A comparative study for using different solvents in pretreatment fabrics and in corporation in printing paste

Abstract

A comparative study is carried out to investigate seven different organic solvents in pretreatment and incorporation in printing pastes of polyester, polyester cotton blends, 50/50 and 65/35 fabrics. The substrates are printed with their compatible dyes, disperse and disperse/reactive. The presence of organic solvents increases the suitability of the dye molecules, which facilitates their transfer from the printed film into the fabric during fixation. All the factors influencing the pretreatment and printing efficiency of the substrates are investigated in detail. The K/S (the color yield of the printed samples) values of the prints along with the water absorption and tensile strength measurements are also determined.

Preparation of thermal transfer ink using disperse fluorescent yellow 82 for polyester substrates

“…The crystallinity of the polyester substrate decreased due to the plasticising effect of polyhydric alcohols, affecting the amorphous region by increasing the disorientation and creating new instantaneous apertures. The number of instantaneous apertures seemed to depend on the swelling abilities of the polyhydric alcohols (Nassar, 2008). The boiling point of diethylene glycol was lower relatively, sufficient amount of polyhydric alcohols were transferred to polyester fabric during the transfer process, and plasticized effect was obvious.…”

Enhancing disperse printing and ultraviolet protecting of polyester-containing fabrics via pretreatment with chitosan/polyethylene glycol/dimethylol dihydroxyethylene urea

“…as well as fixation of chitosan onto/into the fabric and/or onto the finish fabric matrix as discussed before, and the amount of increase is governed by the chemical structure of the substrate as well as its degree of modification via pretreatment, (b) K/S values of the obtained disperse prints are determined by the type of substrate, extent of surface modification to and the type of disperse dye, (c) pretreatment step has practically a positive effect on some fastness properties, that is wash, rubbing and perspiration, while light fastness are the same, without adversely affecting the soft handle, (d) the enhancement in the UV-protection properties follow the decreasing order PET > PET/W > PET/ C > PET/V, irrespective of the used dye, (e) the darker the depth of shade, within the same fabric type, the better the UV-protection level, regardless of the used disperse dye, (f) the excellent UV-protecting capacity of PET substrates compared with other dyed substrates untreated or treated, reflects its high ability to absorb the harmful UV-B radiation with its aromatic units [9,10,18] and (g) the positive role of enhancing both the swelling and the blocking of pores in the cellulose and wool structure by pretreatment, that is better UV-protection, cannot be ruled out [17,19].…”