Coated controlled-release fertilizer and preparation method thereof
A technology of controlled-release fertilizers and coating materials, applied in the direction of layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc., can solve the problems that have not been found in the research and reports of nano-calcium carbonate modification, and have not been reported in patents and literature , uneven dispersion and other problems, to achieve the effect of improving the quality and effect of the coating, improving the mechanical properties, and simplifying the production process
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Embodiment 1
[0050] This example is a comparative example, and this example describes the preparation method of unmodified water-based polyacrylate-coated urea, and the coated controlled-release urea prepared by this method. The specific steps of the preparation method of coated controlled-release urea in the present embodiment are as follows:
[0051] The selection of step a, coating mother liquor:
[0052] In the laboratory, 100 g of water-based polymer polyacrylate emulsion was prepared by water-based technology, and its solid content was (49±1)%.
[0053] The preparation of step b, coating liquid:
[0054] The same amount of distilled water as the coating mother liquor was slowly added dropwise to the stirring coating mother liquor, and the stirring was continued for 15 min after all the drops were added. The coating solution prepared by mixing should be prepared and used immediately. The storage temperature should be 5℃~25℃, and the storage time should not be longer than 4h.
[005...
Embodiment 2
[0066] This example describes a method for preparing coated urea based on a 1% nano-calcium carbonate-modified water-based polyacrylate emulsion, and a coated controlled-release fertilizer prepared by this method. The specific steps of the preparation method of the coated controlled-release fertilizer in the present embodiment are as follows:
[0067] The selection of step a, coating mother liquor:
[0068] In the laboratory, 100 g of water-based polymer polyacrylate emulsion was prepared by water-based technology, and its solid content was (49±1)%.
[0069] The preparation of step b, coating liquid:
[0070] Add 100 g of distilled water to 0.5 g of nano-calcium carbonate, stir for 15 min, and then ultrasonicate for 30 min, slowly add dropwise to the stirring coating mother liquor, and continue to stir for 15 min after all the dropwise addition. The coating solution prepared by mixing should be prepared and used immediately. The storage temperature should be 5℃~25℃, and the ...
Embodiment 3
[0081] This example describes a method for preparing coated urea based on a 1% nano-calcium carbonate-modified water-based polyacrylate emulsion dispersed by sodium hexametaphosphate, and a coated controlled-release fertilizer prepared by the method. The specific steps of the preparation method of the coated controlled-release fertilizer in the present embodiment are as follows:
[0082] The selection of step a, coating mother liquor:
[0083] In the laboratory, 100 g of water-based polymer polyacrylate emulsion was prepared by water-based technology, and its solid content was (49±1)%.
[0084] The preparation of step b, coating liquid:
[0085] Add 100 g of distilled water and 0.5 g of sodium hexametaphosphate to 0.5 g of nano-calcium carbonate, then add and stir for 15 min and then ultrasonicate for 30 min. After ultrasonic treatment, slowly drop it into the stirring coating mother liquor, and continue to stir for 15 min after all the dropwise addition. The coating solutio...
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Abstract
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