Preparation method of low-molecular-weight ammonium polyacrylate

A technology of ammonium polyacrylate and low molecular weight, which is applied in the field of synthesis of polymer ammonium polyacrylate, can solve the problems that the heat of reaction cannot be diffused in time, the reaction process is difficult to control, and the difficulty of ammonium polyacrylate, etc., to overcome the problem of local crosslinking, The effect of maintaining product purity and facilitating industrial production

Inactive Publication Date: 2012-06-13
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 acrylic acid monomer and the large thermal effect of reaction, it is difficult to prepare low molecular weight ammonium polyacrylate in laboratory synthesis and industrial production.
It is technically feasible to directly synthesize low-molecular-weight ammonium polyacrylate by aqueous solution polymerization, but there are also some practical problems. For example, because the heat of reaction cannot be diffused in time, it is easy to cause partial crosslinking due to detonation polymerization, and the reaction process is not easy to control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Dissolve 2.52g of ammonium persulfate in 43.3g of water to form an initiator solution and mix it with 72.0g of acrylic acid solution with a mass fraction of 99%.

[0018] (2) Add 20.0g of isopropanol with a mass fraction of 99.5% and 40.0g of water into a 250ml flask, start stirring, gradually raise the temperature to 84°C for reflux, and maintain the reflux state for 10 minutes.

[0019] (3) While stirring and refluxing, continuously drop the mixture of acrylic acid monomer solution and ammonium persulfate initiator solution prepared above from the constant pressure funnel, and the addition is completed within 1.0 hour.

[0020] ⑷Keep reflux and react at constant temperature for 2 hours. Under normal pressure, distill out 20.0 g of the mixture of isopropanol and water, cool down to room temperature, slowly add ammonia water dropwise, adjust the pH of the system to 7-8, and obtain a low-molecular-weight ammonium polyacrylate aqueous solution. The isopropanol solvent...

Embodiment 2

[0023] Same as Example 1, change the amount of 99.5% isopropanol to 30.0g in step (2), and distill the amount of isopropanol and water mixture to 30.0g in step (4), and obtain low molecular weight ammonium polyacrylate according to GB / T 10533 -2000 measured its viscosity average molecular weight as 0.79×10 4 . The isopropanol solvent can be recycled.

Embodiment 3

[0025] Same as Example 1, change the amount of 99.5% isopropanol to 40.0g in step (2), and distill the amount of isopropanol and water mixture to 40.0g in step (4), and obtain low molecular weight ammonium polyacrylate according to GB / T 10533 -2000 measured its viscosity average molecular weight as 0.71×10 4 . The isopropanol solvent can be recycled.

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PUM

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Abstract

The invention discloses a preparation method of low-molecular-weight ammonium polyacrylate with viscosity average molecular weight of (0.3-1.0)*10<4>, and belongs to the field of polymer synthesis. The method is realized by adopting an aqueous solution polymerization method, and comprises the steps of: based on an alcohol solvent as a heat transfer solvent and a chain transfer agent as well as ammonium persulfate as an initiator, continuously dropwise adding a mixture of ammonium acrylate solution and the initiator, carrying out a polymerization reaction under reflux at the temperature of 80-90 DEG C, and synthesizing low-molecular-weight ammonium polyacrylate with viscosity average molecular weight of (0.3-1.0)*10<4> through adjusting the use amount of isopropanol and ammonium persulfate. Low-molecular-weight ammonium polyacrylate synthesized by the method has good water solubility, and is suitable for being used as a polymer dispersing agent, a scale and corrosion inhibitor, a water reducer and the like.

Description

technical field [0001] The invention relates to a method for synthesizing polymer compound ammonium polyacrylate, in particular to a method with a viscosity-average molecular weight of (0.3-1.0)×10 4 A method for synthesizing low-molecular-weight ammonium polyacrylate belongs to the field of polymer synthesis. Background technique [0002] Low molecular weight (viscosity average molecular weight<1.0×10 4 ) Ammonium polyacrylate is used as a dispersant, scale and corrosion inhibitor, and water reducer, and is used in papermaking, textiles, construction, ceramics, and industrial circulating water systems. Due to the high polymerization activity of acrylic acid monomers and the large reaction heat effect, it is difficult to prepare low-molecular-weight ammonium polyacrylate in laboratory synthesis and industrial production. It is technically feasible to directly synthesize low-molecular-weight ammonium polyacrylate by aqueous solution polymerization, but there are also som...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/06C08F2/38C08F8/44
Inventor 李天仚张彦昌曹金丽王冬梅赵献增张文楠董学亮
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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