Polyethylene powder (PE for short) is a thermoplastic resin made from ethylene through polymerization. The low molecular weight is colorless liquid, and the high molecular weight is tasteless, odorless, non-toxic, lusterless, milky white wax particles. Soluble in water, slightly soluble in hydrocarbons, etc. It can resist the corrosion of most acids and alkalis, has low water absorption, can still maintain flexibility at low temperatures, and has high electrical insulation. In industry, it also includes ethylene and a small amount of α- Copolymers of olefins. It has excellent low temperature resistance (the minimum use temperature can reach - 100~- 70 ° C), good chemical stability, and resistance to most acids and alkalis (not resistant to acids with oxidizing properties). It is insoluble in general solvents at room temperature, with small water absorption and excellent electrical insulation.
Polyethylene is very sensitive to environmental stress (chemical and mechanical action), and its thermal aging resistance is inferior to the chemical structure and processing strip of polymer. Polyethylene can be processed by general thermoplastic molding method. It has a wide range of applications, mainly used to manufacture films, packaging materials, containers, pipes, monofilament, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials for television, radar, etc. With the development of petrochemical industry, polyethylene production has developed rapidly.
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Chemical Formula |
C4H10 |
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Exact Mass |
58 |
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Molecular Weight |
58 |
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m/z |
58 (100.0%), 59 (4.3%) |
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Elemental Analysis |
C, 82.66; H, 17.34 |
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Polyethylene powder (PE), as one of the most widely used plastics globally, has demonstrated its irreplaceable value in various fields due to its superior physical and chemical properties.
Packaging materials
Polyethylene has become the preferred material in the packaging industry due to its excellent moisture resistance, waterproofing, and airtightness. It is widely used in food packaging, retail bags, and storage bags, effectively protecting products from environmental factors. In addition, bubble wrap made of polyethylene is commonly used for packaging fragile items due to its excellent impact resistance and cushioning properties, providing safety guarantees for the transportation of items.
(1) Food packaging:
Polyethylene is widely used in the field of food packaging, including plastic bags, cling film, food storage containers, etc. Due to its non toxicity and corrosion resistance, polyethylene can ensure the safety and hygiene of food. Meanwhile, polyethylene material also has good transparency, allowing consumers to clearly see the food inside the packaging and increasing their desire to purchase.
(2) Retail and storage bags:
Polyethylene made retail and storage bags are lightweight, durable, easy to carry and store. They are widely used in retail places such as supermarkets and shopping malls, as well as in daily household storage. These bags not only have good waterproof performance, but also effectively prevent dust and dirt from entering the interior of the packaging, keeping items clean and tidy.
(3) Bubble film:
Polyethylene bubble film is a protective material with excellent buffering properties. It is widely used in the packaging of fragile items such as electronic products, glass products, ceramic products, etc. The bubble structure inside the bubble film can absorb and disperse impact forces, effectively protecting items from damage. At the same time, bubble wrap also has good sound insulation and thermal insulation properties, and can be used in fields such as sound insulation materials and thermal insulation materials.
Home goods
Polyethylene made household items are lightweight, durable, impact resistant, and easy to clean. They are widely used in indoor and outdoor environments, bringing convenience and comfort to people's lives.
(1) Plastic furniture:
Plastic furniture made of polyethylene has the advantages of being lightweight, durable, and easy to clean. They are widely used in outdoor furniture, children's furniture and other fields. Outdoor furniture such as plastic chairs, plastic tables, etc. can withstand harsh environments such as wind and sun, and maintain a long service life. Children's furniture such as plastic toys, plastic beds, etc. can ensure the safety and health of children.
(2) Storage boxes and storage compartments:
Polyethylene storage boxes and storage compartments have good sealing and moisture resistance. They are widely used in daily household storage, such as storing clothes, toys, books, and other items. These boxes not only effectively prevent dust and dirt from entering the interior, but also keep items dry and tidy.
(3) Kitchen supplies:
Polyethylene powder is also widely used in the field of kitchen supplies. For example, kitchen utensils such as cutting boards, cling film, and food storage containers are all made of polyethylene. These products not only have non-toxic and corrosion-resistant properties, but also ensure the hygiene and safety of food. At the same time, they also have the advantages of being lightweight and easy to clean, bringing convenience to people's kitchen life.
