Biological blue dye, staining solution and preparation method and application thereof

Abstract

The invention relates to the technical field of dyeing and finishing, and particularly discloses a biological blue dye, a dyeing solution as well as a preparation method and application thereof. The pyridone dye is mixed into the ornamental blue dye, the ornamental blue light is adjusted, the ornamental blue light shifts to the cyan light, and the red light effect is weakened, so that the problems of reddish color and insufficient dyeing depth after ornamental blue dyeing can be effectively solved, and along with the increase of the mixing proportion of the pyridone dye, higher color depth can be obtained under the same dyeing concentration and number of times, and the dyeing effect is improved. The dry and wet rubbing fastness of the dyed cloth is improved by 0.5 level.

Description

TECHNICAL FIELD

[0001] The application relates to the dyeing and finishing technical field, in particular to a biological blue dye, a dyeing liquid and a preparation method and application thereof. BACKGROUND

[0002] As a new type of blue biological dye, Guanlan belongs to natural amino acid vat dyes. The dye uses amino acids as the main raw material and is prepared through advanced biological fermentation technology. In the production process, zero aniline and zero formaldehyde emissions are realized, effectively solving the environmental pollution problems and safety hazards existing in the production process of traditional dyes.

[0003] Compared with traditional chemical dyes, Guanlan dyes have excellent performance in many aspects. First, it has excellent color saturation performance and can bring bright and long-lasting color to fabrics. Second, Guanlan dyes have excellent color fastness, and the color remains bright even after multiple washes. Most importantly, Guanlan dyes are far ahead in ecological friendliness and fully meet the requirements of modern industry for green and environmentally friendly products.

[0004] Under the action of a reducing agent, Guanlan can be converted into soluble leuco acid, which has good affinity for cellulose fibers. Guanlan-dyed fabrics show bright blue color, but there are still problems of red color light and insufficient dyeing depth, which limit its application in high-end textiles. Using traditional chemical toning agents such as fluorescent whitening agents will reduce dyeing depth and color fastness, and there is currently no effective solution to significantly improve the color light of Guanlan. SUMMARY

[0005] The purpose of the present application is to overcome the problem of red color light of Guanlan-dyed fabrics and provide a biological blue dye, a dyeing liquid, a preparation method and application thereof.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] The present application provides a biological blue dye, which comprises Guanlan dye, pyridone dye, reducing agent and alkali agent.

[0008] The mass fraction of the Guanlan dye is 3-10 parts.

[0009] The mass of the pyridone dye is 0.1%-55% of the mass of Guanlan.

[0010] Pyridone dye (5-hydroxy-3-imino pyridine-2,6-dione, derived from patent authorization publication number CN119899881B) is a new type of yellow dye, which is prepared by microbial fermentation and does not contain heavy metals and other toxic and harmful substances compared with traditional yellow dyes.

[0011] In the technical solution of the application, the pyridone dye (5-hydroxy-3-imino pyridine-2, 6-dione) is mixed in the observation blue dye, which makes the blue light shift to the red light, effectively solves the problem of insufficient dyeing depth after observation blue dyeing, and under the same dyeing concentration and number of passes, higher color depth can be obtained, and the dry and wet rubbing fastness of the dyed fabric is improved by 0.5 levels.

[0012] Among them, mixing 0.1% to 55% of the pyridone dye in the observation blue dye can achieve the weakening of the red light of the observation blue, when the mixed amount of the pyridone dye is <0.1%, the red light elimination effect is not obvious, and when the mixed amount of the pyridone dye is >55%, the overall dyed fabric is biased to green.

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

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

[0015] As a preferred embodiment of the biological blue dye described in the application, the mass of the reducing agent is 1.0 to 2.0 times the total mass of the observation blue dye and the pyridone dye.

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

[0017] As a preferred embodiment of the biological blue dye described in the application, the mass of the alkali agent is 0.1 to 0.5 times the total mass of the observation blue dye and the pyridone dye.

