The modification of nanometer calcium carbonate mainly adopts wet modification. Specifically, dispersing agent and surfactant are added to the nanometer calcium carbonate slurry. The nanometer calcium carbonate particle size and surface activation rate are controlled by the process. Finally, dehydration, drying, crushing and After classification, modified nano calcium carbonate is obtained.

At present, the most commonly used and most effective surfactants are mainly fatty acid organic compounds. One end of this type of compound molecule is a carboxyl group, an ether group, and other polar groups, which can undergo physical-chemical adsorption or chemical reaction with the surface of calcium carbonate particles to form a stable bridge structure. The other end of the molecule is a long-chain alkyl structure. Similar to polymer molecules, so it has good compatibility with organic polymers. After surface modification of nanometer calcium carbonate, the interface binding force between nanometer calcium carbonate particles and organic polymers can be greatly enhanced, and the oil absorption value of nanometer calcium carbonate can be effectively reduced, and the viscosity of the nanometer calcium carbonate / organic polymer system can be reduced. Improve dispersibility and increase the amount of additives.