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

Liujun Pei,Xiaomin Gu,Yuni Luo,Jiping Wang,Huashu Dou

doi:10.3390/polym11030411

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.

Highlights

Nowadays, non-aqueous dyeing systems are a promising new ecological dyeing technology which uses non-polar media to substitute for the traditional water base [1,2,3]
Fiber swelling is an important factor for the reactive dyeing
This study investigates the diffusion mechanism of an aqueous solution and the swelling of

Summary

Introduction

Non-aqueous dyeing systems are a promising new ecological dyeing technology which uses non-polar media to substitute for the traditional water base [1,2,3]. Non-aqueous dyeing media can neither dissolve the water soluble dye nor water, but it can transport material and transfer energy. The dye, alkali agent, and other dyeing auxiliaries are dissolved in a small amount of water which is dispersed or emulsified in non-polar media [4]. A small amount of aqueous solution is needed in the dyeing system because the dye and other chemical agents dissolve, and the swelling of fiber just needs a little water. The aqueous solution has a strong affinity to fiber and an aversion to non-polar media in the non-aqueous dyeing system [5]. The entire aqueous solution can be absorbed by the hydrophilic fibers

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