Environment-friendly self-cleaning waterborne polyurethane and preparation method thereof

The invention provides environment-friendly self-cleaning waterborne polyurethane and a preparation method of the waterborne polyurethane. The preparation method comprises the following steps: firstly carrying out microwave heating to decompose titanium peroxide to prepare nanometer titanium dioxide hydrosol in anatase and rutile mixed crystal form; then gradually dropping the nanometer titanium dioxide hydrosol in the waterborne polyurethane, and properly stirring to obtain the self-cleaning waterborne polyurethane. The self-cleaning waterborne polyurethane prepared by the method is of self-cleaning performance such as degrading organic pollutants on the surface through photocatalysis, preventing dust from adhering and sterilizing and mould proofing. In the self-cleaning waterborne polyurethane prepared by the method, the nanometer titanium dioxide is good in dispersity, strong in photocatalysis performance and ultraviolet aging resistance due to the anatase and rutile mixed crystal form; the process for pre