Silica for low-viscosity and high-transparency friction toothpaste and preparation method thereof
A silicon dioxide, low viscosity technology, applied in silicon dioxide, silicon oxide, chemical instruments and methods, etc., can solve the problems of high energy consumption and high reaction temperature, achieve low reaction temperature, high reaction yield, and reduce production costs Effect
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Embodiment 1
[0026] Embodiment 1. Silica for low-viscosity and high-transparency friction toothpaste of the present invention and its preparation method
[0027] S1, adding 10m of sodium sulfate solution with a mass percentage concentration of 11.0% in the reaction tank 3 , then heat up to 35°C, start stirring and control the stirring speed to 25Hz;
[0028] S2, while stirring, dropwise add 22m of sodium silicate solution with a concentration of 2.0mol / L 3 And concentration is the sulfuric acid solution of 7.5mol / L, the dripping flow rate of controlling sodium silicate solution is 13.0m 3 / h, the dripping flow rate of sulfuric acid solution is 3.5m 3 / h, keep the pH value of the process at 7.5, when the amount of sodium silicate solution added reaches 12m 3 , add the silane coupling agent acid solution, after the sodium silicate solution is added dropwise, continue to drop the sulfuric acid solution until the pH value is 3.5, stop adding acid, and age for 1h;
[0029] S3. Press-filter,...
Embodiment 2
[0031] Embodiment 2. Silica for low-viscosity and high-transparency friction toothpaste of the present invention and its preparation method
[0032] S1, adding 12m of sodium sulfate solution with a mass percentage concentration of 13.5% in the reaction tank 3 , then heat up to 40°C, start stirring and control the stirring speed to 35Hz;
[0033]S2, while stirring, dropwise add 24m of sodium silicate solution with a concentration of 2.5mol / L 3 And concentration is the sulfuric acid solution of 8.5mol / L, the dripping flow rate of controlling sodium silicate solution is 14.0m 3 / h, the dripping flow rate of sulfuric acid solution is 3.0m 3 / h, keep the pH value of the process at 8.5, when the amount of sodium silicate solution added reaches 15m 3 , add the silane coupling agent acid solution, after the sodium silicate solution is added dropwise, continue to drop the sulfuric acid solution until the pH value is 5.5, stop adding acid, and age for 2 hours;
[0034] S3. Press-fil...
Embodiment 3
[0037] Example 3. Silica for low-viscosity and high-transparency friction toothpaste of the present invention and its preparation method
[0038] S1, adding 11m of sodium sulfate solution with a concentration of 12.0% in the reaction tank 3 , then heat up to 35°C, start stirring and control the stirring speed to 30Hz;
[0039] S2, while stirring, dropwise add 24m of sodium silicate solution with a concentration of 2.5mol / L 3 and a sulfuric acid solution with a concentration of 8.0mol / L, the dripping flow rate of the sodium silicate solution is controlled to be 13.5m 3 / h, the dripping flow rate of sulfuric acid solution is 3.0m 3 / h, keep the pH value of the process at 8.0, when the amount of sodium silicate solution added reaches 14m 3 , add the silane coupling agent acid solution, after the sodium silicate solution is added dropwise, continue to drop the sulfuric acid solution until the pH value is 4.5, stop adding acid, and age for 1h;
[0040] S3. Press-filter, wash, a...
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