Perylene-Based Fluorescent Sizing Agent for Precise Evaluation of Permeability and Coating Property of Sizing Paste
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RESEARCH ARTICLE
Perylene‑Based Fluorescent Sizing Agent for Precise Evaluation of Permeability and Coating Property of Sizing Paste Enqi Jin1,2 · Zhengke Wang1 · Qiaoling Hu1 · Manli Li2 · Jiugang Yuan3 Received: 29 February 2020 / Accepted: 13 June 2020 © Donghua University, Shanghai, China 2020
Abstract Warp sizing is considered as the most important process of weaving preparation in the textile field. The quality of sized warp yarns is directly determined by the permeation and coating of sizing paste into/on warp yarns. However, many significant flaws of the current method of permeability and coating property of sizing paste, such as low accuracy and narrow variety adaptability for sizing agents and warp yarns, have emerged in the evaluation process. In order to eliminate the inherent flaws in the current method, the investigation chose chitosan (CS) as a representative of common sizing agents, introduced various amounts of perylene units onto molecular chains of the CS, and prepared a new functional sizing agent—fluorescent CS with different labeling degrees of perylene. Furthermore, PVA-perylene was synthesized to evaluate the permeability and coating property of PVA sizing paste. Then, three indexes to indicate the permeability and coating property of sizing paste, i.e. permeation percentage, coating percentage and integrity percentage of sizing film, were evaluated using the CS-perylene and PVA-perylene derivatives prepared. Due to the fluorescence emitted by the perylene units, the three indexes can be determined accurately and conveniently depending on only fluorescent microscope and common image processing software. The investigation efficiently solves the difficult problem of evaluating permeation and coating property of the pastes of both bio-based and petroleum-based sizing agents with appropriate degrees of labeling and has a significant guiding function on accurate determination of the quality of sized yarns. Keywords Fluorescent sizing agent · Perylene · Chitosan · PVA · Permeability · Coating property
Introduction Warp sizing is a major process of weaving preparation and determines the weaving efficiency directly [1–3]. Sizing agent is a basic material in the process, acts as a polymer adhesive and its consumption ranks only second to fibre Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42765-020-00050-y) contains supplementary material, which is available to authorized users. * Zhengke Wang [email protected] 1
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
2
College of Textiles and Apparel, Shaoxing University, Shaoxing 312000, China
3
College of Textiles and Apparel, Jiangnan University, Wuxi 214122, China
material in textile industry [4]. The sizing paste adsorbed by warp yarns is generally divided into two parts during the sizing process. One part coats the surface of the yarn to form sizing film and the other
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