Plastic raw materials are a general term. According to the use of plastic raw materials and some differences in other aspects, we divide plastic raw materials into four categories: general plastic raw materials, thermoplastic elastomer raw materials, engineering plastic raw materials, and thermosetting plastic raw materials.
The use of plastic raw materials is very wide. Many common daily necessities in life are made of plastic, such as lamp shades, instrument shells and some children's toys. The main raw materials of plastics are synthetic resins. In the early stage, coal tar products and calcium carbide are the main products. Now, petroleum and natural gas products are the main products, such as ethylene, propylene, benzene, formaldehyde and urea. First, the appropriate macromolecular components in oil and natural gas are extracted, first cracked into monomers, and then polymerized into polymers to become plastics. This depends on what kind of plastic is used to make plastics. For example, polypropylene (PP) is polymerized with propylene monomer, and propylene monomer is extracted from petroleum. It should be said that almost all monomers are extracted from petroleum. It is extracted from petroleum, and the other is polyethylene, which can be formed after polymerization. Different plastics are formed under different conditions as required.
At present, resins refer to polymers that have not been mixed with various additives. The resin accounts for about 40% ~ 100% of the total weight of the plastic. The basic properties of plastics mainly depend on the nature of the resin, but additives also play an important role. Some plastics are basically composed of synthetic resins without or without additives, such as plexiglass and polystyrene. The so-called plastic is actually a kind of synthetic resin. Its shape is similar to that of natural resin, but it is also synthesized by chemical force, so it is called plastic.
As we all know, plastics are afraid of heat. When the temperature is too high, the plastics may melt. However, there is a special kind of plastic that can work at high temperatures. It is polyphenylene ether plastic raw material. This kind of plastic can be used to make some gears and machine parts that can work at a high temperature. What kind of special plastic is this? The main raw materials of plastic bags are polyethylene and polyvinyl chloride, which are non degradable; The main raw materials for the production of plastic bags include polystyrene, polypropylene and other polymer compounds. After the waste plastic packaging enters the environment, it is difficult to degrade, which will cause long-term and deep-seated ecological and environmental problems. However, it should be noted that some waste plastic packaging materials are mixed in the soil, which will affect the absorption of nutrients and water by crops, and will lead to crop production reduction; Waste plastic packaging discarded in land or water can be swallowed by animals as food, which will lead to animal death.
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