LDPE is non-toxic, tasteless, odorless, and has a density of 0.910 ~ 0.940g/cm3. It is polymerized with oxygen or organic peroxide as a catalyst under high pressure of 100 ~ 300MPa, also known as high-pressure polyethylene.
Chemistry and properties：Ethylene is the basic structural unit of polyethylene products. It is a colorless gas obtained from refinery gas, liquefied petroleum gas, or liquid hydrocarbons.
Production methodprocess：Conventional LDPE can be produced by two methods: the tube method or the kettle method. In both processes, high purity ethylene is fed into a reactor containing an initiator at high pressure (103 to 276MPa) and high temperature (300 to 500F). The initiator is either oxygen or an organic peroxide. Reaction termination is achieved either by adding a chain terminator or by linking two molecular chains.
Process: The LDPE grade can meet the requirements of most thermoplastic processing technologies. Including: film blowing, film casting, extrusion adhesive, wire and cable adhesive, injection molding, blow molding.
Apply: Application LDPE can be used alone or in combination with other members of the polyethylene family.
Widely used in packaging. Construction, agriculture, industry and consumer markets. Extrude the film. The largest market for LDPE is the production of thin films (< 12 millihours).
Single and composite LDPE films produced by blow molding or casting processes account for more than 55% of the total domestic consumption of LDPE. LDPE films show good optical properties, strength, flexural properties, sealing properties, slow odor diffusion and chemical stability.
LDPE is used to package bread, agricultural products, fast food, textiles, durable consumer goods and some industrial products.
LDPE can also be used as a non-packaging film, such as disposable diapers, agricultural film and shrink film.
Extrusion adhesive: Adhesives provide a protective layer that helps seal finished packaging, essential for excellent tensile properties, long lasting coverage and low odor spread. Typical melting index ranges from 3 to 15 g / 1O min.
LDPE adhesive can be coated on many substrates, such as paper, board, cloth and other polymer materials.
LDPE adhesive is an economical and effective means to ensure the thermal sealing and moisture resistance of the matrix. Markets that use LDPE adhesives include milk boxes, aseptic preservative packaging, and food packaging. Duct tape and paper products.
Molding: LDPE resin is used in molding due to its flexural resistance and processing properties.
The melting index of the resin ranges from 0.5-2.0 g / 10 min, and the density varies from 0.918 g/m3 to 0.922 g/cm. LDPE molding is used in the manufacture of medical and consumer bottles and seals that require extrusion properties.
Wire and cable: Wire and cable LDPE was originally used as wire and cable covering material.
LDPE shows excellent electrical properties and wear resistance, which are strictly required in the market. The melting index of the resin ranges from 0.25-2.0 g / 10 min and the density is 0.918 g/m3 to 0.932 g/cm. Today, LDPE resin is used as the outer skin of telecommunications cables.
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