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[Chemical Knowledge]：Manufacturing method and process of PBT

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PBT(Polybutylene terephthalate) is a semi-crystalline thermoplastic polyester (Polyester), widely used in the field of engineering plastics. It has excellent mechanical properties, heat resistance, chemical resistance and electrical insulation, can be used in the manufacture of various mechanical parts, automotive parts, electronic and electrical products. This article will introduce the manufacturing method of PBT in detail.

1. Raw Material Preparation
The manufacture of
PBT requires the following raw materials:

1. Terephthalic acid (Terephthalic acid, TPA)
2.1, 4-butanediol (1,4-Butanediol, BDO)
3. Catalyst

2. Esterification Reaction
The manufacture of
PBT requires esterification reaction first, and TPA and BDO react to generate dibutylene terephthalate (BT). The esterification reaction is usually carried out at atmospheric or low pressure and requires the addition of a catalyst to accelerate the reaction rate. Commonly used catalysts include tetraethyl titanate, zinc acetate and the like. The temperature and pH value need to be controlled during the reaction to ensure the smooth progress of the reaction.
dibutylene terephthalate (BT) produced by
3. polycondensation reaction

esterification reaction requires further polycondensation reaction to produce high molecular weight PBT. The polycondensation reaction is usually carried out under vacuum conditions to increase the reaction temperature and remove the by-product water. The polycondensation reaction also requires the addition of a catalyst, and commonly used catalysts include tetrabutyl titanate, antimony acetate, and the like. In the process of polycondensation reaction, it is necessary to control the vacuum degree, temperature and catalyst dosage to obtain PBT with suitable molecular weight and high quality.

4. post-treatment
After the
polycondensation reaction is completed, the PBT needs to be post-treated, including pelletizing, drying, packaging and other processes. Pelletizing is to cut PBT into particles of a certain length and shape, which is convenient for subsequent processing and use. Drying is to remove moisture and other impurities in PBT to improve its thermal stability and processability. The packaging is to protect the PBT pellets from contamination and damage.

In summary, the production of PBT requires two main steps of esterification and polycondensation, as well as subsequent post-treatment processes. In the manufacturing process, the quality of raw materials, reaction conditions and post-treatment processes need to be strictly controlled to ensure the quality and performance of PBT. At the same time, it is also necessary to pay attention to environmental protection and safety production issues to ensure the sustainability and stability of the manufacturing process.

5. quality control

In order to ensure the quality and performance of PBT, strict quality control is required during the manufacturing process. This includes quality inspection of raw materials, real-time monitoring and adjustment of reaction processes and products, and performance testing and evaluation of products. At the same time, it is also necessary to establish a sound quality management system and standardized operating procedures to ensure the standardization and standardization of the manufacturing process.

6. environmental protection and sustainable development

As people pay more attention to environmental protection and sustainable development, the manufacturing of PBT also needs to consider environmental protection and sustainable development. This includes reducing waste and pollutant emissions in the production process, improving resource utilization efficiency, and adopting renewable resources and energy. At the same time, it is also necessary to strengthen the monitoring and management of safety risks and environmental pollution in the production process to ensure the safety and sustainability of the production process.

In short, the manufacturing method of PBT requires multiple steps and processes, and factors such as raw material quality, reaction conditions and post-treatment processes need to be strictly controlled to ensure product quality and performance. At the same time, it is also necessary to consider the issues of environmental protection and sustainable development, and adopt environmental protection technologies and measures to improve the sustainability and stability of the manufacturing process.

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