Production of Five-Layer Polyethylene Pipes Used in Water Transportation

Product Introduction:

Usually, the size distribution of molecules in a polyethylene polymer follows a bellshaped normal distribution curve described in the Gaussian probability theory. A polymer with a narrow molecular weight distribution curve has molecules that are almost identical to each other in terms of molecular weight. Such a polymer crystallizes at a faster and more uniform rate. The part resulting from this crystallinity does not warp much. A polymer that has chains varying in length from short to long has a wide molecular weight distribution. Resins with this type of molecular weight distribution have good resistance to slow crack growth, as well as good impact resistance and processability. When using polyethylene as the outer coating of gas pipes, several properties become important. Resins that have double-peaked molecular weight distribution, contain polyethylene molecules with very short and very long chains, and while maintaining good processability, have excellent physical properties in the resin.

Several layers of coating are applied to steel pipes to prevent corrosion, one of these layers is black polyethylene compound, which in addition to high MFI, should have high ESCR properties and good mechanical properties. For this purpose, double-peaked polyethylenes are used in foreign samples, where components with high molecular mass are responsible for more mechanical and environmental properties, and components with low molecular mass are responsible for easier processability. These polymers are synthesized in the reactor as two-peaked.

Technical Specifications:

This product is a combination of several polymers with various additives such as process aids, antioxidants and soot. The resulting sample should have good processability, proper adhesion and high mechanical properties. Also, the properties of ESCR (resistance to environmental stress), OIT resistance (resistance to oxidation) and proper distribution of soot are very important. Soot is prepared in the form of a masterbatch with the desired bases and is used in the desired compound. The percentage of soot in the final compound will be about 2.4%. The prepared masterbatch is 40%.