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[Chemical Knowledge]：Manufacturing method and process flow of transparent PP

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Transparent PP (polypropylene) manufacturing method

1. Introduction

transparent PP is a widely used chemical production raw materials, because of its high transparency, heat resistance, cold resistance, electrical insulation and mechanical strength, is widely used in various fields. This article will introduce the manufacturing method of transparent PP in detail.

2. material preparation

1. Propylene monomer: Propylene is the main raw material for the production of PP, which requires high purity and generally needs to reach more than 99.5%.
2. Catalyst: A Ziegler-Natta catalyst or a metallocene catalyst is generally used.
3. Auxiliaries: such as antioxidants, antistatic agents, etc.

3. production process

transparent PP production process mainly includes polymerization, granulation, drying and packaging steps.

1. Polymerization

In the polymerization reactor, propylene monomer, catalyst and other additives are added in a certain proportion to carry out polymerization reaction. Polymerization reactions generally employ continuous stirred tank reactors (CSTR) or batch reactors. Factors such as reaction temperature, pressure and amount of catalyst affect the rate of polymerization and the molecular weight of PP.

2. Granulation
After the
polymerization reaction is completed, the obtained PP powder needs to be granulated by a granulator for subsequent processing and use. During the granulation process, some additives need to be added to improve the processing performance and stability of PP.

3. Drying
After the
granulation is completed, the PP particles need to be dried to remove water and other volatile substances. Air drying or vibration drying is generally used.

4. Packaging
After the
is dried, the PP granules need to be packaged to prevent them from moisture and contamination. Generally, polyethylene plastic bags or paper-plastic composite bags are used for packaging.

4. precautions

1. In the polymerization reaction, the reaction conditions need to be strictly controlled to ensure that the molecular weight and molecular weight distribution of PP meet the requirements.
2. In the granulation process, it is necessary to select appropriate additives and processing conditions to improve the processing performance and stability of PP.
3. During the drying process, it is necessary to control the drying temperature and time to prevent the deformation and discoloration of PP particles.
4. During the packaging process, it is necessary to ensure the airtightness and moisture resistance of the packaging bag to prevent PP particles from being damp and contaminated.

5. quality control

In order to ensure that the quality of transparent PP meets the requirements, strict quality control is required. Generally include the following aspects:

1. molecular weight and molecular weight distribution: through gel permeation chromatography (GPC) and other methods to detect, to ensure that the molecular weight and molecular weight distribution of PP meet the requirements.
2. transparency: by measuring the light transmittance and haze and other methods to detect, to ensure that the transparency of PP meet the requirements.
3. mechanical properties: through tensile test, impact test and other methods to ensure that the mechanical properties of PP meet the requirements.
4. thermal stability: thermal gravimetric analysis (TGA) and other methods to ensure that the thermal stability of PP meet the requirements.

6. Conclusion The manufacturing method of

transparent PP involves the control of multiple links and process parameters, and needs to be operated in strict accordance with the requirements to ensure that the quality of the product meets the requirements. At the same time, it is also necessary to strengthen the quality control and safety management in the production process to ensure the smooth progress of the production process.

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