Funcionalização de pasta serigráfica a base d’água com pigmento fotocrômico, para aplicação têxtil e avaliação da qualidade da estampa

Abstract

Printing has several forms of printing, including screen printing, which is a printing process using a screen/frame with silkscreen fabric. It is a very versatile method and can be used as a technique to apply different effects to textile articles. With the advancement of technology in this area, innovative effects are becoming available on the market, one of them being photochromic prints. Considered part of intelligent chromia textiles, with “chameleon” effects, that is, a light stimulus changes the color spontaneously, returning to the original color after some time after the stimulus has been removed. In addition to the photochromic textile, which is activated by UV light stimuli, we have others of the same class that can be highlighted here, hydrochromic (activated by humidity) and thermochromic (activated by heat). This work aimed to functionalize a water-based paste with a photochromic pigment, analyze the color of the print produced under the influence of exposure to UV light, using a spectrophotometer and evaluate its durability in terms of resistance to washing. They were functionalized in two concentrations of photochromic pigments, 1 and 5% pigment. After functionalization and production of the print, when exposed to UV light, the result with 5% concentration of photochromic pigment, demonstrated a dark lilac color and immediate color change response, throughout the moment the print is in place. under the stimulus of light, it remains activated. When removing exposure to UV light, it took 105 seconds to return to the color without stimulation (white). Washing tests. After washing tests, it was found that the print with photochromic effect resists the equivalent of 50 conventional domestic washes.