Process for preparing high-dispersibility white carbon black through hydrochloric acid precipitation method
A high-dispersity, silica technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of high degree of polymerization of silica, poor dispersibility, environmental pollution, etc., to achieve stable product quality, simple process technology, production low cost effect
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Embodiment 1
[0035] A method for preparing highly dispersible white carbon black by hydrochloric acid precipitation, comprising the following steps:
[0036] Add 100.0g sodium nitrate to 1000ml of sodium metasilicate solution with a concentration of 5%, stir well to obtain a mixed solution, slowly add hydrochloric acid with a concentration of 10% to the obtained mixed solution and stir at a speed of 120 rpm , until the pH of the reaction system=4, a precipitate was obtained, and then the obtained precipitate was aged at 60°C for 3 hours and then press-filtered, and the filter cake obtained by the press-filtration was washed three times with deionized water, and the washed filter cake Then dry at 150°C for 2 hours and grind to obtain 22.6g of white carbon black with a particle size of 153.3nm.
Embodiment 2
[0038] A method for preparing highly dispersible white carbon black by hydrochloric acid precipitation, comprising the following steps:
[0039] Add 200.0g of sodium nitrate to 1000ml of sodium metasilicate solution with a concentration of 10%, stir well to obtain a mixed solution, slowly add hydrochloric acid with a concentration of 20% to the obtained mixed solution and stir at a speed of 240 rpm , until the pH of the reaction system=7, a precipitate was obtained, and then the obtained precipitate was aged at 80°C for 1.5h and then press-filtered, and the filter cake obtained by the press-filtering was washed 5 times with deionized water, and the filtered The cake was then dried at 130°C for 3 hours and ground to obtain 45.5g of white carbon black with a particle size of 127.4nm.
Embodiment 3
[0041] A method for preparing highly dispersible white carbon black by hydrochloric acid precipitation, comprising the following steps:
[0042] Add 300.0g sodium nitrate to 1000ml of sodium metasilicate solution with a concentration of 15%, stir well to obtain a mixed solution, slowly add hydrochloric acid with a concentration of 30% to the obtained mixed solution and stir at a speed of 360 rpm , until the pH of the reaction system=9, the precipitate was obtained, and then the obtained precipitate was aged at 90°C for 1 hour and then press-filtered, and the filter cake obtained by the press-filtration was washed 7 times with deionized water, and the washed filter cake Then dry at 110°C for 4 hours and grind to obtain 67.4g of white carbon black with a particle size of 136.2nm.
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