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[Chemical Knowledge]：Production and manufacturing method and process flow of general-purpose polyvinyl chloride resin by suspension method

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Suspension method general-purpose polyvinyl chloride (PVC) resin manufacturing method

1. Introduction

polyvinyl chloride (PVC) is a widely used plastic material with excellent physical and chemical properties, such as chemical resistance, good electrical insulation, high strength, etc. PVC can be used to produce various products, such as pipes, wires and cables, plates, profiles, etc. In the field of chemical production raw materials, the suspension method is a commonly used method for the production of PVC resin. This article will detail the manufacturing method of the suspension method universal PVC resin.

2. raw materials and formula

1. Vinyl chloride monomer (VCM):VCM is the main raw material for the production of PVC, generally made by the reaction of acetylene and hydrogen chloride.
2. Initiator: An initiator is a substance that initiates the polymerization of VCM, and a persulfate, a redox initiator, or the like is generally used.
3. Dispersant: The role of dispersant is to prevent PVC resin particles from agglomerating. Commonly used dispersants are polyvinyl alcohol, methyl cellulose, etc.
4. Deionized water: It is used as a reaction medium and also plays a role in adjusting the reaction temperature.

3. manufacturing process

suspension production of PVC resin process mainly includes the following steps:

1. polymerization reaction: VCM monomer, initiator, dispersant, deionized water and other raw materials into the polymerization kettle, polymerization reaction at appropriate temperature and pressure, PVC resin particles. The polymerization reaction generally adopts batch production mode.
2. Stripping: After the polymerization reaction is completed, the reaction mixture is sent to a stripper to remove unreacted VCM monomer from the PVC resin particles with steam.
3. Drying: The PVC resin particles after stripping contain a certain amount of water and need to be dried. Generally, a fluidized bed dryer is used to remove the moisture from the resin particles with hot air.
4. Screening: The dried PVC resin particles need to be screened to separate particles of different particle sizes to obtain the desired particle size distribution.
5. packaging: PVC resin particles after screening for packaging, usually in plastic bags or paper bags.
Precautions for
4.

1. Strictly control the temperature and pressure of the polymerization reaction to ensure product quality and output.
2. The type and dosage of the dispersant have an important influence on the size and morphology of the resin particles, and need to be adjusted according to the actual situation.
3. During the drying process, the appropriate temperature and air volume should be controlled to avoid the damage and adhesion of resin particles.
4. Keep the equipment clean and stable operation during the screening process to ensure the screening effect.

5. conclusion

suspension method is a commonly used method for the production of general-purpose PVC resin, which has the advantages of stable product quality and low production cost. In the production process, it is necessary to strictly control the process parameters to ensure product quality and output. At the same time, strengthening the maintenance and maintenance of production equipment, improving the operating efficiency and service life of equipment, is also an important link to ensure the smooth progress of production.

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