Method for molding low-temperature-resistant high-strength polyethylene pipe applied to water supply

Abstract

The invention provides a method for molding a low-temperature-resistant high-strength polyethylene pipe applied to water supply. The method comprises the following steps: (1) preparing raw materials consisting of, by weight, 100 parts of polyethylene, 20 to 30 parts of polyolefin, 10 to 20 parts of CPVC resin, 1 to 5 parts of polyvinyl chloride resin, 1 to 3 parts of barium laurate, 1 to 2 parts of ACR-201, 5 to 10 parts of titanium dioxide, 1 to 3 parts of talcum powder and 1 to 2 parts of an anti-oxidant; (2) subjecting polyethylene, polyolefin, CPVC resin and polyvinyl chloride resin to vacuum-pumping; (3) adding polyethylene and polyolefin into a mixing pot at a low rotation speed, starting high-speed mixing, adding the CPVC resin polyvinyl chloride resin into the mixing pot at 70 DEGC, adding barium laurate at 80 DEG C, adding ACR-201, titanium dioxide and talcum powder at 110 DEG C; and (4) carrying out extruding via a conical twin-screw extruder so as to form a pipe, and afterextrusion, carrying out vacuum sizing and cooling so as to obtain the low-temperature-resistant high-strength polyethylene pipe. The method of the invention has the advantages of high extrusion speedand high production efficiency; and the prepared pipe is remarkably improved in strength, low temperature resistance and other performance.

Description

Technical field [0001] The invention relates to a pipe extrusion molding method, in particular to a molding method of a low-temperature high-strength polyethylene pipe for water supply. Background technique [0002] Internationally, polyethylene pipes have been used as pressure pipes for 50 years. Many countries have been applied in water and gas pipelines. In my country, since the National Bureau of Quality and Technical Supervision issued the national standard (GB / T13663-2000) for Polyethylene (PE) Pipes for Water Supply on November 21, 2000, it has promoted the production and application of polyethylene water supply pipes in China. However, in the existing polyethylene pipes for water supply, the black masterbatch has a large particle size, poor dispersion, and poor pipe surface smoothness. Undispersed carbon black agglomerates in the pipe wall may cause premature rupture of the pressure pipe . [0003] Therefore, a new polyethylene pipe for water supply is needed. Summary o...

AI Technical Summary

Problems solved by technology

However, in the existing polyethylene pipes for water supply, the particle size of the black masterbatch is large, the dispersibility is poor, the smoothness of the pipe surface is poor, and the undispersed carbon black agglomerates existing in the pipe wall may cause premature rupture of the pressure pipe