Preparation process of diamond fine polishing PU abrasive paper and diamond fine polishing PU abrasive paper

The invention relates to a preparation technology of diamond fine polishing PU abrasive paper and the diamond fine polishing PU abrasive paper, and relates to the technical field of polishing and grinding materials. The diamond fine polishing PU abrasive paper comprises a grinding layer, a base body layer and a bonding layer, and the bonding layer and the grinding layer are arranged on the two sides of the base body layer respectively. The grinding layer comprises the following materials: 10%-25% of a grinding material; 65%-85% of PU polyurethane resin; 2%-4% of a surfactant; 2%-3% of a structural additive; and 1%-2% of a curing agent. The diamond fine polishing PU abrasive paper prepared through the preparation technology comprises the following preparation steps that the thin film layer is laid on one face of the base body layer, then the grinding layer is laid on the thin film layer, heating and pressurizing are conducted, baking is conducted for 5-10 min, and cooling is conducted for use; coating the othe