Special polyethylene material for 3PE corrosion prevention and preparation method thereof

Abstract

The invention relates to a special polyethylene material for 3PE (3-layer polyethylene) corrosion prevention and a preparation method thereof. The method includes: mixing 50-70 parts of hexene-1 copolymerization and bimodal molecular weight distribution resin A special for high density polyethylene tubes, 30-50 parts of linear low density polyethylene B, 5-8 parts of carbon black masterbatch C that contains a phenolic composite antioxidant system and is special for corrosion prevention evenly through a mixer, and then performing extruder granulation and homogenizing, thus obtaining the special polyethylene material product for 3PE corrosion prevention. The finally obtained grain product has a melt flow rate of 0.15-0.50g / 10min (190DEG C, 2.16kg loading test), the oxidation induction time is more than 30min (220DEG C test), the processing performance is excellent in a steel tube coating process, during lateral winding extrusion coating, the membrane sheet has stable width, and the apparent quality is good.

Description

Technical field [0001] The invention relates to a special polyethylene material for 3PE anticorrosion and a preparation method thereof, belonging to the field of synthetic resins. Background technique [0002] Among various pipeline anticorrosion technologies, the three-layer structure polyethylene anticorrosion technology (hereinafter referred to as 3PE) is the most important one, and the special polyethylene anticorrosion material is an important raw material that must be used in 3PE technology. Compared with traditional materials, polyethylene anti-corrosion special material has the advantages of good heat preservation effect, long life, good anti-corrosion effect and convenient construction. [0003] Three-layer structure polyethylene (3PE) anti-corrosion technology was successfully developed by Germany Mannesmann and BASF Chemical Industries in the early 1980s. The anti-corrosion layer is composed of fused epoxy powder (FBE) and extruded polyolefin. The performance advantage ...

AI Technical Summary

Problems solved by technology

[0004] 3PE anti-corrosion polyethylene special material mainly achieves the purpose of anti-corrosion by extruding the film and coating it on the surface of the metal pipe. Therefore, an appropriate melt flow rate (MFR) is required to ensure the processing performance and the stability of the film width Generally, the MFR of raw materials is required to be 0.15-0.50g / 10min (190°C, 2.16kg load). At the same time, the use environment after pipeline corrosion requires 3PE anti-corrosion polyethylene special materials to ensure high mechanical strength such as tensile strength , resistance to environmental stress cracking, Vicat softening point, indentation hardness and other indicators, but also has excellent resistance to thermal oxygen aging (OIT at 220°C ≥ 30min; 100°C, 4800h thermal aging MFR change rate ≤ 35 %), therefore, ordinary polyethylene raw materials cannot meet the 3PE anti-corrosion requirements

Images