CN116446200B - A method for indigo dyeing of cotton fabric based on direct electrochemical reduction - Google Patents
A method for indigo dyeing of cotton fabric based on direct electrochemical reduction Download PDFInfo
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- CN116446200B CN116446200B CN202310243454.0A CN202310243454A CN116446200B CN 116446200 B CN116446200 B CN 116446200B CN 202310243454 A CN202310243454 A CN 202310243454A CN 116446200 B CN116446200 B CN 116446200B
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/58—Material containing hydroxyl groups
- D06P3/60—Natural or regenerated cellulose
- D06P3/6025—Natural or regenerated cellulose using vat or sulfur dyes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/22—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using vat dyestuffs including indigo
- D06P1/228—Indigo
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/20—Physical treatments affecting dyeing, e.g. ultrasonic or electric
- D06P5/2016—Application of electric energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
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Abstract
The invention provides a cotton fabric indigo dyeing method based on direct electrochemical reduction, which comprises the steps of S1, adopting a flowing plate-frame electrolysis device to directly and electrochemically reduce indigo dye, S2, sending the reduced dye to a dyeing device to dye cotton fabric, S3, sending dyed dye liquor to the flowing plate-frame electrolysis device, and repeating the steps S1-S2 for a plurality of times. The invention makes the indigo directly contact with the electrode to obtain electrons through the flowing plate-frame electrolysis device, thereby reducing the indigo, being a direct electrochemical reduction process, not introducing any metal ions, having no pollution to reaction products, being clean and environment-friendly, having good application prospect, being superior to the traditional process in energy consumption, cost and the like, and having better dyeing effect than the traditional dyeing, being capable of recycling dye liquor for multiple times and having little fluctuation of K/S apparent color depth.
Description
Technical Field
The invention relates to a dyeing method of cotton fabric, in particular to an indigo dyeing method of cotton fabric based on direct electrochemical reduction.
Background
Indigo dye is generally used for dyeing in denim dyeing technology, but indigo is insoluble in water, has no affinity to cotton fabrics, and can be reduced into leuco bodies by a reducing agent under alkaline conditions. Sodium dithionite (commonly known as sodium hydrosulfite) is used as a reducing agent in the traditional dyeing process to reduce indigo to leuco bodies for dyeing. However, the strongpoint is not renewable and generates sulfur-containing compounds after decomposition, causing environmental pollution.
In recent years, indirect electrochemical reduction of indigo has high heat, and the system uses an iron ion complex as a bridge to obtain electrons from a cathode and then transfer the electrons to a dye for reduction. However, the technology introduces metal ions such as iron ions, which not only has a certain influence on fabrics, but also causes a certain degree of pollution to the environment. It is therefore necessary to devise a method for direct electrochemical reduction of indigo without introducing any metal ions, to overcome the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a cotton fabric indigo dyeing method based on direct electrochemical reduction, aiming at the problems of high pollution, high energy consumption and high emission of the traditional process and a large amount of metal ions introduced by the traditional indirect electrochemical reduction method.
The invention is realized in the following way:
the invention provides a cotton fabric indigo dyeing method based on direct electrochemical reduction, which comprises the following steps:
s1, directly performing electrochemical reduction on indigo dye by adopting a flow plate-frame electrolysis device;
S2, delivering the reduced dye to a dyeing device to dye the cotton fabric;
s3, conveying the dyed dye liquor to a flowing plate frame electrolysis device, and repeating the steps S1-S2 for a plurality of times.
The invention makes the indigo directly contact with the electrode to obtain electrons through the flowing plate-frame electrolysis device, thereby reducing the indigo, being a direct electrochemical reduction process, not introducing any metal ions, having no pollution to reaction products, being clean and environment-friendly, having good application prospect, being superior to the traditional process in energy consumption, cost and the like, and having better dyeing effect than the traditional dyeing, being capable of recycling dye liquor for multiple times and having little fluctuation of K/S apparent color depth.
Further, the flowing plate-frame electrolytic device comprises a plate-frame electrolytic tank, a cathode liquid storage tank and an anode liquid storage tank, wherein the cathode liquid storage tank and the anode liquid storage tank are respectively provided with a feed inlet, a discharge outlet and an air outlet, the cathode liquid storage tank and the anode liquid storage tank respectively send catholyte and anolyte to a cathode and an anode of the plate-frame electrolytic tank through the discharge outlet, and the cathode liquid storage tank is also provided with a discharge hole for sending the reduced dye to a dyeing device.
