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A kind of light-cured coated controlled-release fertilizer and preparation method thereof

A controlled-release fertilizer and coating technology, which is applied in layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc., can solve the problems of high production technology content, non-degradability, and complex processes, and achieves improved nutrient utilization and improved nutrient utilization. The effect of nutrient release period and simple processing technology

Active Publication Date: 2022-04-12
SHANDONG AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of controlled-release fertilizers currently on the market is relatively high. On the one hand, because most of its coating materials are derived from non-renewable resources such as petroleum and are not degradable in the soil, it also causes a certain degree of damage to the soil while achieving the purpose of slow-release nutrients. Pollution
On the other hand, because of its high production technology, complicated process and expensive equipment, the price of controlled release fertilizer is relatively expensive.
At present, the preparation of controlled-release fertilizers with bio-based materials as coating materials has become a hot spot, but its production process is still traditional heating and curing, which not only consumes too much energy and increases costs, but also takes a long time to cure. The process of continuous adhesion and tearing leads to uneven distribution of membrane materials on the surface of fertilizer particles and unsatisfactory controlled release effect
In the production process of traditional controlled-release fertilizers, in order to distribute the film material on the surface of the granular fertilizer evenly, multiple nozzles are often used to spray together, which will lead to waste of film coating materials and increase production costs

Method used

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  • A kind of light-cured coated controlled-release fertilizer and preparation method thereof

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preparation example Construction

[0033] Based on this, the present invention provides a heat-free, ultraviolet-cured coated controlled-release fertilizer. In one embodiment of the present invention, the preparation method of the coated controlled-release fertilizer of this heating-free ultraviolet light curing is provided, comprising the following steps:

[0034] (1) Mechanically pulverize the waste branches of fruit trees to make powder. With the participation of acid catalyst (fluorine sulfonic acid), mix them according to the weight ratio of fruit tree waste branches powder and liquefaction agent A at 1:1~10 and add them to the magnetic stirring high pressure reaction. In the kettle, the acidic catalyst is 5%-7% of the total weight of the fruit tree waste branch powder and the liquefaction agent, and the temperature is raised to 250-350° C., and the liquefaction product of the fruit tree waste branch can be obtained by stirring continuously for 90 minutes; the liquefaction agent A It is a mixture of one or...

Embodiment 1

[0052] The waste branches of fruit trees (waste branches of apple trees) are mechanically pulverized and made into powder. Take by weighing 1000g powder, join in the magnetic stirring autoclave, add 540g fluorosulfonic acid as catalyzer, add 8000g liquefaction agent (supercritical dihydroergocalciferol and supercritical ergocalciferol mix uniformly by weight 4:1 as Liquefaction agent), under the condition of stirring, open the liquefier and rapidly raise the temperature to 290°C, and continue to stir and react for 90 minutes to obtain the liquefaction product of fruit tree waste. Add the liquefied product to a decolorizing column with a diameter of 10 cm and a length of 50 cm equipped with decolorizing agent B (decolorizing agent B is mesoporous micron activated carbon, magnesium oxide and iron oxide are mixed uniformly in a weight ratio of 4:1:1) , after the liquefied product slowly flows out, the decolorized liquefied product is obtained. Mix the decolorized liquefied produ...

Embodiment 2

[0054] The fruit tree waste branches (peach tree waste branches) are mechanically crushed to make powder. Take by weighing 1500g powder, join in the magnetic stirring autoclave, add 475g fluorosulfonic acid as catalyst, add 8000g liquefaction agent (supercritical dihydrosinacinol, supercritical tetrahydrofuran-oxypropylene copolymerized glycol and supercritical ergocalciferol Mix evenly according to the weight ratio of 1:1:1 and use it as a liquefaction agent), under the condition of stirring, the reaction kettle is opened and the temperature is rapidly raised to 300°C, and the stirring reaction is continued for 90 minutes to obtain the liquefied product of fruit tree waste branches. Add the liquefied product to a decolorizing column with a diameter of 10 cm and a length of 50 cm equipped with decolorizing agent B (decolorizing agent B is a mixture of mesoporous nano-chitosan, magnesium oxide and iron oxide in a weight ratio of 4:1:1 Uniform), after the liquefied product flows...

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Abstract

The invention discloses a light-cured coated controlled-release fertilizer and a preparation method thereof. The coated controlled-release fertilizer of the invention uses waste branches of fruit trees to be liquefied, decolorized and modified, and then a photocuring initiator is added as a coating material. It is coated on the surface of fertilizer granules, and then irradiated with ultraviolet light to cure it to form a dense film layer. The film-coated controlled-release fertilizer of the present invention has wide sources of film-coating materials, low price, low energy consumption, simple film-coating process, low cost, economical and environmental protection, and has good environmental, social and economic benefits.

Description

technical field [0001] The invention relates to the technical field of controlled-release fertilizer production, in particular to a light-cured coated controlled-release fertilizer and a preparation method thereof. Background technique [0002] Chemical fertilizers play a very important role in agricultural production and can effectively improve the yield and quality of food and cash crops. As the world's population continues to increase, human demand for food production is also increasing, and the amount of chemical fertilizers is also increasing. my country is a country with a large population in the world, and it is also a big consumer of chemical fertilizers. At present, the utilization rate of chemical fertilizers in our country is low, which will not only cause a lot of waste of fertilizer resources, but also lead to a series of environmental problems, resulting in deterioration of soil physical and chemical properties, pollution of groundwater and surface water, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/40C05G5/30C08B37/14C08H7/00
CPCY02P20/54
Inventor 杨越超高妮张淑刚
Owner SHANDONG AGRICULTURAL UNIVERSITY
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