Process for producing a dye composition and dye composition

Abstract

A method for manufacturing a dye composition and the dye composition thereof, the method comprising adding a provided blue dye raw material to a large amount of cold water for a desalting and purification process, such that the salt content in the blue raw material solution after the desalting and purification process is less than 35% of the salt content in the blue raw material solution before the desalting and purification process, and then adding a co-solvent and a co-solvent to obtain the dye composition, wherein the co-solvent increases the solubility of the blue dye, and the co-solvent maintains the solubility of the dye at a certain level, and the dye composition prepared by the method has high solubility and, while maintaining a certain solubility, has good color fastness and color uptake.

Description

Technical Field

[0001] The present invention relates, in some embodiments thereof, to the technical field of manufacturing dye compositions, and more particularly, but not limited to, to a method of manufacturing a dye composition and a dye composition thereof. Background Technology

[0002] Dyeing is an important process for adding color to textiles and other materials, and it holds a significant economic position in the dyeing and finishing industry, the textile industry, and other related industries. Acid dyes are among the most important dyes used in this process.

[0003] Acid dyes are a class of water-soluble dyes with acidic groups in their structure. They can bond with amino groups in protein fiber molecules or polyamide fiber molecules via ionic bonds and are suitable for acidic, weakly acidic, or neutral conditions. Acid dyes are mainly used for dyeing and printing on protein fibers such as wool and silk, as well as polyamide fibers. They can also be used for coloring leather, inks, paper, cosmetics, and food colorings.

[0004] The solubility of acid dyes in water is an important factor in their effectiveness. The solubility determines how easily acid dyes dissolve and are applied to materials. If the solubility is extremely low, they cannot be dyed on hydrophilic fibers, which will result in dye spots during dyeing and uneven fabric color.

[0005] Therefore, acid dyes with excellent colorfastness ensure that dyed materials retain their color after exposure to environmental factors such as light, water, and heat. Thus, high solubility in water and excellent colorfastness are important indicators for acid dyes.

[0006] One key factor affecting the solubility of acid dyes is the concentration of salts in the semi-finished dye product. The higher the degree of purification of the semi-finished dye product, the higher its solubility. More specifically, the higher the salt concentration in the semi-finished dye product (unpurified or poorly purified), the lower the solubility of the dye. Acid dyes (such as blue dyes) prepared using current processes have poor solubility, approximately only 2 grams per liter (g / L), due to the high salt content. At around 20°C, the solubility further decreases to only about 1 g / L.

[0007] Therefore, in existing technologies, to improve dye solubility, a dispersant is added to the semi-finished dye, and it is then ground and dispersed in a mill for an extended period until the dye molecules are smaller (e.g., ground and dispersed to an average particle size of approximately 800 nm), thereby increasing the dye's solubility. However, the grinding structure of the mill is metallic, and prolonged grinding can lead to the precipitation of metal ions from the grinding structure. This results in the presence of heavy metal residues such as chromium (Cr), cobalt (Co), and iron (Fe) in the ground dye. These heavy metals are dangerous from a toxicological and environmental perspective, and will have adverse health effects on the subsequent application of the dye to textiles and subsequent contact with the human body. Therefore, they should be excluded. Furthermore, adding a step to remove residual heavy metals requires additional costs and procedures, and the washing and wastewater discharge of heavy metals will also cause environmental problems such as dye wastewater treatment. Summary of the Invention

[0008] Therefore, the purpose of this invention is to provide a dye composition that solves the problem in the prior art where, in order to improve the solubility of acid dyes, a grinder is used to grind the dye molecules to a smaller particle size, resulting in heavy metal residues in the ground dye.

[0009] This invention provides a method for manufacturing a dye composition, comprising the following steps: providing a blue dye raw material; adding water to the blue dye raw material to form a blue raw material solution, and subjecting the blue raw material solution to a desalting purification process, wherein the desalting purification process includes mixing the blue raw material solution with water in a ratio between 1:5 and 1:100 to perform desalting purification, reducing the salt content in the blue raw material solution treated by the desalting purification process to less than 35% of the salt content in the blue raw material solution not treated by the desalting purification process; drying the purified blue raw material solution to form a blue dye; and mixing the blue dye with a cosolvent and a cosolvent to obtain the dye composition.

