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Preparation method for high-efficiency heavy calcium carbonate grinding dispersing agent with comb-shaped structure, product and application of product

A dispersant and high-efficiency technology, applied in the treatment of dyeing polymer organic compounds, dyeing physical treatment, fibrous fillers, etc., can solve the problems of precipitation and the reduction of dispersant utilization efficiency, and achieve excellent performance, accurate and controllable molecular weight, reduce effect of influence

Active Publication Date: 2017-03-29
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 polydisperse sodium polyacrylate close to the molecular weight has better dispersion than polydisperse sodium polyacrylate, and the former can be irreversibly adsorbed to calcium carbonate particles completely On the surface of calcium carbonate, so as to achieve a good dispersion of calcium carbonate; 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 even precipitation may occur

Method used

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  • Preparation method for high-efficiency heavy calcium carbonate grinding dispersing agent with comb-shaped structure, product and application of product

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preparation example Construction

[0033] The first aspect of the present invention provides a kind of preparation method of the efficient heavy calcium grinding dispersant of comb structure, comprises the steps:

[0034] (1) Add vinyl carboxylic acid monomer, methacrylic acid polyethylene glycol monomer, polythioester chain transfer agent, initiator in the solvent, and use nitrogen gas bubbling for a certain period of time, then seal;

[0035] (2) heating to a certain temperature for a period of time;

[0036] (3) After the reaction finishes, the solvent is distilled off and diluted with water;

[0037] (4) Add one or more alkaline reagent solutions to adjust the pH of the system to 5-8, and add water to adjust the solid content to 20%-50%, so as to obtain a high-efficiency heavy calcium grinding dispersant.

[0038] In a preferred embodiment, the mass parts of each reactant are as follows:

[0039] Vinyl carboxylic acid monomer 30-100 parts

[0040] Polyethylene glycol methacrylate monomer 2-30 parts

[0...

Embodiment 1

[0055] The preparation of the poly(acrylic acid-co-ethylene glycol methacrylate) salt of low molecular weight narrow distribution of embodiment 1

[0056] In the reaction vessel, add 8.98 g of dithioester chain transfer agent 4-cyano-4-dithiobenzoyloxyvaleric acid, 1.90 g of initiator azobisisobutyronitrile, and 320.0 g of solvent dioxane And monomer acrylic acid 172g, methacrylate ethylene glycol ester 118g. The system was sealed after bubbling with nitrogen for 20 minutes, and then heated to 70° C. for 12 hours to react. After the reaction is over, the resulting solution is distilled off under reduced pressure to remove the solvent, then diluted with a small amount of water, then add the mixed suspension of alkali reagent with a molar ratio of [calcium hydroxide]:[magnesium hydroxide]=2:1 to adjust the pH to 6.89, and add water Adjust the solid content of the polymer solution to 25% to obtain the final dispersant sample. The obtained dispersant has a weight average molecular...

Embodiment 2

[0057] The preparation of the polymethacrylate of embodiment 2 low molecular weight narrow distribution

[0058] Add 9.12g of dithioester chain transfer agent cyanoisopropyl dithiobenzoate, 2.22g of initiator azobisisobutyronitrile, 240.21g of solvent tetrahydrofuran and 122.00g of monomer methacrylic acid into the quartz reaction vessel, Ethylene glycol methacrylate 35.63g. The system was sealed after bubbling with nitrogen for 20 minutes, and then heated to 80° C. for 8 hours to react. After the reaction is over, the resulting solution is distilled off under reduced pressure to remove the solvent, then diluted with a small amount of water, then add the mixed suspension of alkali reagent with a molar ratio of [calcium hydroxide]:[magnesium hydroxide]=1:1 to adjust the pH to 7.11, and add water Adjust the solid content of the polymer solution to 25% to obtain the final dispersant sample. The weight-average molecular weight of the obtained dispersant was 7830, and the molecul...

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Abstract

The invention discloses a preparation method for a high-efficiency heavy calcium carbonate grinding dispersing agent with a comb-shaped structure, wherein the preparation method comprises the following steps: (1) adding a vinyl carboxylic acid monomer, a methacrylic acid polyethylene glycol monomer, a polythio ester chain transfer agent and an initiator into a solvent, then bubbling with nitrogen gas for a period of time, and then sealing; (2) heating to a certain temperature, and carrying out a reaction for a period of time; (3) after the reaction is finished, distilling to remove the solvent, and adding water to dilute; and (4) adding one or more alkali reagent solutions, adjusting the pH of the system to 5-8, adding water to adjust the solid content to 20 mass%-50 mass%, and thus obtaining the high-efficiency heavy calcium carbonate grinding dispersing agent. The invention also discloses the comb-shaped structure dispersing agent prepared by the method; a side chain can effectively enhance the steric effect, the molecular weight and the molecular weight distribution can be precisely controlled, free counter ions are not introduced, and the operation is simple and feasible; and at the same time, alkalis calcium hydroxide and magnesium hydroxide are introduced in a neutralization stage in the method, the counter ion effect of the dispersing agent can be reduced, and thus the dispersion performance is improved.

Description

technical field [0001] The invention relates to a preparation method of a grinding dispersant, in particular to a preparation method of a high-efficiency heavy calcium grinding dispersant with a comb structure, a product prepared according to the method and an application of the product. Background technique [0002] Dispersants have been widely used in the wet grinding production of ultra-fine heavy calcium, which can significantly reduce the grinding viscosity of heavy calcium slurry, reduce anti-sticking after grinding, and increase the stability of slurry, which is very important for reducing wear and improving product quality. has an important role. [0003] Current research shows that the dispersion mechanism of heavy calcium grinding dispersant is as follows: 1 polymer polycarboxylate molecules are adsorbed on the surface of calcium carbonate particles to form an electric double layer, which has electrostatic repulsion; 2 polymers are adsorbed on the surface of partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/06C08F2/38C09C1/02C09C3/04C09C3/10
Inventor 施晓旦邵威金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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