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Preparation method of colorless transparent sodium polyacrylate dispersing agent

A technology of sodium polyacrylate and dispersant is applied in the field of preparation of sodium polyacrylate to achieve the effects of increasing shelf life, preventing mildew and reducing production costs

Active Publication Date: 2020-07-28
SNF CHINA FLOCCULANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prior to this, there were few relevant literature and patent reports aimed at the synthesis of colorless transparent sodium polyacrylate dispersant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step (1): Add a 3.4% sodium hypophosphite aqueous solution into the reactor as an initial solution, the liquid level of the initial solution is higher than the stirring blades of the reactor, and the temperature of the reactor is adjusted to 80°C;

[0031] Step (2): Add the acrylic acid aqueous solution, the ammonium persulfate aqueous solution and the sodium hypophosphite aqueous solution into the reactor at a constant speed and in parallel, wherein the mass ratio of the acrylic acid and ammonium persulfate is 40; the acrylic acid and sodium hypophosphite The mass ratio is 20; the stirring speed is kept at 300rpm during the dropping process, and the temperature of the reactor is maintained at 85°C until the dropping process ends;

[0032] Step (3): Adjust and maintain the temperature of the reactor at 70°C, add benzoyl peroxide to the reactor, wherein the mass ratio of acrylic acid to benzoyl peroxide is 300, when benzoyl peroxide After the acyl is fully stirred evenly...

Embodiment 2

[0034] Step (1): Add 3.4% sodium hypophosphite aqueous solution into the reaction kettle as the initial solution, the liquid level of the initial solution is higher than the stirring blade of the reaction kettle, and the temperature of the reaction kettle is adjusted to 60°C;

[0035] Step (2): Acrylic acid aqueous solution, benzoyl peroxide aqueous solution and sodium hypophosphite aqueous solution are respectively added in the reaction kettle at a constant speed in parallel, wherein the mass ratio of the acrylic acid and benzoyl peroxide is 40; acrylic acid and The mass ratio of sodium hypophosphite is 20; the stirring speed is kept at 300rpm during the dropping process; light is used for the first stage of irradiation in the reactor, and a 50W high-pressure mercury lamp is used for irradiation, the main wavelength is 365nm, and the irradiation area of ​​the light is the inside of the reactor 3 / 4 of the cross-sectional area, the distance between the reactor and the light emit...

Embodiment 3

[0038] Step (1): Add a 3.4% aqueous solution into the reactor as an initial solution, the liquid level of the initial solution is higher than the stirring paddle of the reactor, and adjust the temperature of the reactor to 80°C;

[0039] Step (2): Add acrylic acid aqueous solution, ammonium persulfate aqueous solution and sodium hypophosphite aqueous solution to the reaction kettle at a constant speed and flow, wherein the mass ratio of acrylic acid and ammonium persulfate is 40; acrylic acid and sodium hypophosphite The mass ratio is 20; the stirring speed is kept at 300rpm during the dropping process, and the temperature of the reactor is maintained at 85°C until the dropping process ends;

[0040] Step (3): The reactor is irradiated with light in the second stage, using a 75W fluorescent lamp to irradiate, the main wavelength range is 450nm, and the irradiated area of ​​the light is 3 / 4 of the internal cross-sectional area of ​​the reactor. The distance from the source of l...

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Abstract

The invention discloses a preparation method of a colorless transparent sodium polyacrylate dispersing agent, which comprises the following steps: initiating polymerization under the assistance of light in the initial stage of polymerization to synthesize low-molecular-weight polyacrylic acid, continuously irradiating ultraviolet light or visible light in the process of neutralizing the polyacrylic acid with sodium hydroxide, and finally, adding a certain amount of benzoyl peroxide into the synthesized polymer to achieve corresponding decolorization and corrosion prevention effects. The sodiumpolyacrylate dispersing agent prepared by the invention is in a colorless and transparent state, the chromaticity of the sodium polyacrylate dispersing agent is excellent by adopting a spectrophotometer, and the sodium polyacrylate dispersing agent achieves a good effect in the application field. The dispersing agent is simple in preparation method and low in cost, and has the characteristics ofstable product performance and good dispersing performances.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a preparation method of colorless and transparent sodium polyacrylate. [0002] technical background [0003] Sodium polyacrylate dispersant is often used in papermaking, coatings, textiles, water treatment, agriculture, daily chemicals, civil engineering, ceramics, etc. In the process of use, most of the sodium polyacrylate dispersant aqueous solutions can be used directly. In most applications, due to the chromaticity requirements of downstream products, it is necessary to use colorless and transparent sodium polyacrylate dispersants. Often cheap acrylic acid raw materials on the market, including acrylic acid waste liquid, the polymerized products are often yellow or pink, which cannot meet the needs of downstream application industries and limit its application range in many fields. How to synthesize high-quality colorless and transparent products with cheap raw materials has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/06C08F2/38C08F2/48C08F4/40C08F4/34C08F4/30C08F8/42C08F6/06
CPCC08F2/38C08F2/48C08F4/30C08F4/34C08F4/40C08F6/06C08F8/42C08F120/06C08L33/02
Inventor 陶倩云凌静丁健
Owner SNF CHINA FLOCCULANT
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