[0018] The application adopts the above-mentioned addition amount, and under the addition amount of the alkali agent, the pH of the pyridone dye solution can be maintained at 8.0 to 9.0, and the stability of the observation blue and the pyridone structure is ensured.

[0019] The application provides a dyeing solution, which comprises the above-mentioned biological blue dye.

[0020] The application also provides a preparation method of the above-mentioned dyeing solution, which comprises the following steps:

[0021] S1, quantitatively weighing the observation blue dye and the pyridone dye and mixing them uniformly;

[0022] S2, the observed blue dye is configured as a pigment suspension of 3-10 g / L, the reducing agent is added in an amount of 1.0-2.0 times the total mass of the observed blue dye and the pyridone dye, and the alkali agent is mixed with the reducing agent in an amount of 0.1-0.5 times the total mass of the observed blue dye and the pyridone dye to obtain a dyeing solution.

[0023] As a preferred embodiment of the preparation method of the dyeing solution, in step S1, the observed blue dye is configured as a pigment suspension of 3-10 g / L.

[0024] As a preferred embodiment of the preparation method of the dyeing solution, in step S2, the temperature of the reducing agent is 25-80°C, and the time of the reducing agent is 10-90 min.

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

[0026] The reducing agent prepared under the above conditions can ensure that the pyridone dye is completely reduced.

[0027] The application also provides the use of the dyeing solution in fabric dyeing, wherein the fabric is dyed by being soaked in the dyeing solution, air oxidation, and repeated dyeing to obtain dyed fabric.

[0028] The dyed fabric is rinsed in a soapy solution prepared according to a bath ratio of (100-300):1 to obtain dyed fabric.

[0029] The bath ratio of the soapy solution to the fabric is (100-300):1 to ensure sufficient washing of the dyed fabric and removal of surface impurities and floating color.

[0030] As a preferred embodiment of the use, the dyeing temperature is 20-60°C, and the dyeing time is 0.1-10 min.

[0031] And / or, the air oxidation time is 1-10 min.

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

[0033] The higher the temperature, the stronger the washing effect of the soapy solution. If the rinsing temperature exceeds 60°C, the pyridone pigment may be damaged. If the rinsing time is less than 5 min, the impurities and floating color on the fabric surface are not removed sufficiently. If the rinsing time is more than 30 min, the washing effect of the soapy solution no longer changes.

[0034] As a preferred embodiment of the use, the number of repeated dyeing is 1-10 times.

[0035] The present application has different color depth according to different dyeing track numbers, and the dyeing depth gradually increases with the increase of the track number.

[0036] As a preferred embodiment of the application, the mass concentration of the soap solution is 1-10 g / L.

[0037] In the technical solution of the present application, if the mass concentration of the soap solution is less than 1 g / L, the impurities and floating color on the fabric cannot be removed sufficiently, and if the mass concentration of the soap solution is higher than 10 g / L, the washing effect of the soap solution no longer changes, resulting in waste of soap pieces.

[0038] In some specific embodiments, the fabric comprises at least one of cotton, flax, silk, wool, leather, Tencel, polyester, and nylon. More preferably, the fabric is at least one of cotton, flax, silk, wool, Tencel, polyester, and nylon.

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

[0040] The present application provides a biological blue dye, a preparation method and application thereof. By mixing and blending pyridone (5-hydroxy-3-imino pyridine-2, 6-dione) dye into the observation blue dye, the present application adjusts the observation blue light, shifts the light to cyan, and weakens the red light effect, which can effectively solve the problems of red light shift and insufficient dyeing depth after observation blue dyeing. With the increase of the mixing ratio of pyridone dye, higher color depth can be obtained under the same dyeing concentration and track number, and the dry and wet rubbing fastness of the dyed fabric is improved by 0.5 grade. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The fabric dyeing effect diagram of Example 2 and Examples 4-9;

[0042] Figure 2 The fabric dyeing effect diagram of Example 2 and Examples 18-23. DETAILED DESCRIPTION

[0043] In order to better illustrate the purpose, technical solution and advantages of the present application, the present application will be further described below in combination with the drawings and specific embodiments.

