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Pesticide microcapsule and preparation method thereof

A technology for microcapsules and pesticide preparations, which is applied in the field of pesticide microcapsules and their preparation, can solve the problems of adverse effects on mammals, poisoning of pesticides, environmental pollution, etc., and achieves the effects of increasing the encapsulation amount of pesticides and enriching the output.

Active Publication Date: 2014-01-29
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional dosage forms are often difficult to give full play to the activity of pesticides, and are toxic to applicators, and the use of organic solvents will cause environmental pollution and adverse effects on mammals

Method used

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  • Pesticide microcapsule and preparation method thereof
  • Pesticide microcapsule and preparation method thereof
  • Pesticide microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, preparation of natural kapok fiber tube and urea-formaldehyde resin composite encapsulated clethodim microcapsules

[0028] (1) Pre-treatment of natural microtubules

[0029] 1g of natural kapok fiber is chopped to 50-80μm by mechanical external force.

[0030] (2) Clethodim fills cut natural microtubules

[0031] Take 1 g of the microtubes cut short in step 1, disperse them in 10 mL of clethodim, soak them, and the kapok fiber tube is filled with clethodim due to capillary force.

[0032] (3) Encapsulation of kapok fiber tube

[0033] Directly add 2g of urea-formaldehyde prepolymer dropwise to the system in step 2 (obtained by adding 2ml of formaldehyde solution with a volume fraction of 36% and 1g of urea and stirring until completely dissolved, raising the temperature to 60°C and keeping it warm for 15min), raising the temperature of the system to 97 ~98°C, react for 1 hour. The urea-formaldehyde resin polymer is coated on the surface of the kapok f...

Embodiment 2

[0037] Embodiment 2, the preparation of natural kapok fiber tube and cellulose acetate composite encapsulated fluroxypyr EC (Shitalong) microcapsules

[0038] (1) Pre-treatment of natural microtubules

[0039] Cut 1g of natural kapok fiber to 100-150μm by mechanical force.

[0040] (2) Fluroxypyr EC filled with cut natural microtubules

[0041] Take 0.5 g of the short-cut microtubes in step 1 and disperse them in 10 mL of fluroxypyr EC, soak to balance the capillary absorption, and fill the kapok fiber tube with fluroxypyr EC.

[0042] (3) Encapsulation of kapok fiber tube

[0043] The kapok microtubes filled with fluroxypyr EC obtained in step (2) were immersed in 5 mL of cellulose acetate dichloromethane solution with a concentration of 5% (mass percentage), so that the kapok microtubes were covered with a layer of A cellulose acetate solution to obtain fluroxypyr emulsifiable concentrate microcapsules encapsulated by cellulose acetate and kapok fiber tubes.

[0044] (4)...

Embodiment 3

[0047] Example 3. Preparation of dimethacet microcapsules encapsulated in natural kapok fiber tube and encapsulated with polyacrylonitrile

[0048] (1) Pre-treatment of natural microtubules

[0049] 1g of natural kapok fiber is chopped to 800-900μm by mechanical external force.

[0050] (2) Dimethacet filled with cut natural microtubules

[0051] Take 0.2 g of the short-cut microtubes in step 1 and disperse them in 10 mL of dimethenamid, and soak to balance the capillary absorption, so that the kapok fiber tubes are filled with dimethacet.

[0052] (3) Encapsulation of kapok fiber tube

[0053] The kapok microtubes filled with dimethacet obtained in step (2) were immersed in 5 mL of polyacrylonitrile N, N'-dimethylformamide solution with a concentration of 5% (mass percentage content), so that The kapok microtubules are covered with a layer of polyacrylonitrile solution, and the dimethacet microcapsules encapsulated by kapok fiber microtubules and polyacrylonitrile are obta...

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Abstract

The invention discloses a pesticide microcapsule and a preparation method thereof. The pesticide microcapsule consists of a capsule core and a capsule wall; and the capsule core is pesticide and the capsule wall is a compound capsule wall which is formed by encapsulating natural fibers by high polymer materials. The preparation method comprises the following steps of: 1) dispersing natural fibers in liquid pesticide, and soaking to ensure that liquid pesticide is filled in microtubules of natural fibers; 2) and encapsulating the natural fibers in which pesticide is filled in the step 1) by using the high polymer materials to obtain the pesticide microcapsule. The cotton fibers which are adopted in the method have natural plant microtubules which have high hollowness, are environment-friendly, and low in price and can be obtained easily, and have the characteristics of high encapsulation capacity, low cost, sustained release and the like when used for the pesticide microcapsule.

Description

technical field [0001] The invention relates to a pesticide microcapsule and a preparation method thereof. Background technique [0002] The purpose of pesticide formulation processing is to maximize the active ingredients of pesticides. Traditional dosage forms are often difficult to give full play to the activity of pesticides, and are toxic to applicators, and the use of organic solvents will cause environmental pollution and adverse effects on mammals. Many problems force people to develop new alternative dosage forms. Pesticide microcapsules are a new type of pesticide formulation. Pesticide microcapsules use microcapsule technology to coat active substances such as solid and liquid pesticides in capsule wall materials to form microcapsules. Compared with conventional pesticides, since the active ingredients of pesticides are coated in a closed or semi-permeable wall membrane, the capsule wall can improve the rain resistance and light resistance of pesticides, greatl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/28A01N35/10A01N43/40A01N43/824A01N33/22A01N43/56A01N37/22A01P13/00B01J13/02B01J13/22
Inventor 段春婷龙宇华余晓兰张晓艳赵宁张小莉徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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