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Salt resistant calcium carbonate dispersing agent and preparation method thereof

A calcium carbonate and dispersant technology, applied in chemical instruments and methods, dyeing polymer organic compound treatment, fibrous fillers, etc., can solve the problems of poor application effect

Active Publication Date: 2010-10-13
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of poly(acrylic acid-co-vinyl alcohol) sodium salt with low molecular weight narrow distribution:

[0032] 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. A mixture of 288 g of tert-butyl acrylate monomer, 32 g of vinyl acetate and 4.9 g of ethyl bromide initiator, 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. 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 120° C. for 3 hours to make poly(tert-butyl acrylate-co-v...

Embodiment 2

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

[0035] Add RhCl to the reactor 2 10g, add 350g of benzene after sufficient nitrogen to drive oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 31.5g 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 320 g of tert-butyl methacrylate monomer, 32 g of vinyl acetate and 11 g of ethyl bromide initiator that has been driven by nitrogen to drive oxygen was added, the temperature was raised to 80° C., and the mixture was reacted by nitrogen at a constant temperature 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 hours to make poly(tert-butyl methacrylate-co -vinyl acet...

Embodiment 3

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

[0038] FeCl was added to the reactor 2 4.05g, add 350g of ethyl acetate after sufficient nitrogen to drive away oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 12.72g 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. Add a mixture of 160 g of tert-butyl methacrylate, 144 g of tert-butyl acrylate, 32 g of vinyl acetate and 4.45 g of ethyl bromide, which have been driven by nitrogen to drive oxygen, and raise the temperature to 80° C., and react with nitrogen at a constant temperature 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 120° C. for 4.5 hours to make poly(tert-butyl ac...

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Abstract

The invention provides a salt resistant calcium carbonate dispersing agent and preparation method thereof. The preparation method includes the following steps: (1) low valence transitional metal halide is added into a kettle, under the anaerobic condition, solvent and 2, 2'-bipyridine are added, and reaction is carried out, so as to obtain complex solution; (2) vinyl carboxylic ester monomer, vinyl acetate and initiator halogenated hydrocarbon are added, and reaction is carried out; (3) column chromatography is carried out to remove the transitional metal halide, and the obtained solution is added into NaOH solution to be hydrolyzed; (4) distillation is carried out to remove solvent, acetic acid and alcohol side product, then NaOH solution is added to regulate pH, and water is added to regulate weight solid content, so as to obtain the dispersing agent. The invention produces a poly (vinyl carboxylic acid-co-vinyl alcohol) sodium salt dispersing agent which has high dispersing efficiency and strong salt resistance and is used for calcium carbonate.

Description

technical field [0001] The invention relates to a dispersant for calcium carbonate 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 dispersants is particularly important. [0003] Sodium polyacrylate with a molecular weight...

Claims

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Application Information

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