Polypropylene resin composition and production process for large-caliber wall tube with hot-state winding structure

Abstract

The invention discloses a polypropylene resin composition. The polypropylene resin composition comprises the following components in parts by weight: 75 to 85 parts of block polymerization polypropylene, 15 to 25 parts of reinforced modified master batch, 1 to 2 parts of a processing modifier, 3 to 8 parts of an anti-impaction modified material, and 0 to 2 parts of color concentrate. The invention also discloses a production process for a large-caliber wall tube with a hot-state winding structure. The production process comprises the following steps of: (1) blending and mixing the materials; (2) drying and preheating: drying and preheating the polypropylene resin composition by using hot blast; (3) performing plasticization and extrusion and molding by winding: plasticizing and extruding the polypropylene resin composition which is obtained in step (2), and performing hot-state winding on the extruded molten-state plastic to form a tubular product; (4) molding by cooling; (5) leveling by cutting; and (6) demolding: demolding the tubular product from a hot-state winding forming mold. The large-caliber hot-state winding structure wall tube produced from the polypropylene resin composition has high mechanical property, chemical corrosion resistance, high temperature resistance and long service life.

Description

technical field [0001] The invention relates to a plastic composition, in particular to a high-strength modified polypropylene resin composition and a production process for using the polypropylene resin composition to make a large-caliber thermal winding structure wall pipe. Background technique [0002] Due to the requirements for environment, energy and sanitation performance, it has become a consensus to replace traditional pipes with plastic pipes. The pipe practice of developed countries shows that polyolefin pipes will gradually dominate in the future, especially in large-diameter solid-wall pipes and structures. wall pipe system. In traditional plastic drainage pipes, the plastics used to make the pipes mainly include polyvinyl chloride and polyethylene. However, high-density polyethylene (HDPE) materials still have technical limitations when used in chemical industry drainage and sewage piping systems under high temperature and pressure, so polypropylene is the mat...

AI Technical Summary

Problems solved by technology

[0003]At present, high-density polyethylene is used as the main material, and the thermal winding process is used to produce structural wall pipes. The pipe diameter can reach 300-4000 mm, but this The ring stiffness of the structural wall pipe produced by this process is not high. For example, when the diameter of the pipe is ≥ 1800 mm, it is difficult to achieve the ring stiffness exceeding SN8 and consumes a lot of raw materials, and its manufacturing cost is very high.

At present, there are also a small number of sewage and drainage pipes in China that use polypropylene as the main material, such as polypropylene double-wall corrugated pipes, but due to the limitation of production equipment, the maximum diameter of the pipe can only be 1800mm

In recent years, the high-density polyethylene used in the pressure pipe field has gradually improved, but the new PE80 and PE100 have no obvious advantages for high ring stiffness pipes