Navy blue reactive dye composition and preparation method thereof
A technology of reactive dyes and compositions, applied in the directions of reactive dyes, azo dyes, organic dyes, etc., can solve the problems of low dye depth, poor levelness, low color fixing rate, etc., and achieve good dye depth and solubility. High, full shade effect
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[0032] The present invention also provides a kind of preparation method of navy blue reactive dye composition, comprises the following steps:
[0033] (1) Take para-ester, H acid, OAVS and DMAVS for subsequent use;
[0034] (2) Adding a dispersant to the para-ester, beating until there are no fine particles, and then carrying out a diazotization reaction to obtain a para-ester diazonium liquid;
[0035] Specifically, add hydrochloric acid to the para-ester after beating, stir evenly and cool down to 0-5°C, then slowly add sodium nitrite solution dropwise, stir at 0-5°C, diazotization reaction for 2 hours, during the reaction Ensure that the reaction solution makes the Congo red test paper blue, and the starch potassium iodide test paper microscopically blue. The end point of the reaction is that there is no yellow intersection with the Ehrlich reagent penetrating circle, and a trace amount of sulfamic acid is added to remove excess sodium nitrite to obtain the Ester diazonium...
Embodiment 1
[0045] The present embodiment provides a navy blue reactive dye composition, which is prepared through the following steps:
[0046] (1) Add dispersant to 31.53g p-(β-hydroxyethyl sulfone sulfate) aniline (i.e. p-position ester), after beating for 1 hour to confirm that no fine particles exist, add 30% hydrochloric acid of 13.65g, stir for 30 Minutes, cool down to 5°C with ice, then slowly add 21.7g of 30% sodium nitrite solution dropwise, control the temperature at 0-5°C and stir for 2 hours. During the heat preservation reaction, ensure that the reaction solution can make the Congo red test paper blue The color of the starch potassium iodide test paper is microscopic blue, and the end point of the reaction is that there is no yellow intersection line with the Ehrlich reagent penetrating circle. Add a small amount of sulfamic acid to remove excess sodium nitrite, so that the starch potassium iodide test paper does not appear microscopic blue, and the right Ester diazonium liq...
Embodiment 2
[0052] In this embodiment, the performance of the navy blue reactive dye composition has been detected.
[0053] (1) Dyeing intensity and shade contrast of reactive dyes
[0054] Respectively adopt reactive blue 250, blue 203 and the navy blue active dye composition prepared in embodiment 1 to dye pure cotton cloth, dyeing process is: the Na of 60g / l 2 SO 4 , 20g / l NaCO 3 , constant temperature staining at 45°C for 90min. The properties of the dyed cotton cloth were tested, and the results are shown in Table 1.
[0055] Table 1 Reactive dye dyeing intensity and shade contrast result
[0056] sample name UV staining intensity DE DL DC DH DA DB Reactive Blue 250 132 135 -0.19 -0.12 -0.27 0.12 0.37 -0.19 Reactive Blue 203 128 127 0.54 0.08 0.68 -0.45 -0.23 0.29 Example 1 135 136 0.28 0.35 0.07 -0.09 0.11 0.17
[0057] (2) Comparison of SERF values of reactive dyes
[0058] Respectively adopt reactive blue...
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