Method for preparing core-shell silicon dioxide coated nano calcium carbonate
A technology of nano-calcium carbonate and silica, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems such as poor dispersion, serious agglomeration, and restricted application fields, and achieve good dispersion and processing performance , good acid resistance and dispersibility, easy for industrial production
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Embodiment 1
[0026] In a 30 cubic meter reactor, 25 cubic meters of nano-calcium carbonate slurry (the weight solid content of calcium carbonate is 13.2%, and the average particle diameter of calcium carbonate is 50 nanometers) that has been carbonized to pH equal to 7 is added. Be 300 kilograms of water glass (silica weight content is 25%) of 3.1, under the circulation action of high-shear emulsification pump, control reaction temperature is 30 ℃, feed the kiln gas of carbon dioxide volume content 28% and carry out carbonization to pH It is 6.8. Under the action of carbon dioxide gas, the silicate is hydrolyzed to form silica sol, which is evenly coated on the surface of nano-calcium carbonate, forming a layer of core-shell silicon dioxide coated on nano-calcium carbonate. Add titanate coupling agent TC-311 (35 kg of TC-311 dissolved in 800 kg of water to make a coating agent solution) to the slurry for surface treatment to obtain core-shell silica coated with nano-active carbonic acid Ca...
Embodiment 2
[0030] In the reactor of 30 cubic meters, 25 cubic meters of nano-calcium carbonate slurry (the weight solid content of calcium carbonate slurry is 12.9%, and the average particle diameter of calcium carbonate is 100 nanometers) equal to 7 to PH, add partial Calcium silicate 80 kg, under the circulation of high-shear emulsification pump, the reaction temperature is controlled at 25.0 ° C, and the kiln gas with a carbon dioxide volume content of 29% is introduced for carbonization until the pH is 7.0, and the silicate is under the action of carbon dioxide gas. , hydrolyzed silica sol, and evenly coated on the surface of nano-calcium carbonate, forming a layer of core-shell silica coated on nano-calcium carbonate. Add emulsified stearic acid coating solution (90 kg of stearic acid dissolved in 1500 kg of hot water, and add 80 kg of 40% liquid caustic soda to emulsify and dissolve) in the slurry for surface treatment to obtain the core shell Shaped silicon dioxide is coated on na...
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