Lun Nie,Xiaohua Xu,Yufeng Chen,Yingping Dong,Guangtao Chang,Ruoxin Li
Inkjet printing technology is widely used in the textile digital printing application today though the current technology still requires pretreatment and postwashing procedures before and after printing. Additional chemical treatment generates a large amount of wastewater and complicates the process. Among the many potential approaches for reducing chemical waste, pigments with self-dispersing capability were prepared and formulated into binder-free inkjet inks that require no pretreatment or after-washing process when printing cotton fabrics. The new self-dispersing pigment inks were tested and evaluated on cotton fabrics. The distribution of particles was between 122.2 and 188.5 nm, and inks have excellent storage capability. Printed fabrics’ light fastness and acid/alkali resistance are about grade 5, and printed cotton’s washing and rubbing fastness are above grade 3. The mechanism and performance of ink drops were investigated by LF-NMR and ink-drop observation methods. This work provides a possible solution for reducing wastewater in the textile industry.
Chengling Huang,Hou-Yong Yu,Lumin Chen,Bin Xue,Yunfei Shen,Jiayuan Shen,Kam Chiu Tam
Following global trends in launching plastic bans driven by the increasing problem of non-degradable plastic polluting the environment, cellulose as an abundant natural polymer has gradually been exploited as an eco-friendly material. Nevertheless, there are two challenging problems to overcome: it is hard to dissolve and heat seal (self-bonding under heat and pressing) cellulose, which hinder cellulose materials from replacing plastic. Here, a binder-free method is proposed to realize the bonding of cellulose film without any other binders. The heat-sealable cellulose film was fabricated with a low bonding temperature of 78 °C and high transparency of 90%. Furthermore, glycerol and sorbitol were introduced in the cellulose film not only to reduce the brittleness of the films but also to assist the confined-solvent-driven process. Possible mechanisms of self-bonding and for the tunable concentration range of the residual solvent, which was crucial for the self-bonding, are reported. Additionally, a sealed cellulose-based band and bags were successfully made, indicating the potential of our heat-sealable cellulose films to overcome the inherent limitations of cellulose and boost the potential use of cellulose films as candidates to replace plastic.
For cotton fabrics, conventional reactive dyeing in a water bath typically involves substantial consumption of salt, water, and energy, along with the discharge of colored, high-salt wastewater. In this study, we reported a cleaner, shorter process and binder-free pad-cure dyeing technique for cotton fabrics using cationic fluorosilicone-modified polymer/pigment (FSi-Polymer/Pigment) hybrid latexes with less water and energy consumption. It was revealed that, compared with binder-pigment color paste pad dyeing, the higher affinity and color depth (3 times higher), higher rubbing fastness (grades 4–5) and washing fastness (grade 4) of binder-free dyed cotton fabrics were significantly improved, and the breathability and softness were closer to that of the original cotton fabric. More importantly, FSi-Polymer/Pigment hybrid latexes had good color regulation and matching properties, and the dyed cotton exhibited high antifouling and ultraviolet protection performances. Compared with conventional reactive pad dyeing, this process significantly reduced water consumption and carbon dioxide emissions decreasing by 99.9 % and 71.2 %, respectively, which facilitated the low-carbon advancement of cash crops and products within the printing and dyeing sector. In summary, this dyeing technology offers significant economic and environmental benefits, which hold promising application prospects in the cotton dyeing industry.
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