Extruding and forming method of polyethylene pipe for water supply

Abstract

The invention discloses an extruding and forming method of a polyethylene pipe for water supply. The extruding and forming method of the polyethylene pipe for water supply comprises the following steps: (1) vacuumizing high-density polyethylene resin and black master batch, and stirring and mixing at high speed uniformly by a high-speed mixing machine after vacuumizing treatment, wherein the moisture content of uniformly mixed materials is below 0.4%; (2) adding the uniformly mixed materials into a material cylinder of a screw extruder, conveying the materials to a material feeding section forward through the friction and shearing effects of the inner wall of the material cylinder and the surface of a screw under the screw rotation effect, changing the materials from the powdery solid into high-viscosity elastomers gradually through the compression, fusion and homogenization processes, extruding the high-viscosity elastomers through an opening die on a head of the screw extruder so as to acquire a pipe consistent with the opening die in shape at the extruding temperature of 110-130 DEG C; (3) cooling, and dragging; and (4) spraying a code, cutting, polishing and detecting, wherein the product up to the standard after checking is the polyethylene pipe for water supply. The extruding and forming method of the polyethylene pipe for water supply, which is provided by the invention, is rapid in extruding speed and is high in production efficiency; the prepared pipe is improved in abrasion resistance, is good in aging resistance, prolonged in the service life, and low in production cost.

Description

Technical field [0001] The invention relates to a pipe extrusion molding method, in particular to a polyethylene pipe extrusion molding method 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 . Therefore, a new polyethylene pipe for water supply is needed. Summary of the invention [0003] The purp...

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