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Plastics, things that are often used in our daily lives. Small plastic bags, bottles, beverage bottles, lunch boxes, plastic wrap, large to agricultural film, furniture, electrical appliances, 3D printing, and even rockets, missiles, all of which are plastic figures.
Plastic is an important branch of organic polymer materials, with many varieties, large output and wide application. For a wide variety of plastics, they can be classified as follows:
1. According to the behavior when heated, plastics can be divided into thermoplastics and thermoset science according to the behavior when heated;
2. According to the reaction type when the resin in the plastic is synthesized, the resin can be divided into a polymer type plastic and a polycondensation type plastic;
3. According to the order of the macromolecules of the resin, the plastic can be divided into two types: amorphous plastic and crystalline plastic;
4. According to the application range of performance, plastics can be divided into general plastics, engineering plastics and special plastics.
Among them, general-purpose plastics are the most widely used in our daily lives. General purpose plastics are plastics that are large in production, wide in supply, low in price, and suitable for a large number of applications. General-purpose plastics all have good molding processability, and a variety of processes can be used to form a variety of products. General purpose plastics include polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile/butadiene/styrene (ABS).
This time I mainly talk about the main properties and uses of polyethylene (PE). Polyethylene (PE) has excellent processing properties and performance, and is the most widely used variety of synthetic resins. Its production capacity ranks first in all plastics. Polyethylene resins mainly include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE).
Polyethylene is widely used in China. Thin film is its largest user, which consumes about 77% of low-density polyethylene and 18% of high-density polyethylene. In addition, injection molding products, wire and cable, hollow products, etc. all occupy its consumption structure. Larger proportion. The consumption of PE among the top five general-purpose resins ranks first. Polyethylene can be blow molded to manufacture various bottles, cans and industrial tanks, barrels and other containers; injection molding to manufacture various pots, barrels, baskets, baskets, baskets and other daily containers, daily sundries and furniture; extrusion molding Manufacture of various pipes, straps, fibers, monofilaments, and the like. In addition, it can also be used to manufacture cladding materials for wire and cable and synthetic paper. Among the many applications, the two main consumer areas of polyethylene are pipes and films. With the development of urban construction, agricultural film and various food, textile and industrial packaging industries, the development of these two fields is also growing.

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