Tecnologie Industriali & Informatica

The dyeing and the oxidation of wool at room temperature: By Aldo Malara      • A characteristic of dmso together with others applications in textile field already explained is related to the dyeing of fibers, particularly to dyeing wool textiles manufacturing. • We can point out that we have positively dyed a flat wool fabric without utilizing water. The new solvent used is dmso, dimethyl sulfoxide. • To explain the interaction with dyes we have to remember others characteristic of this solvent. It is already employed for years as stripping agent for paint, and its affinity towards organic and inorganic dyes is well documented in the industry for this solvent. As we have seen also the wool dyed with non reactive dyes is well stripped at 60 degrees Celsius in a few seconds. • As the water is a good solvent for textile dyes, the dmso has better characteristics of solvency. • Moreover it is used as solvent in reactions of nucleophilic substitution to build up molecules also...

  Another extremely efficient, quick and simple use of DMSO is in the removal of inks from films and printed labels. We have carried out various tests on different polymeric bases, in particular the classic PE PP PET, obtaining perfect cleaning in a few seconds in 95% of cases. In  post-process DMSO is then subjected to simple filtering. This application of the solvent does not require particular mechanical movement and also works in a static tank, with longer times. Obviously, light movement drastically reduces cleaning times. Consequently, the system costs, given by the extreme efficiency of the solvent and its peculiar safety characteristics, are very low, also due to the fact that the process takes place at room temperature (20/25 degrees celsius) or at most 38/40 degrees Celsius. Un altro uso del DMSO estremamente efficente, rapido quanto semplice, e' nella rimozione degli inchiostri da film ed etichette stampate. Abbiamo effettuato vari test su diverse basi polimeriche, ...