Cellulose-based coated fertilizer and preparation method thereof

Abstract

The invention belongs to the technical field of fertilizers, and discloses a cellulose-based coated fertilizer and a preparation method thereof. The cellulose-based coated fertilizer comprises a fertilizer core and a coated layer, wherein the coated layer wraps the outside of the fertilizer core; the fertilizer core comprises a granular fertilizer and an additive; and the coated layer comprises celluloses and a solvent for dissolving the celluloses. The releasing speed of the cellulose-based coated fertilizer is low, the releasing period of the fertilizer can be prolonged, slow absorption andutilization of a root system are facilitated, high yield of crops is promoted, meanwhile, a water retaining function is fulfilled, a soil environment can be improved, furthermore, the coated materialis formed quickly, the efficiency is high, a drying procedure is not required, sieving is not required either, waste residues are not produced in a production process, and an ecological environment isprotected favorably.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a cellulose-based coated fertilizer and a preparation method thereof, in particular to a cellulose-based coated fertilizer with water retention and slow-release functions and a preparation method thereof. Background technique [0002] Fertilizer is one of the most important means of production in agricultural production and the material basis for crop growth. Most of the chemical fertilizers currently used in agricultural production are water-soluble quick-acting fertilizers, and the utilization rate of quick-acting fertilizers is very low because they are easy to lose, decompose and fix. For example, ordinary nitrogen fertilizers and compound fertilizers are easily decomposed when applied to the soil, nitrogen volatilization and soil leaching occur, resulting in waste loss of chemical fertilizers, greenhouse effect and non-point source pollution, resulting in low...

AI Technical Summary

Problems solved by technology

The solvent-based coating used in the past has insufficient solvent recovery, and the film is made of discarded plastics, so the degradation is poor, the environment is polluted, and there is a fatal problem of unstable fertilizer release. The initial release is very fast (caused by surface defects), and the later release is slow. Very slow, the resulting curve is fast first and then slow, just the opposite of the S-curve that plants like

The main problem of sulfur-coated urea using sulfur is that sulfur is easy to be brittle. Once broken, it is as if it is not coated; if it is not broken, nutrients will not be released. The shortest release period is 7 days, and the release period can reach 180 days through modification. Technology and materials The requirements are high, so the price is expensive, and it is difficult to promote and apply at home and abroad

Resin coatings, such as polyurethane materials, alkyd resins, epoxy resin materials, etc., can achieve sustained release without being affected by soil moisture. The release rate of the day and night is less than 15%, and the release rate of one month is less than 75%. The release rate during the growth period is not less than 80%; but the disadvantage is that the price is high and the degradation is poor. Generally, the market price is 20,000-30,000 yuan per ton

In addition, the soil produced by long-term application of resin coating still has certain ecological risks

Therefore, the common disadvantages of several commonly used coated fertilizers are that the cost is high, and the release rate is difficult to control, which limits their large-scale promotion.