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[Chemical Knowledge]：Production and manufacturing method and process flow of PBAT

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PBAT is a kind of biodegradable plastic, which has been paid more and more attention in recent years due to its environmental protection and degradability. In the field of chemical production raw materials, there are two main manufacturing methods of PBAT: blending method and chemical synthesis method. This article will detail these two manufacturing methods.

1. blending method

blending method is a method of blending PBAT with other biodegradable plastics to improve its performance and processing performance. Commonly used blend materials include PLA, PHA, PCL, etc. The specific manufacturing steps are as follows:

1. Prepare raw materials: PBAT resin, other biodegradable plastics, additives, etc.

2. ingredients: according to a certain proportion of PBAT resin and other biodegradable plastics, additives, etc. into the mixer, fully mixed.

3. Plasticization: The mixed material is added to the internal mixer or twin-screw extruder for high temperature and high pressure plasticization to make it evenly mixed and form a certain shape of particles.

4. Cooling: The plasticized particles are cooled to prevent deformation and adhesion.

5. Packaging: The cooled particles are packaged for transportation and use.

blending method can greatly improve the processability and mechanical properties of PBAT, reduce the cost and expand its application range. However, the selection and ratio of blending materials need to be optimized according to specific application scenarios to ensure product performance and degradability.

2. Chemical Synthesis

Chemical synthesis is a method of synthesizing PBAT by chemical reaction. The specific manufacturing steps are as follows:

1. Prepare raw materials: dimethyl terephthalate (DMT), 1,4-butanediol (BDO), adipic acid (AA), etc.

2. Transesterification: DMT and BDO were transesterified to produce dibutyl terephthalate (DBT) and methanol.

3. Polycondensation: DBT and AA were polycondensed to produce PBAT resin.

4. Post-treatment: The generated PBAT resin is subjected to post-treatment, including pelletizing, drying, packaging and the like.

chemical synthesis produces high-purity, high-performance PBAT resins for high-end applications. However, the production cost of this method is relatively high, and it is necessary to strictly control the reaction conditions and the quality of raw materials to ensure the quality and yield of the product.

In short, there are two main methods for manufacturing PBAT: blending and chemical synthesis. The blending method can improve the processability and mechanical properties of PBAT, reduce the cost and expand its application range; the chemical synthesis method can produce high-purity, high-performance PBAT resin, which is suitable for high-end applications. In actual production, appropriate manufacturing methods can be selected according to specific application scenarios to meet the needs of different fields.

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