Compound fertilizer anti-caking agent with slow-release effect and compound fertilizer

Abstract

The invention discloses a compound fertilizer anti-caking agent with a slow-release effect and compound fertilizer in which the compound fertilizer anti-caking agent added. The compound fertilizer anti-caking agent is prepared from 10 to 20% of surfactant, 20 to 30 % of thickening time control agent, 45 to 55% of hydrophobic agent and 5 to 10% of sustained release agent, wherein the thickening time control agent is at least one of stearic acid, magnesium stearate and palmitic acid; the hydrophobic agent is at least one of talc, activated clay and diatomaceous earth; the sustained release agent is isobutylidene-diurea. The compound fertilizer anti-caking agent with the slow release effect disclosed by the invention has the effect of preventing hardening by coating the surfaces of particles to form an interfacial membrane and isolating the contact of the surfaces of the particles so as to not form a salt bridge, thereby reducing the moisture absorption rate obviously; at the same time, the isobutylidene-diurea is added to realize the slow release of the fertilizer without affecting the dissolution, and the raw materials are green and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of compound fertilizer additives, in particular to a compound fertilizer anti-caking agent and compound fertilizer with slow-release effect. Background technique [0002] Compound fertilizer is a fertilizer that integrates a variety of nutrients. Multiple organic / inorganic components will react repeatedly, so it is more likely to agglomerate during preparation and storage than single fertilizers, resulting in the gradual disappearance of its free flow. However, its quality is deteriorated, and it cannot meet the requirements of quality, including looseness, etc., which affects the application. In order to prevent the agglomeration of compound fertilizers, the usual measures are to adopt appropriate granulation equipment and drying process, or to apply various anti-caking agents to reduce the water content of the product. One of the more effective ways is to add various anti-caking functional additives. [...

AI Technical Summary

Problems solved by technology

[0003] At present, the anti-caking additives for compound fertilizers include powder type and oil-solvent type; among them, the powder type anti-caking agent uses inert powder to block the formation of crystal bridges between fertilizer particles, thereby inhibiting the moisture and salt between particles Particle re-agglomeration and agglomeration; but the inert powder makes the production process dusty, which increases the production process and cost, and oily substances need to be sprayed at the same time to improve the adhesion to the inert powder. The effect is not long-lasting, usually after 1~ After 2 months of storage, the surface of the particles will powder and change color

The oil-solvent type avoids the above defects, the process is simple and easy to use, but the mineral oil added is used as a solvent, and the amount of mineral oil is relatively large. The amount of mineral oil in each ton of compound fertilizer reaches 2-3kg, and these mineral oils enter with the fertilizer. The soil is difficult to degrade, which will cause pollution to the soil and the surrounding environment

In addition, compound fertilizers need to have a certain slow-release effect during use. The slow-release agent added during the original granulation process of the fertilizer is likely to react with other ingredients, resulting in a decrease in the slow-release effect; and compound fertilizer additives such as caking agents, At present, it is impossible not to improve the slow-release effect of fertilizers, which reduces the application effect of fertilizers.

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