Tisk pH odzivnega barvila na tekstil

Gerl, Ana (author), Kert, Mateja (mentor)

V diplomskem delu smo preučevali vpliv tiskarske paste, tekstilnega substrata in postopka fiksiranja na pH-odzivnost bombažne in poliamidne tkanine, potiskane z indikatorskim barvilom bromokrezol zeleno s tehniko ploskega filmskega tiska. Barvilo smo nanesli na tkanino v obliki pigmentne tiskarske paste in tiskarske paste za tisk poliamida s kislimi barvili. Uporabili smo dve vrsti fiksiranja tiskov, in sicer toplo-zračno fiksiranje pri 150 °C in času 5 minut ter normalno parjenje pri 100–102 °C in času 30 minut. Vpliv postopka tiskanja na spremembo mehansko-fizikalnih lastnosti tkanine smo testirali v skladu z veljavnimi SIST EN ISO standardi. Barvo vzorcev pred potopitvijo potiskanih vzorcev v pufrske raztopine različnih vrednosti pH in po njej smo spektrofotometrično ovrednotili. Določili smo barvne obstojnosti proti drgnjenju, pranju in na svetlobi. S postopkom tiskanja smo uspešno oblikoval pH odzivno tekstilijo in tako dokazali, da je postopek tiskanja lahko tudi eden od postopkov aplikacije indikatorskega barvila na tekstilni substrat. Nanos tiskarske paste na vzorce bombažne in poliamidne tkanine je povzročil spremembo mehansko-fizikalnih lastnosti proučevanih tkanin. Hitrost odziva potiskane tkanine na spremembo vrednosti pH je odvisna od surovinske sestave tekstilije in sposobnosti omakanja tekstilije s pufrskimi raztopinami. Barvne obstojnosti potiskanih tkanin na suho in mokro drgnjenje so odlične. Pri preizkušanju barvnih obstojnosti na pranje smo ugotovili, da je potiskana poliamidna tkanina bolj obstojna kot potiskana bombažna tkanina. Potiskani tkanini sta zelo slabo barvno obstojni na svetlobi

• Language: Slovenian
• Keywords: pH odzivnost, ploski filmski tisk, bromokrezol zelena, poliamid, bombaž
• Work type: Bachelor thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2021
• PID: 20.500.12556/RUL-130233
• Publication date in RUL: 11.09.2021

Secondary language

• Language: English
• Title: Printing of pH responsive dye to textile

Abstract

This bachelor thesis aims to study the influence of the printing paste, the textile substrate, and the method of fixation on the pH sensitivity of the indicator dye bromocresol green, applied on polyamide and cotton fabric using the flat screen printing technique. The dye was applied in the form of pigment printing paste and printing paste for printing polyamide with acid dyes. Two types of fixations were used; heat fixation at 150°C for 5 minutes and normal steaming at 100 - 102°C, 30 minutes. The influence of the printing process on the change of mechanical and physical properties of the fabric was tested according to the valid SIST EN ISO standards. The colour of samples, before and after their immersion in the buffer solutions with different pH values, was evaluated spectrophotometrically. The colour fastness of the printed textiles to rubbing, washing and light was also investigated. The pH sensitive textile was successfully developed by printing, which proved that the printing process could be one of the methods used to apply the indicator dye to the textile substrate. The application of printing paste on cotton and polyamide fabric caused a change in the mechanical and physical properties of the studied materials. The speed of response of printed fabrics to the change in pH depends on the types of fibres and the wetting ability of the fabric with buffer solutions. The colour fastness of printed fabrics to dry and wet rubbing is excellent. Printed polyamide fabric is more resistant to washing than printed cotton fabric. Both printed fabrics display poor colour fastness to light.

• Keywords: pH sensitivity, flat screen printing, bromocresol green, polyamide, cotton