Pesticide microcapsule employing metal ion chelate of tannin as capsule wall and preparation method of pesticide microcapsule

A metal ion, metal ion solution technology, applied in the field of pesticides, to achieve the effect of safety for producers, help plant growth, and reduce the risk of direct contact with pesticides

Active Publication Date: 2015-03-04
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant literature and patent reports about the preparation of pesticide microcapsules by metal ion chelates of tannic acid

Method used

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  • Pesticide microcapsule employing metal ion chelate of tannin as capsule wall and preparation method of pesticide microcapsule
  • Pesticide microcapsule employing metal ion chelate of tannin as capsule wall and preparation method of pesticide microcapsule
  • Pesticide microcapsule employing metal ion chelate of tannin as capsule wall and preparation method of pesticide microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 10.00g of 96wt% chlorpyrifos in 10.00g of xylene to make an oil phase; dissolve 0.85g of alkylphenol ethoxylates, 1.50g of sodium lignosulfonate and 0.20g of gum arabic in 60.00g of deionized Make the water phase in water; add the oil phase to the water phase, emulsify at a high speed of 10,000 rpm for 30 seconds, then transfer the emulsion to a three-necked flask, stir at 200 rpm, and pass in nitrogen, at 40-45 Keep warm at ℃; slowly add 1.00g 5wt% ferric chloride solution dropwise (dropping speed 1-2d / s) at an interval of 5 minutes, then slowly drop (dropping speed 1-2d / s) 1.13g 14wt% ferric chloride solution Nitric acid (the structure diagram of the tannic acid used is shown in figure 1 Shown) solution, and then an interval of 5 minutes is a cycle, a total of 15 cycles; the obtained microcapsule crude product is centrifuged, washed 3 times with deionized water, and vacuum-dried to obtain the tannic acid-iron ion Chlorpyrifos microcapsules as wall material. ...

Embodiment 2

[0032] Dissolve 10.00g of 95% lambda-cyhalothrin in 10.00g of 150# solvent oil to make an oil phase; dissolve 0.65g of alkylphenol polyoxyethylene polyoxypropylene ether, 2.00g of NNO and 0.50g of polyvinyl alcohol Prepare the water phase in 45.00g of deionized water; add the oil phase to the water phase, emulsify at a high speed of 10,000 rpm for 30 seconds, then transfer the emulsion to a three-necked flask, stir at 200 rpm, and inject nitrogen , keep warm at 40-45°C; first slowly add (dropping speed 1-2d / s) 0.66g 5 wt % calcium chloride solution at an interval of 5 minutes, then slowly drop (dropping speed 1-2d / s) 1.00 g 10 wt % tannic acid solution, followed by another 5 minutes interval for one cycle, a total of 14 cycles; the obtained microcapsule crude product was centrifuged, washed 3 times with deionized water, and vacuum-dried to obtain tannin Beta-cyhalothrin microcapsules with acid-calcium ions as the wall material. The particle size of the pesticide microcapsules...

Embodiment 3

[0034] Dissolve 10.00g 95% pendimethalin original drug in 15.00g xylene to make oil phase; dissolve 0.45g castor oil ethylene oxide adduct, 2.40g calcium lignosulfonate and 0.20g gum arabic in 70.00g of deionized water to make the water phase; add the oil phase to the water phase, 10000 rpm high-speed homogeneous emulsification for 30 seconds, then transfer the emulsion to a three-necked flask, stir at 200 rpm, and feed nitrogen, Insulate at 40-45°C; slowly drop (dropping speed 1-2d / s) 1.00g of 4 wt% aluminum chloride solution at an interval of 5 minutes, then slowly drop (dropping speed 1-2d / s) 0.96g 16 wt % tannic acid solution, and another 5 minutes interval, which is a cycle, a total of 15 cycles; the obtained microcapsule crude product is centrifuged, washed 3 times with deionized water, and vacuum-dried to obtain tannic acid - pendimethalin microcapsules with aluminum ions as the wall material. The particle size of the pesticide microcapsules prepared in this example is...

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Abstract

The invention discloses a pesticide microcapsule employing metal ion chelate of tannin as a capsule wall and a preparation method of the pesticide microcapsule, and belongs to the technical field of pesticides. The pesticide microcapsule disclosed by the invention comprises a capsule core and a capsule wall, wherein the pesticide is arranged at the capsule core. The pesticide microcapsule is characterized in that the metal ion chelate of tannin is taken as the capsule wall. The thickness (the thickness of the capsule wall is easy to adjust) of the capsule wall is adjusted by adding different quantities of capsule wall materials according to requirements; a polymer which is formed by the tannin and metal ions after being complexed is relatively easy to degrade on the plant surface or in the soil; complete release of the capsule core can be ensured; waste of the pesticide is avoided; and the pesticide residue caused by too long residual life is avoided. In addition, trace metal ions can be absorbed and utilized by plants, so that plant growth is facilitated. Compared with commonly used in-situ polymerization method and interfacial polymerization method at present, the method disclosed by the invention is available in raw materials, and safe to a producer; and the pesticide microcapsule disclosed by the invention is easy to degrade in an environment, and does not cause new pollution.

Description

technical field [0001] The invention relates to the technical field of pesticides, in particular to a pesticide microcapsule with a metal ion chelate of tannic acid as a capsule wall and a preparation method thereof. Background technique [0002] Pesticides are used to control harmful organisms such as pests, mites, nematodes, pathogenic bacteria, weeds and rodents, and play a very important role in agricultural production. These dosage forms can be directly mixed with water and sprayed on plants. Their disadvantages are that the pesticide exposure to the pesticide workers is large, but it is very complicated to implement sufficient protection for the operators. In addition, due to the encapsulation of capsule wall materials, new characteristics of pesticides are endowed, so people pay more and more attention to pesticide microcapsules. Microcapsules refer to the use of natural or synthetic polymer materials to wrap the capsule core to form microcapsules with a particle siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/28A01N25/08A01N57/16A01N53/08A01N33/18A01N37/26A01P7/04
Inventor 刘峰慕卫张大侠李北兴
Owner SHANDONG AGRICULTURAL UNIVERSITY
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