Further, the air outlet holes of the cathode liquid storage tank and the anode liquid storage tank are connected with cold hydrazine to prevent the pressure in the tanks from being too high.
Further, a water stop valve is connected to a discharge hole of the cathode liquid storage tank, and after the indigo is completely reduced, the water stop valve is opened to send the reduced dye to a dyeing device.
Further, the catholyte is an indigo and an alkaline solution, the ratio of the indigo to the alkaline solution is 2:1, and the anolyte is an alkaline solution.
Further, in step S1, the indigo dye is completely reduced under the conditions of the voltage of 10-15V, the temperature of 40-60 ℃, the liquid inlet flow rate of 10-20 ml/min and the ultrasonic treatment of 1-2 hours.
Further, dyeing apparatus includes infiltration pond, dye vat and the washing pond that sets up side by side in proper order, is provided with interconnect's running roller on infiltration pond, dye vat and the washing pond.
Further, in the step S2, the cotton fabric is respectively permeated by a permeation tank, colored by a dye vat, washed off by a water washing tank to remove floating color, and finally oxidized and air-dried to finish dyeing of the cotton fabric.
Further, the cotton fabric is yarn or twill cotton.
The invention has the following beneficial effects:
1. The invention has no pollution to reaction products, is clean and environment-friendly, is far superior to the existing sodium hydrosulfite system and indirect electrochemical reduction system from the technical perspective, has better wear resistance, stretch breaking, strength breaking and K/S apparent color depth after dyeing, and is superior to the traditional technology in the aspects of energy consumption, cost and the like.
2. The dye liquor produced in the invention can be recycled, and the apparent color depth fluctuation of K/S is small after the cyclic dyeing.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an apparatus used in the production of an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of a functional plate in a plate-and-frame electrolytic cell according to an embodiment of the present invention;
FIG. 3 is a graph showing the comparison of K/S curves of multiple yarn dye-ups and multiple yarn dye-ups of a conventional yarn in an embodiment of the present invention;
FIG. 4 is a graph showing the comparison of K/S curves for multiple dyeing of denim over three and one under three in the examples of the present invention and multiple dyeing of denim over three and one under three in the conventional examples;
FIG. 5 is a graph showing the K/S pattern of multiple electrolysis one dye-uptake of a yarn according to example 5 of the present invention;
FIG. 6 is a graph showing the repeated electrotinning of denim over three and under one in example 6 of the present invention.
The device comprises a plate-frame electrolytic tank 1, a cathode liquid storage tank 3, an anode liquid storage tank 4, a peristaltic pump 5, cold hydrazine, a cathode 6, an anode 7, a cathode 8, a water stop valve 9, a permeation tank 10, a dye vat 11, a water washing tank 12-function plates 13-pipelines 14-grooves.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the apparatus used in the embodiment of the present invention includes a flow plate and frame electrolyzer comprising a plate and frame electrolyzer 1, a cathode liquid reservoir 2 and an anode liquid reservoir 3, and a dyeing apparatus.
The cathode liquid storage tank 2 and the anode liquid storage tank 3 are respectively provided with a feed inlet, a discharge outlet and an air outlet, the air outlet is connected with a cold hydrazine 5, the cathode liquid storage tank 2 and the anode liquid storage tank 3 respectively send cathode liquid and anode liquid to a cathode 7 and an anode 6 of the plate frame electrolytic tank 1 through the discharge outlet, the cathode 7 and the anode 6 are arranged on two sides of the plate frame electrolytic tank 1 and are connected with a direct current power supply, the cathode liquid is indigo and alkaline solution, the anode liquid is alkaline solution, the cathode liquid and the anode liquid respectively return to the cathode liquid storage tank 2 and the anode liquid storage tank 3 from the feed inlet after electrolysis, the indigo is directly contacted with an electrode to obtain electrons, reduction is completed, the cathode liquid storage tank 2 is further provided with a discharge hole, a water stop valve 8 is connected to the discharge hole to prevent backflow, and the reduced indigo is sent to a dyeing device from the discharge hole.
The dyeing device comprises a permeation tank 9, a dye vat 10 and a water washing tank 11 which are sequentially arranged side by side, rollers which are connected with each other are arranged on the permeation tank 9, the dye vat 10 and the water washing tank 11, cotton fabrics are respectively permeated through the permeation tank 9, the dye vat 10 is colored, the water washing tank 11 is washed off with floating color, and finally, the dyeing of the cotton fabrics is completed by oxidizing air drying.
