Method for the preparation of expanded thermoplastic microspheres, and device for the expansion of the thermally expandable thermoplastic microspheres unexpanded

摘要

Summary the method for the preparation of expanded thermoplastic microspheres.And the device for the expansion of thermally expandable thermoplastic microspheres not expanded, the present invention relates to a method and a device for the preparation of thermoplastic microspheres expanded thermally expandable thermoplastic microspheres not expand Trips including a shell of thermoplastic polymer, which encapsulates a blowing agent.The method comprises: (a) the feeding of a slurry of such expandable thermoplastic microspheres in a liquid medium in a heating zone; (b) heating the slurry in the heating zone, without direct contact with any means of heat transfer fluid, thus,The expandable microspheres reach at least a temperature in which they had begun to expand into atmospheric pressure, and maintaining a pressure in the heating zone high enough so that the microspheres in the slurry does not expand completely; and (c) the withdrawal of the P. ASTA fluid expandable microspheres in the heating zone into a zone with an adequate pressureOften low to the microspheres expand. 1 / 1