1 to ensure thorough washing of dyed fabrics and removal of surface impurities and loose dye.

[0030] In a preferred embodiment of the application described in this application, the staining temperature is 20–60°C and the staining time is 0.1–10 min;

[0031] And / or, the air oxidation time is 1 to 10 minutes;

[0032] And / or, the rinsing temperature is 25-60°C, preferably 30-60°C, and the rinsing time is 5-30 minutes.

[0033] The washing effect of the soap solution increases with increasing temperature. However, rinsing temperatures exceeding 60°C may damage the pyridone pigment. If the rinsing time is less than 5 minutes, impurities and loose dye on the fabric surface will not be adequately removed. If the rinsing time is more than 30 minutes, the washing effect of the soap solution will no longer change.

[0034] In a preferred embodiment of the application described in this application, the number of repeat staining lanes is 1 to 10.

[0035] According to this application, the color depth varies depending on the number of staining lanes, and the staining depth gradually increases with the increase of the number of lanes.

[0036] In a preferred embodiment of the application described in this application, the mass concentration of the soap solution is 1 to 10 g / L.

[0037] In the technical solution of this application, if the mass concentration of the soap solution is less than 1g / L, the removal of impurities and floating dye on the fabric surface is insufficient; if the mass concentration of the soap solution is greater than 10g / L, the washing effect of the soap solution no longer changes, resulting in the waste of soap flakes.

[0038] In some specific embodiments, the fabric includes at least one selected from cotton, linen, silk, wool, leather, Tencel, polyester, and nylon. More preferably, the fabric is at least one selected from cotton, linen, silk, wool, Tencel, polyester, and nylon.

[0039] Compared with the prior art, this application has the following beneficial effects:

[0040] This application provides a biological blue dye, its preparation method, and its application. By mixing pyridone (5-hydroxy-3-iminopyridin-2,6-dione) dye into the blue dye, the blue light is adjusted to shift towards cyan light, thus reducing the red light effect. This effectively solves the problems of reddish color and insufficient dyeing depth after blue dyeing. Furthermore, with the increase of the mixing ratio of pyridone dye, a higher color depth can be obtained at the same dyeing concentration and number of passes. The dry and wet rubbing fastness of the dyed fabric is improved by 0.5 grades. Attached Figure Description

[0041] Figure 1 These are dyeing effect diagrams of fabrics from Examples 2 and 4-9;

[0042] Figure 2 The images show the dyeing effects of fabrics in Examples 2, 18-23. Detailed Implementation

[0043] To better illustrate the purpose, technical solution, and advantages of this application, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0044] In the following examples and comparative examples, unless otherwise specified, the experimental methods used are conventional methods, and the materials and reagents used are commercially available unless otherwise specified. Furthermore, the raw materials used in each parallel experiment are the same.

[0045] The pyridone dye (5-hydroxy-3-iminopyridine-2,6-dione) is derived from the patent with authorization publication number CN119899881B.

[0046] The structural formula of pyridone dyes is shown below:

[0047]

[0048] Example 1

[0049] (1) Mixing of powdered pigments: Weigh out 3 parts of the mass of blue powdered dye and 0.1% of the mass of blue powdered dye and pyridone powdered dye, and mix them evenly using a powder mixer.

[0050] (2) Preparation of dyeing solution and dyeing: Prepare a 3 g / L pigment suspension by adding water according to the weight of indigo dye. Add sodium hydrosulfite (equal to the total weight of indigo and pyridone powder dyes) and caustic soda (equal to the total weight of indigo and pyridone powder dyes). Mix and stir evenly, and reduce the dye at 25°C for 90 min to obtain a reduction dyeing solution. Immerse the cotton fabric in the reduction dyeing solution at 20°C for 10 min, oxidize in air for 1 min, and repeat the dyeing process once.

[0051] (3) Washing the fabric: According to the soap solution: fabric ratio of 100:1, the dyed fiber fabric in step (2) is placed in soap solution at 25℃ and 1g / L for 30 minutes and then dried to obtain the dyed fiber fabric.

[0052] Example 2

[0053] (1) Mixing of powdered pigments: Weigh 10 parts of the weight of blue powdered dye and 15% of the weight of pyridone powdered dye, and mix them evenly using a powder mixer.

