Compositions – Preservative agents – Anti-corrosion
Patent
1981-11-02
1984-05-29
Padgett, Benjamin R.
Compositions
Preservative agents
Anti-corrosion
B01J 1300
Patent
active
044513887
ABSTRACT:
New alumina coated silica sols are produced by a method which comprises mixing a concentrated deionized silica sol with concentrated solutions of trivalent acid aluminum salts, heating this premix to at least 90.degree. C. for 1-15 minutes to form an alumina reacted silica sol solution, cooling this reacted silica sol solution to form a cooled alumina reacted silica sol solution, diluting with deionized water to about 10 weight percent solids, exposing this diluted alumina reacted silica sol to ultrafiltration through a membrane having a molecular weight cutoff of about 30,000, adding distilled or deionized water to the diluted alumina reacted silica sol during ultrafiltration to wash dissolved salts from this salt solution forming a diluted alumina-coated silica sol having a pH between about 4-5 and a conductivity between about 2,000-4,000 micromhos, concentrating this dilute alumina-coated silica sol to at least 30 weight percent solids, thereby obtaining a stable alumina-coated silica sol.
REFERENCES:
patent: 3560400 (1971-02-01), Chilton
patent: 3864142 (1975-02-01), Kovarils
patent: 3969266 (1976-07-01), Iler
Brookes Anne
Epple Donald G.
Miller Robert A.
Nalco Chemical Company
Padgett Benjamin R.
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