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Mar . 20, 2024 09:32 Back to list

a preparation method for bromindigo dyestuff

a preparation method for bromindigo dyestuff, is characterized in that: by the indigo oil of mirbane that is dissolved in, add bromizating agent, after reacting by heating 4-15h, with after organic solvent washing, filter to obtain filter cake, filter cake is with being drying to obtain product after hot wash.

indigo blue vat blue

 
2. the preparation method of bromindigo dyestuff according to claim 1, is characterized in that: described bromizating agent is bromine.
 
3. the preparation method of bromindigo dyestuff according to claim 1 and 2, is characterized in that: the 8-18 that described oil of mirbane consumption is indigo quality doubly.
 
4. the preparation method of bromindigo dyestuff according to claim 1 and 2, is characterized in that: the 11-14 that described oil of mirbane consumption is indigo quality doubly.
 
5. the preparation method of bromindigo dyestuff according to claim 1 and 2, is characterized in that: the organic solvent of described washing use is methyl alcohol.
 
6. the preparation method of bromindigo dyestuff according to claim 2, is characterized in that: described bromine is added dropwise in indigo oil of mirbane mixing solutions in 3-4h, and the mixed solution system described in dropping process is in 50 ± 2 DEG C of constant temperature.

Bromo indigo; Vat bromo-indigo; C.I.Vat blue 5

7. the preparation method of bromindigo dyestuff according to claim 2, is characterized in that: described bromine and indigo mol ratio are 4-6:1.
 
8. the preparation method of bromindigo dyestuff according to claim 2, is characterized in that: described bromine and indigo mol ratio are 5.2-5.6:1.
 
9. the preparation method of bromindigo dyestuff according to claim 5, is characterized in that: described heating steps temperature is 80-150 DEG C.
 
10. the preparation method of bromindigo dyestuff according to claim 6, is characterized in that: described reacting by heating step temperature is 120-130 DEG C.
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