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Plant enzyme responsive controlled-release fertilizer and preparation method thereof, and plant enzyme responsive nano-carrier and preparation method thereof

A nano-carrier and responsive technology, applied in the field of agrochemicals, can solve the problems of being easily washed away by water, prolonging the fertilizer efficiency, and difficult to ensure the loading rate of fertilizers, so as to promote the development of technology and improve the absorption and utilization rate.

Active Publication Date: 2020-03-17
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of nanomaterials to adsorb, wrap and load traditional fertilizers is an effective way to manufacture new slow-release nano-fertilizers, which can effectively protect fertilizers from degradation caused by light, high temperature and microbial infection. At the same time, due to the adsorption of nanomaterials The loaded fertilizer can be released slowly, so as to achieve the effect of prolonging the fertilizer effect, but it is difficult to guarantee the fertilizer loading rate by simple adsorption, especially in the pretreatment process, it is easy to be washed away by water
In addition, the processing technology of nano-fertilizers, especially nano-slow and controlled-release fertilizers, is immature and stable, and the mode and mechanism of the controlled release of nano-slow and controlled-release fertilizers in crops are still unclear, which seriously restricts the further development of nano-slow and controlled-release fertilizers. development and widespread use

Method used

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  • Plant enzyme responsive controlled-release fertilizer and preparation method thereof, and plant enzyme responsive nano-carrier and preparation method thereof
  • Plant enzyme responsive controlled-release fertilizer and preparation method thereof, and plant enzyme responsive nano-carrier and preparation method thereof
  • Plant enzyme responsive controlled-release fertilizer and preparation method thereof, and plant enzyme responsive nano-carrier and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0042] As an embodiment of the present invention, the carboxymethyl polysaccharide is selected from at least one of carboxymethyl cellulose, carboxymethyl starch, sodium alginate, carboxymethyl chitosan, and carboxymethyl dextran .

[0043] As an embodiment of the present invention, the modifier is selected from at least one of epichlorohydrin, epibromopropane, chloropropene, and bromopropene.

[0044] The preparation method of the modified carboxymethyl polysaccharide is as follows:

[0045] S3 Dissolve 4-6g carboxymethyl polysaccharide in deionized water to obtain a carboxymethyl polysaccharide solution; add a certain mass ratio of modifier and acid, stir and heat to react for 24 hours, and then wash three times with absolute ethanol to precipitate The substance is the modified carboxymethyl polysaccharide, which is then dried and ground into powder, and stored in a desiccator for later use.

[0046] Wherein, the mass concentration of the carboxymethyl polysaccharide solution is 1 ...

Embodiment 1

[0075] S1. Aminated modification of halloysite nanotube surface

[0076] Disperse 2.5 g of halloysite nanotubes in a reactor containing 200 mL of toluene, then add 1.0 g of 3-aminopropyltrimethoxysilane, and heat to 80°C under the protection of nitrogen for reflux reaction for 24 hours. The substance is centrifuged, and the solid substance is washed with deionized water several times to obtain amino-modified halloysite nanotubes.

[0077] S2. Functionalized halloysite nanotubes loaded with fertilizer

[0078] Add 2.0 g of salicylic acid to 100 mL of ethyl acetate solution, then add 2.0 g of amino-functional halloysite nanotubes, sonicate for 30 minutes, then vacuum, and react for 24 hours under vacuum at room temperature. The reaction is complete After centrifugation, it was washed with deionized water and dried at 60°C.

[0079] S3. Graft modification of carboxymethyl polysaccharide

[0080] Dissolve 5 g of carboxymethyl cellulose in 400 mL of deionized water to obtain a carboxymethy...

Embodiment 2

[0086] The present invention provides a plant enzyme-responsive controlled-release fertilizer. The specific implementation is the same as that in Example 1, except that the toluene described in S1 is replaced with absolute ethanol. Replace 3-aminopropyltrimethoxysilane with 3-aminopropyltriethoxysilane. In the enzyme response experiment, 6.0 mL of 0.2% (wt%) cellulase aqueous solution was added.

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Abstract

The invention relates to the technical field of plant nutrition, in particular to a plant enzyme responsive controlled-release fertilizer and a preparation method thereof, and a plant enzyme responsive nano-carrier and a preparation method thereof. The carrier comprises modified carboxymethyl polysaccharide and an amino modified halloysite nanotube, and a nano-composite carrier with a core-shell structure is formed through esterification reaction. Plant nutrient substances (chemical fertilizers, trace elements and plant growth regulators) are loaded in the tube cavity of the nanotube in a negative pressure adsorption manner, and then the outer layer of the nanotube is coated with a layer of degradable modified carboxymethyl polysaccharide with good biocompatibility through chemical grafting, so that the stability of the fertilizer is improved. The nano-carrier can directly enter crop bodies through plant leaf surfaces, the outer-layer wall material of the nano-carrier is cracked through plant active enzymes in the bodies, so that mesopores or lumen ports in the surface of the nano-carrier are opened, and nutrient substances in lumens are released.

Description

Technical field [0001] The invention relates to the field of agrochemistry, and more particularly to a plant enzyme-responsive controlled-release fertilizer, a nano carrier and a preparation method thereof. Background technique [0002] Modern agricultural production largely relies on chemical fertilizers and pesticides to provide sufficient nutrients for crop growth, control various diseases and insect pests, and remove weeds to ensure healthy crop growth. However, the long-term large-scale application of agrochemical products has changed the soil structure, resulting in a significant reduction in the content of organic matter in the soil, resulting in the loss of farmland nutrients and the decline of soil fertility. Excessive application of chemical fertilizers brings many problems, mainly due to the low absorption and utilization rate of traditional agrochemical products by crops. [0003] In recent years, the rapid development of nanotechnology has provided new ideas for solvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40
CPCC05D9/00C05G3/00C05F11/00
Inventor 王超李普旺杨子明谢江辉孔令学吕明哲刘运浩周闯何祖宇李永振
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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