Preparation process of nanoscale calcium carbonate for automobile coating

• Main Author: LIU YAXIONG
• Format: Patent
• Language: Chinese; English
• Published: 12.04.2024
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; INORGANIC CHEMISTRY; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; PREPARATION OF CARBON BLACK; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; USE OF MATERIALS THEREFOR; WOODSTAINS

The invention discloses a preparation process of nano calcium carbonate for an automobile coating, and relates to the field of nano calcium carbonate preparation, and the preparation process comprises the following steps: diluting lime milk to obtain lime milk raw slurry; the lime milk raw slurry and a first crystal form control agent are sent to a carbonization reaction kettle, and carbon dioxide mixed gas is introduced for a first carbonation reaction; stopping introducing gas when the pH value is less than or equal to 7.5 in the first carbonation reaction, aging for 4-6 hours, putting a second crystal form control agent into the carbonation reaction kettle, continuously introducing the carbon dioxide mixed gas to carry out second carbonation reaction, and stopping introducing gas when the pH value is less than or equal to 7 in the second carbonation reaction to obtain a calcium carbonate suspension; feeding the calcium carbonate suspension and a compound surface treating agent into a modification kettle fo