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[Chemical Knowledge]：In-depth analysis of plastics-from chemical to application

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The origin of 1. plastic

plastic, as the name suggests, refers to a material that can be shaped. The earliest plastic is nitrocellulose, but this plastic has a greater security risk. By the beginning of the 20th century, new plastics such as phenolic resin and urea resin began to appear and were widely used.

2. the chemical properties of plastic

1. polymer: plastic is a polymer-based material. Polymers are macromolecular chains composed of monomer molecules. Different types of monomers will be linked into different polymer structures, resulting in different properties of plastic materials.

2. water absorption: relative to metal, glass and other materials, plastic absorption of water is strong. This is also one of the reasons why you need to pay attention to moisture during use.

3. Softening point: The softening point of plastic means that at a certain temperature, the hardness of the plastic will decrease, making it easier to form. Different types of plastics have different softening points.

3. plastic production process

1. extrusion molding: through the compression system and mold, the plastic is heated and melted to form the desired shape, such as plastic pipe, strip and so on.

2. Injection molding: After the plastic particles are heated and melted, they are injected into the injection machine, and then the plastic is injected into the mold through high pressure to form the required shape, such as various plastic parts.

4. plastic

1. daily necessities: all kinds of plastic cups, plastic bowls, plastic tableware, cosmetic bottles and so on.

2. toys: all kinds of plastic toys, educational toys and so on.

3. Packing: plastic bags, plastic bottles, bubble film, etc.

4. Industry: vehicle parts, building materials, electronic equipment housings and accessories, etc.

5. different types of plastic

1. polyethylene PE: has good corrosion resistance and flexibility, is widely used in packaging, construction and other fields.

2. PVC: PVC has good weather resistance, UV resistance and insulation properties, and is widely used in construction, automobiles and other fields.

3. Polystyrene PS: With good gloss and transparency, it is widely used in packaging, manufacturing optical discs and other fields.

6. plastic environmental problems and solutions

1. waste plastic recycling: through recycling, reduce waste plastic waste of resources, and can slow down the pollution of the earth's environment and lack of resources.

2. Research and development of low-carbon environmentally friendly plastics: Through the research and development of new environmentally friendly plastics, it has better biodegradability and recycling performance to reduce the damage to the environment during the production process.

7. Conclusion

Through the in-depth analysis of plastic materials, we have a more comprehensive understanding of the chemical properties of this material, production process and application range and other aspects. In the future, we should pay more attention to the environmental protection of plastics, so as to effectively protect the earth's environment.