The dyed dye liquor can be recycled, and the dyed dye liquor is pumped to a cathode tank for repeated electrolysis by turning the direction of a peristaltic pump 4.
As shown in fig. 2, the core component of the plate-frame electrolytic tank 1 is a functional plate 12 (divided into a cathode functional plate and an anode functional plate), the functional plate 12 is provided with a pipeline 13 for allowing catholyte or anolyte to enter and exit, the middle of the functional plate is provided with a groove 14, the groove 14 and other components are matched to form a cathode chamber or an anode chamber, RVC porous glassy carbon and the like can be filled in the cathode chamber according to specific reaction conditions to form a three-dimensional electrode system, the contact area of dye and an electrode is further increased, and the reduction effect is enhanced.
Accordingly, the direct electrochemical reduction-based indigo dyeing method for cotton fabrics of the present invention comprises the steps of:
s1, directly performing electrochemical reduction on indigo dye by adopting a flow plate-frame electrolysis device;
S2, delivering the reduced dye to a dyeing device to dye the cotton fabric;
s3, conveying the dyed dye liquor to a flowing plate frame electrolysis device, and repeating the steps S1-S2 for a plurality of times.
Example 1
A catholyte solution (indigo: sodium hydroxide=2:1) with an indigo concentration of 80-120 g/L and an anolyte solution with a sodium hydroxide concentration of 20-40 g/L were prepared.
The indigo is completely reduced in a flowing plate-frame electrolytic device under the optimal process conditions of 10-15V voltage, 40-60 ℃ temperature, 10-20 ml/min liquid inlet flow rate and 1-2 h ultrasonic treatment. Then, 30cm of yarn was dyed, oxidized, air-dried, and its K/S value was measured.
Comparative example 1
Dye liquor with the indigo concentration of 80-120 g/L (indigo: sodium hydroxide=2:1) is prepared, and sodium hydrosulfite with the same concentration is added for reduction. After complete reduction, 30cm of yarn was then taken, dyed, oxidized, air dried and its K/S value measured.
Example 2
A catholyte solution (indigo: sodium hydroxide=2:1) with an indigo concentration of 80-120 g/L and an anolyte solution with a sodium hydroxide concentration of 20-40 g/L were prepared.
The indigo is completely reduced in a flowing plate-frame electrolytic device under the optimal process conditions of 10-15V voltage, 40-60 ℃ temperature, 10-20 ml/min liquid inlet flow rate and 1-2 h ultrasonic treatment. Then, 30cm yarn was dyed, oxidized, air-dried, and the K/S value was measured repeatedly.
Comparative example 2
Dye liquor with the indigo concentration of 80-120 g/L (indigo: sodium hydroxide=2:1) is prepared, and sodium hydrosulfite with the same concentration is added for reduction. After complete reduction, 30cm of yarn was then dyed, oxidized, air dried, repeated several times, and its K/S value measured.
Example 3
A catholyte solution (indigo: sodium hydroxide=2:1) with an indigo concentration of 80-120 g/L and an anolyte solution with a sodium hydroxide concentration of 20-40 g/L were prepared.
The indigo is completely reduced in a flowing plate-frame electrolytic device under the optimal process conditions of 10-15V voltage, 40-60 ℃ temperature, 10-20 ml/min liquid inlet flow rate and 1-2 h ultrasonic treatment. Then, 5cm x 5cm of denim was taken, dyed, oxidized and air-dried, and the K/S value was measured.
Comparative example 3
Dye liquor with the indigo concentration of 80-120 g/L (indigo: sodium hydroxide=2:1) is prepared, and sodium hydrosulfite with the same concentration is added for reduction. After complete reduction, 5cm x 5cm of denim was taken, dyed, oxidized and air dried, and the K/S value was measured.
Example 4
A catholyte solution (indigo: sodium hydroxide=2:1) with an indigo concentration of 80-120 g/L and an anolyte solution with a sodium hydroxide concentration of 20-40 g/L were prepared.
The indigo is completely reduced in a flowing plate-frame electrolytic device under the optimal process conditions of 10-15V voltage, 40-60 ℃ temperature, 10-20 ml/min liquid inlet flow rate and 1-2 h ultrasonic treatment. Then, 5cm x 5cm of denim is taken, dyed, oxidized and air-dried, repeated for a plurality of times, and the K/S value is measured.
