Preparation and characterization of silicone-modified hyperbranched waterborne polyurethanes

Hyperbranched waterborne polyurethanes (HWPUs) with different APTES contents were prepared using polycarbonate diol (PCDL), isophorone diisocyanate (IPDI), hyperbranched polyester polyol (HBP) and 3-aminopropyltriethoxysilane (APTES). The effect of varying the APTES contents on the surface, emulsion and mechanical properties, as well as on the water resistance and heat resistance of HWPU were investigated. The results showed that when the amount of APTES concentration was 3%, the average particle size of HWPU was 68.2 nm, the tensile strength was 46.5 MPa, and the elongation at break was 432%. The tensile strength was still greater than 30 MPa after 24 h of immersion in water. The initial thermal decomposition temperature exceeded 270 ℃. This work offers a new strategy for the developing of water-based ink for fabric inkjet printing.