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[Chemical Knowledge]：What material is polyethylene? Learn more

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1. What is polyethylene

Polyethylene is a common synthetic resin, its main component is ethylene monomer, chemical formula C2H4, with a simple and stable chemical structure. The manufacturing process of polyethylene usually uses high-pressure catalytic polymerization method, which is simply to use high-pressure oxygen, hydrogen, ethylene monomer and catalyst to react to form polyethylene raw materials with different properties.

2. the nature and advantages and disadvantages of polyethylene

1. physical properties: polyethylene has the characteristics of light weight, good flexibility, high transparency, good cold resistance, so in the manufacture of plastic bags, plastic bottles, plastic pipes and other products, especially favored.

2. mechanical properties: the tensile strength and compressive strength of polyethylene are high, but the wear resistance is poor.

3. chemical resistance: polyethylene at a certain temperature can withstand chemical corrosion, not easy to leak, but vulnerable to acid, alkali, solvent and other corrosion.

4. processing performance: polyethylene processing performance is good, can produce a variety of shapes, sizes of products.

advantages: light weight, environmental protection (recyclable), high transparency, good cold resistance, low cost.

disadvantages: poor wear resistance, mechanical strength is slightly lower, vulnerable to chemical corrosion.

3. the manufacturing process of polyethylene The manufacturing process of

polyethylene is divided into the following steps:

1. Polymerization: High-pressure catalytic polymerization is currently the most commonly used manufacturing method, which can be divided into free radical polymerization, ion polymerization, Carbonyl polymerization, etc. The catalyst is a key factor in determining surface activity and yield.

2. Extrusion molding: The pellets or small pieces made of polyethylene are heated and melted and then formed by an extruder to make products of various shapes and sizes.

3. Injection molding: After polyethylene is made into particles or small pieces, it is heated and melted, and the shape in the mold is formed by an injection molding machine. It is also a common method for manufacturing polyethylene products.

4. polyethylene applications

polyethylene manufacturing products cover all aspects of life, such as:

1. food packaging: polyethylene material has good cold resistance and chemical resistance, high transparency, and easy to process into a bag, so often used in food bags, cling film and other products manufacturing.

2. Medical devices: polyethylene can be made into transparent test tubes, syringes, infusion bags and other medical devices through appropriate processing methods. Its material has good biocompatibility and chemical stability, and will not produce obvious adverse reactions to the human body.

3. Furniture supplies: Polyethylene can be made into furniture with different shapes by injection molding, extrusion, blow molding and other methods. It is light, not easy to break, not easy to deform, and the cost is relatively low.

To sum up, polyethylene is a widely used material. Due to its low cost and convenient processing, its application prospects in industry and life are very broad. It is believed that this paper has made a comprehensive introduction to the basic properties, manufacturing process and application fields of polyethylene, hoping to provide help and reference for everyone.