Preparation method and application of cationic fluoride-free polyurethane-acrylate water repellent

The invention discloses a preparation method and application of a cationic fluoride-free polyurethane-acrylate water repellent, and belongs to the technical field of environment-friendly polymers. According to the invention, by introducing a carbon-carbon double bond into a polyurethane side chain, polyurethane and acrylate can be combined more, a branched structure is generated, and the compatibility of polyurethane and acrylate is improved; a metered acrylate monomer is added in the chain extension process of synthesizing waterborne polyurethane, meanwhile, a rough factor nano silicon dioxide is effectively introduced, acrylate can be well wrapped in the waterborne polyurethane in the process that water is added for emulsification to generate phase inversion, and then polymerization is performed to obtain the cationic fluoride-free polyurethane-acrylate water repellent. The obtained water repellent is simpler in use process, saves resources, and has better water repellency, hydrostatic pressure resistance,