Preparation and Film Properties of Hyperbranched Waterborne Polyurethane

Abstract

Hyperbranched polyurethane has low viscosity, solubility enhancement, film-forming performance is good, good water resistance, thermal stability and physical and mechanical properties, so hyperbranched polyurethane gradually becomes a hotspot in research of leather finishing field in theory and applications. In this paper, hydroxyl-terminated hyperbranched polymer (HPAE) was prepared using nuclear “one-step”. Represented by first generation of hydroxyl-terminated hyperbranched polymer, with the polytetramethylene glycol 1000 (PTMG 1000), isophorone diisocyanate (IPDI), 1,4-butanediol (BDO) as the main raw materials, dihydroxy methyl propionic acid (DMPA) as hydrophilic monomer, hyperbranched waterborne polyurethane (HWPU) was synthesized. The structure and properties of hyperbranched waterborne polyurethane were characterized by infrared spectroscopy, scanning electron microscope, atomic force microscope, the X-ray diffraction, the emulsion particle size, thermal gravimetry and other modern instruments and physical and mechanical properties of thin film, film contact angle, heat resistance, water resistance and solvent resistance were studied. The experimental results showed that the heat resistance, solvent resistance and physical and mechanical performance of hyperbranched waterborne polyurethane was significantly enhanced.