Low-density anti-impact modified polyvinyl chloride pipe and production process thereof

Abstract

The invention discloses a low-density anti-impact modified polyvinyl chloride pipe, which is produced from the following components in parts by weight: 100 parts of polyvinyl chloride resin, 0.4 to 4.0 parts of stabilizer, 2 to 8 parts of flexibilizer, 2 to 8 parts of rigid particles, 0.5 to 3.0 parts of processing agent, 1.1 to 2.5 parts of lubricant, 0.05 to 0.5 parts of antioxidant, 0.03 to 3 parts of colorant and 0 to 5 parts of filling agent. A production process of the low-density anti-impact modified polyvinyl chloride pipe is as follows: all the components are uniformly mixed in a high-speed mixer, a pipe is extruded out by a double-main unit single-screw extruder after uniform mixing in the cold mixer, and after vacuum sizing and cooling formation, the pipe is cut according to fixed length and packaged. Because the flexibilizer and rigid particle synergistic toughening method is used by the anti-impact modified polyvinyl chloride pipe disclosed by the invention, the problem that rigidity-toughness balance of the PVC pipes is hard to realize is solved, and thereby the toughness of the pipe is notably increased while the pipe keeps the rigidity of hard PVC pipes.

Description

Technical field [0001] The invention relates to a low-density impact-resistant modified polyvinyl chloride pipe and its production process, belonging to the technical field of polyvinyl chloride (PVC) water supply pipes. Background technique [0002] In the water supply system, plastic pipes have the characteristics of non-corrosion, good hygienic performance, and easy installation. They have been vigorously promoted in my country. It is a general trend to replace traditional galvanized iron pipes. Plastic water supply pipes mainly include: PVC, polyethylene (PE), polypropylene (PP), etc. Compared with other polyolefin pipes, PVC pipes have high strength, good flame retardancy, high ring stiffness, and excellent weather resistance. The advantages of low performance and low price have been widely used. [0003] It is a recognized fact that PVC pipes have poor toughness at low temperatures, which are mainly manifested in: brittle failure occurs during transportation, installation an...

AI Technical Summary

Problems solved by technology

Therefore, domestic and foreign countries have successively developed high-impact PVC pipes, mainly using elastomers for toughening, and the most widely used is chlorinated polyethylene (CPE). This method can improve the toughness of PVC pipes, but the amount of CPE added Larger, due to the network toughening mechanism of CPE, the processing conditions are relatively harsh, and it is difficult to achieve a rigid-tough balance

Although this kind of pipe has been promoted to a certain extent, its impact resistance at low temperature (-10°C) is still poor. At the same time, the existing pipe has high density, short pressure resistance time, and high production cost.

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