[0010] In one embodiment of the present invention, the blue dye comprises the structure of the following chemical formula (1), and the cosolvent comprises polyvinylpyrrolidone;

[0011]

[0012] In one embodiment of the invention, the dye composition further includes a cosolvent, said cosolvent being one of the groups consisting of soluble starch and glucose.

[0013] In one embodiment of the invention, the amount of the cosolvent is 5 to 65 parts by weight relative to 100 parts by weight of the blue dye, and the amount of the cosolvent is 35 to 95 parts by weight.

[0014] In one embodiment of the present invention, the dye composition further includes an acid dye.

[0015] In one embodiment of the present invention, the weight ratio of the blue dye to the cosolvent ranges from 1:0.02 to 0.4.

[0016] In one embodiment of the present invention, the weight ratio of the blue dye to the acid dye is in the range of 1:0.04 to 0.2.

[0017] In one embodiment of the present invention, the weight ratio of blue dye to co-solvent can be in the range of 1:0.1 to 0.7.

[0018] In one embodiment of the present invention, in step S20, the desalting and purification process is carried out by adding a large amount of cold water to the blue raw material solution, wherein the ratio of the blue raw material solution to the cold water is in the range of 1:10 to 1:30.

[0019] On the other hand, the present invention also provides a dye composition prepared according to the manufacturing method of the dye composition described above. The dye composition includes a blue dye, a co-solvent, and a co-solvent, and optionally further includes an acid dye.

[0020] The present invention provides a method for manufacturing a dye composition and a dye composition thereof. By purifying the dye raw material solution with a large amount of cold water, a large amount of salts in the dye raw material solution are removed, resulting in a significantly lower salt content in the blue raw material solution after the desalting and purification process compared to the blue raw material solution without the desalting and purification process. A co-solvent is added to improve the dye's solubility, and a co-solvent can be selectively added to maintain the dye's solubility at a certain level. In other words, desalting the dye raw material solution to obtain a highly purified dye raw material solution can improve the dye's solubility. The co-solvent and co-solvent respectively improve and maintain the dye's solubility, further increasing the dye's coloring strength. This reduces the amount of dye used, making it not only environmentally friendly but also lowering production costs. More importantly, the desalting and purification process in the dye composition manufacturing method of the present invention eliminates the need for prolonged grinding of the dye, avoiding the problem of heavy metal residues in the ground dye caused by grinding dye molecules to small particles. Attached Figure Description

[0021] The invention will be more fully understood and appreciated through the following detailed description, taken in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic flowchart illustrating a method for manufacturing a dye composition according to an embodiment of the present invention. Detailed Implementation

[0023] The technical content and detailed description of this invention are now explained in conjunction with the accompanying drawings:

[0024] Please refer to Figure 1 This diagram illustrates a flow chart of a method for manufacturing a dye composition according to an embodiment of the present invention. Figure 1 As shown, the method for manufacturing the dye composition of the present invention includes the following steps:

[0025] Step S10: Provide a blue dye raw material;

[0026] Step S20: Add water to the blue dye raw material to form a blue raw material solution, and perform a desalting purification process on the blue raw material solution; wherein, the desalting purification process includes mixing the blue raw material solution with water in a ratio between 1:5 and 1:100 to perform desalting purification, so that the salt content in the blue raw material solution treated by the desalting purification process is reduced to less than 35% of the salt content in the blue raw material solution that has not undergone the desalting purification process;

[0027] Step S30: Dry the purified blue raw material solution to form a blue dye; and

[0028] Step S40: Mix the blue dye with a co-solvent and a co-solvent to obtain the dye composition.

[0029] In step S10, the blue dye raw material can be a known dye, for example, in this embodiment, a blue acid dye, but the present invention is not limited thereto.

