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

A pressure-resistant and high-performance technology, which is applied in the field of high-density polyethylene (HDPE) water supply pipes, can solve the problems of decreased transverse strength, reduced transverse physical and mechanical properties of pipes, weakened connection force, etc., and achieves internal and external quality improvement and excellent physical and mechanical properties , the effect of excellent processability

Inactive Publication Date: 2013-10-02
林品榕
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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

Method used

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Embodiment Construction

[0031] In order to describe in detail the technical content, structural features, achieved objectives and effects of the present invention, the following will be described in detail in conjunction with the embodiments.

[0032] mPE (metallocene polyethylene) : It is the most important technical progress of the polyolefin industry in the 1990s and an important innovation after the LLDPE production technology. Because it is polyethylene produced by using metallocene (MAO) as a polymerization catalyst, its performance is significantly different from that of PE polymerized by traditional Ziegler-Natta catalysts. mPE (metallocene polyethylene) uses transition metal catalysts as oligomerization catalysts and metallocene catalysts as copolymerization catalysts to form a dual-functional catalytic system. With ethylene as the only monomer, high-performance branched polyethylene is synthesized in one step in the same reactor. Polyethylene resin products. Compared with ordinary LLDPE, ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06F16L9/12
Inventor 林品榕阙文豪
Owner 林品榕
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