Effect of the Polyols Content on the Properties of the Waterborne Polyurethane
The anionic waterborne polyurethane emulsion was synthesized with the chemicals such as is ophoronediisocyanate (IPDI), polycarbonatediol (PCDL-1000), polyethylene-1, 4buthylenea dipateglycol (PBA-2000), dimethylol propionic acid (DMPA) and 2-hydroxyethyl
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Abstract The anionic waterborne polyurethane emulsion was synthesized with the chemicals such as is ophoronediisocyanate (IPDI), polycarbonatediol (PCDL1000), polyethylene-1, 4buthylenea dipateglycol (PBA-2000), dimethylol propionic acid (DMPA) and 2-hydroxyethylacrylate (HEA). The effect of the mole ratio of (PBA/PCDL) on the mechanical properties of the waterborne polyurethane (WPU) dispersion was studied. The chemical structure of emulsion particle was determined by Fourier transform infrared spectroscopy (FT-IR). Some properties were measured such as the particle size of the emulsion, the elongation at break, tensile strength and thermal stability of the film. The results indicated that when increasing the mole ratio of (PBA/PCDL), the tensile strength and thermal stability of the film was improved, the elongation at break was the contrary, and the particle size of the emulsion was increased. The films showed improvement in the thermal stability and mechanical properties when increasing the molecular weight of the polyol due to the increase in the formation of strong interaction between the hard segment and soft segment. The vinyl group on the WPU provides a crosslink site when the polymerization between the WPU and the acrylate. Keywords Waterborne polyurethane
Film Mechanical properties
1 Introduction Waterborne polyurethane dispersions are prepared with a wide range of applications including adhesives, coatings, paints and textile industries [1–3]. They exhibit excellent adhesive properties, low film-forming temperature and flexibility [4]. However the physical and mechanical properties of waterborne polyurethane were insufficient compared with solvent based polyurethane. Furthermore, the better X. Wang F. Chu (&) College of Printing and Packing Engineering, Qilu University of Technology, Jinan, Shandong, China e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2017 P. Zhao et al. (eds.), Advanced Graphic Communications and Media Technologies, Lecture Notes in Electrical Engineering 417, DOI 10.1007/978-981-10-3530-2_108
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performance polyurethane dispersions were generally expensive due to the high cost of raw materials and other additives, which limited the application in some areas. The physical and mechanical properties of the polyurethane film were significantly influenced by the particle size and the structure of the hard and soft segments [5]. The hard segments concluding urethane or urea domains which have strong hydrogen bonding exhibited a great influence on the hardness and resistance of the films. While the soft segments concluding polyols would influence the film flexibilities and resistance [6]. There were varieties of polyols which provided flexibility and cross-linking site during the reaction. Each polyol in the waterborne polyurethane dispersion has their unique nature and plays an important role on the properties of the waterborne polyurethane (WPU). Yildirim and Yurtsevera [7] studied the extent of intermolecular interactions between urethane hard segm
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