Synthesis and coating properties of sulfonated calixarene‐based waterborne polyurethane hydrotalcite nanocomposite

Abstract In this article, sulfonated calixarene was used to modify Mg‐Al hydrotalcite (Mg‐Al‐LDH) prepared by coprecipitation method to improve the interfacial compatibility between nano‐hydrotalcite and waterborne polyurethane (WPU) matrix. Waterborne polyurethane hydrotalcite nanocomposite emulsion (STCR‐LDH/WPU) was prepared by adding modified hydrotalcite into WPU. The tensile strength, surface static contact angle, water permeability rate, and water absorption of the film were measured. FTIR and X‐ray diffraction were used to determine the film‐forming properties. The results showed that the tensile strength increased to 57 MPa, the elongation at break reached 292%, and its water vapor permeability and UV resistance were significantly improved by introducing sulfonated calixarene to modify the hydrotalcite nanosheet structure based on WPU. The compound emulsion gives the coated leather excellent physical and mechanical properties, and the laminated leather has stronger coating abrasion resistance.