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
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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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