Potassium fertilizer controlled release coating agent

Abstract

The invention relates to a potash fertilizer controlled release coating agent. The potash fertilizer controlled release coating agent is prepared from dissolving, mixing, emulsifying and homogenizing a film-forming agent, an emulsifying agent, a plasticizer, a pore-foaming agent and solvent, and is suitable for coating of common particle potash fertilizer so that the potash fertilizer can be turned into coated potash fertilizer. The common potash fertilizer can be coated at the temperature of 0-45 DEG C, and the coating mass ratio is 1:2.5-4.5; a firm coating film can be formed on the surface of the common potash fertilizer in the coating process; the thickness, the film pore density and the film pore diameter of the coating film can be adjusted by adjusting the coating mass ratio and the dosage of the pore-foaming agent, and accordingly the coated potash fertilizer at different controlled release periods is obtained. The coated common particle potash fertilizer is applied to corn, rape, rice and cotton, the utilization rate of the potash fertilizer is increased by 26.2%-43.1%, and the yield of the corn, rape, rice and cotton is increased by 7.2%-15.1%. The production technique is simple, cost is low, coating is easy and convenient, and economic benefits, social benefits and ecological benefits are obvious.

Description

technical field [0001] The invention relates to a coating agent for potash fertilizer coating treatment to make it a controlled-release potassium fertilizer, and belongs to the fields of novel fertilizer preparation technology and crop cultivation technology. Specifically, it is a controlled-release coating agent for potassium fertilizer, which is prepared by dissolving, mixing, emulsifying and homogenizing film-forming agent, emulsifier, plasticizer, porogen and solvent. It is suitable for ordinary potassium fertilizer, especially granular potassium fertilizer Coating, making it a controlled release potash fertilizer. Background technique [0002] Since 1840, chemical fertilizers have been an important material basis for the development of agriculture around the world. However, after more than a hundred years of development, the release rate of chemical fertilizer nutrients has been unable to be controlled artificially. The release rate is too fast, and the crops will lose...

AI Technical Summary

Problems solved by technology

According to literature reports, although the existing two types of coated slow / controlled release fertilizers are effective in improving the nutrient utilization of fertilizers, they have the following main disadvantages: (1) the coating materials are expensive, the investment in equipment is large, and the production of fertilizers is difficult. The process is relatively complicated, and the coating process requires long-term high-temperature (100-170°C) treatment, which consumes a lot of energy and leads to high production costs for coated fertilizers. The price of coated fertilizers is 3-6 times that of ordinary fertilizers before coating

(2) Most of the coating materials currently used are difficult to degrade in the soil. With the application of coating fertilizers, they will exist in the soil for a long time, which will cause secondary pollution to the soil; and the coating materials need to use toluene and xylene Solvents with high toxicity such as dissolution are harmful to the health of production operators and easily cause air pollution

(3) Existing coated slow / controlled release fertilizers involve the slow / controlled release of nutrient nitrogen, and rarely consider the slow / controlled release of nutrient potassium; and the slow / controlled release of coated slow / controlled release fertilizers in the soil lags behind, Insufficient nutrient release in the early stage, crops cannot absorb enough nutrients in the early stage of growth, and excessive nutrients are released in the later stage, resulting in the release characteristics of nutrients being out of sync with the law of crop nutrient demand, and the loss of fertilizer nutrients is still relatively large

The role of potassium fertilizer in crops is very important, but potassium fertilizer is highly active, easily soluble in water, and easily lost with water, causing serious waste

At present, there are few studies on the coating of potassium fertilizers in production, and there are even fewer studies on its controlled release.

[0006] Due to the above reasons, the existing coated potassium fertilizers are rare and have a limited application range. They are mainly used for high-value economic crops such as flowers, fruits, lawns and tobacco, and are rarely used for field crops such as corn, rapeseed, rice, and cotton.

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