TWI808033B - Auxiliary for dyeing, its manufacturing method and applied dyeing process - Google Patents

Abstract

The present invention provides an auxiliary agent for dyeing, its manufacturing method and the applied dyeing process. By synthetically grafting the natural materials sodium alginate and stearic acid into a sodium alginate derivative surfactant, the coagulation property of the auxiliary agent is used to capture the dye in the dyeing and finishing wastewater and bring it into the cellulose fabric, so as to increase the dyeing rate of the cloth during the dyeing process and reduce the dye residue rate in the subsequent wastewater.

Description

Auxiliary for dyeing, its manufacturing method and applied dyeing process

The present invention belongs to the field of dyeing auxiliaries, and in particular relates to a dyeing auxiliaries capable of improving the dyeing rate during dyeing and reducing the dye residue rate in subsequent wastewater, its manufacturing method and the applied dyeing process.

By the way, in the textile industry, the dyeing and finishing process is a very important part, which will determine the performance of the finished product. With the progress of the times, the treatment technology and construction methods have been advancing day by day, but the treatment of high-chroma wastewater after dyeing and finishing is still the most difficult problem in today's generation that advocates environmental protection. The main pollutants in these dyeing and finishing wastewater are organic compounds of dyes. The discharge of these substances into rivers is likely to cause a huge ecological impact. For the dyeing and finishing industry, in order to meet economic benefits, most of the treatment methods for dyeing and finishing wastewater are combined with biological treatment and chemical coagulation. At present, there are about 10,000 different dyes used in industrial production level, and there are 7x10 ⁵ kinds of additives, which are produced all over the world. However, even if the existing auxiliaries on the market are used to help the dyeing and finishing process, about 20-25% of the dye compounds cannot be attached to the fabric during the dyeing and finishing process and are discharged with the wastewater. Therefore, more effective auxiliaries need to be used in the manufacturing process to reduce the environmental damage caused by the dyeing and finishing wastewater.

In view of this, the present inventor feels that it is not perfect and exhausts his mind and painstaking research, and based on his accumulated experience in this industry for many years, he then provides a kind of dyeing auxiliary agent and its manufacturing method and the dyeing process used, in order to improve the lack of the above-mentioned conventional technology.

Therefore, one object of the present invention is to provide a dyeing auxiliary agent, its manufacturing method and the applied dyeing process, so as to increase the dyeing rate of the cloth and reduce the dye residue rate in the subsequent wastewater generated during the dyeing process.

In order to achieve the above-mentioned purpose, the auxiliary agent for dyeing of the present invention is used to improve the color uptake rate during dyeing and reduce the residual dye rate of the wastewater produced in the follow-up. It is characterized in that: the general formula of the auxiliary agent for dyeing is: , and the n series is 10000-15000.

Moreover, the present invention also provides a method for preparing dyeing auxiliaries, which includes the following steps: (A) adding sodium alginate into water to dissolve, and stirring to a uniform state; (B) mixing the uniformly stirred sodium alginate and epichlorohydrin, and stirring at a constant temperature of 70°C for 1 to 2 hours; (C) In addition, mixing stearic acid with water, and stirring until completely dissolved; (D) After the stearic acid is completely dissolved, adding sodium bisulfite and stirring at a constant temperature for 2 hours at a temperature of 90°C; (E) The product of step B and the product of step D were subjected to a synthesis reaction at a temperature of 100° C. for 2 hours, and then water was removed to obtain a dyeing auxiliary. Wherein, the general formula of the auxiliary agent for dyeing is , and the n series is 10000-15000.

Preferably, the present invention further comprises the following steps: (F) dissolving the dyeing auxiliary in step E with ethanol, filtering, and then distilling under reduced pressure to remove the solvent, so as to obtain the dyeing auxiliary with high purity.

In addition, the present invention provides a dyeing process using dyeing auxiliaries to improve the color uptake, which includes the following steps: (1) adding dye and a dyeing auxiliary to a steel cylinder; (2) putting a fiber fabric into the steel cylinder and sealing it for dyeing; and (3) taking out the fiber fabric, washing it with water and soaping it, and then drying it naturally. Wherein, the general formula of the auxiliary agent for dyeing is , and the n series is 10000-15000.

Preferably, the fiber fabric is made of rayon.

In this way, the dyeing auxiliaries provided by the present invention can greatly reduce the content of dye compounds in the wastewater after dyeing, thereby reducing the pollution after the wastewater is discharged, and the above-mentioned dyeing process can also increase the dyeing rate of the fabric due to the addition of the dyeing auxiliaries, and also reduce the ratio of dye compounds in the wastewater generated after the process.

