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Method for synthesizing polyacrylamide having low-molecular weight of 200000 to 450000

A technology of polyacrylamide and low molecular weight, which is applied in the field of polymer synthesis, can solve the problems of polyacrylamide, such as difficulty, safety, and large thermal effect of reaction, and achieve the effect of good water solubility, easy molecular weight, and simple operation

Active Publication Date: 2013-07-31
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high polymerization activity of acrylamide monomer and the large thermal effect of reaction, it is difficult to directly prepare low molecular weight polyacrylamide in laboratory synthesis and industrial production.
[0003] Low-molecular-weight polyacrylamide can be synthesized by precipitation polymerization, but the synthesis process uses a large amount of organic solvents, and there are certain unsafe factors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Monomer preparation: 100.0g of acrylamide aqueous solution with a mass percentage concentration of 40%, add 150.0g of water to prepare 250.0g of acrylamide aqueous solution with a mass percentage concentration of 16%, and dissolve 0.35g of ammonium persulfate in 10.0g of water to prepare persulfuric acid Ammonium initiator solution;

[0016] (2) Add 20.0g of acetone, 20g of the acrylamide monomer solution prepared above, 3.0g of EDTA solution with a mass percent concentration of 3%, and 1.2g of the ammonium persulfate initiator solution prepared above into a 500ml flask, stir, and gradually heat up To reflux, keep the reflux temperature for 10 minutes;

[0017] (3) While stirring and refluxing, continuously drop the remaining acrylamide monomer solution and the remaining ammonium persulfate initiator solution respectively from the constant pressure funnel, and complete the dropwise addition within 1.5 hours;

[0018] (4) Keep the reaction under reflux for 2 hours, ...

Embodiment 2

[0021] Same as Example 1, change the amount of acetone in step (2) to 15.0g, and distill off 15g of acetone and water mixture in step (4) to obtain a low molecular weight polyacrylamide aqueous solution, whose molecular weight is 28.9×10 4 .

Embodiment 3

[0023] Same as Example 1, change the amount of acetone in step (2) to 10.0g, and distill off 10g of acetone and water mixture in step (4) to obtain an aqueous solution of low molecular weight polyacrylamide, the molecular weight of which is 30.0×10 according to GB17514-1998. 4 .

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PUM

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Abstract

The invention discloses a method for synthesizing a polyacrylamide having low-molecular weight of 200000 to 450000, and belongs to the field of polymer synthesis. The method adopts an aqueous solution polymerization method, and utilizes C3-C4 ketone agents as a heat removal solvent and a chain transfer agent, ammonium persulfate as an initiator and ethylenediaminetetraacetic acid disodium salt asa stabilizing agent. The method comprises the following steps that a polymerization reaction is caused at a backflow temperature by continuous, respective and dropwise addition of an acrylamide solution and an initiator solution; and through adjustment on use amounts of the C3-C4 ketone agents and ammonium persulfate, the polyacrylamide having low-molecular weight of 200000 to 450000 is obtained.The polyacrylamide having low-molecular weight of 200000 to 450000 has good water solubility, and is suitable as a polymer co-emulsifier, a dispersant, an adhesive, a tackifier, a weaving auxiliary agent and the like.

Description

technical field [0001] The present invention relates to the synthesis method of high molecular compound polyacrylamide, especially relates to a kind of molecular weight (20~45)×10 4 A method for synthesizing low-molecular-weight polyacrylamide belongs to the field of polymer synthesis. Background technique [0002] Low molecular weight (molecular weight<100×10 4 ) Polyacrylamide is used as an adhesive, additive, dispersant, emulsifier, and tackifier in the fields of architectural decoration, papermaking, textiles, printing and dyeing, refractory materials, ceramics, and chemicals. Due to the high polymerization activity of acrylamide monomer and the large reaction heat effect, it is difficult to directly prepare low molecular weight polyacrylamide in laboratory synthesis and industrial production. [0003] Precipitation polymerization can be used to synthesize low-molecular-weight polyacrylamide, but the synthesis process uses a large amount of organic solvents, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/56C08F2/10
Inventor 赵献增曹金丽张彦昌李天仚王冬梅张文楠董学亮
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI