Manufacturing method of CASE polyether polyol
CASE polyether polyol is an important raw material for the production of chemicals, which is widely used in the fields of polyurethane foams, coatings, adhesives and so on. In this article, we will introduce the manufacturing method of CASE polyether polyol, including the steps of raw material preparation, polymerization reaction and post-treatment.
I. Raw material preparation
1. Ethylene oxide: Ethylene oxide is the main raw material for the preparation of polyether polyol, and its quality has a great influence on the performance of the final product. Therefore, it is necessary to choose ethylene oxide with high purity and low moisture.
2. Starting agent: starting agent is the key raw material in the synthesis of polyether polyol, commonly used starting agents are polyols, amines and so on. Different starting agents will affect the molecular structure and properties of polyether polyol.
3. Catalyst: The addition of catalyst is required during the polymerization reaction to promote the reaction between ethylene oxide and the initiator. Commonly used catalysts are alkaline catalysts and acid catalysts.
II. Polymerization reaction
1. Pre-mixing: Mix the starting agent, catalyst and part of ethylene oxide and stir well.
2. Polymerization: Add the premix into the polymerization kettle, pass the remaining ethylene oxide, control certain temperature and pressure, and carry out the polymerization reaction. During the polymerization reaction, the progress of the reaction needs to be constantly monitored to ensure that the molecular weight and hydroxyl value of the product are as expected.
3. Post-treatment: After the polymerization reaction is finished, post-treatment is required, including neutralization, dehydration, filtration and other steps, in order to obtain high-quality polyether polyol products.
3. Influencing factors and control
1. Temperature: The temperature of the polymerization reaction will affect the reaction rate and the molecular weight of the product. Generally speaking, an appropriate increase in temperature is favorable to accelerate the reaction rate, but too high a temperature will lead to an increase in side reactions and affect product quality. Therefore, it is necessary to control the reaction temperature according to the actual situation.
2. Pressure: The pressure of polymerization reaction also affects the reaction rate and product molecular weight. Appropriately increase the pressure is conducive to accelerate the reaction rate, but too high a pressure will increase the cost of equipment and operating difficulties. Therefore, it is necessary to choose the appropriate pressure according to the equipment conditions and product requirements.
3. Catalyst type and dosage: different types of catalysts have different effects on the polymerization reaction, choosing the right catalyst and dosage can improve the reaction rate and product quality.
4. Purity of raw materials: the purity of raw materials has a great influence on the quality of products, and we need to choose raw materials with high purity.
4. Product quality inspection
In order to ensure the product quality of CASE polyether polyol, it is necessary to conduct a comprehensive quality inspection of the product, including molecular weight, hydroxyl value, acid value, moisture and other indicators. At the same time, application performance test is also needed to ensure the applicability of the products in different fields.
In conclusion, the manufacturing method of CASE polyether polyol requires strict control of process parameters and raw material quality in each step to ensure the performance and quality of the final product.
