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[Chemical Knowledge]：Production and manufacturing method and process flow of nitrile

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Acrylonitrile-butadiene rubber (NBR) is a common chemical raw material, with excellent oil resistance, high temperature resistance, chemical corrosion resistance and other properties, widely used in automotive, aerospace, petrochemical and other fields. This article will introduce the manufacturing method of nitrile rubber.

1. Raw Material Preparation

1. Butadiene: Butadiene is the main monomer for the preparation of nitrile rubber, usually produced by naphtha cracking.
2. Acrylonitrile: Acrylonitrile is another major monomer for the preparation of nitrile rubber, which is produced by the oxidation of propylene.

2. emulsion polymerization

1. formula adjustment: according to the required product performance, the butadiene and acrylonitrile are mixed according to a certain proportion, adding emulsifier, initiator and other additives, adjust the pH value to the appropriate range.
2. Polymerization: The mixed monomer is pumped into the polymerization kettle, and the emulsion polymerization reaction is carried out under the action of the initiator. During the reaction, the temperature, pressure and stirring speed should be controlled to ensure the smooth progress of the reaction.
3. Degassing and dehydration: After the polymerization, the emulsion is degassed and dehydrated to remove unreacted monomers and water.

Post -3. Treatment

1. Coagulation: A coagulant is added to the degassed and dehydrated emulsion to coagulate the rubber particles into blocks and precipitate water.
2. Washing and drying: Washing the agglomerated rubber block with clean water to remove residual emulsifier and salt, and then drying.
3. Vulcanization: The dried rubber block is vulcanized to improve its physical properties and chemical stability.

4. quality inspection and packaging

1. quality inspection: quality inspection of vulcanized nitrile rubber, including appearance, hardness, tensile strength, tear strength and other indicators.
2. Packing: Packing the qualified nitrile rubber as required for transportation and storage.

through the above steps, a nitrile rubber having excellent properties can be produced. In the production process, it is necessary to strictly control the process parameters to ensure product quality and output. At the same time, strengthen the maintenance and maintenance of production equipment, improve equipment operation rate, reduce production costs. In terms of environmental protection, the treatment of pollutants such as waste water and waste gas should be strengthened to achieve green production.

In short, the manufacturing method of nitrile rubber involves multiple links and process parameters, requiring producers to have rich experience and skills. By continuously optimizing the production process and improving the technical level, the quality and output of nitrile rubber can be further improved, and more high-quality raw materials can be provided for the development of related fields.

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