Prepn of low molecular weight polyacrylamide

A polyacrylamide, low molecular weight technology, used in amide/imide polymer adhesives, adhesive types, coatings, etc. problems such as low efficiency, to achieve the effect of good water solubility, low molecular weight, and easy control

Inactive Publication Date: 2007-01-03
QUALITY TEST & ANALYTIC MEASUREMENT RES CENT HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main inventor of this technology once used isopropanol as chain transfer agent and heat transfer solvent in ZL03126303.8, and when the monomer mass concentration was 30%, a compound with a molecular weight of 4 polyacrylamide, minimum 2.6 x 10 4 , but it is difficult to synthesize polyacrylamide with lower molecular weight, the monomer concentration cannot be further increased, and there are problems of low production efficiency and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) 200g mass percent concentration is that 40% acrylamide aqueous solution and 5g sodium formate are mixed and dissolved to make monomer solution, and 0.6g ammonium persulfate is dissolved in 10g water to make initiator solution.

[0015] (2) In a 0.5L four-neck flask equipped with electric stirring, constant pressure funnel, thermometer and reflux condenser, add 50g of 95% ethanol, 20g of the monomer solution prepared above, 2g of EDTA solution with a mass concentration of 3%, 1.2g The above-prepared ammonium persulfate initiator solution was started to stir, and the temperature was gradually raised to reflux at 80° C., and the reflux temperature was maintained for 10 minutes.

[0016] (3) Under the condition of keeping stirring and refluxing, continuously drop the remaining monomer solution and the remaining initiator solution respectively from the constant pressure funnel, and finish dropping within 2 hours.

[0017] (4) keep the reaction under reflux for 2 hours, u...

Embodiment 2

[0020] Same as Example 1, changing the amount of sodium formate to 8g, the obtained low molecular weight polyacrylamide solution has a molecular weight of 2.07×10 according to GB17514-1998. 4 .

Embodiment 3

[0022] Same as Example 1, changing the amount of sodium formate to 15g, the obtained low molecular weight polyacrylamide has a molecular weight of 1.47×10 according to GB17514-1998. 4 .

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PUM

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Abstract

The present invention discloses preparation process of low molecular weight polyacrylamide, and the preparation process is one water solution polymerization process with ethanol as heat transferring solvent, sodium formate as chain transferring agent, ammonium persulfate as initiator, and EDTA disodium salt as stabilizer. Through continuously dropping of acrylamide solution and initiator solution, reflux polymerization at 80-90 deg.c and regulating the consumption of sodium formate and initiator, polyacrylamide of molecular weight (1.0-2.6)*10<4> is synthesized. Thus synthesized low molecular weight polyacrylamide has excellent water solubility, and is suitable for use as polymer emulsifier, dispersant, adhesive, etc.

Description

technical field [0001] The invention relates to a synthesis method of a polymer compound polyacrylamide, in particular to a synthesis method of a low molecular weight polyacrylamide. Background technique [0002] Low molecular weight (molecular weight<20×10 4 ) Polyacrylamide is used as an adhesive and additive in architectural decoration, papermaking, textile, printing and dyeing, ceramics, adhesive materials, chemical industry and other fields. Due to the high polymerization activity of acrylamide monomer and the large heat of reaction, it is difficult to prepare low molecular weight polyacrylamide in industrial production and laboratory synthesis. There are reports in China that low-molecular-weight polyacrylamide is synthesized by precipitation polymerization, but the synthesis steps are cumbersome, the process is complicated, and a large amount of organic solvents are used, which is not conducive to safe production. It is more feasible to synthesize low-molecular-w...

Claims

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Application Information

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IPC IPC(8): C08F120/56C09D133/26C09J133/26D21H13/34
Inventor 赵献增王冬梅李天仚崔惠芳张文楠朱靖
Owner QUALITY TEST & ANALYTIC MEASUREMENT RES CENT HENAN ACAD OF SCI
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