Nano-composite coating liquid for fertilizer, coated controlled-release fertilizer and preparation method of coated controlled-release fertilizer

Abstract

The invention discloses a nano-composite coating liquid for a fertilizer, a coated controlled-release fertilizer and a preparation method of the coated controlled-release fertilizer, and belongs to the field of fertilizer preparation. The coating liquid is prepared from the following raw materials in parts by mass: 30-36 parts of liquefied straw, 0.8-1.2 parts of a natural nano material and 62-66parts of a curing agent. According to the invention, under the action of an external magnetic field, the coating liquid is sprayed onto the surface of preheated granular fertilizer, coating treatmentis performed at 50-75 DEG C, and curing is performed to obtain the coated controlled-release fertilizer; and the coated controlled-release fertilizer prepared by the method has excellent mechanical properties, the coating material has a proper degradation period, the fertilizer has excellent controlled-release performance, and the coated controlled-release fertilizer is wide in raw material sourceand simple in preparation process, and has important popularization significance in the aspect of controlled-release fertilizers.

Description

technical field [0001] The invention relates to the technical field of fertilizer preparation, in particular to a nanocomposite coating liquid for fertilizer, coated controlled-release fertilizer and a preparation method thereof. Background technique [0002] Fertilizer is an important means of production to ensure the increase of output in agricultural production. With the increasing food demand of human beings, the amount of chemical fertilizer is also increasing. According to statistics, the role of chemical fertilizers in increasing crop yields accounts for 40%-60%. my country is a country with a large production capacity of chemical fertilizers and a large consumption of chemical fertilizers, but the average utilization rate of chemical fertilizers in the current season is less than 40%. The low fertilizer utilization rate not only wastes resources, but also causes serious pollution to the environment. Therefore, there is an urgent need to develop a new type of green f...

AI Technical Summary

Problems solved by technology

According to statistics, the role of chemical fertilizers in increasing crop yields accounts for 40%-60%. my country is a country with a large production capacity of chemical fertilizers and a large consumption of chemical fertilizers, but the average utilization rate of chemical fertilizers in the current season is less than 40%.

[0003] The advent of coated controlled-release fertilizers solves the above two problems at the same time. However, the complicated process and high-cost raw materials of the coated materials make it expensive. At present, it can only be used on high-value lawns and flowers, and has not been widely used. Another major reason is that the residual film of traditional coated controlled-release fertilizers cannot be degraded, which will cause secondary pollution to the environment

[0004] Although there are some studies on the use of degradable natural polymer materials as fertilizer coating materials, natural polymer materials are easily affected by the environment, so they are easily degraded, and the controlled release performance of fertilizers is poor. The mechanical properties of the material-coated fertilizer are not strong, the core fertilizer dissolves and easily forms a high pressure in the film, and the film material cannot withstand the pressure in the film and easily forms cracks or ruptures to release the fertilizer quickly, thus limiting its large-scale application