In order to enable your examiners to clearly understand the content of the present invention, the following descriptions are provided with accompanying drawings, please refer to them.

In this embodiment, a dyeing auxiliary agent provided by the present invention is produced through the following method: firstly, sodium alginate is dissolved in water and stirred to a uniform state. Next, mix well-stirred sodium alginate and epichlorohydrin, and keep stirring at a temperature of 70° C. for 1 to 2 hours. At this time, a first intermediate product will be reacted. In addition, stearic acid is mixed with water and stirred until completely dissolved, then sodium bisulfite is added and stirred at a constant temperature of 90° C. for 2 hours, and a second intermediate product will be produced by reaction at this time. Finally, the synthesis reaction of the first intermediate product and the second intermediate product was carried out at a temperature of 100° C. for 2 hours, and then the water was removed to obtain the auxiliary agent for dyeing. At this time, the chemical structure of the auxiliary agent for dyeing is , and the n series is 10000-15000. After the process is completed, follow-up treatment can also be carried out to purify the compound. Dissolve the raw materials of the unfinished reaction with ethanol and filter, then remove the solvent and excess water by vacuum distillation to obtain a compound with higher purity, and adjust it to different concentrations according to different dyeing conditions.

Figure 1 is a diagram for data analysis of the dyeing auxiliaries to confirm whether the dyeing auxiliaries have the characteristics of the auxiliaries. The X-axis is the concentration of the auxiliaries, and the Y-axis is the surface tension. When pure water is at 25°C, the surface tension is about 72.4dyne/cm. After adding the auxiliary agent, the surface tension will decrease with the increase of its concentration. It can be seen from the first figure that when the dyeing auxiliary agent is added, the surface tension will decrease significantly.

Figure 2 is a schematic diagram of the results obtained after an experiment aimed at whether too much foam will be produced after adding the dyeing auxiliaries. Excessive foam will hinder the contact between dyes and fabric fibers, resulting in uneven dyeing, and if the foam is difficult to eliminate, it will cause non-oxidation when discharged into rivers, which will cause a burden on the environment. It can be seen from Figure 2 that after adding the dyeing auxiliaries, the foaming property is low, the foam stability is good, and it meets the requirements of environmental protection, so it is a good auxiliaries that will not pollute the environment.

In the dyeing process, the ideal situation is to make the dyed fabric fully absorb the dye, which can not only make the finished product close to the original color of the dye, but also solve the problem of excessive color in the discharged wastewater, but it is often difficult to achieve it in actual on-site operations. Therefore, in this embodiment, the present invention provides a dyeing process using the above-mentioned dyeing auxiliary to increase the color uptake rate and reduce the dye residual rate in wastewater, comprising the following steps: (1) adding dye and a dyeing auxiliary into a steel cylinder; (2) putting a fiber fabric into the steel cylinder and sealing it for dyeing; and (3) taking out the fiber fabric and washing it with water and soaping, and then drying it naturally. In this embodiment, the dyed fabric is made of rayon.

Figures 3 to 5 are schematic diagrams of the results of detecting the dyeing rate of the fabric after adding different concentrations of the dyeing auxiliaries, different concentrations of dyes, and adjusting the dyeing holding time.

From Figure 3 to Figure 5, we can see that in terms of color uptake rate, when the dyeing auxiliaries reach 1% and then increase the concentration of the agent, the color uptake rate does not increase much, so if you want to get a better color uptake rate, the concentration of the dyeing auxiliaries is 1%. Too much chemical will only make it difficult to treat the wastewater after dyeing, and it will cause unnecessary pollution when it enters the river. In addition, the concentration of the dye must be increased to obtain a deep color on the fabric, so it is very important to know the maximum absorption value of the dye by the fabric. In the present invention, when the concentration of the dye reaches 1.5%, it reaches saturated dark color and no longer absorbs the dye. When the concentration of the dye is increased to 2%, the effect is almost the same as that of 1.5%. The excess dye will not only cause the difficulty of wastewater treatment but also cause waste of dye cost. Therefore, the dyeing auxiliary agent is added in the dye bath, and the dye concentration can be obtained without too high a dark color effect. Moreover, in the dyeing process, time control is related to the difference in coloring rate and dyeing uniformity, etc., and the dyeing holding time is an intangible cost spent in dyeing and finishing, which is a very important part of the output efficiency. From the figure, it can be seen that when the dyeing holding time reaches 40 minutes, the coloring rate does not increase significantly, and the coloring rate drops slightly at 60 minutes. There is a slight difference in the coloring rate at 80 minutes, 100 minutes and 40 minutes. It will not significantly increase the color uptake rate and will cause an increase in fabric cost and energy consumption.

