Novel method for preparing polyacrylate aqueous solution

A polyacrylate and aqueous solution technology is applied in the field of preparation of high-purity low-molecular-weight polyacrylic acid aqueous solution, which can solve the problems of harsh reaction conditions, large amount of raw materials, complicated process, etc., and achieves fast reaction rate, convenient operation and high conversion rate Effect

Inactive Publication Date: 2018-11-27
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome practical problems such as complex process, harsh reaction conditions, and large amount of raw materials, the present invention provides a single-initiation method using high-temperature alkali-catalyzed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Each reaction raw material is prepared according to the following mass parts composition:

[0033] Acrylic 215 parts

[0034] Sodium hydroxide 345 parts

[0035] 308 parts of hydrogen peroxide aqueous solution

[0036] 132 parts of high-purity water.

[0037] Add acrylic acid to the reaction kettle, start stirring, neutralize acrylic acid with 30% sodium hydroxide aqueous solution, add high-purity water and stir to mix evenly. Heat up the temperature of the system to 105°C, start to drop a hydrogen peroxide solution with a mass fraction of 27.5% to trigger the free radical polymerization of the acrylic acid monomer, add dropwise for 1 hour, and keep it at 90°C for 1 hour under the pressure of 0.08MPa. A colorless and transparent polyacrylic acid sodium salt solution was obtained.

[0038] The conversion rate was 99.9%. The detected content of free monomer (calculated as AA) is 0.03%, the content of undecomposed hydrogen peroxide is 0.51%, and its viscosity-average ...

Embodiment 2

[0040] Prepare each reaction raw material according to the following mass parts composition

[0041] Acrylic 235 parts

[0042] Ammonia aqueous solution 320 parts

[0043] Hydrogen peroxide aqueous solution 270 parts

[0044] 175 parts of high-purity water.

[0045] Add acrylic acid to the reaction kettle, start stirring, neutralize acrylic acid with 20% ammonia gas aqueous solution, add high-purity water and stir to mix evenly. Heat up the temperature of the system to 95°C, start dropping 27.5% hydrogen peroxide aqueous solution to initiate free radical polymerization of acrylic acid monomers, add dropwise for 1 hour, under 0.09MPa pressure, keep warm at 90°C for 1 hour to obtain colorless Clear aqueous ammonium polyacrylate solution.

[0046] The conversion rate was 99.9%. The detected content of free monomer (calculated as AA) is 0.075%, the content of undecomposed hydrogen peroxide is 0.08%, and its viscosity-average molecular weight is about 5000.

Embodiment 3

[0048] Prepare each reaction raw material according to the following mass parts composition

[0049] Acrylic 193 parts

[0050] 296 parts of aqueous solution of 2-hydroxyethylamine

[0051] Hydrogen peroxide 274 parts

[0052] 237 parts of high-purity water.

[0053] Add acrylic acid to the reaction kettle, start stirring, neutralize acrylic acid with 30% 2-hydroxyethylamine aqueous solution, add high-purity water and stir to mix evenly. Heat up the temperature of the system to 100°C, start to drop a 25% hydrogen peroxide aqueous solution to trigger the free radical polymerization of the acrylic acid monomer, add dropwise for 1 hour, under the pressure of 0.09MPa, keep the reaction at 100°C for 1 hour A colorless and transparent polyacrylic acid sodium salt aqueous solution was obtained.

[0054] The conversion rate was 99.2%. The detected content of free monomer (calculated as AA) was 0.76%, the content of undecomposed hydrogen peroxide was 1.31%, and its viscosity-avera...

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PUM

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Abstract

The invention discloses a novel method for preparing a polyacrylate aqueous solution. The method comprises the following steps: respectively adding the following components in parts by mass into a reaction kettle: 100-500 parts of acrylate monomer, 100-300 parts of high-purity water and 200-400 parts of a base catalyst, and uniformly stirring and mixing; dropwise adding 100-300 mass parts of hydrogen peroxide having the concentration of 20-50 percent into the reaction kettle at a refluxing temperature, holding the temperature, initiating a carbon-carbon double bond to generate a free radical chain polymerization reaction by a hydroxyl radical (HO) or peroxy radical (H-O-O) mono initiation system generated during the decomposition of hydrogen peroxide under the catalysis of any of sodium hydroxide, potassium hydroxide, ammonia water and organic amine. The method has the advantages of stable process, convenience in operation, high reacting speed, high conversion rate, safe process flow and environmental friendliness; a polyacrylate aqueous solution prepared by utilizing the method does not contains substances toxic or hazard to the using environment such as sulfur, phosphorus and thelike, can meet the application requirement in the fields of drinking water treatment, electronic washing and the like, and is easy for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of organic polymer preparation, in particular to a method for preparing an aqueous solution of high-purity and low-molecular-weight polyacrylic acid using acrylic acid and its derivatives as monomers. Background technique [0002] Water-soluble polymers, especially low-molecular-weight polycarboxylic acids and their salts, are more and more widely used because of their good anti-scaling and slow-release properties, high thermal stability, excellent dispersibility, and convenient use. Used as water treatment additives in various fields. With the development of the industry and the continuous expansion of products in high-end application fields, the requirements for the purity of products are becoming more and more refined, so the requirements for the synthesis process of products are becoming more and more stringent. Green and safe product preparation methods will surely become a research hotspot. [0003] T...

Claims

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Application Information

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IPC IPC(8): C08F120/06C08F2/10
CPCC08F2/10C08F120/06
Inventor 陆久田李鹏飞程终发申义驰王东海齐晓婧
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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