PE Lay Flat Hose Classified by density
PE is polyethylene. HDPE is a high-density polyethylene, also known as low-pressure polyethylene. LDPE for low-density polyethylene, also known as high-pressure polyethylene.
HDPE and LDPE are PE.
Polyethylene mainly by density classification, nature due to varieties, grades vary:
① high-density polyethylene (HDPE): is opaque white powder, granulated for the milky white particles, the molecular structure of the linear, very few branches of the phenomenon, is a typical crystalline polymer. Mechanical properties are better than low-density polyethylene, melting point higher than the low-density polyethylene, about 126 ~ 136 ℃, the embrittlement temperature is lower than the low-density polyethylene, about -100 ~ -140 ℃.
② low density polyethylene (LDPE): is colorless, translucent particles, molecules have long branches, intermolecular arrangement is not close.
③ linear low-density polyethylene (LLDPE): the molecule is generally only a short branch of the existence of mechanical properties between high-density and low-density polyethylene between the melting point than ordinary low-density polyethylene 15 ℃, low temperature performance But also better than low-density polyethylene, resistant to environmental stress cracking than ordinary low-density polyethylene several times higher.
In addition, according to the production method can be divided into low pressure polyethylene, medium pressure polyethylene and high pressure polyethylene, polyethylene production methods are different, its density and melt index (that liquidity) are also different. Density and melt flow rate (MFR) are also key indicators for identifying and distinguishing between different varieties and grades of polyethylene.
Processing and application can be blow molding, extrusion, injection molding and other methods of processing, widely used in the manufacture of film, hollow products, fiber and daily sundry goods. In the actual production, in order to improve the stability of polyethylene and oxidation and improve the processing and use of performance, need to add a small amount of plastic additives. Commonly used UV absorbers are o-hydroxybenzophenone or its alkoxy derivatives, etc. Carbon black is an excellent UV shielding agent. In addition, the addition of antioxidants, lubricants, colorants, etc., so that the scope of application of polyethylene more expanded.
Thin film of low-density polyethylene produced by more than half of the blown film, this film has good transparency and a certain degree of tensile strength, widely used in a variety of food, clothing, medicine, fertilizer, industrial packaging materials As well as agricultural film. Can also be used to process into a composite film extrusion method for packaging heavy objects. Since 1975, high-density polyethylene film has also been developed, its high strength, low temperature, moisture, and have good printability and machinability. The use of linear low-density polyethylene is also made of thin film, its strength, toughness are better than low-density polyethylene, puncture resistance and rigidity is also good, poor transparency is still slightly better than high-density polyethylene The In addition, can also be in paper, aluminum foil or other plastic film extrusion coating polyethylene coating, made of polymer composite materials.
Hollow products of high density polyethylene high strength, suitable for hollow products. Can be made by blow molding bottles, barrels, cans, tanks and other containers, or by casting method into the tank tank and tank and other large containers.
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