Preparation method of coated fertilizer
A coating and fertilizer technology, which is applied in the direction of fertilizer mixture, analysis materials, fertilization equipment, etc., can solve the problems that the results cannot be evaluated in a timely and effective manner, the understanding of anti-caking slow-release coated fertilizers is insufficient, and the progress is slow.
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Embodiment 1
[0032] Such as Figure 1 to Figure 8 A kind of preparation method of coated fertilizer shown, comprises the following steps:
[0033] (1) Preparation of emulsion;
[0034] (2) using the emulsion prepared in step (1) to coat Sifang compound fertilizer to obtain coated fertilizer b;
[0035] (3) Test the anti-caking and slow-release performance of the coated fertilizer b, and compare it with the uncoated compound fertilizer a;
[0036] Wherein, the mass ratio of N, P and K in the Sifang compound fertilizer is 14.7:19.0:14.8.
[0037] In order to realize the preparation of the emulsion, in the step (1), the specific steps for preparing the emulsion are: add the surfactant Span-60 and Tween-80 (1:1) to the release factor aqueous solution at 80°C, heat Stir to make it completely mixed, under stirring, slowly add it to the melted paraffin, and add a few drops of tributyl phosphate defoamer, continue to stir at constant temperature for 2 hours, carefully observe the stability of t...
Embodiment 2
[0051] The difference between this example and Example 1 is that in step (1), the method of preparing the emulsion can also be: dissolve the surfactant Span-60 in the melted paraffin, and stir vigorously at a constant temperature of 80°C until uniform Obtain phase A; add surfactant Tween-80 into the aqueous solution containing the release factor, stir at constant temperature until uniformly obtained phase B, under the condition of vigorous stirring, add phase A to phase B, and add a few drops of tributyl phosphate ester defoamer and continued vigorous stirring for 2 hours to obtain the emulsion.
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