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[Chemical Knowledge]：Production and manufacturing method and process of polyisobutylene

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The manufacturing method
of polyisobutylene
1. Introduction

Polyisobutylene (Polyisobutylene, referred to as PIB) is a polymer compound, mainly from the polymerization of isobutylene monomer. Because of its unique molecular structure and properties, polyisobutylene is widely used in the fields of lubricating oil, rubber, plastic, adhesive and so on. This article will introduce the manufacturing method of polyisobutylene in detail.

2. manufacturing method

1. catalyst selection

polyisobutylene manufacturing process, the choice of catalyst is very important. Commonly used catalysts are aluminum chloride, boron trifluoride, zinc chloride, etc. Among them, the aluminum chloride catalyst has a high activity, but it is necessary to carry out the polymerization reaction at a low temperature. Boron trifluoride catalysts are moderately active, but require reactions under anhydrous conditions. The zinc chloride catalyst has higher selectivity and can obtain high molecular weight polyisobutylene.

2. Polymerization
The polymerization of the
isobutylene monomer can be carried out in various ways such as solution polymerization, suspension polymerization and gas phase polymerization. Among them, the solution polymerization is to add isobutylene monomer and catalyst into the solvent for polymerization reaction, commonly used solvents are hydrocarbons, alcohols and so on. Suspension polymerization is to add the catalyst to water to form a suspension system, and then add isobutylene monomer for polymerization. The gas phase polymerization is carried out under the condition of high temperature and high pressure, and the isobutylene monomer and the catalyst are directly added into the reactor to carry out the polymerization reaction.

3. Molecular Weight Control

The molecular weight of polyisobutylene has an important influence on its properties and applications. Therefore, the molecular weight needs to be strictly controlled in the manufacturing process. Generally, the molecular weight can be controlled by adjusting the amount of catalyst, reaction temperature, pressure, etc.

4. Post-treatment

After the polymerization reaction is completed, the polymer needs to be post-treated to remove impurities such as catalyst and solvent. Commonly used post-treatment methods include hot water washing, acid-base treatment, steam purging, etc.

3. Precautions

1. During the manufacturing process, the amount and activity of the catalyst should be strictly controlled to avoid producing too many low molecular weight polymers.
2. During the polymerization reaction, proper temperature and pressure should be maintained to ensure the smooth progress of the reaction.
3. In the post-treatment process, it should be ensured that the polymer is fully cleaned to avoid the impact of residual impurities on product quality.

4. application prospects

polyisobutylene as an important chemical raw material, has a wide range of applications in various fields. With the continuous development of science and technology, the manufacturing method of polyisobutylene has been continuously improved and optimized, which has improved the quality and yield of products. At the same time, with the increasing attention to environmental protection and sustainable development, the environmental performance and sustainability of polyisobutylene have become an important research direction. In the future, the application field of polyisobutylene will be more extensive, which will inject new vitality into the development of the chemical industry.

5. conclusion

polyisobutylene as an important polymer compound has broad application prospects in the field of chemical production raw materials. The manufacturing method mainly includes the steps of catalyst selection, polymerization reaction, molecular weight control and post-treatment. In the manufacturing process, the process parameters of each link should be strictly controlled to ensure product quality and output. With the continuous progress of science and technology and the continuous improvement of application requirements, the manufacturing method of polyisobutylene will continue to improve and optimize, and make greater contributions to the development of the chemical industry.

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