Разликите между PE тръби и HDPE тръби

PE тръбиpolyethylene-pipe are made of polyethylene plastic. Като най-основен вид пластмаса, 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: полиетиленови тръби с ниска плътност (LDPE тръби), полиетиленови тръби със средна плътност (MDPE тръби), и полиетиленови тръби с висока плътност (HDPE тръби).

аз. 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. Следователно, its crystallinity is only 55% – 65%. LDPE has a low melting point and is soft. Дългите странични вериги му придават нисък вискозитет при високи скорости на срязване по време на обработка и висока якост на топене по време на разтягане, 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 за кратко)

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), с кристалност от 70%-80%. Благодарение на многобройните си и дълги странични вериги, the density and crystallinity decrease, giving MDPE better flexibility and low-temperature properties. Въпреки това, its tensile strength, твърдост, 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, тръби за доставка, various containers, and packaging films.

III. Полиетилен с висока плътност (HDPE за кратко)

Полиетилен с висока плътност (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. Следователно, it has a high crystallinity and density, with a relative molecular weight of hundreds of thousands to millions, и тесен диапазон от скорости на потока на стопилката. 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.

Следователно, 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:

1. 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 тръби).
2. Different wear resistance: Сред всички инженерни пластмаси, HDPE has the best wear resistance. Колкото по-високо е молекулното тегло, the more wear-resistant the material becomes, even surpassing many metal materials (като въглеродна стомана, неръждаема стомана, бронз, и т.н.). The wear resistance of ordinary PE is only one-tenth that of HDPE.
3. Different applications: Общи PE тръби (полиетиленови тръби със средна плътност) са подходящи за транспортиране на газообразен изкуствен газ, природен газ, and liquefied petroleum gas, while low-density polyethylene pipes are used as soft pipes. HDPE тръби (полиетиленови тръби с висока плътност) се използват главно за транспортиране на природен газ, 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, и промишлени водопроводни тръби в градините, напояване, 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.

Доставчик

Luoyang Datang Energy Tech Co.Ltd е водещ китайски производител, специализиран във висококачествени пластмасови тръби и фитинги. Оборудван с най-съвременни автоматизирани производствени линии и поддържан от екип от 200 професионалисти, предлагаме обширна продуктова линия, включваща над 150 видове пластмасови тръби и фитинги, предназначени за водоснабдителни и дренажни системи, пренос на газ, и системи за подово отопление. Нашите основни продукти включват PVC тръби и фитинги, PE (HDPE) Тръби и фитинги, PPR тръби и фитинги, и PEX тръби за подово отопление.