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High-efficiency salt-tolerance dispersing agent and preparation method and application thereof

A technology of dispersant and salt resistance, which is applied in the field of ultrafine calcium carbonate dispersant and its preparation, and can solve problems such as poor application effect

Active Publication Date: 2012-11-28
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Sodium polyacrylate is a kind of anionic polymer dispersant, which is very sensitive to free cations in the slurry. When the system contains more free cations (inorganic salts, etc.), sodium polyacrylate will grind and disperse calcium carbonate. The effect of the application will be greatly reduced

Method used

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  • High-efficiency salt-tolerance dispersing agent and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of poly(acrylic acid-b-vinyl alcohol) sodium salt with low molecular weight narrow distribution:

[0030] 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.

[0031] A mixture of 288 g of tert-butyl acrylate monomer and 4.9 g of ethyl bromide initiator after nitrogen flooding was added, the temperature was raised to 80° C., and nitrogen was passed at constant temperature for 5 hours. 32 g of vinyl acetate was added, and the reaction was continued for 5 hours. After the transition metal halides were removed by passing through the alumina column, the resulting solution was mixed with 62.5 g of sodium hydroxide solution (32% by weight) and then hydrolyzed at 120° C. for 3 hours to make poly(te...

Embodiment 2

[0034] Preparation of poly(methacrylic acid-b-vinyl alcohol) sodium salt with low molecular weight narrow distribution:

[0035] Add RhCl to the reactor 2 8.9g, add 350g of benzene after sufficient nitrogen to drive oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 28g 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 32 g of vinyl acetate and 9.8 g of ethyl bromide, which has been driven by nitrogen to drive oxygen, was added, the temperature was raised to 80° C., and the reaction was carried out by nitrogen at a constant temperature for 5 hours. 320 g of tert-butyl methacrylate monomer was added, and the reaction was continued for 4 hours. After passing through the alumina column to remove the transition metal halide, the resulting solution was mixed with 62.5 g of sodium hydroxide solution (32% by weight), and then hydrolyzed at 140° C. for 4 hou...

Embodiment 3

[0037] Preparation of low molecular weight narrow distribution poly(acrylic acid-co-methacrylic acid-b-vinyl alcohol) sodium salt:

[0038] FeCl was added to the reactor 2 6.68g, add 350g of ethyl acetate after sufficient nitrogen to drive oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 21g of 2,2'-bipyridine, heat up to 50°C under nitrogen protection, and react for 1 hour to obtain a homogeneous complex solution. Add a mixture of 160 g of tert-butyl methacrylate, 144 g of tert-butyl acrylate and 7.35 g of ethyl bromide that have been driven to drive oxygen by nitrogen, raise the temperature to 80° C., and react with nitrogen at a constant temperature for 4 hours. 32 g of vinyl acetate was added, and the reaction was continued for 5 hours. After passing through an alumina column to remove transition metal halides, the resulting solution was mixed with 62.5 g of sodium hydroxide solution (32% by weight), and then hydrolyzed at 140° C. for 4.5 hours t...

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Abstract

The invention provides a high-efficiency salt-tolerance dispersing agent and a preparation method and application thereof. The preparation method comprises the following steps of: (1) reacting a low-valence transition metal halide with 2,2'-bipyridine in the solvent in the inert gas atmosphere, then adding an ethylene group carboxylic ester monomer and initiator halogenated hydrocarbon to react and adding a vinylacetate monomer to react; (2) carrying out column chromatography to remove the transition metal halide and mixing the obtained solution with a sodium hydroxide solution and hydrolyzing; and (3) removing the solvent, acetic acid and alcohol side products by distillation, adding an NaOH solution, adjusting the pH value, adding water and adjusting the weight and the solid content to obtain the dispersing agent. The dispersing agent has high dispersing efficiency and salt tolerance and can be used for dispersing heavy calcium carbonate powder during grinding.

Description

technical field [0001] The invention relates to an ultrafine calcium carbonate dispersant with outstanding salt resistance performance and excellent dispersing effect 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. 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. For the production of high-grade calcium carbonate, the role of dispersa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F220/18C08F218/08C08F8/44C08F8/12B01F17/52C09C1/02C09C3/04C09C3/10C09K23/52
Inventor 施晓旦金霞朝王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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