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

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

[0046] The structural formula of the pyridone dye is as follows:

[0047]

[0048] Example 1

[0049] (1) Mixing of the powdery pigments: 3 parts of the powdery Obsidian dye and 0.1% of the powdery pyridone dye by mass of the powdery Obsidian dye are weighed and mixed uniformly using a powdering machine.

[0050] (2) Preparation of the dyeing solution and dyeing: 3 g / L of the pigment suspension is prepared by adding water to the Obsidian by mass, 1 times the total mass of the powdery Obsidian dye and the powdery pyridone dye by mass of the guar gum is added, and 0.1 times the total mass of the powdery Obsidian dye and the powdery pyridone dye by mass of the caustic soda is added, and the mixture is stirred uniformly, and the reduction dyeing is carried out at 25°C for 90 min to obtain a reduction dyeing solution. The cotton fabric is immersed in the reduction dyeing solution at 20°C for 10 min, air oxidation is carried out for 1 min, and the dyeing is repeated for 1 pass.

[0051] (3) Washing of the fabric: the fiber fabric dyed in step (2) is placed in a 25°C, 1 g / L soaping solution for 30 min, and is dried to obtain the dyed fiber fabric.

[0052] Example 2

[0053] (1) Mixing of the powdery pigments: 10 parts of the powdery Obsidian dye and 15% of the powdery pyridone dye by mass of the powdery Obsidian dye are weighed and mixed uniformly using a powdering machine.

[0054] (2) Preparation of the dyeing solution and dyeing: 10 g / L of the pigment suspension is prepared by adding water to the Obsidian by mass, 1.5 times the total mass of the powdery Obsidian dye and the powdery pyridone dye by mass of the guar gum is added, and 0.4 times the total mass of the powdery Obsidian dye and the powdery pyridone dye by mass of the caustic soda is added, and the mixture is stirred uniformly, and the reduction dyeing is carried out at 30°C for 30 min to obtain a reduction dyeing solution. The cotton fabric is immersed in the reduction dyeing solution at 30°C for 0.2 min, air oxidation is carried out for 2 min, and the dyeing is repeated for 1 pass.

[0055] (3) Washing of the fabric: the fiber fabric dyed in step (2) is placed in a 50°C, 5 g / L soaping solution for 10 min, and is dried to obtain the dyed fiber fabric.

[0056] Example 3

[0057] (1) Mixing of the powdery pigments: 5 parts of the powdery Obsidian dye and 55% of the powdery pyridone dye by mass of the powdery Obsidian dye are weighed and mixed uniformly using a powdering machine.

[0058] (2) Preparation of dyeing solution and dyeing: 5 g / L pigment suspension was prepared by adding water to Guanlan quality, adding 2 times of Guanlan powder dye and pyridine ketone powder dye total quality of sodium dithionite, adding 0.5 times of Guanlan powder dye and pyridine ketone powder dye total quality of caustic soda, mixing and stirring uniformly, reducing the material at 80℃ for 10 min, to obtain a reduction dyeing solution. The cotton fabric was immersed in the reduction dyeing solution at 60℃ for 0.1 min, air oxidation for 10 min, and repeated dyeing for 1 pass.

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

[0060] Examples 4-9

[0061] Compared with Example 2, the difference between Examples 4-9 is that the amount of pyridine ketone powder dye added is different, and the amount of pyridine ketone powder dye added is 0.3, 5, 10, 20, 30, and 50% of the mass of Guanlan powder dye, respectively, and the rest of the parameters are the same as Example 2.

[0062] Examples 10-13

[0063] Compared with Example 2, the difference between Examples 10-13 is that the reducing agent is different, and the reducing agent is respectively thiourea dioxide, sulfidic alkali, glucose, and ascorbic acid, and the rest of the parameters are the same as Example 2.

