Rozdiely medzi PE rúrami a HDPE rúrami

PE potrubiapolyethylene-pipe are made of polyethylene plastic. Ako najzákladnejší druh plastu, Polyetylén má vynikajúcu odolnosť voči väčšine domácich a priemyselných chemikálií. Common items like plastic bags and cling film are made of PE.

Polyethylene pipes can be generally classified into three types: polyetylénové rúry s nízkou hustotou (LDPE potrubia), polyetylénové rúry strednej hustoty (MDPE rúrky), a polyetylénové rúry s vysokou hustotou (HDPE rúry).

ja. 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. Preto, its crystallinity is only 55% – 65%. LDPE has a low melting point and is soft. Dlhé bočné reťazce mu dávajú nízku viskozitu pri vysokých šmykových rýchlostiach počas spracovania a vysokú pevnosť taveniny počas naťahovania, 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 (skratka MDPE)

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), s kryštalinitou 70%-80%. Kvôli jeho početným a dlhým bočným reťazcom, the density and crystallinity decrease, giving MDPE better flexibility and low-temperature properties. Avšak, its tensile strength, tvrdosť, 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, dodávacie potrubia, various containers, and packaging films.

III. Polyetylén s vysokou hustotou (skratka HDPE)

Polyetylén s vysokou hustotou (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. Preto, it has a high crystallinity and density, with a relative molecular weight of hundreds of thousands to millions, a úzky rozsah rýchlostí toku taveniny. 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.

Preto, 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 potrubia).
2. Different wear resistance: Medzi všetkými technickými plastmi, HDPE has the best wear resistance. Čím vyššia je molekulová hmotnosť, the more wear-resistant the material becomes, even surpassing many metal materials (ako je uhlíková oceľ, nehrdzavejúca oceľ, bronz, atď.). The wear resistance of ordinary PE is only one-tenth that of HDPE.
3. Different applications: Všeobecné PE rúry (polyetylénové rúry strednej hustoty) sú vhodné na prepravu plynného umelého plynu, zemný plyn, and liquefied petroleum gas, while low-density polyethylene pipes are used as soft pipes. HDPE rúry (polyetylénové rúry s vysokou hustotou) sa používajú najmä na prepravu zemného plynu, 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, a priemyselné vodovodné potrubia v záhradách, zavlažovanie, 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.

dodávateľa

Luoyang Datang Energy Tech Co.Ltd je popredný čínsky výrobca špecializujúci sa na vysokokvalitné plastové rúry a tvarovky. Vybavené najmodernejšími automatizovanými výrobnými linkami a podporované tímom 200 profesionálov, ponúkame rozsiahlu produktovú radu zahŕňajúcu viac ako 150 typy plastových rúr a tvaroviek určených pre vodovodné a kanalizačné systémy, prenos plynu, a systémy podlahového vykurovania. Medzi naše hlavné produkty patria PVC rúry a tvarovky, PE (HDPE) Rúry a tvarovky, Rúry a tvarovky PPR, a PEX potrubia podlahového kúrenia.