The plastic industry includes three parts: resin production, plastic preparation and plastic product production. The manufacturing process of resin is to connect many small molecular raw materials (monomers) through polymerization to become polymer compounds. According to the composition and structural changes of monomer elements, polymerization can be divided into addition polymerization and polycondensation.

The reaction of monomer addition polymerization is called polymerization, such as polyethylene. Open the double chain of ethylene (monomer) and let each ethylene molecule join hands to form polyethylene. Polycondensation not only forms polymers, but also produces low molecular by-products such as water, alcohol and ammonia.

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Precautions for using plastic products:

1, the use environment of plastic products, such as temperature resistance, cold resistance, food hygiene, wear resistance, etc.

2. Physical and mechanical properties of plastics, such as strength, rigidity, toughness, elasticity, water absorption and sensitivity to stress.

3. Plastic molding process, such as fluidity, crystallization speed, sensitivity to molding temperature and pressure, etc.

4. Shrinkage and deformation of plastic products after molding.

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