A kind of aluminum modified acidic silica sol and its preparation method and application
A technology for modification of acidic silica sol and aluminum, which is applied in the field of silicon materials, can solve the problems of insignificant improvement of the purity of acidic silica sol and limited degree of improvement, and achieve increased specific surface area, enhanced functional performance, and improved modification degree Effect
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Embodiment 1
[0052] This embodiment provides an aluminum-modified acidic silica sol, the preparation method of which is:
[0053] (1) dissolving aluminum sulfate in water to make a mass fraction of 5% aluminum sulfate aqueous solution;
[0054] (2) Add the aqueous aluminum sulfate solution obtained in step (1) dropwise at a rate of 50 mL / min into the freshly prepared 3Be active silicic acid solution (obtained by exchanging water glass with a strong-acid cationic resin activated by sulfuric acid), so that the aluminum The salt is dispersed in a silicic acid solution, and a silicic acid solution having a molar ratio of aluminum atoms to silicon atoms of 0.004:1 is prepared;
[0055] (3) Add the aluminum-containing silicic acid solution and the alkaline stabilizer (4% aqueous sodium hydroxide solution) obtained in step (2) dropwise into the alkaline bottom solution (sodium hydroxide solution at pH=12) (containing The volume ratio of the aluminosilicate solution, the alkaline stabilizer, and ...
Embodiment 2
[0059] This embodiment provides an aluminum-modified acidic silica sol, the preparation method of which is:
[0060] (1) dissolving aluminum nitrate in water to make massfraction is 3% aluminum nitrate aqueous solution;
[0061] (2) Add the aluminum nitrate aqueous solution obtained in step (1) dropwise into the freshly prepared 2Be active silicic acid solution (obtained by exchanging water glass with a strong-acid cationic resin activated by sulfuric acid) at a rate of 40mL / min, so that the aluminum The salt is dispersed in a silicic acid solution, and a silicic acid solution having a molar ratio of aluminum atoms to silicon atoms of 0.002:1 is prepared;
[0062] (3) Add the aluminum-containing silicic acid solution and the alkaline stabilizer (2% aqueous sodium hydroxide solution) obtained in step (2) dropwise into the alkaline bottom solution (sodium hydroxide solution at pH=9) (containing The volume ratio of the aluminosilicate solution, the alkaline stabilizer and the al...
Embodiment 3
[0066] This embodiment provides an aluminum-modified acidic silica sol, the preparation method of which is:
[0067] (1) dissolving alum in water to make massfraction is 7% alum aqueous solution;
[0068] (2) Add the alum aqueous solution obtained in step (1) dropwise into the freshly prepared 4.5Be active silicic acid solution (obtained by exchanging water glass with a strong acid cationic resin activated by sulfuric acid) at a rate of 60mL / min to make aluminum The salt is dispersed in a silicic acid solution, and a silicic acid solution having a molar ratio of aluminum atoms to silicon atoms of 0.006:1 is prepared;
[0069] (3) Add the aluminum-containing silicic acid solution and alkaline stabilizer (6% aqueous sodium hydroxide solution) obtained in step (2) dropwise into the alkaline bottom solution (sodium hydroxide solution at pH=14) (containing The volume ratio of the aluminosilicate solution, the alkaline stabilizer and the alkaline base solution is 10:0.3:5), the tem...
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