Diffusion Mechanism of Aqueous Solutions and Swelling of Cellulosic Fibers in Silicone Non-Aqueous Dyeing System

Abstract

The main goal of this article is to study the diffusion mechanism of aqueous solutions and the swelling of cellulosic fibers in the silicone non-aqueous dyeing system via fluorescent labeling. Due to non-polar media only adsorbing on the surface of fiber, cellulosic fiber could not swell as a result of the non-polar media. However, because water molecules can diffuse into the non-crystalline region of the fiber, cellulosic fiber could swell by water which was dispersed or emulsified in a non-aqueous dyeing system. To study the diffusion mechanism of an aqueous solution in the siloxane non-aqueous dyeing system, siloxane non-aqueous media was first diffused to the cellulosic fiber because of its lower surface tension. The resulting aqueous solution took more time to diffuse the surface of the cellulosic fiber, because water molecules must penetrate the siloxane non-aqueous media film. Compared with the fluorescent intensity of the fiber surface, the siloxane film could be re-transferred to the dye bath under the emulsification of the surfactant and the mechanical force. Therefore, a longer diffusion time of the aqueous solution ensured the dyeing feasibility for cellulosic fiber in the non-aqueous dyeing system.

Non‐aqueous dyeing of cotton fibre with reactive dyes: A review

“…With the aim of developing a whole system of D5 reactive dyeing of cotton fibre, Fu et al reported an optimised soaping process for cotton fabric dyed in a D5 suspension dyeing system using Hexadecyl trimethyl ammonium bromide (HTAB) as a soaping agent, and their results showed that the water consumption of the entire process was only 7‐fold that of fabric mass. With the use of different solvents as dyeing media, Wang et al studied the dyeing properties and adsorption kinetics of reactive dyes for cotton woven fabric in a dye/solvent non‐aqueous dyeing system, while Pei et al investigated the diffusion mechanism of an aqueous solution and the swelling of cotton and viscose yarns in a dye/solvent non‐aqueous dyeing system.…”

“…Due to growing environmental concerns, several alternative methods for dyeing cotton fibre have been investigated and reported in the literature, including neutral pH dyeing, supercritical carbon dioxide dyeing, reverse micellar dyeing, low‐salt or salt‐free dyeing, clay nanoparticle dyeing, silicone‐based dyeing, two‐solvent miscible dyeing, dyeing with reused wastewater, dye‐solvent suspension dyeing and natural mordant dyeing . The addition of different dyeing methods, modifications of fibre properties (such as cotton cationisation and polymer grafting on cotton), inventions of new reactive dyes with reduced requirements for salt and soda ash, and advancements in effluent treatment technologies, have also been reported.…”

Effect of Pretreatments on Wettability and Dyeing Property of Cotton Fibers in an Environmentally Friendly Dyeing System

“…This interesting phenomenon might influence the dye leveling property. 22 In this investigation, cotton fibers with various wettability properties were prepared using various pretreatments. The relationship between wax and pectin content and cotton fiber wettability was studied.…”

Preparation of Reswellable Amorphous Porous Celluloses through Hydrogelation from Ionic Liquid Solutions

“…For example, cellulosic flexible materials can be fabricated by adding plasticizers, such as cellophane with glycerin [2]. A number of swelling approaches for cellulose have also been performed to provide soft materials, such as in the case of hydrogels [3,4,5,6]. In addition to their flexible properties, the acylation of hydroxy groups on cellulose chains is a useful method to exhibit thermoplasticity in cellulosic materials, such as in the practically used cellulose triacetate [7].…”