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A method for judging the salt-resistant and/or alkali-resistant stability of reactive dyes

A technology for the stability of reactive dyes, which is applied in the field of judging the salt-resistant and/or alkali-resistant stability of reactive dyes. Judging criteria are intuitive and precise, and the effect of judging accuracy and accuracy is high

Active Publication Date: 2020-07-28
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method evaluates the salt-resistant and / or alkali-resistant stability of reactive dyes by observing the residue on the filter paper and the shortest time for the dye liquor to precipitate solid dye on the filter paper to judge whether its salt-resistant and / or alkali-resistant stability is good or bad, mainly It is evaluated by human visual observation, and the dye solution will be destroyed when sampling, the operational error is large, and the evaluation standard is not accurate

Method used

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  • A method for judging the salt-resistant and/or alkali-resistant stability of reactive dyes
  • A method for judging the salt-resistant and/or alkali-resistant stability of reactive dyes
  • A method for judging the salt-resistant and/or alkali-resistant stability of reactive dyes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Sample preparation-installation; Weigh 2g of the purified reactive blue 19 dye, add 90ml of deionized water, stir fully, then add 10ml of 10g L to the dye solution -1 Sodium carbonate solution, after stirring evenly, immediately take 30ml of the prepared dye solution and slowly pour it into a clean and dry cylindrical glass sample cell, cover the cell cover, and put the prepared sample cell into the No. 1 position of the multiple light scattering instrument ;

[0031] (2) Spectrum scanning; set the indicators of the multiple light scattering instrument, set the temperature of the reactive dye dye solution sample test to 25°C, the measurement position is No. 1 warehouse, the scanning time is 5h, and the number of scanning times is 21 times. The multiple light scattering instrument scans the spectrum of the sample from the bottom to the top under the set conditions. During the scanning process, the transmittance at different heights of the dye sample is recorded in re...

Embodiment 2

[0034] (1) Sample preparation-installation; Weigh 1.75g ​​of the purified reactive blue 19 dye and 0.25g of reactive blue 49 dye, mix well, add 90ml of deionized water, stir well, then add 10ml of 10g L to the dye solution -1 Sodium carbonate solution, after stirring evenly, immediately take 30ml of the prepared dye solution and slowly pour it into a clean and dry cylindrical glass sample cell, cover the cell cover, and put the prepared sample cell into the No. 2 position of the multiple light scattering instrument ;

[0035] (2) Spectrum scanning; set the indicators of the multiple light scattering instrument, set the temperature of the reactive dye dye solution sample test to 25°C, the measurement position is No. 1 warehouse, the scanning time is 5h, and the number of scanning times is 21 times. The multiple light scattering instrument scans the spectrum of the sample from the bottom to the top under the set conditions. During the scanning process, the transmittance at diffe...

Embodiment 3

[0038] (1) Sample preparation-installation; Weigh 1.7g of the purified reactive blue 19 dye and 0.3g of reactive blue 49 dye, mix well, add 90ml of deionized water, stir well, then add 10ml of 10g L to the dye solution -1 Sodium carbonate solution, after stirring evenly, immediately take 30ml of the prepared dye solution and slowly pour it into a clean and dry cylindrical glass sample cell, cover the cell cover, and put the prepared sample cell into the No. 3 position of the multiple light scattering instrument ;

[0039] (2) Spectrum scanning; set the indicators of the multiple light scattering instrument, set the temperature of the reactive dye dye solution sample test to 25°C, the measurement position is No. 1 warehouse, the scanning time is 5h, and the number of scanning times is 21 times. The multiple light scattering instrument scans the spectrum of the sample from the bottom to the top under the set conditions. During the scanning process, the transmittance at different...

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Abstract

The invention relates to a method for judging salt and / or alkali resistance stability of a reactive dye. The method is characterized by adding salt and / or alkali to a reactive dye solution and uniformly mixing the solution; carrying out spectrum scanning for many times repeatedly on the dye solution in the height direction by utilizing multiple light scattering instruments, and obtaining a function curve graph each time; with the function curve graph obtained from the first scanning being served as a reference graph, comparing the transmittance of each function curve graph with the transmittance corresponding to the same dye solution height position in the reference graph according to the scanning sequence; regarding the difference value of the scanning starting time corresponding to the function curve graph and the reference graph for the point where the transmittance reduction rate is greater than or equal to 5% for the first time as precipitation time of the reactive dye; and when the precipitation time is larger than 2.5 h, judging that the reactive dye has good salt and / or alkali resistance stability, or otherwise, judging that the reactive dye has poor salt and / or alkali resistance stability. The method can be used to judge the salt and alkali resistance stability of various reactive dyes; and compared with a conventional evaluation method, the method has the characteristics of high efficiency and accuracy and does not cause damage to the dye solution.

Description

technical field [0001] The invention belongs to the technical field of evaluating salt-resistant and alkali-resistant stability quality indicators of dye liquors, and relates to a method for judging the salt-resistant and / or alkali-resistant stability of reactive dyes. Background technique [0002] As a representative of the modern dye industry, reactive dyes have developed rapidly for decades. Although reactive dye dyeing technology has developed rapidly, there are still many problems in its actual dyeing application. Reactive dyes need to add a large amount of sodium sulfate to promote dyeing during the dyeing process, and at the same time need to add strong alkali to produce dye intermediates that can react with fibers. Flowers, uneven dyeing and other problems. [0003] Dye liquor system is a very complex system. Common methods for evaluating the degree of aggregation and precipitation of dyes in multi-salt or strong alkali solutions include double-layer filter paper m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/59G01N21/25G01N21/47
Inventor 毛志平吴伟徐红王纯怡钟毅张琳萍王碧佳隋晓锋陈支泽冯雪凌
Owner DONGHUA UNIV