PP-H (homopolymerized polypropylene) is a widely used raw material in the field of chemical production, and is favored for its excellent heat resistance, chemical resistance and mechanical properties. This article will introduce the manufacturing method of PP-H in detail.
I. Raw material preparation
1. Propylene: propylene is the main raw material for the production of PP-H, which requires high purity, generally need to reach more than 99.5%.
2. Catalyst: catalyst is the key component in the production of polypropylene, usually using titanium or magnesium catalyst.
3. co-catalyst: co-catalyst is used to improve the activity of the catalyst, commonly used co-catalysts such as aluminum chloride.
2. Polymerization reaction
1. Pretreatment: Add propylene, catalyst and co-catalyst into the pre-processor according to a certain proportion for mixing and preheating treatment.
2. Polymerization: The pretreated mixture is fed into the polymerization reactor, and the polymerization reaction is carried out under suitable temperature and pressure conditions to produce polypropylene.
3. Flashing: After the polymerization reaction is completed, the unreacted residues such as propylene and catalyst are separated from the polypropylene by means of flashing.
3. Granulation and Packaging
1. Granulation: After flash evaporation, polypropylene is in the form of powder, which needs to be granulated into granules of a certain size for ease of transportation and processing.
2. Packing: The granulated polypropylene particles are packed, usually in plastic bags or paper bags.
4. Precautions
1. Strictly control the quality of raw materials to ensure product purity.
2. The polymerization reaction process needs to maintain the appropriate temperature and pressure to ensure the smooth progress of the reaction.
3. The particle size needs to be controlled during granulation to ensure the processing performance of the product.
4. Pay attention to the safety in the production process, and comply with the relevant operating procedures.
In conclusion, the manufacturing method of PP-H involves a number of links and precautions, in order to ensure product quality and production safety, need to strictly control the process parameters and operating procedures of each link. Through scientific manufacturing methods, high-quality PP-H products can be produced, providing high-quality raw materials for the chemical production field.
