Preparation method for waterborne polyurethane synthetic leather Bass

The invention discloses a preparation method for a waterborne polyurethane synthetic leather Bass. The method comprises the following steps of: adding a dispersing agent, a polypropylene powder and a talcum powder to waterborne polyurethane under a stirring condition; after sufficiently dispersing these materials, adding a thickening agent to these materials to stir the materials, so as to obtain a waterborne polyurethane synthetic leather paste; before coating, adding a foam stabilizer to the waterborne polyurethane synthetic leather paste under a stirring condition; bubbling the paste by using compressed air, wherein the bubbling speed is 0.2-0.8 m3/h; and stirring and bubbling the paste for 5-10 minutes at a speed of 600-1000 rpm; and then coating a waterborne polyurethane synthetic leather foaming paste to a base fabric, which is treated by a base fabric treating liquid and ironed by an ironing roller, wherein the coating quantity is 300-600 g/m2; and finally, drying the waterborne polyurethane synthetic leather foaming paste, so as to obtain the waterborne polyurethane synthetic leather Bass. According to the invention, a foaming material has the advantages of rapidness in foaming and good foam stabilizing property; and the preparation method disclosed by the invention has the advantages of simplicity, easiness and easiness for continuous production and is very suitable for large-scale industrial production.