Method for synthesizing cationic polyacrylamide by using ultraviolet initiated template copolymerization method

A technology of polyacrylamide and acrylamide monomers is applied in the field of synthesizing cationic polyacrylamide by using ultraviolet light-induced template copolymerization method, which can solve the problem that the cationic effect cannot be well reflected, the heat dissipation of the polymerization reaction is affected, and the polymerization reaction time is long. problems, to achieve the effects of easy control of the preparation process, long storage time, and short polymerization reaction time

Active Publication Date: 2013-04-24
SHENZHEN SHENSHUI WATER RESOURCES CONSULTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the temperature needs to be controlled at a constant temperature. If the temperature is too low, the reaction time will become longer, and if the temperature is too high, it will affect the heat dissipation of the polymerization reaction and consume energy; The "preparation method" is to add water to acrylamide monomer and quaternary ammonium salt with double bonds to form an aqueous solution system, add a chelating agent and an initiator to polymerize for 2 to 3 hours under the condition of 10 ° C ~ 40 ° C, and the rubber block obtained after the reaction Cationic polyacrylamide is obtained by granulation, drying and crushing
The disadvantage of this method is that the cations of the synthesized products are irregularly distributed on the molecular chain, the charge is dispersed, and the cationic effect cannot be well reflected in the application.
Moreover, temperature control is also required, and the polymerization reaction time is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: The method for synthesizing cationic polyacrylamide by template copolymerization method triggered by ultraviolet light, the specific steps are as follows:

[0032] In the first step, add 27.07ml of deionized water and 0.93ml of sodium polyacrylate (PAAS) solution with a molecular weight of 3000 to the reaction device in sequence (the concentration of the sodium polyacrylate solution is 1mol / L, and the concentration of the solution is based on sodium acrylate monomer , the amount of sodium polyacrylate substance is 9.29×10 -4mol, the amount of the substance is calculated as sodium acrylate monomer), acryloyloxyethyltrimethylammonium chloride (DAC) 1.8g (the amount of acryloyloxyethyltrimethylammonium chloride is 9.29×10 -3 mol, that is, PAAS:DAC =1:10, acryloyloxyethyltrimethylammonium chloride accounts for 15% of the total monomer mass), acrylamide monomer 10.2g (acrylamide monomer accounts for 85% of the total monomer mass) Stir evenly until completely dis...

Embodiment 2

[0037] Example 2: The method for synthesizing cationic polyacrylamide by template copolymerization method triggered by ultraviolet light, the specific steps are as follows:

[0038] In the first step, 13.93ml of deionized water and 6.07ml of sodium polyacrylate (PAAS) solution with a molecular weight of 5000 were added to the reaction device in sequence (the concentration of the sodium polyacrylate solution is 2.5mol / L, and the concentration of the solution is calculated by sodium acrylate monomer , the amount of sodium polyacrylate substance is 1.52×10 -2 mol, the amount of the substance is based on sodium acrylate monomer), methacryloyloxyethyltrimethylammonium chloride (DMC) 16g (the amount of methacryloyloxyethyltrimethylammonium chloride is 7.59 ×10 -2 mol, that is, PAAS: DMC = 1:5, methacryloxyethyltrimethylammonium chloride accounts for 80% of the total monomer mass), acrylamide monomer 4g (acrylamide monomer accounts for 20% of the total monomer mass ) and stir unt...

Embodiment 3

[0043] Example 3: The method for synthesizing cationic polyacrylamide by template copolymerization method triggered by ultraviolet light, the specific steps are as follows:

[0044] In the first step, 19.87ml of deionized water and 4.13ml of a polysodium methacrylate (PMAA) solution with a molecular weight of 5000 were sequentially added to the reaction device (the concentration of the sodium polymethacrylate solution was 2mol / L, and the concentration of the solution was expressed as methyl In terms of sodium acrylate monomer, the amount of sodium polymethacrylate is 8.26×10 -3 mol, the amount of the substance is based on sodium methacrylate monomer), acryloyloxyethyltrimethylammonium chloride (DAC) 0.8g (the amount of acryloyloxyethyltrimethylammonium chloride is 4.13× 10 -3 mol, that is, PMAA: DAC =2:1, acryloyloxyethyltrimethylammonium chloride accounts for 5% of the total monomer mass), acrylamide monomer 15.2g (acrylamide monomer accounts for 95% of the total monomer m...

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Abstract

The invention relates to a method for synthesizing cationic polyacrylamide by using ultraviolet initiated template copolymerization method. The method comprises the following steps of: adding de-ionized water, an anionic polymer, a cationic monomer and an acrylamide monomer sequentially in a reaction device, stirring uniformly until the components are fully dissolved, so as to form a monomer water solution; adding a proper amount of a solubilizer and an initiator into the monomer water solution, stirring uniformly, adjusting pH (potential of hydrogen) value, charging high pure nitrogen into the reaction device in order to exhaust the air; then sealing the reaction device and putting into an ultraviolet reaction device to initiate the polymerization, so as to generate cationic polyacrylamide colloid; and finally, purifying, washing and refining the colloid, drying in a vacuum drying box and then grinding, thereby obtaining an end product. The method has the advantages that the polymerization initiation time is short, relatively few types of assistants are added and the temperature is not needed to control, thus the production technology can be simplified, the energy consumption can be reduced and the cost can be reduced; and the product synthesized according to the method is concentrated in distribution of cationic groups, is high in cationic degree and molecular weight, is high in purity and is non-toxic and harmless.

Description

technical field [0001] The invention relates to a method for synthesizing high molecular polymers in an aqueous solution, in particular to a method for synthesizing cationic polyacrylamide by using ultraviolet light to initiate template copolymerization. [0002] Background technique [0003] Flocculation and sedimentation method is a simple and economical water treatment method, and the choice of flocculant is the core of flocculation and sedimentation method. Polyacrylamide flocculant (Polyacrylamide in English, abbreviated as PAM is an important organic flocculant, which is widely used in the pretreatment process of sewage treatment and sludge dewatering. According to the ionic characteristics, polyacrylamide can be Divided into cationic polyacrylamide, English is Cationic polyacrylamide, abbreviated as CPAM, anionic polyacrylamide, English is Anionic polyacrylamide, abbreviated as APAM, nonionic polyacrylamide, English is Nonionic polyacrylamide, abbreviated as NPAM, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F226/02C08F2/48C08F4/04
Inventor 郑怀礼郑晓楷关庆庆王亮刘力维孙永军范伟
Owner SHENZHEN SHENSHUI WATER RESOURCES CONSULTING CO LTD
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