METHOD AND DEVICE FOR PREPARATION OF EXPANDED MICROSPHERES Russian patent published in 2018 - IPC C04B20/06 B29C44/44 B01J13/00 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to a method for producing foamed thermoplastic microspheres and a device for their production. Method for producing foamed thermoplastic microspheres from non-foamed thermally foaming thermoplastic microspheres comprising a shell of a thermoplastic polymer, an encapsulating blowing agent, includes feeding a slurry of foaming thermoplastic microspheres in a liquid medium to a heating zone, heating of the suspension in the heating zone, without direct contact with the medium of the heat carrier, until the foamable microspheres reach a temperature of 50 to 250 °C, and maintaining the pressure in the heating zone from 4 to 50 bar (0.4 to 5 MPa) so that the microspheres in the slurry do not foam completely, removal of the suspension of the expandable microspheres from the heating zone to the pressure zone, sufficiently low for the microspheres to foam. Group of inventions is developed in the dependent claims of the invention.

EFFECT: foaming the microspheres in suspension without the need for introducing excess water.

34 cl, 1 dwg, 2 ex