TWI692564B - Water washing process for reducing dyeing and finishing water - Google Patents

Abstract

A water-washing process that reduces dyeing and finishing water, especially a decolorizing additive with a reducing effect, and provides an acidic, alkaline or neutral reaction environment according to the reaction conditions of the additive to remove residual dyes in the dyeing process and reduce The number of washing times required for the process. The washing process is to reduce the water temperature of the dyeing tank after dyeing to 80℃～90℃, add the decolorizing additives to the dyeing tank to mix, and keep it for about 5~20 minutes, decide whether to adjust the pH value according to the subsequent processing requirements, and then wash Approximately 1 to 3 times, that is, complete the dyeing and finishing operation, by directly adding a decolorizing additive to destroy the unfixed dye on the fiber and remove the color of the residual dyeing liquid, that is, to save 1 to 3 washing steps.

Description

Water washing process for reducing dyeing and finishing water

The invention relates to a water washing process for reducing dyeing and finishing water, in particular to a decolorizing additive with reducing properties, and according to the reaction conditions of the decolorizing additive, an acidic, alkaline or neutral decolorizing reaction environment is provided to remove dyeing The residual dyes in the process and the unfixed dyes on the fiber reduce the number of washing times required in the process.

Dyeing and finishing technology adds a lot of changes and fun in life. Whether it is clothes or shoes worn on the body, or all kinds of non-cortical products such as fabrics and fibers in life, you can apply dyeing and finishing technology to present a variety of visual effects To create higher value;

In the process of dyeing and finishing, it is necessary to use dyes (dyes and chemicals) to dye various types of fibers, and then wash with a large amount of water to remove residual dyes. In the conventional dyeing and finishing washing process, cooperate with Figure 1 The schematic diagram of the conventional dyeing and finishing washing steps shown in the figure shows that the conventional dyeing and finishing washing steps include: Step A101: reduce the water temperature of the dyeing tank completed with dyeing to 50°C to 90°C; Step A102: perform water washing 1 to 3 times; Step A103: After completion, fill the dyeing tank with water and heat up to 80 ℃ ~ 90 ℃, and then adjust the pH value of the cleaning process according to the type of cleaning agent in the next step; Step A104: Add cleaning agent to wash, At the same time, keep it warm for 20 minutes and then slowly lower the temperature to 40°C~60°C to drain; Step A105: Add acid or alkali to adjust the pH value while washing. Wash it 1 to 3 times to complete the dyeing and finishing operation;

Among them, in the pH adjustment of steps A103 and A105, it is necessary to determine whether it is necessary to add alkali or acid according to the type of cleaning agent added in step A104;

In the above-mentioned conventional dyeing and finishing washing operation, in order to reduce the dyeing and finishing chemicals and dye residues on the fiber, a large amount of water resources are used to carry out repeated washing operations;

Due to the large amount of water used in the dyeing and finishing process, it causes waste of water resources. If the wastewater is to be reused repeatedly, it needs to pass another treatment process to increase the cost of manpower and material resources;

For this reason, the applicant saw the aforementioned deficiencies, and after repeated test results, it was obtained that before the conventional dyeing and finishing washing step, adding a decolorizing additive can reduce the washing step by 1 to 3 times to save water consumption and improve Operation timeliness, reduce labor and material costs.

The purpose of the present invention is to propose a water washing process that reduces the water used for dyeing and finishing. The water washing process includes a reducing decolorizing additive, and provides acidic, alkaline or neutral reaction conditions according to the reaction conditions of the decolorizing additive. The decolorizing additive can destroy the remaining dye color, thereby reducing the washing process.

The invention proposes a water washing process for reducing the water used for dyeing and finishing. The water washing process is to reduce the water temperature of the dyeing tank after dyeing to 80 ℃ ~ 90 ℃, add decoloring additives to the dyeing tank to mix, and keep the temperature for about 5 to 20 minutes. Then decide whether to adjust the pH value according to the subsequent processing requirements, and then wash it for about 1 to 3 times to complete the dyeing and finishing operation. By directly adding the decolorizing additives for decoloring and washing, that is, eliminating 1 to 3 water washing steps.

The invention proposes a water washing process for reducing water for dyeing and finishing. The decolorizing additives may be low sodium sulfite and thiourea dioxide, which need to be carried out under alkaline conditions with a pH value of about pH 10.5 to pH 12.0.

The invention proposes a water washing process for reducing the water used for dyeing and finishing. The sodium sulfite of the color-removing additive is 1% to 3% of the weight of the fiber in the dyeing tank when it is implemented.

The invention proposes a water washing process for reducing the water used for dyeing and finishing. The thiourea dioxide of the decolorizing additive is added at a rate of 1% to 3% of the weight of the fiber in the dyeing tank.

The invention proposes a water washing process for reducing the water used for dyeing and finishing. The decolorizing additive may be sodium formaldehyde sulfoxylate. The percentage of addition is 1% to 3% of the weight of the fiber in the dyeing tank. The pH value needs to be about pH 4.0~ Carry out under acidic conditions of pH 5.0.

