Highly water-resistant transparent waterborne polyurethane thermal-insulation coating material with multiple self-crosslinking network based on controllably activated end-capping reagent

In this study, a kind of waterborne polyurethane coating material with excellent water resistance performance has been prepared through the cross-linking of waterborne polyurethane (WPU) with a combination of multiple blocking agents applied. And then, with modified SiO2 aerogel (SSA) added into the water-resistant waterborne polyurethane (FWPU), the highly water-resistant transparent waterborne polyurethane thermal insulation coating material was obtained. Basically, the addition of SSA has no impact on the water resistance performance of FWPU. Furthermore, through the proper addition of SSA, the adhesive force and heat insulation performance of the composite coating material can be improved. When the SSA content accounts for a 15 % solid content of FWPU, the composite coating present the best comprehensive performance. This highly water-resistant transparent waterborne polyurethane thermal-insulation coating material has the prospect of being used as thermal insulation surface coating on transparent materials such as building glass.