The Development of Acrylate-terminated Waterborne Polyurethane with Waterproofing and Breathability Applied on Nylon Fabric Surface

• Main Authors: Chi-Ping Yang, 楊啟平
• Other Authors: Chung-Feng Jeffrey Kuo
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/693kmx

碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 106 === In this study, water-based polyurethanes with moisture permeability and water-repellent properties were synthesized and applied to the research and development of nylon fabrics. Through the innovation of materials and chemical structure, it replaces the traditional toxic additives in the preparation of moisture-permeable water-repellent materials and organic fluorides that cause volatile organic compounds (VOC) environmental protection issues. It also reduces the use of organic solvents and achieves the stability of synthetic processing fluids and imparts moisture permeability. The function of water. The research is divided into two parts. The first part is the development of water-based polyurethane moisture-permeable anti-water-repellent processing liquid; the second part is the process parameter design of water-based polyurethane moisture-permeable anti-water-repellent processing liquid. By utilizing the change of the structure of the acrylic resin and the addition reaction of the aqueous polyurethane, the polymer has the advantages of both the aqueous polyurethane and the acrylic resin, which not only improves the mechanical properties and thermal properties of the nylon fabric, but also imparts moisture permeability and protection to the nylon fabric. The function of water transfer helps to enhance the application of functional textiles. In the first part, after synthesizing prepolymer of diphenylmethane diisocyanate (MDI) with polyethylene glycol (PEG) and hydrophilic chain extender 2,2-dimethylolpropionic acid (DMPA), pre-synthesized acrylic acid was added. The octaester homopolymer (PSA) is terminated with an isocyanate group (NCO) of the prepolymer to form a water-based polyurethane with acrylate terminal (WPUA). And using dimethylacetamide (DMAC) as a neutralizing agent to form an aqueous polyurethane emulsion with ionic groups dispersed in water, using gel permeation chromatography (GPC), laser particle size analyzer (DLS) The effects of the weight percentage of ionic groups and WPU formed by DMAC and DMPA on the molecular weight, particle size and emulsion stability of the polymer were investigated. The structure of WPUA was determined by Fourier transform infrared spectroscopy (FT-IR) to investigate the weight of PSA. Percentage and molecular weight on the thermal properties of WPUA and on the moisture permeable and water repellent properties of fabrics. 20% of the synthesized WPUA was pressed onto the nylon cloth, and SEM was observed to adsorb the processing liquid on the surface of the fiber, and the contact angle with the water droplets and the gas permeability of the water vapor were further measured as an index of moisture permeability and water repellent. The results showed that the contact angle of nylon cloth after WPUA processing was significantly improved, and the water-repellent effect was achieved, and the moisture permeability was improved by 23.75%. The second part is the process parameter design of water-based polyurethane moisture-permeable anti-water-repellent processing fluid. The Taguchi method is used to experimentally plan the ionic group ratio of DMPA and DMAC, and the process parameters of PSA molecular weight and its ratio, and use gray correlation analysis method. Quality analysis explored the influence of experimental parameters on the moisture permeability of nylon fabrics. The optimized results show that the WCA of the nylon fabric not processed by WPU is 27.81°, the property gain is 386.6%; the WVP of nylon fabric not processed by WPU is 1247.89 g/m2×24hr; the property gain is 82%.