[0054] (2) Preparation of dyeing solution and dyeing: Prepare a 10 g / L pigment suspension by adding water according to the weight of indigo dye. Add sodium hydrosulfite at 1.5 times the total weight of indigo powder and pyridone powder, and add caustic soda at 0.4 times the total weight of indigo powder and pyridone powder. Mix and stir evenly, and reduce at 30°C for 30 min to obtain a reduction dyeing solution. Immerse cotton fabric in the reduction dyeing solution at 30°C for 0.2 min, oxidize in air for 2 min, and repeat the dyeing process once.

[0055] (3) Washing the fabric: According to the soap solution: fabric ratio of 200:1, the dyed fiber fabric in step (2) is placed in soap solution at 50℃ and 5g / L for 10min, and then dried to obtain the dyed fiber fabric.

[0056] Example 3

[0057] (1) Mixing of powdered pigments: Weigh 5 parts of the mass of blue powdered dye and 55% of the mass of pyridone powdered dye, and mix them evenly using a powder mixer.

[0058] (2) Preparation of dyeing solution and dyeing: Prepare a 5 g / L pigment suspension by adding water according to the weight of indigo powder. Add sodium hydrosulfite at twice the total weight of indigo powder and pyridone powder, and caustic soda at 0.5 times the total weight of indigo powder and pyridone powder. Mix and stir evenly, and reduce at 80°C for 10 min to obtain a reduction dyeing solution. Immerse cotton fabric in the reduction dyeing solution at 60°C for 0.1 min, oxidize in air for 10 min, and repeat the dyeing process once.

[0059] (3) Washing the fabric: According to the soap solution: fabric ratio of 300:1, the dyed fiber fabric in step (2) is placed in 60℃, 10g / L soap solution for 5 minutes and then dried to obtain the dyed fiber fabric.

[0060] Examples 4-9

[0061] Compared with Example 2, the difference between Examples 4 to 9 is that the amount of pyridone powdered dye added is different. The amount of pyridone powdered dye added is 0.3, 5, 10, 20, 30 and 50% of the mass of the blue powdered dye, respectively. The other parameters are the same as those in Example 2.

[0062] Examples 10-13

[0063] Compared with Example 2, the difference between Examples 10 to 13 is that the reducing agents are different. The reducing agents are thiourea dioxide, sodium sulfide, glucose, and ascorbic acid, respectively. The other parameters are the same as those in Example 2.

[0064] Examples 14-17

[0065] Compared with Example 2, the difference between Examples 14 to 17 lies in the addition of alkali and its content. The alkali added is 2.0 times the total mass of blue and pyridone powder dye in soda ash, or 0.4 times the total mass of blue and pyridone powder dye in potassium hydroxide, or 3.0 times the total mass of blue and pyridone powder dye in sodium bicarbonate, or 1.5 times the total mass of blue and pyridone powder dye in ammonia water. The other parameters are the same as in Example 2.

[0066] Examples 18-23

[0067] Compared with Example 2, the difference between Examples 18 to 23 is that the types of fabric fibers used for dyeing are different. The types of fabric fibers used for dyeing are flax, silk, wool, Tencel, polyester, and nylon, respectively. The other parameters are the same as those in Example 2.

[0068] Examples 24-27

[0069] Compared with Example 2, the difference between Examples 24 to 27 is that the number of staining lanes is different, with 1, 4, 7 and 10 staining lanes respectively, while the other parameters are the same as those in Example 2.

[0070] Comparative Example 1

[0071] (1) Preparation of dye solution: Weigh out the powdered blue dye in a quantitative amount and prepare it into a 10g / L blue dye solution. Add 1.5 times the mass of blue dye sodium hydrosulfite and 0.4 times the mass of total pigment caustic soda. Mix and stir evenly, reduce the dye at 30℃ for 30min to obtain the reduction dye solution.

[0072] (2) Dyeing of fabrics: Soak cotton fabrics in a 30°C reducing dyeing solution for 0.2 min, oxidize in air for 2 min, and dye once.

[0073] (3) Washing the fabric: According to the soap solution: fabric ratio of 200:1, the dyed fiber fabric in step (2) is placed in soap solution at 50℃ and 5g / L for 10min, and then dried to obtain the dyed fiber fabric.

