公开(公告)号：US3650979A

公开(公告)日：1972-03-21

申请号：US3650979D

申请日：1968-05-16

Applicant: BAYER AG

Inventor： STEINBACH HANS-HORST ,  THEUER WERNER ,  SCHNURRBUSCH KARL

IPC: B01D19/04 ,  B01D17/00

CPC classification number: B01D19/0409 ,  B01D19/0422 ,  B01D19/0454

Abstract: A STABLE DEFOAMING AGENT WHICH IS VERY EFFECTIVE IN AQEOUS SYSTEMS IS PREPARED ACCORDING TO THE INVENTION BY EMULSIFYING, IN 100 TO 10,000 PARTS BY WEIGHT OF WATER, 100 PARTS BY WEIGHT OF AN A,W-BIS-(TRIMETHYLSILOXY)-POLYDIMETHYL-SILOXANE HAVING A VISCOSITY BETWEEN 500 AND 5000 CENTISTOKES AT 20*C., 1 TO 15 PARTS BY WEIGHT OF FINELY DIVIDED SILICA AND 20 TO 40 PARTS BY WEIGHT OF AN EMULSIFIER CONSISTING OF A POLYGLYCOL ETHER OR A FATTY ACID ESTER THEREOF OR OF AN ALKYL- OR ARYL-SULPHATE OR -SULPHO NATE, AND ADMIXING THE EMULSION SO OBTAINED WITH 100 TO 500 PARTS BY WEIGHT OF A FATTY ACID ESTER OF HYDROXYETHANE-SULPHONIC ACID OR AN ALKALI METAL SALT THEREOF.