[0030] Because commercially available dyes typically have high salt content, they easily cause scale or soap scum to form in the dyeing vat or pipelines after repeated use, requiring frequent cleaning of equipment or replacement of pipelines. Therefore, in step S20, by adding a large amount of cold water to the blue raw material solution for desalination and purification, at least 65% of the salts in the blue raw material solution can be removed. In different embodiments, by adding a large amount of cold water to the blue raw material solution for desalination and purification, at least 80% of the salts in the blue raw material solution can be removed. By adding a large amount of cold water to the blue raw material solution for desalination and purification, the salt content in the blue raw material solution treated by the desalination and purification process is reduced to less than 35% of the salt content in the blue raw material solution that has not undergone the desalination and purification process. In other words, the salt content in the blue raw material solution after large-volume cold water desalination and purification is reduced by at least 65% compared to the salt content in the blue raw material solution that has not undergone large-volume cold water desalination and purification, i.e., the salt content is reduced to less than 35 wt%. Preferably, the salt content in the blue raw material solution after large-volume cold water desalination and purification is reduced by at least 80% compared to the salt content in the blue raw material solution that has not undergone large-volume cold water desalination and purification, i.e., the salt content is reduced to less than 20 wt%. In a preferred embodiment, the salt content in the blue raw material solution after large-volume cold water desalination and purification can be reduced to below 3 wt% compared to the salt content in the blue raw material solution without large-volume cold water desalination and purification, for example, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, or 3 wt%, depending on the impurities and salt content of the blue dye raw material and the actual requirements in the actual application. The present invention is not limited thereto.

[0031] In one embodiment, purification can be performed by reverse osmosis (RO) or by adding water to reduce the salt content in the dye raw material solution; the invention is not limited thereto. For example, the blue raw material solution can be passed through an RO filter membrane to make it "salt-free". It is worth mentioning that the aforementioned salts can be any inorganic salt, organic salt, or other salts that can be filtered by reverse osmosis.

[0032] Further, after drying to form the purified blue dye in step S30, in step S40, the desalted and purified blue dye is mixed with a co-solvent and a co-solvent to obtain the dye composition. The blue dye comprises the structure of the following chemical formula (1):

[0033]

[0034] In one embodiment, the dye with the chemical formula (1) structure used is a known compound that can be prepared by methods known in the literature, such as the method described in US Patent 2,008,796A. Specifically, for example, Acid Blue 129 can be reacted with formaldehyde to prepare the dye with the chemical formula (1); commercially available compounds can also be used.

[0035] The co-solvent used includes polyvinylpyrrolidone (PVP). The dye composition of the present invention, by including the co-solvent, can significantly improve the solubility of the blue dye in water, thereby increasing the solubility of the blue dye having the structure of chemical formula (1) in water from less than 5 g / L to more than 20 g / L; preferably, the solubility can be more than 30 g / L; more preferably, an excellent solubility effect of 50–70 g / L can be achieved.

[0036] Preferably, the weight average molecular weight (Mw) of the polyvinylpyrrolidone used in this invention is in the range of 40,000 to 60,000, more preferably 45,000 to 55,000, for example, PVP-K30.

[0037] Specifically, the weight ratio of the blue dye to the cosolvent can range from 1:0.02 to 0.4, more preferably from 1:0.1 to 0.4. Adjusting the weight ratio of the blue dye to the cosolvent can significantly improve the solubility of the blue dye in water. It is understood that this weight ratio range is not intended to limit the invention; any weight ratio range that achieves the effect of improving the solubility of the dye composition of the present invention does not depart from the spirit of the invention.

[0038] In one embodiment, the dye composition further includes a co-solvent, which is one of the groups consisting of soluble starch and glucose. The inventors of this application have discovered through numerous experiments that adding a co-solvent to the dye composition helps improve the dye's solubility in water, and selectively adding a co-solvent helps maintain the increased solubility at a certain level. More specifically, high solubility and excellent color fastness in water are important indicators of dyes, and the degree of purification of the dye itself is a factor affecting its solubility. By adding a large amount of cold water to the blue raw material solution for desalination purification, wherein the ratio of the blue raw material solution to cold water is in the range of 1:10 to 1:30, at least 65% or even at least 80% of the salts in the blue raw material solution can be removed. Therefore, improving the degree of purification is beneficial for improving dye solubility. Further adding a co-solvent to increase the dye's solubility in water, and adding a co-solvent to maintain the increased solubility at a certain level, achieves the effect of improving / maintaining solubility.

[0039] In one embodiment, the amount of the co-solvent is 5 to 65 parts by weight relative to 100 parts by weight of the acid dye, and the amount of the co-solvent is 35 to 95 parts by weight. The relative amounts of the co-solvent and co-solvent will have different effects on the solubility of the dye, and the detailed content ratios, i.e., the specific effects on solubility, will be described in the examples below.

