A kind of high-density polyethylene microporous foam pipe and its preparation method

Abstract

The invention relates to a high-density polyethylene microporous foamed tube and a preparation method thereof, belonging to the technical field of tube preparation. The high-density polyethylene microporous foamed tube is prepared by mixing and extruding the following components in parts by weight: 100 parts of high-density polyethylene, 5-10 parts of linear low-density polyethylene, 1-8 parts of main foaming agent, 0.5-4 parts of auxiliary foaming agent, 0.5-4 parts of foaming assistant, 1-5 parts of nucleating agent, 0.1-0.5 part of coupling agent, 0.2-1 part of dispersing agent and 0.5-2 parts of antioxidant. By addopting the composite foaming system, the heat absorption-release balance is achieved in the extrusion process, the technique is stable, and the obtained microporous foamed tube has favorable mechanical properties and is suitable for low-pressure water supply and rigid load bearing; and the preparation process is highly continuous, stable, safe and pollution-free, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of pipe preparation, and in particular relates to a high-density polyethylene microporous foam pipe and a preparation method thereof. Background technique [0002] The foaming technology of polyethylene has been greatly developed in recent years, and its foamed products have the advantages of light weight, corrosion resistance, heat insulation, and insulation. Low-density polyethylene has good foaming performance, and the expansion ratio can reach 45 times, and it is widely used in heat preservation and packaging materials. Compared with low-density polyethylene, high-density polyethylene has poor foaming performance, but high-density polyethylene foam products have better strength, rigidity, and heat resistance, and can be used to produce some low-pressure water supply and exterior products. Sheath tubing. [0003] However, usually high-density polyethylene foam cells are relatively large, resulting in a ...

AI Technical Summary

Problems solved by technology

From the process selection of polyethylene microcellular foaming, physical foaming requires special equipment for transporting physical foaming agents, or a very cumbersome process is added, and the cost is high

The chemical microcellular foaming equipment is simple, but the heat absorption and release during the foaming process is not conducive to the stability of extrusion processing, which will cause uneven cell size and unstable performance.

In addition, the extrusion process of polyethylene pipes is complicated and the process control is difficult. At present, there are few research reports on the application of chemical microcellular foaming technology on polyethylene pipes.