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, and/or acid gases, at pH 8-11 and 60 C. Thus, 500 g aq. Na silicate (4.83% SiO2) and 471 g 2.7...

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Bibliographische Detailangaben
Hauptverfasser:	NOBUYOSHI ABE, SHOZO TAKATSU, KYOSHI KANAMARU
Format:	Patent
Sprache:	eng ; kor
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, and/or acid gases, at pH 8-11 and 60 C. Thus, 500 g aq. Na silicate (4.83% SiO2) and 471 g 2.74% HCO2H are added at 3.4 and 2.6 g/min, resp., to a slurry of 100 g chrome yellow and 840 g 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 at 110 Cto give 120 g pigment with a fine, dense coating of amorphous SiO2 with excellent ratings in tests for resistance to acids, alkalies, and H2S.