[0040] In one embodiment of the present invention, the dye composition further includes an acid dye. Adding the acid dye to the dye composition of the present invention not only further increases solubility but also expands the color gamut of the dye composition, thereby increasing its market applicability.

[0041] Specifically, the weight ratio of the blue dye to the acid dye can range from 1:0.04 to 0.2. It is understood that this weight ratio range is not intended to limit the invention, and any weight ratio range that does not affect the effect of the dye composition of the present invention on improving solubility does not depart from the spirit of the invention.

[0042] On the other hand, the present invention also provides a dye composition prepared according to the manufacturing method of the dye composition described above. The dye composition includes a blue dye, a co-solvent, and a co-solvent, and optionally further includes an acid dye.

[0043] Although the blue dye with chemical formula (1) used in the dye composition of the present invention has a bright royal blue color and excellent color fastness, its solubility in water is poor (less than 5 g / L), which will cause uneven dyeing and staining spots when used for dyeing.

[0044]

[0045] Therefore, the inventors of this application are committed to maintaining the excellent color fastness of blue dyes with chemical formula (1) while improving their solubility in water, so as to solve the problem of staining spots during dyeing.

[0046] [Blue dye]

[0047] The dye composition of the present invention includes a blue dye comprising a dye having the structure of the above-described chemical formula (1). Although the dye having the structure of chemical formula (1) is presented in this specification as a sodium sulfonate salt, it is well known to those skilled in the art that it can also be presented in a free state (sulfonate ion) or other forms. Furthermore, the sodium salt of the structure of chemical formula (1) can also be replaced by other metal salts, such as alkali metal salts like lithium.

[0048] The dye with the chemical formula (1) structure used in this invention is a known compound that can be prepared by methods known in the literature, such as the method described in US Patent 2,008,796A. Specifically, for example, Acid Blue 129 can be reacted with formaldehyde to prepare the dye with the chemical formula (1); commercially available compounds can also be used.

[0049] [Cosolvent]

[0050] The cosolvent used in the dye composition of the present invention includes polyvinylpyrrolidone (PVP). By including the aforementioned cosolvent, the dye composition of the present invention can significantly improve the solubility of blue dye in water, thereby increasing the solubility of blue dye having the structure of chemical formula (1) in water from less than 5 g / L to more than 20 g / L; preferably, the solubility can be more than 30 g / L; more preferably, an excellent solubility effect of 50–70 g / L can be achieved.

[0051] Preferably, the weight average molecular weight (Mw) of the polyvinylpyrrolidone used in this invention is in the range of 40,000 to 60,000, more preferably 45,000 to 55,000, for example, PVP-K30.

[0052] Specifically, the weight ratio of blue dye to cosolvent can range from 1:0.02 to 0.4, with a preferred ratio of 1:0.1 to 0.4.

[0053] [Acid dyes]

[0054] The acid dyes used in the dye compositions of this invention include purple acid dyes, green acid dyes, or acid dyes of other colors. For example, purple acid dyes may include CI Acid Violet 48, and green acid dyes may include CI Acid Green 27. It is understood that the addition of any other acid dyes does not depart from the spirit of this invention, provided it does not affect the effect of the dye compositions of this invention in improving solubility. Further addition of acid dyes to the dye compositions of this invention can not only further increase solubility but also increase the color gamut of the dye compositions, thereby increasing their market applicability.

[0055] Specifically, the weight ratio of blue dye to acid dye can be in the range of 1:0.04 to 0.2, which can maximize the effect of increasing the color gamut of the dye composition.

[0056] [Cosolvent]

[0057] The co-solvent is a soluble starch, such as dextrin. In different embodiments, the co-solvent is glucose. In some embodiments, the co-solvent may even be selectively omitted. If the function of the co-solvent is to increase the solubility of the dye, then the effect of the co-solvent is to maintain the solubility of the dye at a certain level after the increase. Specifically, the weight ratio of blue dye to co-solvent can range from 1:0.1 to 0.7, which can most stably maintain the solubility of the dye at a certain solubility level (e.g., greater than 30 g / L).

[0058] [additive]

[0059] Without affecting the effect of the dye composition of the present invention on improving solubility, the dye composition of the present invention may include additives. Additives include fillers or other auxiliaries, such as colorants, ultraviolet absorbers, antibacterial agents, mildew inhibitors, antistatic agents, flame retardants, etc.