[0074] Comparative Example 2

[0075] Compared with Example 2, step (1) of Comparative Example 2 is different. Ten parts of the mass of blue powder dye and 0.05% of the mass of blue powder dye pyridone powder dye are weighed and mixed evenly using a powder mixer. The remaining parameters are the same as those in Example 2.

[0076] Comparative Example 3

[0077] Compared with Example 2, step (1) of Comparative Example 3 is different. Ten parts of the mass of blue powder dye and 60% of the mass of pyridone powder dye were weighed and mixed evenly using a powder mixer. The remaining parameters are the same as those in Example 2.

[0078] Comparative Example 4

[0079] Compared with Example 2, step (2) of Comparative Example 4 is different. 0.5 times the total mass of blue powder dye and pyridone powder dye is added as sodium hydrosulfite, while the other parameters are the same as in Example 2.

[0080] Comparative Example 5

[0081] Compared with Example 2, step (2) of Comparative Example 5 is different. Five times the total mass of the blue powder dye and pyridone powder dye is added as sodium hydrosulfite. The other parameters are the same as those in Example 2.

[0082] Comparative Example 6

[0083] Compared with Example 2, step (2) of Comparative Example 6 is different. 0.05 times the total mass of the blue powder dye and pyridone powder dye is added as caustic soda. The other parameters are the same as in Example 2.

[0084] Comparative Example 7

[0085] Compared with Example 2, step (2) of Comparative Example 7 is different. Caustic soda with a total mass of 1.5 times that of the total mass of the blue powder dye and the pyridone powder dye is added. The other parameters are the same as those in Example 2.

[0086] Comparative Example 8

[0087] Compared with Example 2, step (2) of Comparative Example 8 is different. The material is reduced at 30°C for 1 min, and the other parameters are the same as those of Example 2.

[0088] Comparative Example 9

[0089] Compared with Example 2, step (3) of Comparative Example 9 is different. The dyed fiber fabric in step (2) is placed in a soap solution at 90°C and 5 g / L for 10 min. The other parameters are the same as those in Example 2.

[0090] Comparative Example 10

[0091] Compared with Example 2, step (3) of Comparative Example 10 is different. The dyed fiber fabric in step (2) is placed in a soap solution at 50°C and 0.5 g / L for 10 min and the other parameters are the same as those in Example 2.

[0092] Comparative Example 11

[0093] Compared with Example 2, step (3) of Comparative Example 11 is different. The dyed fiber fabric in step (2) is placed in a soap solution at 50°C and 5 g / L for 1 min and the remaining parameters are the same as those in Example 2.

[0094] Experimental Example 1: Performance Determination of Dyed Fiber Fabrics

[0095] Color depth (K / S), wet and dry rubbing fastness, and light fastness were determined for the dyed fiber fabrics prepared in Examples 1-27 and Comparative Examples 1-11. Color depth was measured using a colorimeter. Wet and dry rubbing fastness was tested according to GB / T 3920-2008 "Textiles - Tests for Color Fastness to Rubbing - Color Fastness to Color" and light fastness was tested according to GB / T 8427-2019 "Textiles - Tests for Color Fastness to Color Fastness to Artificial Light: Xenon Arc". At least three fabric samples were taken from each group for testing, and the average results were statistically analyzed. The specific test results are shown in Table 2 below.

[0096] Table 2

[0097]

[0098]

[0099]

[0100] Note: L* indicates brightness value; the larger the value, the brighter the light. a* indicates red-green value; a value indicates positive red light, and a value indicates negative green light. b* indicates yellow-blue value; a value indicates positive yellow light, and a value indicates negative blue light. L*, a*, and b* values ​​are used to describe the color variations of the fabric surface.

[0101] Examples 4-9 show that with increasing pyridone addition, the color of the dyed fabric shifts towards green, the color depth is significantly enhanced, and the wet and dry rubbing fastness is improved by 0.5 grades compared to Comparative Example 1, while the light fastness is improved by 1 grade. The dyeing effects of the fabrics in Examples 2 and 4-9 are as follows: Figure 1 As shown.

