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Preparation method of sodium polyacrylate

A technology of sodium polyacrylate and polyacrylic acid is applied in the field of preparation of high molecular polymers, which can solve the problems of different appearance and shape, uneven product molecular weight, unstable temperature and state, etc., and achieves simple process and uniform molecular weight distribution. Effect

Active Publication Date: 2019-04-12
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The usual preparation method of high molecular weight sodium polyacrylate is inverse emulsion polymerization, which is a relatively mature and traditional process, but in the process of preparing sodium polyacrylate by this method, when the molecular weight of sodium polyacrylate reaches a certain order of magnitude, it will break through In the water-in-oil emulsification system, the reaction rate and molecular weight increase rapidly, and the temperature and state of the entire reaction system become extremely unstable. At the same time, the molecular weight of the obtained product is uneven and the appearance is different.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 100g of acrylic acid is added to the water of 900g, and be warmed up to 68 ℃, the massfraction that makes acrylic acid is the acrylic acid aqueous solution of 10%;

[0037] Then, under the conditions of 68° C. and a rotating speed of 100 rpm, 1 g of ammonium persulfate was added to an aqueous solution of acrylic acid to cause self-polymerization of acrylic acid to obtain a solution containing polyacrylic acid; and using a peristaltic pump, at the same temperature and rotating speed Add 170 g of 30% sodium hydroxide aqueous solution dropwise into the solution containing polyacrylic acid within 20 minutes, and continue stirring for 0.5 h to prepare a solution containing sodium polyacrylate.

[0038] The prepared solution containing sodium polyacrylate is tested, and the result shows that the number average molecular weight of sodium polyacrylate is 98011, and the molecular weight distribution is 3.21.

Embodiment 2

[0040] 110g of acrylic acid is added to the water of 800g, and be warmed up to 68 ℃, the massfraction that makes acrylic acid is the acrylic acid aqueous solution of 12%;

[0041] Then, under the conditions of 68°C and 100rpm rotating speed, 1.2g ammonium persulfate was added to the aqueous acrylic acid solution to make the acrylic acid self-polymerize to obtain a solution containing polyacrylic acid; and using a peristaltic pump, at the same temperature and rotating speed 170 g of 30% sodium hydroxide aqueous solution was added dropwise to the solution containing polyacrylic acid within 20 minutes, and continued to stir for 0.5 h to obtain a solution containing sodium polyacrylate.

[0042] The prepared solution containing sodium polyacrylate is tested, and the result shows that the number average molecular weight of sodium polyacrylate is 11240, and the molecular weight distribution is 3.57.

Embodiment 3

[0044] 100g of acrylic acid is added to the water of 900g, and be warmed up to 68 ℃, the massfraction that makes acrylic acid is the acrylic acid aqueous solution of 10%;

[0045] Then, at 68° C. and a rotating speed of 100 rpm, 1 g of potassium persulfate was added to an aqueous solution of acrylic acid to cause self-polymerization of acrylic acid to obtain a solution containing polyacrylic acid; and using a peristaltic pump, 170 g of Aqueous sodium hydroxide solution with a mass fraction of 30% was added dropwise to the solution containing polyacrylic acid within 20 minutes, and the stirring was continued for 0.5 h to obtain a solution containing sodium polyacrylate.

[0046]The prepared solution containing sodium polyacrylate is tested, and the result shows that the number average molecular weight of sodium polyacrylate is 7802, and the molecular weight distribution is 2.94.

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Abstract

The invention relates to a preparation method for sodium polyacrylate, comprising the following steps at reaction temperatures: adding an initiator to a solution containing acrylic acid to self-polymerize acrylic acid to obtain a solution containing polyacrylic acid; and adding, preferably, dropwise adding sodium hydroxide to the solution containing polyacrylic acid to conduct neutralization reaction on the sodium hydroxide and the polyacrylic acid to form sodium polyacrylate. The preparation method is simple and friendly to environment, and the sodium polyacrylate obtained by the preparationmethod has a number average molecular weight of 7000 to 12000, a molecular weight distribution of 4 or less, and a uniform molecular weight distribution.

Description

technical field [0001] The invention relates to the field of preparation of high molecular polymers, in particular to a preparation method of sodium polyacrylate. Background technique [0002] Sodium polyacrylate is a kind of water-soluble polymer electrolyte material, the small molecule is liquid, and the large molecule is solid. Due to its excellent physical and chemical properties, polyacrylic acid and its sodium salt have the functions of thickening, suspension dispersion, flocculation, and washing builder. Sodium polyacrylate is often widely used in medicine, paint, metallurgy, cosmetics and other aspects. Sodium polyacrylate is compounded with other water treatment agents, and can be used for oil field water injection, cooling water, and boiler water treatment. It can be used at high pH and high concentration without scaling. It is used as fluid loss reducer in low solids drilling. Sodium polyacrylate is especially suitable for high polymer materials in industries s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/06C08F8/44
CPCC08F8/44C08F120/06
Inventor 王栋民张川川杨国武王璜琪
Owner CHINA UNIV OF MINING & TECH (BEIJING)