[0060] In application, the dye composition of the present invention can be used for dyeing according to conventional methods. For example, in the immersion dyeing method, a fabric (nylon cloth) is introduced into an aqueous dye bath with the pH value maintained between 3.5 and 6, and then the aqueous dye bath is stably heated from room temperature to a temperature of 100°C. The dye bath and the fabric are then held at this temperature for another 40 minutes, cooled, and the unfixed dye is rinsed off the fabric.

[0061] An aqueous dye bath may include an aqueous solution of 0.1% by weight of the dye composition, and may further include pH auxiliaries such as ammonium sulfate or leveling agents. It is understood that the aqueous dye bath may use different concentrations of dye composition or add different co-solvents and additives as needed.

[0062] Examples of preparation of dye compositions

[0063] Dye G-1:

[0064] Co-solvent: Polyvinylpyrrolidone (PVP-K30)

[0065] Co-solvent: soluble starch (dextrin) or glucose

[0066] Acid dye: CI Acid Violet 48

[0067] Preparation Example 1: Take 100 parts by weight of dye G-1, 10 parts by weight of polyvinylpyrrolidone and 90 parts by weight of soluble starch, pour them into a mixer and mix evenly to form dye composition 1.

[0068] Preparation Example 2: Take 100 parts by weight of dye G-1, 20 parts by weight of polyvinylpyrrolidone and 80 parts by weight of soluble starch, pour them into a mixer and mix evenly to form dye composition 2.

[0069] Preparation Example 3: Take 100 parts by weight of dye G-1, 30 parts by weight of polyvinylpyrrolidone and 70 parts by weight of soluble starch, pour them into a mixer and mix evenly to form dye composition 3.

[0070] Preparation Example 4: Take 100 parts by weight of dye G-1, 40 parts by weight of polyvinylpyrrolidone and 60 parts by weight of soluble starch, pour them into a mixer and mix evenly to form dye composition 4.

[0071] Preparation Example 5: Take 100 parts by weight of dye G-1, 50 parts by weight of polyvinylpyrrolidone and 50 parts by weight of soluble starch, pour them into a mixer and mix evenly to form dye composition 5.

[0072] Preparation Example 6: Take 100 parts by weight of dye G-1, 40 parts by weight of polyvinylpyrrolidone and 60 parts by weight of soluble starch, pour them into a mixer and mix evenly to form dye composition 6.

[0073] Preparation Example 7: Take 100 parts by weight of dye G-1, 40 parts by weight of polyvinylpyrrolidone and 60 parts by weight of glucose, pour them into a mixer and mix evenly to form dye composition 7.

[0074] Preparation Example 8: Take 100 parts by weight of dye G-1, 50 parts by weight of polyvinylpyrrolidone and 50 parts by weight of glucose, pour them into a mixer and mix evenly to form dye composition 8.

[0075] Preparation of Comparative Example 1: 100 parts by weight of dye G-1 and 4 parts by weight of soluble starch were mixed evenly in a mixer to form Comparative Composition 1.

[0076] Comparative Example 2: 100 parts by weight of dye G-1, 10 parts by weight of CI Acid Violet 48 and 4 parts by weight of soluble starch were poured into a mixer and mixed evenly to form Comparative Composition 2.

[0077] The composition ratios and water solubility results of the dye compositions 1-9 and comparative compositions 1-2 prepared in the above preparation examples 1-9 and preparation comparative examples 1-2 are shown in Table 1.

[0078] Table 1

[0079]

[0080]

[0081] Take 1g of the dye composition prepared in Examples 1-8 or Comparative Examples 1-2 above and place it in a 150ml beaker. Add 100ml of distilled water at 85℃ and stir until dissolved. Prepare a dye solution with a dyeing concentration of 1% and a bath ratio of 1:30. Place nylon Taffeta in the beaker and heat it to 100℃ at a rate of 1.5℃ / min. Keep it at this temperature for 45 minutes. After cooling, take out the dyed nylon fabric, wash it with water, dry it, and then test it.

[0082] The dyed nylon fabric was directly visually inspected to determine whether there were dye spots. X indicates obvious dye spots, ○ indicates no obvious dye spots under visual inspection, and ◎ indicates uniform color and no dye spots under visual inspection. The test results are shown in Table 2.

