Preparation method of polyacrylamide aqueous dispersion

A polyacrylamide and water-based dispersion technology, applied in the field of water-based polymer preparation, can solve the problems of low molecular weight of polyacrylamide emulsion, unsatisfactory emulsion stability, increased synthesis cost, etc., and achieves high molecular weight, fast dissolution speed, and economical cost effect

Active Publication Date: 2021-02-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the prepared polyacrylamide emulsion molecular weight of this patent is relatively low (2.7 * 10 6 ~3.5×10 6 Da), and the stability of the emulsion is not ideal, and delamination occurs wi

Method used

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  • Preparation method of polyacrylamide aqueous dispersion

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Effect test

Embodiment 1

[0026] (1) Preparation of cationic polymer:

[0027] Synthesis of polymethacryloyloxyethyltrimethylammonium chloride (A1): 80% aqueous solution of methacryloyloxyethyltrimethylammonium chloride (187.5g, 722mmol), VA-044 (0.15g, 0.46mmol) and water (1870g). After degassing and oxygen removal, react at 45°C for 7 hours. After cooling to room temperature, water (2620 g) was added to dilute to a 5 wt % aqueous solution of polymethacryloyloxyethyltrimethylammonium chloride.

[0028] Synthesis of polymethacryloyloxyethyl dimethyl benzyl ammonium chloride (A2): 80% aqueous solution (187.5g, 526mmol) of methacryloyloxyethyl dimethyl benzyl ammonium chloride was added in a flask , VA-044 (0.11 g, 0.33 mmol) and water (1870 g). After degassing and oxygen removal, react at 45°C for 7 hours. After cooling to room temperature, water (2620 g) was added to dilute to a 5 wt % polymethacryloyloxyethyl dimethyl benzyl ammonium chloride aqueous solution.

[0029] Synthesis of polyacryloxyet...

Embodiment 2

[0052] Synthesis of cationic polyacrylamide aqueous dispersion: at room temperature, add acrylamide (36g, 0.506mol), ammonium sulfate (210g, 1.59mol), methacryloyloxyethyl Trimethylammonium chloride 80% aqueous solution (1.8g, 6.93mmol), dispersion stabilizer 1 (216g), isooctyl methacrylate (2.0g, 10.07mmol) and water (243.3g), stirred until all added The substance is completely dissolved. After degassing and oxygen removal, the temperature was raised to 45°C, and VA-044 aqueous solution (1 mL, 6.0 mg / mL) was added. Continue the reaction for 30 minutes, then add isooctyl methacrylate (1.6g, 8.06mmol, 0.016eq.) and VA-044 aqueous solution (1mL, 8.0mg / mL), and the total volume of the reaction system is about 550mL. After continuing the reaction for 30 minutes, the heat source was removed to stop the reaction, and a cationic polyacrylamide aqueous dispersion with good fluidity was obtained. According to GB12005.1-89 polyacrylamide molecular weight determination method, the meas...

Embodiment 3

[0054] Except that the dispersion stabilizer used is dispersion stabilizer 2, other conditions are the same as in Example two, and the molecular weight of the obtained polymer is 6.12×10 6 Da. The aqueous dispersion can be stored at room temperature for 5 months without delamination, and the dispersion can be quickly and completely dissolved in water.

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Abstract

The invention discloses a preparation method of a polyacrylamide aqueous dispersion, which comprises the step of polymerizing a reaction system comprising acrylamide, an ionic monomer, a non-ionic monomer, a dispersion stabilizer, an inorganic salt and an initiator at a certain temperature for a period of time to obtain the polyacrylamide aqueous dispersion, wherein the dispersion stabilizer is acompound of an ionic polymer and an ionic polyacrylamide copolymer, and the non-ionic hydrophobic monomer and the initiator are added into the reaction system once or in several times. The prepared polyacrylamide aqueous dispersion has good stability and fluidity, the technological process is simple and convenient to operate, no organic solvent is added, and the polyacrylamide aqueous dispersion is green and environmentally friendly.

Description

technical field [0001] The invention relates to a method for preparing a polyacrylamide water-based dispersion, in particular to a method for preparing a high-molecular-weight polyacrylamide water-based dispersion polymer by a dispersion polymerization method, and belongs to the field of water-based polymer preparation. Background technique [0002] Polyacrylamide (CPAM) has good water solubility, high-efficiency thickening and unique adsorption, so it is widely used in many fields such as water treatment, oil recovery, papermaking, textile and so on. Solution polymerization is a common method for synthesizing such ionic polyacrylamides. However, the post-processing of the product of solution polymerization is complicated, and post-processing may cause denaturation of polyacrylamide. In addition, it takes a long time for the product of solution polymerization to dissolve, which cannot meet the requirement of instant polymer dissolution in specific cases. [0003] Aqueous p...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F220/18C08F2/20C08F220/28C08F220/60C08F220/06C08F220/58
CPCC08F220/56C08F2/20C08F220/34C08F220/60
Inventor 黄静李申振罗光美姚奕明张望清
Owner CHINA PETROLEUM & CHEM CORP
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