[0064] Examples 14-17

[0065] Compared with Example 2, the difference between Examples 14-17 is that the alkali agent and content added are different, and the alkali agent and content added are respectively 2.0 times of the total mass of Guanlan powder dye and pyridine ketone powder dye, or 0.4 times of the total mass of Guanlan powder dye and pyridine ketone powder dye, or 3.0 times of the total mass of Guanlan powder dye and pyridine ketone powder dye, or 1.5 times of the total mass of Guanlan powder dye and pyridine ketone powder dye, and the rest of the parameters are the same as Example 2.

[0066] Examples 18-23

[0067] Compared with Example 2, the difference between Examples 18-23 is that the type of fabric fiber dyed is different, and the type of fabric fiber dyed is respectively flax, silk, wool, Tencel, polyester, and nylon, and the rest of the parameters are the same as Example 2.

[0068] Examples 24-27

[0069] The difference between Examples 24-27 and Example 2 is that the dyeing passes are different, and the dyeing passes are 1, 4, 7, and 10 respectively, and the rest of the parameters are the same as those in Example 2.

[0070] Comparative Example 1

[0071] (1) Preparation of the dyeing solution: a certain amount of Obsidian powder dye was weighed and prepared into 10 g / L Obsidian dye, 1.5 times the mass of the Obsidian dye was added to the safener, and 0.4 times the total mass of the pigment was added to the caustic soda. After mixing and stirring, the reduction dyeing solution was obtained by reducing the material at 30°C for 30 min.

[0072] (2) Dyeing of the fabric: the cotton fabric was dyed in the reduction dyeing solution at 30°C for 0.2 min, and air-oxidized for 2 min, and 1 pass of dyeing was performed.

[0073] (3) Washing of the fabric: according to the bath ratio of 200:1 of the soap solution to the fabric, the fiber fabric after dyeing in step (2) was placed in a 5 g / L soap solution at 50°C for 10 min of rinsing, and then dried to obtain the dyed fiber fabric.

[0074] Comparative Example 2

[0075] Compared with Example 2, the difference of step (1) in Comparative Example 2 is that 10 parts of Obsidian powder dye and 0.05% of pyridone powder dye based on the mass of the Obsidian powder dye were weighed and mixed uniformly using a powdering machine; and the rest of the parameters are the same as those in Example 2.

[0076] Comparative Example 3

[0077] Compared with Example 2, the difference of step (1) in Comparative Example 3 is that 10 parts of Obsidian powder dye and 60% of pyridone powder dye based on the mass of the Obsidian powder dye were weighed and mixed uniformly using a powdering machine; and the rest of the parameters are the same as those in Example 2.

[0078] Comparative Example 4

[0079] Compared with Example 2, the difference of step (2) in Comparative Example 4 is that 0.5 times the total mass of the Obsidian powder dye and the pyridone powder dye was added to the safener, and the rest of the parameters are the same as those in Example 2.

[0080] Comparative Example 5

[0081] Compared with Example 2, the difference of step (2) in Comparative Example 5 is that 5 times the total mass of the Obsidian powder dye and the pyridone powder dye was added to the safener, and the rest of the parameters are the same as those in Example 2.

[0082] Comparative Example 6

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

[0084] Comparative Example 7

[0085] Compared with Example 2, the step (2) of Comparative Example 7 is different, 1.5 times the total mass of the Obsidian powder dye and the pyridone powder dye is added with caustic soda, and the rest of the parameters are the same as Example 2.

[0086] Comparative Example 8

[0087] Compared with Example 2, the step (2) of Comparative Example 8 is different, the reduction material is added at 30℃ for 1min, and the rest of the parameters are the same as Example 2.

[0088] Comparative Example 9

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

[0090] Comparative Example 10

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

[0092] Comparative Example 11

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

[0094] Test Example 1, Performance Determination of Dyed Fiber Fabric

[0095] For the dyed fiber fabric prepared in the above Examples 1-27 and Comparative Examples 1-11, the color depth (K / S), dry and wet rubbing fastness, and light fastness were determined, wherein the color depth was determined using a colorimeter, the dry and wet rubbing fastness was determined according to GB / T 3920-2008 “Textiles-Color fastness test-Rubbing fastness”, and the light fastness was determined according to GB / T 8427-2019 “Textiles-Color fastness test-Color fastness to artificial light: Xenon arc”. At least 3 pieces of cloth were taken for detection in each group, the average result was counted, and the specific results are shown in Table 2.