As shown in Figures 2 and 3, it is the description of the decolorization washing process and decolorization additives of the invention that can reduce the amount of water. First, as shown in Figure 3, the invention of the present invention is to achieve the goal of reducing water consumption. Add the decolorizing additive 10 to the decolorizing and washing, so that the overall water washing process can reduce the water. The decolorizing additive 10 is divided into the additive 100 used under alkaline conditions and the additive used under acidic conditions. 101, and the additive 100 used under alkaline conditions can be sodium hyposulfite or thiourea dioxide, and the additive 101 used under acidic conditions can be sodium formaldehyde secondary acid, wherein the additive 100 used under alkaline conditions is in the dyeing tank The addition ratio is 1% to 3% of the weight of the fiber in the dyeing tank. The pH value needs to be maintained at pH10.5~pH12.0. The addition ratio of the additive 101 used in acidic conditions in the dyeing tank is the weight of the fiber in the dyeing tank. 1%～3%, the pH value needs to be maintained at pH4.0~pH5.0;

As shown in Figures 2 and 3, since the decolorization additive 10 described above can provide a reduction in water used in the dyeing and finishing process, this is a description of the dyeing and finishing decolorization cleaning process. The dyeing and finishing decolorization process includes: Step S101: Reduce the water temperature of the dyeing tank to 80℃～90℃; Step S102: Add the decolorizing additives to the dyeing tank to mix, and keep the temperature for about 5~20 minutes; Step S103: Decide whether to adjust the pH value according to the subsequent processing requirements And wash it for about 1 to 3 times to complete the dyeing and finishing operation;

It can be known from the foregoing steps that the decolorizing additive 10 is added after the dyeing is completed. After the decoloring operation, the agent is washed by water washing, and the washing operation is greatly reduced by more than 2 times in the washing process, which has changed Knowing the washing process, providing a faster and more water-saving washing process;

As shown in Figure 2, Figure 3 and Figure 4, in the process of the present invention, after adding the decolorizing additive 10, the effect of removing the residual liquid of the dye can be achieved, and the number of washing operations can be saved, thereby reducing the amount of water used. ;

However, under the process of the present invention, if there are special needs to add other chemicals, the dyeing and finishing operation can also be added to this operation process (as shown in Figure 4). The operation steps are described as follows: Step G101: will be completed The water temperature of the dyeing tank is reduced to 80°C to 90°C; Step G102: Add the decolorizing additives to the dyeing tank to mix and keep for about 5 minutes; Step G103: Perform overflow water washing or directly drain the residual liquid; Step G104: Re-enter the water and Add special requirements of chemicals; Step G105: Adjust the pH value and wash it for about 1 to 3 times to complete the dyeing and finishing operation. Here we provide a step-by-step application of using other reagents if there are special needs. This process also significantly reduces more than 2 times The number of washing operations;

In summary, the invention of the present invention provides a simplified decolorization and washing process after dyeing and finishing, mainly adding a decolorization additive 10, which can decolorize the residual dyeing liquid, and greatly reduce the number of washings, thereby saving water consumption and improving operation time. And reduce costs.

In addition to the use of 10 under acidic conditions using 101 of 100 under basic conditions color additive additive additive A101 ~ A105 conventional dyeing processes add washing step dyeing process water washing steps S101 ~ S103 to the present invention of the present invention G101 ~ G105 Washing steps of dyeing and finishing process of other agents

FIG. 1 is a schematic diagram of the steps of the conventional dyeing and finishing washing process. FIG. 2 is a schematic diagram of steps of a water washing process for reducing dyeing and finishing water according to the present invention. FIG. 3 is a schematic diagram of a decolorizing additive for reducing the washing process of dyeing and finishing water according to the present invention. FIG. 4 is a schematic diagram of adding other chemicals according to the water washing process of the reduced dyeing and finishing water of the present invention with special requirements.

S101~S103 Washing steps of the dyeing and finishing process of the present invention

Claims (4)

A water washing process that reduces the water used for dyeing and finishing. The steps include: Step A: Reduce the temperature of the dyeing tank to 80℃~90℃; Step B: Add the decolorizing additive to the dyeing tank to mix, and keep it warm for about 5~20 minutes ; Step C: After washing for about 1 to 3 times, the dyeing and finishing operation is completed; wherein, the decolorizing additive in step B may be an acidic, alkaline or neutral decolorizing additive, the decolorizing additive is alkaline The additives used under the conditions should be implemented at a pH of about pH10.5~pH12.0, and the percentage of addition is 1%~3%; the additives used under acidic conditions should be at a pH of about pH4 .0 ~ pH5.0 implementation, the percentage of addition is 1% ~ 3%. As described in the first paragraph of the scope of the patent application, the water washing process for reducing the dyeing and finishing water is used. The additive used in the alkaline condition of the decolorizing additive may be sodium hyposulfite or thiourea dioxide. According to the water washing process for reducing the dyeing and finishing water described in item 1 of the scope of the patent application, the additive used in the acidic condition of the decolorizing additive may be sodium formaldehyde sulfoxylate. A water washing process that reduces the water used for dyeing and finishing. There are special requirements for using other chemicals. The steps include: Step A: Reduce the temperature of the dyeing tank to 80℃~90℃; Step B: Add the decolorizing additives to the dyeing tank to mix. Incubate for about 5 minutes and provide acid, alkaline or neutral decolorizing additives according to the reaction conditions of the water washing process. The additives used under alkaline conditions can be low sodium sulfite or thiourea dioxide. When the pH value is about pH10.5~pH12.0, the addition percentage is 1%~3%. The additive used under acidic conditions can be sodium formaldehyde sulfoxylate, which needs to be about pH4 .0~pH5.0 implementation, the addition percentage is 1%~3%; Step C: Wash with overflow water or directly discharge the residual liquid; Step D: Re-enter the water and add special requirements to wash it; Step E: Wash it about 1 to 3 times to complete the dyeing and finishing operation.

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