▎ 摘　　要

NOVELTY - Weather-resistant drainage pipeline with multilayer structure, comprises an inner layer, an intermediate layer and an outer layer, where the intermediate layer pipe comprises 100 pts. wt. PVC resin, 5-30 pts. wt. calcium carbonate powder, 3-6 pts. wt. calcium-zinc heat stabilizer, 1-3 pts. wt. solid plasticizer, 0.5-4 pts. wt. processing aid, 0.7-1.5 pts. wt. lubricant, 4-13 pts. wt. toughening modifier, 3-6 pts. wt. ultraviolet screening agent and 1-3 pts. wt. light stabilizer, where in addition to the raw material components of the intermediate layer pipe, the outer layer pipe further includes 3-6 pts. wt. barrier agent. USE - Used as weather-resistant drainage pipeline with multilayer structure. ADVANTAGE - The drainage pipeline: is environmentally friendly; has no lead, has high toughness, strength and excellent UV shielding effect aging resistance, reduce the photo-catalytic oxidation reaction and ensure the stable and long-term use effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the weather-resistant drainage pipeline with multilayer structure, comprising (i) adding the inner layer pipe raw material, middle layer pipe raw material and outer layer pipe raw material into respective high-speed mixers to carry out high-speed stirring to obtain a pre-mixture, taking out the pre-mixture after stirring, placing the pre-mixture in a cold mixing pot to carry out low-speed cold mixing to a specific temperature, and respectively taking the pre-mixture as inner layer pipe formula, middle layer pipe formula and an outer layer pipe formula, and (ii) extruding the inner layer pipe formula, middle layer pipe formula and outer layer pipe formula using double-screw extruder and extruding by a multilayer co-extrusion die head to obtain a multilayer pipe, cooling, shaping, drawing and cutting to obtain a finished product.