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Preparation method and application of high-efficiency 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: 2011-05-11
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research result of J.Loiseau[Macromolecules2003,36,3066-3077] shows, the sodium polyacrylate close to molecular weight monodisperse has better dispersing effect than the polydisperse sodium polyacrylate, and the former can irreversibly all be adsorbed to the calcium carbonate particle surface, so as to well disperse calcium carbonate; while the latter can only be partially selectively adsorbed to 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 and application of high-efficiency calcium carbonate dispersing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add CuCl to the reaction kettle 2 6.02g, add 300.20g of toluene after sufficient nitrogen to expel oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 14.03g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a homogeneous complex solution.

[0025] Adjust the temperature to 100° C., and add 320.52 g of tert-butyl acrylate monomer that has been driven by nitrogen to drive oxygen. Within 3 hours, 100 mL of a toluene solution containing 4.06 g of azobisisobutyronitrile was slowly added dropwise, and then reacted with constant temperature and nitrogen flow for 5 hours. After passing through an alumina column to remove transition metals, the resulting solution was mixed with 70.16 g of sodium hydroxide solution (32% by weight), and then heated and hydrolyzed at 120° C. for 3 hours to convert tert-butyl polyacrylate into sodium polyacrylate.

[0026] The solvent and tert-butanol by-product ...

Embodiment 2

[0028] Add CuCl to the reaction kettle 2 10.91g, add 350.30g of toluene after sufficient nitrogen to drive away oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 25.20g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a homogeneous complex solution.

[0029] The temperature was raised to 95°C, and 355.24 g of tert-butyl methacrylate monomer that had been driven by nitrogen to drive oxygen was added. Within 3 hours, 100 mL of a toluene solution containing 7.80 g of azobisisobutyronitrile was slowly added dropwise, and then reacted with constant temperature and nitrogen for 5 hours. After passing through an alumina column to remove transition metals, mix the resulting solution with 70.05 g of sodium hydroxide solution (weight concentration 32%), and then hydrolyze at 130° C. for 4 hours to convert poly-tert-butyl methacrylate into poly-sodium methacrylate .

[0030] The solvent and tert-bu...

Embodiment 3

[0032] Preparation of low molecular weight narrow distribution poly(sodium acrylate-co-sodium methacrylate):

[0033] Add CuCl to the reaction kettle 2 8.03g, add 350.20g of toluene after sufficient nitrogen to drive oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 18.60g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a homogeneous complex solution.

[0034] Adjust the temperature to 90° C., and add 337.52 g of a monomer mixture of tert-butyl methacrylate and tert-butyl acrylate that has been driven through nitrogen to drive oxygen. Within 3 hours, 100 mL of a toluene solution containing 5.37 g of azobisisobutyronitrile was slowly added dropwise, and the mixture was reacted with nitrogen at constant temperature for 5 hours. After passing through the alumina column to remove transition metals, the resulting solution was mixed with 70.05 g of sodium hydroxide solution (32% by weight), an...

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Abstract

The invention discloses a preparation method of a high-efficiency calcium carbonate dispersing agent, which comprises the following steps of: (1) reacting transition metal halides with 2,2'-dipyridyl in solvent under inert atmosphere to obtain complex solution; (2) mixing the complex solution and a vinyl carboxylate monomer, adding initiator solution, reacting, treating by column chromatography on a reaction product to remove transition metal, and collecting solution obtained after treatment by the column chromatography; and (3) mixing the obtained solution and solution of sodium hydroxide, distilling to remove a solvent and an alcohol by-product, regulating the pH value by adding an alkaline substance, and regulating solid content by adding water to obtain the dispersing agent. In the method, ester monomers such as acrylates, methacrylates and the like are subjected to reverse atom transfer radical polymerization to prepare polyacrylate or polymethacrylate with narrow molecular weight distribution, and the polyacrylate or the polymethacrylate is hydrolyzed in the solution of the sodium hydroxide to prepare a sodium polyacrylate or sodium polymethacrylate dispersing agent with high dispersing efficiency.

Description

technical field [0001] The invention relates to a preparation method and application of an ultrafine calcium carbonate high-efficiency dispersant. Background technique [0002] Calcium carbonate is a very important inorganic chemical filler, which is widely used in the production, processing and application of papermaking, paint, rubber, plastic, ink, medicine, food, feed, cosmetics, etc. 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 carbonate. Low molecular weight sodium polyacrylate is one of the most effective dispersants in the production of calcium carbonate...

Claims

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Application Information

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IPC IPC(8): C08F120/18C08F220/18C08F8/12B01F17/52B01F17/36C09C1/02C09C3/04C09C3/10C09K23/36C09K23/52
Inventor 施晓旦金霞朝王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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