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Pesticide microcapsule suspension and processing method thereof

A technology of microcapsule suspension and processing method, which is applied in the direction of botany equipment and methods, chemicals for biological control, biocides, etc., can solve the problems of difficult degradation of polyurethane wall materials and environmental pollution, and achieve the reduction of human body and environment. harm, high coverage rate, wide range of applicable objects

Inactive Publication Date: 2018-02-16
SINOCHEM YUNLONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a processing method of pesticide microcapsule suspension, which is prepared by interfacial polymerization, with highly cross-linked polyurethane as the wall material; at the same time, low-toxicity ethyl acetate is used as organic solvent to dissolve the pesticide , which reduces the harm to relevant personnel, and most importantly, through the special molecular structure design, the polyurethane wall material can be gradually degraded under natural conditions, which solves the problem that the existing polyurethane wall material is difficult to degrade and seriously pollutes the environment

Method used

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  • Pesticide microcapsule suspension and processing method thereof

Examples

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Effect test

Embodiment 1

[0039] Stir and react 100 parts of diphenylmethane diisocyanate, 20 parts of hydroxyethyl acrylate and 200 parts of polycaprolactone diol at 90°C for 1 hour, then add 2000 parts of ethyl acetate to form a solution. 100 parts of abamectin are dissolved in the above-mentioned ethyl acetate solution to obtain an oil phase. 160 parts of Tween, 40 parts of Span, 12 parts of glycerol, 0.2 part of N,N'-methylenebisacrylamide and 0.08 part of potassium persulfate were dissolved in 5000 parts of water to obtain an aqueous phase. Add the oil phase to the water phase, and stir and emulsify at 50°C for 1 minute at high speed to obtain an emulsion. The emulsion was stirred and reacted at 70° C. for 0.1 hour to obtain abamectin microcapsule suspension.

[0040] In this example, the pesticide coverage rate of the microcapsules was 82.0%, and the degradation time of the polyurethane wall material was 173 days.

Embodiment 2

[0042] 80 parts of toluene diisocyanate, 50 parts of hydroxyethyl acrylate and 220 parts of polybutylene adipate diol were stirred and reacted at 50°C for 10 hours, and then 1800 parts of ethyl acetate were added to form a solution. 100 parts of malathion were dissolved in the above ethyl acetate solution to obtain an oily phase. Dissolve 160 parts of nonylphenol ethoxylates, 20 parts of fatty alcohol ethoxylates, 15 parts of diethylenetriamine, 0.5 parts of N,N'-methylenebisacrylamide and 0.12 parts of potassium persulfate in 4000 parts The aqueous phase was obtained in water. Add the oil phase to the water phase, and emulsify with high-speed stirring at 20°C for 120 minutes to obtain an emulsion. The emulsion was stirred and reacted at 20° C. for 10 hours to obtain malathion microcapsule suspension.

[0043] In this example, the pesticide coating rate of the microcapsules was 84.2%, and the degradation time of the polyurethane wall material was 61 days.

Embodiment 3

[0045] 100 parts of isophorone diisocyanate, 2 parts of hydroxyethyl acrylate and 400 parts of polytetrahydrofuran ether glycol were stirred and reacted at 90°C for 4 hours, and then 1000 parts of ethyl acetate was added to form a solution. 85 parts of phoxim were dissolved in the above ethyl acetate solution to obtain an oily phase. 300 parts of fatty alcohol polyoxyethylene ether, 30 parts of pentaerythritol, 0.1 part of N,N'-methylenebisacrylamide and 0.05 part of potassium persulfate were dissolved in 1800 parts of water to obtain an aqueous phase. Add the oil phase to the water phase, and emulsify with high-speed stirring at 35°C for 15 minutes to obtain an emulsion. The emulsion was stirred and reacted at 65° C. for 6.5 hours to obtain a suspension of phoxim microcapsules.

[0046] In this embodiment, the pesticide coating rate of the microcapsules is 92.7%, and the degradation time of the polyurethane wall material is 272 days.

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Abstract

The invention discloses a pesticide microcapsule suspension and a processing method thereof. The processing method comprises the following steps: mixing diisocyanate, hydroxyethyl acrylate and dihydric alcohol, performing reaction, then adding ethyl acetate and a pesticide, and performing uniform mixing to obtain an oil phase; adding polyalcohol or polyamine and an emulsifier into water, and performing uniform mixing to obtain a water phase; mixing the oil phase with the water phase and performing emulsification and reaction to obtain the pesticide microcapsule suspension. The pesticide microcapsule suspension liquid has a wide application range, and can be used for microencapsulation of most common pesticides; the highly cross-linked polyurethane synthesized by adopting an interfacial polymerization method is used as a wall material, so that the influence of external environmental factors on the capsule core pesticide is greatly reduced; through the design of the special molecular structure, the polyurethane wall material can be gradually degraded under the natural condition, so that the pollution to the soil and the environment is reduced; and in the pesticide microcapsule, low-toxicity ethyl acetate is used as the organic solvent to dissolve the pesticide for forming the oil phase, so that the damage to human body and the environment in the production and use processes is greatly reduced.

Description

technical field [0001] The invention relates to the field of slow-release pesticides, in particular to a processing method for pesticide microcapsule suspensions. Background technique [0002] Pesticide microcapsules refer to microcapsules formed by encapsulating the capsule core containing pesticides with a certain solid material as the capsule wall by chemical, physical or physicochemical methods; at the same time, they are dispersed with the help of suspension stabilizers and emulsifiers. , suspended in the continuous phase liquid, thereby obtaining the pesticide microcapsule suspension. The capsule wall of the microcapsule isolates the capsule core from the outside world, and under proper conditions, the pesticide in the capsule core is released as the wall material is destroyed. If the selected wall material is semi-permeable, the pesticide will be released into the external environment through the capsule wall through processes such as dissolution, diffusion, and pene...

Claims

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Application Information

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IPC IPC(8): A01N25/04A01N43/90A01N57/12A01N57/14A01N57/16A01N51/00A01N41/08A01N47/18A01N41/04A01P3/00A01P7/04C08G18/42C08G18/44C08G18/48C08G18/66C08G18/67C08G18/75C08G18/76C08J3/24
CPCA01N25/04A01N41/04A01N41/08A01N43/90A01N47/18A01N51/00A01N57/12A01N57/14A01N57/16C08G18/4238C08G18/4277C08G18/44C08G18/4854C08G18/6644C08G18/6651C08G18/6677C08G18/672C08G18/755C08G18/7614C08G18/7671C08J3/24C08J2375/04C08J2375/06C08J2375/08
Inventor 肖尧盛勇沙桐许立
Owner SINOCHEM YUNLONG
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