Preparation method of urea-wrapped cellulose-based super absorbent resin
A technology of water-absorbent resin and cellulose, which is applied in the field of material engineering, can solve the problems of low fertilizer adsorption and slow-release effect, and achieve the effects of improving the slow-release effect, increasing the adsorption amount, and low production cost
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Embodiment 1
[0021] 1) After crushing and sieving, the plant cellulose powder of pine wood with a particle size of ≤0.2mm is added to the deionized water to fully dissolve according to the reaction mass ratio of plant cellulose powder and deionized water of 1:35, and then the solution is transferred Put it into a three-necked flask with a condenser and a nitrogen device, heat and stir in a water bath at 75°C, and feed nitrogen at the same time; after 35 minutes, add ammonium persulfate according to the reaction mass ratio of plant cellulose powder and ammonium persulfate 1:0.4 The solution triggers free radicals. After 4 minutes, the reaction mass ratio of acrylamide to acrylic acid solution is 1:7, the reaction mass ratio of plant cellulose powder to the sum of acrylamide and acrylic acid is 1:12, and the reaction mass ratio of plant cellulose powder to N,N- The reaction mass ratio of methylbisacrylamide 1:0.07 is added in turn to the acrylic acid solution, acrylamide solution, and N,N-met...
Embodiment 2
[0024] 1) Add the plant cellulose powder of cypress with a particle size of ≤0.2mm after crushing and sieving to fully dissolve in deionized water according to the reaction mass ratio of plant cellulose powder and deionized water of 1:40, and then transfer the solution Put it into a three-necked flask with a condenser tube and a nitrogen device, heat and stir in a water bath at 85°C, and feed nitrogen at the same time; after 30 minutes, add ammonium persulfate according to the reaction mass ratio of plant cellulose powder and ammonium persulfate 1:0.25 The solution triggers free radicals. After 3 minutes, the reaction mass ratio of acrylamide to acrylic acid solution is 1:6, the reaction mass ratio of plant cellulose powder to the sum of acrylamide and acrylic acid is 1:12, and the reaction mass ratio of plant cellulose powder to N,N- The reaction mass ratio of methylbisacrylamide 1:0.06 was added in turn to the acrylic acid solution, acrylamide solution, and N,N-methylenebisac...
Embodiment 3
[0027] 1) After pulverization and sieving, the plant cellulose powder of Chinese fir with a particle size of ≤0.2mm is added to the deionized water to fully dissolve according to the reaction mass ratio of plant cellulose powder and deionized water of 1:35, and then the solution is transferred Put it into a three-necked flask with a condenser tube and a nitrogen device, heat and stir in a water bath at 80°C, and feed nitrogen at the same time; after 25 minutes, add ammonium persulfate according to the reaction mass ratio of plant cellulose powder and ammonium persulfate 1:0.35 The solution triggers free radicals. After 4 minutes, the reaction mass ratio of acrylamide to acrylic acid solution is 1:5, the reaction mass ratio of plant cellulose powder to the sum of acrylamide and acrylic acid is 1:11, and the reaction mass ratio of plant cellulose powder to N,N- The reaction mass ratio of methylbisacrylamide 1:0.07 is added in turn to the acrylic acid solution, acrylamide solution...
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