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Water-dispersible leaf surface affiliative type nano pesticide slow releasing agent and preparation method thereof

A slow-release agent and pesticide technology, applied in the field of pesticides, can solve the problems of large free surface energy of particles, unstable kinetics, precipitation and agglomeration, etc., and achieve the effect of extending the duration of sustained release, reducing the amount of pesticides used, and solving aggregation and sedimentation.

Active Publication Date: 2015-12-16
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the water suspension system is between the colloidal dispersion system and the coarse dispersion system, and the free surface energy of the particles is large, so it is easy to aggregate and precipitate and agglomerate during storage and use.
In addition, the dynamics of the water suspension system is unstable, and the drug-loaded particles will settle freely under the action of gravity, resulting in stratification and precipitation of the system.

Method used

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  • Water-dispersible leaf surface affiliative type nano pesticide slow releasing agent and preparation method thereof
  • Water-dispersible leaf surface affiliative type nano pesticide slow releasing agent and preparation method thereof
  • Water-dispersible leaf surface affiliative type nano pesticide slow releasing agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1, preparation microcapsule type water-based suspending agent

[0049] Prepare the microcapsule type water-based suspension according to the following steps:

[0050] (1) Sodium hydroxide is dissolved in a mixed solvent of ethanol and water with a volume ratio of 1:50 to form a sodium hydroxide solution with a concentration of 80 mg / ml;

[0051] (2) Disperse the PLA (molecular weight of 100,000) microcapsules loaded with chlorantraniliprole in the loaded core into the sodium hydroxide solution prepared in step (1) to obtain a suspension with a mass concentration of 4 mg / ml;

[0052] (3) Shake the suspension prepared in step (2) at 100 r / min for 15 min. Finally, the suspension was centrifuged at 3000 r / min for 5 min to collect the product. The resulting product was washed 3 times with water and freeze-dried.

[0053] The scanning electron micrograph of the microcapsule prepared in this embodiment is as follows: figure 1 shown.

Embodiment 2

[0054] Embodiment 2, preparation microcapsule type water-based suspending agent

[0055] Prepare the microcapsule type water-based suspension according to the following steps:

[0056] (1) Sodium hydroxide is dissolved in a mixed solvent of ethanol and water with a volume ratio of 1:50 to form a sodium hydroxide solution with a concentration of 80 mg / ml;

[0057] (2) Dispersing the PLA (molecular weight of 100,000) microcapsules loaded with chlorantraniliprole on the inner core in the sodium hydroxide solution prepared in step (1) to obtain a suspension with a mass concentration of 4 mg / ml;

[0058] (3) Shake the suspension B prepared in step (2) at 100 r / min for 30 min. Finally, the suspension was centrifuged at 3000 r / min for 5 min to collect the product. The resulting product was washed 3 times with water and freeze-dried.

[0059] The scanning electron micrograph of the microcapsule prepared in this embodiment is as follows: figure 2 shown.

Embodiment 3

[0060] Embodiment 3, preparation microcapsule type water-based suspending agent

[0061] Prepare the microcapsule type water-based suspension according to the following steps:

[0062] (1) Sodium hydroxide is dissolved in a mixed solvent of ethanol and water with a volume ratio of 1:50 to form a sodium hydroxide solution with a concentration of 80 mg / ml;

[0063] (2) Disperse PLA (molecular weight: 100,000) microcapsules loaded with chlorantraniliprole on the inner core in the sodium hydroxide solution to obtain a suspension with a mass concentration of 4 mg / ml;

[0064] (3) Shake the suspension prepared in step (2) at 100 r / min for 45 min. Finally, the suspension was centrifuged at 3000 r / min for 5 min to collect the product. The resulting product was washed 3 times with water and freeze-dried.

[0065] The scanning electron micrograph of the microcapsule prepared in this embodiment is as follows: image 3 shown.

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Abstract

The invention discloses a water-dispersible leaf surface affiliative type nano pesticide slow releasing agent and a preparation method thereof. The preparation method of the pesticide slow releasing agent comprises the following steps: dispersing pesticide-loaded particles into a degradation agent solution; centrifuging after vibrating; and collecting solids to obtain the pesticide slow releasing agent. With the adoption a surface degradation treatment manner, the surfaces of the pesticide-loaded particles are grouped so that the charge repulsion effect between the particles is increased and the aggregation and sedimentation problem of particles in a suspension preparation is solved; hydrophilic groups on the surfaces of the pesticide-loaded particles subjected to degradation treatment also have the effect of a surfactant so that the surface tension of the water-dispersible slow releasing agent can be reduced and the enrichment of the water-dispersible slow releasing agent on leaf surfaces of crops is enhanced; and the loss of pesticides in a spraying process is reduced, and the target deposition efficiency, enrichment efficiency and dosage transferring efficiency are improved. Furthermore, surface appearances of the pesticide-loaded particles can be controlled through adjusting degradation time, so that the releasing of effective components in the pesticide slow releasing agent is controlled and the effective utilization rate of the pesticides is improved.

Description

technical field [0001] The invention relates to a water-dispersed leaf-surface-affinity nanopesticide slow-release agent and a preparation method thereof, belonging to the technical field of pesticides. Background technique [0002] Pesticides are an important means for humans to prevent and control agricultural and forestry diseases, insects, grasses, rodents and vector pests. However, the traditional formulations of pesticides have problems such as serious loss during use and large amount of organic solvents, which pose a serious threat to human health and the environment on which they depend. During use, the medicine is easy to gather and slide on the leaves of the crops, resulting in more than 90% of the medicine being scattered in the soil, air and water environment or remaining in the agricultural products. In addition, a large amount of organic solvents in the medicament will also enter the environment, which not only easily leads to environmental pollution, but also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/04A01N25/12A01N25/28A01N43/56A01N43/90A01N57/14A01N51/00A01P7/00
Inventor 吴德成刘宝霞
Owner INST OF CHEM CHINESE ACAD OF SCI
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