COMPOSITE MATERIALS OF MAGNETIC CLUSTER TYPE COVERED WITH MULTIPLE INORGANIC LAYERS

The invention relates to a process for preparing a magnetic composite material for manufacturing security materials. According to the invention, the process consists in the synthesis of some magnetic clusters which are covered with a first inorganic layer of barium sulphate, after which they are sub...

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Bibliographische Detailangaben
Hauptverfasser:	CÎRCU MONICA VIOLETA, TURCU RODICA PAULA, PETRAN ANCA CRISTINA
Format:	Patent
Sprache:	eng ; rum
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CORRECTING FLUIDS DYES FILLING PASTES INKS INORGANIC CHEMISTRY METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES PREPARATION OF CARBON BLACK TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	The invention relates to a process for preparing a magnetic composite material for manufacturing security materials. According to the invention, the process consists in the synthesis of some magnetic clusters which are covered with a first inorganic layer of barium sulphate, after which they are subjected to a reaction with tetraethyl orthosilicate in admixture with ethanol, water and ammonia, at the room temperature, for 3 h, while continuously magnetically stirring, the resulting particles are magnetically separated, washed and dried, resulting in a composite material of cluster-type covered with double inorganic layer of FeO/BaSO/SiO-type, with a saturation magnetization value Ms of 20 emu/g.