Water-retaining high-molecular slow-release nitrogen-potassium fertilizer and preparation method thereof
A high-molecular, water-retaining technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of backwardness in the research field of water-retaining slow-release fertilizers, achieve excellent nutrient slow and controlled release performance, raw materials are cheap and easy to obtain, and reduce cost effect
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Embodiment 1
[0029] A preparation method of water-retaining polymer slow-release nitrogen and potassium fertilizer, the steps of which are:
[0030] (1) Add potassium hydroxide solution and acrylic acid (the mass fraction of potassium hydroxide is 20%, and the molar ratio of potassium hydroxide and acrylic acid is 1:1) in the reaction vessel, and stir in an ice bath for 15 minutes until they are evenly mixed; then add The molar ratio of urea to acrylic acid is 1.8:1, stir for 20 minutes until the urea is completely dissolved; then add 0.5% of the mass of acrylic acid initiator potassium persulfate, and stir for 30 minutes until the potassium persulfate is completely dissolved; then add 0.02% of the mass of acrylic acid % cross-linking agent N,N'-methylenebisacrylamide, stir for 20 minutes until the cross-linking agent is completely dissolved, and continue stirring for 30 minutes until the solution is evenly mixed;
[0031] (2) The uniformly mixed solution is sealed, reacted at 75° C. for 2...
Embodiment 2
[0033] A preparation method of water-retaining polymer slow-release nitrogen and potassium fertilizer, the steps of which are:
[0034] (1) Add potassium hydroxide solution and acrylic acid (the mass fraction of potassium hydroxide is 20%, and the molar ratio of potassium hydroxide and acrylic acid is 0.85:1) in the reaction vessel, and stir in an ice bath for 30 minutes until they are evenly mixed; then add The molar ratio of urea to acrylic acid is 0.8:1, stir for 15 minutes until the urea is completely dissolved; then add 2.5% initiator potassium persulfate of the mass of acrylic acid, stir for 15 minutes until the potassium persulfate is completely dissolved; add 0.01% of the mass of acrylic acid % cross-linking agent N,N'-methylenebisacrylamide, stir for 20 minutes until the cross-linking agent is completely dissolved, and continue stirring for 30 minutes until the solution is evenly mixed;
[0035] (2) The uniformly mixed solution is sealed, reacted at 45°C for 4 hours, ...
Embodiment 3
[0037] A preparation method of water-retaining polymer slow-release nitrogen and potassium fertilizer, the steps of which are:
[0038] (1) Add potassium hydroxide solution and acrylic acid (the mass fraction of potassium hydroxide is 20%, and the molar ratio of potassium hydroxide and acrylic acid is 0.95:1) in the reaction vessel, stir in the ice bath for 20min until the mixture is uniform; then add The molar ratio of urea to acrylic acid is 1:1, stir for 20 minutes until the urea is completely dissolved; then add 2.5% initiator potassium persulfate of the mass of acrylic acid, stir for 20 minutes until the potassium persulfate is completely dissolved; add 0.01% of the mass of acrylic acid % cross-linking agent N,N'-methylenebisacrylamide, stir for 15 minutes until the cross-linking agent is completely dissolved, continue stirring for 30 minutes, until the solution is evenly mixed;
[0039] (2) The uniformly mixed solution is sealed, reacted at 45° C. for 4 hours, granulated...
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