PEパイプとHDPEパイプの違い

PEパイプpolyethylene-pipe are made of polyethylene plastic. 最も基本的なプラスチックとして, 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: 低密度ポリエチレンパイプ (LDPEパイプ), 中密度ポリエチレンパイプ (MDPEパイプ), 高密度ポリエチレンパイプ (HDPEパイプ).

私. 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. したがって, its crystallinity is only 55% – 65%. LDPE has a low melting point and is soft. 長い側鎖により、加工中の高せん断速度での粘度が低く、延伸中に高い溶融強度が得られます。, 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 (略して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), の結晶化度を持つ 70%-80%. 側鎖が多く長いため、, the density and crystallinity decrease, giving MDPE better flexibility and low-temperature properties. しかし, its tensile strength, 硬度, 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, デリバリーパイプ, various containers, and packaging films.

III. 高密度ポリエチレン (HDPEの略称)

高密度ポリエチレン (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. したがって, it has a high crystallinity and density, with a relative molecular weight of hundreds of thousands to millions, 狭い範囲のメルトフローレート. 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.

したがって, 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パイプ).
Different wear resistance: エンジニアリングプラスチックの中でも, HDPE has the best wear resistance. 分子量が大きいほど, the more wear-resistant the material becomes, even surpassing many metal materials (炭素鋼など, ステンレス鋼, ブロンズ, 等). The wear resistance of ordinary PE is only one-tenth that of HDPE.
Different applications: 一般PE管 (中密度ポリエチレンパイプ) ガス状の人工ガスの輸送に適しています, 天然ガス, and liquefied petroleum gas, while low-density polyethylene pipes are used as soft pipes. HDPEパイプ (高密度ポリエチレンパイプ) 主に天然ガスの輸送に使用されます, 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, 庭の工業用水道管, 灌漑, 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.

サプライヤー

Luoyang Datang Energy Tech Co.Ltd 高品質のプラスチックパイプと継手を専門とする中国の大手メーカーです. 最先端の自動生産ラインを備え、チームによってサポートされています。 200 専門家, 私たちは以上を含む広範な製品ラインを提供しています 150 給水および排水システム用に設計されたプラスチック製のパイプおよび継手の種類, ガストランスミッション, および床暖房システム. 当社の主力製品には塩ビ管および継手などがあります。, PE (HDPE) パイプと継手, PPR パイプおよび継手, およびPEX床暖房パイプ.