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Preparation method of food grade polyacrylamide

A technology of polyacrylamide and acrylamide, which is applied in the field of functional polymers, can solve problems such as incomplete polymerization, high residual monomer content, and failure to meet the use requirements, so as to reduce energy consumption, green production process, and reduce raw material costs Effect

Inactive Publication Date: 2013-08-14
ANHUI TIANRUN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Food-grade polyacrylamide is a linear water-soluble polymer. At present, polyacrylamide is widely used in drinking water, food, medicine and other industries. The national standard for acrylamide residual monomer content is less than 0.025%, but Most of the polyacrylamide currently on the market is hydrolyzed by acrylamide polymerization and adding a hydrolyzing agent. Since this polymerization method is a one-stage polymerization initiation, the polymerization is incomplete, resulting in a higher residual monomer content than the national standard, which cannot meet the requirements of food grade.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a 500ml jar, under stirring with a glass rod, slowly add 29g of acrylic acid to 213g of 30% acrylamide aqueous solution, and slowly neutralize to PH=7 with sodium hydroxide under stirring. Add 0.8 g of cosolvent thiourea, and 0.007 g of complexing agent tetrasodium ethylenediamine tetraacetic acid; add 0.015 g of high-efficiency chain transfer agent isopropanol, and 0.2 g of azo compound azobisisobutylamidine hydrochloride. After stirring well and mixing evenly, cool down to 3°C, and start to pass in a flow rate of 60m 3 / h of high-purity nitrogen (nitrogen purity ≥ 99.99%) to remove oxygen in the system. During nitrogen flow, 0.004 g of oxidation initiator potassium persulfate and 0.0015 g of reduction initiator sodium sulfite were sequentially added. When the oxygen content of the system is less than 0.001%, seal and seal. When the reaction no longer heats up, put it into a water bath at 75° C. and heat it for 3 hours. After the heat preservation is over, take o...

Embodiment 2

[0021] In a 500ml jar, under stirring with a glass rod, slowly add 21g of acrylic acid to 213g of 30% acrylamide aqueous solution, and slowly neutralize to PH=6 with sodium bicarbonate while stirring. Add co-solvent polyethylene glycol 2001.8g, and complexing agent ethylenediaminetetraacetic acid disodium salt 0.012g; g. After stirring well and mixing evenly, cool down to 4°C, and start to pass in a flow rate of 60m 3 / h of high-purity nitrogen (nitrogen purity ≥ 99.99%) to remove oxygen in the system. During nitrogen flow, 0.006 g of an oxidation initiator dialkyl peroxide and 0.0008 g of a reduction initiator triethanolamine were sequentially added. When the oxygen content of the system is less than 0.001%, seal and seal. When the temperature of the reaction no longer rises, put it into a water bath at 80° C. and heat it for 1 hour. After the heat preservation is over, take out the colloid, add 0.32g of polyoxyethylene sorbitan monolaurate as an anti-toxic agent, dry in ...

Embodiment 3

[0024] In a 500ml jar, under stirring with a glass rod, slowly add 13g of acrylic acid to 213g of 30% acrylamide aqueous solution, and slowly neutralize to PH=8 with sodium carbonate under stirring. Add 1.8 g of cosolvent urea, and 0.012 g of complexing agent nitrilotriacetic acid sodium salt; add 0.019 g of high-efficiency chain transfer agent dodecanethiol, and 0.07 g of azo compound dimethyl azobisisobutyrate. After stirring well and mixing evenly, cool down to 5°C, and start to pass in a flow rate of 60m 3 / h of high-purity nitrogen (nitrogen purity ≥ 99.99%) to remove oxygen in the system. During nitrogen flow, 0.006 g of oxidation initiator ammonium persulfate and 0.0008 g of reduction initiator sodium bisulfite were sequentially added. When the oxygen content of the system is less than 0.001%, seal and seal. When the temperature of the reaction no longer rises, put it into a water bath at 85° C. and heat it for 2 hours. After the heat preservation is over, take out t...

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Abstract

The invention discloses a preparation method of food grade polyacrylamide, belongs to the field of functional polymers, and in particular relates to polyacrylamide polymers used in drinking water, food and medical industries, wherein the content of residual monomer of acrylamide is less than 0.025%. Food grade polyacrylamide is prepared by copolymerization through a low temperature segmented composite initiator in the presence of a cosolvent from two monomers of acrylamide and acrylic acid. The composite initiator system has the characteristic of prolonging the reaction time, so that the acrylamide monomer is adequately reacted. A counterpoison is further added in the prilling stage, so that the content of residual monomer of acrylamide is further reduced. Food grade polyacrylamide prepared by the invention has the advantages of stable quality of polymerization products, high molecular weight of products (over 18000 thousand) and good water solubility, and the content of residual monomer of acrylamide is less than 0.025% (meeting national standard).

Description

technical field [0001] The invention belongs to the field of functional polymers, in particular to a preparation method of a food-grade polyacrylamide product with low residual monomer content. Background technique [0002] Food-grade polyacrylamide is a linear water-soluble polymer. At present, polyacrylamide is widely used in drinking water, food, medicine and other industries. The national standard for acrylamide residual monomer content is less than 0.025%, but Most of the polyacrylamide currently on the market is hydrolyzed by adding a hydrolyzing agent to the polymerization of acrylamide. Since the polymerization method is a one-stage polymerization initiation, the polymerization is incomplete, resulting in a higher residual monomer content than the national standard, which cannot meet the requirements of food grade use. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of food-grade polyacrylamide, the molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F4/40C08F4/04
Inventor 刘彭城陈建波陶阿晖李大强潘娣王全飞张冉
Owner ANHUI TIANRUN CHEM CO LTD
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