Modified calcium carbonate with excellent acid resistance and preparation method thereof

The invention discloses modified calcium carbonate with the excellent acid resistance and a preparation method thereof. The modified calcium carbonate is characterized by comprising, by weight, 100 parts to 150 parts of calcium carbonate, 30 parts to 50 parts of sodium oleate, 0.3 part to 0.7 part of sodium dodecyl benzene sulfonate, 1 part to 3 parts of sodium bicarbonate, 4 parts to 8 parts of styrene, 0.02 part to 0.05 part of potassium persulfate, 3 parts to 5 parts of fumed silica, 2 parts to 3 parts of organobentonite, 2 parts to 3 parts of zirconium tetrafluoride, 1 part to 3 parts of epoxy castor oil, 2 parts to 3 parts of sodium tripolyphosphate, 3 parts to 5 parts of shell powder and a proper amount of deionized water. According to the modified calcium carbonate, as the added zirconium tetrafluoride, the added epoxy castor oil, the added sodium tripolyphosphate and the added shell powder are cooperatively used, the calcium carbonate is good in acid resistance and adsorbability, resistant to bacteria, capable of achieving bacteriostasis, resistant to ultraviolet rays and good in heat resistance and light resistance; the modified calcium carbonate can be crosslinked with film forming matter in rubber, plastics and coatings to generate the good surface decoration effect, the performance of a product can be improved, and the modified calcium carbonate is green, safe and worthy of popularization.