Acid dye and method for producing same

Abstract

The invention relates to an acid dye and a manufacturing method thereof. The method comprises the following steps: providing a dye raw material; adding water into the dye raw material to form a dye raw material solution, and purifying the dye raw material solution, so that salts in the dye raw material solution are removed to only less than 15 weight percent; drying the purified dye raw material solution to form a purified dye; and adding 3-20 parts by weight of a coloring agent into 100 parts by weight of the dried purified dye, and fully mixing. Therefore, according to the acid dye and the manufacturing method thereof, the concentration of residual liquid can be reduced, and the acid dye has good color fastness and degree of dyeing during dyeing.

Description

Technical Field

[0001] The present invention relates to a dye and a method for making the same, and in particular to an acid dye and a method for making the same. Background Art

[0002] Dyeing is an important process for adding color to textiles and other materials. It plays an important economic role in the dyeing and finishing industry, textile industry and other related industries. Among them, acid dyes are one of the important dyes used in this process. Acid dyes are water-soluble dyes, mainly used for dyeing animal fibers such as wool and materials such as nylon. Acid dyes are usually used in an acidic environment, which helps to promote the adhesion of dyes to fibers. The solubility of acid dyes in water is an important factor in their effectiveness. Its solubility determines the difficulty of acid dyes to dissolve and apply to materials. If the solubility is insufficient, dye spots will form during dyeing, resulting in uneven color of the fabric.

[0003] In addition, impurities, inorganic salts and organic salts in general commercial dyes affect the solubility, color fastness, color uptake or hue of the dye after dyeing. If the color uptake or color fastness is insufficient, the dye solution used will have more or higher concentration of residual liquid, which is not only easy to damage the environment, but also for the users of acid dyes, it will take a lot of time and cost to make the residual liquid meet the wastewater discharge standards. Therefore, the industry is in urgent need of an acid dye that can reduce the concentration of residual liquid and has good color fastness and color uptake during dyeing and a method for manufacturing the same. Summary of the invention

[0004] Therefore, the object of the present invention is to provide an acid dye and a method for producing the same, so as to solve the problems in the prior art that the residual concentration of the acid dye after use is too high, and the color fastness and color uptake during dyeing are insufficient.

[0005] The present invention provides a method for producing an acid dye, comprising the following steps: providing a dye raw material; adding water to the dye raw material to form a dye raw material solution, and purifying the dye raw material solution so that salts in the dye raw material solution are removed to less than 15 weight percent (weight percent, wt%); drying the purified dye raw material solution to form a purified dye; and adding 3 to 20 weight parts of a coloring agent to 100 weight parts of the dried purified dye and fully mixing them.

[0006] In one embodiment of the present invention, the coloring agent is calcium chloride or magnesium chloride.

[0007] In one embodiment of the present invention, the dye raw material is CI (Colour Index) Acid Black 172, which has the following chemical formula:

[0008]

[0009] In one embodiment of the present invention, the dye raw material is CI acid blue 113, which has the following chemical formula:

[0010]

[0011] In one embodiment of the present invention, in the step of adding the coloring agent to the dried purified dye and fully mixing, the coloring agent is 15 parts by weight of calcium chloride.

[0012] In one embodiment of the present invention, in the step of adding the coloring agent to the dried purified dye and fully mixing, the coloring agent is 15 parts by weight of magnesium chloride.

[0013] In another aspect, the present invention further provides an acid dye produced by the acid dye production method of each of the above embodiments.

[0014] Compared with the prior art, the acid dye and the method for producing the same of the present invention help reduce the concentration of the dyeing residual liquid after the acid dye is used, and improve the color fastness and the coloring rate during dyeing. In addition, since the concentration of the dyeing residual liquid using the acid dye of the present invention is reduced, the acid dye and the method for producing the same of the present invention help to significantly reduce the wastewater treatment cost of the user, while achieving the purpose of environmental protection and energy saving and carbon reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 The present invention provides a schematic flow chart of a method for producing an acid dye according to an embodiment of the present invention.

[0017] Figure 2 The images are comparisons of the experimental example and the comparative example of the method for producing acid dyes according to the embodiment of the present invention.

[0018] Figure 3 It is a comparison image of an experimental example and a comparative example of a method for producing acid dyes according to another embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to further understand the features, technical means and specific functions and purposes of the present invention, more specific embodiments are listed and described in detail with drawings and figure numbers. The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments of the present invention.

[0020] See also Figure 1 , which is a schematic flow diagram of the method for producing an acid dye provided by an embodiment of the present invention. Specifically, the method for producing an acid dye of the present invention comprises the following steps:

[0021] Step S101: providing dye raw materials;

[0022] Step S102: adding water to the dye raw material to form a dye raw material solution, and purifying the dye raw material solution so that the salt in the dye raw material solution is removed to less than 15 weight percent (wt%);

[0023] Step S103: drying the purified dye raw material solution to form a purified dye; and

[0024] Step S104: adding 3 to 20 parts by weight of a coloring agent to 100 parts by weight of the dried purified dye and mixing them thoroughly.

