Functional composite coated controlled-release fertilizer with polyolefin wax as priming coat and production method of functional composite coated controlled-release fertilizer

Abstract

The invention discloses a functional composite coated controlled-release fertilizer with a polyolefin wax as a priming coat. The functional composite coated controlled-release fertilizer comprises fertilizer granules and a coating material, wherein the coating material is sprayed to the surfaces of fertilizer granules; the coating material is composed of a polyolefin wax coating, a starch-based polyurethane layer and an epoxy resin layer which are sequentially sprayed to the surfaces of the fertilizer granules; biological stimulin is sprayed between the polyolefin wax coating and the starch-based polyurethane layer or between the starch-based polyurethane layer and the epoxy resin layer. By adopting the functional composite coated controlled-release fertilizer disclosed by the invention, the technical difficulties that a conventional international controlled-release fertilizer is single in function, high in cost and hard to popularize, the controlled-release effect of the fertilizer can be seriously affected by extrusion abrasion in the transportation process, soil pollution can be caused by harmful dyes, sustainable development is hard to achieve as the fertilizer depends on petrochemicals, and excessive residual macromolecule membranes are resulted and are slow to degrade, can be solved, moreover, the problems that the biological stimulin is liable to deactivation when beingin direct contact with soil and fertilizers, release paces of nutrients and stimulin are hard to regulate and control, and the like, can be solved.

Description

technical field [0001] The invention relates to the field of controlled-release fertilizer production, in particular to a functional compound-coated controlled-release fertilizer with polyolefin wax as an undercoat layer and a production method thereof. Background technique [0002] my country is a large agricultural country, but due to the large population base and the small area of ​​arable land, in order to meet the needs of food growth, a large amount of chemical fertilizers must be used in farming. However, most of the traditional chemical fertilizers are water-soluble, and they are easy to lose and decompose after being applied to the soil. Or fixed, so that the nutrient utilization rate is reduced, a large number of unreasonable fertilizer application not only caused a waste of resources but also caused environmental pollution. The invention, production and use of coated slow-release fertilizers can well solve the problems of waste of resources and environmental pollut...

AI Technical Summary

Problems solved by technology

The functional composite film-coated controlled-release fertilizer of the present invention is based on polyolefin wax as the base coat, starch-based polyurethane and epoxy resin composite film, and between the polyolefin wax coating and the starch-based polyurethane layer or the starch-based polyurethane layer Add biostimulant between the epoxy resin layer to realize the functional upgrade of the coated slow-release fertilizer, which solves the problem that the current international controlled-release fertilizer has a single function, high cost, difficult to promote, and extrusion wear during transportation, which seriously affects the fertilizer. Controlled release effect, soil pollution caused by adding harmful dyes, dependence on petrochemical products is difficult for sustainable development, and the key technical problems of slow degradation of excessive polymer film

At the same time, it solves the problems of easy inactivation of biostimulants in direct contact with soil and fertilizers, and difficulty in asynchronous regulation of nutrient and biostimulant release.

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