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[Chemical Knowledge]：The production and manufacturing method and process of general-purpose plastics.

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General Plastics Manufacturing Methods

1. Introduction

General Plastics have a wide range of applications in the field of chemical production raw materials. Due to their excellent performance and relatively low cost, they are widely used in various industrial and commercial fields. This article will introduce several general plastic manufacturing methods, including polyethylene, polypropylene, polyvinyl chloride and polystyrene.

2. polyethylene manufacturing method

polyethylene is a commonly used plastic material, mainly used in the manufacture of films, pipes, containers, etc. Its manufacturing method is mainly realized by the polymerization reaction of ethylene molecules. Specifically, ethylene molecules form long-chain molecules through addition reaction under the action of a catalyst, and finally form polyethylene. Commonly used catalysts include Ziegler-Natta catalysts and Phillips catalysts, among others.
Manufacturing method of
3. polypropylene

polypropylene is a plastic material with good heat resistance, chemical resistance and electrical insulation, and is widely used in automobiles, home appliances, construction and other fields. The manufacturing method is mainly realized by the polymerization reaction of propylene molecules. Specifically, propylene molecules form long-chain molecules through addition reaction under the action of catalyst, and finally form polypropylene. Commonly used catalysts are similar to polyethylene and also include Ziegler-Natta catalysts and the like.

4. PVC manufacturing method

PVC is a commonly used plastic material, mainly used in the manufacture of pipes, wires and cables, artificial leather, etc. Its manufacturing method is mainly realized by the polymerization reaction of vinyl chloride molecules. Specifically, under the action of initiator, vinyl chloride molecules form long-chain molecules through free radical polymerization, and finally form polyvinyl chloride. Commonly used initiators include peroxides and azo compounds, among others. Manufacturing method of

5. polystyrene

polystyrene is a plastic material with excellent insulation, transparency and processability, and is mainly used for manufacturing electrical insulation parts, daily necessities, etc. Its manufacturing method is mainly realized by the polymerization reaction of styrene molecules. Specifically, styrene molecules form long-chain molecules through free radical polymerization under the action of initiators, and finally form polystyrene. Commonly used initiators are similar to polyvinyl chloride and also include peroxides and azo compounds.
Precautions in the manufacturing process of
6.

In the manufacturing process of general-purpose plastics, the following issues need to be paid attention to: First, the choice of catalyst and initiator has an important influence on the speed of the polymerization reaction and the molecular weight distribution of the product. Therefore, it needs to be selected according to the specific situation; secondly, parameters such as temperature, pressure and stirring speed of the polymerization reaction also need to be optimized according to the specific situation, to ensure the quality and yield of the product; finally, strict quality control of the production process is required to ensure that the performance and safety of the product meet the requirements.

7. conclusion

general plastic manufacturing methods including polyethylene, polypropylene, polyvinyl chloride and polystyrene, the realization of these methods need to master the corresponding polymerization reaction principle and process parameters. At the same time, it is necessary to pay attention to the selection of catalysts and initiators, the optimization of process parameters and quality control in the manufacturing process to ensure the quality and yield of the product. Through the understanding and mastery of general plastic manufacturing methods, it can provide strong support for the development of chemical production raw materials.

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