The preparation process of amino silicone oil is a complex and delicate chemical reaction process. The key lies in selecting suitable raw materials and catalysts and strictly controlling the reaction conditions. The following is a typical example of the preparation process of amino silicone oil:

First, it is necessary to prepare the main raw materials, such as octamethylcyclotetrasiloxane (D4) or dimethylcyclosiloxane mixture (DMC), and silane coupling agents, such as bisaminopropyltetramethyldisiloxane. The selection of these raw materials will directly affect the performance and use of the final product.

Next, a certain amount of silane coupling agent and nitrogen-treated D4 or DMC are added to a reactor equipped with an agitator, a reflux condenser and a nitrogen pipe. Then, the temperature is raised to a certain temperature (such as 80°C) and an alkaline catalyst, such as tetramethylammonium hydroxide, is added. The amount of catalyst added is usually small, but it has an important effect on the reaction rate and the molecular weight of the product.

Under the action of the catalyst, the silane coupling agent and D4 or DMC undergo a ring-opening polymerization reaction to produce amino silicone oil. Continuous stirring is required during the reaction to ensure that the reaction proceeds evenly. After the reaction is completed, the temperature needs to be raised to remove the catalyst to avoid adverse effects on subsequent applications.

In addition, according to the specific needs of the product, the molecular weight, ammonia value and other performance parameters of the amino silicone oil can also be controlled by adjusting the raw material ratio, reaction temperature and time. For example, higher reaction temperature and longer reaction time usually lead to higher molecular weight and ammonia value.

Finally, the reaction product is post-treated, such as neutralization, filtration, decolorization, etc., to obtain an amino silicone oil product that meets the requirements. These post-treatment steps help remove impurities and improve the purity and stability of the product.

In summary, the preparation process of amino silicone oil requires strict control of raw material selection, reaction conditions and post-treatment steps to ensure that the quality and performance of the final product meet the application requirements.