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A method for removing cationic ultrafine pigments from dyeing wastewater
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A technology of dyeing wastewater and cations, applied in the field of textile printing and dyeing, can solve problems such as difficult removal
Active Publication Date: 2021-09-10
QINGDAO UNIV
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Abstract
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Problems solved by technology
Since the average particle size of cationic ultrafine pigments is only a few hundred nanometers, the dispersion stability in water is high, and it is difficult to remove them sufficiently and efficiently by filtration, centrifugation, etc.
Method used
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Embodiment 1
[0013] (1) Dye the cotton fabric with cationic ultra-fine pigment red according to the conventional process. After dyeing, take the cotton fabric out of the dyeing solution, and keep the temperature of the dyeing residue at 50°C;
[0014] (2) Prepare a 5g / L chitosan quaternary ammonium salt solution for padding alginic acid non-woven fabrics, with a liquid retention rate of 100%, and dry at 60°C;
[0015] (3) Put the above-mentioned non-woven fabric into the superfine pigment red dyeing residue, the bath ratio is 100:1, take it out after stirring for 20 minutes, continue to stand at constant temperature for 1 hour, and then filter to remove the pigment particles.
[0016] After testing, after the treatment in Example 1, the average particle size of ultra-fine pigment red exceeds 250 microns, and the removal rate of pigment particles reaches 99.8% after filtering with commercially available fast filter paper. In addition, after the non-woven fabric treated with chitosan quatern...
Embodiment 2
[0021] (1) Dye the cotton fabric with cationic ultra-fine pigment blue according to the conventional process. After dyeing, take the cotton fabric out of the dyeing solution, and keep the temperature of the dyeing residue at 50°C;
[0022] (2) Prepare a 5g / L chitosan quaternary ammonium salt solution for padding alginic acid non-woven fabrics, with a liquid retention rate of 100%, and dry at 60°C;
[0023] (3) Put the above-mentioned non-woven fabric into the superfine pigment blue dyeing residue, the bath ratio is 100:1, take it out after stirring for 20 minutes, continue to stand at constant temperature for 1 hour, and then filter to remove the pigment particles.
[0024] After testing, after the treatment in Example 2, the average particle size of the ultrafine pigment blue exceeds 200 microns, and the removal rate of pigment particles reaches 99.7% after filtering with commercially available fast filter paper. In addition, after the non-woven fabric treated with chitosan q...
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Abstract
The invention relates to a method for removing cationic ultrafine pigments from dyeing wastewater, belonging to the technical field of textile printing and dyeing. The invention includes the following processes: (1) Dyeing the cotton fabric with cationic ultrafine pigments according to the conventional process, taking out the cotton fabric from the dyeing solution after dyeing, and keeping the temperature of the dyeing residue at 50°C; (2) preparing 5g / L chitosan quaternary ammonium salt solution padding alginic acid non-woven fabric, the liquid rate is 100%, and dried at 60 ° C; (3) put the above non-woven fabric into the superfine pigment dyeing residue, the bath ratio 100:1, take it out after stirring for 20 minutes, continue to stand at constant temperature for 1 hour, and then filter to remove the pigment particles. The invention provides a method for removing cationic ultra-fine pigments from dyeing wastewater, using alginic acid non-woven fabrics treated with chitosan quaternary ammonium salts to induce cationic ultra-fine pigments to quickly lose their stability and agglomerate from wastewater at a certain temperature Precipitate to achieve the purpose of effective removal, and the alginic acid non-woven fabric can be reused.
Description
technical field [0001] The invention relates to a method for removing cationic ultrafine pigments from dyeing wastewater, belonging to the technical field of textile printing and dyeing. Background technique [0002] Organic pigment dispersions can be used in the dyeing of various textiles. They have the advantages of short process flow, no need for washing, energy saving, easy color imitation, and high light fastness of dyed products. They are the key to energy saving, consumption reduction and emission reduction in the textile printing and dyeing industry. One of the techniques. The lack of water-soluble groups in the matrix structure of organic pigments has strong hydrophobicity, and it is difficult to disperse uniformly in aqueous media. Various types of dispersants are used for surface modification, and then it is formed by strong pulverization. Only fine particles can be used for dyeing of textiles. [0003] Cationic ultra-fine pigments do not require pretreatment of...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information
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