Manufacturing method of saturated polyester resin
I. INTRODUCTION
Saturated polyester resin (SPR) is a polymer material widely used in the field of raw materials for the production of chemicals. Due to its excellent physical properties, chemical stability, and processing properties, saturated polyester resin has a wide range of applications in the fields of coatings, adhesives, and composites. This article will detail the manufacturing method of saturated polyester resin.
II. 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.), catalysts (such as tetrabutyl titanate, stannous octanoate, etc.), polymerization blocking agent (such as hydroquinone, etc.).
2. Equipment: reactor, stirrer, thermometer, condenser, vacuum pump, etc.
3. Manufacturing method
1. Dosing: according to the predetermined formula, add saturated dibasic acid, saturated dibasic alcohol, catalyst, polymerization blocking agent and other raw materials into the reaction kettle according to the proportion. Rising temperature and melting: turn on the stirrer, gradually raise the temperature in the reaction kettle, so that the raw materials are melted and mixed evenly. Esterification reaction: Under high temperature, dibasic acid and diol will be esterified to produce oligomer. This stage requires temperature control to prevent the raw material from burning.
4. Vacuum dehydration: When the esterification reaction is carried out 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.
4. Precautions
1. Strictly control the temperature at each stage to prevent the raw material from burning or the product from degrading.
2. In the stage of vacuum dehydration, the vacuum degree and dehydration time should be controlled to avoid excessive dehydration resulting in increased viscosity of the product.
3. During the manufacturing process, the change of pressure in the reactor should be closely monitored to ensure safe production.
V. Conclusion
The manufacturing method of saturated polyester resin involves a number of links, including batching, heating and melting, esterification reaction, vacuum dehydration and post-treatment. In order to ensure product quality and production safety, the process parameters at each stage need to be strictly controlled. Through the manufacturing method introduced in this paper, saturated polyester resins with excellent performance can be produced, providing important material support for the field of raw materials for chemical production. In the actual production process, it is also necessary to adjust and optimize the process parameters according to the specific needs and conditions in order to achieve the best production results.
