Moisture-retention sustained and controlled release fertilizer and method of preparing the same

Abstract

The invention discloses a water holding slow-controlled releasing fertilizer and a preparation method thereof, belonging to the technical field of agricultural fertilizers and preparation thereof. Macromolecule coating fertilizer is taken as an inner core and a water holding layer is taken as an outside layer to form a double-coating water holding slow-controlled releasing fertilizer; an inner coating is macromolecule protective layer coating material with nutrition controlling and releasing property; an outside coating is the water holding layer with excellent water holding property. Water retention agent suspension liquid is sprayed to the surface of macromolecule coating fertilizer grains for outside coating; wherein the water retention agent is prepared by taking cyclohexane, emulsifier, acrylic acid, acrylamide, sodium hydroxide, cross linker and evocating agent and adopting the method of opposite phase suspension polymerization. The fertilizer has the function of controlled releasing, drought resistance, water saving, water holding and soil improving and the advantages of high absorption percentage, wear resistance, difficult falling and the like; utilization ratio of liquidmanure is improved and the fertilizer can be widely used to desert control, lawn plant, soil improvement, gardening, agriculture and forestry and the like.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizers and their preparation, in particular to a water-retaining slow-release fertilizer and a preparation method thereof. Background technique [0002] my country is a large agricultural country, and the proportion of chemical fertilizers in agricultural production investment accounts for about 50%, but the utilization rate of fertilizers in our country is only 30%, which causes a huge waste of economic energy and various environmental problems. Therefore, slow and controlled release fertilizers have become the development direction of agricultural fertilizers in the future, and polymer coated fertilizers are called real slow and controlled release fertilizers by relevant experts. It uses polymer materials to form a film on the surface of fertilizers, controls the dissolution rate of fertilizers in the soil, and makes the dissolution rate consistent with the growth needs of plants, so a...

AI Technical Summary

Problems solved by technology

[0006] At present, the water-retaining slow-release and controlled-release fertilizers reported in existing articles and published patents have the following problems: the preparation of part of the water-retaining slow-release / controlled-release fertilizers uses slow-release and controlled-release fertilizers in the reactor, triggering polymerization encapsulation A layer of water-retaining agent is limited to the laboratory scale, and the scale-up production cannot be realized in the process, which greatly limits its large-scale industrial production

The new water-retaining slow-release fertilizer and its preparation process involved in the present invention have not been reported at home and abroad, and have not been used in China.