Industrial and Architectural Design
Polyethylene is also widely used in industrial and architectural design fields. Due to its corrosion resistance and chemical resistance, polyethylene is widely used in the design of industrial pipelines, storage tanks, waterproof membranes, and protective pads.
(1) Industrial pipelines and storage tanks:
Polyethylene pipelines and storage tanks have advantages such as corrosion resistance, wear resistance, lightweight and high strength. They are widely used in liquid and gas transportation systems in industries such as chemical, petroleum, and water treatment. Polyethylene pipes and storage tanks can withstand harsh environments such as high temperature and pressure, and maintain a long service life. At the same time, they also have the advantages of easy installation and convenient maintenance, reducing engineering costs and time.
(2) Waterproof membrane and protective pad:
Polyethylene material is often used as a waterproof membrane or protective pad in architectural design. They can effectively prevent water infiltration and erosion of the foundation and structure of buildings, ensuring their stability and safety. Polyethylene waterproof film and protective pad have the advantages of lightweight, flexibility, and aging resistance, and can adapt to various complex terrains and climatic conditions.
Other applications
In addition to the above-mentioned fields, polyethylene is also widely used in agriculture, healthcare, automotive and other fields.
(1) Agricultural applications:
Polyethylene is widely used in the field of agriculture. For example, agricultural film, greenhouse film, etc. are all made of polyethylene. These films can effectively increase soil temperature and humidity, promoting crop growth and development. At the same time, they can also prevent weed growth and the spread of pests and diseases, improving crop yield and quality. In addition, polyethylene is also used to manufacture agricultural tools such as fishing nets and ropes, providing convenience for agricultural production.
(2) Medical applications:
Polyethylene also has certain applications in the medical field. For example, some medical devices and surgical supplies are made of polyethylene. These products have the advantages of being non-toxic, odorless, and corrosion-resistant, which can ensure the safety and hygiene of medical processes. Meanwhile, polyethylene also has good flexibility and plasticity, which can be used to make various shapes and sizes of medical devices and supplies to meet the needs of medical work.
(3) Automotive applications:
Polyethylene also has certain applications in the field of automotive manufacturing. For example, car interior parts, exterior parts, fuel tanks, and other components are all made of polyethylene. These components have advantages such as lightweight, high strength, and corrosion resistance, which can reduce the weight and fuel consumption of the car, and improve its performance and comfort. Meanwhile, polyethylene also has good processing performance and plasticity, which can adapt to the manufacturing needs of various complex shapes and sizes of automotive components.
Development and Application of High Performance Polyethylene
With the advancement of technology and the increasing demand for material properties, the development and application of high-performance polyethylene have also received increasing attention. High performance polyethylene materials such as high-density polyethylene (HDPE) and ultra-high molecular weight polyethylene (UHMWPE) have stronger wear resistance and wider industrial application prospects.
(1) High density polyethylene (HDPE):
HDPE is a polyethylene material with high density, high strength, and high rigidity. It is widely used in fields such as packaging, container manufacturing, piping systems, and automotive components. HDPE has excellent impact strength and wear resistance, and can withstand various harsh environmental and stress conditions. At the same time, HDPE also has good processing performance and plasticity, which can adapt to the manufacturing needs of various complex shapes and sizes of products.
(2) Ultra high molecular weight polyethylene (UHMWPE):
UHMWPE is a polyethylene material with extremely high molecular weight. It has extremely high wear resistance, self-lubricating properties, and impact resistance. UHMWPE is widely used in the manufacturing of sliding parts, linings, bearings, and other components in the field of friction and wear. At the same time, UHMWPE also has good biocompatibility and corrosion resistance, and can be used to manufacture medical devices and artificial joints and other medical supplies.
Polyethylene powder is a versatile material with a wide range of applications across multiple industries. Its different types, including LDPE, HDPE, and LLDPE, offer a variety of properties that can be tailored to specific needs. The production methods, from polymerization to post - polymerization processing, ensure the production of high - quality powder with controlled properties. As the world moves towards a more sustainable future, the development of sustainable production methods, advanced materials, and smart coatings will further enhance the role of polyethylene powder in various industries, making it an even more valuable and indispensable material.
