A kind of preparation method of polyacrylamide aqueous dispersion
A polyacrylamide and water-based dispersion technology, which is applied in the field of water-based polymer preparation, can solve the problems of low molecular weight of polyacrylamide emulsion, unsatisfactory emulsion stability, and increased synthesis cost, and achieve high molecular weight, fast dissolution speed, and economical cost effect
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Embodiment 1
[0026] (1) Preparation of cationic polymer:
[0027] Synthesis of polymethacryloyloxyethyltrimethylammonium chloride (A1): add methacryloxyethyltrimethylammonium chloride 80% aqueous solution (187.5g, 722mmol), VA-044 to the flask (0.15 g, 0.46 mmol) and water (1870 g). After degassing and deoxygenation, the reaction was carried out 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 polymethacryloyloxyethyldimethylbenzylammonium chloride (A2): add 80% aqueous methacryloyloxyethyldimethylbenzylammonium chloride (187.5g, 526mmol) to the flask , VA-044 (0.11 g, 0.33 mmol) and water (1870 g). After degassing and deoxygenation, the reaction was carried out 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 polymethacryloyloxyethyldimethylbenzylammonium chloride.
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Embodiment 2
[0052] Synthesis of cationic polyacrylamide aqueous dispersion: at room temperature, add acrylamide (36 g, 0.506 mol), ammonium sulfate (210 g, 1.59 mol), methacryloyloxyethene to a 1L three-necked flask equipped with a stirring paddle 80% aqueous solution of trimethylammonium chloride (1.8g, 6.93mmol), dispersion stabilizer 1 (216g), isooctyl methacrylate (2.0g, 10.07mmol) and water (243.3g), stir until all added completely dissolved. After degassing and deoxygenating, the temperature was raised to 45°C, and an aqueous solution of VA-044 (1 mL, 6.0 mg / mL) was added. The reaction was continued for 30 minutes, and then isooctyl methacrylate (1.6 g, 8.06 mmol, 0.016 eq.) and VA-044 aqueous solution (1 mL, 8.0 mg / mL) were added, and the total volume of the reaction system was about 550 mL. After continuing the reaction for 30 minutes, the heating source was removed to stop the reaction to obtain a cationic polyacrylamide aqueous dispersion with good fluidity. According to GB120...
Embodiment 3
[0054] Except that the dispersion stabilizer used is dispersion stabilizer 2, other conditions are the same as those in Example 2. As a result, 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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