Reactor mixing motor
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I would like to ask the experts here: I currently have a reaction kettle equipped with two mixing motors, which are mainly used for synthesizing water-based polyurethanes; one of these motors is used for scraping the walls of the kettle. The motor has a power of 15 KW, and it is equipped with a reducer that allows for speed adjustment between 0 and 60 revolutions per minute. There is one main shaft used for stirring, of the paddle type. The motor for this purpose has a power of 11 KW. In the synthesis process, the oil phase is synthesized first, after which water is added. The frame and the main shaft are then started to stir, so that the oil phase and water mix evenly. At first, the viscosity will rise to 200,000 CPS, but it will later decrease. Once the mixture is well mixed, a homogenizer is used to further homogenize it. I would like to ask: should my main shaft be driven by a reducer that allows speeds from 0 to 60 revolutions per minute, or should I use an inverter to adjust the speed and achieve high-speed stirring? Which of these two methods is more effective in ensuring a more even mixture of the oil phase and water? Thank you!
Personally, I think inverters are useful for control
Our unit keeps using high speed when carrying out the aqueous phase neutralization
It seems the rotation speed isn’t high enough, so the effect is poor.
If emulsification is desired, high-speed stirring is still necessary
To mix well, it’s necessary to stir at high speed; I was even criticized by my teacher during synthesis experiments in college because I didn’t set the stirring speed high enough. . . . Provided that your motor can handle it, you need to consider the load on the motor when trying to maintain high speeds with increased viscosity. It was after reading your post that I learned how polyurethane is actually produced – in an aqueous medium
It’s probably used for water-based polyurethane coatings!
Gearboxes are used in frame-type mixers, while high-speed mixers are employed for mixing tasks that require rapid stirring
After mixing the oil and water, use high-speed stirring; high shear helps with emulsification； Variable frequency drives are useful for speed control.