Preparation and characterization of waterborne polyurethane nail enamel modified by silane coupling agent
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Preparation and characterization of waterborne polyurethane nail enamel modified by silane coupling agent Xiaoxiao Peng, Yan Liu, Binjie Xin, Hengyi Guo, Yunge Yu
Ó American Coatings Association 2020 Abstract Intended for preparing silane-modified waterborne polyurethane dispersions and then applying them to the development of environmentally friendly nail enamels, the synthesis mechanism was investigated in this paper to determine the optimal technological parameters. Aimed at the synthesis of waterborne polyurethane dispersions, a one-step method was conducted on the prepolymers and the main raw materials, isophorone diisocyanate (IPDI), polycaprolactone diol (PCL), 1,4-butanediol (BDO), 2,2dimethylol butyric acid (DMBA), (3-aminopropyl) triethoxysilane (APTES), triethylamine (TEA) and solvent water, were adopted. Subsequently, the waterbased nail enamel together with its dry film was prepared by pigments and functional additives. Morphological characteristics and chemical composition of dry film of nail enamel were characterized by using atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). The crystallinity of film was analyzed by an X-ray diffractometer (XRD). Benefiting from a thermogravimetric analyzer (TG) and differential thermal analyzer (DSC), the thermal properties of the prepared film were characterized. The hardness, adhesion, glossiness, water absorption, drying time and some other indicators of the water-based nail enamel were tested using a loading pencil hardness tester and other equipment. The experimental results showed the waterborne polyurethane modified by silane coupling agent exhibited favorable film-forming X. Peng, Y. Liu (&), H. Guo, Y. Yu College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Songjiang, Shanghai 201620, China e-mail: [email protected] B. Xin (&) School of Fashion Engineering, Shanghai University of Engineering Science, Songjiang, Shanghai 201620, China e-mail: [email protected]
property, glossiness, flexibility, hardness, and adhesion and can be used for developing the environmentally friendly water-based nail enamel with a concentration of silane coupling agent of 1.5%, showing a broad market prospect in the cosmetics field. Keywords Waterborne polyurethane, Silane coupling agent, Water-based nail enamel, One-step synthesis, Polyurethane modification
Introduction Polyurethane (PU), containing a repeating carbamate (-NHCOO-) structure in its main chain, is deemed as a kind of polymer segment.1 It is commonly known that the PU properties are mainly determined by the structures of soft segment and hard segment. The soft segment is usually composed of oligomeric polyols; by contrast, the hard segment generally consists of diisocyanate and small molecule chain extenders. The flexibility of material selection in both hard and soft segments makes PU possess many different chemical structures and microphase separation degrees, and, as a result, PU presents excellent elastic range, tensile strength, rubbing
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