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[Chemical Knowledge]：The production process and preparation method of EVA resin.

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EVA resin is an excellent engineering plastic, with high heat resistance, high strength, wear resistance, acid and alkali resistance and other characteristics, so in the automobile manufacturing, electronic appliances, shoes, packaging and other fields have a wide range of applications. This article will introduce the production process and preparation method of EVA resin.

EVA resin production process

EVA resin is prepared by the copolymerization of ethylene and vinyl acetate monomers. The production process includes the following steps:

1. ethylene and vinyl acetate monomer are added into the reactor;
2. initiator is added to start the polymerization reaction;
3. after adjusting the temperature and pressure, the reaction to a certain extent, with a certain degree of EVA resin;
4. the product after degassing and refining process, get the final EVA resin.

EVA resin preparation method

EVA resin preparation method mainly includes the following aspects:

1. monomer selection: ethylene and vinyl acetate monomer selection has a great influence on the performance of EVA resin. Generally speaking, the content of ethylene is higher, which can improve the strength and hardness of EVA resin, while the content of vinyl acetate is higher, which can improve the flexibility and elasticity of EVA resin.

2. Selection of initiator: The selection of initiator needs to be determined according to the type and proportion of monomers. In general, for the copolymerization of ethylene and vinyl acetate monomers, an initiator such as peroxide or ammonium persulfate may be used.

3. Control of reaction conditions: The control of reaction conditions includes temperature, pressure, reaction time, etc. In general, the reaction of the EVA resin is carried out at a temperature in the range of 120 to 160 ° C., and the pressure is generally 10 to 25MPa. The reaction time is determined depending on the kind and ratio of the monomers, and is generally 1 to 6 hours.

4. Degassing and refining: The degassing and refining treatment of EVA resin can remove impurities and unstable components in the product and improve the quality and stability of the product.

In general, the production process and preparation method of EVA resin is a relatively complex process, and every link in it requires strict control and operation. However, only under strict control can EVA resin with excellent performance be produced.