| 摘要 |
PURPOSE: A nano-sized calcium carbonate(CaCO3) dispersed in water is provided, which has stability during diluting, heating and long-term by adsorbing polymer dispersant to the surface of ground CaCO3. CONSTITUTION: The CaCO3-dispersed solution is prepared by the following steps of: mixing 100pts.wt. of water, 1-50pts.wt. of CaCO3(0.001-10micrometer size) and 0.1-20pts.wt. of polymer dispersant; putting microbeads(0.1-3mm size), made of glass, ZrO2, Zr, TiO2 or CeO2, to the CaCO3 solution; milling mixtures in a metal or TiO2(or CeO2)-coated vessel(9) with an disk-shaped impeller(7) at a rate of 500-2000rpm, wherein the impeller reduces heat formed in stirring to prevent dispersed CaCO3 from agglomerating. The polymer dispersant having carboxylic group, 1-700 of degree of polymerization and 3,000-80,000 of molecular weight, is acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, alpha-hydroxyacrylic acid, crotonic acid, homopolymer thereof or copolymer thereof. |
