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Preparation method of food-grade polyacrylamide

A polyacrylamide and acrylamide technology, applied in the field of functional polymers, can solve the problems of backward production technology and excessive acrylamide monomer content, and achieve the effect of low production cost

Inactive Publication Date: 2020-07-10
SNF CHINA FLOCCULANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is basically no PAM used for drinking water treatment in my country. The main reason is that the production technology is backward and the content of acrylamide monomer exceeds the standard.

Method used

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  • Preparation method of food-grade polyacrylamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of food-grade polyacrylamide

[0040] Accurately weigh acrylamide, prepare an acrylamide solution with a concentration of 23wt% with deionized water, add sodium metasulfite and sodium acrylate with a total mass of 0.1% of the reactants, the mass ratio of sodium acrylate and acrylamide monomer is 1:3, and use 30wt% NaOH solution was poured into the reactor after adjusting the pH to 7. The reactor was placed in a constant temperature water bath for constant temperature (initial temperature 7° C.) and nitrogen was blown for 30 minutes. Add 0.2% modified silicone (3-aminopropyltriethoxysilane KH550) to the total mass of the reactants, and then add the corresponding initiator system reagents (chain transfer agent and redox agent): the added chain transfer amount is the reactant 0.03% of the total mass, the addition of redox agent is 40% of the total mass of reactants (potassium persulfate is the oxidizing agent, sodium bisulfite is the reducing agent, the ma...

Embodiment 2

[0044] (1) Preparation of food-grade polyacrylamide

[0045] Accurately weigh acrylamide, prepare an acrylamide solution with a concentration of 23wt% with deionized water, add sodium metasulfite and sodium acrylate with a total mass of 0.15% of the reactants, the mass ratio of sodium acrylate and acrylamide monomer is 1:2, and use 30wt% NaOH solution was poured into the reactor after adjusting the pH to 8. The reactor was placed in a constant temperature water bath to maintain a constant temperature (initial temperature 9° C.) and nitrogen was blown for 30 minutes. Add 0.2% of the total mass of the reactant modified silicone (3-aminopropyltriethoxysilane KH550), and then add the corresponding initiator system agent: the added chain transfer dose is 0.01% of the total mass of the reactant, redox The dosage of the reagent is 40% of the total mass of the reactants (potassium persulfate is the oxidizing agent, sodium bisulfite is the reducing agent, and the mass ratio of the oxi...

Embodiment 3

[0049] (1) Preparation of food-grade polyacrylamide

[0050] Accurately weigh acrylamide, prepare an acrylamide solution with a concentration of 23wt% with deionized water, add sodium metasulfite and sodium acrylate with a total mass of 0.2% of the reactants, and the mass ratio of sodium acrylate to acrylamide monomer is 1:2.5, and use 30wt% NaOH solution was poured into the reactor after adjusting the pH to 8. The reactor was placed in a constant temperature water bath to maintain a constant temperature (initial temperature 9° C.) and nitrogen was blown for 30 minutes. Add 0.4% of the total mass of the reactant modified silicone (3-aminopropyltriethoxysilane KH550), and then add the corresponding initiator system agent: the amount of chain transfer agent added is 0.02% of the total mass of the reactant, The amount of redox agent added is 20% of the total mass of reactants (potassium persulfate is the oxidizing agent, sodium bisulfite is the reducing agent, and the mass ratio...

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Abstract

The invention discloses a preparation method of food-grade polyacrylamide. The preparation method comprises the following steps: weighing acrylamide, preparing an acrylamide solution by using deionized water, adding sodium metabisulfite and sodium acrylate, adjusting the pH value to 7-8 with a NaOH solution, pouring into a reactor, putting the reactor into a constant-temperature water bath, keeping the temperature constant, introducing nitrogen, adding 3-aminopropyltriethoxysilane, adding a chain transfer agent and an oxidation-reduction agent, exhausting air in the reactor, and immediately sealing the reactor; adjusting the temperature to a hydrolysis temperature after reacting for a certain period of time, taking out a colloid sample after hydrolyzing for a period of time, and chopping,drying, crushing and sieving the colloid to obtain the food-grade polyacrylamide. According to the preparation method of the food-grade polyacrylamide, a novel initiating system is adopted, the cost is low, the process is environmentally friendly, and the synthesized anionic polyacrylamide meets the food-grade requirement.

Description

technical field [0001] The invention relates to the technical field of functional polymers, in particular to a preparation method of food-grade polyacrylamide. Background technique [0002] Polyacrylamide (PAM) is a highly cross-linked gel polymer formed by the addition reaction of acrylamide and vinyl. It is widely used in the fields of flocculation, thickening, drag reduction, adhesion, and scale inhibition as a "basic additive". PAM itself is not toxic to the human body and has little impact on the environment. Its toxicity comes from the residual acrylamide monomer and the toxic heavy metals entrained in the production. Therefore, the WHO stipulates that the dosage of polyacrylamide in water purification should not exceed 1mg / L. The residual amount of acrylamide monomer in the product group shall not exceed 0.02%. [0003] Domestically produced PAM is mainly used for oil extraction, although a small amount is also used for water treatment, but it is basically sewage tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F4/40C08F2/38
CPCC08F2/38C08F4/40C08F220/56C08F220/06
Inventor 谢克敏凌静高军尼古拉斯布瓦斯
Owner SNF CHINA FLOCCULANT
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