Verfahren zur Herstellung farbbestaendiger TiO2/Al2O3-Pigmente
1,157,106. Titania-alumina pigment. E. I. DU PONT DE NEMOURS & CO. 18 Oct., 1966 [22 Oct., 1965], No. 46498/66. Heading ON. TiO-Al 2 O 3 pigment is coated with SiO 2 . An aqueous slurry containing 20-40% by wt. TiO 2 -Al 2 O 3 prepared by co-oxidation of TiCl 4 and AlCl 3 (the A1 2 0 3 content r...
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| creator | JOSEPH MCGINNIS,WILLIAMS |
| description | 1,157,106. Titania-alumina pigment. E. I. DU PONT DE NEMOURS & CO. 18 Oct., 1966 [22 Oct., 1965], No. 46498/66. Heading ON. TiO-Al 2 O 3 pigment is coated with SiO 2 . An aqueous slurry containing 20-40% by wt. TiO 2 -Al 2 O 3 prepared by co-oxidation of TiCl 4 and AlCl 3 (the A1 2 0 3 content ranging from 0 to 10% by wt. of the TiO 2 ) is heated to 40-70‹ C., and a solution of a water-soluble alkali metal silicate is added with agitation in an amount sufficient to provide 1 to 25% of SiO 2 based on the wt. of TiO 2 . The resultant mixture is aged for at least 30 mins. at pH of at least 9 at 40-70‹ C. and the pH is then reduced to not >6.5. Further ageing for at least 20 minutes at 40-70‹ C. is then carried out; the pigment coated with 5i0 2 is recovered, e.g. by filtration, and calcined at 300-1000‹ C. The initial silicate solution may be sodium silicate at 100-400 gms./1. |
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TiO-Al 2 O 3 pigment is coated with SiO 2 . An aqueous slurry containing 20-40% by wt. TiO 2 -Al 2 O 3 prepared by co-oxidation of TiCl 4 and AlCl 3 (the A1 2 0 3 content ranging from 0 to 10% by wt. of the TiO 2 ) is heated to 40-70‹ C., and a solution of a water-soluble alkali metal silicate is added with agitation in an amount sufficient to provide 1 to 25% of SiO 2 based on the wt. of TiO 2 . The resultant mixture is aged for at least 30 mins. at pH of at least 9 at 40-70‹ C. and the pH is then reduced to not >6.5. Further ageing for at least 20 minutes at 40-70‹ C. is then carried out; the pigment coated with 5i0 2 is recovered, e.g. by filtration, and calcined at 300-1000‹ C. 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Titania-alumina pigment. E. I. DU PONT DE NEMOURS & CO. 18 Oct., 1966 [22 Oct., 1965], No. 46498/66. Heading ON. TiO-Al 2 O 3 pigment is coated with SiO 2 . An aqueous slurry containing 20-40% by wt. TiO 2 -Al 2 O 3 prepared by co-oxidation of TiCl 4 and AlCl 3 (the A1 2 0 3 content ranging from 0 to 10% by wt. of the TiO 2 ) is heated to 40-70‹ C., and a solution of a water-soluble alkali metal silicate is added with agitation in an amount sufficient to provide 1 to 25% of SiO 2 based on the wt. of TiO 2 . The resultant mixture is aged for at least 30 mins. at pH of at least 9 at 40-70‹ C. and the pH is then reduced to not >6.5. Further ageing for at least 20 minutes at 40-70‹ C. is then carried out; the pigment coated with 5i0 2 is recovered, e.g. by filtration, and calcined at 300-1000‹ C. 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Titania-alumina pigment. E. I. DU PONT DE NEMOURS & CO. 18 Oct., 1966 [22 Oct., 1965], No. 46498/66. Heading ON. TiO-Al 2 O 3 pigment is coated with SiO 2 . An aqueous slurry containing 20-40% by wt. TiO 2 -Al 2 O 3 prepared by co-oxidation of TiCl 4 and AlCl 3 (the A1 2 0 3 content ranging from 0 to 10% by wt. of the TiO 2 ) is heated to 40-70‹ C., and a solution of a water-soluble alkali metal silicate is added with agitation in an amount sufficient to provide 1 to 25% of SiO 2 based on the wt. of TiO 2 . The resultant mixture is aged for at least 30 mins. at pH of at least 9 at 40-70‹ C. and the pH is then reduced to not >6.5. Further ageing for at least 20 minutes at 40-70‹ C. is then carried out; the pigment coated with 5i0 2 is recovered, e.g. by filtration, and calcined at 300-1000‹ C. The initial silicate solution may be sodium silicate at 100-400 gms./1.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | 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 |
| title | Verfahren zur Herstellung farbbestaendiger TiO2/Al2O3-Pigmente |
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