Preparation method for efficient calcium carbonate dispersing agent

Abstract

The invention provides a preparation method for an efficient calcium carbonate dispersing agent, which comprises the following steps: (1) reacting a low-valence transitional metal halide with 2,2'-bipyridine in a solvent in the absence of oxygen to obtain a uniform complex solution; (2) adding a vinyl carboxylic ester monomer and an initiator of halogenated hydrocarbon into the product resulting from the step (1) and reacting the mixture; (3) passing the product resulting from the step (2) through a column to remove the transitional metal halide, collecting the solution passing through the column, mixing the collected solution with a sodium hydroxide solution, hydrolyzing the mixed solution, distilling the mixed solution to remove the solvent and the side product alcohol, adding the NaOH solution to regulate the pH of the mixed solution and adding water to regulate the solid content by weight, then obtaining the efficient calcium carbonate dispersing agent. The calcium carbonate dispersing agent with high dispersion efficiency obtained by the method can be applied in the grinding and the dispersion of calcium carbonate.

Description

technical field

[0001] The invention relates to an ultrafine calcium carbonate high-efficiency dispersant and a preparation method thereof. Background technique

[0002] As a very important inorganic chemical filler, calcium carbonate is widely used in the production, processing and application of papermaking, paint, rubber, plastic, ink, medicine, food, feed, cosmetics, etc. Its main function is to increase the volume of the product, reduce the production cost, and improve the processing performance of the product. With the improvement of people's requirements for product quality, the requirements for the fineness and uniformity of calcium carbonate and the solid content of calcium carbonate slurry are also increasing. The finer the calcium carbonate particle size and the higher the solid content, the higher the viscosity during grinding, and the stronger the anti-sticking after grinding. Therefore, it is necessary to add a dispersant when grinding and dispersing calcium c...

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