Preparation method of polyacrylic acid large-particle size bead-like water-absorbent resin
A technology of water-absorbent resin and polyacrylic acid, which is applied in the field of preparation of water-absorbent resin, can solve the problems of uncontrollable size, unevenness, and small particle size, and achieve the effect of controllable size and uniform particle size
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Embodiment 1
[0019] 1. Take 9 grams of acrylic acid, prepare an aqueous solution with a mass concentration of 18% with distilled water, weigh 5 grams of sodium hydroxide, prepare an aqueous solution with a mass concentration of 25% with distilled water, and add the sodium hydroxide solution dropwise to the acrylic acid solution Neutralize in medium, adjust the pH to 6, cool to 30°C, then weigh 30 grams of acrylamide and dissolve it in the neutralization solution to prepare a polymerization solution with a mass content of 42%, add 0.009 grams of ammonium persulfate, add 0.0072 grams N,N-methylenebisacrylamide, mix the system evenly, and adjust the temperature to 10°C;
[0020] 2. Weigh 25 grams of sucrose fatty acid calcium and 25 kilograms of white oil, mix them evenly, add them to the polymerization kettle, open the steam valve for heating, and raise the temperature to 86°C;
[0021] 3. Add the water phase to the oil phase for suspension polymerization and granulation. After the polymeriz...
Embodiment 2
[0023] 1. Take 9 grams of acrylic acid, prepare an aqueous solution with a mass concentration of 18% with distilled water, weigh 5 grams of sodium hydroxide, prepare an aqueous solution with a mass concentration of 25% with distilled water, and add the sodium hydroxide solution dropwise to the acrylic acid solution Neutralize in medium, adjust the pH to 6, cool to 29°C, then weigh 30 grams of acrylamide and dissolve it in the neutralization solution to prepare an aqueous solution with a mass content of 42%, add 0.012 grams of potassium persulfate, 0.009 grams of N, N-methylenebisacrylamide, mix the system evenly, and adjust the temperature to 11°C;
[0024] 2. Weigh 20 grams of sodium sucrose fatty acid and 25 kilograms of vegetable oil, mix them evenly, add them to the polymerization kettle, open the steam valve to heat, and raise the temperature to 88°C;
[0025] 3. Add the water phase to the oil phase for suspension polymerization and granulation. After the polymerization i...
Embodiment 3
[0027] 1. Take 9 grams of acrylic acid, prepare an aqueous solution with a mass concentration of 18% with distilled water, weigh 5 grams of sodium hydroxide, prepare an aqueous solution with a mass concentration of 25% with distilled water, and add the sodium hydroxide solution dropwise to the acrylic acid solution Neutralize in medium, adjust the pH to 6, cool to 28°C, then weigh 27 grams of acrylamide and dissolve it in the neutralization solution to prepare an aqueous solution with a mass content of 39%, add 0.016 grams of ammonium persulfate, 0.0054 grams of N, N-methylene bisacrylamide, 0.15 g of pigment, mix the system evenly, and adjust the temperature to 12°C;
[0028] 2. Weigh 15 grams of stearic acid and 25 kilograms of animal oil, mix them evenly, add them to the polymerization kettle, open the steam valve to heat, and raise the temperature to 85°C;
[0029] 3. Add the water phase to the oil phase for suspension polymerization and granulation. After the polymerizati...
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