Screen Printing of Cotton Fabric with Hydrochromic Paste: Evaluation of Color Uniformity, Reversibility and Fastness Properties

Abstract

Smart textiles are promising for the future of the textile industry, providing natural fibers with attractive and interactive features. Within this context, it is possible to emphasize the chromic materials, as, for example, the hydrochromic, which alter their visual properties (color) through an external stimulus (water). The purpose of this work is to functionalize and characterize cotton knitted fabric with hydrochromic agent studying the reversibility and fastness properties of the print. It was observed that the particles are well dispersed and adhered to the natural fiber surface and did not display significant changes in the color after subsequent washing and rubbing fastness cycles. 摘要 智能纺织品为纺织工业的未来带来了希望，它提供了具有吸引力和互动功 能的天然纤维. 在这种情况下，可以强调铬材料，例如水变色材料，通过 外部刺激(水)改变其视觉特性(颜色). 本研究的目的是利用水致变色 剂对棉针织物进行功能化和表征，研究印花的可逆性和牢度性能. 经观 察，这些颗粒在天然纤维表面分散良好，粘附在纤维表面，在随后的洗涤 和摩擦牢度循环后，颜色没有明显变化.

Chromic textiles: Colour fastness properties and irreversible colour change behaviour of textiles screen printed with thermochromic, photochromic and hydrochromic colourants

“…Although, since the HC pigment is white, the result to consider should be colour change value, which highlights a low rub fastness property. Taking into account that previous work attained good stability to rubbing of the same HC ink screen printed in a cotton fabric, 6 rub fastness of the HC paste suggests dependence on the substrate used.…”

“…HC change from opaque in dried state, to transparent in the presence of moisture or water 2,3 . The main aims of the previous research included the development of instrumental processes of paste recipe formulation with TC to create textiles that change colour according to a predefined colour ratio, also encompassing a more reliable pigment use 4,5 ; chromic materials' properties evaluation and the study of variables that can influence their expressions and behaviour 6–8 …”

“…Gauche et al 6 studied the resistance of a HC paste screen printed on a 100% cotton fabric. Washing fastness was tested for one, five and ten cycles, attaining excellent colour changing grades between 4–5 and 5.…”

“…2,3 The main aims of the previous research included the development of instrumental processes of paste recipe formulation with TC to create textiles that change colour according to a predefined colour ratio, also encompassing a more reliable pigment use 4,5 ; chromic materials' properties evaluation and the study of variables that can influence their expressions and behaviour. [6][7][8] Considering external conditions that textile applications are commonly exposed to, variables affecting chromic colours and behaviour encompass the stimulus type that each pigment reacts to reversibly, as well as factors that can produce a permanent effect, namely UV radiation, washing, high temperature. The effect depends on the colourants' fastness properties, meaning its ability to remain stable under specific conditions.…”

Synthesis and application of aminosiloxane‐modified cationic waterborne polyurethane as fixing agent for nylon fabric

“…These factors include friction, washing, sun, sea water, saliva, sweat, and so on. Low color fastness would cause textile to fade and even contaminate other clothing after repeated wearing or washing 1–3 . More seriously, the transfer of dyes from textiles to human skin may damage health.…”