Method for the continuous preparation of organopolysiloxane emul

Details Method for the continuous preparation of organopolysiloxane emul Method for the continuous preparation of organopolysiloxane emul

1996-02-05

1997-09-09

Glass, Margaret W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523348, 523324, 524837, 524588, 524858, 524860, 252349, 252314, 366295, C08J 303

Patent

active

056657960

ABSTRACT:
Method and apparatus for preparing uniform highly dispersed emulsions by using a low drive power and without pressurization, making possible continuous mass production of uniform organopolysiloxane emulsions. An organopolysiloxane, water and a emulsifying agent, are continuously fed across a first-stage shearing and stirring mechanism and a second-stage shearing and stirring mechanism. The first-stage mechanism is a stator and turbine-type rotor whose blades are slanted obliquely from the radial direction when viewed from the axial direction. The second-stage mechanism is a stator and turbine-type rotor whose blades describe spiral curves with respect to the axial direction. The two mechanisms are arranged serially and separated from one another by a relaxation zone. Emulsification is carried out in the first-stage mechanism by an intake and shearing action at a shear rate of at least 100/second, and in the second-stage mechanism by a phase reversal rotating effect and shearing action at a shear rate of at least 100/second.

REFERENCES:
patent: 3623703 (1971-11-01), Nielander
patent: 4668717 (1987-05-01), Lemstra et al.
patent: 4687339 (1987-08-01), Seeger
patent: 4792238 (1988-12-01), Yoneyama et al.
patent: 4814376 (1989-03-01), Tanaka et al.
patent: 4824877 (1989-04-01), Glover et al.

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