PROCESS FOR PREPARING STABLE INORGANIC PIGMENT

PROCESS FOR PREPARING STABLE INORGANIC PIGMENT

Inorg. pigments stable to chems., H2S, light, weathering, heat and storage are prepd. by treating the pigments with aq. dispersions of alkali silicates contg. compds. reacting with them to form SiO2 sols, or acid gases at pH 7-11 and 70-100 C. Thus, 500 g aq. Na Silicate(4.83% SiO2, JIS NO 3) and 77...

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Bibliographische Detailangaben
Hauptverfasser: NOBUYOSHI ABE, SHOZO TAKATSU, KYOSHI KANAMARU
Format: Patent
Sprache:eng
Schlagworte:
ADHESIVES
CHEMISTRY
DYES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
PREPARATION OF CARBON BLACK
TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES
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Beschreibung
Zusammenfassung:Inorg. pigments stable to chems., H2S, light, weathering, heat and storage are prepd. by treating the pigments with aq. dispersions of alkali silicates contg. compds. reacting with them to form SiO2 sols, or acid gases at pH 7-11 and 70-100 C. Thus, 500 g aq. Na Silicate(4.83% SiO2, JIS NO 3) and 774 g 42 % NaHCO3 are added at 3.4 and 4.3 g/min, to a slurry of 100 g chrome yellow and 840g H2O stirred at 85-90 C and pH 9-10. When the pH reaches 6.5-7, the slurry is washed by decantation and dried to give 120g pigment with a fine, dense coating of amorphous SiO2.