Abstract:
The paper reports the results of the study on the hydrolytic
stability of films obtained from aqueous dispersions of polyurethane
ionomers of sulfonate and carboxylate types, in particular the effect
of the process duration of films in aqueous solutions of soda and
surface-active substances on the bursting tension during stretching
was investigated. This indicator is important when using dispersions
as binders in pigment compositions for the printing of textile materials,
because the indicators of the stability of colorings to wet treatments,
in particular to washing, depend on the properties of dispersions. It
was found that the investigated polyurethane ionomers do not provide
the stability indicators, which would be expected from a polyurethane
nature of the binder. An assumption was made that this results from
an insufficient stability of some polyurethanes to hydrolysis. For
increasing the polymer stability to hydrolysis and the stability of
colorings to wet treatments, we tested the possibility of increasing the
density of a three-dimensional structure of polyurethane. To this
end, pre-condensates of thermosetting resins, which are widely used
in finishing works, were used. An increase in the stability of both
films of polyurethane ionomers and the coloring formed was stated
when using the binders of the specified type in the presence of precondensates of thermosetting resins. The mechanism of the action of
the pre-condensates of thermosetting resins was determined in the
formation of polyurethane films. It was established that a high
efficiency of additives of pre-condensates of thermosetting resins
towards the polyurethane binder is ensured by the resin formation
and the formation of a composite-type film with increased strength
characteristics on the surface of a fabric. The formation of a polymer
system of the specified type provides high coloring stability and
improves performance characteristics of a textile material.
Description:
Попович, Т. А. Підвищення гідролітичної стійкості плівок поліуретанових іономерів, що використовуються для пігментних забарвлень / Т. А. Попович, Г. В. Міщенко, О. В. Міщенко, О. О. Венгер, Д. С. Качук // Питання хімії та хімічної технології. - 2019. - № 5. - С. 84-92.
