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[Chemical Knowledge]：Production method and process of recycled polyester

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The manufacturing method
of recycled polyester
1. Introduction

With the development of economy and the improvement of people's living standards, plastic products are more and more widely used in daily life, which also leads to a large number of waste plastic waste. Recycled polyester is a kind of recycled waste polyester materials, after a certain treatment and processing, to restore its original performance, to achieve the purpose of reuse of environmentally friendly materials. This paper will discuss the manufacturing method of recycled polyester. The raw material
of

2. recycled polyester
recycled polyester mainly comes from waste polyester products, such as waste polyester fiber, polyester bottle, polyester film and so on. These waste products can be used as raw materials for recycled polyester after pretreatment such as recycling, sorting and cleaning.

3. recycled polyester manufacturing method

1. pretreatment
will be recycled waste polyester products for cleaning, classification, removal of impurities, get more pure waste polyester.
2. Depolymerization
The pretreated waste polyester is depolymerized under the conditions of high temperature and high pressure to decompose it into monomers or oligomers. There are many methods of depolymerization, such as alcoholysis, hydrolysis and so on.
3. Purification
The monomer or oligomer obtained after depolymerization contains certain impurities and needs to be purified to ensure the quality of recycled polyester. Methods of purification include distillation, extraction, crystallization, etc.
4. Polymerization
The purified monomer or oligomer is polymerized to produce a recycled polyester. As the polymerization method, melt polycondensation, solution polycondensation and the like can be employed.
5. Post-treatment
The regenerated polyester after polymerization needs to be post-treated, such as heat treatment, stretching, granulation, etc., to improve its performance and use value.

4. the application of recycled polyester

recycled polyester can be widely used in various fields, such as textiles, packaging, construction, automobiles, etc. In the textile field, recycled polyester can be used to make clothing, home textile products, etc.; in the packaging field, recycled polyester can be used to make food packaging, cosmetic packaging, etc.; in the construction field, recycled polyester can be used to make insulation materials, building materials, etc.

5. conclusion

recycled polyester is a kind of environmental protection, economic material, through the recycling and reuse of waste polyester products, not only can save resources, but also can reduce the pollution of the environment. This article introduces the manufacturing method of recycled polyester, including the steps of pretreatment, depolymerization, purification, polymerization and post-treatment. Through these steps, waste polyester can be converted into recycled polyester with excellent performance, which can be used in various fields. With the continuous progress of technology and the expansion of the scope of application, the development prospects of recycled polyester will be broader.

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