Preparation method of composite coated water retaining and slowly-releasing urea
A slow-release urea and coating technology, which is applied in the field of preparation of composite-coated water-retaining slow-release urea, can solve the problems of water absorption, poor slow-release performance, salt-intolerant water-retaining agent, easy moisture absorption of film materials, etc. Utilization, easy storage and transportation, reduced evaporation effect
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Embodiment 1
[0031] The preparation method of the compound coated water-retaining slow-release urea of this embodiment, the method used comprises the following steps:
[0032] (1) Weigh 300g of acrylic acid monomer into the reactor, stir evenly, slowly add 207g of ammonia water, so that the neutralization degree of acrylic acid reaches 80%; then add 200g of acrylamide monomer, 0.5g of N,N-methylenebis Acrylamide, after fully dissolving and mixing, add 8g of ammonium persulfate, react at 80°C for 1-2 hours, cut the reaction product into pieces, dry, pulverize, and sieve to obtain a powdery water retaining agent with a particle size of less than 0.075mm.
[0033] (2) 468g of 2% chitosan solution and 32g of 10% polyvinyl alcohol solution were fully stirred and mixed, and 1ml of 40% glutaraldehyde was added, stirred and mixed to obtain a coating solution.
[0034] (3) Weigh 5kg of urea and put it into the coating equipment. At the same time, heat the reaction material with hot air, keep the ...
Embodiment 2
[0037] The preparation method of the composite coating water-retaining slow-release fertilizer of the present embodiment, the method used comprises the following steps:
[0038] (1) Weigh 600g of acrylic acid monomer into the reactor, stir evenly, slowly add 453g of ammonia water, so that the neutralization degree of acrylic acid reaches 80%; then add 400g of 2-acrylamido-2-methylpropanesulfonic acid monomer in turn , 1.2g N,N-methylenebisacrylamide, fully dissolved and mixed, add 20g ammonium persulfate, 80℃, react for 1~2h, cut the reaction product into pieces, dry, crush, and sieve to obtain a particle size of less than 0.075 mm powdered water retaining agent.
[0039] (2) 468g of 2% chitosan solution and 32g of 10% polyvinyl alcohol solution were fully stirred and mixed, and 1.2ml of 40% glyoxal was added, stirred and mixed to obtain a coating solution.
[0040] (3) Weigh 5kg of urea and put it into the coating equipment. At the same time, heat the reaction material with ...
Embodiment 3
[0043] The preparation method of the compound coated water-retaining slow-release urea of this embodiment, the method used comprises the following steps:
[0044](1) Weigh 540g of acrylic acid monomer and add it to the reactor, stir evenly, slowly add 408g of ammonia water, so that the neutralization degree of acrylic acid reaches 80%; then add 360g of acrylamide monomer, 100g of 2-acrylamide-2-methyl Propanesulfonic acid monomer, 1.2g N,N-methylenebisacrylamide, after fully dissolved and mixed, add 20g ammonium persulfate, 80℃, react for 1~2h, cut the reaction product into pieces, dry, pulverize, Sieve to obtain a powdery water-retaining agent with a particle size of less than 0.075 mm.
[0045] (2) 468g of 2% chitosan solution and 32g of 10% polyvinyl alcohol solution were fully stirred and mixed, and 1.2ml of 40% glyoxal was added, stirred and mixed to obtain a coating solution.
[0046] (3) Weigh 5kg of urea and put it into the coating equipment. At the same time, heat ...
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