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[Chemical Knowledge]：Production method and process of saturated polyester resin

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The manufacturing method
of saturated polyester resin
1. Introduction

saturated polyester resin (SPR) is a polymer material widely used in the field of chemical production raw materials. Because of its excellent physical properties, chemical stability and processing performance, saturated polyester resin has a wide range of applications in coatings, adhesives, composite materials and other fields. This article will introduce the manufacturing method of saturated polyester resin in detail.

2. raw materials and equipment

1. raw materials: saturated dibasic acid (such as adipic acid, sebacic acid, etc.), saturated diol (such as ethylene glycol, propylene glycol, etc.), catalyst (such as tetrabutyl titanate, stannous octoate, etc.), inhibitor (such as hydroquinone, etc.).
2. Equipment: reaction kettle, stirrer, thermometer, condenser, vacuum pump, etc.

3. Manufacturing Methods

1. Ingredients: According to the predetermined formula, the saturated dibasic acid, saturated diol, catalyst, inhibitor and other raw materials are added to the reactor in proportion.
2. Heating and melting: Open the stirrer and gradually increase the temperature in the reaction kettle to melt and mix the raw materials evenly.
3. Esterification reaction: At high temperature, the esterification reaction of dibasic acid and diol occurs to generate oligomers. Temperature control is required at this stage to prevent the feedstock from scorching.
4. Vacuum dehydration: When the esterification reaction proceeds to a certain extent, the vacuum pump and condenser are turned on to extract the water vapor generated by the reaction to promote the esterification reaction.
5. Post-treatment: When the esterification reaction is complete, stop heating and stirring, cool the product to room temperature, then discharge and package.
Precautions for
4.

1. Strictly control the temperature of each stage to prevent raw materials from burning or product degradation.
2. In the vacuum dehydration stage, the vacuum degree and dehydration time should be controlled to avoid excessive dehydration and increase in product viscosity.
3. During the manufacturing process, pay close attention to the pressure changes in the reactor to ensure safe production.

5. conclusion The manufacturing method of

saturated polyester resin involves many links, including compounding, heating and melting, esterification reaction, vacuum dehydration and post-treatment. In order to ensure product quality and production safety, it is necessary to strictly control the process parameters of each stage. Through the manufacturing method introduced in this paper, saturated polyester resin with excellent performance can be produced, which provides important material support for the field of chemical production raw materials. In the actual production process, it is necessary to adjust and optimize the process parameters according to specific needs and conditions to achieve the best production results.

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