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Polymers and Polymer Composites

MICROENCAPSULATION OF HYDROPHILIC SOLID POWDER AS A FIRE RETARDANT BY THE METHOD OF IN SITU GELATION IN DROPLETS USING A NON-AQUEOUS SOLVENT AS THE CONTINUOUS PHASE

February 1, 2009 By: Masanori Takahashi; Yoshinari Taguchi; Masato Tanaka Research article

Title: MICROENCAPSULATION OF HYDROPHILIC SOLID POWDER AS A FIRE RETARDANT BY THE METHOD OF IN SITU GELATION IN DROPLETS USING A NON-AQUEOUS SOLVENT AS THE CONTINUOUS PHASE
Page Range: p.83-90
Author(s): Masanori Takahashi; Yoshinari Taguchi; Masato Tanaka
File size: 521K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.2

Abstract
Hydrophilic, solid, powdery diammonium bitetrazole(BHT.2NH”3) as a fire retardant was microencapsulated with bisphenol-A epoxy resin by the method of in-situ gelation in droplets to give water resistance. In this method, a non-aqueous solvent was adopted as the continuous phase instead of water to prevent the hydrophilic core material from leaking out. In the experiment, it was mainly the agitation speeds during preparation of droplets containing BHT.2NH”3 and during the microencapsulation process, the gelation temperature, and the oil-soluble surfactant species that were varied. The content of core material could be increased by using a non-aqueous solvent instead of the water phase. The content of core material increased with gelation temperature and independently of the agitation speeds during first droplet preparation and during the microencapsulating process. The leakage ratio increased with agitation speeds and decreased considerably with gelation temperature. 10 refs.

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