[0102] Comparing Examples 2 and 10-13, under the same conditions, using sodium hydrosulfite as a reducing agent resulted in a deeper color in the fabric after reduction dyeing. This indicates that sodium hydrosulfite has a better reduction effect on the dye. After full reduction, the soluble leuco pigment is more fully adsorbed and dyed on the fiber, thus obtaining a deeper color.

[0103] Comparing Examples 2 and 14-17, the fabrics dyed using sodium hydroxide and potassium hydroxide as alkali agents were both relatively dark, and the difference between the two was not significant. Considering cost and dyeing effect, sodium hydroxide is recommended as the optimal alkali agent.

[0104] Examples 18-23 demonstrate that the dyeing method is feasible for various fabrics, with cellulosic fibers being particularly well-suited, exhibiting deep color depth and excellent colorfastness. Tencel showed the deepest color depth because it has more amorphous regions than natural cellulosic fibers such as cotton and linen, making it easier to absorb and diffuse dye into the fiber interior, resulting in a higher dye uptake rate. While polyester and nylon showed lighter color depths, they still possess the potential for coloring and remain promising candidates. The dyeing effects of the fabrics in Examples 2 and 18-23 are as follows: Figure 2 As shown.

[0105] Comparative Example 1 shows that when blue dyeing is used alone, the fabric color is light and reddish, while in Example 2, the addition of pyridone results in a deeper color and improved fabric color.

[0106] Comparative Examples 2 and 3 show that when the amount of pyridone exceeds the optimal range, the fabric color is poor. Too low a pyridone content cannot achieve the purpose of improving the color; while too high a content will cause the color to turn greenish.

[0107] Comparative Examples 4 and 5 show that when the amount of sodium hydrosulfite exceeds the optimal range, the fabric color will change significantly. If too little sodium hydrosulfite is added, the reduction effect is poor, the pigment uptake is poor, and the fabric color is uneven; while if too much sodium hydrosulfite is added, the reduction effect is too strong, the fabric oxidation is too slow, and the fabric color will still be too light.

[0108] Comparative Examples 6 and 7 show that when the amount of sodium hydroxide added exceeds the optimal range, the fabric color is lighter. If too little sodium hydroxide is added, the reducing effect of the sodium hydrosulfite cannot be effectively utilized, resulting in a lighter fabric color; while if too much sodium hydroxide is added, the reducing effect of the sodium hydrosulfite will be too strong, and the high alkalinity will cause pigment damage, still resulting in a lighter color.

[0109] Comparative Example 8 shows that if the reduction time is too short, the dye cannot be fully reduced by the reducing agent, resulting in less pigment uptake and a lighter fabric color.

[0110] Comparative Example 9 shows that washing with soap at 90℃ causes a large amount of dye to fall off, greatly reducing the amount of color gained from the fabric and resulting in a lighter fabric color.

[0111] Comparative Example 10 shows that when the amount of soaping agent is too small, too much floating dye will be caused, resulting in a significant decrease in the color fastness of the fabric.

[0112] Comparative Example 11 shows that too short a rinsing time can also cause a large amount of floating dye to remain unwashed, resulting in a significant decrease in the color fastness of the fabric.

[0113] Experimental Example 2: Determination of the uptake rates of blue and pyridone on dyed fabrics

[0114] The dyeing rates of blue and pyridone on the fabrics dyed in Examples 4-9 above were measured:

[0115] (1) Fabric stripping: Cut 0.1000g of yarn from the same section of yarn, and use a total of 100mL of DMSO to strip the yarn in 3 times. Each time, soak the yarn in 30mL of DMSO, shake for 30min, and collect all the stripping solution.

[0116] (2) Detection methods: Blue staining was detected using a spectrophotometer with an absorption wavelength of 612 nm. The stripping solution was diluted to a suitable factor according to the color depth, and the absorbance value was measured. Pyridone content was detected by high-performance liquid chromatography (HPLC): the stripping solution was diluted to a suitable factor, and a ZORBAX Eclipse Pluse C18 HPLC system was used.

[0117] A 4.6 x 250 mm 5-Micron column was used with methanol-water (5:95, v / v) as the mobile phase, isocratic elution was performed at a flow rate of 0.6 mL / min, a column temperature of 35 °C, a detection wavelength of 400 nm, an injection volume of 10 μL, and a run time of 15 minutes.

