Method for preparing black iron oxide wrapped with silicon dioxide
A technology of iron oxide black and silicon dioxide, applied in chemical instruments and methods, dyeing polymer organic compound treatment, inorganic pigment treatment, etc., can solve the problems of poor dispersion stability, poor anti-flocculation, poor water resistance, etc., and achieve tinting strength High, improved water resistance, high weather resistance effect
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[0014] A preparation method of silicon dioxide coated iron oxide black, comprising the following steps:
[0015] (1) Add ferrous sulfate and deionized water into the reaction kettle according to the mass ratio of 1:2, heat to 75°C, and stir evenly to completely dissolve the ferrous sulfate;
[0016] (2) Add a sodium hydroxide solution with a mass concentration of 15% to the ferrous sulfate solution for neutralization; the pH value is controlled at 8 to obtain a ferrous hydroxide gel;
[0017] (3) When the ferrous hydroxide gel prepared above is passed through steam and heated to 90°C, the ventilation volume is 0.6m 3 Air was blown in per minute for oxidation reaction. During the reaction, the temperature was 95°C and the pH value was 8. After the reaction, the precipitated black particles were collected, washed, dried, and pulverized by conventional methods to obtain iron oxide black;
[0018] (4) Weigh 10% tetraethyl orthosilicate of iron oxide black, dissol...
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