Polyurethane rubber for sealing ceramic piston and preparation method thereof

The invention belongs to the technical field of polyurethane rubber products, and particularly relates to polyurethane rubber for sealing a ceramic piston and a preparation method of the polyurethane rubber. The invention relates to a preparation method of a polyurethane rubber sheet for sealing a ceramic piston. The polyurethane rubber sheet comprises the following components: a component A: a curing agent; the component B is prepared from an isocyanato-terminated polyurethane prepolymer; the component B is prepared from the following raw materials: low-molecular-weight polyol, hydrophobic modified polyester polyol, diisocyanate, a wear-resistant agent and a polymerization inhibitor; the polyurethane elastomer which is high in high-temperature hardness, small in high and low temperature hardness change and high in tearing strength is obtained after the component A and the component B are cured in proportion, and the polyurethane elastomer is good in abrasion resistance and hydrophobic effect and meets the re