[0118] (3) Preparation of the standard curve: Preparation of the standard curve for Guanlan: A UV spectrophotometer was used to measure the concentration of Guanlan standard at concentrations of 1, 2, 3…16, 17, and 18 μg in 1 ml of DMSO. After ultrasonic dissolution, the corresponding OD values ​​were measured at 612 nm using a spectrophotometer. The values ​​were recorded, and a standard curve was fitted with the x-axis representing concentration and the y-axis representing OD value: Y = 0.0694X + 0.0087, R 2 =0.999. Preparation of pyridinone standard curve: High performance liquid chromatography was used to determine the standard. A 10 mg / mL stock solution of pyridinone standard was prepared and diluted to 0.200-1.000 mg / L to prepare five standard samples with different concentration gradients. The detection was carried out according to the detection method in (2), and the peak area was recorded. With the peak area as the abscissa and the standard concentration as the ordinate, the standard curve equation was obtained by fitting: Y = 1.0 × 10 -7 x-0.0865, R2=0.9995.

[0119] (4) Calculation: Substitute the absorbance of the stripping solution at 612 nm and the peak area of ​​the pyridone detection peak into the standard curve equations of the blue and pyridone, respectively, and calculate the contents of blue and pyridone after unit conversion. At least 3 fabric pieces were taken from each group for testing, and the average results were statistically analyzed. The specific test results are shown in Table 3 below.

[0120] Table 3. Percentage of blue and pyridone content on the fabric surface after dyeing.

[0121]

[0122] The content analysis in Table 3 above shows that pyridone can effectively dye the fibers, thus improving the color. The proportions of indigo and pyridone before and after dyeing differ slightly, but are essentially the same as the initial proportions, indicating that indigo and pyridone have similar dyeing states on the fibers. Therefore, the ratio of indigo to pyridone can be adjusted according to the desired color.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of protection of this application. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the substance and scope of the technical solutions of this application.

Claims

1. A biological blue dye, characterized in that, The bio-blue dye includes blue dye, pyridone dye, reducing agent and alkali agent; The mass fraction of the indigo dye is 3 to 10 parts; The mass of the pyridone dye is 0.1% to 55% of the mass of the blue pendant; The structural formula of the pyridone dye is shown below: 。 2. The biological blue dye according to claim 1, wherein The mass of the reducing agent is 1.0 to 2.0 times the total mass of the blue dye and the pyridone dye.

3. The biological blue dye according to claim 1, wherein The mass of the alkali agent is 0.1 to 0.5 times the total mass of the blue dye and the pyridone dye.

4. A dyeing liquor characterised in that, The staining solution contains the biological blue dye as described in any one of claims 1 to 3.

5. The method for preparing a dyeing liquor according to claim 4, characterized in that, Includes the following steps: S1. Weigh out the indigo dye and pyridone dye in a quantitative amount and mix them evenly. S2. Prepare a pigment suspension of 3~10g / L for the blue dye, add 1.0~2.0 times the total mass of the blue dye and pyridone dye as reducing agent, and mix and stir evenly with 0.1~0.5 times the total mass of the blue dye and pyridone dye as alkali agent to reduce the dyeing solution.

6. The method for preparing a dyeing liquor according to claim 5, characterized in that, In step S1, 3 to 10 parts by weight of indigo dye are added to water to prepare a pigment suspension of 3 to 10 g / L.

7. The preparation method of the dyeing liquid according to claim 5, characterized in that, In step S2, the temperature of the reducing material is 25~80℃, and the reducing time is 10~90 min.

8. Use of the dyeing liquor according to claim 4 for dyeing fabrics, characterized in that, The fabric is immersed in the dyeing solution as described in claim 4 for dyeing, oxidized in air, and dyed repeatedly to obtain the dyed fiber fabric. Prepare a soap solution with a liquor ratio of (100~300):1, rinse the dyed fiber fabric in the soap solution, and obtain the dyed fiber fabric.

9. Use according to claim 8, wherein the compound is ###0002### The staining temperature is 20~60℃, and the staining time is 0.1~10min; And / or, the air oxidation time is 1~10 min; And / or, the rinsing temperature is 25~60℃, and the rinsing time is 5~30min.

10. The application as described in claim 8, characterized in that, The mass concentration of the soap solution is 1~10g / L.

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