Dispersing agent for grinding triple superphosphate with branched structure and preparation method thereof

A branched structure, dispersant technology, applied in chemical instruments and methods, chemical/physical processes, transportation and packaging, etc., can solve the problems of reduced dispersant utilization efficiency and precipitation, and achieve excellent dispersion performance and simple operation. Ease of operation and low energy consumption

Active Publication Date: 2014-09-03
DSSUN NEW MATERIAL SHANDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research results of J.Loiseau[Macromolecules2003,36,3066-3077] show that sodium polyacrylate close to molecular weight monodisperse has better dispersing effect than polydisperse sodium polyacrylate, and the former can be irreversibly fully adsorbed to calcium carbonate particles. On the surface, so as to achieve a good dispersion of 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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  • Dispersing agent for grinding triple superphosphate with branched structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of branched structure sodium polyacrylate:

[0025] In the quartz reaction vessel, add 10.81 g of p-vinylbenzyl dithiobenzoate containing double bond chain transfer agent, 5.60 g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, Solvent tetrahydrofuran 474.0g and monomer acrylic acid 144.05g. The system was bubbled with nitrogen for 20 minutes and then sealed. During the bubbling process, avoid light. The reactor should be wrapped with aluminum foil, and then placed under an ultraviolet lamp with a central wavelength of 365nm. The ultraviolet light is irradiated by a cut-off plate with a cut-off wavelength greater than 254nm, while maintaining the incident intensity of ultraviolet light at 10mw / cm 2 , Remove the aluminum foil at room temperature and start to react for 8 hours. Add a small amount of water to dilute after distilling off solvent after finishing, and gained solution is 4.36 with 65.23g sodium hydroxide solution (32%) regulation...

Embodiment 2

[0027] The preparation of the polysodium methacrylate of branched structure:

[0028] Add 10.72g of S-p-vinylphenyl S'-propyl trithiocarbonate containing double bond chain transfer agent, 2.91g of photoinitiator benzophenone, 453.01g of solvent tetrahydrofuran and monomer A into the quartz reaction vessel. Acrylic acid 168.00g. The system was bubbled with nitrogen for 20 minutes and then sealed. During the bubbling process, avoid light. The reactor should be wrapped with aluminum foil, and then placed under an ultraviolet lamp with a central wavelength of 365nm. The ultraviolet light is irradiated by a cut-off plate with a cut-off wavelength greater than 254nm, while maintaining the incident intensity of ultraviolet light at 12mw / cm 2 , Remove the aluminum foil at room temperature and start to react for 6 hours. After the end, the gained solution was distilled to remove the solvent, added a small amount of water to dilute, then added 73.08g sodium hydroxide solution (32%) in...

Embodiment 3

[0030] Preparation of branched structure poly(sodium acrylate-co-sodium methacrylate):

[0031] Add 10.89 g of double bond-containing chain transfer agent S-p-vinylphenyl S'-propyl trithiocarbonate, photoinitiator 2,4,6-trimethylbenzoyl-diphenyl Phosphine oxide 7.01g, solvent tetrahydrofuran 454.79g and monomer methacrylic acid 83.85g and acrylic acid 72.13g. The system was bubbled with nitrogen for 20 minutes and then sealed. During the bubbling process, avoid light. The reactor should be wrapped with aluminum foil, and then placed under an ultraviolet lamp with a central wavelength of 365nm. The ultraviolet light is irradiated by a cut-off plate with a cut-off wavelength greater than 254nm, while maintaining the incident intensity of ultraviolet light at 12mw / cm 2 , Remove the aluminum foil at room temperature and start to react for 8 hours. After the solvent is distilled off after the end, add a small amount of water to dilute, then add 64.94g sodium hydroxide solution (3...

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Abstract

The invention discloses a method for preparing a dispersing agent for grinding triple superphosphate with a branched structure. The method comprises the following steps: adding vinyl carboxylic acid monomer, a polythioester chain transfer agent containing double bonds and a photoinitiator into a solvent, and bubbling for 15-30 minutes with nitrogen; irradiating to react for 3-12 hours with incident light passing through a wave clipping plate with clipping range more than 254nm by utilizing an ultraviolet lamp with central wavelength of 365nm; distilling to remove the solvent, and adding a NaOH solution to regulate the pH of the system to be 4-8, and adding water to regulate weight solid content to 41-43 percent to obtain the dispersing agent for grinding triple superphosphate with a branched structure. The dispersing agent has an excellent dispersing performance on calcium carbonate due to the branched structure; the molecular weight distribution for preparing the dispersing agent is narrow, the initiating process does not introduce free counterions. Post-treatment is simple, the product is pure, and energy consumption is low.

Description

technical field [0001] The invention relates to a dispersant for grinding heavy calcium with a branched structure and a preparation method thereof. Background technique [0002] Dispersants play a very important role in the wet grinding production of ultra-fine heavy calcium, which can significantly reduce the grinding viscosity of heavy calcium materials, reduce anti-sticking after grinding, and increase the stability of slurry, which is very important for reducing wear and improving product quality. have an important role. [0003] At present, most of the dispersants for heavy calcium grinding are polycarboxylate aqueous solutions, and the main synthesis method is traditional solution free radical polymerization. However, the molecular weight distribution of polymers synthesized by traditional solution free radical polymerization is very wide, and the molecular weight control is poor. According to research, the molecular weight and distribution of dispersant have a great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/06C08F220/06C08F2/48C08F2/38C08F2/06B01F17/52C09K23/52
Inventor 施晓旦邵威金霞朝
Owner DSSUN NEW MATERIAL SHANDONG
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