Application properties of polyurethane coating agent

Three kinds of hydrophilic polyurethane coating agents with different structures and components were synthesized for the sake of investigating the relationships between its application property,physio-chemical structure,and components.Several representative properties of the coated fabric,for example,moisture permeability,and water repellency were tested.Furthermore,the micro-structure and surface property of the polyurethanes were studied by wide angle X-ray diffraction(WAXD) and surface tension/contact angle testing instruments.The findings show that the moisture permeability and water repellency of the coated fabric mainly depend on the content of hydrophilic ether group and the proportion of the hard segment to the soft in polyurethane.