Substantivity (textile chemistry)

The substantivity describes the ability of a dye (or textile auxiliary) to be absorbed from a liquid medium onto a textile substrate and its fixation on the latter. It is particularly important when dyeing cellulose fibers with so-called substantive dyes ( direct dyes ). Play especially dipolar forces , van der Waals forces and hydrogen-bonds between dye molecules and the cellulose a role. As a result, the ability of the dye to be washed out of the dyed textile is significantly reduced, and the wash fastness is therefore improved.

Henry's distribution coefficient H is a measure of the substantivity in dyeing techniques for textiles :

${\displaystyle {\text{H}}={\frac {\text{Masse Farbstoff auf der Faser}}{\text{Masse Farbstoff im Färbebad}}}}$

It applies

• H> 60%, high substantivity and
• H <40%, low nouns.

The dyeing technique of the exhaust process is particularly suitable for fiber-dye combinations with high substantivity. On the other hand, a high substantivity in the Klotz method and in the Continuue method makes it difficult to dye the textiles evenly.

Individual evidence

1. ↑ Otto-Albrecht Neumüller (Ed.): Römpps Chemie-Lexikon. Volume 5: Pl-S. 8th revised and expanded edition. Franckh'sche Verlagshandlung, Stuttgart 1987, ISBN 3-440-04515-3 , p. 4032.
2. ^ Bertram Philipp, Peter Stevens: Grundzüge der Industrielle Chemie , VCH Verlagsgesellschaft mbH, 1987, p. 330, ISBN 3-527-25991-0 .