Urea in Reactive Dyeing

Abstract

The effect of urea on formation and cleavage of a covalent bond between a reactive dye and cellulose has been investigated. The evidence presented is consistent with the view that urea increases the bonded dye yield by keeping the reactive dye in solution during the diffusion of the dye to its reaction site. Urea does not increase the water content of the fabric by retarding evaporation during drying; with urea, the water content of the fabric is lower. Urea can also decrease the bonded dye yield. In combination with alkali and heat, urea enhances cleavage of an ether-type dye-cellulose bond, but has only a slight effect on an ester-type bond. The over-all effect of urea on reactive dyeing is shown to depend upon the solvolytic stability of a dye-fiber bond under specific dyeing conditions.

Keywords

Reactive Dyeing Dye Fixing Agents Dyeing Auxiliaries Urea Cotton Fabrics Pad Dyeing Covalent Bonds Dye Fixing Solubility Drying

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References

1. Baumgarte

, On the Influence of Urea Additions on the Fixation of Reactive Dyes on Cellulose Fibers, Melliand Textilber. 46, 851–856 (1965).

2. Bergmann

E. D.

Ginsburg

Pappo

, “Organic Reactions,” Vol. 10, 1959, p. 179.

3. Brindley

R. A.

Rattee

I. D.

, The Use of Procion Dyes in Continuous Processes, Melliand Textilber. 39, 1017–1022 (1958).

4. Capponi

, Dyeing with Drimaren-Z Dyes by Padding Methods, SVF 16, 229–236 (1961).

5. Clow

, Delinquescence in Urea and Methylureas, Nature 146, 26 (1940).

6. Cole

J. E.

Jr. Gumprecht

W. H.

, Fr. 1,359,644 (1964).

7. Dawson

T. L.

, in “Procion Dyestuffs in Textile Printing,” ICI, Dyestuffs Div., 1960, p. 42.

8. Heyna

, Reactive Dyes with Vinyl Sulfone Groups, Angew. Chem. 74, 966–969 (1962).

9. Kissa

, U. S. 3,184,284 (1965); U. S. 3,313,797 (1967).

10.

10. Kissa

, Thermofixation of Vinylsulfone Type Reactive Dyes on Cotton, Am. Dyestuff Reptr. 56, 106–108 (1967).

11.

11. Kögel

, Novelties in Printing with Reactive Dyes, SVF 17, 694–703 (1962).

12.

12. Mitchell

John

Jr. Smith

D. M.

, “Aquametry; Application of the Karl Fischer Reagent to Quantitative Analyses Involving Water,” New York, Interscience, 1948.

13.

13. Peter

, New Knowledge of Dyeing with ®Cibacron Dyes, SVF 16, 219–228 (1961).

14.

14. Rattee

I. D.

Seltzer

, in “Procion Dyestuffs in Textile Dyeing,” ICI, Dyestuffs Div., 1962, p. 189.

15.

15. Schaub

H. P.

Ulrich

, Die Infrarot-Fixierung, Eine Weitere Möglichkeit zur Fixierung von ®Cibacron-Farbstoffen, SVF 16, 586–592 (1961).

16.

16. Senn

R. Ch.

Zollinger , Kinetics of Hydrolysis of Reactive Dyes on Cellulose at pH 2–10, Helv. Chim. Acta 46, 781–794 (1963).

17.

17. Ulrich

, Observations and Suggestions for the Application of ®Cibacron Dyes, Textil-Rundschau 14, 427–437 (1959).

18.

18. Ulrich

, On Application of ®Cibacron Dyes by the Cold Pad-Batch Method, SVF 16, 241–247 (1961).

19.

19. Ulrich

Back

, Infrared Fixation of ®Cibacron Dyes, SVF 16, 298–313 (1961).

20.

20. Vickerstaff

, Principles of Reactive Dyeing, Hex. Digest 427, 3 (1958); Textil-Rundschau 13, 267 (1958).

21.

21. Wagner

, Continuous Method for Remazol Dyes, Zeitschr. ges. Textilind. 63, 278–283 (1961).

22.

22. Wegmann

, Contribution to the Knowledge of Reactive Dyes, Textil-Praxis 13, 1056–1061 (1958).

23.

23. Weisz

P. B.

Zollinger

, The Fundamental Meaning of Diffusion Coefficients in Dyeing Processes. I. Diffusion of Dyes, Melliand Textilber. 48, 70–75 (1967).

24.

24. Werner

E. A.

, The Constitution of Carbamides. V. Mechanism of the Decomposition of Urea when Heated in Solution with Alkalis and with Acids Respectively, J. Chem. Soc. 113, 84 (1918).

25.

25. Werner

E. A.

, Urea as a Hygroscopic Substance, Nature 139, 512 (1937).