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Preparation method for efficient calcium carbonate dispersing agent

A dispersant, calcium carbonate technology, applied in chemical instruments and methods, dyed polymer organic compound treatment, fibrous fillers, etc., can solve the problems of lower utilization efficiency of dispersant and precipitation

Active Publication Date: 2012-11-14
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research results of J.Loiseau [Macromolecules 2003, 36, 3066-3077] show that sodium polyacrylate close to molecular weight monodisperse has better dispersion than polydisperse sodium polyacrylate, and the former can be irreversibly adsorbed to calcium carbonate particles completely The surface of calcium carbonate can be well dispersed; while the latter can only be partially selectively adsorbed on the surface of calcium carbonate particles, the utilization efficiency of the dispersant is greatly reduced, and precipitation will occur

Method used

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  • Preparation method for efficient calcium carbonate dispersing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of sodium polyacrylate with low molecular weight and narrow distribution:

[0027] Add 4.45g of CuCl to the reaction kettle, add 300g of toluene after sufficient nitrogen to drive away oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 14g of 2,2'-bipyridine, and raise the temperature to 50°C for 1 hour under the protection of nitrogen. A homogeneous complex solution was obtained.

[0028] A mixture of 320 g of tert-butyl acrylate monomer and 4.9 g of ethyl bromide initiator was added, the temperature was raised to 100° C., and the mixture was reacted with nitrogen at constant temperature for 5 hours. After passing through the alumina column to remove the transition metal halides, the resulting solution was mixed with 70 g of sodium hydroxide solution (32% by weight), and then hydrolyzed at 120° C. for 3 hours to convert tert-butyl polyacrylate into sodium polyacrylate. The solvent and tert-butanol by-product were distilled off. Add 5...

Embodiment 2

[0031] Preparation of sodium polymethacrylate with low molecular weight and narrow distribution:

[0032] Add RhCl to the reactor 2 8.46g, add 350g of benzene after sufficient nitrogen to drive oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 26.6g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a uniform complex solution . A mixture of 355 g of tert-butyl methacrylate monomer and 9.31 g of ethyl bromide initiator that has been driven by nitrogen to drive oxygen was added, the temperature was raised to 100° C., and the mixture was reacted by nitrogen at a constant temperature for 5 hours. After passing through the alumina column to remove the transition metal halide, the resulting solution was mixed with 70 g of sodium hydroxide solution (weight concentration 32%), and then hydrolyzed at 140 ° C for 4 hours to convert poly-tert-butyl methacrylate into polymethacrylic acid sodium. The ...

Embodiment 3

[0035] Preparation of low molecular weight narrow distribution poly(sodium acrylate-co-sodium methacrylate):

[0036] FeCl was added to the reactor 2 6.23g, add 350g of ethyl acetate after sufficient nitrogen to drive away oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 19.6g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a uniform compound substance solution. Add a mixture of 337.5 g of tert-butyl methacrylate and tert-butyl acrylate monomer mixture and 6.86 g of ethyl bromide that have been driven by nitrogen to drive oxygen, raise the temperature to 100° C., and react with nitrogen at a constant temperature for 5 hours. After the transition metal halides were removed through an alumina column, the resulting solution was mixed with 70 g of a sodium hydroxide solution (32% by weight), and then hydrolyzed at 120° C. for 5 hours to convert the copolycarboxylate into sodium polycarboxyl...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/18C08F8/44C08F8/12C08F220/18B01F17/52C09C1/02C09C3/04C09C3/10C09K23/52
Inventor 施晓旦金霞朝王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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