Preparation method of superfine active calcium carbonate functional filler special for PVC

The invention discloses a preparation method of a superfine active calcium carbonate functional filler special for PVC. The method includes the main steps of: introducing kiln gas into a high concentration calcium hydroxide slurry to conduct rapid carbonization, then adding heavy calcium carbonate powder accounting for 20-30% of the weight of synthetic calcium carbonate to prepare a mixed slurry of calcium carbonate, employing a vertical bead mill to perform grinding, mixing the grinded slurry with a high polymer emulsion, and under the high shear emulsification action of a homogenization pump, making calcium carbonate dispersion and high polymer emulsion cladding finished synchronously, finally carrying out filtration and drying, thus obtaining the product. The prepared product has a particle size distribution in the range of 1.0-1.5 micrometers, an activation degree over 99%, an oil absorption value less than 15g/100gCaCO3, and is free of agglomeration phenomenon, thus being able to serve as a functional fi