METHOD FOR CLEANING A POLYMERIZATION REACTOR
The invention relates to a method for cleaning a polymerization reactor for producing aqueous polymer dispersions by means of radical-initiated emulsion polymerization of one or more ethylenically unsaturated monomers in the presence of one or more protective colloids and/or emulsifiers, characteriz...
Saved in:
Main Authors | , |
---|---|
Format | Patent |
Language | Chinese English |
Published |
09.02.2021
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | The invention relates to a method for cleaning a polymerization reactor for producing aqueous polymer dispersions by means of radical-initiated emulsion polymerization of one or more ethylenically unsaturated monomers in the presence of one or more protective colloids and/or emulsifiers, characterized in that: an aqueous mixture is placed in the polymerization reactor, which mixture contains one or more ethylenically unsaturated monomers and one or more protective colloids and/or emulsifiers, and does not contain an oxidation initiator, the proportion of the ethylenically unsaturated monomersbeing 20 to 70 wt.%, based on the total weight of the aqueous mixture; the aqueous mixture is then heated to a temperature of 50 DEG C to 100 DEG C and the polymerization reactor is treated for 5 minutes to 3 hours with the aqueous mixture; one or more initiators and optionally additional starting materials are then added; the polymerization is then initiated; and the aqueous polymer dispersion obtained thereby is removed |
---|---|
Bibliography: | Application Number: CN201980044330 |