In-line Polymerization

Principle: Batch Polymerization

The process starts with a low viscosity monomer (also used as a solvent to clean the reactor) mixed with a catalyst or a small amount of polymer. After agitation, polymerization is started by a catalyst being introduced to activate the polymerization. Viscosity is a function of polymerization. This information is used to control the polymerization progression.

Reaction Rate    -->    Result

Too fast              -->    Exothermic, heterogeneity, difficult or impossible to stop (too high of an MW)

Too slow             -->   Time losses and final product does not reach a high enough MW. (It will never become hard as expected - or soft, or elastic)

When the required viscosity (MW) is reached, the reaction is stopped by a viscosity alarm that induces the addition of an inhibitor. The product is ready to be used (molded, laminated, extruded, etc.), or stocked (resins for paints, hot melt glues, formaldehyde, acrylic resins, polystyrenes, polyurethane, polyisobutylenes, methacrylates, etc.)

Configuration: MIVI 8001 or 8002 equipped with temperature compensation if exothermic reactions are present.

Sensor installation: the MIVI sensor can be mounted on the reactor wall near the bottom of the tank or in a circulation loop. When the process temperature stays constant and low, the sensor can be immersed inside a pipe fixed to the reactor cap when a large mixing arm is used to blend the product or when materials settle on the tank.

Similar applications: cosmetics, creams, shampoos, pharmaceuticals.