Acid dyes and methods for producing the same

Abstract

This invention provides acid dyes and methods for producing the same. [Solution] The method includes the steps of: providing a dye raw material; adding water to the dye raw material to form a dye raw material solution; purifying the dye raw material solution to remove salts in the dye raw material solution to 15% by weight (weight percent, wt%) or less; drying the purified dye raw material solution to form a purified dye; and adding 3 to 20 parts by weight of a dyeing agent to 100 parts by weight of the dried purified dye and mixing thoroughly.

Description

Technical Field

[0001] The present invention relates to dyes and a method for producing the same, and particularly to acid dyes and a method for producing the same.

Background Art

[0002] Dyeing is an important process for coloring textile products and other materials, and plays a fairly important economic role in the dyeing and finishing industry, the textile industry and other related industries. Acid dyes are one of the important dyes used in this process. Acid dyes are water-soluble dyes and are mainly used for dyeing animal fibers such as wool and materials such as nylon. Acid dyes are usually used in an acidic environment that helps promote the attachment of the dye to the fiber. The solubility of acid dyes in water is an important factor in their effectiveness. The solubility determines the dissolution of acid dyes and the ease of application to materials. If the solubility is insufficient, dye spots are formed during dyeing, causing color unevenness on the fabric.

[0003] In addition, impurities, inorganic salts and organic salts in commercially available dyes generally all affect the solubility, dyeing fastness, dye uptake rate and hue after dyeing. If the dye uptake rate and dyeing fastness are insufficient, the residual liquid of the used dye solution will increase or the concentration will increase, which will not only lead to environmental damage, but also require a great deal of time and cost for users of acid dyes to conform the residual liquid to the drainage standards. Therefore, in the industry, there is a strong demand for acid dyes and a method for producing the same that can reduce the residual liquid concentration and have good dyeing fastness and dye uptake rate during dyeing.

Summary of the Invention

Problems to be Solved by the Invention

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

Means for Solving the Problems

[0005] The present invention provides a method for producing an acidic dye, comprising the steps of: providing a dye raw material; adding water to the dye raw material to form a dye raw material solution; purifying the dye raw material solution by adding water to reduce the salts in the dye raw material solution to a range greater than 5% by weight (wt%) and less than 15% by weight; drying the purified dye raw material solution to form a purified dye; and adding 3 to 20 parts by weight of a dyeing agent to 100 parts by weight of the dried purified dye and mixing thoroughly.

[0006] In one embodiment of the present invention, the dyeing 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, and has the following chemical formula: [ka] It holds.

[0008] In one embodiment of the present invention, the dye raw material is CI (Colour Index) Acid Blue 113, and has the following chemical formula: [ka] It holds.

[0009] In one embodiment of the present invention, in the step of adding the dyeing agent to the dried purified dye and mixing thoroughly, the dyeing agent is 15 parts by weight of calcium chloride.

[0010] In one embodiment of the present invention, in the step of adding the dyeing agent to the dried purified dye and mixing thoroughly, the dyeing agent is 15 parts by weight of magnesium chloride.

[0011] In another embodiment, the present invention further provides acid dyes produced by the methods for producing acid dyes of each of the embodiments described above.

[0012] Compared to conventional technologies, the acid dye and its manufacturing method of the present invention help to improve colorfastness and dyeing rate during dyeing by reducing the concentration of the residual dye solution after use of the acid dye. Furthermore, because the concentration of the residual dye solution using the acid dye of the present invention is reduced, the acid dye and its manufacturing method of the present invention significantly reduce the wastewater treatment costs for users and help to achieve the objectives of environmental protection, energy conservation, and reduction of carbon dioxide emissions. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a diagram showing a flow chart of a method for producing an acid dye according to one embodiment of the present invention. [Figure 2] Figure 2 shows comparative images of an experimental example and a comparative example of the method for producing an acid dye according to one embodiment of the present invention. [Figure 3] Figure 3 shows comparative images of experimental examples and comparative examples of acid dye production methods according to other embodiments of the present invention. [Modes for carrying out the invention]

[0014] To further understand the features, technical means, and specific functions and objectives of the present invention, more specific embodiments will be given and described in detail with reference to the drawings and reference numerals. The following descriptions of each embodiment will refer to the accompanying drawings to illustrate specific embodiments that may be used to carry out the present invention.

[0015] Figure 1 is a diagram showing a flow chart of a method for producing an acid dye according to one embodiment of the present invention. Specifically, the method for producing an acid dye according to the present invention includes the following steps S101 to S104. Step S101: Provide the dye raw materials. Step S102: Water is added to the dye raw material to form a dye raw material solution, and the dye raw material solution is purified to reduce the amount of salts in the dye raw material solution to a range greater than 5% by weight (wt%) and less than 15% by weight. Step S103: Dry the purified dye raw material solution to form a purified dye. Step S104: Add 3 to 20 parts by weight of a fixing agent to 100 parts by weight of the dried purified dye and mix well.