Comparative example 4
Dye liquor with the indigo concentration of 80-120 g/L (indigo: sodium hydroxide=2:1) is prepared, and sodium hydrosulfite with the same concentration is added for reduction. After complete reduction, 5cm x 5cm of denim was taken, dyed, oxidized, air dried, repeated several times and its K/S value was measured.
Example 5
A catholyte solution (indigo: sodium hydroxide=2:1) with an indigo concentration of 80-120 g/L and an anolyte solution with a sodium hydroxide concentration of 20-40 g/L were prepared.
The indigo is completely reduced in a flowing plate-frame electrolytic device under the optimal process conditions of 10-15V voltage, 40-60 ℃ temperature, 10-20 ml/min liquid inlet flow rate and 1-2h ultrasonic treatment. Then, a 30cm pure cotton yarn is taken, dyed, oxidized and air-dried, and the K/S value is measured.
The dye liquor was electrolyzed repeatedly every other day, then the pure cotton yarn of 30cm yarn was taken, dyed, oxidized, air-dried, and the K/S value was measured, and the result is shown in FIG. 5.
Example 6
A catholyte solution (indigo: sodium hydroxide=2:1) with an indigo concentration of 80-120 g/L and an anolyte solution with a sodium hydroxide concentration of 20-40 g/L were prepared.
The indigo is completely reduced in a flowing plate-frame electrolytic device under the optimal process conditions of 10-15V voltage, 40-60 ℃ temperature, 10-20 ml/min liquid inlet flow rate and 1-2 h ultrasonic treatment. Then, 5cm x 5cm of denim was taken, dyed, oxidized and air-dried, and the K/S value was measured.
The dye liquor was electrolyzed repeatedly every other day, 5cm of three-upper and lower denim was taken, dyed, oxidized and air-dried, and the K/S value was measured, and the result is shown in FIG. 6.
According to examples 1-4 and comparative examples 1-4, yarns and denim were dyed one or more times, respectively, the data obtained are shown in Table 1, and the K/S curves are shown in FIG. 3 and FIG. 4:
TABLE 1K/S values for fabrics dyed by conventional and direct electrochemical methods one or more times
It can be seen that the effect of the method is superior to that of the traditional dyeing by directly contacting the indigo with the electrode to obtain electrons through the flowing plate-frame electrolysis device and directly dyeing yarn and twill after electrochemical reduction.
The invention does not introduce metal ions, the reaction product is pollution-free, clean and environment-friendly, the technology is far superior to the existing sodium hydrosulfite system and indirect electrochemical reduction system in terms of technology, and the yarn dyed by the technology has better wear resistance, stretching and strength breaking and K/S apparent color depth, and is superior to the traditional technology in terms of energy consumption, cost and the like.
Meanwhile, as can be seen from fig. 5 and 6, the dye liquor produced in the invention can be recycled, and the apparent color depth fluctuation of K/S is small after cyclic dyeing.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433770A (en) * | 2011-08-31 | 2012-05-02 | 常州耀春格瑞纺织品有限公司 | Electrochemical quick cleaning dyeing process for vat dye |
| CN113166954A (en) * | 2018-11-30 | 2021-07-23 | 赛杜工程股份有限公司 | Electrochemical reactor and cleaning or regenerating thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6627063B1 (en) * | 1998-11-24 | 2003-09-30 | Walter Marte | Method and apparatus for reducing vat and sulfur dyes |
| HK1067926A2 (en) * | 2004-01-20 | 2005-03-24 | Hong Kong Productivity Council | An electrochemical dye reducing method. |
| WO2009051569A2 (en) * | 2007-10-18 | 2009-04-23 | Univerza V Mariboru Fakulteta Za Strojnistvo | Process of dyeing cellulose and polyamide textile materials with enzyme reduced indigo |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433770A (en) * | 2011-08-31 | 2012-05-02 | 常州耀春格瑞纺织品有限公司 | Electrochemical quick cleaning dyeing process for vat dye |
| CN113166954A (en) * | 2018-11-30 | 2021-07-23 | 赛杜工程股份有限公司 | Electrochemical reactor and cleaning or regenerating thereof |
Non-Patent Citations (1)
| Title |
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| 靛蓝染料的电化学还原及其在牛仔产业的应用;万振;中国硕士学位论文全文数据库;20240331;20-23 * |
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