Impact-resistant modified polyvinyl chloride tube material and preparation process thereof

The invention discloses an impact-resistant modified polyvinyl chloride tube material, which is prepared from the following components in part by weight: 100 parts of polyvinyl chloride resin, 0.4 to 4.0 parts of stabilizing agent, 2 to 8 parts of toughening agent, 2 to 8 parts of rigid particles, 0.5 to 3.0 parts of processing aid, 1.1 to 2.5 parts of lubricant, 0.05 to 0.5 part of antioxidant, 0.03 to 3 parts of coloring agent and 0 to 5 parts of filling agent. A preparation process for the tube material comprises the following steps: mixing the components uniformly in a high-speed mixer, extruding the mixture to form the tube material by using a double-host single-screw extruder after the components are mixed uniformly in a cooling mixer, and modularizing, vacuuming and cooling-molding the tube material; and cutting and packing the tube material with fixed length. The impact-resistant modified polyvinyl chloride tube material uses a method of cooperative toughening of the toughening agent and the rigid particles, and solves the problem that the impact-resistant PVC tube material difficultly realizes rigidity balance so that the toughness of the tube material is obviously improved while the rigidity of the hard PVC tube material is kept.