Preparation method for polyacrylic acid large-grain bead-shaped water absorbing resin
A technology of water-absorbent resin and large particles, which is applied in the field of reverse-phase suspension synthesis of polyacrylic acid-based large-particle bead-shaped water-absorbent resins, which can solve the problems of increased resin particle size factors, unfavorable industrial production, and increased synthesis steps, and achieve simplified synthesis steps and post-processing effects
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Embodiment 1
[0023] (1) Measure 55mL of carbon tetrachloride and 95mL of toluene, mix them into a continuous phase, add them into a 250mL three-necked flask, then add 0.16g of ethyl cellulose, stir in a water bath and heat up to 43°C to dissolve.
[0024] (2) Weigh 6 grams of acrylic acid and 10 mL of 6.25 mol / L sodium hydroxide solution, neutralize the two under cooling conditions, and place them at room temperature.
[0025] (3) Weigh 0.06 g of potassium persulfate, 0.09 g of N,N-methylenebisacrylamide, 0.03 g of sodium sulfite, and 10 g of distilled water, dissolve them and place them aside.
[0026] (4) After mixing all components of (2) and (3) evenly, quickly pour them into a three-neck flask, and stir and react at 64°C for 1 hour. After the reaction, cool to room temperature, filter, wash with methanol, and vacuum dry to obtain a large-particle bead-shaped water-absorbing resin.
[0027] The resin is white particles with an average particle diameter of 2.02 mm and a distilled water...
Embodiment 2
[0029] (1) Measure 67mL of carbon tetrachloride and 83mL of cyclohexane, mix them into a continuous phase, add them into a 250mL three-necked flask, then add 0.23g of ethyl cellulose, stir in a water bath and heat up to 46°C to dissolve .
[0030] (2) Weigh 8.4 grams of acrylic acid and 14 mL of 6.25 mol / L sodium hydroxide solution, neutralize the two under cooling conditions, and place them at room temperature.
[0031] (3) Weigh 0.17 g of potassium persulfate, 0.07 g of N,N-methylenebisacrylamide, 0.09 g of sodium sulfite, and 15 g of distilled water, dissolve them and place them aside.
[0032] (4) After mixing all components of (2) and (3) evenly, quickly pour them into a three-neck flask, and stir and react at 68°C for 50 minutes. After the reaction, cool to room temperature, filter, wash with methanol, and vacuum dry to obtain a large-particle bead-shaped water-absorbing resin.
[0033] The resin is white particles with an average particle diameter of 1.64 mm and a dis...
Embodiment 3
[0035] (1) Measure 60mL of carbon tetrachloride and 90mL of o-xylene, mix them into a continuous phase, add them into a 250mL three-neck flask, then add 0.43g of ethyl cellulose, stir in a water bath and heat up to 50°C to dissolve .
[0036] (2) Weigh 9.6 grams of acrylic acid and 16 mL of 6.25 mol / L sodium hydroxide solution, neutralize the two under cooling conditions, and place them at room temperature.
[0037] (3) Weigh 0.15 g of potassium persulfate, 0.06 g of N,N-methylenebisacrylamide, 0.07 g of sodium sulfite, and 19 g of distilled water, dissolve them and place them aside.
[0038] (4) After mixing all components of (2) and (3) evenly, quickly pour them into a three-necked flask, and stir and react at 60°C for 110 minutes. After the reaction, cool to room temperature, filter, wash with methanol, and vacuum dry to obtain a large-particle bead-shaped water-absorbing resin.
[0039] The resin is white particles with an average particle diameter of 1.23 mm and a disti...
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