Skillnaderna mellan PE-rör och HDPE-rör

PE-rörpolyethylene-pipe are made of polyethylene plastic. Som den mest grundläggande typen av plast, Polyethylene has excellent resistance to most household and industrial chemicals. Common items like plastic bags and cling film are made of PE.

Polyethylene pipes can be generally classified into three types: lågdensitetspolyetenrör (LDPE-rör), rör av polyeten med medeldensitet (MDPE-rör), och högdensitetspolyetenrör (HDPE-rör).

jag. Low-Density Polyethylene (LDPE for short)

Low-density polyethylene is usually produced by high-pressure polymerization, with a density of 0.910-0.925g/cm³. The molecular structure of LDPE is a linear macromolecule with many side chains. The varying lengths of these side chains on the main chain affect the regularity of macromolecular arrangement, making the packing loose and hindering the crystallization of polyethylene. Därför, its crystallinity is only 55% – 65%. LDPE has a low melting point and is soft. De långa sidokedjorna ger den låg viskositet vid höga skjuvhastigheter under bearbetning och hög smälthållfasthet under sträckning, making it very suitable for blow molding processes. It is mainly used in the production of agricultural films and heavy packaging films.

II. Medium-Density Polyethylene (MDPE för kort)

Medium-density polyethylene is produced using efficient catalysts under medium and low pressure through copolymerization with α-olefins to control its density (0.926-0.940g/cm³), med en kristallinitet av 70%-80%. På grund av dess många och långa sidokedjor, the density and crystallinity decrease, giving MDPE better flexibility and low-temperature properties. Dock, its tensile strength, hårdhet, and heat resistance are inferior to those of high-density polyethylene. The copolymerization of olefins increases the interlamellar connection chains in the MDPE crystal, significantly improving its resistance to slow crack growth and long-term mechanical strength retention compared to LDPE. MDPE can be used in the production of pressure pipes, leveransrör, various containers, and packaging films.

III. Högdensitetspolyeten (HDPE för kort)

Högdensitetspolyeten (HDPE) is produced by low-pressure polymerization, presenting a linear structure with a density of 0.94-0.965g/cm³ and a crystallinity of 80%-95%, appearing as white powder or granules.

Compared to low-density polyethylene, HDPE has fewer side chains and is nearly linear in structure, with regular molecular arrangement and tight packing. Därför, it has a high crystallinity and density, with a relative molecular weight of hundreds of thousands to millions, och ett smalt område av smältflödeshastigheter. HDPE has high rigidity and toughness, excellent mechanical strength and heat resistance, as well as good resistance to deep agents and steam permeability. Among all types of polyethylene, HDPE has the lowest permeability and the strongest corrosion resistance, and also has good stiffness. It is mainly used in the production of various pressure pipes and injection-molded products.

Därför, HDPE pipes are a type of PE pipe, but compared to ordinary PE pipes, HDPE pipes have superior performance, which can be summarized as follows:

Different pressure-bearing capacity: HDPE pipes must withstand certain pressure, and usually require PE resins with high molecular weight and good mechanical properties, such as HDPE resins, which have a strength nine times that of ordinary polyethylene pipes (PE-rör).
Different wear resistance: Bland alla tekniska plaster, HDPE has the best wear resistance. Ju högre molekylvikt, the more wear-resistant the material becomes, even surpassing many metal materials (som kolstål, rostfritt stål, brons, etc.). The wear resistance of ordinary PE is only one-tenth that of HDPE.
Different applications: Allmänna PE-rör (rör av polyeten med medeldensitet) är lämpliga för transport av gasformig konstgjord gas, naturgas, and liquefied petroleum gas, while low-density polyethylene pipes are used as soft pipes. HDPE-rör (högdensitetspolyetenrör) används främst för transport av naturgas, municipal water supply systems, indoor water supply systems in buildings, outdoor buried water supply systems, and buried water supply systems in residential areas and factories, as well as for the repair of old pipelines, water treatment pipeline systems, och industriella vattenledningar i trädgårdar, bevattning, and other fields. HDPE pipes can be used as the successor to traditional steel pipes and polyvinyl chloride drinking water pipes, but ordinary PE pipes cannot.

Leverantör

Luoyang Datang Energy Tech Co.Ltd är en ledande kinesisk tillverkare som specialiserat sig på högkvalitativa plaströr och kopplingar. Utrustad med toppmoderna automatiserade produktionslinjer och stöds av ett team av 200 proffs, vi erbjuder ett omfattande produktsortiment som omfattar över 150 typer av plaströr och rördelar avsedda för vattenförsörjning och avloppssystem, gasöverföring, och golvvärmesystem. Våra huvudprodukter inkluderar PVC-rör och rördelar, PE (HDPE) Rör och kopplingar, PPR Rör och kopplingar, och PEX golvvärmerör.