Narrow-distribution middle-low-molecular-weight sodium polyacrylate preparation method
A sodium polyacrylate, low molecular weight technology, applied in the field of preparation of water-soluble electrolytes, can solve the problem of reaction temperature, monomer concentration initiator amount, feeding mode stirring speed, reaction time not strictly controlled, average relative molecular weight out of control, lack of products Unique performance and other issues, to achieve the effect of good heat dissipation, low manufacturing cost and high equipment utilization
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[0023] Implementation example 1: The preparation method of sodium polyacrylate (Mn=20900) of the present invention includes the following steps:
[0024] In the first step, at room temperature, add 31.36kg of acrylic acid monomer and 32L of water to the material kettle, stir well, add 0.32kg n-dodecanethiol and 0.47kg potassium persulfate, and stir well;
[0025] In the second step, the coiled tube reactor is placed in a constant temperature water bath at 60°C, and the temperature of the constant temperature water bath is controlled at 60±3°C; use a metering pump for the uniformly mixed materials in the first step, and adjust the output flow of the metering pump to 62L / h, the time for the material to circulate and react in the tube is 6h; after cooling the output material to room temperature, adjust the pH=7~8 with 30% sodium hydroxide solution;
[0026] In the third step, after the reaction, wash and dry to obtain sodium polyacrylate (Mn=20900, Mw=37620, PDI=1.80, solid content 52...
Example Embodiment
[0027] Implementation example 2: The preparation method of sodium polyacrylate (Mn=5750) of the present invention includes the following steps:
[0028] In the first step, at room temperature, add 28.56kg of acrylic acid monomer and 34L of water into the material kettle, stir well, add 0.48kg n-dodecanethiol and 0.47kg potassium persulfate, and stir well;
[0029] In the second step, the tubular reactor is placed in a constant temperature water bath of 70°C, and the temperature of the constant temperature water bath is controlled at 70±3°C; use a metering pump for the uniformly mixed materials in the first step, and adjust the output flow of the metering pump to 60L / h. Make the reaction time of the material in the tube 5h; after cooling the output material to room temperature, adjust the pH=7~8 with 30% sodium hydroxide solution;
[0030] In the third step, after the completion of the reaction, washing and drying to obtain sodium polyacrylate (Mn=5750, Mw=9260, PDI=1.61, solid conte...
Example Embodiment
[0031] Implementation example 3: The preparation method of sodium polyacrylate (Mn=5010) of the present invention includes the following steps:
[0032] In the first step, at room temperature, add 20.68kg of acrylic monomer and 22L of water to the material kettle, stir well, add 28.6L of isopropanol and 0.48kg of potassium persulfate, and stir well;
[0033] In the second step, the tubular reactor is placed in a constant temperature water bath of 70°C, and the temperature of the constant temperature water bath is controlled at 70±3°C; use a metering pump for the uniformly mixed materials in the first step, and adjust the output flow of the metering pump to 65L / h. Make the reaction time of the material in the tube 5h; After cooling the output material to room temperature, adjust the pH=7~8 with 30% sodium hydroxide solution;
[0034] In the third step, after the reaction is completed, washing and drying are performed to obtain sodium polyacrylate (Mn=5010, Mw=9930, PDI=1.98, solid co...
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