Polyethylene powder can be divided into high pressure method, medium pressure method and low pressure method according to polymerization pressure.
High pressure method is used to produce low-density polyethylene. This method was developed early. The polyethylene produced by this method has accounted for about 2/3 of the total polyethylene output so far. However, with the development of production technology and catalyst, its growth rate has lagged behind that of low pressure method.
Low pressure method includes slurry method, solution method and gas phase method.
Slurry method is mainly used to produce high-density polyethylene, while solution method and vapor phase method can not only produce high-density polyethylene, but also produce medium and low-density polyethylene (also known as linear low-density polyethylene ) by adding comonomers. Various low-pressure processes have developed rapidly.
The method of polymerizing ethylene into low-density polyethylene using oxygen or peroxide as initiator. Ethylene enters the reactor after secondary compression and polymerizes into polyethylene under the pressure of 100~300 MPa, temperature of 200~300 ℃ and the action of initiator. The reactants are separated by decompression to recycle the unreacted ethylene. Molten polyethylene is extruded and granulated after adding plastic additives.
There are three methods: slurry method, solution method and gas phase method. Except solution method, polymerization pressure is below 2 MPa. The general steps include catalyst preparation, ethylene polymerization, polymer separation and granulation.
① Slurry method: The polyethylene produced is insoluble in solvent and looks like slurry. Slurry polymerization has mild conditions and is easy to operate. Alkyl aluminum is often used as an activator, hydrogen is used as a molecular weight regulator, and kettle reactor is often used. The polymer slurry from the polymerization kettle is sent to the powder dryer through the flash kettle and gas-liquid separator, and then it is granulated. The production process also includes solvent recovery, solvent refining and other steps. The products with different molecular weight distribution can be obtained by using different polymerization reactors in series or in parallel.
② Solution method: polymerization is carried out in solvent, but ethylene and polyethylene are both soluble in solvent, and the reaction system is homogeneous solution. The reaction temperature (≥ 140 ℃) and pressure (4-5MPa) are high. It is characterized by short polymerization time, high production intensity, and can also produce high, medium and low density polyethylene, which can better control the properties of products; However, the polymer obtained by solution method has low molecular weight, narrow molecular weight distribution and low solid content.
③ Gas phase method: ethylene is polymerized in the gaseous state, usually in a fluidized bed reactor. There are two kinds of catalysts, namely chromium system and titanium system, which are added into the bed quantitatively from the storage tank. High speed ethylene circulation is used to maintain the fluidization of the bed and eliminate the heat of polymerization reaction. The polyethylene generated is discharged from the bottom of the reactor. The pressure of the reactor is about 2 MPa, and the temperature is 85~100 ℃. The gas phase method is the most important method to produce linear low density polyethylene. The gas phase method saves solvent recovery and polymer drying processes, and saves 15% of investment and 10% of operating cost compared with the solution method. It is 30% of the investment of traditional high-pressure method and 1/6 of the operation cost. Therefore, it has developed rapidly. However, the gas phase method needs to be further improved in terms of product quality and variety.
Using chromium catalyst supported on silica gel, ethylene is polymerized under medium pressure in a loop reactor to produce high-density polyethylene powder.
Frequently Asked Questions
What is polyethylene mostly used for?
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Polyethylene or polythene (abbreviated PE; IUPAC name polyethene or poly(methylene)) is the most commonly produced plastic. It is a polymer, primarily used for packaging (plastic bags, plastic films, geomembranes and containers including bottles, cups, jars, etc.).
Is polyethylene glycol a safe laxative?
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As a medication, PEG is a part of the laxative class. FDA-approved indications include the treatment of constipation in patients 17 years of age and older. PEG is preferred over other agents for chronic constipation and disimpaction as it was associated with limited adverse effects and a better-tasting profile.
Is polypropylene safe for the body?
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No, polypropylene is not harmful. It is a safe plastic commonly used in food containers, medical products, and fabrics. It does not contain harmful chemicals like BPA and is non-toxic. Polypropylene is also resistant to heat, so it doesn't release dangerous substances when heated.
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