[0083] Table 2

[0084] staining spots Dye Composition 1 ○ Dye Composition 2 ◎ Dye Composition 3 ◎ Dye Composition 4 ◎ Dye Composition 5 ◎ Dye Composition 6 ◎ Dye Composition 7 ◎ Dye Composition 8 ◎ Comparative Composition 1 X Comparative Composition 2 X

[0085] As can be seen from the above examples and comparative examples, the dye composition, by including polyvinylpyrrolidone, can significantly improve the solubility of the blue dye having the structure of chemical formula (1) in water while maintaining excellent color fastness, thereby solving the problem that the blue dye is prone to staining spots during dyeing.

[0086] Compared to existing technologies, in the manufacturing method of the dye composition of the present invention, removing numerous impurities and complex salts from the dye raw materials through step S20 helps the dye composition manufactured by the method of the present invention maintain a solubility of 30 g / L to 70 g / L. This allows for better color fastness and color uptake while maintaining a certain solubility, and avoids the formation of soap scum due to the complexity of the salt composition, or, if soap scum does form, its simple composition makes it easier to remove chemically. Furthermore, the manufacturing method of the dye composition of the present invention removes a large amount of salts from the dye raw material solution by purifying it with a large amount of cold water. This results in a significantly lower salt content in the blue raw material solution after the desalting and purification process compared to the blue raw material solution before the desalting and purification process. A co-solvent is added to improve the dye solubility, and a co-solvent may be added to maintain the dye solubility at a certain level. In other words, desalting the dye raw material solution for purification yields a highly purified dye raw material solution, which improves the dye's solubility. The co-solvent and co-solvent, respectively, enhance and maintain the dye's solubility, further increasing the dye's coloring strength. This reduces the amount of dye used, helps lower the concentration of dyeing residue and heavy metal residue, and further reduces environmental harm and industrial process costs, achieving energy conservation, carbon reduction, and environmental sustainability. More importantly, the desalting and purification process in the dye composition manufacturing method of this invention eliminates the need for prolonged dye grinding, avoiding the problem of heavy metal residue in the ground dye caused by grinding dye molecules to small particles.

[0087] While the present invention has been disclosed with reference to several preferred embodiments, it is not intended to limit the invention, but merely to enable those skilled in the art to clearly understand the implementation of this specification. Any person skilled in the art can make various modifications, substitutions, and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method of producing a dye composition, characterized by: The method includes the following steps: Provide a blue dye raw material; Water is added to the blue dye raw material to form a blue raw material solution, and the blue raw material solution is subjected to a desalting purification process, wherein the desalting purification process includes mixing the blue raw material solution with water in a ratio between 1:5 and 1:100 to carry out desalting purification, so that the salt content in the blue raw material solution treated by the desalting purification process is less than 35% of the salt content in the blue raw material solution that has not been treated by the desalting purification process; The purified blue raw material solution is dried to form a blue dye; and The blue dye is mixed with a co-solvent and a co-solvent to obtain the dye composition.

2. The method for producing a dye composition according to claim 1, characterized by: The blue dye comprises the structure of the following chemical formula (1), and the cosolvent comprises polyvinylpyrrolidone; 3. The method for producing a dye composition according to claim 1, characterized by: The co-solvent is soluble starch.

4. The method for producing a dye composition according to claim 1, characterized by: The co-solvent is glucose.

5. The method of producing a dye composition according to claim 3 or 4, characterized by: The amount of the cosolvent is from 5 to 65 parts by weight relative to 100 parts by weight of the blue dye, and the amount of the cosolvent is from 35 to 95 parts by weight.

6. The method for producing a dye composition according to claim 1, characterized by: The dye composition further includes an acid dye.

7. The method of producing a dye composition according to claim 1, wherein: The weight ratio of the blue dye to the cosolvent ranges from 1:0.02 to 0.

4.

8. The method for producing a dye composition according to claim 6, characterized by: The weight ratio of the blue dye to the acid dye is in the range of 1:0.04 to 0.

2.

9. The method of producing a dye composition according to claim 1, characterized by: In step S20, the desalting and purification process is carried out by adding cold water to the blue raw material solution, wherein the ratio of the blue raw material solution to cold water is in the range of 1:10 to 1:

30.

10. A dye composition characterized by: The dye composition is prepared according to the manufacturing method of the dye composition according to claims 1 to 10.

Images