Figure 6 is a schematic diagram of the results of detecting the dye residue rate in the wastewater after the dyeing process is completed for different concentrations of auxiliaries.

With the current dyeing technology in the dyeing and finishing industry, it is impossible to make fabrics absorb dyes 100% completely, but how to increase the exhaustion rate to reduce the cost and reduce the true color discharge of waste liquid is a big issue. From Figure 6, it can be seen that the concentration of the dyeing auxiliaries on the dyeing bath residual rate of rayon fabrics begins to decrease with the increase of the auxiliaries concentration, and after a period of fluctuations, it shows a moderate trend after 0.6%. Therefore, the auxiliaries provided by the present invention are very suitable as dyeing and finishing auxiliaries, which not only increase the dyeing rate but also reduce the residual dye.

In summary, the above experimental data show that adding the dyeing auxiliary agent provided by the present invention will increase the color uptake rate of rayon fabrics to direct dyes during dyeing. The water-soluble dyeing auxiliaries have low foaming properties, help the dyes to enter the fiber, increase the color uptake rate, and reduce the residue of dyes in the waste liquid. The best dyeing conditions are 1% auxiliaries concentration, 40°C dyeing temperature and 1.5% dye concentration. Adding the auxiliary agent for dyeing to the dyestuff can significantly improve the dyeing rate of the rayon fabric, and the coloring rate is also greatly improved. Therefore, the dyeing auxiliaries can indeed improve the dyeing rate of the cloth, and at the same time reduce the residual dye content in the wastewater produced afterwards, so as to avoid further pollution to the environment.

However, the above-mentioned ones are only preferred embodiments of the present invention, and are not used to limit the scope of implementation of this creation; therefore, equal changes and modifications made without departing from the spirit and scope of the present invention should be covered within the patent scope of the present invention.

Figure 1 is an experimental data diagram of whether the dyeing auxiliaries have the characteristics of the auxiliaries. Figure 2 is the experimental data of whether too much foam will be produced after dyeing auxiliaries. Fig. 3 is an experimental data diagram of the dyeing rate of rayon fabrics with dyeing auxiliaries at different concentrations. Fig. 4 is an experimental data diagram of the dyeing rate of rayon fabrics by dyeing auxiliaries at different dye concentrations. Fig. 5 is the experimental data diagram of the dyeing rate of the rayon fabric by dyeing auxiliaries under different dyeing and heat preservation times. Fig. 6 is an experimental data diagram of the dye residual rate in wastewater after the dyeing process is completed under different concentrations of auxiliaries.

Claims (6)

A kind of auxiliary agent for dyeing, which is used to improve the color uptake rate during dyeing, and reduce the dye residue rate in the subsequent waste water. It is characterized in that: the general formula of the auxiliary agent for dyeing is: Among them, the n series is 10000-15000. A method for preparing auxiliary agents for dyeing, comprising the following steps: (A) Dissolve sodium alginate in water and stir until uniform; (B) Mix well-stirred sodium alginate and epichlorohydrin, and stir at a constant temperature of 50°C for 1 to 2 hours; (C) Separately, stearic acid is mixed with water and stirred until completely dissolved; (D) After the stearic acid is completely dissolved, add sodium bisulfite and stir at a constant temperature of 90°C for 2 hours; and (E) The product of step B and the product of step D were subjected to a synthesis reaction at a temperature of 100° C. for 2 hours, and then water was removed to obtain a dyeing auxiliary. The method described in item 2 of the scope of the patent application, wherein the general formula of the auxiliary agent for dyeing is Among them, the n series is 10000-15000. The method described in item 3 of the scope of the patent application further includes the following steps: (F) Dissolving the dyeing auxiliary in step E with ethanol, filtering, and then distilling under reduced pressure to remove the solvent, so as to obtain the dyeing auxiliary with high purity. A dyeing process that utilizes dyeing auxiliaries to improve color uptake, comprising the following steps: (1) adding dye and a dyeing auxiliary to a steel cylinder; (2) putting a fiber fabric into a steel cylinder and sealing it before dyeing; and (3) taking out the fiber fabric and washing and soaping it, and then drying it naturally; wherein, the general formula of the dyeing auxiliary is Among them, the n series is 10000-15000. The dyeing process described in item 5 of the scope of the patent application, wherein the fiber fabric is made of rayon.

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