Polyethylene (PE) is classified as a “thermoplastic”. A major useful attribute about thermoplastics is that they can be heated to their melting point, cooled, and reheated again without significant degradation. Instead of burning, thermoplastics like polyethylene liquefy, which allows them to be easily molded and then subsequently recycled. By contrast, thermoset plastics can only be heated once.
Different types of polyethylene exhibit wide variability in their crystalline structures. The less crystalline a plastic is (i.e. the more amorphous a plastic is), the more it demonstrates a tendency to gradually soften (i.e. they have a wider range between their glass transition temperature and their melting point). Polyethylene is a homopolymer in that it is composed of a single monomer constituent which is H2C=CH2 in ethylene.
Polyethylene has an extremely large range of applications depending on the particular type. It is one of the most widely produced plastics in the world. Polyethylene is commonly categorized into one of several major compounds of which the most common include LDPE, LLDPE and HDPE. High Density Polyethylene (HDPE) is a strong, high density, moderately stiff plastic with a highly crystalline structure. It is frequently used as a plastic for milk cartons, laundry detergent, garbage bins, and cutting boards
High density Polyethylene can be produced by three types of processes using Ziegler-Natta or Phillips-Type Catalyst:
1. Slurry Process:
The catalyst is diluted with any liquid hydrocarbon (e.g. hexane). A mixture of ethylene and hydrogen is passed under pressure through this slurry, after which the monomer (ethene) is polymerized to form polyethylene. The polymer-solvent slurry is evaporated to remove the solvent. Water vapour and nitrogen is then passed through the separated polymer to destroy the active sites of the catalyst, thus leaving behind HDPE.
2. Solution Process:
A mixture of ethylene and hydrogen is passed through a solution containing the Zieglar catalyst and liquid hydrocarbon under pressure. The remaining procedure is similar to the slurry process.
3. Gas Phase Process:
In a fixed bed reactor, a hydrogen and ethylene mixture is passed through a Phillips-Type catalyst. Ethylene, which is suspended in the gas, will polymerise to form HDPE. The polymer powder obtained is separated and shaped as required.
HDPE is used for making bags, storage bottles, tanks, etc due to its high stiffness property. Most of the bottles are made using the process of blow molding process.
HDPE is used for making pipes for gas/liquid/sewage industries due to its chemical inertness, corrosion resistance, light weight (compared to metal pipes), and high strength properties.
HDPE is used to make mortars for the pyrotechnic system, and is a replacement for PVC/steel mortars, because it is much safer.
Tradeasia is fulfilling the needs of many international and national companies by offering premium quality raw compounds, which is prepared by professionals. We are a leading Polyethylene Supplier in Singapore, India, Indonesia, Mauritius & Vietnam that serve the purpose of many of our clients, at budget-friendly rates. Paired up with our comprehensive supply capability, We are one of the best Polyethylene Suppliers based in South East Asia. We tend to make sure that the desired product is delivered within the given time frame without compromising on the quality at all.
Driven by the idea of providing top-quality Polyethylene for our customers, we at Tradeasia International aim to organize and offer top-notch Polyethylene that widely used in several industries such as:
In the packaging industry, Polyethylene used as a raw material for bags, tanks, storage bottles because of its stiffness property.
In the Piping industry, used in the manufacturing of the pipe because of its non-reactive, lightweight but high strength quality.
In pyrotechnics, as raw material for mortars in defense devices because of its much safer than formerly used steel mortars.
In electrical product production, to manufacture electrical insulator because of its property to not carry electric charges freely.
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