Study on modification of calcium carbonate for paper filler

Using silane coupling agent and ammonium zirconium carbonate to modify heavy calcium carbonate separately. Experiments show that using modified calcium carbonate as a filler made of significantly higher than filling in terms of the physical strength of paper. Under 40 degrees SR condition, after 1% ammonium zirconium carbonate complex of 4% oxidized starch modified calcium carbonate which works best, to which tensile index up 74.5 N. m / g, while the filling GCC is 54.9 N. m / g. Through the ash of calcium carbonate filler finding that retention of modified is higher than unmodified, from 31.35 % to 45.94%.