Carbon nanotube modified water-based polymer composite coating controlled-release fertilizer and preparation method thereof
A carbon nanotube modified, water-based polymer technology, applied in urea compound fertilizers, layered/coated fertilizers, fertilizer mixtures, etc., can solve problems such as insufficient film strength and poor water resistance
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Embodiment 1
[0106] a. The preparation of the polyacrylate emulsion was prepared according to the method described above without adding carbon nanotubes.
[0107] b. Configuration of coating solution: first pass the composite emulsion through a 200-mesh nylon net, then weigh 75g and mix it with an equal amount of distilled water. The mixed coating emulsion should be prepared and used immediately, and the storage temperature is 5℃~25℃, and the storage time should not be longer than 4h.
[0108] c. Production of coated fertilizer: use a bottom spray fluidized bed coating machine, such as the LDP-3 fluidized bed coating equipment produced by Jiangsu Changzhou Jiafa Drying Equipment Factory, and put granular fertilizer (about 270g) into the coating When the fertilizer fluidization is good, the coating liquid is pumped into the coating chamber through the peristaltic pump, and atomized and adhered to the surface of the fertilizer particles. After circulating up and down in the coating chamber, ...
Embodiment 2
[0116] In the preparation of the polyacrylate emulsion, 0.18 g of MWCNTs was added (the order and time of addition were as described above). The model film and coated fertilizer prepared from the nanocomposite emulsion obtained by this treatment are both marked as 0.1wt% MWCNTs. Compared with the original emulsion CK, the mechanical properties of the model film have changed significantly. The tensile strength is 7.04MPa, the elongation at break is 729.3%, the Young's modulus is 10.53MPa, and the Shore hardness is 85. Both the tensile strength and Young's modulus have increased, but the increase effect is not significant, the tensile strength has decreased slightly, and the hardness has increased, which all indicate that the addition of 0.1wt% MWCNTs improves the mechanical properties of the original emulsion, and the material The strength and toughness of the fertilizer are improved, and the ductility is slightly reduced, which is conducive to nutrient release; after the ferti...
Embodiment 3
[0118] In the preparation of the polyacrylate emulsion, 0.72 g of MWCNTs was added (the order and time of addition were as described above). The model film and coated fertilizer prepared from the nanocomposite emulsion obtained by this treatment are both labeled as 0.4wt% MWCNTs. The mechanical properties of the model film are more obvious than the original emulsion CK. Its tensile strength is 7.24MPa, elongation at break is 883.5%, Young's modulus is 6.07MPa, Shore hardness is 85, tensile strength and fracture The elongation has increased, but the increase effect is not significant, the Young's modulus has decreased significantly, and the hardness has increased, which shows that the addition of 0.4wt% MWCNTs further improves the mechanical properties of the original emulsion, and the strength and ductility of the composite material The properties and mechanical properties of the fertilizer are superior to those of the raw material, while the toughness of the film decreases, i...
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