High Density Polyethylene (HDPE), also known as low-pressure Polyethylene, is a kind of High crystallinity, non-polar surface shows a certain degree of translucent shape.PE has excellent resistance to most domestic and industrial chemicals.
HDPE is a high crystallinity, non – polar thermoplastic resin.High-density polyethylene (HDPE) is a kind of white powder granular product, non-toxic and tasteless, and its density ranges from 0.940 to 0.976 g/cm3.The crystallinity is 80%~90%, the softening point is 125~135℃, and the operating temperature is up to 100℃.The melting temperature is 120~160℃.It has good heat and cold resistance, good chemical stability, but also has higher rigidity and toughness, mechanical strength.Dielectric properties, environmental stress cracking resistance is also good.Hardness, tensile strength and creep property are better than low density polyethylene.Good wear resistance, electrical insulation, toughness and cold resistance. Good chemical stability, at room temperature, insoluble in any organic solvents, acid, alkali and various salts corrosion resistance.
The appearance of the original HDPE is milky white, in the thin section of a certain degree of translucent.PE has excellent resistance to most domestic and industrial chemicals.Certain types of chemicals produce chemical corrosion, such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene), and halogenated hydrocarbons (carbon tetrachloride).The polymer is non – hygroscopic and has good water – proof vapor property and can be used for packaging purposes.HDPE has very good electrical performance, especially high dielectric strength of insulation, making it very suitable for wire and cable.Medium to high molecular weight classes offer excellent impact resistance at room temperature and even -40F low temperatures.Unique to each grade of HDPE is the appropriate combination of four basic variables: density, molecular weight, molecular weight distribution, and additive.Different catalysts are used to produce customized polymers with special properties.These variables combine to produce HDPE grades for different USES;Achieve the best balance in terms of performance.
PE is the most common production method through slurry or gas additive method, there are a few with solution phase processing production.All these processes involve exothermic reactions involving ethylene monomers, A-alkene monomers, catalyst systems (which may be more than one compound), and various types of hydrocarbon diluents.Hydrogen and some catalysts are used to control the molecular weight.Slurry reactors are generally stirrer reactors or a more commonly used type of large annular reactor in which slurry can be cyclically stirred.Polyvinyl particles are formed when ethylene and comonomers (as needed) come into contact with the catalyst.After the diluent is removed, the polyethylene or powder particles are dried and the dosage of additives is added to produce the granule.Modern production lines for large scale reactors with twin screw extruders can produce more than 40000 pounds per hour.The development of new catalysts contributes to the improvement of the performance of the new grade HDPE.Two of the most commonly used catalyst types are Phillip’s chromium oxide-based catalyst and the titanium compound alkyl aluminum catalyst.The HDPE produced by Philips catalyst has medium width molecular weight distribution.The molecular weight distribution of titanium-alkyl aluminum catalyst is narrow.Catalysts used to produce narrow MDW polymers in a compound reactor can also be used to produce wide MDW grades.For example, two series reactors producing products with significantly different molecular weights can produce a bimodal molecular weight polymer with a full wide molecular weight distribution.
The addition of antioxidants can prevent the polymer from degrading during processing and prevent the oxidation of the finished product during use.Antistatic additives are used in many packaging grades to reduce the adhesion of bottles or packages to dust and dirt.Specific USES require special additive formulations, such as copper inhibitors associated with wire and cable USES.Excellent weather resistance and UV (or daylight) resistance can be achieved by adding anti-UV additives.No ANTI-UV or carbon black PE has been added. It is recommended not to use outdoors continuously.The high grade carbon black pigment provides excellent UV resistance and is often used in outdoor applications such as wire, cable, tank beds or pipes.
PE can be manufactured by a wide range of different processing methods.With ethylene as the main raw material, propylene, 1-butene, hexene as the copolymer, under the action of catalyst, using slurry polymerization or gas polymerization process, the polymer obtained by flash evaporation, separation, drying, granulation and other procedures, to obtain uniform particles of the finished product.These include such products as sheet extrusion, film extrusion, pipe or profile extrusion, blow molding, injection molding, and roll molding.HDPE is suitable for all kinds of molding processes of thermoplastic molding, with good molding processing, such as injection molding, extrusion molding, blow molding, rotary molding, coating, foaming process, hot forming, hot sealing welding, hot welding and so on.
Injection molded products: containers, caps, buckets, caps, food containers, dishes, trash cans, boxes, and plastic flowers.
Blow molding products: hollow molding products, such as various series of blow molding barrels, containers, bottles, containers for cleaning agents, chemicals, cosmetics, gasoline tanks, daily necessities, etc.There are also blown film products such as food packaging bags, grocery shopping bags, fertilizer lining film and so on.
Extruded products: pipes and fittings are mainly used in gas transportation, public water transportation and chemical transportation, such as building materials drain pipes, gas pipes, hot water pipes, etc. Sheet materials are mainly used for seats, suitcases, handling containers, etc.
Rotary molding: injection molding products such as large containers, storage tanks, barrels, boxes, etc.
Polyethylene granules can be processed into film, wire and cable sheath, pipe, all kinds of hollow products, injection products, fiber, etc.Widely used in agriculture, packaging, electrical and electronic, machinery, automobiles, daily necessities and other aspects.
IMRI supplies all kinds of PE and PP granules such as HDPE granules,MDPE granules,LDPE granules,LLDPE granules,HDPP granules,MDPP granules,LDPP granules,etc.Please contact us to get a quotation if you need any kind of them.