Synthesis and coating characteristics of novel calcium-containing poly(urethane ethers)

摘要

Calcium salt of mono(hydroxypentyl)phthalate [Ca(HPP)(2)] was synthesized by the reaction of 1,5-pentanediol, phthalic anhydride, and calcium acetate. Calcium-containing poly(urethane ethers) (PUEs) were synthesized by the reaction of hexamethylene diisocyanate (HMDI) or toluylene 2,4-diisocyanate (TDI) with a mixture of Ca(HPP)(2) and poly(ethylene glycol) (PEG(300) or PEG(400)) with di-nbutyltin dilaurate as a catalyst. We synthesized a series of calcium-containing PUEs with different compositions by taking the molar ratio of Ca(HPP)(2) PEG(300) or PEG(400) diisocyanate (HMDI or TDI) as 2 : 2 4, 3 : 1 : 4, and 1 : 3 4 to study the coating properties of the PUEs. Blank PUEs without a calcium-containing ionic diol were also prepared by the reaction of PEG(300) or PEG(400) with HMDI or TDI. The PUEs were well characterized by fourier transform infrared spectroscopy, (HNMR)-H-1, C-13-NMR, solid-state cross-polarity/magic-angle spinning C-13-NMR, viscosity, solubility, and X-ray diffraction studies. The thermal properties of the polymers were also studied with thermogravimetric analysis and differential scanning calorimetry. The PUEs were applied as a top coat on acrylic-coated leather, and their physicome-chanical properties were also studied. The coating properties of PUEs, including tensile strength, elongation at break, tear strength, water vapor permeability, flexing endurance, cold crack resistance, abrasion resistance, color fastness, and adhesive strength, were better than the standard values. (C) 2004 Wiley Periodicals, Inc. [References: 24]