Beaded sodium polyacrylate and preparation method thereof

A technology of sodium polyacrylate and sodium acrylate, which is applied in the field of polymer manufacturing, and can solve problems such as difficulty in stirring and heat dissipation, complicated control process, and difficulty in preparing high-molecular-weight sodium polyacrylate.

Active Publication Date: 2013-08-14
BEIJING HENGJU CHEM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polymerization of sodium acrylate aqueous solution has the advantages of convenient implementation, simple equipment, low gel content of the product, and stable system, it has the disadvantages of high viscosity in the later stage of polymerization, difficulty in stirring and heat dissipation, and it is difficult to prepare high molecular weight sodium polyacrylate.
Nalco of the United States and Catalyst Chemical Company of Japan have adopted the belt polymerization process to solve the problems of heat transfer and stirring, but the equipment cost is high and the control process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of beaded sodium polyacrylate, comprising the steps of:

[0031] (1) Configuration of sodium acrylate monomer solution: Add 330g of acrylic acid and 450g of water into the batching tank, control the temperature at 36°C, and slowly add 310g of 50% sodium hydroxide solution dropwise; (2) Add sodium acrylate into the water phase tank respectively 300 parts of monomer solution; 0.5 g of EDTA; 3 g of benzoyl peroxide; 6 g of dimethyl azobisisobutyrate; stir to dissolve and disperse evenly to obtain a single-phase body.

[0032] (3) Add 5g of a stabilizer with a mass ratio of polyvinyl acetate and polymethacrylic acid of 1:1 to the reaction kettle, then add 600g of a mixed solvent of diesel oil and kerosene with a mass ratio of 1:1, and then keep warm at 30°C. Stir with a stirrer, the stirring speed is 100r / min, and nitrogen is filled under the liquid surface at the same time.

[0033] (4) After filling the reactor with nitrogen for 30 minutes, add the m...

Embodiment 2

[0036] A preparation method of beaded sodium polyacrylate, comprising the steps of:

[0037] (1) Configuration of sodium acrylate monomer solution: Add 360g of acrylic acid and 500g of water into the batching tank, control the temperature at 40°C, and slowly add 350g of 50% sodium hydroxide solution dropwise;

[0038] (2) Add 300g of sodium acrylate monomer solution; 0.4g of EDTA; 3g of benzoyl peroxide; 8g of azobisisoheptanonitrile into the water phase tank; stir to dissolve and disperse evenly to obtain a single-phase body.

[0039] (3) Add 6g of a stabilizer with a mass ratio of polyvinyl acetate and hydroxypropyl cellulose of 1:1 to the reactor, then add 600g of a mixed solvent of diesel and kerosene with a mass ratio of 1:1, and then keep warm at 30°C. Stir with a stirrer while filling with nitrogen below the liquid surface.

[0040] (4) After filling the reactor with nitrogen for 30 minutes, add the monomer phase at a temperature below 30°C and stir for 15 minutes, adj...

Embodiment 3

[0043] A preparation method of beaded sodium polyacrylate, comprising the steps of:

[0044] (1) Configuration of sodium acrylate monomer solution: Add 350g of acrylic acid and 500g of water into the batching tank, control the temperature at 35°C, and slowly add 320g of 50% sodium hydroxide solution dropwise;

[0045] (2) Add 300g of sodium acrylate monomer solution; 0.5g of EGTA; 4g of benzoyl peroxide; 6g of dimethyl azobisisobutyrate into the water phase tank; stir to dissolve and disperse evenly.

[0046] (3) Add 4g of a stabilizer with a mass ratio of polyvinyl acetate and polyvinylpyrrolidone of 1:1 to the reactor, then add 600g of a mixed solvent of diesel and kerosene with a mass ratio of 1:1, and then keep warm at 30°C, and use The stirrer is stirred, and the stirring speed is 100 rpm, and at the same time, nitrogen gas is filled under the liquid surface to protect the polymerization system.

[0047] (4) After filling the reactor with nitrogen for 20 minutes, add the...

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PUM

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Abstract

The invention provides beaded sodium polyacrylate (PAANa) and a preparation method thereof. The preparation method is characterized in that an efficient stable system is adopted and an inverse suspension polymerization process is adopted, so that a quick-dissolving PAANa product with high intrinsic viscosity (not less than 10dL/g) and excellent dissolubility (not more than 0.5h) can be prepared. Meanwhile, by adjusting the process, beaded superhigh molecular weight quick-dissolving PAANa products with different intrinsic viscosities can be prepared. The obtained PAANa product can replace aqueous solution type and powdery PAANa products with low intrinsic viscosity, and is expected to be widely applied to water treatment, papermaking, oil exploration, textile printing and dyeing, daily chemical industry and other aspects.

Description

technical field [0001] The invention belongs to the field of polymer production, and in particular relates to a beaded sodium polyacrylate and a preparation method thereof. Background technique [0002] Polyacrylic acid and its sodium salt are widely used in coatings, metallurgy, medicine, cosmetics, etc. because of their excellent physical and chemical properties, such as thickening, suspension dispersion, flocculation, and washing aid. It has unique applications in food additives, flocculation of aluminum red mud, and treatment of animal and vegetable protein wastewater. Although the polymerization of sodium acrylate aqueous solution has the advantages of convenient implementation, simple equipment, low gel content of the product, and stable system, it has the disadvantages of high viscosity in the later stage of polymerization, difficulty in stirring and heat dissipation, and it is difficult to prepare high molecular weight sodium polyacrylate. Nalco of the United States...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/06C08F2/32
Inventor 徐青林郭文礼杨开吉
Owner BEIJING HENGJU CHEM GRP
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