▎ 摘　　要

NOVELTY - Polymer waterproof plate comprises 30-34 pts. wt. low density polyethylene, 5-9 pts. wt. polypropylene, 5-8 pts. wt. polystyrene, 2-6 pts. wt. graphene, 0.1-0.2 pts. wt. antioxidant, 25-30 pts. wt. paraffin oil, 2-7 pts. wt. lignin, 0.3-0.5 pts. wt. ultraviolet absorber and 3-6 pts. wt. antifoaming agent. USE - Used as polymer waterproof plate. ADVANTAGE - The method is simple, safe and reliable; utilizes antioxidant and antifoaming agent; has low production cost; does not causes pollution; and produces waterproof plate which has strong hydrophobicity and long service life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing polymer waterproof plate comprising (i) mixing uniformly low density polyethylene, polypropylene, polystyrene, graphene, paraffin oil, lignin, ultraviolet absorbent, antifoaming agent and other materials into mixer, (ii) heating at 70-80 degrees C, then uniformly stirring for 45-60 minutes and naturally cooling to 30-40 degrees C, (iii) adding antioxidant and then uniformly stirring for 17-25 minutes to obtain mixed material, (iv) adding mixed material into the extruder, when heating, then the temperature reaches to 200-220 degrees C, extruding the mixed material, stretching and shaping, and (v) cooling by the cooling chamber, and then cutting to certain specification, and storing.