The precipitated calcium carbonate is modified by a chelating titanate coupling agent, and the modified product is calcined at 550 ° C to obtain a modified calcium carbonate. The modified calcium carbonate was used as a papermaking filler. The whiteness of the paper increased slightly, the mechanical properties decreased to a certain extent, and the retention rate of the filler did not change significantly.

　　The titanate coupling agent reacts with the surface hydroxyl group of the inorganic substance to enable the filler to be activated. Therefore, in the plastics industry, it is often used to couple thermoplastic polymers and dry fillers, thereby increasing the filling amount, reducing the amount of resin, reducing the cost of the product, improving the processing performance, increasing the gloss of the product, and improving the product quality. The strength of paper mainly comes from the interaction of hydrogen bonds between cellulose molecules. What kind of effect will it be applied to papermaking?