[0025] In step S101, the dye raw material may be a currently known dye, for example, the dye raw material may be one or more of black acid dye, blue acid dye, red acid dye, green acid dye, brown acid dye, purple acid dye or green acid dye, but the present invention is not limited thereto.

[0026] Since the dyes currently available on the market usually have a high salt content, it is easy to form scale or soap scum in the dye vat or the pipeline in the process after repeated use, resulting in the need for frequent cleaning of the equipment in the process or replacement of the pipeline. Therefore, in step S102, the acid dye manufacturing method of the present invention purifies the dye raw material solution to reduce the salts in the dye raw material solution to less than 15wt%. In one embodiment, the dye raw material solution can be subjected to reverse osmosis purification to reduce the salts in the dye raw material solution to less than 5wt%. In a preferred embodiment, the dye raw material solution can be subjected to reverse osmosis purification to reduce the salts in the dye raw material solution to less than 3wt%, such as 1wt%, 1.5wt%, 2wt%, 2.5wt% or 3wt%, depending on the impurities and salt content of the dye raw material and actual needs during actual application, and the present invention is not limited thereto.

[0027] In one embodiment, purification can be performed by reverse osmosis (RO) or by adding water to reduce the salt ratio in the dye raw material solution, but the present invention is not limited thereto. For example, the dye raw material solution can be passed through an RO filter membrane to make the dye raw material solution reach a "salt-free" standard. It is worth mentioning that the aforementioned salt can be any inorganic salt, organic salt or other salt that can be filtered by reverse osmosis.

[0028] Furthermore, after drying in step S103 to form the purified dye, in step S104, 3 to 20 parts by weight of a coloring agent are added to every 100 parts by weight of the purified dye and the mixture is fully mixed. For example, the ratio of the coloring agent to the purified dye can be an integer multiple of 3 to 20 parts by weight, but the present invention is not limited thereto. In one embodiment, the coloring agent is calcium chloride or magnesium chloride. It should be noted that if the coloring agent is directly added and mixed with the dye raw material without purification in step S102, the solubility of the dye raw material will be greatly reduced to 5 grams per liter (g / L), making it difficult to color the dye raw material or unevenly colored, and prone to staining spots.

[0029] In one embodiment, the dye raw material is CI (Colour Index) Acid Black 172, which has the following chemical formula:

[0030]

[0031] In a preferred embodiment, the coloring agent is 15 parts by weight of magnesium chloride, and the dye raw material is CI acid black 172.

[0032] In a preferred embodiment, the coloring agent is 15 parts by weight of calcium chloride, and the dye raw material is CI Acid Black 172.

[0033] In one embodiment, the dye raw material is CI acid blue 113, which has the following chemical formula:

[0034]

[0035] In a preferred embodiment, the coloring agent is 15 parts by weight of magnesium chloride, and the dye raw material is CI acid blue 113.

[0036] In a preferred embodiment, the coloring agent is 15 parts by weight of calcium chloride, and the dye raw material is CI acid blue 113.

[0037] In the present specification, although the chemical formula structure of the aforementioned CI Acid Blue 113 or CI Acid Black 172 is presented, it is well known to those skilled in the art that it can also be presented in a free state or other forms.

[0038] The present invention further provides an acid dye manufactured by the acid dye manufacturing method of each of the above-mentioned embodiments. In one embodiment, the acid dye can be used for a dyeing, and the dyeing is dyed by the acid dye as described above. The dyeing can include a polyamide fiber material, and the polyamide fiber material can include synthetic polyamide fiber and natural polyamide fiber. Synthetic polyamide fiber can be exemplified by nylon, and natural polyamide fiber can be exemplified by animal hair such as wool. As the processing form of the polyamide fiber material, it can be exemplified by bulk fiber, yarn, fabric, knitting, etc.

[0039] [Experimental examples and comparative examples of acid dye production methods]

[0040] See also Figure 2 and Figure 3 , which are comparison images of an experimental example and a comparative example of an acid dye manufacturing method according to an embodiment of the present invention and another embodiment.

[0041] Figure 2 The left side is an experimental example of the method for producing an acid dye according to the present invention, using 100 parts by weight of CI Acid Black 172 as the dye raw material, using 15 parts by weight of calcium chloride as the coloring agent, and dyeing the residual liquid at a dyeing concentration of 3.5%. Figure 2 The right side shows the residual liquid after dyeing using the commercially available CI Acid Black 172 dye under the same conditions. Figure 2 It can be clearly seen that the residual liquid after dyeing with the dye in the experimental example can significantly reduce the dye concentration of the residual liquid compared with the residual liquid dyed in the comparative example, and the heavy metal chromium content in the residual liquid dyed in the experimental example is 0.88ppm, and the heavy metal chromium content in the residual liquid dyed in the comparative example is 1.95ppm as measured by high performance liquid chromatography (HPLC). In other words, the acid dye manufacturing method of the present invention can effectively reduce the heavy metal chromium content in the residual liquid dyed to 45% of the current commercially available dyes.