[0096] Table 2

[0097]

[0098]

[0099]

[0100] Note: L* indicates lightness value, the larger the value, the brighter; a* indicates red-green value, positive value is red light, negative value is green light; b* indicates yellow-blue value, positive value is yellow light, negative value is blue light. L*, a*, b* values are used to describe fabric color light changes.

[0101] Examples 4-9 show that with the increase of the addition ratio of pyridone, the color light of the dyed fabric shifts to the green light direction, the color depth is significantly enhanced, and the dry and wet fastness is improved by 0.5 grade compared with Comparative Example 1, and the light fastness is improved by 1 grade. The fabric dyeing effects of Examples 2, 4-9 are shown in Figure 1 .

[0102] Comparative Example 2 and Examples 10-13, under the same conditions, using sulfonal as a reducing agent, the fabric after reduction dyeing is deeper in color, indicating that sulfonal has better reduction effect on dyes, and after full reduction, the adsorption and dyeing of soluble leuco bodies on the fiber is more sufficient, thus obtaining deeper color depth.

[0103] Comparative Example 2 and Examples 14-17, using sodium hydroxide and potassium hydroxide as alkali agents for dyeing, the fabric color depth is relatively deep, and the difference between the two is not large, considering the cost and dyeing effect, sodium hydroxide is recommended as the optimal alkali agent.

[0104] Examples 18-23 show that the dyeing method has good dyeing feasibility for various fabrics, among which cellulose fibers are more suitable for this dyeing method, and the color depth after dyeing is deeper, and the fastness is excellent. Among them, the color depth of Tencel is the deepest, which is because Tencel has more amorphous regions than cotton, hemp and other natural cellulose fibers, and is easier to adsorb and spread the dye to the inside of the fiber, and has a higher dyeing rate. The color depth of polyester and nylon is shallower, but there is still a possibility of coloring, and still has application prospects. The fabric dyeing effects of Examples 2, 18-23 are shown in Figure 2 .

[0105] Comparative Example 1 shows that only blue dyeing, the fabric color is red, and the color light is improved after adding pyridone in Example 2.

[0106] Comparative Examples 2 and 3 show that when the amount of pyridone exceeds the optimal range, the fabric color light is poor, and the content of pyridone is too low to achieve the purpose of color light improvement; while the content is too high, it will cause the color light to be obviously green.

[0107] Comparative Examples 4 and 5 show that when the sodium hydrosulfite is out of the optimal range, the fabric color will change greatly. If the amount of sodium hydrosulfite is too small, the reduction effect is poor, the dyeing effect of the pigment is poor, and the fabric color is light and dark; if the amount of sodium hydrosulfite is too large, the reduction effect is too strong, the fabric is oxidized too slowly, and the fabric color is still too light.

[0108] Comparative Examples 6 and 7 show that when the amount of sodium hydroxide is out of the optimal range, the fabric color is light. If the amount of sodium hydroxide is too small, the reduction effect of sodium hydrosulfite cannot be efficiently exerted, which causes the fabric color to be light; if the amount of sodium hydroxide is too large, the reduction effect of sodium hydrosulfite is too strong, and the high alkalinity causes the pigment to be damaged, which still causes the color to be light.

[0109] Comparative Example 8 shows that if the reduction time is too short, the dye cannot be fully reduced by the reducing agent, which causes the dyeing amount of the pigment to be small, and the fabric color to be light.

[0110] Comparative Example 9 shows that soaping at 90°C can cause a large amount of the dyed pigment to fall off, the color yield of the fabric is greatly reduced, and the fabric color is light.

[0111] Comparative Example 10 shows that if the amount of soaping agent is too small, it can cause too much floating color, which causes the color fastness of the fabric to decrease significantly.