[0016] In step S101, the dye raw material may be a conventionally known dye. For example, it may be one or more of a black acid dye, a blue acid dye, a red acid dye, a green acid dye, a brown acid dye, a purple acid dye, or a green acid dye, but the present invention is not limited thereto.

[0017] Currently commercially available dyes generally have a high salt content. Therefore, after multiple uses, it is easy to form container debris or soap debris in the dyeing container or the pipeline in the process. As a result, it is necessary to frequently clean the devices in the process or replace the pipeline. Therefore, in step S102, the method for producing the acid dye of the present invention reduces the salts in the dye raw material solution to 15 wt% or less by purifying the dye raw material solution. It depends on the impurities, salt content of the dye raw material, and actual use, and the present invention is not limited thereto.

[0018] In one embodiment, the purification can be performed by reverse osmosis (RO) or by adding water to reduce the proportion of salts 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 filtration membrane to make the dye raw material solution meet the "salt-free" standard. It is worth mentioning that the salts may be any inorganic salt, organic salt, or other salts that can be filtered by reverse osmosis.

[0019] Furthermore, after drying in step S103 to form the purified dye, in step S104, 3 to 20 parts by weight of a fixing agent is added to 100 parts by weight of the purified dye and thoroughly mixed. For example, the fixing agent may be an integer multiple of 3 to 20 parts by weight relative to the proportion of the purified dye, but the present invention is not limited thereto. In one embodiment, the fixing agent is calcium chloride or magnesium chloride. Note that if the fixing agent is directly added and mixed with the dye raw material without undergoing purification in step S102, the solubility of the dye raw material is significantly reduced to 5 grams per liter (g / L) or less, making it difficult to fix the dye raw material or resulting in uneven fixing and easy occurrence of dyeing spots.

[0020] In one embodiment, the dye raw material is C.I. (Colour Index) Acid Black 172, and has the following chemical formula:

Chemical formula

[0021] In one preferred embodiment, the fixing agent is 15 parts by weight of magnesium chloride, and the dye raw material is C.I. Acid Black 172.

[0022] In one preferred embodiment, the fixing agent is 15 parts by weight of calcium chloride, and the dye raw material is C.I. Acid Black 172.

[0023] In one embodiment, the dye raw material is C.I. Acid Blue 113, and has the following chemical formula:

Chemical formula

[0024] In one preferred embodiment, the fixing agent is 15 parts by weight of magnesium chloride, and the dye raw material is C.I. Acid Blue 113.

[0025] In one preferred embodiment, the dyeing agent is 15 parts by weight of calcium chloride, and the dye raw material is CI Acid Blue 113.

[0026] In this specification, CI Acid Blue 113 or CI Acid Black 172 are shown in the form of chemical formula structures, but it is well known to those skilled in the art that they may also be shown in a free state or in other forms.

[0027] The present invention further provides acid dyes produced using the methods for producing acid dyes of the above embodiments. In one embodiment, the acid dye may be used in a dyed product, and the dyed product is dyed with the above acid dye. The dyed product may contain polyamide fiber material, and the polyamide fiber material may include synthetic polyamide fibers and natural polyamide fibers. Examples of synthetic polyamide fibers include nylon, and examples of natural polyamide fibers include animal hair such as wool. Examples of processing forms for the polyamide fiber material include scattering, spinning, weaving, knitting, etc.

[0028] [Experimental Examples and Comparative Examples of Methods for Producing Acid Dyes]

[0029] Figures 2 and 3 are comparative images of experimental examples and comparative examples of methods for producing acid dyes according to one embodiment and another embodiment of the present invention.

[0030] The left side of Figure 2 shows an experimental example using the acid dye production method of the present invention. 100 parts by weight of CI Acid Black 172 was used as the dye raw material, and 15 parts by weight of calcium chloride was used as the dyeing agent. The remaining solution after dyeing at a dyeing concentration of 3.5% is shown. The right side of Figure 2 shows a comparative example using commercially available CI Acid Black 172 dye, and the remaining solution after dyeing under the same conditions is shown. As is clear from Figure 2, the dye concentration in the remaining solution after dyeing in the experimental example was significantly reduced compared to the remaining solution in the comparative example. Furthermore, when measured by high-performance liquid chromatography (HPLC), the heavy metal chromium content in the remaining solution of the experimental example was 0.88 ppm, while the heavy metal chromium content in the remaining solution of the comparative example was 1.95 ppm. In other words, the acid dye production method of the present invention can effectively reduce the heavy metal chromium content in the remaining dye solution to 45% of that of currently commercially available dyes.

