Preparation method of silicon dioxide
A technology of silicon dioxide and precipitated silicon dioxide, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of increasing the complexity of the process, hidden dangers of safety, increasing the manufacturing cost, and the effect is not ideal.
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Embodiment 1
[0044] Step 1. Add 383ml of water, 15ml of sodium silicate (M=3.60, concentration 25%) solution and 10g of sodium hexametaphosphate into a 1000ml glass flask equipped with stirring, heat the material temperature to 90°C on a water bath, and the pH of the solution=10.5 ±0.1;
[0045] Step 2.174ml of sodium silicate solution (M=3.60, concentration 25%) was added to the above material in 25 minutes, and concentrated sulfuric acid (98%) was added at the same time to keep the pH of the reaction material=10.5±0.1;
[0046] Step 2.2111ml of sodium silicate solution was added to the above material in 25 minutes, and concentrated sulfuric acid (98%) was added simultaneously to keep the pH of the reaction material=10.5±0.1;
[0047] Step 2.3185ml of sodium silicate solution was added to the above-mentioned material in 40 minutes, and concentrated sulfuric acid (98%) was added simultaneously to keep the pH of the reaction material=10.5±0.1;
[0048] Step 3. stop adding sodium silicate s...
Embodiment 2
[0057] Repeat Example 1, only change the "Cetyltrimethylammonium Chloride" in Step 4 of Example 1 into fatty alcohol polyoxyethylene ether.
[0058] The suspension was vacuum filtered using a Buchner funnel and washed with 3000 ml of water. The filter cake was dried in an oven at 105°C until the moisture content was lower than or equal to 5.0%, and a white powdery precipitated silica was obtained which was crushed by hand.
[0059] Filtration time is 20 minutes and washing time is 75 minutes.
[0060] The conductivity of the product precipitated silica aqueous suspension is 180 μs / cm.
[0061] The particle size of the product precipitated silica (ultrasonic treatment for 2 minutes, measured by a laser particle size analyzer) is 14 μm.
[0062] White precipitated silica is mixed with silicone rubber raw rubber, and after secondary vulcanization, it is visually inspected for yellowing, and there is no yellowing. The film has no white spots, that is, the dispersibility is good...
Embodiment 3
[0064] Repeat Example 1, only adjust pH=10.5±0.1 in each step of Example 1 to pH=9.0±0.1.
[0065] The suspension was vacuum filtered using a Buchner funnel and washed with 3000 ml of water. The filter cake was dried in an oven at 105°C until the moisture content was lower than or equal to 5.0%, and a white powdery precipitated silica product was obtained which was crushed by hand.
[0066] Filtration time is 15 minutes and washing time is 65 minutes.
[0067] The conductivity of the product precipitated silica aqueous suspension is 160 μs / cm.
[0068] The particle size of the product precipitated silica (ultrasonic treatment for 2 minutes, measured by a laser particle size analyzer) is 13 μm.
[0069] White precipitated silica is mixed with silicone rubber raw rubber, and after secondary vulcanization, it is visually inspected for yellowing, and there is no yellowing. The film has no white spots, that is, the dispersibility is good.
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