Preparation method for acrylic copolymer ground calcium carbonate ultrafine powder

The invention provides a preparation method for acrylic copolymer ground calcium carbonate ultrafine powder. The preparation method is characterized in that ground calcium carbonate coarse powder is added into a grinding device; at a temperature between 85 DEG C to 95 DEG C, 10 to 12 percent of an additive is added according to the weight percentage of the ground calcium carbonate coarse powder, and the modified ultrafine calcium carbonate powder with a particle diameter between 0.1 micron to 10 microns are obtained through high-speed grinding; the additive includes the following components by weight: 2 to 3 parts of an acrylic vinylpyridine copolymer, 2 to 3 parts of ethyoxyl lauramide, 2 to 3 parts of an aluminic acid ester coupling agent, 5 to 8 parts of sodium carbonate, and 5 to 8 parts of glycol. The preparation method has the advantages of being scientific and reasonable in design, simple in technique, safe, reliable, easy to control, convenient to operate, suitable for large-scale production, low in production cost, and the like.