| As an important filler and pigment, Calcium carbonate is widely used in paper-making industry. PCC fillers which made by our tradition ways are good for low quality paper making in small and medium-sized factory, but they can not catch up with the high development speed of paper making industry of China. We need high level CaCO3 with high brightness, high content, high dispersion coefficient, suitable granularity distribution, low abrasion, stable PH value, chemical resistant, easier pigmentation ect. The detail is as followed:According to carbonation way, we use polyacrylic acid as the organic template, which can efficiently interact with calcium carbonate crystal, to control the polymorphs and the morphologies of calcium carbonate. The final product is calcite calcium carbonate and it is good to be fillers for paper making which can improve paper strength. Also, needle-like crystal can improve paer mechanical quality; the soomth needle surface can reach better paper surface. Hollow CaCO3 microspheres were successfully synthesized through the precipitation reaction in the presence of polyacrylic acid (PAA) and sodium dodecyl sulfonate (SDS) and the"core-shell model"of PAA/SDS micellar aggregates serves as the spherical templates to generate hollow microspheres of CaCO3 crystals in the precipitation system. This produce can improve paper heat resistant, keep the paper density and reach better smooth paper surface. CaCO3 nanoparticles with about 50 nm in size could be prepared by carbonation reaction of a mixture of Ca(OH)2 and dodecyl dimethyl betaine (BS-12) via bubbling CO2 gas. The results indicate that the CaCO3 powder samples can self-diffuse in water, thus forming a suspension with enhanced stability and longevity. The product can impove paper color and ink absorbability.
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