Application of mPE (metallocene polyethylene) in improving pressure resistance of HDPE (high density polyethylene) tube as well as HDPE tube and preparation method thereof

Abstract

The invention discloses an application of mPE (metallocene polyethylene) in improving pressure resistance of an HDPE (high density polyethylene) tube. During the production of the HDPE tube, the mPE is added as a raw material, and the mPE, the main raw material namely HDPE and a pigment are subjected to processes of stirring, mold blank extruding, cooling, shaping, hauling and cutting to manufacture the HDPE tube. The invention simultaneously discloses the HDPE tube and a preparation method thereof. The invention has the beneficial effects that in an HDPE system, after the mPE is added, the HDPE tube has excellent physical and mechanical properties and very good molding performance because of abundant branched chain structures of the mPE. Moreover, due to the excellent processability of the mPE, the flow property of the HDPE during the production of the tube can be improved and then the appearance quality of the tube is improved, so that the internal and external quality of the tube is integrally improved.

Description

technical field [0001] The invention relates to the production of high-density polyethylene (HDPE) water supply pipes, pipe fittings and high-density polyethylene HDPE gas pipes and pipe fittings, and can also be applied to film products, hollow products, sheets, injection molding products, molded Plastic products, extruded products, etc. Background technique [0002] High Density Polyethylene (HDPE for short) is a non-polar thermoplastic resin with high crystallinity. The basic structure is -(CH 2 -CH 2 )-n (single strand, no cross-linking). High-density polyethylene is usually produced by the Ziegler-Natta (Ziegler-Natta catalyst) polymerization method, which is characterized by no branched chains on the molecular chain, so the molecular chains are regularly arranged and have a high density. [0003] HDPE pipe is made of HDPE (high-density polyethylene) as the main raw material, matched with corresponding pigments, and manufactured through stirring, extrusion of pariso...

AI Technical Summary

Problems solved by technology

[0005] Disadvantage 1: process formula

[0007] Disadvantage 2: Forming method

At this time, the longitudinal strength of the pipe is strengthened due to the orientation of the molecular chain, but because the molecules themselves have no branched chains, after the molecules are aligned in the longitudinal direction, the originally curved molecular chains are straightened out, and the corresponding transverse connection force is weakened, so that The transverse strength is greatly reduced, thereby greatly reducing the transverse physical and mechanical properties of the pipe