[0112] Comparative Example 11 shows that if the rinsing time is too short, a large amount of floating color cannot be washed away, which causes the color fastness of the fabric to decrease significantly.

[0113] Test Example 2, Determination of the Upyan Blue and Pyridone Dyeing Rate of the Fabric After Dyeing

[0114] The Upyan Blue and Pyridone dyeing rate of the fabric after dyeing in the above Examples 4-9 was determined:

[0115] (1) Fabric stripping: 0.1000 g of yarn was cut from the same section of yarn, and a total of 100 mL of DMSO was used to strip the yarn in three times, each time immersed in 30 mL of DMSO, oscillated for 30 min, and all the stripping liquids were collected.

[0116] (2) Detection method: Upyan Blue was detected by spectrophotometer, the absorption wavelength was set to 612 nm, the stripping liquid was diluted to the appropriate multiple according to the color depth, and the absorbance value was measured. The content of pyridone was detected by high performance liquid chromatography: the stripping liquid was diluted to the appropriate multiple, a ZORBAX Eclipse Pluse C18

[0117] 4.6x250mm 5-Micron column, the mobile phase was methanol-water (5:95, v / v), isocratic elution was performed, the flow rate was 0.6 mL / min, the column temperature was 35°C, the detection wavelength was 400 nm, the injection amount was 10 μL, and the running time was 15 minutes.

[0118] (3) Preparation of standard curve: The standard curve of observation blue was prepared by ultraviolet spectrophotometer. 1, 2, 3, …, 16, 17, 18 μg of observation blue standard was dissolved in 1 ml of DMSO, and the OD value was measured at 612 nm after ultrasonic dissolution. The standard curve was fitted with the concentration as the horizontal coordinate and the OD value as the vertical coordinate: Y = 0.0694X + 0.0087, R 2 = 0.999. Preparation of pyridone standard curve: The pyridone standard curve was prepared by high performance liquid chromatograph. The pyridone standard was prepared to 10 mg / mL stock solution, and was diluted to 0.200-1.000 mg / L to prepare five different concentration gradient standards. The peak area was recorded according to the detection method in (2). The standard curve equation was obtained by fitting the peak area as the horizontal coordinate and the standard concentration as the vertical coordinate: Y = 1.0 x 10 -7 x-0.0865, R2= 0.9995.

[0119] (4) Calculation: The absorbance of stripping solution at 612 nm and the peak area of pyridone detection peak were brought into the standard curve equation of observation blue and pyridone, respectively, and the content of observation blue and pyridone was calculated after unit conversion. At least 3 pieces of cloth were taken for detection in each group, and the average result was calculated. The specific results are shown in Table 3.

[0120] Table 3 Content of observation blue and pyridone on dyed cloth

[0121]

[0122] The content detection in Table 3 above shows that pyridone can effectively dye, so as to improve the color light. The content ratio of observation blue and pyridone before and after dyeing is slightly different, but basically the same as the ratio when feeding, which shows that the dyeing state of observation blue and pyridone on the fiber is close, and the ratio of observation blue and pyridone can be adjusted according to the desired color light.

[0123] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and do not limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present 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 indigo dye is present in parts by weight of 3 to 10 parts. The mass of the pyridone dye is 0.1% to 55% of the mass of blue indigo.

2. The biological blue dye as described in claim 1, characterized in that, 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 as described in claim 1, characterized in that, 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 staining solution, characterized 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 the staining solution as described in 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 3-10 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.

6. The method for preparing the staining solution as described in 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 method for preparing the staining solution as described in claim 5, characterized in that, In step S2, the temperature of the reducing material is 25-80℃, and the reducing time is 10-90 minutes.

8. The application of the dyeing solution as described in claim 4 in fabric dyeing, 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. The application as described in claim 8, characterized in that, The staining temperature is 20–60℃, and the staining time is 0.1–10 min; And / or, the air oxidation time is 1 to 10 minutes; And / or, the rinsing temperature is 25–60°C, and the rinsing time is 5–30 min.

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

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