Modified calcium carbonate with high specific surface area and preparation method thereof

The invention discloses a modified calcium carbonate with a high specific surface area. The modified calcium carbonate is characterized by being prepared from the following raw materials in parts by weight: 90 to 95 parts of calcium carbonate, 4 to 6 parts of methyl methacrylate, 5 to 7 parts of melamine resin, 3 to 4 parts of propanediol sebacate polyester, 2 to 3 parts of cocoanut active charcoal, 2 to 3 parts of coal ash, 1 to 1.5 parts of ammonium bicarbonate, 2 to 3 parts of turpentine, 1 to 2 parts of polysorbate 80 and 2.5 to 3.5 parts of modified titanium dioxide. Based on the improvement of a production process, the calcium carbonate has the good mechanical property; the modified titanium dioxide is added after the calcium carbonate is ground, so that the dispersion effect of the calcium carbonate is increased. The granularity of the modified calcium carbonate is refined, so that the modified calcium carbonate has the high specific surface area so as to increase an absorption effect. The modified cal