| abstract |
The invention discloses a preparation method of calcium-silicon core-shell structure nano-calcium carbonate, comprising the following steps: initially mixing a carbonated nano-calcium slurry and a silicate solution, and then performing high-speed dispersion and homogenization to obtain a mixed slurry B, the above-mentioned mixed slurry is reacted with the kiln gas containing carbon dioxide concentration to obtain the calcium-silicon core-shell structure nano-calcium carbonate crude product; C, the calcium-silicon core-shell structure nano-calcium carbonate crude product is mixed with modifier, Stirring to carry out the surface modification reaction; D. After the surface modification reaction is completed, carry out homogeneous stirring, and then carry out cooling and stirring; finally carry out dehydration, drying, and packaging to obtain a calcium-silicon core-shell structure nano-calcium carbonate product. The invention adopts the secondary coating technology to coat the nano calcium carbonate twice, improves the acid resistance of the nano calcium carbonate, improves the dispersibility of the product in the polymer, and makes the produced product suitable for polymer filling in a slightly acidic environment, It breaks the limitations of use and expands the scope of use. |