[0031] The left side of Figure 3 shows an experimental example using the acid dye production method of the present invention, where 100 parts by weight of CI Acid Black 172 was used as the dye raw material, 15 parts by weight of calcium chloride was used as the dyeing agent, and the remaining solution after dyeing at a dyeing concentration of 6.0% was shown. The right side of Figure 3 shows a comparative example using commercially available CI Acid Black 172 dye, and the remaining solution after dyeing under the same conditions was shown. As is clear from Figure 3, the dye concentration in the remaining solution after dyeing in the experimental example was significantly reduced compared to the dyeing remaining solution of the comparative example. Furthermore, when measured by high-performance liquid chromatography, the heavy metal chromium content in the dyeing remaining solution of the experimental example was 2.26 ppm, while the heavy metal chromium content in the dyeing remaining solution of the comparative example was 11.08 ppm. In other words, the acid dye production method of the present invention can effectively reduce the heavy metal chromium content in the dyeing remaining solution to 20% of that of currently commercially available dyes.

[0032] In other examples, experimental examples dyed using the method for producing the acid dye of the present invention use 100 parts by weight of CI Acid Blue 113 as the dye raw material and 15 parts by weight of calcium chloride as the dyeing agent, and can be dyed at a dyeing concentration of 3.5%. Compared to a comparative example dyed using only commercially available CI Acid Blue 113 dye under the same conditions, the dye concentration and residue of the residual dye solution in the experimental examples of the present invention can be significantly reduced compared to the residual dye solution of the comparative example after dyeing.

[0033] In the acid dye and its manufacturing method of the present invention, compared to the prior art, by removing a large amount of impurities and complex salts from the dye raw material in step S102, and then adding a high-purity dyeing agent in step S104, it is possible to maintain the acid dye produced by the manufacturing method of the acid dye of the present invention at a solubility of 30 g / L to 50 g / L. This allows for good colorfastness and dyeing rate while maintaining a constant solubility, and prevents the formation of soap scum due to the complex composition of salts, or, if soap scum does form, the single component makes it easily removable by chemical means.

[0034] Furthermore, the acid dyes and methods for producing the same of the present invention help reduce the concentration of dyeing residue and heavy metal residues, further reducing environmental hazards and industrial process costs, thereby achieving the objectives of energy conservation, reduction of carbon dioxide emissions, and environmental sustainability.

[0035] The present invention is disclosed in several preferred embodiments, which are not intended to limit the invention but are intended to enable a person of ordinary skill to clearly understand the embodiments described herein. A person skilled in the art can make various modifications, substitutions and alterations without departing from the spirit and scope of the invention, so the scope of protection of the present invention is deemed to be defined by the appended claims. [Explanation of Symbols]

[0036] S101, S102, S103, S104: Step

Claims

1. The steps include providing dye raw materials and The steps include: adding water to the dye raw material to form a dye raw material solution, and purifying the dye raw material solution by adding water to reduce the amount of salts in the dye raw material solution to a range greater than 5% by weight and less than 15% by weight; A step of drying the purified dye raw material solution in order to form a refined dye, A method for producing an acid dye, comprising the step of adding 3 to 20 parts by weight of a dyeing agent to 100 parts by weight of the dried purified dye and mixing thoroughly.

2. A method for producing an acid dye according to claim 1, wherein the dyeing 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 dyeing agent to the dried purified dye and mixing thoroughly, the dyeing 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 dyeing agent to the dried purified dye and mixing thoroughly, the dyeing agent is 15 parts by weight of magnesium chloride.

5. The dye raw material is C.I. (Color Index) Acid Black 172, and its chemical formula is as follows: 【Chemistry 1】 A method for producing an acid dye according to claim 1, having the following characteristics:

6. The method for producing an acid dye according to claim 5, wherein in the step of adding the dyeing agent to the dried purified dye and mixing thoroughly, the dyeing 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 dyeing agent to the dried purified dye and mixing thoroughly, the dyeing agent is 15 parts by weight of magnesium chloride.

8. The dye raw material is C.I. Acid Blue 113, and its chemical formula is as follows: 【Chemistry 2】 A method for producing an acid dye according to claim 1, having the following characteristics:

9. The method for producing an acid dye according to claim 8, wherein in the step of adding the dyeing agent to the dried purified dye and mixing thoroughly, the dyeing 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 dyeing agent to the dried purified dye and mixing thoroughly, the dyeing agent is 15 parts by weight of magnesium chloride.

11. An acid dye produced using the method for producing an acid dye described in any one of claims 1 to 10.

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