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[Chemical Knowledge]：Manufacturing method and process flow of VAE emulsion

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VAE emulsion is an important raw material for chemical production, which is widely used in coatings, adhesives, fabric treatment, paper coating and other fields. The following is the manufacturing method of VAE emulsion:

1. raw materials to prepare

1. Ethylene: using naphtha or natural gas as raw materials, it is produced by steam cracking method.
2. vinyl acetate: ethylene and acetic acid as raw materials, by vinyl acetate synthesis method.
3. initiator: benzoyl peroxide and other organic peroxides are commonly used as initiators.
4. emulsifier: commonly used non-ionic surfactants as emulsifiers, such as polyoxyethylene alkyl phenol ether.

2. Emulsion Polymerization

1. Ethylene and vinyl acetate are mixed in a certain proportion and passed into the reactor.
2. An initiator and an emulsifier are added and the emulsion polymerization is carried out at an appropriate temperature and pressure.
3. The reaction rate and temperature were controlled so that the monomer was completely converted to form a VAE emulsion.

3. Post-treatment

1. The resulting VAE emulsion was degassed to remove unreacted monomers and low molecular volatiles.
2. Adjust the pH value of the emulsion to make it more stable.
3. Filtration treatment to remove impurities and solid particles in the emulsion.

4. Packaging and Storage

The treated VAE emulsion is packed into a special container, sealed and stored away from direct sunlight and high temperature environment.

The above is the basic manufacturing method of VAE emulsion. The specific production process needs to be adjusted and optimized according to the product use and performance requirements. At the same time, in order to ensure product quality and environmental protection requirements, it is also necessary to effectively treat and discharge the waste water and waste gas generated in the production process.

In short, the manufacture of VAE emulsion needs to master certain chemical technology and production process, and at the same time, it needs to strictly abide by relevant environmental protection regulations and safety operation procedures to ensure the smooth progress of the production process and the stability and reliability of product quality.

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