[0042] Figure 3 The left side is an experimental example of the method for producing an acid dye according to the present invention, using 100 parts by weight of CI Acid Black 172 as the dye raw material, using 15 parts by weight of calcium chloride as the coloring agent, and dyeing the residual liquid at a dyeing concentration of 6.0%. Figure 3The right side shows the residual liquid after dyeing under the same conditions using the commercially available CI Acid Black 172 dye as a comparative example. Figure 3 It can be clearly seen that the residual liquid after dyeing with the dye in the experimental example can significantly reduce the dye concentration of the residual liquid compared with the residual liquid dyed in the comparative example, and the heavy metal chromium content in the residual liquid dyed in the experimental example is 2.26ppm as measured by high performance liquid chromatography, and the heavy metal chromium content in the residual liquid dyed in the comparative example is 11.08ppm. In other words, the acid dye manufacturing method of the present invention can effectively reduce the heavy metal chromium content in the residual liquid dyed to 20% of the current commercially available dyes.

[0043] In other embodiments, in the experimental example of dyeing by the acid dye manufacturing method of the present invention, 100 parts by weight of CI acid blue 113 can be used as the dye raw material, 15 parts by weight of calcium chloride can be used as the coloring agent, and the dyeing is performed under the condition of a dyeing concentration of 3.5%. Compared with the comparative example in which only the commercially available CI acid blue 113 dye is used for dyeing under the same conditions, the dyeing residual liquid of the experimental example and the comparative example can significantly reduce the dye concentration and residue of the residual liquid after dyeing compared with the dyeing residual liquid of the comparative example.

[0044] Compared with the prior art, in the acid dye and the manufacturing method thereof of the present invention, after removing more impurities and more complex salts in the dye raw material through step S102, a colorant with higher purity is added through step S104, which helps the acid dye manufactured by the acid dye manufacturing method of the present invention to still maintain a solubility of 30g / L to 50g / L. In this way, it can have better color fastness and coloring rate while maintaining a certain solubility, and at the same time avoid the complex salt composition that easily generates soap scum, or when soap scum is generated, it can be more easily removed by chemical means due to its single composition.

[0045] Furthermore, the acid dye and the preparation method thereof of the present invention help to reduce the concentration of the dyeing residual liquid and the heavy metal residue, which can further reduce the harm to the environment and the cost of the industrial process, so as to achieve the purpose of energy saving, carbon reduction and environmental sustainability.

[0046] Although the present invention has been disclosed in a number of preferred embodiments, they are not intended to limit the present invention, but are only intended to enable those skilled in the art to clearly understand the implementation content of this specification. Any person skilled in the art in this field can make various changes, substitutions and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the attached patent application.

[0047] The above is a detailed introduction to an acid dye and a method for manufacturing the same provided in an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical scheme and core idea of ​​the present invention. A person of ordinary skill in the art should understand that the technical schemes described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical scheme to deviate from the scope of the technical schemes of the embodiments of the present invention.

Claims

1. A method for producing an acid dye, characterized in that: The method for producing an acid dye comprises the following steps: Provide dye raw materials; adding water to the dye raw material to form a dye raw material solution, and purifying the dye raw material solution so that the salt in the dye raw material solution is removed to less than 15 weight percent; drying the purified dye stock solution to form a purified dye; as well as 3 to 20 parts by weight of a toner are added to 100 parts by weight of the dried purified dye and mixed thoroughly.

2. The method for producing an acid dye according to claim 1, wherein: The coloring agent is calcium chloride or magnesium chloride.

3. The method for producing an acid dye according to claim 1, wherein: In the step of adding the coloring agent to the dried purified dye and mixing them thoroughly, the coloring agent is 15 parts by weight of calcium chloride.

4. The method for producing an acid dye according to claim 1, wherein: In the step of adding the coloring agent to the dried purified dye and fully mixing, the coloring agent is 15 parts by weight of magnesium chloride.

5. The method for producing an acid dye according to claim 1, wherein: The dye raw material is CI acid black 172, which has the following chemical formula:

6. The method for producing an acid dye according to claim 5, wherein: In the step of adding the coloring agent to the dried purified dye and mixing them thoroughly, the coloring agent is 15 parts by weight of calcium chloride.

7. The method for producing an acid dye according to claim 5, wherein: In the step of adding the coloring agent to the dried purified dye and fully mixing, the coloring agent is 15 parts by weight of magnesium chloride.

8. The method for producing an acid dye according to claim 1, wherein: The dye raw material is CI acid blue 113, which has the following chemical formula:

9. The method for producing an acid dye according to claim 8, wherein: In the step of adding the coloring agent to the dried purified dye and mixing them thoroughly, the coloring agent is 15 parts by weight of calcium chloride.

10. The method for producing an acid dye according to claim 8, wherein: In the step of adding the coloring agent to the dried purified dye and fully mixing, the coloring agent is 15 parts by weight of magnesium chloride.

11. An acid dye produced by the method for producing an acid dye according to any one of claims 1 to 10.

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