Compound fertilizer controlled release coated agent

Abstract

The invention relates to a compound fertilizer controlled release coated agent, which is prepared from a film-forming agent, an emulsifier, a plasticizer, a porogenic agent and a solvent through steps of dissolving and mixing. The compound fertilizer controlled release coated agent is applicable to coating of a common granular compound fertilizer, so as to obtain a coated compound fertilizer. The coated agent provided by the invention can conduct coating on common granular compound fertilizer at -5 DEG C-40 DEG C, and has a coating weight ratio of 1:9 to 19; a firm coating can be formed on the surface of the common compound fertilizer during coating; the coating weight ratio and the usage amount of the porogenic agent can be adjusted to adjust the thickness of the coating, density and size of the coating, so as to obtain coated compound fertilizers for different release periods. The coated common granular compound fertilizer provided by the invention can be applied to rice and rape; and the coefficient of utilization of the compound fertilizer is increased by 28%-47%, and the yield of rice and rape is increased by 8.2%-15.5%. The invention has advantages of simple production, low cost and easy usage.

Description

technical field [0001] The invention relates to a coating agent used for coating treatment of compound fertilizer to make it a coated controlled-release fertilizer, and belongs to the fields of new fertilizer preparation technology and crop cultivation technology. Specifically, it is a compound fertilizer controlled-release coating agent, which is prepared by dissolving and mixing a film-forming agent, an emulsifier, a toughening agent, a porogen, and a solvent. Become a fertilizer coating treatment agent for coated controlled-release fertilizers. Background technique [0002] Since its inception in 1840, fertilizer has become a powerful force in the development of global agriculture. However, after more than 100 years of development, the release rate of fertilizer nutrients has been uncontrollable. The release rate is too fast, and the crops will lose it before they can absorb it, resulting in low fertilizer utilization rate, generally only 30% to 40%, and a large waste of...

AI Technical Summary

Problems solved by technology

According to literature reports, although the controlled-release effect of these two types of coated controlled-release fertilizers is relatively good, they have the following main shortcomings: (1) The coating materials are expensive, the equipment investment is large, the fertilizer production process is complicated, and the coating process It requires long-term high-temperature (80-170°C) treatment, which consumes a lot of energy and leads to high fertilizer production costs. The price of fertilizers is 5 to 14 times that of before coating.

(2) Toluene, xylene, turpentine and other petroleum solvents need to be used to dissolve the coating material, which is highly toxic and harmful to the health of production and application personnel; other solvents such as trichlorethylene and tetrachlorethylene will destroy the ozone layer. cause air pollution

According to reports, the sulfur contained in sulfur-coated urea can be converted into sulfuric acid in the soil, which has the potential danger of soil acidification; at the same time, sulfur can be converted into hydrogen sulfide and other harmful substances to crops in an anaerobic environment, so the sulfur-coated urea Fertilizers cannot be applied in paddy fields