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Preparation technology for pesticide microcapsule

A technology of microcapsules and pesticides, which is applied in the field of preparation of pesticide microcapsules, which can solve the problems of poor product slow release performance and decreased embedding rate of core materials, etc., and achieve the effect of simple capsule particle size distribution, simple mechanical strength, and easy manipulation

Inactive Publication Date: 2014-08-13
CHINESE ACADEMY OF AGRI SCI LANGFANG PESTICIDE PILOT PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Quality ratio control of wall material and core material: if the ratio of wall material and core material is too large, the wall film of microcapsules will be too thick, and the average particle size will be too small, resulting in poor slow release performance of the product; If the proportion of the core material is too small, the embedding rate of the core material will decrease

Method used

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  • Preparation technology for pesticide microcapsule
  • Preparation technology for pesticide microcapsule
  • Preparation technology for pesticide microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of 16% Avi·du microcapsule suspension

[0034]

[0035] The preparation method is as follows:

[0036] (1) 52.5g of urea, 80g of formaldehyde solution and 55g of melamine were stirred and mixed at a low speed, an appropriate amount of NaOH was added to adjust the pH value to 8, and the temperature was raised to 65°C until the melamine was completely dissolved, then stirred for 10 minutes to obtain cyanuric cyanide-urea - formaldehyde prepolymer.

[0037] (2) Dissolve 5g avermectin and 75g chlorpyrifos in 25g xylene, add 15g33# to 70g water to prepare an aqueous solution, mix the above materials, and stir rapidly for 20 minutes under a mixer at 1000r / min to obtain an oil-in-water milky white mixture liquid.

[0038] (3) Add melamine-urea-formaldehyde prepolymer into the obtained milky white mixture, and then adjust the rotating speed to 600r / min for stirring.

[0039] (4) Slowly drip 20ml of 5% dilute hydrochloric acid into (3) during the sti...

Embodiment 2

[0046] 2.6% emamectin benzoate · high chlorine microcapsule suspension

[0047]

[0048] The preparation method is as follows:

[0049] (1) 35g urea, 52.5g formaldehyde solution and 17.5g melamine are stirred and mixed at a low speed, add an appropriate amount of NaOH to adjust the pH value to 8, and increase the temperature to 65°C until the melamine is completely dissolved, then stir for 10 minutes to obtain melamine- Urea-formaldehyde prepolymer.

[0050] (2) Dissolve 10g avermectin and 3g beta-cypermethrin with 25g xylene, add 15Gel40 to 100g water to prepare an aqueous solution, mix the above materials, and stir rapidly for 20 minutes under a mixer at 1000r / min to obtain an oil-in-water milky white mixture liquid.

[0051] (3) Add melamine-urea-formaldehyde prepolymer into the obtained milky white mixture, and then adjust the rotating speed to 600r / min for stirring.

[0052] (4) Slowly drip 20ml of 5% dilute hydrochloric acid into (3) during the stirring process, and ...

Embodiment 3

[0059] 10% Kung fu permethrin microcapsule suspension

[0060] 2.6% emamectin benzoate · high chlorine microcapsule suspension

[0061]

[0062]

[0063] The preparation method is as follows:

[0064] (1) 47.5g urea, 70g formaldehyde solution and 47.5g melamine are stirred and mixed at a low speed, adding an appropriate amount of NaOH to adjust the pH value to 8, and raising the temperature to 65°C until the melamine is completely dissolved, stirring for 10 minutes to obtain melamine- Urea-formaldehyde prepolymer.

[0065] (2) Dissolve 50g kungfuthrin with 50g dimethylbenzene, add 15g14# to 100g water and be mixed with aqueous solution, above-mentioned material is mixed, stir rapidly 20 minutes under mixer 1000r / min, obtain the milky white mixed solution of oil-in-water.

[0066] (3) Add melamine-urea-formaldehyde prepolymer into the obtained milky white mixture, and then adjust the rotating speed to 600r / min for stirring.

[0067] (4) Slowly drip 20ml of 5% dilute hy...

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Abstract

The invention discloses a preparation technology for a pesticide microcapsule. According to the preparation technology for the pesticide microcapsule, by introducing a third monomer on the basis of a routine urea-formaldehyde condensation method, the thermal stability, the mechanical strength and the capsule size distribution of microcapsule particles are substantially improved. The preparation technology for the microcapsule is simpler and easier to operate compared with the routine urea-formaldehyde condensation technology in the industrial production process, the pesticide microcapsule suspending agent prepared by employing the technology completely accords with all national indexes, and the formaldehyde residual quantity is obviously lower than that of a microcapsule suspending agent prepared by employing a routine urea-formaldehyde condensation technology, and therefore the preparation technology helps to relatively well protect environment and is relatively friendly to environment.

Description

technical field [0001] The invention belongs to the technical field of pesticide preparation production and relates to a method for preparing pesticide microcapsules. Background technique [0002] Microcapsule suspension pesticide refers to a pesticide dosage form that uses natural or synthetic polymer materials to form a core-shell structure micro-container, encapsulates the pesticide, and suspends it in water. It includes two parts: the capsule wall and the capsule core. The capsule core is the active ingredient and solvent of the pesticide, and the capsule wall is the film-forming polymer material. This dosage form is divided into a continuous phase and a discontinuous phase, the continuous phase is water and additives, and the discontinuous phase is coated pesticide microcapsules. [0003] The technical difficulties of the microcapsule suspension preparation process are: (1) the control of temperature, pH value and stirring speed when the microcapsules are film-forming:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14A01N25/28A01N25/04
Inventor 陈昶张刚应徐军冯平章李琛
Owner CHINESE ACADEMY OF AGRI SCI LANGFANG PESTICIDE PILOT PLANT
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