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[Chemical Knowledge]：Manufacturing method and process of EPDM rubber

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1. of manufacturing method
of EPDM (EPDM) Introduction

EPDM (EPDM) is a widely used chemical raw material. Due to its excellent heat resistance, oxidation resistance, weather resistance, chemical resistance and low temperature flexibility, it is widely used in automobile, construction, wire and cable, aerospace and other fields. This article will introduce the manufacturing method of EPDM in detail.

2. Raw Materials Preparation

The main raw materials for manufacturing EPDM include: ethylene, propylene and a small amount of non-conjugated diene. Wherein, the ratio of ethylene and propylene can be adjusted according to actual demand, usually the ratio of ethylene and propylene is 1:2 or 1:1. The non-conjugated diene acts as a third monomer to increase the vulcanization rate and crosslink density of the rubber.

3. Polymerization

1. Initiator Addition: Initiator is added to the polymerization kettle. The initiator can be peroxide or azo compound.
2. Monomer Addition: Ethylene, propylene and non-conjugated diene monomers were proportionally added to the polymerization vessel.
3. Polymerization: Under the action of the initiator, the monomer begins to polymerize to generate EPDM. The polymerization reaction needs to be carried out at a certain temperature and pressure, usually the reaction temperature is 50-80 ° C., and the pressure is 1-3MPa.

4. post-treatment

1. Degassing: Remove unreacted monomers and low-molecular volatiles in EPDM by vacuum degassing or steam purging.
2. Extrusion granulation: The degassed EPDM rubber is granulated through an extruder to obtain rubber particles with a certain particle size.
3. Drying: The rubber particles are dried to remove moisture and other impurities.

5. quality inspection and packaging

1. Quality inspection: quality inspection of the production of EPDM rubber, including the detection of indicators such as Mooney viscosity, molecular weight distribution, vulcanization characteristics.
2. Packaging: The qualified EPDM rubber is usually packaged in polyethylene plastic bags or paper-plastic composite bags, with a net weight of 25kg or 50kg per bag.
Precautions for
6.

1. During the polymerization reaction, it is necessary to strictly control the temperature and pressure to ensure the smooth progress of the reaction and the quality of the product.
2. In the post-processing process, it is necessary to pay attention to prevent the oxidation and aging of EPDM rubber, so as not to affect the performance and service life of the product.
3. In the process of quality inspection, it is necessary to carry out inspection in strict accordance with relevant standards and regulations to ensure that the quality of products meets the requirements.

7. conclusion The manufacturing method of

EPDM rubber includes the steps of raw material preparation, polymerization reaction, post-processing, quality inspection and packaging. In the production process, it is necessary to strictly control the process parameters and operation points of each link to ensure the quality and performance of the product.

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