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[Chemical Knowledge]：PPR production and manufacturing methods and processes.

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PPR (random copolymer polypropylene) is a polymer material widely used in the field of chemical production raw materials, with excellent heat resistance, cold resistance, pressure resistance and corrosion resistance. This article will introduce the manufacturing method of PPR in detail.

1. Raw material preparation

1. Propylene monomer: Propylene is the main raw material for the production of PPR, which has the characteristics of high purity, low water content and low impurity content.
2. Catalyst: Usually, a titanium-based catalyst or a metallocene catalyst is used to promote propylene polymerization.
3. Additives: such as antioxidants, anti-ultraviolet agents, color agents, etc., to improve the performance and appearance quality of PPR.

2. polymerization reaction

1. pre polymerization: propylene monomer, catalyst and additives and other raw materials into the pre polymerization kettle, in a certain temperature and pressure of pre polymerization reaction, the generation of low molecular weight polypropylene.
2. Main polymerization: The prepolymer is transferred to the main polymerization kettle, and the main polymerization reaction is carried out at a higher temperature and pressure to produce a high molecular weight PPR. The

3. granulation

extrudes the main polymer through an extruder into a strip shape, and then cuts it into a certain length of granules with a pelletizer to obtain a PPR granule product.

post -4. treatment

post-treatment of the PPR granules such as drying, sieving, packaging, etc. to obtain the final PPR product.

The above is the basic manufacturing method of PPR. The following points should be paid attention to in the specific production process:

1. Control the quality and ratio of raw materials to ensure the performance and quality of the product.
2. Master the polymerization reaction temperature, pressure and time and other parameters to ensure that the molecular weight and molecular weight distribution of the product meet the requirements.
3. Keep the equipment clean and stable during the granulation process to avoid impurities and appearance defects in the product.
4. Pay attention to the storage and transportation conditions of the product during the post-processing process to prevent the product from moisture, deterioration or damage.

In short, the PPR manufacturing method requires a certain degree of technology and experience, and at the same time requires strict control of the production process to ensure product quality and performance.

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